Researchers Database

HIRENZAKI Satoru

FacultyFaculty Division of Natural Sciences Research Group of Physics
PositionProfessor
Last Updated :2022/10/06

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Profile and Settings

  • Name (Japanese)

    Hirenzaki
  • Name (Kana)

    Satoru

Research Interests

  • 中間子原子核
  • 中間子原子
  • 有限密度におけるハドロンの性質と対称性
  • ハドロン物理
  • 原子核物理
  • Mesic Nuclei
  • Mesic Atom
  • Hadron properties at finite density and symmetry
  • Hadron Physics
  • Nuclear Physics

Research Areas

  • Natural sciences, Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics

Education

  • Apr. 1988, Mar. 1991, 東京都立大学, 理学研究科博士課程, 物理学専攻, Japan
  • Apr. 1986, Mar. 1988, Tokyo Metropolitan University, Graduate School, Division of Natural Science (Doctor course), Physics
  • Apr. 1982, Mar. 1986, Tokyo University of Science, 理学部, 物理学科, Japan

Association Memberships

  • 日本応用数理学会
  • 日本物理学会

Ⅱ.研究活動実績

Published Papers

  • Refereed, Progress of Theoretical and Experimental Physics, Oxford University Press (OUP), Structure of double pionic atoms, Akari Tani; Natsumi Ikeno; Daisuke Jido; Hideko Nagahiro; Hiroyuki Fujioka; Kenta Itahashi; Satoru Hirenzaki, Abstract We study theoretically the structure of double pionic atoms, in which two negatively charged pions ($\pi^-$) are bound in the atomic orbits. The double pionic atom is considered to be an interesting system from the point of view of the multi-bosonic systems. In addition, it could be possible to deduce valuable information on the isospin $I = 2$$\pi\pi$ interaction and the pion–nucleus strong interaction. In this paper, we take into account the $\pi\pi$ strong and electromagnetic interactions, and evaluate the effects on the binding energies by perturbation theory for the double pionic atoms in heavy nuclei. We investigate several combinations of two pionic states and find that the order of magnitude of the energy shifts due to the $\pi\pi$ interaction is around 10 keV for the strong interaction and around 100 keV for the electromagnetic interaction for the ground states., 15 Mar. 2021, 2021, 3, Scientific journal
  • Refereed, Progress of Theoretical and Experimental Physics, Oxford University Press (OUP), An event excess observed in the deeply bound region of the 12C (K−, p) missing-mass spectrum, Yudai Ichikawa; Junko Yamagata-Sekihara; Jung Keun Ahn; Yuya Akazawa; Kanae Aoki; Elena Botta; Hiroyuki Ekawa; Petr Evtoukhovitch; Alessandro Feliciello; Manami Fujita; Toshiyuki Gogami; Shoichi Hasegawa; Tomoyuki Hasegawa; Shuhei Hayakawa; Tomonori Hayakawa; Satoru Hirenzaki; Ryotaro Honda; Kenji Hosomi; Ken’ichi Imai; Wooseung Jung; Shunsuke Kanatsuki; Shin Hyung Kim; Shinji Kinbara; Kazuya Kobayashi; Jaeyong Lee; Simonetta Marcello; Koji Miwa; Taejin Moon; Tomofumi Nagae; Yoshiyuki Nakada; Manami Nakagawa; Takuya Nanamura; Megumi Naruki; Atsushi Sakaguchi; Hiroyuki Sako; Susumu Sato; Yuki Sasaki; Kotaro Shirotori; Hitoshi Sugimura; Toshiyuki Takahashi; Hirokazu Tamura; Kiyoshi Tanida; Zviadi Tsamalaidze; Mifuyu Ukai; Takeshi O Yamamoto, Abstract We have measured, for the first time, the inclusive missing-mass spectrum of the $^{12}$C$(K^-, p)$ reaction at an incident kaon momentum of 1.8 GeV/$c$ at the J-PARC K1.8 beamline. We observed a prominent quasi-elastic peak ($K^-p \rightarrow K^-p$) in this spectrum. In the quasi-elastic peak region, the effect of secondary interaction is apparently observed as a peak shift, and the peak exhibits a tail in the bound region. We compared the spectrum with a theoretical calculation based on the Green’s function method by assuming different values of the parameters for the $\bar{K}$–nucleus optical potential. We found that the spectrum shape in the binding-energy region $-300 \, \text{MeV} < B_{K} < 40$ MeV is best reproduced with the potential depths $V_0 = -80$ MeV (real part) and $W_0 = -40$ MeV (imaginary part). On the other hand, we observed a significant event excess in the deeply bound region around $B_{K} \sim 100$ MeV, where the major decay channel of $K^- NN \to \pi\Sigma N$ is energetically closed, and the non-mesonic decay modes ($K^- NN \to \Lambda N$ and $\Sigma N$) should mainly contribute. The enhancement is fitted well by a Breit–Wigner function with a kaon-binding energy of 90 MeV and width 100 MeV. A possible interpretation is a deeply bound state of a $Y^{*}$-nucleus system., 15 Dec. 2020, 2020, 12, Scientific journal
  • Refereed, Physical Review C, American Physical Society (APS), Search for the η mesic He3 in the pd→dpπ0 reaction with the WASA-at-COSY facility, P. Adlarson; W. Augustyniak; M. Bashkanov; S. D. Bass; F. S. Bergmann; M. Berłowski; A. Bondar; M. Büscher; H. Calén; I. Ciepał; H. Clement; E. Czerwiński; K. Demmich; R. Engels; A. Erven; W. Erven; W. Eyrich; P. Fedorets; K. Föhl; K. Fransson; F. Goldenbaum; A. Goswami; K. Grigoryev; L. Heijkenskjöld; V. Hejny; N. Hüsken; S. Hirenzaki; T. Johansson; B. Kamys; N. G. Kelkar; G. Kemmerling; A. Khoukaz; A. Khreptak; D. A. Kirillov; S. Kistryn; H. Kleines; B. Kłos; W. Krzemień; P. Kulessa; A. Kupść; K. Lalwani; D. Lersch; B. Lorentz; A. Magiera; R. Maier; P. Marciniewski; B. Mariański; H.-P. Morsch; P. Moskal; H. Ohm; W. Parol; E. Perez del Rio; N. M. Piskunov; D. Prasuhn; D. Pszczel; K. Pysz; J. Ritman; A. Roy; O. Rundel; S. Sawant; S. Schadmand; T. Sefzick; V. Serdyuk; B. Shwartz; T. Skorodko; M. Skurzok; J. Smyrski; V. Sopov; R. Stassen; J. Stepaniak; E. Stephan; G. Sterzenbach; H. Stockhorst; H. Ströher; A. Szczurek; M. Wolke; A. Wrońska; P. Wüstner; A. Yamamoto; J. Zabierowski; M. J. Zieliński; J. Złomańczuk; M. Żurek, 20 Oct. 2020, 102, 4, Scientific journal
  • Refereed, Physics Letters B, Elsevier BV, Search for η mesic 3He with the WASA-at-COSY facility in the pd→3He2γ and pd→3He6γ reactions, P. Adlarson; W. Augustyniak; W. Bardan; M. Bashkanov; S.D. Bass; M. Berłowski; A. Bondar; M. Büscher; H. Calén; I. Ciepał; H. Clement; E. Czerwiński; R. Engels; A. Erven; W. Erven; W. Eyrich; P. Fedorets; K. Föhl; K. Fransson; F. Goldenbaum; A. Goswami; K. Grigoryev; L. Heijkenskjöld; V. Hejny; S. Hirenzaki; L. Jarczyk; T. Johansson; B. Kamys; N.G. Kelkar; G. Kemmerling; A. Khreptak; D.A. Kirillov; S. Kistryn; H. Kleines; B. Kłos; W. Krzemień; P. Kulessa; A. Kupść; K. Lalwani; D. Lersch; B. Lorentz; A. Magiera; R. Maier; P. Marciniewski; B. Mariański; H.-P. Morsch; P. Moskal; H. Ohm; W. Parol; E. Perez del Rio; N.M. Piskunov; D. Prasuhn; D. Pszczel; K. Pysz; J. Ritman; A. Roy; O. Rundel; S. Sawant; S. Schadmand; I. Schätti–Ozerianska; T. Sefzick; V. Serdyuk; B. Shwartz; T. Skorodko; M. Skurzok; J. Smyrski; V. Sopov; R. Stassen; J. Stepaniak; E. Stephan; G. Sterzenbach; H. Stockhorst; H. Ströher; A. Szczurek; A. Trzciński; M. Wolke; A. Wrońska; P. Wüstner; A. Yamamoto; J. Zabierowski; M.J. Zieliński; J. Złomańczuk; P. Żuprański; M. Żurek, Mar. 2020, 802, 135205, 135205, Scientific journal
  • Refereed, Nuclear Physics A, Elsevier BV, Non-mesonic decay of the η-mesic 3He via pd→(3He-η)bound→ 3He2γ(6γ) reaction, M. Skurzok; S. Hirenzaki; S. Kinutani; H. Konishi; P. Moskal; H. Nagahiro; O. Rundel, Jan. 2020, 993, 121647, 121647, Scientific journal
  • Refereed, Progress of Theoretical and Experimental Physics, Oxford University Press (OUP), Structure of $\eta^{\prime}$ mesonic nuclei in a relativistic mean field theory, Daisuke Jido; Hanayo Masutani; Satoru Hirenzaki, © 2019 The Author(s). The structure and the energy spectrum of the η′ mesonic nuclei are investigated in a relativistic mean field theory. One expects a substantial attraction for the η′ meson in finite nuclei due to the partial restoration of chiral symmetry in the nuclear medium. Such a hadronic scale interaction for the η′ mesonic nuclei may provide modification of the nuclear structure. The relativistic mean field theory is a self-contained model for finite nuclei that provides the saturation property within the model, and is useful for investigating the structure change of the nucleus induced by the η′ meson. Using the local density approximation for the mean fields, we solve the equations of motion for the nucleons and the η′ meson self-consistently, and obtain the nuclear density distribution and the η′ energy spectrum for the η′ mesonic nuclei. We take 12C, 16O, and 40 Ca as target nuclei. We find several bound states of the η′ meson for these nuclei thanks to the attraction for η′ in nuclei. We also find a sufficient change of the nuclear structure especially for the 1s bound state of η′. This implies that the production of the 1s bound state in nuclear reactions may be suppressed., 01 May 2019, 2019, 5, Scientific journal
  • Refereed, Physics Letters B, Elsevier BV, Constraining the optical potential in the search for η-mesic 4He, M. Skurzok; P. Moskal; N.G. Kelkar; S. Hirenzaki; H. Nagahiro; N. Ikeno, Jul. 2018, 782, 6, 12, Scientific journal
  • Refereed, Physical Review Letters, American Physical Society (APS), Spectroscopy of Pionic Atoms in Sn122(d,He3) Reaction and Angular Dependence of the Formation Cross Sections, T. Nishi; K. Itahashi; G. P. A. Berg; H. Fujioka; N. Fukuda; N. Fukunishi; H. Geissel; R. S. Hayano; S. Hirenzaki; K. Ichikawa; N. Ikeno; N. Inabe; S. Itoh; M. Iwasaki; D. Kameda; S. Kawase; T. Kubo; K. Kusaka; H. Matsubara; S. Michimasa; K. Miki; G. Mishima; H. Miya; H. Nagahiro; M. Nakamura; S. Noji; K. Okochi; S. Ota; N. Sakamoto; K. Suzuki; H. Takeda; Y. K. Tanaka; K. Todoroki; K. Tsukada; T. Uesaka; Y. N. Watanabe; H. Weick; H. Yamakami; K. Yoshida, We observed the atomic 1s and 2p states of π- bound to Sn121 nuclei as distinct peak structures in the missing mass spectra of the Sn122(d,He3) nuclear reaction. A very intense deuteron beam and a spectrometer with a large angular acceptance let us achieve a potential of discovery, which includes the capability of determining the angle-dependent cross sections with high statistics. The 2p state in a Sn nucleus was observed for the first time. The binding energies and widths of the pionic states are determined and found to be consistent with previous experimental results of other Sn isotopes. The spectrum is measured at finite reaction angles for the first time. The formation cross sections at the reaction angles between 0° and 2° are determined. The observed reaction-angle dependence of each state is reproduced by theoretical calculations. However, the quantitative comparison with our high-precision data reveals a significant discrepancy between the measured and calculated formation cross sections of the pionic 1s state., 13 Apr. 2018, 120, 15, Scientific journal
  • Refereed, Physical Review C, American Physical Society (APS), Missing-mass spectroscopy of the C12(p,d) reaction near the η′-meson production threshold, Y. K. Tanaka; K. Itahashi; H. Fujioka; Y. Ayyad; J. Benlliure; K.-T. Brinkmann; S. Friedrich; H. Geissel; J. Gellanki; C. Guo; E. Gutz; E. Haettner; M. N. Harakeh; R. S. Hayano; Y. Higashi; S. Hirenzaki; C. Hornung; Y. Igarashi; N. Ikeno; M. Iwasaki; D. Jido; N. Kalantar-Nayestanaki; R. Kanungo; R. Knöbel; N. Kurz; V. Metag; I. Mukha; T. Nagae; H. Nagahiro; M. Nanova; T. Nishi; H. J. Ong; S. Pietri; A. Prochazka; C. Rappold; M. P. Reiter; J. L. Rodríguez-Sánchez; C. Scheidenberger; H. Simon; B. Sitar; P. Strmen; B. Sun; K. Suzuki; I. Szarka; M. Takechi; I. Tanihata; S. Terashima; Y. N. Watanabe; H. Weick; E. Widmann; J. S. Winfield; X. Xu; H. Yamakami; J. Zhao, Excitation-energy spectra of C11 nuclei near the η′-meson production threshold have been measured by missing-mass spectroscopy using the C12(p,d) reaction. A carbon target has been irradiated with a 2.5 GeV proton beam supplied by the synchrotron SIS-18 at GSI to produce η′-meson bound states in C11 nuclei. Deuterons emitted at 0 in the reaction have been momentum analyzed by the fragment separator (FRS), used as a high-resolution spectrometer. No distinct structure due to the formation of η′-mesic states is observed although a high statistical sensitivity is achieved in the experimental spectra. Upper limits on the formation cross sections of η′-mesic states are determined, and thereby a constraint imposed on the η′-nucleus interaction is discussed., 12 Jan. 2018, 97, 1, Scientific journal
  • Refereed, European Physical Journal A, SPRINGER, η -nucleus interaction from the d + d reaction around the η production threshold, N. Ikeno; H. Nagahiro; D. Jido; S. Hirenzaki, © 2017, SIF, Springer-Verlag GmbH Germany. The η mesic nucleus is considered to be one of the interesting exotic many-body systems and has been studied since the 1980s theoretically and experimentally. Recently, the formation of the η mesic nucleus in the fusion reactions of the light nuclei such as d+ d→ (η+ α) → X has been proposed and the experiments have been performed by WASA-at-COSY. We develop a theoretical model to evaluate the formation rate of the η mesic nucleus in the fusion reactions and show the calculated results. We find that the η bound states could be observed in the reactions in cases with the strong attractive and small absorptive η-nucleus interactions. We compare our results with existing data of the d+ d→ η+ α and the d+ d→ 3He+ N+ π reactions. We find that the analyses by our theoretical model with the existing data can provide new information on the η-nucleus interaction., 01 Oct. 2017, 53, 10, 194, Scientific journal
  • Refereed, Physical Review Letters, American Physical Society (APS), Measurement of Excitation Spectra in the C12(p,d) Reaction near the η′ Emission Threshold, Y. K. Tanaka; K. Itahashi; H. Fujioka; Y. Ayyad; J. Benlliure; K.-T. Brinkmann; S. Friedrich; H. Geissel; J. Gellanki; C. Guo; E. Gutz; E. Haettner; M. N. Harakeh; R. S. Hayano; Y. Higashi; S. Hirenzaki; C. Hornung; Y. Igarashi; N. Ikeno; M. Iwasaki; D. Jido; N. Kalantar-Nayestanaki; R. Kanungo; R. Knöbel; N. Kurz; V. Metag; I. Mukha; T. Nagae; H. Nagahiro; M. Nanova; T. Nishi; H. J. Ong; S. Pietri; A. Prochazka; C. Rappold; M. P. Reiter; J. L. Rodríguez-Sánchez; C. Scheidenberger; H. Simon; B. Sitar; P. Strmen; B. Sun; K. Suzuki; I. Szarka; M. Takechi; I. Tanihata; S. Terashima; Y. N. Watanabe; H. Weick; E. Widmann; J. S. Winfield; X. Xu; H. Yamakami; J. Zhao, 08 Nov. 2016, 117, 20, Scientific journal
  • Refereed, Progress of Theoretical and Experimental Physics, Oxford University Press (OUP), First application of superconducting transition-edge sensor microcalorimeters to hadronic atom X-ray spectroscopy, S. Okada; D. A. Bennett; C. Curceanu; W. B. Doriese; J. W. Fowler; J. D. Gard; F. P. Gustafsson; T. Hashimoto; R. S. Hayano; S. Hirenzaki; J. P. Hays-Wehle; G. C. Hilton; N. Ikeno; M. Iliescu; S. Ishimoto; K. Itahashi; M. Iwasaki; T. Koike; K. Kuwabara; Y. Ma; J. Marton; H. Noda; G. C. O’Neil; H. Outa; C. D. Reintsema; M. Sato; D. R. Schmidt; H. Shi; K. Suzuki; T. Suzuki; D. S. Swetz; H. Tatsuno; J. Uhlig; J. N. Ullom; E. Widmann; S.Yamada; J.Yamagata-Sekihara; J. Zmeskal, Sep. 2016, 2016, 9, 091D01, 091D01, Scientific journal
  • Refereed, The European Physical Journal A, Springer Science and Business Media LLC, Formation of $\eta{^\prime}$ (958) meson bound states by the 6Li( $\gamma$ ,d) reaction, M. Miyatani; N. Ikeno; H. Nagahiro; S. Hirenzaki, Jul. 2016, 52, 7, Scientific journal
  • Refereed, PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS, OXFORD UNIV PRESS INC, Formation spectra of pionic atoms in the Green's function method, Natsumi Ikeno; Junko Yamagata-Sekihara; Hideko Nagahiro; Satoru Hirenzaki, We study the formation spectra of deeply bound pionic atoms in the (d, He-3) reactions using the Green's function method, stimulated by recent developments in experimental techniques. The Green's function method is considered to be a better theoretical formalism than the effective number approach to evaluate the formation rate of unstable systems. We compare the calculated results by the Green's function method with those by the effective number approach in various cases. We find that the differences between the results obtained by both methods are reasonably small and we can reaffirm that the effective number approach is a good theoretical method for the analyses of the previous experimental data with typical binding-energy errors of Delta B. E. greater than or similar to 20 keV for the deeply bound pionic atoms. On the other hand, we think that theoretical results using the Green's function method will be necessary in the near future to deduce precise information on the pion properties in nuclei from analyses of the pionic atom data with better accuracy than before., Mar. 2015, 2015, 3, (13 pages), Scientific journal
  • Refereed, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, ELSEVIER SCIENCE BV, Experimental constraints on the ω-nucleus real potential, S. Friedrich; K. Makonyi; V. Metag; D. Bayadilov; B. Bantes; R. Beck; Y. A. Beloglazov; S. Böse; K. T. Brinkmann; Th Challand; V. Crede; T. Dahlke; F. Dietz; P. Drexler; H. Eberhardt; D. Elsner; R. Ewald; K. Fornet-Ponse; F. Frommberger; Ch Funke; M. Gottschall; A. Gridnev; M. Grüner; E. Gutz; Ch Hammann; D. Hammann; J. Hannappel; J. Hartmann; W. Hillert; S. Hirenzaki; P. Hoffmeister; Ch Honisch; I. Jaegle; D. Kaiser; H. Kalinowsky; S. Kammer; I. I.Keshelashvili; V. Kleber; F. Klein; B. Krusche; M. Lang; I. V. Lopatin; Y. Maghrbi; M. Nanova; H. Nagahiro; J. Müller; T. Odenthal; D. Piontek; T. Rostomyan; S. chaepe; Ch Schmidt; H. Schmieden; R. Schmitz; T. Seifen; A. Thiel; U. Thoma; H. vanPee; D. Walther; J. Weil; Ch Wendel; U. Wiedner; A. Wilson; A. Winnebeck; F. Zenke, In a search for ω mesic states, the production of ω-mesons in coincidence with forward going protons has been studied in photon induced reactions on 12C for incident photon energies of 1250-3100 MeV. The π0γ pairs from decays of bound or quasi-free ω-mesons have been measured with the CBELSA/TAPS detector system in coincidence with protons registered in the MiniTAPS forward array. Structures in the total energy distribution of the π0γ pairs, which would indicate the population and decay of bound ω 11B states, are not observed. The π0γ cross section of 0.3 nb MeV-1 sr-1 observed in the bound state energy regime between -100 and 0 MeV may be accounted for by yield leaking into the bound state regime because of the large in-medium width of the ω-meson. A comparison of the measured total energy distribution with calculations suggests the real part V0 of the ω 11B potential to be small and only weakly attractive with V0(ρ = ρ0) = - 15 ± 35(stat) ± 20(syst) MeV in contrast to some theoretical predictions of attractive potentials with a depth of 100-150 MeV. © 2014 Elsevier B.V., 07 Sep. 2014, 736, 26, 32, Scientific journal
  • Refereed, PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS, OXFORD UNIV PRESS INC, (d,He-3) reaction on an odd-neutron nuclear target for the formation of deeply bound pionic atoms, Natsumi Ikeno; Junko Yamagata-Sekihara; Hideko Nagahiro; Satoru Hirenzaki, We consider pionic atom spectroscopy by the (d,He-3) reaction on an odd-neutron nuclear target in this article, which has not yet been investigated. In the (d,He-3) reaction on the odd-neutron nuclear target, we can observe pionic states in the even-neutron nucleus with spin-parity 0(+). We expect that these pionic states do not have additional shifts due to the effects of the residual interaction between neutron-hole and pionic states. For the even-neutron nuclear target cases, we may have to take into account the residual interaction effects to deduce the binding energies of the pionic states precisely from the high-precision experimental data, since the final pionic states are pion-particle plus neutron-hole [pi circle times n(-1)] states. Thus, in addition to widening the domain of pionic atom spectroscopy on the nuclear chart, the present study of the (d,He-3) reaction on an odd-neutron target is considered to be important to deduce extremely precise information on the binding energies of the observed pionic states, and to clarify the pion properties and aspects of the symmetries of the strong interaction at finite density. We modify the formula of the even-even nuclear target case to study pionic atom formation spectra on the even-odd nuclear target and show the numerical results of the Sn-117 target case. This experiment will be performed at RIBF/RIKEN in the near future., Jun. 2013, 2013, 6, 1, 15age, Scientific journal
  • Refereed, PHYSICAL REVIEW C, AMER PHYSICAL SOC, Formation of eta '(958)-mesic nuclei by the (p,d) reaction, Hideko Nagahiro; Daisuke Jido; Hiroyuki Fujioka; Kenta Itahashi; Satoru Hirenzaki, We calculate theoretically the formation spectra of. n' (958)-nucleus systems in the (p,d) reaction for the investigation of in-medium modification of the. n' mass. We show comprehensive numerical calculations based on a simple form of the. n' optical potential in nuclei with various potential depths. We conclude that one finds evidence of a possible attractive interaction between. n' and the nucleus as a peak structure appearing around the. n' threshold in light nuclei such as C-11, when the attractive potential is stronger than 100 MeV and the absorption width is of order 40 MeV or less. Spectroscopy of the (p, d) reaction is expected to be performed experimentally at existing facilities, such as GSI. We also estimate the contributions from the omega and phi mesons, which have masses close to the. n' meson, concluding that the observation of the peak structure of the. n' -mesic nuclei is not disturbed, although their contributions may not be small., Apr. 2013, 87, 4, 045201 1-8, Scientific journal
  • Not Refereed, PROGRESS OF THEORETICAL PHYSICS, PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE, Feasibility Study of Observing eta ' Mesic Nuclei with (p, d) Reaction, Kenta Itahashi; Hiroyuki Fujioka; Hans Geissel; Ryugo S. Hayano; Satoru Hirenzaki; Satoshi Itoh; Daisuke Jido; Volker Metag; Hideko Nagahiro; Mariana Nanova; Takahiro Nishi; Kota Okochi; Haruhiko Outa; Ken Suzuki; Yoshiki K. Tanaka; Helmut Weick, A novel method is proposed to measure eta' (958) meson bound states in C-11 nuclei by missing mass spectroscopy of the C-12(p, d) reaction near the eta' production threshold. It is shown that peak structures will be observed experimentally in an inclusive measurement in case that the in-medium eta' mass reduction is sufficiently large and that the decay width of eta' mesic states is narrow enough. Such a measurement will be feasible with the intense proton beam supplied by the SIS synchrotron at GSI combined with the good energy resolution of the fragment separator FRS., Sep. 2012, 128, 3, 601, 613, Scientific journal
  • Not Refereed, PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, ELSEVIER, Deeply bound pionic states in heavy nuclei, Toshimitsu Yamazaki; Satoru Hirenzaki; Ryugo S. Hayano; Hiroshi Toki, The present paper reviews theoretical and experimental studies of a new type of nuclear spectroscopy for the structure of deeply bound pi(-) states and their formation processes through "pion-transfer" nuclear reactions. The calculated energy levels of deeply bound pionic states in heavy nuclei using the standard pion-nucleus optical potential are found to be narrow discrete states even for the 1s state in Pb-208. These hitherto unexpected results are caused by the repulsive pion-nucleus optical potential which pushes pionic wavefunctions outwards so that the nuclear absorption of the bound pions is weakened. Theoretical studies on pion-transfer reactions were carried out as a methodological guide to produce these deeply bound pionic states experimentally. In particular, various predictions were made on the pion-transfer proton-pickup reactions (n, d) and (d, He-3). Following these theoretical studies successful experiments on high-resolution spectroscopy of (d, He-3) reactions were carried out at GSI. The experimental procedures and results together with their theoretical implications are also reviewed. The most important feature of deeply bound Is states of pi(-) in heavy nuclei is that it provides unique information on the s-wave isovector pi(-) N interaction which is connected to reduction of chiral symmetry breaking in the nuclear medium. Recent experiments on Pb and Sn isotopes have yielded clear evidence for partial restoration of chiral symmetry in the nuclear medium. (C) 2012 Elsevier B.V. All rights reserved., Apr. 2012, 514, 1-2, 1, 87
  • Not Refereed, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, ELSEVIER SCIENCE BV, η '-Nucleus optical potential and possible η ' bound states, H. Nagahiro; S. Hirenzaki; E. Oset; A. Ramos, Starting from a recent model of the η 'N interaction, we evaluate the η '-nucleus optical potential, including the contribution of lowest order in density, tρ/2mη', together with the second-order terms accounting for η ' absorption by two nucleons. We also calculate the formation cross section of the η ' bound states from (π +, p) reactions on nuclei. The η '-nucleus potential suffers from uncertainties tied to the poorly known η 'N interaction, which can be partially constrained by the experimental modulus of the η 'N scattering length and/or the recently measured transparency ratios in η ' nuclear photoproduction. Assuming an attractive interaction and taking the claimed experimental value |a η'N|=0.1 fm, we obtain an η ' optical potential in nuclear matter at saturation density of Vη'=-(8.7+1.8i)MeV, not attractive enough to produce η ' bound states in light nuclei. Larger values of the scattering length give rise to deeper optical potentials, with moderate enough imaginary parts. For a value |aη'N|=0.3fm, which can still be considered to lie within the uncertainties of the experimental constraints, the spectra of light and medium nuclei show clear structures associated to η '-nuclear bound states and to threshold enhancements in the unbound region. © 2012 Elsevier B.V., 13 Mar. 2012, 709, 1-2, 87, 92, Scientific journal
  • Not Refereed, PHYSICAL REVIEW C, AMER PHYSICAL SOC, Nuclear bound state of eta ' (958) and partial restoration of chiral symmetry in the eta ' mass, Daisuke Jido; Hideko Nagahiro; Satoru Hirenzaki, The in-medium mass of the eta' meson is discussed in a context of partial restoration of chiral symmetry in nuclear medium. The eta' mass is expected to be reduced by an order of 100 MeV at the saturation density. The reduction is a consequence of the suppression of the anomaly effect on the eta' mass induced by partial restoration of chiral symmetry. This strong attraction in eta' nuclear systems does not accompany large absorption of eta' into nuclear matter. This leads to the possibility of so narrow bound states of the eta' meson in nuclei to be seen in hadronic reactions with light nuclear targets., Mar. 2012, 85, 3, 032201, 1-5, Scientific journal
  • The European Physical Journal A, Springer Science and Business Media LLC, Pionic atom spectroscopy in the (d,3 He) reaction at finite angles, N. Ikeno; H. Nagahiro; S. Hirenzaki, Dec. 2011, 47, 12, Scientific journal
  • Not Refereed, Physical Review C - Nuclear Physics, AMER PHYSICAL SOC, Formation of heavy-meson bound states by two-nucleon pick-up reactions, N. Ikeno; J. Yamagata-Sekihara; H. Nagahiro; D. Jido; S. Hirenzaki, We develop a model to evaluate the formation rate of the heavy mesic nuclei in two-nucleon pick-up reactions and apply it to the 6Li target cases for the formation of heavy meson-α bound states, as examples. The existence of the quasideuteron in the target nucleus is assumed in this model. It is found that mesic nuclei formation in recoilless kinematics is possible even for heavier mesons than the nucleon in two-nucleon pick-up reactions. We find the formation rate of the meson-α bound states can be around half of the elementary cross sections at the recoilless kinematics with small distortions. © 2011 American Physical Society., 09 Nov. 2011, 84, 5, 054609, 1-7, Scientific journal
  • Not Refereed, PROGRESS OF THEORETICAL PHYSICS, PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE, Precision Spectroscopy of Deeply Bound Pionic Atoms and Partial Restoration of Chiral Symmetry in Medium, Natsumi Ikeno; Rie Kimura; Junko Yamagata-Sekihara; Hideko Nagahiro; Daisuke Jido; Kenta Itahashi; Li Sheng Geng; Satoru Hirenzaki, We study theoretically the formation spectra of deeply bound pionic atoms expected to be observed by experiments with high energy resolution at RIBF/RIKEN, and we discuss in detail the possibilities to extract new information on the pion properties at finite density from the observed spectra, which may provide information on partial restoration of chiral symmetry in medium. We find that the non-yrast pionic states such as 2s are expected to be seen in the (d,He-3) spectra, which will be helpful to reduce uncertainties of the theoretical calculations in the neutron wave functions in nucleus. The observation of the 2s state with the ground is state is also helpful to reduce the experimental uncertainties associated in the calibration of the absolute excitation energy. We find that the nuclear densities probed by atomic pions are quite stable and almost constant for various atomic states and various nuclei. Effects of the pion wave function renormalization to the formation spectra are also evaluated., Sep. 2011, 126, 3, 483, 509, Scientific journal
  • Refereed, INTERNATIONAL JOURNAL OF MODERN PHYSICS A, WORLD SCIENTIFIC PUBL CO PTE LTD, A THEORETICAL MODEL FOR FORMATION OF eta-He-4 BOUND STATE BY d plus d REACTION, Satoru Hirenzaki; Hideko Nagahiro; Daisuke Jido, In this article, we consider theoretically the d+d reaction for the formation of the eta-He-4 bound state. We evaluate the formation rate and show expected spectra using a simple theoretical model with Green's function method., Feb. 2011, 26, 3-4, 444, 449, Scientific journal
  • Not Refereed, PROGRESS OF THEORETICAL PHYSICS, PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE, Formation of phi Mesic Nuclei, Junko Yamagata-Sekihara; Daniel Cabrera; Manuel J. Vicente Vacas; Satoru Hirenzaki, We consider the structure and formation of the phi mesic nuclei to investigate the experimental feasibility of the observation of signals of the phi mesic nucleus formation. phi mesic nuclei are considered to be very important objects to study the in-medium modification of the phi-meson spectral function at finite density. We consider ((p) over bar, phi), (gamma, p) and (pi(-), n) reactions to produce a phi-meson inside the nucleus and evaluate the effects of its medium modifications to the reaction cross sections. We also estimate the consequences of the uncertainties of the in-medium (K) over bar self-energy to the phi-nucleus interaction. We find that it may be possible to see peak structures in the reaction spectra for the strong attractive potential cases. On the other hand, for strong absorptive interaction cases with relatively weak attraction, it is very difficult to observe clear peaks and we may need to know the spectrum shape in a wide energy region to deduce the properties of phi., Jul. 2010, 124, 1, 147, 162, Scientific journal
  • Refereed, Physical Review C - Nuclear Physics, American Physical Society, Proton emission off nuclei induced by kaons in flight, V. K. Magas; J. Yamagata-Sekihara; S. Hirenzaki; E. Oset; A. Ramos, We study the (K-,p) reaction on nuclei with a 1 GeV/c momentum kaon beam, paying special attention to the region of emitted protons having kinetic energy above 600 MeV, which was used to claim a deeply attractive kaon nucleus optical potential. Our model describes the nuclear reaction in the framework of a local density approach and the calculations are performed following two different procedures: one is based on a many-body method using the Lindhard function and the other is based on a Monte Carlo simulation. The simulation method offers flexibility to account for processes other than kaon quasielastic scattering, such as K- absorption by one and two nucleons, producing hyperons, and allows consideration of final-state interactions of the K-, the p, and all other primary and secondary particles on their way out of the nucleus, as well as the weak decay of the produced hyperons into πN. We find a limited sensitivity of the cross section to the strength of the kaon optical potential. We also show a serious drawback in the experimental setup-the requirement for having, together with the energetic proton, at least one charged particle detected in the decay counter surrounding the target-as we find that the shape of the original cross section is appreciably distorted, to the point of invalidating the claims made in the experimental paper on the strength of the kaon nucleus optical. © 2010 The American Physical Society., 24 Feb. 2010, 81, 2, Scientific journal
  • Not Refereed, PHYSICAL REVIEW C, AMER PHYSICAL SOC, Proton emission off nuclei induced by kaons in flight, V. K. Magas; J. Yamagata-Sekihara; S. Hirenzaki; E. Oset; A. Ramos, We study the (K-, p) reaction on nuclei with a 1 GeV/c momentum kaon beam, paying special attention to the region of emitted protons having kinetic energy above 600 MeV, which was used to claim a deeply attractive kaon nucleus optical potential. Our model describes the nuclear reaction in the framework of a local density approach and the calculations are performed following two different procedures: one is based on a many-body method using the Lindhard function and the other is based on a Monte Carlo simulation. The simulation method offers flexibility to account for processes other than kaon quasielastic scattering, such as K- absorption by one and two nucleons, producing hyperons, and allows consideration of final-state interactions of the K-, the p, and all other primary and secondary particles on their way out of the nucleus, as well as the weak decay of the produced hyperons into pi N. We find a limited sensitivity of the cross section to the strength of the kaon optical potential. We also show a serious drawback in the experimental setup-the requirement for having, together with the energetic proton, at least one charged particle detected in the decay counter surrounding the target-as we find that the shape of the original cross section is appreciably distorted, to the point of invalidating the claims made in the experimental paper on the strength of the kaon nucleus optical., Feb. 2010, 81, 2, 024609 1-10, Scientific journal
  • Refereed, New frontiers in QCD. Exotic hadron systems and dense matter. Proceedings, 24th International Nishinomiya-Yukawa Memorial Workshop, NFQCD 2010, Kyoto, Japan, January 18-March 19, 2010, Ohnishi Akira; Jido Daisuke; Dote Akinobu; Fujii Hirotsugu; Hirenzaki Satoru; Hyodo Tetsuo; Iida Kei; Tachibana Motoi, [Prog. Theor. Phys. Suppl.186,pp.1(2010)], 2010, 1, 571
  • Refereed, INTERNATIONAL JOURNAL OF MODERN PHYSICS E, WORLD SCIENTIFIC PUBL CO PTE LTD, FORMATION OF eta-MESIC NUCLEI BY (pi, N) REACTION AND CHIRAL SYMMETRY FOR BARYONS, Hideko Nagahiro; Daisuke Jido; Satoru Hirenzaki, We calculate formation spectra of eta-nucleus systems in (pi, N) reactions with nuclear targets, which can be performed at existing and/or forthcoming facilities, including J-PARC, in order to investigate eta-nucleus interactions. Based on the N*(1535) dominance in the eta N system, eta-mesic nuclei are suitable systems for study of in-medium properties of the N* (1535) baryon resonance, such as reduction of the mass difference of N and N* in nuclear medium, which affects level structure of the eta and N*-hole modes. We find that clear information on the in-medium N*- and eta-nucleus interactions can be obtained through the formation spectra of the eta-mesic nuclei., Nov. 2009, 18, 10, 2202, 2206, Scientific journal
  • Refereed, Physical Review C - Nuclear Physics, American Physical Society, Formation spectra of light kaonic nuclei by in-flight (K̄,N) reactions with a chiral unitary amplitude, J. Yamagata-Sekihara; D. Jido; H. Nagahiro; S. Hirenzaki, We study theoretically the in-flight (K-,N) reactions for the formation of light kaonic nuclear systems to get deeper physical insights on the spectra and to investigate the formation spectra of the reaction that will be observed at new facilities like the Japan Proton Accelerator Research Complex (J-PARC). We show the expected spectra for the formation of the K-pp, K-pn, K-nn, and K - B11 systems that are accessible by the (K-,N) experiments. By considering the conversion part of the Green's function, we show the missing mass spectra of the (K-,N) reactions in coincident with the particle emissions due to K̄ absorption. To calculate the cross sections, we use the so-called Tρ approximation to evaluate the optical potential. As for the amplitude T, we adopt the chiral unitary amplitude of K̄N channel in vacuum for simplicity. The effects of the p-wave optical potential of Σ(1385) channel and the contributions from K̄0 mixing in He3(K-,n) reaction are also evaluated numerically. We also study the behavior of the poles of kaon Green's function in nuclear matter. We conclude that He3(K-,n) and He3(K-,p) reaction spectra in coincident with the πΣ emission may show the structure in the kaon bound region indicating the existence of the unstable kaonic nuclear states. As for the C12(K-,p) spectra with the πΣ emission, we may also observe the structure in the bound region, however, we need to evaluate the medium effects carefully for larger nuclei. © 2009 The American Physical Society., 09 Oct. 2009, 80, 4, Scientific journal
  • Not Refereed, PHYSICAL REVIEW C, AMER PHYSICAL SOC, Formation spectra of light kaonic nuclei by in-flight ((K)over-bar, N) reactions with a chiral unitary amplitude, J. Yamagata-Sekihara; D. Jido; H. Nagahiro; S. Hirenzaki, We study theoretically the in-flight (K-, N) reactions for the formation of light kaonic nuclear systems to get deeper physical insights on the spectra and to investigate the formation spectra of the reaction that will be observed at new facilities like the Japan Proton Accelerator Research Complex (J-PARC). We show the expected spectra for the formation of the K- pp, K- pn, K- nn, and K--B-11 systems that are accessible by the (K-, N) experiments. By considering the conversion part of the Green's function, we show the missing mass spectra of the (K-, N) reactions in coincident with the particle emissions due to (K) over bar absorption. To calculate the cross sections, we use the so-called T rho approximation to evaluate the optical potential. As for the amplitude T, we adopt the chiral unitary amplitude of (K) over barN channel in vacuum for simplicity. The effects of the p-wave optical potential of Sigma (1385) channel and the contributions from (K) over bar (0) mixing in He-3(K-, n) reaction are also evaluated numerically. We also study the behavior of the poles of kaon Green's function in nuclear matter. We conclude that He-3(K-, n) and He-3(K-, p) reaction spectra in coincident with the pi Sigma emission may show the structure in the kaon bound region indicating the existence of the unstable kaonic nuclear states. As for the C-12(K-, p) spectra with the pi Sigma emission, we may also observe the structure in the bound region, however, we need to evaluate the medium effects carefully for larger nuclei., Oct. 2009, 80, 4, 045204 1-12, Scientific journal
  • Not Refereed, PHYSICAL REVIEW C, AMER PHYSICAL SOC, Formation of eta-mesic nuclei by the (pi,N) reaction and properties of N*(1535) in medium (vol 80, 025205, 2009), Hideko Nagahiro; Daisuke Jido; Satoru Hirenzaki, Sep. 2009, 80, 3, 025205 1-13, Scientific journal
  • Refereed, Nuclear Physics A, ELSEVIER SCIENCE BV, Meson and Baryon resonances, E. Oset; L. S. Geng; D. Gamermann; R. Molina; D. Nicmorus; J. Yamagata-Sekihara; H. Nagahiro; S. Hirenzaki; D. Jido; M. Döring; A. Ramos, In this talk I review recent advances on the structure of the meson and baryon resonances which can be dynamically generated from the interaction of mesons or mesons and baryons. Particular emphasis is put on results involving vector mesons, which bring new light into the nature of some of the observed higher mass mesons and baryons and make predictions for new states. © 2009 Elsevier B.V. All rights reserved., 15 Aug. 2009, 827, 1-4, 255c, 260c, Scientific journal
  • Not Refereed, Physical Review C - Nuclear Physics, AMER PHYSICAL SOC, Erratum: Charged current neutrino-induced coherent pion production (Physical Review C (2007) 75 (055501)), L. Alvarez-Ruso; L. S. Geng; S. Hirenzaki; M. J.Vicente Vacas, 06 Aug. 2009, 80, 1, Scientific journal
  • Refereed, PHYSICAL REVIEW C, AMER PHYSICAL SOC, Formation of eta-mesic nuclei by the (pi,N) reaction and properties of N-*(1535) in medium, Hideko Nagahiro; Daisuke Jido; Satoru Hirenzaki, We calculate formation spectra of the eta-nucleus systems in the (pi,N) reactions with nuclear targets, which can be performed at existing and/or forthcoming facilities, including the Japan Proton Accelerator Research Complex, to investigate the eta-nucleus interaction. Based on the N-*(1535) dominance in the eta N system, the eta-mesic nuclei are suitable systems for the study of in-medium properties of the N-*(1535) baryon resonance, such as reduction of the mass difference of N and N-* in the nuclear medium, which affects the level structure of the eta and N-*-hole modes. We find that clear information on the in-medium N-*- and eta-nucleus interactions can be obtained through the formation spectra of the eta-mesic nuclei. We also discuss the experimental feasibilities by showing several spectra of the (pi,N) reactions calculated with possible experimental settings. Coincident measurements of the N pi pairs from the N-* decays in nuclei help us to reduce backgrounds., Aug. 2009, 80, 2, Scientific journal
  • Refereed, Physical Review D - Particles, Fields, Gravitation and Cosmology, γγ decay of the f0(1370) and f2(1270) resonances in the hidden gauge formalism, H. Nagahiro; J. Yamagata-Sekihara; E. Oset; S. Hirenzaki; R. Molina, Using recent results obtained within the hidden gauge formalism for vector mesons, in which the f0(1370) and f2(1270) resonances are dynamically generated resonances from the ρρ interaction, we evaluate the radiative decay of these resonances into γγ. We obtain results for the width in good agreement with the experimental data for the f2(1270) state and a width about a factor 2 smaller for the f0(1370) resonance, which is also in agreement with the data of the Crystal Ball Collaboration and with the more recent ones from the Belle Collaboration, which, however, have a very large uncertainty. © 2009 The American Physical Society., 22 Jun. 2009, 79, 11, Scientific journal
  • Not Refereed, PHYSICAL REVIEW D, AMER PHYSICAL SOC, gamma gamma decay of the f(0)(1370) and f(2)(1270) resonances in the hidden gauge formalism, H. Nagahiro; J. Yamagata-Sekihara; E. Oset; S. Hirenzaki; R. Molina, Using recent results obtained within the hidden gauge formalism for vector mesons, in which the f(0)(1370) and f(2)(1270) resonances are dynamically generated resonances from the rho rho interaction, we evaluate the radiative decay of these resonances into gamma gamma. We obtain results for the width in good agreement with the experimental data for the f(2)(1270) state and a width about a factor 2 smaller for the f(0)(1370) resonance, which is also in agreement with the data of the Crystal Ball Collaboration and with the more recent ones from the Belle Collaboration, which, however, have a very large uncertainty., Jun. 2009, 79, 11, 114023 1-7, Scientific journal
  • Not Refereed, Nuclear Physics A, ELSEVIER SCIENCE BV, Level crossing of particle-hole and mesonic modes in eta-mesonic nuclei, D. Jido; E. E. Kolomeitsev; H. Nagahiro; S. Hirenzaki, We study eta-meson properties in the infinite nuclear matter and in atomic nuclei with an emphasis on effects of the eta coupling to N* (1535)-nucleon-hole modes. The N* (1535) resonance, which dominates the low-energy eta-nucleon scattering, can be seen as a chiral partner of the nucleon. The change of the chiral mass gap between the N* and the nucleon in a nuclear medium has an impact on the properties of the eta-nucleus system. If the N*-nucleon mass gap decreases with a density increase (chiral symmetry restoration) the calculations show the existence of the resonance state at the energy about 60 MeV and two bound eta-nucleus states with the binding energies about - 80 MeV. These states can have strong effect on predicted cross sections of the 12C(γ, p)11B reaction with eta-meson production. © 2008 Elsevier B.V. All rights reserved., 01 Oct. 2008, 811, 1-2, 158, 178, Scientific journal
  • Refereed, PHYSICAL REVIEW C, AMERICAN PHYSICAL SOCIETY, Formation of deeply bound kaonic atoms in (K-, N) reactions, 山縣 淳子; 永廣 秀子; 永廣 秀子; 比連崎 悟; 比連崎 悟; 木村 梨恵, Copyright 〓2007 The American Physical Society. All rights reserved.We study theoretically the (K-,N) reactions for the formation of the deeply bound kaonic atoms, which were predicted to be quasistable with narrow widths, using the Green's function method. We systematically consider various cases with different target nuclei and energies and find clear signals in the theoretical spectra for all cases considered in this article. The signals show very interesting structures, such as a RESONANCE DIP instead of a resonance peak. We discuss the origins of the interesting structures and the possibilities of obtaining new information on the existence of kaonic nuclei from the spectra of atomic state formations., 31 Oct. 2007, 76, 4, 45204, 1-045204-10
  • Not Refereed, PHYSICAL REVIEW C, AMER PHYSICAL SOC, Formation of deeply bound kaonic atoms in (K-, N) reactions, J. Yamagata; H. Nagahiro; R. Kimura; S. Hirenzaki, We study theoretically the (K-,N) reactions for the formation of the deeply bound kaonic atoms, which were predicted to be quasistable with narrow widths, using the Green's function method. We systematically consider various cases with different target nuclei and energies and find clear signals in the theoretical spectra for all cases considered in this article. The signals show very interesting structures, such as a RESONANCE DIP instead of a resonance peak. We discuss the origins of the interesting structures and the possibilities of obtaining new information on the existence of kaonic nuclei from the spectra of atomic state formations., Oct. 2007, 76, 4, 045204, 1-10, Scientific journal
  • Not Refereed, Physical Review C - Nuclear Physics, AMERICAN PHYSICAL SOC, Possible ω bound states in nuclei produced with the (γ,p) reaction, M. Kaskulov; H. Nagahiro; S. Hirenzaki; E. Oset, We perform calculations for ω production in nuclei by means of the (γ,p) reaction for photon energies and proton angles suited to currently running and future experiments in present laboratories. For some cases of possible ω optical potentials, we find that clear peaks are observable when a good resolution in the ω energy is available. We also study the inclusive production of π0γ in nuclei around the ω energy and find a double hump structure for the energy spectra, with a peak around a π0γ energy of mω-100 MeV, which could easily be misidentified by a signal of an ω bound state in nuclei, while it is actually due to a different scaling of the uncorrelated π0γ production and ω production with subsequent π0γ decay. © 2007 The American Physical Society., 26 Jun. 2007, 75, 6, 064616, 1-10, Scientific journal
  • Refereed, Physical Review C - Nuclear Physics, Charged current neutrino-induced coherent pion production, L. Alvarez-Ruso; L. S. Geng; S. Hirenzaki; M. J.Vicente Vacas, We analyze the neutrino induced charged current coherent pion production at the energies of interest for recent experiments like K2K and MiniBooNE. Medium effects in the production mechanism and the distortion of the pion wave function, obtained solving the Klein Gordon equation with a microscopic optical potential, are included in the calculation. We find a strong reduction of the cross section due to these effects and also substantial modifications of the energy distributions of the final lepton and pion. © 2007 The American Physical Society., 18 May 2007, 75, 5, Scientific journal
  • Not Refereed, PHYSICAL REVIEW C, AMER PHYSICAL SOC, Charged current neutrino-induced coherent pion production, L. Alvarez-Ruso; L. S. Geng; S. Hirenzaki; M. J. Vicente Vacas, We analyze the neutrino induced charged current coherent pion production at the energies of interest for recent experiments like K2K and MiniBooNE. Medium effects in the production mechanism and the distortion of the pion wave function, obtained solving the Klein Gordon equation with a microscopic optical potential, are included in the calculation. We find a strong reduction of the cross section due to these effects and also substantial modifications of the energy distributions of the final lepton and pion., May 2007, 75, 5, 055501, 1-11, Scientific journal
  • Not Refereed, The European Physical Journal A - Hadrons and Nuclei, Springer Berlin / Heidelberg, Kaon absorption from kaonic atoms and formation spectra of kaonic nuclei, 山縣 淳子; 比連崎 悟; 比連崎 悟, The original publication is available at www.springerlink.comWe considered the kaon absorption from atomic states into the nucleus. We found that the nuclear density probed by the atomic kaon significantly depends on the kaon orbit. Then, we re-examined the meanings of the observed strengths of one-body and two-body kaon absorption, and investigated the effects to the formation spectra of kaon bound states by in-flight (K-, p) reactions. As a natural consequence, if the atomic kaon probes a smaller nuclear density, the ratio of the two-body absorption at nuclear center is larger than the observed value in kaonic atoms, and the depth of the imaginary potential is deeper even at smaller kaon energies as in kaonic nuclear states because of the large phase space for the two-body processes. This deeper imaginary potential makes the signals of kaonic nucleus formation more unclear in the (K-, p) spectra., 08 Feb. 2007, 31, 2, 255, 262
  • Not Refereed, PHYSICAL REVIEW C, AMER PHYSICAL SOC, eta- and eta '-mesic nuclei and U-A(1) anomaly at finite density, Hideko Nagahiro; Makoto Takizawa; Satoru Hirenzaki, We discuss theoretically the possibility of observing the bound states of the eta and eta(')(958) mesons in nuclei. We apply the NJL model to study the eta and eta(') meson properties at finite density and calculate the formation cross sections of the eta and eta(') bound states with the Green function method for (gamma,p) reaction. We also discuss the experimental feasibility at photon facilities like SPring-8. The contributions due to the omega meson production are also included to obtain the realistic (gamma,p) spectra. We conclude that we can expect to observe resonance peaks in (gamma,p) spectra for the formation of meson bound states and we can deduce new information on eta and eta(') properties at finite density. These observations are believed to be essential to know the possible mass shift of eta(') and deduce new information on the effective restoration of the U-A(1) anomaly in the nuclear medium., Oct. 2006, 74, 4, 045203, Scientific journal
  • Not Refereed, PHYSICAL REVIEW C, AMER PHYSICAL SOC, In-flight (K-,p) reactions for the formation of kaonic atoms and kaonic nuclei using the Green function method, J. Yamagata; H. Nagahiro; S. Hirenzaki, We study theoretically the kaonic atom and kaonic nucleus formations in the in-flight (K-,p) reactions using the Green function method, which is suited to evaluate formation rates both of stable and unstable bound systems. We consider C-12 and O-16 as the targets and calculate the spectra of the (K-,p) reactions. We conclude that no peak structure resulting from kaonic nucleus formation is expected in the reaction spectra calculated with the chiral unitary kaon-nucleus optical potential. In the spectra with the phenomenological deep kaon-nucleus potential, it may be possible to observe some structures because of the formation of the kaonic nucleus states. For all cases, we find clear signals because of the kaonic atom formations in the reaction spectra, which show very interesting structures, such as the RESONANCE DIP instead of the resonance peak for the atomic 1s state formation., Jul. 2006, 74, 1, 014604 1-9, Scientific journal
  • Refereed, Physical Review C - Nuclear Physics, American Physical Society, η- and η'-mesic nuclei and UA(1) anomaly at finite density, Hideko Nagahiro; Makoto Takizawa; Satoru Hirenzaki, We discuss theoretically the possibility of observing the bound states of the η and η'(958) mesons in nuclei. We apply the NJL model to study the η and η' meson properties at finite density and calculate the formation cross sections of the η and η' bound states with the Green function method for (γ,p) reaction. We also discuss the experimental feasibility at photon facilities like SPring-8. The contributions due to the ω meson production are also included to obtain the realistic (γ,p) spectra. We conclude that we can expect to observe resonance peaks in (γ,p) spectra for the formation of meson bound states and we can deduce new information on η and η' properties at finite density. These observations are believed to be essential to know the possible mass shift of η' and deduce new information on the effective restoration of the UA(1) anomaly in the nuclear medium. © 2006 The American Physical Society., 2006, 74, 4, Scientific journal
  • Refereed, Physical Review C - Nuclear Physics, American Physical Society, In-flight (K-,p) reactions for the formation of kaonic atoms and kaonic nuclei using the Green function method, J. Yamagata; H. Nagahiro; S. Hirenzaki, We study theoretically the kaonic atom and kaonic nucleus formations in the in-flight (K-,p) reactions using the Green function method, which is suited to evaluate formation rates both of stable and unstable bound systems. We consider C12 and O16 as the targets and calculate the spectra of the (K-,p) reactions. We conclude that no peak structure resulting from kaonic nucleus formation is expected in the reaction spectra calculated with the chiral unitary kaon-nucleus optical potential. In the spectra with the phenomenological deep kaon-nucleus potential, it may be possible to observe some structures because of the formation of the kaonic nucleus states. For all cases, we find clear signals because of the kaonic atom formations in the reaction spectra, which show very interesting structures, such as the RESONANCE DIP instead of the resonance peak for the atomic 1s state formation. © 2006 The American Physical Society., 2006, 74, 1, Scientific journal
  • Not Refereed, Nuclear Physics A, ELSEVIER SCIENCE BV, Formation of mesic nuclei by (γ, p) reactions, H. Nagahiro; D. Jido; S. Hirenzaki, We present a theoretical study on formation rates of η and ω meson-nucleus systems induced by (γ, p) reactions on nuclear targets at ideal recoilless condition. We find that the smaller distortion effect in the (γ, p) reaction enables us to investigate properties of the mesons created deeply inside nucleus more clearly. We also consider excitation of scalar-isoscalar (σ) mode in nucleus in order to investigate spectral enhancement around two-pion threshold caused by partial restoration of chiral symmetry. We conclude that valuable information of meson-nucleus interactions can be extracted from global structure of the missing mass spectra in the (γ, p) reaction. © 2005 Elsevier B.V. All rights reserved., 31 Oct. 2005, 761, 1-2, 92, 119, Scientific journal
  • Not Refereed, PROGRESS OF THEORETICAL PHYSICS, PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE, Formation of kaonic atoms and kaonic nuclei in in-flight (K-, p) reactions (vol 114, pg 301, 2005), J Yamagata; H Nagahiro; Y Okumura; S Hirenzaki, Oct. 2005, 114, 4, 905, 905
  • Progress of Theoretical Physics, Erratum: Formation of kaonic atoms and kaonic nuclei in in-flight (K -, p) reactions (Progress of Theoretical Physics (2005) 114 (301)), Junko Yamagata; Hideko Nagahiro; Yuko Okumura; Satoru Hirenzaki, Oct. 2005, 114, 4, 905, Scientific journal
  • Not Refereed, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, ELSEVIER SCIENCE BV, Production of Θ+ hypernuclei with the K( ++) reaction, H. Nagahiro; S. Hirenzaki; E. Oset; M. J. Vicente Vacas, We present results on the production of bound states of Θ+ in nuclei using the (K+,π+) reaction. By taking into account the states obtained within a wide range of strength of the Θ+ nucleus optical potential, plus the possibility to replace different nucleons of the nucleus, we obtain an excitation spectra with clearly differentiated peaks. The magnitude of the calculated cross sections is well within reachable range. © 2005 Elsevier B.V. All rights reserved., 04 Aug. 2005, 620, 3-4, 125, 130, Scientific journal
  • Refereed, Progress of Theoretical Physics, PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE, Formation of kaonic atoms and kaonic nuclei in in-flight (K-, p) reactions, Junko Yamagata; Hideko Nagahiro; Yuko Okumura; Satoru Hirenzaki, We theoretically study kaonic atom and kaonic nucleus formation in in-flight (K-, p) reactions for C, O, Si and Ca targets. Deeply bound kaonic atoms were previously predicted to exist as quasi-stable states, and it is expected that they can be observed using certain well-suited experimental methods. Kaonic nuclear states have also been predicted to exist with large decay widths. We evaluate the formation cross sections of kaonic atoms and kaonic nuclei using an effective number approach. We show that indications of kaonic bound states can be observed in the outgoing proton energy spectra., Aug. 2005, 114, 2, 301, 316, Scientific journal
  • Not Refereed, Physical Review Letters, AMERICAN PHYSICAL SOC, Formation of η′(958)-mesic nuclei and axial UA(1) anomaly at finite density, Hideko Nagahiro; Satoru Hirenzaki, We discuss the possibility of producing the bound states of the η′(958) meson in nuclei theoretically. We calculate the formation cross sections of the η′ bound states with the Green function method for the (γ,p) reaction and discuss the experimental feasibility at photon facilities such as SPring-8. We conclude that we can expect to observe resonance peaks in (γ,p) spectra for the formation of η′ bound states and we can deduce new information on η′ properties at finite density. These observations are believed to be essential to know the possible mass shift of η′ and deduce new information on the effective restoration of the chiral UA(1) anomaly in the nuclear medium. © 2005 The American Physical Society., 17 Jun. 2005, 94, 23, 232503 1-4, 232503, Scientific journal, True
  • Refereed, Physical Review C - Nuclear Physics, American Physical Society (APS), Residual interaction effects on deeply bound pionic states in Sn and Pb isotopes, N. Nose-Togawa; H. Nagahiro; S. Hirenzaki; K. Kume, We have studied the residual interaction effects theoretically on the deeply bound pionic states in Pb and Sn isotopes. We need to evaluate the residual interaction effects carefully to deduce the nuclear medium effects for pion properties, which are believed to provide valuable information on nuclear chiral dynamics. The s- and p-wave πN interactions are used for the pion-nucleon residual interactions. We show that the complex energy shifts are around [(10-20) + i(2-7)] keV for 1s states in Sn, which should be taken into account in the analyses of the high precision data of deeply bound pionic 1s states in Sn isotopes. © 2005 The American Physical Society., Jun. 2005, 71, 6, 061601, Scientific journal
  • Not Refereed, PHYSICAL REVIEW C, AMER PHYSICAL SOC, Mass-number dependence of the forward-angle cross section for pion single-charge-exchange reactions, N Nose-Togawa; T Mizushima; S Hirenzaki; K Kume, The mass-number dependences of the high-energy pion single-charge-exchange reactions are studied under the distorted-wave impulse approximation. The observed forward-angle cross sections are approximately proportional to (N-Z)xA(-alpha(E)) for the isobaric-analog transition and the overall feature is explained in the present calculation. The coefficient alpha(E) is shown to be strongly dependent on the imaginary part of the optical potential. The observed monotonic decrease of the coefficient alpha(E) with respect to the incident energy is reproduced but the absolute values of alpha(E) are smaller than those of experiment. It is also shown that the coefficient alpha(E) is considerably influenced by the rms radii of the isovector density of the target nuclei., Mar. 2004, 69, 3, 034609 1-6, Scientific journal
  • Refereed, Physical Review C - Nuclear Physics, Mass-number dependence of the forward-angle cross section for pion single-charge-exchange reactions, N. Nose-Togawa; T. Mizushima; S. Hirenzaki; K. Kume, The mass-number dependences of the high-energy pion single-charge-exchange reactions are studied under the distorted-wave impulse approximation. The observed forward-angle cross sections are approximately proportional to (N-Z) × A-α(E) for the isobaric-analog transition and the overall feature is explained in the present calculation. The coefficient α(E) is shown to be strongly dependent on the imaginary part of the optical potential. The observed monotonic decrease of the coefficient α(E) with respect to the incident energy is reproduced but the absolute values of α(E) are smaller than those of experiment. It is also shown that the coefficient α(E) is considerably influenced by the rms radii of the isovector density of the target nuclei., Mar. 2004, 69, 3, 034609, 1, Scientific journal
  • Not Refereed, Physical Review Letters, AMER PHYSICAL SOC, Precision Spectroscopy of Pionic [Formula presented] States of Sn Nuclei and Evidence for Partial Restoration of Chiral Symmetry in the Nuclear Medium, K. Suzuki; M. Fujita; H. Geissel; H. Gilg; A. Gillitzer; R. S. Hayano; S. Hirenzaki; K. Itahashi; M. Iwasaki; P. Kienle; M. Matos; G. Münzenberg; T. Ohtsubo; M. Sato; M. Shindo; T. Suzuki; H. Weick; M. Winkler; T. Yamazaki; T. Yoneyama, Deeply bound [Formula presented] states of [Formula presented] in [Formula presented] were preferentially observed using the [Formula presented] pion-transfer reaction under the recoil-free condition. The [Formula presented] binding energies and widths were precisely determined and were used to deduce the isovector parameter of the [Formula presented]-wave pion-nucleus potential to be [Formula presented]. The observed enhancement of [Formula presented] over the free [Formula presented] value ([Formula presented]) indicates a reduction of the chiral order parameter, [Formula presented], at the normal nuclear density, [Formula presented]. © 2004 The American Physical Society., 2004, 92, 7, 723021, 723024, Scientific journal
  • Not Refereed, PHYSICAL REVIEW C, AMER PHYSICAL SOC, eta-nucleus interactions and in-medium properties of N-*(1535) in chiral models, H Nagahiro; D Jido; S Hirenzaki, The properties of eta-nucleus interaction and their experimental consequences are investigated with eta-nucleus optical potentials obtained by postulating the N-*(1535) dominance for eta-N system. The N*(1535) properties in the nuclear medium are evaluated by two kinds of chiral effective models based on distinct pictures of N*(1535). We find that these two models provide qualitatively different optical potentials of the eta meson, reflecting the in-medium properties of N*(1535) in these models. In order to compare these models in physical observables, we calculate spectra of (d,He-3) reactions for the eta mesic nucleus formation with various kinds of target nuclei. We show that the (d,He-3) spectra obtained in these models are significantly different and are expected to be distinguishable in experiments., Sep. 2003, 68, 3, 035205 1-9, Scientific journal
  • Physical Review C - Nuclear Physics, η-nucleus interactions and in-medium properties of N* (1535) in chiral models, H. Nagahiro; D. Jido; S. Hirenzaki, The properties of η-nucleus interaction and their experimental consequences are investigated with η-nucleus optical potentials obtained by postulating the η-N(1535) dominance for η-N system. The N*(1535) properties in the nuclear medium are evaluated by two kinds of chiral effective models based on distinct pictures of N*(1535), We find that these two models provide qualitatively different optical potentials of the η meson, reflecting the in-medium properties of N*(1535) in these models. In order to compare these models in physical observables, we calculate spectra of (d,3He) reactions for the η mesic nucleus formation with various kinds of target nuclei. We show that the (d,3He) spectra obtained in these models are significantly different and are expected to be distinguishable in experiments., Sep. 2003, 68, 3, 352051, 352059, Scientific journal
  • Not Refereed, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, ELSEVIER SCIENCE BV, Effective parameters representing a density-dependent pion-nucleus potential, Toshimitsu Yamazaki; Satoru Hirenzaki, We have shown that the s-wave pion-nucleus potential with medium-modified density-dependent parameters, such as b0(ρ) and b1 (ρ), can be represented by a conventional form with constant parameters by replacing the nuclear density (ρ(r)) with an effective density, ρe ≈ 0.60 ρ(0). The parameters in the conventional Ericson-Ericson potential are thus interpreted as being effective ones containing density-dependent effects. © 2003 Published by Elsevier Science B.V., 27 Mar. 2003, 557, 1-2, 20, 25, Scientific journal
  • Not Refereed, Physical Review C - Nuclear Physics, AMERICAN PHYSICAL SOC, Pionic atom formation in halo nuclei by [Formula Presented] reactions, M. Fujita; S. Hirenzaki; K. Kume, We investigate the formation cross sections of the deeply bound pionic atoms on halo nuclei theoretically. We consider one-neutron pickup [Formula Presented] reaction for the pionic atom formation and find that the formation rate is significantly increased by the existence of the halo neutron with long tail of the wave function. This enhancement is expected to increase the experimental feasibility for the formation of the deeply bound pionic states on [Formula Presented]-unstable nuclei. © 2003 The American Physical Society., 2003, 67, 3, 7, 346057, Scientific journal
  • Refereed, Physical Review C - Nuclear Physics, [Formula Presented]-nucleus interactions and in-medium properties of [Formula Presented] in chiral models, H. Nagahiro; D. Jido; S. Hirenzaki, The properties of [Formula Presented]-nucleus interaction and their experimental consequences are investigated with [Formula Presented]-nucleus optical potentials obtained by postulating the [Formula Presented] dominance for [Formula Presented] system. The [Formula Presented] properties in the nuclear medium are evaluated by two kinds of chiral effective models based on distinct pictures of [Formula Presented] We find that these two models provide qualitatively different optical potentials of the [Formula Presented] meson, reflecting the in-medium properties of [Formula Presented] in these models. In order to compare these models in physical observables, we calculate spectra of [Formula Presented] reactions for the [Formula Presented] mesic nucleus formation with various kinds of target nuclei. We show that the [Formula Presented] spectra obtained in these models are significantly different and are expected to be distinguishable in experiments. © 2003 The American Physical Society., 2003, 68, 3, 9, Scientific journal
  • Not Refereed, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, ELSEVIER SCIENCE BV, Experimental indication of a reduced chiral order parameter from the 1s π- state in 205Pb, H. Geissel; H. Gilg; A. Gillitzer; R. S. Hayano; S. Hirenzaki; K. Itahashi; M. Iwasaki; P. Kienle; M. Münch; G. Münzenberg; W. Schott; K. Suzuki; D. Tomono; H. Weick; T. Yamazaki; T. Yoneyama, The isovector potential parameter (b1) of the s-wave pion-nucleus interaction was deduced to be b1 = -0.116-0.017+0.015mπ-1 by using the binding energy and width of the recently observed deeply bound 1s π- state in 205Pb combined with the known 1s states of light pionic atoms. An enhancement of b1 over the free-πN value (|-0.090|) is indicated, which may infer that the chiral order parameter (squared pion decay constant, fπ2) is reduced by a factor of 0.78-0.09+0.13 in the nuclear medium of 205Pb where the bound π- is located. The isoscalar part is accounted for as arising mainly from a double-scattering effect, without invoking a large density-quadratic term. © 2002 Elsevier Science B.V. All rights reserved., 28 Nov. 2002, 549, 1-2, 64, 71, Scientific journal
  • Not Refereed, Nuclear Physics A, ELSEVIER SCIENCE BV, Formation of σ mesic nuclei in (d, t) and (d, 3He) reactions, S. Hirenzaki; H. Nagahiro; T. Hatsuda; T. Kunihiro, We explore the possibility to observe an enhanced 2π correlation in the scalar-isoscalar (σ) channel in nuclei by (d, t) and (d, 3He) reactions to obtain new information on the partial restoration of chiral symmetry in the nuclear medium. The sensitivity of the reaction spectra on the change of the chiral condensate in the nuclear medium is examined. © 2002 Elsevier Science B.V. All rights reserved., 04 Nov. 2002, 710, 1-2, 131, 144, Scientific journal
  • Not Refereed, Physical Review C - Nuclear Physics, AMER PHYSICAL SOC, Medium effects to the N(1535) resonance and η mesic nuclei, D. Jido; H. Nagahiro; S. Hirenzaki, The structure of η-nucleus bound systems (η mesic nuclei) is investigated as one of the tools to study in-medium properties of the N(1535)(N*) resonance by using the chiral doublet model to incorporate the medium effects of the N* resonance in a chiral symmetric way. We find that the shape and depth of the η-nucleus optical potential are strongly affected by the in-medium properties of the N* and nucleon. Especially, as a general feature of the potential, the existence of a repulsive core of the η-nucleus potential at the nuclear center with an attractive part at the nuclear surface is concluded. We calculate the level structure of bound states in this "central-repulsive and surface-attractive" optical potential and find that the level structure is sensitive to the in-medium properties of the N*. The (d,3He) spectra are also evaluated for the formation of these bound states to investigate the experimental feasibility. We also make comments on the possible existence of halo-like η states in β-unstable halo nuclei., 01 Oct. 2002, 66, 4, 452021, 452027, Scientific journal
  • Not Refereed, Physical Review Letters, AMER PHYSICAL SOC, Deeply bound 1s and 2p pionic states in 205Pb and determination of the s-wave part of the pion-nucleus interaction, H. Geissel; H. Gilg; A. Gillitzer; R. S. Hayano; S. Hirenzaki; K. Itahashi; M. Iwasaki; P. Kienle; M. Münch; G. Münzenberg; W. Schott; K. Suzuki; D. Tomono; H. Weick; T. Yamazaki; T. Yoneyama, The deeply bound 1s and 2p pionic states were observed in 205Pb. The binding energies and the widths of 205Pb were determined. Binding energies and widths were used to deduce the real and imaginary strengths of the s-wave part of the pion-nucleus interaction, which translated into a positive mass shift of pion in 205Pb., 25 Mar. 2002, 88, 12, 1223011, 1223014, Scientific journal
  • Not Refereed, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, ELSEVIER SCIENCE BV, Deeply bound pionic atoms from the (γ, p) reaction in nuclei, S. Hirenzaki; E. Oset, We study the (γ, p) reaction on 208Pb leading to 207Pb with a bound pion attached to it in the lowest 1s or 2p pionic levels. The reaction can be made recoilless to optimize the production cross section but we must choose a bit higher photon energy to overcome the Coulomb barrier in the proton emission. The cross sections obtained are easily measurable and can be larger than 50 per cent of the background from inclusive (γ, p). This makes it a clear case for the detection of the pionic atom signals, converting this reaction into a practical tool to produce deeply bound pionic atoms. © 2002 Elsevier Science B.V. All rights reserved., 14 Feb. 2002, 527, 1-2, 69, 72, Scientific journal
  • Not Refereed, Nuclear Physics A, ELSEVIER SCIENCE BV, Chiral loops and VMD in the V → P Pγ decays, J. E. Palomar; S. Hirenzaki; E. Oset, We evaluate radiative decays of ρ and ω going to two neutral mesons, π0π0 and π0η. We use the sequential vector decay mechanisms in addition to chiral loops and ρ-ω mixing. The chiral loops are obtained using elements of UXPT successfully applied in the study of meson-meson interactions up to 1.2 GeV. The chiral loops are found very important in the case of the ρ → π0π0γ decay and small in the other cases. A good agreement with present measurements of ρ → π0π0γ and ω → π0π0γ is obtained and predictions are made for the other decays where the rates obtained are rather small. © 2002 Elsevier Science B.V. All rights reserved., 2002, 707, 1-2, 161, 172, Scientific journal
  • Refereed, Physical Review C - Nuclear Physics, Medium effects to the [Formula Presented] resonance and [Formula Presented] mesic nuclei, D. Jido; H. Nagahiro; S. Hirenzaki, The structure of [Formula Presented]-nucleus bound systems [Formula Presented] mesic nuclei) is investigated as one of the tools to study in-medium properties of the [Formula Presented] resonance by using the chiral doublet model to incorporate the medium effects of the [Formula Presented] resonance in a chiral symmetric way. We find that the shape and depth of the [Formula Presented]-nucleus optical potential are strongly affected by the in-medium properties of the [Formula Presented] and nucleon. Especially, as a general feature of the potential, the existence of a repulsive core of the [Formula Presented]-nucleus potential at the nuclear center with an attractive part at the nuclear surface is concluded. We calculate the level structure of bound states in this “central-repulsive and surface-attractive” optical potential and find that the level structure is sensitive to the in-medium properties of the [Formula Presented] The [Formula Presented] spectra are also evaluated for the formation of these bound states to investigate the experimental feasibility. We also make comments on the possible existence of halo-like [Formula Presented] states in [Formula Presented]-unstable halo nuclei. © 2002 The American Physical Society., 2002, 66, 4, 7, Scientific journal
  • Refereed, Physical Review Letters, Deeply Bound [Formula presented] and [Formula presented] Pionic States in [Formula presented] and Determination of the [Formula presented]-Wave Part of the Pion-Nucleus Interaction, H. Geissel; H. Gilg; A. Gillitzer; R. S. Hayano; S. Hirenzaki; K. Itahashi; M. Iwasaki; P. Kienle; M. Münch; G. Münzenberg; W. Schott; K. Suzuki; D. Tomono; H. Weick; T. Yamazaki; T. Yoneyama, We observed well-separated [Formula presented] and [Formula presented] [Formula presented] states in [Formula presented] in the [Formula presented] reaction at [Formula presented]. The binding energies and the widths determined are [Formula presented], [Formula presented], [Formula presented], and [Formula presented]. They are used to deduce the real and imaginary strengths of the [Formula presented]-wave part of the pion-nucleus interaction, which translates into a positive mass shift of [Formula presented] in [Formula presented]. © 2002 The American Physical Society., 2002, 88, 12, 4, Scientific journal
  • Refereed, Nuclear Physics A, ELSEVIER SCIENCE BV, Antikaons in nuclei and dense nuclear matter, A. Ramos; S. Hirenzaki; S. S. Kamalov; T. T.S. Kuo; Y. Okumura; E. Oset; A. Polls; H. Toki; L. Tolós, We present recent progress on the properties of antikaons in nuclei and dense nuclear matter as obtained from two K̄ N interaction models: one based on the lowest-order meson-baryon chiral lagrangian and the other derived from a meson-exchange picture., 13 Aug. 2001, 691, 1-2, 258, 267, Scientific journal
  • Not Refereed, Nuclear Physics A, ELSEVIER SCIENCE BV, Deeply bound pionic atoms on β -unstable nuclei, Y. Umemoto; S. Hirenzaki; K. Kume; H. Toki; I. Tahihata, We study the structure and formation of deeply bound pionic atoms on β-unstable nuclei. We calculate the eigenenergies of the pionic atoms using the model nuclear densities and the realistic pion-nucleus optical potential. We also investigate the formation cross sections of the deeply bound pionic atoms in the inverse reaction d(RI,3He)X using an effective number approach for wide range of unstable nuclei with the closed neutron number so as to check the experimental feasibility. © 2001 Elsevier Science B.V., 01 Jan. 2001, 679, 3-4, 549, 562, Scientific journal
  • Not Refereed, Physical Review C - Nuclear Physics, AMERICAN PHYSICAL SOC, Deeply bound π- states in 207Pb formed in the 208Pb(d, 3He) reaction. II. Deduced binding energies and widths and the pion-nucleus interaction, K. Itahashi; K. Oyama; R. S. Hayano; H. Gilg; A. Gillitzer; M. Knülle; M. Münch; W. Schott; P. Kienle; H. Geissel; N. Iwasa; G. Münzenberg; S. Hirenzaki; H. Toki; T. Yamazaki, We find a remarkable agreement of the excitation energy spectrum of the 208Pb(d,3He) reaction measured at Td=600 MeV near the π- production threshold with its theoretical prediction. Their comparison leads us to assign the distinct narrow peak observed at about 5 MeV below the threshold to the formation of bound pionic states π ⊗ 207Pb of the quasisubstitutional configurations (2p)π-(3p3/2,3p1/2)-1n . A small bump observed on the tail of the peak is assigned to the pionic 1s state. The binding energies (Bnl) and the widths (Γnl) of the pionic orbitals are deduced to be B2p=5.13±0.02 (stat)±0.12 (syst) MeV and Γ2p = 0.43±0.06 (stat) ±0.06 (syst) MeV by decomposing the experimental spectrum into the pionic 1s and 2p components. While B2p and Γ2p are determined with small ambiguity, B2p and Γ2p are strongly correlated with each other, and are affected by the relative 1 s/2p cross section ratio assumed, since the 1s component is observed only as an unresolved bump. Thus, we have to allow large uncertainties 6.6 MeV<;B1s<6.9 MeV and 0.4 MeV<Γ1s <1.2 MeV. The experimental binding energies and widths are compared with theoretically calculated values based on various optical potential parameter sets, and are jointly used to deduce the effective π- mass in the nuclear medium., Aug. 2000, 62, 2, 252021, 2520212, Scientific journal
  • Not Refereed, Physical Review C - Nuclear Physics, AMERICAN PHYSICAL SOC, Isotope dependence of deeply bound pionic states in Sn and Pb, Y. Umemoto; S. Hirenzaki; K. Kume; H. Toki, We have studied the isotope dependence of deeply bound pionic states in Sn and Pb in order to examine the possibility of obtaining important information on neutron density distribution and the modification of the pion decay constant fπ in a nuclear medium. Formation cross sections of the pionic states are calculated in the (d, 3He) reactions. The present results indicate that the isotope dependence of the pionic states can be deduced from the experimental data with accessible energy resolution. The effects of the neutron skin for the formation cross sections are also examined and are found to affect the (d, 3He) spectra significantly., Aug. 2000, 62, 2, 246061, 246068, Scientific journal
  • Refereed, Nuclear Physics A, ELSEVIER SCIENCE BV, Recent progress on the chiral unitary approach to meson meson and meson baryon interactions, E. Oset; J. A. Oller; J. R. Peláez; A. Ramos; H. C. Chiang; F. Guerrero; S. Hirenzaki; T. S.H. Lee; E. Marco; J. C. Nacher; Y. Okumura; A. Parreño; H. Toki; M. Vicente-Vacas, We report on recent progress on the chiral unitary approach, analogous to the effective range expansion in Quantum Mechanics, which is shown to have a much larger convergence radius than ordinary chiral perturbation theory, allowing one to reproduce data for meson meson interaction up to 1.2 GeV. Applications to physical processes so far unsuited for a standard chiral perturbative approach are presented. Results for the extension of these ideas to the meson baryon sector are discussed, together with applications to kaons in a nuclear medium and K- atoms., 08 May 2000, 670, 1-4, 111, 118, Scientific journal
  • Not Refereed, Physical Review C - Nuclear Physics, AMERICAN PHYSICAL SOC, Chiral unitary model for the kaonic atom, S. Hirenzaki; Y. Okumura; H. Toki; E. Oset; A. Ramos, We study kaonic atoms over the periodic table using a kaon self-energy in the nuclear medium derived from the SU(3) chiral unitary model. This model is quite successful in reproducing the scattering amplitude of meson meson and the strangeness S = - 1 meson baryon reactions. In particular the properties of the Δ (1405) resonance are well reproduced. In the nuclear medium the properties of this resonance are appreciably modified, and consequently the kaon nucleon scattering amplitudes, leading to an attractive kaon nucleus self-energy for densities higher than ρ0/25. With this interaction we are able to reproduce shifts and widths of kaonic atoms over the periodic table. We also investigate the region of deeply bound kaonic nuclear states which appear with very large widths in medium and heavy nuclei. Some of the deep atomic states, still unobserved, appear with narrower widths than the separation between levels, which makes them eligible for experimental observation. To this end, we make some estimates of the rates of formation in the (K-,γ) reaction., May 2000, 61, 5, 552051, 552056, Scientific journal
  • Not Refereed, PHYSICAL REVIEW C, AMER PHYSICAL SOC, Projectile Delta and target Roper excitation in the p(d,d ') X reaction, S Hirenzaki; E Oset; C Djalali; M Morlet, In this paper we compare a model that contains the mechanisms of Delta excitation in the projectile and Roper excitation in the target with experimental data from two (d,d') experiments on a proton target. The agreement of the theory with the experiment is fair for the data taken at T-d = 2.3 GeV. The Delta excitation in the projectile is predicted close to the observed energy with the correct width. The theory, however, underpredicts by about 40% the cross sections measured at T-d = 1.6 GeV at angles where the cross section has fallen by about two orders of magnitude. The analysis done here allows us to extract an approximate strength for the excitation of the Roper [N*(1440)] excitation and a qualitative agreement with the theoretical predictions is also found., Apr. 2000, 61, 4, 044605 1-7, Scientific journal
  • Physical Review C - Nuclear Physics, Projectile Δ and target roper excitation in the p(d,d′)X reaction, S. Hirenzaki; E. Oset; C. Djalali; M. Morlet, In this paper we compare a model that contains the mechanisms of Δ excitation in the projectile and Roper excitation in the target with experimental data from two (d,d′) experiments on a proton target. The agreement of the theory with the experiment is fair for the data taken at Td=2.3 GeV. The Δ excitation in the projectile is predicted close to the observed energy with the correct width. The theory, however, underpredicts by about 40% the cross sections measured at Td = 1.6 GeV at angles where the cross section has fallen by about two orders of magnitude. The analysis done here allows us to extract an approximate strength for the excitation of the Roper [N*(1440)] excitation and a qualitative agreement with the theoretical predictions is also found., Apr. 2000, 61, 4, 446051, 446057, Scientific journal
  • Not Refereed, Progress of Theoretical Physics, PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE, Formation of deeply bound 1s pionic states of intermediate mass nuclei in (d,3He) reactions, Yukiko Umemoto; Satoru Hirenzaki; Kenji Kume; Hiroshi Toki, We study the formation cross sections of the deeply bound 1s pionic states in (d,3He) reactions at intermediate energies. We investigate the reaction spectra for the three target nuclei 136Xe, 116Sn and 112Cd, which involve the (s1/2)n neutron orbit in outer shell. We conclude that the (d,3He) reactions at Td = 500 MeV with 136Xe and 116Sn targets are the best candidates to observe the deepest 1s pionic states with very high accuracy., Feb. 2000, 103, 2, 337, 350, Scientific journal
  • Refereed, Physical Review C - Nuclear Physics, Deeply bound [Formula Presented] states in [Formula Presented] formed in the [Formula Presented] reaction. II. Deduced binding energies and widths and the pion-nucleus interaction, K. Itahashi; K. Oyama; R. S. Hayano; H. Gilg; A. Gillitzer; M. Knülle; M. Münch; W. Schott; P. Kienle; H. Geissel; N. Iwasa; G. Münzenberg; S. Hirenzaki; H. Toki; T. Yamazaki, We find a remarkable agreement of the excitation energy spectrum of the [Formula Presented] reaction measured at [Formula Presented] near the [Formula Presented] production threshold with its theoretical prediction. Their comparison leads us to assign the distinct narrow peak observed at about 5 MeV below the threshold to the formation of bound pionic states [Formula Presented] of the quasisubstitutional configurations [Formula Presented] A small bump observed on the tail of the peak is assigned to the pionic [Formula Presented] state. The binding energies [Formula Presented] and the widths [Formula Presented] of the pionic orbitals are deduced to be [Formula Presented] and [Formula Presented] by decomposing the experimental spectrum into the pionic [Formula Presented] and [Formula Presented] components. While [Formula Presented] and [Formula Presented] are determined with small ambiguity, [Formula Presented] and [Formula Presented] are strongly correlated with each other, and are affected by the relative [Formula Presented] cross section ratio assumed, since the [Formula Presented] component is observed only as an unresolved bump. Thus, we have to allow large uncertainties [Formula Presented] and [Formula Presented] The experimental binding energies and widths are compared with theoretically calculated values based on various optical potential parameter sets, and are jointly used to deduce the effective [Formula Presented] mass in the nuclear medium. © 2000 The American Physical Society., 2000, 62, 2, 12, Scientific journal
  • Refereed, Physical Review C - Nuclear Physics, Projectile [Formula Presented] and target Roper excitation in the [Formula Presented] reaction, S. Hirenzaki; E. Oset; C. Djalali; M. Morlet, In this paper we compare a model that contains the mechanisms of [Formula Presented] excitation in the projectile and Roper excitation in the target with experimental data from two [Formula Presented] experiments on a proton target. The agreement of the theory with the experiment is fair for the data taken at [Formula Presented] GeV. The [Formula Presented] excitation in the projectile is predicted close to the observed energy with the correct width. The theory, however, underpredicts by about 40% the cross sections measured at [Formula Presented] GeV at angles where the cross section has fallen by about two orders of magnitude. The analysis done here allows us to extract an approximate strength for the excitation of the Roper [Formula Presented] excitation and a qualitative agreement with the theoretical predictions is also found. © 2000 The American Physical Society., 2000, 61, 4, 7, Scientific journal
  • Not Refereed, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, ELSEVIER SCIENCE BV, Radiative decay of ρ0 and φ mesons in a chiral unitary approach, E. Marco; S. Hirenzaki; E. Oset; H. Toki, We study the ρ0 and φ decays into π+ π- γ, π0π0γ and φ into π0ηγ using a chiral unitary approach to deal with the final state interaction of the MM system. The final state interaction modifies only moderately the large momenta tail of the photon spectrum of the p0→ π+π-γ decay. In the case of φ decay the contribution to π+π-γ and π0π0γ decay proceeds via kaonic loops and gives a distribution of ππ invariant masses in which the f0(980) resonance shows up with a very distinct peak. The spectrum found for φ → π0π0γ decay agrees with the recent experimental results obtained at Novosibirsk. The branching ratio for φ → π0ηγ, dominated by the a0(980), is also in agreement with recent Novosibirsk results. (C) 1999 Elsevier Science B.V., 16 Dec. 1999, 470, 1-4, 20, 26, Scientific journal
  • Not Refereed, PHYSICAL REVIEW C, AMER PHYSICAL SOC, Residual interaction effects on deeply bound pionic states, S Hirenzaki; H Kaneyasu; K Kume; H Toki; Y Umemoto, We have studied the residual interaction effects theoretically on the deeply bound pionic states which have been observed recently. In order to extract precise information on the pion-nucleus optical potential, we need to evaluate the residual interaction effects on the pionic states. The S-wave pi N interaction is used for the pion-nucleon residual interaction. We show that the complex eigenenergies vary typically about 0-20 keV and that the effects should be taken into account carefully in the analysis of data with high precision. [S0556-2813(99)02711-9]., Nov. 1999, 60, 5, 058202, 1-4, Scientific journal
  • Refereed, Physical Review C - Nuclear Physics, Residual interaction effects on deeply bound pionic states, S. Hirenzaki; H. Kaneyasu; K. Kume; H. Toki; Y. Umemoto, We have studied the residual interaction effects theoretically on the deeply bound pionic states which have been observed recently. In order to extract precise information on the pion-nucleus optical potential, we need to evaluate the residual interaction effects on the pionic states. The S-wave πN interaction is used for the pion-nucleon residual interaction. We show that the complex eigenenergies vary typically about 0-20 keV and that the effects should be taken into account carefully in the analysis of data with high precision., Nov. 1999, 60, 5, 582021, 582024, Scientific journal
  • Not Refereed, International Journal of Modern Physics E, WORLD SCIENTIFIC PUBL CO PTE LTD, Proton elastic scattering and neutron distribution of unstable nuclei, K. Kaki; S. Hirenzaki, We study theoretically how we can determine the neutron density distributions of unstable nuclei from proton elastic scattering. We apply the relativistic impulse model to study the sensitivities of the observables to the density distributions which are expressed in Woods-Saxon form. We find that both the radius and diffuseness of densities can be determined from restricted elastic scattering data in principle. We think this result is helpful to design future experiments., Apr. 1999, 8, 2, 167, 178, Scientific journal
  • Not Refereed, Progress of Theoretical Physics, PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE, Photon absorption on a neutron-proton pair in 3He and 4He, Yukiko Umemoto; Satoru Hirenzaki; Kenji Kume, We have developed a phenomenological quasi-deuteron model to describe photodisintegration reactions of 3He and 4He at intermediate photon energies and compared the results with experimental data obtained by the TAGX group in which contributions from photon absorption by pn pairs were selectively observed. The data can be reproduced reasonably well. However there still remain certain discrepancies between calculated results and data., Mar. 1999, 101, 3, 627, 638, Scientific journal
  • Not Refereed, Nuclear Physics A, ELSEVIER SCIENCE BV, Pion-nucleus potential parameters and quadrupole effect in deeply bound pionic atom, N. Nose-Togawa; S. Hirenzaki; K. Kume, We have examined a possibility of determining the pion-nucleus potential parameters from the quadrupole hyperfine structure of the deeply bound pionic atoms in deformed nuclei. It is shown that the potential parameter sets, which lead to the similar level shifts and widths for spherical nuclei, predict fairly different hyperfine structure in deformed nuclei. However, the individual hyperfine levels overlap due to the large widths of deeply bound pionic levels and the detailed level structure is masked somewhat. The sensitivity of the pionic X-ray transition spectrum to the different potential parameter sets is also studied and could be used to distinguish the potential parameter sets experimentally. © 1999 Elsevier Science B.V., 22 Feb. 1999, 646, 4, 467, 478, Scientific journal
  • Not Refereed, European Physical Journal A, SPRINGER VERLAG, Formation of η/ω-mesic nuclei using the recoilless (d,3He) reaction, R. S. Hayano; S. Hirenzaki; A. Gillitzer, We discuss the possibility to use the recoilless (d,3He) reaction to produce bound states of η and ω mesons in light nuclei. We calculate meson bound states in the nucleus using an optical potential and their formation cross sections with the Green function method, and show that it should be feasible to experimentally observe mesic nuclei in the excitation energy spectrum and to deduce the meson mass shift in nuclei. This method discussed here is complementary to the dilepton invariant-mass spectroscopy, commonly used to study in-medium vector meson masses., 1999, 6, 1, 99, 105, Scientific journal
  • Not Refereed, Physical Review C - Nuclear Physics, AMERICAN PHYSICAL SOC, Roper excitation in [Formula Presented] reactions, S. Hirenzaki; A. D. Bacher; S. E. Vigdor, We calculate differential cross sections and the spin transfer coefficient [Formula Presented] in the [Formula Presented] reaction for proton bombarding energies from 1 to 10 GeV and [Formula Presented] invariant masses spanning the region of the [Formula Presented] Roper resonance. Two processes—[Formula Presented] excitation in the [Formula Presented] particle and Roper excitation in the proton—are included in an effective reaction model which was shown previously to reproduce existing inclusive spectra. The present calculations demonstrate that these two contributions can be clearly distinguished via [Formula Presented] even under kinematic conditions where cross sections alone exhibit no clear peak structure due to the excitation of the Roper resonance. © 1999 The American Physical Society., 1999, 59, 3, 1735, 1742, Scientific journal
  • Not Refereed, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, ELSEVIER SCIENCE BV, Effective pion mass in the nuclear medium deduced from deeply bound pionic states in 207Pb, T. Yamazaki; R. S. Hayano; K. Itahashi; K. Oyama; A. Gillitzer; H. Gilg; M. Knülle; M. Münch; P. Kienle; W. Schott; W. Weise; H. Geissel; N. Iwasa; G. Münzenberg; S. Hirenzaki; H. Toki, Deeply bound Is states of π- as well as the 2p states in 207Pb were identified in the 208Pb(d,3He) reaction at 600 MeV. The binding energies of π- in 207Pb have been determined as Sπ(2p) = 5.31 ± 0.09 MeV and Bπ(1s) = 7.1 ± 0.2 MeV by comparing the observed Q-value spectrum with theory. These values indicate that the effective π- mass increases by 19.3 ± 2.7 MeV at the center of the 207Pb nucleus. © 1998 Published by Elsevier Science B.V., 05 Feb. 1998, 418, 3-4, 246, 251, Scientific journal
  • Not Refereed, Nuclear Physics A, ELSEVIER SCIENCE BV, Neutron pick-up pion transfer reactions for the formation of deeply bound pionic atoms in 208Pb, S. Hirenzaki; H. Toki, We study (n, d) and (d, 3He) reactions on 208Pb leading to deeply bound pionic atoms with one neutron hole being left. We develop a theoretical model to calculate cross sections of deeply bound pionic atoms and quasi-elastic pion production. The results are compared with data which have been obtained so far. We show that the theoretical model describes the data of both reactions well. © 1998 Elsevier Science B.V., 19 Jan. 1998, 628, 3, 403, 416, Scientific journal
  • Not Refereed, Nuclear Physics A, ELSEVIER SCIENCE BV, Nuclear quadrupole effects in deeply bound pionic atoms, N. Nose-Togawa; S. Hirenzaki; K. Kume, We have studied nuclear quadrupole deformation effects in deeply bound pionic atoms theoretically. We have evaluated the level shifts and widths of the hyperfine components using the first order perturbation theory and compared them with the effects of neutron skin. We conclude that the nuclear quadrupole deformation effects for deeply bound 1s and 2p states are very difficult to observe and that the effects could be observed for 3d states. We also conclude that the deformation effects are sensitive to the parameters of the pion-nucleus optical potential. © 1997 Elsevier Science B.V., 22 Sep. 1997, 623, 3-4, 548, 558, Scientific journal
  • Not Refereed, PHYSICAL REVIEW C, AMERICAN PHYSICAL SOC, Formation of deeply bound 1s pionic states in the Pb-206(d,He-3) reaction, S Hirenzaki; H Toki, Recently, deeply bound pionic states were found experimentally in (d,He-3) reactions on Pb-208. The observed spectrum showed an excellent agreement with the distorted-wave impulse approximation calculation and the dominant peak was attributed to the pionic 2p state contribution. We studied theoretically Pb-206(d,He-3) reactions within the same model, and found that it is very likely to observe the pionic is state as an isolated peak in the Pb-206(d,He-3) reaction with feasible energy resolution and statistics., May 1997, 55, 5, 2719, 2722, Scientific journal
  • Not Refereed, ZEITSCHRIFT FUR PHYSIK A-HADRONS AND NUCLEI, SPRINGER VERLAG, Theoretical response to the discovery of deeply bound pionic states in Pb-208(d,He-3) reactions, H Toki; S Hirenzaki; K Takahashi, Recently, deeply bound pionic states were found experimentally in (d, He-3) reactions on Pb-208. They found an isolated peak structure in the bound region below the pion production threshold. We study theoretically these excitation functions in (d, He-3) reactions on Pb-208 at T-d=600MeV. We found very good agreement with the (d, He-3) excitation functions and could identify the underlying structures of the pionic states. We study the energy dependence of the (d, He-3) reactions and the change of the excitation functions with the incident energy., Jan. 1997, 356, 4, 359, 361, Scientific journal
  • Refereed, Physical Review C - Nuclear Physics, Formation of deeply bound [Formula Presented] pionic states in the [Formula Presented] reaction, S. Hirenzaki; H. Toki, Recently, deeply bound pionic states were found experimentally in [Formula Presented] reactions on [Formula Presented] The observed spectrum showed an excellent agreement with the distorted-wave impulse approximation calculation and the dominant peak was attributed to the pionic [Formula Presented] state contribution. We studied theoretically [Formula Presented] reactions within the same model, and found that it is very likely to observe the pionic [Formula Presented] state as an isolated peak in the [Formula Presented] reaction with feasible energy resolution and statistics. © 1997 The American Physical Society., 1997, 55, 5, 2719, 2722, Scientific journal
  • Not Refereed, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, ELSEVIER SCIENCE BV, Isoscalar roper excitation in p (α, α′) reactions in the 10-15 GeV region, S. Hirenzaki; E. Oset; P. Fernández De Córdoba, Recent experiments at Saturne at 4 GeV showed that the (α, α′) reaction on the proton shows two distinctive peaks, which were associated to Δ projectile excitation and Roper target excitation. A subsequent theoretical analysis has shown that this picture is qualitatively correct but there are important interference effects between the two mechanisms. Futhermore, at this energy the ratio of strengths for the Roper and Δ peak is about 1/4. In the present paper we argue that by going to the 10-15 GeV region the interference effects become negligible, the signal for the Roper excitation is increased by more than an order of magnitude and the ratio of cross sections at the peaks for Roper and Δ excitation becomes of the order of unity, thus making this range of energies very appropiate for studies of isoscalar Roper excitation., 20 Jun. 1996, 378, 1-4, 29, 34, Scientific journal
  • Not Refereed, Physical Review C - Nuclear Physics, AMERICAN PHYSICAL SOC, Roper excitation in α-proton scattering, S. Hirenzaki; P. Fernández De Córdoba; E. Oset, We study the Roper excitation in the (α, α′) reaction. We consider all processes which may be relevant in the Roper excitation region, namely, Roper excitation in the target, Roper excitation in the projectile, and double Δ excitation processes. The theoretical investigation shows that the Roper excitation in the proton target mediated by an isoscalar exchange is the dominant mechanism in the process. We determine an effective isoscalar interaction by means of which the experimental cross section is well reproduced. This should be useful to make predictions in related reactions and is a first step to construct eventually a microscopic NN→NN* transition potential, for which the present reaction does not offer enough information., Jan. 1996, 53, 1, 277, 284, Scientific journal
  • Not Refereed, Nuclear Physics, Section A, ELSEVIER SCIENCE BV, (3He,t) reactions on unstable nuclei at intermediate energies, S. Hirenzaki; P. Fernández de Córdoba; N. Fukunishi; D. Hirata; H. Kitagawa; M. J. Vicente-Vacas, We study the charge-exchange (3He,t) reactions on unstable nuclei theoretically. Since this charge-exchange reaction takes place on the nuclear surface, this reaction is very sensitive to the neutron skin, and we show that the calculated cross sections are affected strongly by the existence of the neutron skin. This reaction can be observed using the inverse-kinematics method. We think the (3He,t) reaction is very useful to observe the neutron skins and also to get new information on isospin dependence of the Δ excitation mechanism in nuclei. © 1995., 22 May 1995, 587, 4, 787, 801, Scientific journal
  • Not Refereed, Nuclear Physics, Section A, ELSEVIER SCIENCE BV, Microscopic kaonic-atom optical potential in finite nuclei with Λ(1405) and Σ(1385) resonances, Masaki Mizoguchi; Satoru Hirenzaki; Hiroshi Toki, We derive kaonic-atom optical potentials in finite nuclei microscopically by taking into account the K- NΛ(1405) and K- NΣ(1385) interactions. Using the microscopic optical potentials we solve kaonic atoms with the Klein-Gordon equation in momentum space and obtain the kaonic-atom level shifts and the widths. The experimental data are reproduced well. We discuss also phenomenological optical potentials and compare them with the microscopic ones. In addition, we derive optical potentials in the local-density approximation with the use of the finite-matter kaon self-energy. We find a similarity with the microscopic optical potential derived with finite geometry. © 1994., 31 Jan. 1994, 567, 4, 893, 918, Scientific journal
  • Not Refereed, PHYSICAL REVIEW C, AMER PHYSICAL SOC, GENERAL FORMULA FOR THE COALESCENCE MODEL, S HIRENZAKI; T SUZUKI; TANIHATA, I, We have derived a general formula for the coalescence model that expresses the formation cross sections for various kinds of composite particles consisting of an arbitrary number of particles with different interaction ranges and masses. We have studied the formation of light nuclei to confirm the validity of this model. We have also studied the formation of a double-lambda hypernucleus (He-6(LAMBDALAMBDA)) and a pineut (pi- n2) as examples. This formula is extremely useful for studying the formation cross sections of composite particles., Nov. 1993, 48, 5, 2403, 2408, Scientific journal
  • Not Refereed, Physics Letters B, ELSEVIER SCIENCE BV, Coherent π0 electroproduction, S. Hirenzaki; J. Nieves; E. Oset; M. J. Vicente-Vacas, We analyze the coherent electroproduction of neutral pions in nuclei. We find that this process does not contribute to the longitudinal response function for spin saturated nuclei and the dependence of the cross section on the azimuthal pion angle is particularly simple and given by 1-ε{lunate} cos 2øπ. This angular dependence could be useful to isolate the coherent contribution in future experiments, offering an advantage over coherent photoproduction. The Δ-peak is considerably moved to lower pion energies and appreciably modified due to medium corrections. © 1993., Apr. 1993, 304, 3-4, 198, 202, Scientific journal
  • Not Refereed, Nuclear Physics, Section A, ELSEVIER SCIENCE BV, Proton elastic scattering with 9Li and 11Li and its halo structure, S. Hirenzaki; H. Toki; I. Tanihata, We have studied the proton elastic scattering of 9Li and 11Li using the Born approximation and the optical potential approach. We first studied the data qualitatively by the Born approximation and found that the small cross section of p + 11Li, which had been observed at Ep = 62 MeV, can be understood as the break-up effect of halo neutrons from 11Li. We then searched for the optical potential parameters for both p + 9Li and p + 11Li under the assumption that 11Li has a halo structure of two weakly bound neutrons around the 9Li core. We found a good parameter set and concluded that the break-up effect of halo neutrons is essential to understand the p + 11Li data. © 1993., 01 Feb. 1993, 552, 1, 57, 65, Scientific journal
  • Not Refereed, Physical Review C, AMERICAN PHYSICAL SOC, Search for a bound state of a negative pion and neutrons in O18+Be collisions, T. Suzuki; M. Fujimaki; S. Hirenzaki; N. Inabe; T. Kobayashi; T. Kubo; T. Nakagawa; Y. Watanabe; I. Tanihata; S. Shimoura, A bound system of π- and neutrons (pineuts) was searched for in the fragmentation region of O18 + Be collisions at 100A MeV. The upper limits for the production cross sections were obtained to be 0.08 and 0.20 nb at the 90% confidence level for singly charged systems π-n2 and π-n3, respectively. © 1993 The American Physical Society., 1993, 47, 6, 2673, 2676, Scientific journal
  • Refereed, Physical Review C, General formula for the coalescence model, S. Hirenzaki; T. Suzuki; I. Tanihata, We have derived a general formula for the coalescence model that expresses the formation cross sections for various kinds of composite particles consisting of an arbitrary number of particles with different interaction ranges and masses. We have studied the formation of light nuclei to confirm the validity of this model. We have also studied the formation of a double-lambda hypernucleus (ΛΛ6He) and a pineut (π-n2) as examples. This formula is extremely useful for studying the formation cross sections of composite particles. © 1993 The American Physical Society., 1993, 48, 5, 2403, 2408, Scientific journal
  • Not Refereed, Physics Letters B, ELSEVIER SCIENCE BV, Measurements of 11Li+p and 9Li+p elastic scatterings at 60 MeV, C. B. Moon; M. Fujimaki; S. Hirenzaki; N. Inabe; K. Katori; J. C. Kim; Y. K. Kim; T. Kobayashi; T. Kubo; H. Kumagai; S. Shimoura; T. Suzuki; I. Tanihata, Proton elastic scatterings of neutron rich nuclei 9Li and 11Li have been measured for the first time at Elab/A=60 and 62 MeV, respectively, under the inverse kinematical conditions. While the angular distribution of 9Li scattering follows the systematic trend from those of 6Li and 7Li scatterings, the 11Li cross section is smaller by about a factor of two. Optical model calculations show that considerable changes in both real and imaginary potentials are necessary to reproduce the 11Li data. © 1992., 24 Dec. 1992, 297, 1-2, 39, 43, Scientific journal
  • Not Refereed, Zeitschrift für Physik A Hadrons and Nuclei, Springer-Verlag, Λ polarization in12C(π-, Λ) reactions at pπ=4 GeV/c, S. Hirenzaki; F. Iseki; K. I. Kubo, We study the Λ formation cross sections and Λ polarizations based on the Regge pole amplitudes in the π-+12C→Λ+X(inclusive) reactions and the exclusive kaon channel reactions at pπ=4 GeV/c. We found that the experimental data of inclusive cross sections can be reproduced qualitatively well by our calculation. As for the polarization, we have the experimental data that were reported by two different groups, although they have opposite sign and different magnitudes. Our calculated results do not agree with either set of data. We show that the sign of polarization is sensitive to the outgoing Λ kinetic energy in the inclusive reactions and to the outgoing kaon angle in the exclusive kaon channel reactions. © 1992 Springer-Verlag., Dec. 1992, 343, 4, 471, 475, Scientific journal
  • Not Refereed, MODERN PHYSICS LETTERS A, WORLD SCIENTIFIC PUBL CO PTE LTD, PION DOUBLE CHARGE-EXCHANGE REACTIONS LEADING TO DOUBLE PIONIC ATOMS, J NIEVES; E OSET; S HIRENZAKI; H TOKI; MJ VICENTEVACAS, We study theoretically pion double charge exchange reactions leading to double pionic atoms. The reaction cross-sections with two pions in the deeper bound pionic orbits in Pb-208 are calculated with realistic pionic atom wave functions and distortion effects. The cross-sections are found to be d2sigma/dEdOMEGA approximately 10(-3) - 10(-4) mub/srMeV, which are only a small fraction of the double charge exchange background., Oct. 1992, 7, 32, 2991, 2998, Scientific journal
  • Not Refereed, CHINESE JOURNAL OF PHYSICS, PHYSICAL SOC REPUBLIC CHINA, EFFECT OF SELF-INTERACTION ON VACUUM ENERGY FOR YANG-MILLS SYSTEM IN KALUZA-KLEIN THEORY, K SHIRAISHI; S HIRENZAKI, We calculate the vacuum energy for Yang-Mills (YM) system in the background space-time M4 X S3, taking the effect of self-interaction of the YM fields into account. The compactification scale obtained by Candelas-Weinberg mechanism becomes large if the YM coupling is large. The case with an extra space S3/Z2 is also considered, and it is shown that the vacuum associated with broken gauge symmetry is unstable., Aug. 1992, 30, 4, 431, 436
  • Not Refereed, Zeitschrift für Physik C Particles and Fields, SPRINGER VERLAG, Vacuum energy for Yang-Mills fields in Rd×S1: One-loop, two-loop, and beyond, K. Shiraishi; S. Hirenzaki, The vacuum energy is calculated for Yang-Mills (YM) system defined in D dimensional space-time of S1×Rd (D=d+1), where the possibility of the YM fields to acquire the vacuum expectation values on S1 is taken into account. The vacuum energy has already been obtained to the order of one-loop in many people. Here we calculate the vacuum energy in D dimensions to two-loop order. With an intention to reach higher loops, an approximation method is proposed, which is especially effective in higher dimensions. By this method, we can treat the higher-loop contributions of YM interactions as easily as we treat one-loop effect. As a check, we show reproduction of the two-loop contribution (D-dependence of the coefficient as well as the functional form) when the coupling constant is small. This approximation method is useful not only for the Kaluza-Klein theories but also for the finite temperature-density system (as a quark-gluon plasma). © 1992 Springer-Verlag., Mar. 1992, 53, 1, 91, 96, Scientific journal
  • Not Refereed, Classical and Quantum Gravity, IOP PUBLISHING LTD, Quantum aspects of self-interacting fields around cosmic strings, K. Shiraishi; S. Hirenzaki, The authors study the quantum effect of self-interacting fields in the classical background of conical space, i.e. around a cosmic string with infinitesimal width. The renormalized value of ( phi 2) and energy-momentum tensor in the presence of cosmic strings are calculated in the self-interacting scalar field theory. The amount of condensation is also estimated in the case of the Dirac Lagrangian with the four-fermion interaction. The physical implications of the above analyses are discussed., 1992, 9, 10, 2277, 2286, Scientific journal
  • Not Refereed, INTERNATIONAL JOURNAL OF MODERN PHYSICS A, WORLD SCIENTIFIC PUBL CO PTE LTD, BOGOMOLNYI EQUATIONS FOR VORTICES IN BORN-INFELD HIGGS SYSTEMS, K SHIRAISHI; S HIRENZAKI, We study vortex solutions in the Born-Infeld theory coupled with a complex scalar field. We show that for a specific form of the "Higgs" potential the vortex satisfies a set of Bogomol'nyi-type equations. Another model, with nonlinear interaction between gauge and Higgs fields, is also considered. We show how it is derived from a supersymmetric extension of the Born-Infeld theory with a minimally coupled complex scalar field., Jun. 1991, 6, 15, 2635, 2647, Scientific journal
  • Not Refereed, Physical Review C, AMERICAN PHYSICAL SOC, (d,3He) reactions for the formation of deeply bound pionic atoms, S. Hirenzaki; H. Toki; T. Yamazaki, We have studied theoretically the proton pick-up (d,3He) reactions leading to deeply bound pionic atoms. The forward scattering cross sections for an incident energy Td=600 MeV have been calculated using the effective number approach for the Pb208 target nucleus. It was found that the pionic 2p state has the maximum cross section among all calculated states. We conclude that (d,3He) reactions produce pionic atoms in a detectable manner. © 1991 The American Physical Society., 1991, 44, 6, 2472, 2479, Scientific journal
  • Not Refereed, Nuclear Physics, Section A, ELSEVIER SCIENCE BV, Pion-transfer (n, d) and (d, 3He) reactions leading to deeply bound pionic atoms, H. Toki; S. Hirenzaki; T. Yamazaki, Theoretical studies are given on the (n, d) and (d, 3He) reactions leading to deeply bound pionic atoms in heavy nuclei of configuration [(nl)π·jn-1]J. The cross sections for various pionic and neutron-hole configurations in the case of a 208Pb target are calculated at incident energies 300-1000 MeV/u by using the effective number approach and the eikonal approximation for distortion. The effective number with a pion in the 1s or 2p state and a neutron hole in the i 13 2 orbit peaks around the same incident energy (Tn = 600 MeV) as the elementary cross section n+n→d+π-, where the momentum transfer matches the angular-momentum transfer of L = 5-7. The DWIA cross section for (n,d) producing a pion in the 1s or 2p orbit at Tn = 600 MeV is found to be around 42 or 75 μb/sr, respectively. At Tn = 350 MeV, where the momentum transfer is small, quasi-substitutional states of configurations [(2p)π(3p 1 2)n-1]L = 0 and [(2p)π(3p 3 2)n-1]L = 0 are preferentially populated with (n, d) cross sections of 95 and 190 μb/sr, respectively. The (d, 3He) cross sections are estimated to be an order of magnitude smaller than the (n, d) cross sections. Thus, the (n, d) and (d, 3He) reactions are found to be suited for the production of deeply bound pionic atoms. © 1991., 1991, 530, 3-4, 679, 697, Scientific journal
  • Not Refereed, Physical Review C, AMERICAN PHYSICAL SOC, Search for deeply bound pionic states in Pb208 using the Pb208(n,p) reaction at Tn=418 MeV, M. Iwasaki; A. Trudel; A. Celler; O. Häusser; R. S. Hayano; R. Helmer; R. Henderson; S. Hirenzaki; K. P. Jackson; Y. Kuno; N. Matsuoka; J. Mildenberger; C. A. Miller; H. Outa; H. Sakai; H. Toki; M. Vetterli; Y. Watanabe; T. Yamazaki; S. Yen, A search for deeply bound - states in heavy nuclei was undertaken using the pion-transfer Pb208(n,p) reaction at the TRIUMF CHARGEX facility. Monoenergetic 418-MeV neutrons from the Li7(p,n) reaction were used to induce (n,p) reactions on a segmented Pb208 target. The spectrum between 100- and 180-MeV excitation energy was measured with an energy resolution of 1.15 MeV (FWHM). In the region of 120140 MeV, where the deeply bound pionic states were expected, the observed spectrum exhibited a smooth continuumlike behavior with a cross section of 0.8 mb/sr MeV. This resulted in an upper limit of 0.35 mb/sr for the production cross section of - bound states in Pb208. This cross section is substantially smaller than the estimate based on the plane-wave impulse approximation, showing the importance of the effect of distortion. The distortion effect is calculated and discussed. © 1991 The American Physical Society., 1991, 43, 3, 1099, 1105, Scientific journal
  • Not Refereed, Physics Letters B, ELSEVIER SCIENCE BV, Sensitivity of deeply bound pionic atoms on the neutron skin, H. Toki; S. Hirenzaki; T. Yamazaki, A theoretical study is done to see how the properties of deeply bound pionic atoms depend on the neutron skin. With increased neutron skin, the strong isovector part of the pion-nucleus optical potential helps developing a repulsive bump at the nuclear surface which pushes the pionic wave function further out and decreases the binding energy. With further increase of the neutron skin, the repulsive potential in the central part is reduced and an inner component of the wave function develops in the nuclear interior, and ultimately a pion bounds state of large width is formed in the deeper interior for Rn-Rp≥ 0.35 fm. © 1990., 25 Oct. 1990, 249, 3-4, 391, 395, Scientific journal
  • Not Refereed, Nuclear Physics, Section B, ELSEVIER SCIENCE BV, Cosmic strings in compactified gauge theory, A. Nakamura; S. Hirenzaki; K. Shiraishi, A solution of the vortex type is given in a six-dimensional SU(2) × U(1) pure gauge theory coupled to Einstein gravity in a compactified background geometry. We construct the solution of an effective abelian Higgs model in terms of dimensional reduction. The solution, however, has a peculiarity in its physically relevant quantity, a deficit angle, which is given as a function of the ratio of the gauge couplings of SU(2) and U(1). The size of the extra space (sphere) is shown to vary with the distance from the axis of the "string". © 1990., 30 Jul. 1990, 339, 2, 533, 544, Scientific journal
  • Not Refereed, Physical Review D, AMERICAN PHYSICAL SOC, Euclidean wormhole solutions of Einstein-Yang-Mills theory in diverse dimensions, K. Yoshida; S. Hirenzaki; K. Shiraishi, We solve the Euclidean Einstein equations with non-Abelian gauge fields of sufficiently large symmetry in various dimensions. In higher-dimensional spaces, we find the solutions which are similar to so-called scalar wormholes. In four-dimensional space-time, we find singular wormhole solutions with infinite Euclidean action. Wormhole solutions in the three-dimensional Einstein-Yang-Mills theory with a Chern-Simons term are also constructed. © 1990 The American Physical Society., 1990, 42, 6, 1973, 1981, Scientific journal
  • Not Refereed, Nuclear Physics, Section A, ELSEVIER SCIENCE BV, Structure and formation of deeply-bound pionic atoms, H. Toki; S. Hirenzaki; T. Yamazaki; R. S. Hayano, We have calculated spectra of deeply-bound pionic atoms using the standard pion-nucleus optical potential. The widths of the deeply-bound states are found to be narrow and are considered as quasi-stable states even for the 1s state in 208Pb. These unexpected results are caused by the repulsive pion-nucleus optical potential which pushes the pionic wave functions outwards so that the pion absorption by the nucleus is weakened. These deeply-bound π states have hybrid character, somewhere between pionic nuclei and pionic atoms constituting a pion halo around the nucleus. This result remains relatively unchanged by the use of different optical potentials, as far as they reproduce shallow pionic atoms. We propose to produce these deeply-bound pionic atoms, hitherto untouched region, by using the "pion transfer" (n, p) reaction, where π is transferred to the target nucleus. We have calculated the cross sections for the formation of various deeply bound states via the (n, p) reaction within the framework of a plane-wave approximation. The calculated cross section increases rapidly with the nuclear charge and indicates that the detection of unexplored deeply bound pionic atoms is feasible. We comment also on the use of complex projectiles for the 'pion-transfer' reactions such as (d, 2He). © 1989., 02 Oct. 1989, 501, 4, 653, 671, Scientific journal
  • Not Refereed, Physics Letters B, ELSEVIER SCIENCE BV, Pionic atoms of unstable nuclei, S. Hirenzaki; T. Kajino; K. I. Kubo; H. Toki; I. Tanihata, High-energy heavy-ion collisions (∼GeV/N) open up a possibility to produce pionic atoms of unstable nuclei. We study the neutron number dependence of energy shifts and widths of pionic atoms in wide mass regions using standard pion-nucleus optical potentials. Two widely used optical potentials provide appreciably different results as the neutron number of deviates from the ones of stable nuclei. © 1987., 30 Jul. 1987, 194, 1, 20, 24, Scientific journal

MISC

  • 日本物理学会講演概要集, 深く束縛されたπ中間子原子で探るπN σ 項, 池野なつ美; 西隆博; 板橋健太; 野瀬-外川直子; 谷明里; 比連崎悟, Mar. 2022
  • 日本物理学会講演概要集, K 中間子ヘリウム原子の 高精度測定から考察するK中間子-原子核相互作用, 山縣淳子; 比連崎悟, Mar. 2022
  • Not Refereed, 日本物理学会講演概要集(CD-ROM), Observables of deeply bound pionic atoms and πN σ term, 池野なつ美; 比連崎悟, Sep. 2021, 76, 2
  • 日本物理学会講演概要集(CD-ROM), Residual Interaction Effects in Mesic Atoms and Mesic Nuclei, 野瀬(外川)直子; 池野なつ美; 山縣淳子; 比連崎悟, Sep. 2021, 76, 2
  • Not Refereed, Journal of Physics: Conference Series, IOP Publishing, Search for η’-mesic nuclei using (p,d) reaction with FRS/Super-FRS at GSI/FAIR, Y. K. Tanaka; S. Bagchi; J. Benlliure; T. Dickel; V. Drozd; H. Ekawa; H. Fujioka; H. Geissel; F. Goldenbaum; C. Guo; E. Haettner; M. N. Harakeh; R.S. Hayano; S. Hirenzaki; C. Hornung; Y. Igarashi; N. Ikeno; K. Itahashi; M. Iwasaki; D. Jido; N. Kalantar-Nayestanaki; R. Kanungo; B. Kindler; R. Knöbel; D. Kostyleva; N. Kurz; N. Kuzminchuk; B. Lommel; Y. Ma; S. Y. Matsumoto; V. Metag; S. Minami; P. Moskal; I. Mukha; T. Nagae; H. Nagahiro; M. Nakagawa; H. J. Ong; H. Outa; S. Pietri; W. R. Plass; A. Prochazka; S. Purushothaman; C. Rappold; J. Ritman; J.L. Rodríguez-Sánchez; R. Ruber; O. Rundel; T. R. Saito; C. Scheidenberger; R. Sekiya; V. Serdyuk; H. Simon; B. Sitar; M. Skurzok; P. Strmen; B. Sun; I. Szarka; M. Takechi; I. Tanihata; S. Terashima; H. Weick; A. Yamamoto; J. Zhao, We plan a semi-exclusive measurement of the 12C(p,dp) reaction to search for η'-mesic nuclei, aiming at investigating in-medium properties of the η′-meson. We employ a 2.5 GeV proton beam impinging on a carbon target to produce η′-mesic 11C nuclei via the 12C(p,d)η′⊗11C reaction. Using coincidence measurements of the forward going deuterons, important for missing-mass spectroscopy, and decay protons emitted from the η′-mesic nuclei. for event selection will provide a high experimental sensitivity to observe η'-mesic nuclei. We will perform the measurements by combining the WASA detector system with the fragment separator FRS at GSI and also with the Super-FRS at FAIR in the future. The plan of the experiments and the present status are reported., Dec. 2020, 1643, 1, 012181, 012181
  • Refereed, Acta Physica Polonica B, Jagiellonian University, Spectroscopy of $\eta ^{\prime }$-mesic Nuclei with WASA at GSI/FAIR, Y.K. Tanaka; S. Bagchi; J. Benlliure; T. Dickel; V. Drozd; H. Ekawa; H. Fujioka; H. Geissel; F. Goldenbaum; C. Guo; E. Haettner; M.N. Harakeh; R.S. Hayano; S. Hirenzaki; C. Hornung; Y. Igarashi; N. Ikeno; K. Itahashi; M. Iwasaki; D. Jido; N. Kalantar-Nayestanaki; R. Kanungo; B. Kindler; R. Knöbel; D. Kostyleva; N. Kurz; N. Kuzminchuk; B. Lommel; Y. Ma; S.Y. Matsumoto; V. Metag; S. Minami; P. Moskal; I. Mukha; T. Nagae; H. Nagahiro; M. Nakagawa; H.J. Ong; H. Outa; S. Pietri; W.R. Plass; A. Prochazka; S. Purushothaman; C. Rappold; J. Ritman; J.L. Rodríguez-Sánchez; R. Ruber; O. Rundel; T.R. Saito; C. Scheidenberger; R. Sekiya; V. Serdyuk; H. Simon; B. Sitar; M. Skurzok; P. Strmen; B. Sun; I. Szarka; M. Takechi; I. Tanihata; S. Terashima; H. Weick; A. Yamamoto; J. Zhao, We plan to conduct an experimental search for η -mesic nuclei in order to investigate in-medium properties of the η meson. A 2.5 GeV proton beam is employed to produce η -mesic C nuclei with the C(p,d)η C reaction. Simultaneous measurements of the forward ejected deuterons and decay protons from η -mesic nuclei will allow us to achieve high experimental sensitivity. The experiment will be performed at GSI by making full use of the fragment separator FRS and the WASA detector system. The plan of this proposed experiment is described. 0 0 0 11 12 0⊗ 11 0, 2020, 51, 1, 39, 39
  • Refereed, Acta Physica Polonica B, Jagiellonian University, Nuclear Deformation Effects to the Formation Cross Section of $\eta '$ Mesic Nucleus, S. Kinutani; M. Hirao; H. Nagahiro; S. Hirenzaki, We study the nuclear deformation effects to the formation spectrum of the η0-mesic nucleus theoretically. We find that the deformation effects could significantly change the spectrum shape and the effects should be considered appropriately., 2020, 51, 1, 333, 333
  • 日本物理学会講演概要集(CD-ROM), Nuclear compression effects in the mesic nucleus formation reaction, 絹谷すずな; 平尾まい; 永廣秀子; 慈道大介; 比連崎悟, 2020, 75, 1
  • Not Refereed, CENTRAL EUROPEAN SYMPOSIUM ON THERMOPHYSICS 2019 (CEST), AIP Publishing, K̄ and nucleus system studied by 12C(K−, p) spectrum, Yudai Ichikawa; Junko Yamagata-Sekihara; Jung Keun Ahn; Yuya Akazawa; Kanae Aoki; Elena Bottta; Hiroyuki Ekawa; Petr Evtoukhovitch; Alessandro Feliciello; Manami Fujita; Toshiyuki Gogami; Shoichi Hasegawa; Tomoyuki Hasegawa; Shuhei Hayakawa; Tomonori Hayakawa; Satoru Hirenzaki; Ryotaro Honda; Kenji Hosomi; Ken’ichi Imai; Wooseung Jung; Shunsuke Kanatsuki; Shinhyung Kim; Sinji Kinbara; Kazuya Kobayashi; Jaeyong Lee; Simonetta Marcello; Koji Miwa; Taejin Moon; Tomofumi Nagae; Yoshiyuki Nakada; Manami Nakagawa; Takuya Nanamura; Megumi Naruki; Atsushi Sakaguchi; Hiroyuki Sako; Susumu Sato; Yuki Sasaki; Kotaro Shirotori; Hitoshi Sugimura; Toshiyuki Takahashi; Hirokazu Tamura; Kiyoshi Tanida; Zviadi Tsamalaidze; Mifuyu Ukai; Takeshi. O. Yamamoto, We have measured an inclusive missing-mass spectrum of the C-12(K-, p) reaction over wide energy region at the kaon incident momentum of 1.8 GeV/c at J-PARC K1.8 beam line. This measurement was carried out as a by-product of a pilot run of J-PARC E05 experiment, which searched for the Xi-hypernuclei via C-12(K-, K+) reaction. We have compared the observed missing-mass spectrum with a DWIA calculation to study the (K) over bar -nucleus interaction. In this comparison, we have changed the depth of both real and imaginary parts of the optical potential between the (K) over bar and nucleus. It is found that the observed spectrum is best reproduced by the calculation of the potential depth of V-0 similar to -80 MeV (real part) and W-0 similar to -40 MeV (imaginary part). On the other hand, we have observed a definitive excess around the deeply bound region B-K greater than or similar to 100 MeV. The excess cannot be explained by the any optical potential and quasi-free background reaction. It is well fitted with a Breit-Wigner function with a binding energy of 90 MeV and a width of 100 MeV, which can be interpreted as a deeply bound Lambda(1405) nucleus., 2019, 2130
  • 日本物理学会講演概要集(CD-ROM), (p,d)反応によるη(958)中間子原子核生成における核変形の効果, 絹谷すずな; 平尾まい; 永廣秀子; 比連崎悟, 2019, 74, 1
  • 日本物理学会講演概要集(CD-ROM), K中間子原子エネルギースペクトルにおける斥力シフトの起源, 飯澤優太朗; 飯澤優太朗; 慈道大介; 慈道大介; 池野なつ美; 山縣淳子; 比連崎悟, 2019, 74, 1
  • 日本物理学会講演概要集(CD-ROM), 反陽子原子からの中間子-原子核束縛状態生成, 平尾まい; 絹谷すずな; 永廣秀子; 板橋健太; 比連崎悟, 2019, 74, 2
  • 日本物理学会講演概要集(CD-ROM), 相対論的平均場原子核理論によるη’中間子原子核の質量スペクトル, 慈道大介; 桝谷花世; 比連崎悟, 2019, 74, 2
  • 日本物理学会講演概要集(CD-ROM), K中間子原子における斥力シフトと非線形光学ポテンシャル, 飯澤優太朗; 飯澤優太朗; 慈道大介; 慈道大介; 池野なつ美; 山縣淳子; 比連崎悟, 2019, 74, 2
  • 日本物理学会講演概要集(CD-ROM), 核変形効果を考慮したη(958)中間子原子核の(p,d)反応による生成スペクトル, 絹谷すずな; 平尾まい; 永廣秀子; 慈道大介; 比連崎悟, 2019, 74, 2
  • 日本物理学会講演概要集(CD-ROM), ダブルπ中間子原子の構造, 谷明里; 池野なつ美; 池野なつ美; 比連崎悟; 慈道大介; 永廣秀子; 永廣秀子; 藤岡宏之; 板橋健太, 2019, 74, 2
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, η'(958) mesic nucleus with coupled-channel calculation, Kawamoto Ayano; Nagahiro Hideko; Hirenzaki Satoru, 2018, 73, 0, 293, 293
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, Pion wavefunction renormalization effects to the structure and formation of deeply bound pionic atoms, Ikeno Natsumi; Aoki Kenji; Jido Daisuke; Hirenzaki Satoru, 2018, 73, 0, 292, 292
  • 日本物理学会講演概要集(CD-ROM), 理化学研究所における(d,3He)反応を用いたパイ中間子原子の分光実験, 西隆博; AHN DeukSoon; BERG Georg P.A.; 堂園昌伯; 藤岡宏之; 福田直樹; 福西暢尚; GEISSEL Hans; HAETTNER Emma; 橋本直; 早野龍五; 比連崎悟; 堀井啓志; 池野なつ美; 稲辺尚人; 板橋健太; 伊藤聖; 岩崎雅彦; 亀田大輔; 川瀬頌一郎; 木佐森慶一; 清川裕; 久保敏幸; 日下健祐; 松原礼明; 松下昌史; 道正新一郎; 三木謙二郎; 三嶋剛; 宮裕之; 村井大地; 村上洋平; 永廣秀子; 中村祐喜; 新倉潤; 野地俊平; 大河内公太; 大田晋輔; 坂本成彦; 関口仁子; 鈴木宏; 鈴木謙; 高木基伸; 竹田浩之; 田中良樹; 轟孔一; 塚田暁; 上坂友洋; 渡辺珠以; WEICK Helmut; 山田裕之; 山上大貴; 柳澤善行; 吉田光一, 2018, 73, 1
  • 教育システム研究(奈良女子大学教育システム研究開発センター), 奈良女子大学教育システム研究開発センター, 高等学校物理の単元「放物運動」におけるコンピュータシュミレーションを用いた授業, 米田 隆恒; 狐崎 創; 比連崎 悟; 比連崎 悟, Oct. 2017, 別冊, 0, 115, 118
  • 教育システム研究(奈良女子大学教育システム研究開発センター), 奈良女子大学教育システム研究開発センター, 求積法の変遷を探る学習:高等学校数学科授業の多角的観点からの検討, 佐藤 大典; 篠田 正人; 梅垣 由美子; 比連崎 悟, Oct. 2017, 0, 95, 100
  • Refereed, Acta Physica Polonica B, First results on the experimental search for η′-mesic nuclei with the 12C(p, d) reaction, Y. K. Tanaka; Y. Ayyad; J. Benlliure; K. T. Brinkmann; S. Friedrich; H. Fujioka; H. Geissel; J. Gellanki; C. Guo; E. Gutz; E. Haettner; M. N. Harakeh; R. S. Hayano; Y. Higashi; S. Hirenzaki; C. Hornung; Y. Igarashi; N. Ikeno; K. Itahashi; M. Iwasaki; D. Jido; N. Kalantar-Nayestanaki; R. Kanungo; R. Knöbel; N. Kurz; V. Metag; I. Mukha; T. Nagae; H. Nagahiro; M. Nanova; T. Nishi; H. J. Ong; S. Pietri; A. Prochazka; C. Rappold; M. P. Reiter; J. L. Rodríguez-Sánchez; C. Scheidenberger; H. Simon; B. Sitar; P. Strmen; B. Sun; K. Suzuki; I. Szarka; M. Takechi; I. Tanihata; S. Terashima; Y. N. Watanabe; H. Weick; E. Widmann; J. S. Winfield; X. Xu; H. Yamakami; J. Zhao, We performed a missing-mass spectroscopy experiment of the 12C(p, d) reaction in order to search for η′-mesic nuclei. Excitation spectrum of 11C around the η′-meson production threshold was successfully obtained with a high-statistical sensitivity and sufficiently good energy resolution. Since no peak structure associated with the formation of η′-mesic nuclei was observed, we set constraints on the formation cross sections of η′-mesic states and on the η′-nucleus interaction., Oct. 2017, 48, 10, 1813, 1818
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, Energy dependence of η'(958) mesic nucleus optical potential, Kawamoto Ayano; Nagahiro Hideko; Hirenzaki Satoru, 2017, 72, 0, 179, 179
  • Not Refereed, Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, η' mesonic nuclei in a relativistic mean-field theory, Masutani Hanayo; Jido Daisuke; Satoru Hirenzaki, 2017, 72, 0, 180, 180
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, Effects of higher partial waves to pion wavefunction renormalization in nuclear medium, Aoki K.; Jido D.; Ikeno N.; Hirenzaki S., 2017, 72, 0, 181, 181
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, η-nucleus interaction from the d + d reaction around the η production threshold, Ikeno N.; Nagahiro H.; Jido D.; Hirenzaki S.,

    η中間子原子核生成を目指して、COSY(ドイツ)において2つの重陽子の衝突実験が行われた。η中間子の生成閾値付近で、3He+N+π、の終状態が観測され、η中間子原子核生成断面積の上限値が報告されている。本講演では、この実験結果を理論的に解析し、η中間子と原子核(α 粒子)の間の相互作用についてどのような新しい情報(制限)が得られるかを報告する予定である。

    , 2017, 72, 0, 209, 209
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, eta'(958)-nucleon interaction by coupled channel calculation, Kawamoto Ayano; Nagahiro Hideko; Hirenzaki Satoru,

    本研究では、η'中間子と原子核の間のポテンシャルを導出することを目的として、η'N間の散乱についての研究を行う。具体的には、擬スカラー中間子-バリオンの系、ベクトル中間子-バリオンの系を考慮した結合チャネル法を用いて実験値と比較する。その際我々はシングレットのηと核子間の相互作用を導入して、その大きさの決定を試みる。また、中間子核子間に動的に生成されるいくつかの共鳴状態について調べ、どのような共鳴がη'Nチャネルへ強く結合するか議論する。

    , 2017, 72, 0, 210, 210
  • Refereed, Acta Physica Polonica B, Jagiellonian University, $\eta $--Nucleus Interaction from the $d + d$ Reaction Around the $\eta $-Production Threshold, S. Hirenzaki; N. Ikeno, We have developed a theoretical model to evaluate the formation rate of the η-mesic nucleus in the d+d fusion reaction and show the calculated results. We have compared our results with existing data of the d + d → η + α., 2017, 48, 10, 1787, 1787
  • 日本物理学会講演概要集(CD-ROM), 相対論的平均場理論によるη′中間子原子核, 桝谷花世; 慈道大介; 比連崎悟, 2017, 72, 2
  • Not Refereed, EPJ Web of Conferences, EDP Sciences, Precision spectroscopy of pionic atoms and chiral symmetry in nuclei, Kenta Itahashi; Deuksoon Ahn; Georg P.A. Berg; Masanori Dozono; Daijiro Etoh; Hiroyuki Fujioka; Naoki Fukuda; Nobuhisa Fukunishi; Hans Geissel; Emma Haettner; Tadashi Hashimoto; Ryugo S. Hayano; Satoru Hirenzaki; Hiroshi Horii; Natsumi Ikeno; Naoto Inabe; Masahiko Iwasaki; Daisuke Kameda; Shouichiro Kawase; Keiichi Kisamori; Yu Kiyokawa; Toshiyuki Kubo; Kensuke Kusaka; Masafumi Matsushita; Shin'Ichiro Michimasa; Go Mishima; Hiroyuki Miya; Daichi Murai; Hideko Nagahiro; Takahiro Nishi; Shinsuke Ota; Naruhiko Sakamoto; Kimiko Sekiguchi; Hiroshi Suzuki; Ken Suzuki; Motonobu Takaki; Hiroyuki Takeda; Yoshiki K. Tanaka; Tomohiro Uesaka; Yasumori Wada; Yuni N. Watanabe; Helmut Weick; Hiroki Yamakami; Yoshiyuki Yanagisawa; Koichi Yoshida, © The Authors, published by EDP Sciences, 2016. We conduct an experimental project to make spectroscopy of deeply bound pionic atoms systematically over wide range of nuclei. We aim at studying the strong interaction in the low energy region, which has close connection to spontaneous chiral symmetry breaking and its partial restoration in nuclear matter. First experimental results show improved spectral resolution and much better statistical sensitivity than previous experiments. Present status of the experiment is reported., 29 Nov. 2016, 130
  • Not Refereed, EPJ Web of Conferences, E D P SCIENCES, Search for η ′ mesic nuclei by missing-mass spectroscopy of the 12C(p, d) reaction, Yoshiki K. Tanaka; Yassid Ayyad; Jose Benlliure; Kai Thomas Brinkmann; Stefan Friedrich; Hiroyuki Fujioka; Hans Geissel; Jnaneswari Gellanki; Chenlei Guo; Eric Gutz; Emma Haettner; Muhsin N. Harakeh; Ryugo S. Hayano; Yuko Higashi; Satoru Hirenzaki; Christine Hornung; Yoichi Igarashi; Natsumi Ikeno; Kenta Itahashi; Masahiko Iwasaki; Daisuke Jido; Nasser Kalantar-Nayestanaki; Rituparna Kanungo; Ronja Knoebel; Nikolaus Kurz; Volker Metag; Ivan Mukha; Tomofumi Nagae; Hideko Nagahiro; Mariana Nanova; Takahiro Nishi; Hooi Jin Ong; Stephane Pietri; Andrej Prochazka; Christophe Rappold; Moritz P. Reiter; Jose Luis Rodríguez Sánchez; Christoph Scheidenberger; Haik Simon; Branislav Sitar; Peter Strmen; Baohua Sun; Ken Suzuki; Imrich Szarka; Maya Takechi; Isao Tanihata; Satoru Terashima; Yuni N. Watanabe; Helmut Weick; Eberhard Widmann; John S. Winfield; Xiaodong Xu; Hiroki Yamakami; Jianwei Zhao, © The Authors, published by EDP Sciences, 2016. We performed a missing-mass spectroscopy experiment of the 12C(p, d) reaction at 2.5 GeV proton energy in order to search for η′ mesic nuclei. An excitation-energy spectrum of 11C was obtained around the η′ production threshold. As no significant peak structure was observed in the spectrum, upper limits of the formation cross section of η′ mesic nuclei have been determined. Preliminary results of the experiment as well as future prospects are given., 29 Nov. 2016, 130
  • Not Refereed, Acta Physica Polonica B, JAGIELLONIAN UNIV PRESS, Formation of η′(958) bound states by (γ,d) reaction, M. Miyatani; H. Nagahiro; S. Hirenzaki; N. Ikeno, We have investigated the 6Li(γ, d) reaction theoretically for the formation of the η′(958) mesic nucleus. We have reported the numerical results in this article., Feb. 2016, 47, 2, 367, 371
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 22pAC-5 A phenomenological study of the in-medium properties of φ meson, Tokunaga S.; Yamagata-Sekihara J.; Nagahiro H.; Hirenzaki S., 2016, 71, 0, 265, 265
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 22pAC-7 Formation of η'(958) bound states by (γ,d) reaction, Miyatani M.; Ikeno N.; Nagahiro H.; Hirenzaki S., 2016, 71, 0, 266, 266
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 22pAC-8 Spectroscopy of eta' mesic nuclei with the ^<12>C(p, d) reaction at GSI, Tanaka Y. K.; Gutz E.; Haettner E.; Harakeh M. N.; Hayano R. S.; Higashi Y.; Hirenzaki S.; Hornung C.; Igarashi Y.; Ikeno N.; Itahashi K.; Ayyad Y.; Iwasaki M.; Jido D.; Kalantar-Nayestanaki N.; Kanungo R.; Knoebel R.; Kurz N.; Metag V.; Mukha I.; Nagae T.; Nagahiro H.; Benlliure J.; Nanova M.; Nishi T.; Ong H. J.; Pietri S.; Prochazka A.; Rappold C.; Reiter M. P.; Sanchez J. L. R.; Scheidenberger C.; Simon H.; Brinkmann K.-T.; Sitar B.; Strmen P.; Sun B.; Suzuki K.; Szarka I.; Takechi M.; Tanihata I.; Terashima S.; Watanabe; Weick H.; Friedrich S.; Widmann E.; Winfield J. S.; Xu X.; Yamakami H.; Zhao J.; Fujioka H.; Geissel H.; Gellanki J.; Guo C., 2016, 71, 0, 267, 267
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 19pAW-3 Structure and Formation of Meson-Nucleus Bound States, Hirenzaki Satoru, 2016, 71, 0, 298, 299
  • Refereed, Hyperfine Interactions, SPRINGER, Spectroscopy of η′-nucleus bound states at GSI and FAIR — very preliminary results and future prospects —, H. Fujioka; Y. Ayyad; J. Benlliure; K. T. Brinkmann; S. Friedrich; H. Geissel; J. Gellanki; C. Guo; E. Gutz; E. Haettner; M. N. Harakeh; R. S. Hayano; Y. Higashi; S. Hirenzaki; C. Hornung; Y. Igarashi; N. Ikeno; K. Itahashi; M. Iwasaki; D. Jido; N. Kalantar-Nayestanaki; R. Kanungo; R. Knoebel; N. Kurz; V. Metag; I. Mukha; T. Nagae; H. Nagahiro; M. Nanova; T. Nishi; H. J. Ong; S. Pietri; A. Prochazka; C. Rappold; M. P. Reiter; J. L. Rodríguez-Sánchez; C. Scheidenberger; H. Simon; B. Sitar; P. Strmen; B. Sun; K. Suzuki; I. Szarka; M. Takechi; Y. K. Tanaka; I. Tanihata; S. Terashima; Y. N. Watanabe; H. Weick; E. Widmann; J. S. Winfield; X. Xu; H. Yamakami; J. Zhao, © 2015, Springer International Publishing Switzerland. The possible existence of η′-nucleus bound states has been put forward through theoretical and experimental studies. It is strongly related to the η′ mass at finite density, which is expected to be reduced because of the interplay between the UA(1) anomaly and partial restoration of chiral symmetry. The investigation of the C(p,d) reaction at GSI and FAIR, as well as an overview of the experimental program at GSI and future plans at FAIR are discussed., 07 Aug. 2015, 234, 1-3, 33, 39
  • Refereed, Acta Physica Polonica B, WYDAWNICTWO UNIWERSYTETU JAGIELLONSKIEGO, Exotic atoms and exotic nuclei, S. Hirenzaki; H. Nagahiro; N. Ikeno; J. Yamagata-Sekihara, © 2015 ACTA PHYSICA POLONICA B. In this article, we briefly review the study of the exotic atoms and exotic nuclei, and report on recent research activities of η-mesic nucleus and kaonic atoms., 01 Jan. 2015, 46, 1, 121, 126
  • Refereed, Acta Physica Polonica B, Search for η′(958)-nucleus bound states by (p; d) reaction at GSI and FAIR, H. Fujioka; Y. Ayyad; J. Benlliure; K. T. Brinkmann; S. Friedrich; H. Geissel; J. Gellanki; C. Guo; E. Gutz; E. Haettner; M. N. Harakeh; R. S. Hayano; Y. Higashi; S. Hirenzaki; C. Hornung; Y. Igarashi; N. Ikeno; K. Itahashi; M. Iwasaki; D. Jido; N. Kalantar-Nayestanaki; R. Kanungo; R. Knoebel; N. Kurz; V. Metag; I. Mukha; T. Nagae; H. Nagahiro; M. Nanova; T. Nishi; H. J. Ong; S. Pietri; A. Prochazka; C. Rappold; M. P. Reiter; J. L. Rodríguez-Sánchez; C. Scheidenberger; H. Simon; B. Sitar; P. Strmen; B. Sun; K. Suzuki; I. Szarka; M. Takechi; Y. K. Tanaka; I. Tanihata; S. Terashima; Y. N. Watanabe; H. Weick; E. Widmann; J. S. Winfield; X. Xu; H. Yamakami; J. Zhao, © 2015 ACTA PHYSICA POLONICA B. The mass of the η′ meson is theoretically expected to be reduced at finite density, which indicates the existence of η′-nucleus bound states. To investigate these states, we perform missing-mass spectroscopy for the (p; d) reaction near the η′ production threshold. The overview of the experimental situation is given and the current status is discussed., 01 Jan. 2015, 46, 1, 127, 132
  • Not Refereed, Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 21pCC-1 Search for η' mesic nuclei by spectroscopy of (p,d) reaction, Tanaka Y. K.; Gutz E.; Haettner E.; Harakeh M. N.; Hayano R. S.; Higashi Y.; Hirenzaki S.; Hornung C.; Igarashi Y.; Ikeno N.; Itahashi K.; Ayyad Y.; Iwasaki M.; Jido D.; Kalantar-Nayestanaki N.; Kanungo R.; Knoebel R.; Kurz N.; Metag V.; Mukha I.; Nagae T.; Nagahiro H.; Benlliure J.; Nanova M.; Nishi T.; Ong H. J.; Pietri S.; Prochazka A.; Rappold C.; Reiter M. P.; Sanchez J. L. R.; Scheidenberger C.; Simon H.; Brinkmann K.-T.; Sitar B.; Strmen P.; Sun B.; Suzuki K.; Szarka I.; Takechi M.; Tanihata I.; Terashima S.; Watanabe Y. N.; Weick H.; Friedrich S.; Widmann E.; Winfield J. S.; Xu X.; Yamakami H.; Zhao J.; Fujioka H.; Geissel H.; Gellanki J.; Guo C., 2015, 70, 0, 281, 281
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 21pCC-5 In-medium properties of φ meson and observables, Tokunaga S.; Yamagata-Sekihara J.; Nagahiro H.; Hirenzaki S., 2015, 70, 0, 284, 284
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 21pCC-2 Formation of η(958) mesic nucleus by two-nucleon transfer reaction, Miyatani M.; Ikeno N.; Nagahiro H.; Hirenzaki S., 2015, 70, 0, 282, 282
  • 原子核研究, η’生成領域における12C(p,d)反応の微視的輸送模型(JAM)による解析, 東裕子; 池野なつ美; 池野なつ美; 永廣秀子; 比連崎悟; 藤岡宏之; 板橋健太; 田中良樹, 2015, 59, Supplement 1
  • 原子核研究, 中間子-原子核系で探る核内中間子の性質と強い相互作用の対称性, 比連崎悟; 池野なつ美; 池野なつ美; 永廣秀子, 2015, 59, Supplement 1
  • Not Refereed, Proceedings of the 12th Asia Pacific Physics Conference (APPC12), Journal of the Physical Society of Japan, Formation of Deeply Bound Pionic Atoms in the (d,3He) Reaction, Natsumi Ikeno; Junko Yamagata-Sekihara; Hideko Nagahiro; Satoru Hirenzaki, 26 Mar. 2014
  • Refereed, ACTA PHYSICA POLONICA B, JAGIELLONIAN UNIV PRESS, MESON PROPERTIES AT FINITE DENSITY FROM MESIC ATOMS AND MESIC NUCLEI, Satoru Hirenzaki; Hideko Nagahiro, The properties of eta'(958) meson at finite nuclear density is considered to have close connection with the effects of U-A(1) anomaly at finite density. In this context, we are very much interested in the study of the eta'(958)mesic nuclei. As for the eta-mesic nuclei, which have been studied for a long time, we think it is interesting and important to consider both effects of the coupling of eta N system to N*(1535) and of the mixing of eta with eta'(958). In this article, we briefly summarize recent results of our studies concerning with eta'(958)- and eta-mesic nuclei., Mar. 2014, 45, 3, 619, 625
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 27aTB-5 Precise Studies of Pion Properties in Nuclei from Deeply Bound Pionic Atoms, Ikeno N.; Yamagata-Sekihara J.; Nagahiro H.; Hirenzaki S., 2014, 69, 0, 45, 45
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 30aTA-3 Spectroscopy of η'-mesic nuclei at Super-FRS/FAIR, Fujioka Hiroyuki; Hayano Ryugo S.; Watanabe Yuni N.; Igarashi Yoichi; Ikeno Natsumi; Nagahiro Hideko; Higashi Yuko; Hirenzaki Satoru; Jido Daisuke; Geissel Hans; Weick Helmut; Nagae Tomofumi; Brinkmann Kai-Thomas; Friedrich Stefan; Metag Volker; Nanova Mariana; Suzuki Ken; Yamakami Hiroki; Itahashi Kenta; Iwasaki Masahiko; Outa Haruhiko; Suzuki Takatoshi; Tanaka Yoshiki K.; Nishi Takahiro, 2014, 69, 0, 101, 101
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 30aTA-4 An analysis of the ^<12>C(p,d) reaction at η' meson prodution region by microscopic transport model (JAM), Higashi Y.; Ikeno N.; Nagahiro H.; Hirenzaki S.; Fujioka H.; Itahashi K.; Tanaka Y.K., 2014, 69, 0, 101, 101
  • Refereed, EPJ Web of Conferences, E D P SCIENCES, Meson properties from mesic atoms and mesic nuclei, Satoru Hirenzaki; Natsumi Ikeno; Hideko Nagahiro; Yuko Higashi, © Owned by the authors, published by EDP Sciences, 2014. Meson properties are believed to have close connection to the fundamental theory, QCD, and have been studied for a long time both theoretically and experimentally. In this report, we study the recent activities in this field and consider the η(958) mesic nuclei and the deeply bound pionic atoms. We summarize the possible formation of the η(958) mesic nuclei by the (p, d) reactions and report the new possibilities of the spectroscopic study of the pionic atoms using the (d,3He) reactions., 2014, 81
  • Refereed, JPS Conf.Proc., Formation of $\eta′$(958) Bound States in Nuclei, Hirenzaki Satoru; Nagahiro Hideko; Jido Daisuke, 2014, 1, 013030
  • Refereed, EPJ Web of Conferences, E D P SCIENCES, Missing mass spectroscopy of η ′ mesic nuclei with the (p,d) reaction at GSI, Yoshiki K. Tanaka; Kai Thomas Brinkmann; Stefan Friedrich; Hiroyuki Fujioka; Hans Geissel; Ryugo S. Hayano; Satoru Hirenzaki; Kenta Itahashi; Satoshi Itoh; Daisuke Jido; Volker Metag; Hideko Nagahiro; Mariana Nanova; Takahiro Nishi; Kota Okochi; Haruhiko Outa; Ken Suzuki; Takatoshi Suzuki; Yuni N. Watanabe; Helmut Weick, We plan a missing-mass spectroscopy experiment of η′ mesic nuclei with the 12C(p,d)η′ 11C reaction to study in-medium properties of the η′ meson. In nuclear medium, due to restoration of chiral symmetry, the mass of the η′ meson may be reduced, and η′ bound states in a nucleus may exist. The experiment will be started at GSI with a 2.5 GeV proton beam using FRS as a spectrometer and will be continued at Super-FRS at FAIR. The plan of the experiment and development of a Cherenkov detector and an optics mode are described. © Owned by the authors, published by EDP Sciences, 2013., 2014, 66, 09019
  • Refereed, EPJ Web of Conferences, Spectroscopy of η ′ Mesic nuclei via semi-exclusive measurement at FAIR, Hiroyuki Fujioka; Kai Thomas Brinkmann; Stefan Friedrich; Hans Geissel; Ryugo S. Hayano; Satoru Hirenzaki; Kenta Itahashi; Satoshi Itoh; Daisuke Jido; Volker Metag; Hideko Nagahiro; Mariana Nanova; Takahiro Nishi; Kota Okochi; Haruhiko Outa; Ken Suzuki; Takatoshi Suzuki; Yoshiki K. Tanaka; Yuni N. Watanabe; Helmut Weick, In order to investigate a possible mass reduction of an η′ meson at finite density, a series of missing-mass spectroscopy experiments of η′-nucleus bound states with the 12C(p,d) reaction is planned at GSI and FAIR. A semi-exclusive measurement with the tagging of protons from η′ two-body absorption (η′NN → NN) will be a key feature in an experiment with Super-FRS at FAIR. © Owned by the authors, published by EDP Sciences, 2013., 2014, 66, 09006
  • 日本物理学会講演概要集, η’生成領域における12C(p,d)反応の微視的輸送模型(JAM)による解析, 東裕子; 池野なつ美; 永廣秀子; 比連崎悟; 藤岡宏之; 板橋健太; 田中良樹, 2014, 69, 1
  • Refereed, Nuclear Physics A, ELSEVIER SCIENCE BV, Nuclear density probed by anti-kaon-nucleus systems and anti-kaon-nucleus interaction, J. Yamagata-Sekihara; N. Ikeno; H. Nagahiro; D. Jido; S. Hirenzaki, Effective nuclear densities probed by anti-kaon-nucleus systems is studied theoretically both for bound and low energy scattering states. As for the bound states, we investigate kaonic atoms. We find that the effective density depends on the atomic states significantly and we have the possibility to obtain the anti-kaon properties at various nuclear densities by observing the several kaonic atom states. We also find the energy dependence of the probed density by scattering states. We find that the study of the effective nuclear density will help to find the proper systems to investigate the meson properties at various nuclear densities. © 2013 Elsevier B.V., Sep. 2013, 914, 344, 348
  • Refereed, NUCLEAR PHYSICS A, ELSEVIER SCIENCE BV, eta ' meson under partial restoration of chiral symmetry in nuclear medium, Daisuke Jido; Shuntaro Sakai; Hideko Nagahiro; Satoru Hirenzaki; Natsumi Ikeno, In-medium modification of the eta' mass is discussed in the context of partial restoration of chiral symmetry in nuclear medium. We emphasize that the U-A (1) anomaly effects cause the eta'-eta mass difference necessarily through the chiral symmetry breaking. As a consequence, the eta' mass is expected to be reduced by order of 100 MeV in nuclear matter where about 30% reduction of chiral symmetry takes place. The strong attraction relating to the eta' mass generation eventually implies that there should be also a strong attractive interaction in the scalar channel of the eta'-N two-body system. We find that the attraction can be strong enough to form a bound state. (C) 2012 Elsevier B.V. All rights reserved., Sep. 2013, 914, 354, 359
  • Refereed, Few-Body Systems, SPRINGER WIEN, Formation of Deeply Bound Pionic Atoms in Sn Isotopes, Natsumi Ikeno; Hideko Nagahiro; Satoru Hirenzaki, We study the formation of deeply bound pionic atoms in the (d,3He) reaction theoretically. At different scattering angles, we find that the different subcomponents dominate the formation spectra because of the matching condition of the reaction. We also find that the pionic 1s state which is free from the residual interaction effects appears clearly in 117Sn(d, 3He) spectra. We conclude that the observation of the (d,3He) reaction for these new cases will provide more systematic and accurate information on the pionic bound states, and it will help to develop the study of the pion properties and the partial restoration of chiral symmetry in nuclei. © 2013 Springer-Verlag Wien., Aug. 2013, 54, 7-10, 1573, 1576
  • Refereed, Few-Body Systems, SPRINGER WIEN, First Precision Spectroscopy of Pionic Atoms at RI Beam Factory, Kenta Itahashi; Georg P.A. Berg; Hiroyuki Fujioka; Hans Geissel; Ryugo S. Hayano; Satoru Hirenzaki; Natsumi Ikeno; Naohito Inabe; Satoshi Itoh; Daisuke Kameda; Toshiyuki Kubo; Hiroaki Matsubara; Shinichiro Michimasa; Kenjiro Miki; Hiroyuki Miya; Masaki Nakamura; Takahiro Nishi; Shumpei Noji; Shinsuke Ota; Ken Suzuki; Hiroyuki Takeda; Koichi Todoroki; Kyo Tsukada; Tomohiro Uesaka; Helmut Weick; Koichi Yoshida, We conducted an inclusive missing-mass spectroscopy of 122Sn (d, 3He) reaction near the π- emission threshold at an incident energy of T d = 250 MeV/nucleon. The experiment sets its goals to the research and development of the high precision spectroscopy of pionic atoms at the RI beam factory (RIBF) of RIKEN, which precedes a new project, pionic atom factory project (piAF), to observe pionic atoms systematically. Here, we report the preliminary results of the pilot experiment. © 2013 Springer-Verlag Wien., Aug. 2013, 54, 7-10, 1569, 1572
  • Refereed, Few-Body Systems, SPRINGER WIEN, Spectroscopy of η′ Mesic Nuclei with (p, d) Reaction, Yoshiki K. Tanaka; Stefan Friedrich; Hiroyuki Fujioka; Hans Geissel; Ryugo S. Hayano; Satoru Hirenzaki; Kenta Itahashi; Satoshi Itoh; Daisuke Jido; Volker Metag; Hideko Nagahiro; Mariana Nanova; Takahiro Nishi; Kota Okochi; Haruhiko Outa; Ken Suzuki; Takatoshi Suzuki; Helmut Weick, We are going to perform an inclusive spectroscopy experiment of η′ mesic nuclei with the 12C(p,d) reaction to study in-medium properties of the η′ meson. In nuclear medium, the η′ meson mass may be reduced due to partial restoration of chiral symmetry. In case of sufficiently large mass reduction and small absorption width of η′ at normal nuclear density, peak structures of η′ mesic states in 11C will be observed near the η′ emission threshold even in an inclusive spectrum. The experiment will be carried out at GSI with proton beam supplied by SIS using FRS as a spectrometer. The detail of the experiment is described. © 2013 Springer-Verlag Wien., Aug. 2013, 54, 7-10, 1263, 1266
  • Proceedings of Science, Spectroscopy of ′η mesic nuclei using (p, d) reaction, K. Suzuki; K. T. Brinkmann; S. Friedrich; V. Metag; M. Nanova; H. Fujioka; T. Nagae; H. Yamakami; H. Geissel; H. Weick; R. S. Hayano; T. Nishi; T. Suzuki; Y. K. Tanaka; Y. N. Watanabe; Y. Igarashi; Y. Higashi; S. Hirenzaki; N. Ikeno; H. Nagahiro; D. Jido; H. Outa; M. Iwasaki; K. Itahashi, © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence. The h-PRiME collaboration (Japan-Germany-Austria) searches for h0(958) meson-nucleus bound states. The mass of the h0 meson is much greater than the values if it were a pure Goldstone boson associated with spontaneously broken chiral symmetry. The extra mass is to be attributed to non-perturbative gluon dynamics and the QCD axial anomaly. The h0 in media will be influenced through chiral restoration and the axial U(1) dynamics, causing accordingly a sizable mass reduction and a strong binding to the nucleus, on which an observation of such states will provide valued information. The data taking (S437 experiment) using inclusive missing mass spectroscopy of (p;d) reaction off carbon target will take place in summer 2014 at the FRS spectrometer at GSI., 2013
  • Proceedings of Science, Meson properties at finite density from mesic atoms and mesic nuclei = Recent topics on φ and η′(958) in nuclei =, Satoru Hirenzaki; Natsumi Ikeno; Hideko Nagahiro, © owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence. We study the meson-nucleus systems as the very interesting objects to deduce the hadron properties precisely and to obtain new information on the aspects of the strong interaction at finite density. We briefly introduce the recent research activities on pionic atoms and η′ (958) mesic nuclei in this article. The (d,3 He) reactions for the formation of the pionic atoms are considered at finite angles and on the odd-neutron nuclear targets to develop the systematic and accurate studies of the pion properties at various nuclear densities. η′ (958)-nucleus systems are quite interesting in the context of the effects of the UA(1) anomaly at finite density. The possible formation of the nuclear bound states of the η′meson by the (p,d) reactions is discussed to deduce the information on the mass shift of the exceptionally heavy η′meson., 2013
  • Refereed, Proceedings of Science, Formation of deeply bound pionic atoms and pion properties in nuclei, Natsumi Ikeno; Junko Yamagata-Sekihara; Hideko Nagahiro; Satoru Hirenzaki, © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence. We study theoretically the formation of the deeply bound pionic atoms in various cases to deduce the pion properties in nuclei precisely from the observables. We show the angular dependence of the pionic atom formation spectra of the 122Sn(d,3He) reactions in the forward angles. At each scattering angle, a different combination of the pion-bound and neutron-hole states dominates the spectrum because of the kinematical condition. We conclude that we can obtain information on the deeply bound pionic 2p state in addition to the 1s and 2s states by observing the spectra in finite angles. We also consider the neutron-odd nucleus as a target nucleus of the formation reaction, because it has an advantage that the pionic atom is formed in the even-even nucleus, of which the ground state has no neutron-hole states. In the 117Sn(d;3He) reaction, we find that we can see clearly the peak structure of the pionic 1s state formation with the ground state of the even-even nucleus 116Sn. The pionic atom in the even-even nucleus will not have additional shifts induced by the effects of the residual interaction between pion-bound and neutron-hole states. The observation of these pionic states is preferable for extracting the accurate information on the pion properties from data., 2013, 127, 5, 1568, 1570
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 27aHC-15 Overview of experimental search for η' mesic nuclei at FAIR, Itahashi Kenta; Nagahiro Hideko; Nanova Mariana; Nishi Takahiro; Okochi Kota; Outa Haruhiko; Suzuki Ken; Suzuki Takatoshi; Tanaka Yoshiki K.; Weick Helmut; Friedrich Stefan; Fujioka Hiroyuki; Geissel Hans; Hayano Ryugo S.; Hirenzaki Satoru; Itoh Satoshi; Jido Daisuke; Metag Volker, 2013, 68, 0, 87, 87
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 27pHC-5 Semi-exclusive spectra of K^-pp system produced by ^3He(K^-,n) reaction, Yamagata-Sekihara J.; Sekihara T.; Jido D.; Hirenzaki S., 2013, 68, 0, 94, 94
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 22pSH-1 Formation spectra of deeply bound pionic atoms in Green's Function Method, Ikeno N.; Yamagata-Sekihara J.; Nagahiro H.; Hirenzaki S., 2013, 68, 0, 44, 44
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, η'(958)-N effective interaction and η'-mesic nuclei, Hinata A.; Nagahiro H.; Hirenzaki S., 2013, 68, 0, 44, 44
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, In-medium hadron property and chiral symmetry, Hirenzaki S., 2013, 68, 0, 65, 65
  • 日本物理学会講演概要集, FAIRにおけるη′中間子束縛状態探索実験の概要, 板橋健太; FRIEDRICH S.; 藤岡宏之; GEISSEL H.; 早野龍五; 比連崎悟; 伊藤聖; 慈道大介; METAG V.; 永廣秀子; NANOVA M.; 西隆博; 大河内公太; 應田治彦; 鈴木謙; 鈴木隆敏; 田中良樹; WEICK H., 2013, 68, 1
  • 日本物理学会講演概要集, ハドロン質量変化とカイラル対称性, 比連崎悟, 2013, 68, 2
  • Refereed, Hyperfine Interactions, SPRINGER, Measurement of Pionic 121Sn atoms at the RI beam factory, Kenta Itahashi; Georg P.A. Berg; Hiroyuki Fujioka; Hans Geissel; Ryugo S. Hayano; Satoru Hirenzaki; Natsumi Ikeno; Naohito Inabe; Satoshi Itoh; Daisuke Kameda; Toshiyuki Kubo; Hiroaki Matsubara; Shinichiro Michimasa; Kenjiro Miki; Hiroyuki Miya; Masaki Nakamura; Takahiro Nishi; Shumpei Noji; Shinsuke Ota; Ken Suzuki; Hiroyuki Takeda; Koichi Todoroki; Kyo Tsukada; Tomohiro Uesaka; Helmut Weick; Koichi Yoshida, We have measured the energy spectrum of pionic 121Sn atoms by missing-mass spectroscopy of the 122Sn(d, 3He) reaction near the π - emission threshold. The measurement serves as a pilot experiment for high precision systematic spectroscopy of deeply bound pionic atoms in a new pionic Atom Factory project (piAF) at the RI beam factory (RIBF) of RIKEN. The status of the analysis is reported. © 2012 Springer Science+Business Media B.V., May 2012, 209, 1-3, 51, 56
  • Meeting abstracts of the Physical Society of Japan, The Physical Society of Japan (JPS), 27aXC-7 η' nucleus optical potential and formation of η'-nucleus bound state, Nagahiro H.; Hirenzaki S.; Oset E.; Ramos A., 05 Mar. 2012, 67, 1, 112, 112
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 25aGC-13 Development of an Aerogel Cherenkov Detector for Particle Identification in Spectroscopy Experiment of η' Mesic Nuclei, Tanaka Y.; Geissel H.; Weick H.; Metag V.; Nanova M.; Nagahiro H.; Hirenzaki S.; Jido D.; Suzuki K.; Widmann E.; Tabata M.; Itoh S.; Okochi K.; Suzuki T.; Nishi T.; Hayano R. S.; Itabashi K.; Outa H.; Fujioka H., 2012, 67, 0, 87, 87
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 27aXC-2 Pionic atom spectroscopy in the (d,^3He) reaction at finite angles, Ikeno N.; Nagahiro H.; Hirenzaki S., 2012, 67, 0, 111, 111
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 27aXC-6 η'(958) mesic nucleus and η' mass shift by partial restoration of Chiral symmetry, Hirenzaki S.; Nagahiro H.; Jido D., 2012, 67, 0, 112, 112
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 27aXC-8 Spectroscopy of η' mesic nuclei at GSI, Fujioka H.; Suzuki T.; Tanaka Y.; Nishi T.; Hayano R. S.; Nagahiro H.; Hirenzaki S.; Jido D.; Suzuki K.; Widmann E.; Itahashi K.; Outa H.; Geissel H.; Weick H.; Metag V.; Nanova M.; Itoh S.; Okochi K., 2012, 67, 0, 112, 112
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 12pSA-8 Formation of mesic atoms on odd nuclear target, Ikeno N.; Yamagata-Sekihara J.; Nagahiro H.; Hirenzaki S., 2012, 67, 0, 39, 39
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 12pSA-9 Effective nuclear density probed by meson-nucleus systems, Yamagata-Sekihara J.; Ikeno N.; Nagahiro H.; Jido D.; Hirenzaki S., 2012, 67, 0, 39, 39
  • Refereed, EPJ Web of Conferences, E D P SCIENCES, Formation of η′(958) mesic nuclei, Satoru Hirenzaki; Daisuke Jido; Hideko Nagahiro, In this report, we show the theoretical results of the formation spectra of the η′-nucleus systems in the (p,d) reactions based on the latest theoretical considerations of the η′ properties in nucleus. The results shown here are important to give predictions and supports to the future experiment, and to make clear relations between the η′ mesic nucleus formation spectra and the modifications of the η′ properties at finite density, which will give us new information on the η′ mass generation mechanism., 2012, 37, 02001
  • Refereed, EPJ Web of Conferences, E D P SCIENCES, Formation of deeply bound pionic atoms in Sn isotopes, Natsumi Ikeno; Hideko Nagahiro; Daisuke Jido; Satoru Hirenzaki, We study the formation of deeply bound pionic atoms in the (d, 3He) reactions theoretically and show the energy spectra of the emitted 3He at finite angles. We find that the different combinations of the pion-bound and neutron-hole states dominate the formation spectra at different scattering angles because of the matching condition of the reaction. We conclude that the observation of the (d,3He) reaction at finite angles will provide the systematic information of the pionic bound states in each nucleus, and it will help to develop the study of the pion properties and the partial restoration of chiral symmetry in nuclei., 2012, 37, 09018
  • Refereed, EPJ Web of Conferences, E D P SCIENCES, η′ meson under partial restoration of chiral symmetry in nuclear medium, Daisuke Jido; Hideko Nagahiro; Satoru Hirenzaki; Shuntaro Sakai, We shed light upon the η′ mass in nuclear matter in the context of partial restoration of chiral symmetry, pointing out that the U A(1) anomaly effects causes the η′-η mass difference necessarily through the chiral symmetry breaking. As a consequence, it is expected that the η′ mass is reduced by order of 100 MeV in nuclear matter where partial restoration of chiral symmetry takes place. The discussion given here is based on Ref. [1]., 2012, 37, 09019
  • Refereed, EPJ Web of Conferences, E D P SCIENCES, First pionic atom spectroscopy at RIBF, Kenta Itahashi; Georg P.A. Berg; Hiroyuki Fujioka; Hans Geissel; Ryugo S. Hayano; Satoru Hirenzaki; Natsumi Ikeno; Naohito Inabe; Satoshi Itoh; Daisuke Kameda; Toshiyuki Kubo; Hiroaki Matsubara; Shinichiro Michimasa; Kenjiro Miki; Hiroyuki Miya; Masaki Nakamura; Takahiro Nishi; Shumpei Noji; Shinsuke Ota; Ken Suzuki; Hiroyuki Takeda; Koichi Todoroki; Kyo Tsukada; Tomohiro Uesaka; Helmut Weick; Koichi Yoshida, We have performed an inclusive spectroscopy of 122Sn(d, 3He) reaction near the pion emission threshold at an incident energy of Td = 250 MeV/nucleon. The first experiment aims as devloping the high precision spectroscopy of pionic atoms at the RI beam factory (RIBF) of RIKEN, which leads to a new project, pionic Atom Factory project (piAF) to measure pionic atoms for a wide range of elements. We report the analysis status of the pilot experiment., 2012, 37, 01013
  • Refereed, EPJ Web of Conferences, E D P SCIENCES, Spectroscopy of η′ -nucleus bound states at GSI-SIS, Hiroyuki Fujioka; Kenta Itahashi; Hans Geissel; Ryugo S. Hayano; Satoru Hirenzaki; Satoshi Itoh; Daisuke Jido; Volker Metag; Hideko Nagahiro; Mariana Nanova; Takahiro Nishi; Kota Okochi; Haruhiko Outa; Ken Suzuki; Takatoshi Suzuki; Yoshiki K. Tanaka; Helmut Weick, The η′ meson mass may be reduced due to partial restoration of chiral symmetry. If this is the case, an η′-nucleus system may form a nuclear bound state. We plan to carry out a missing-mass spectroscopy experiment with the 12C(p,d) reaction at GSI-SIS. Peak structures corresponding to such a bound state may be observed even in an inclusive measurement, if the decay width is narrow enough., 2012, 37
  • 日本物理学会講演概要集, 奇核標的における中間子原子生成, 池野なつ美; 山縣(関原)淳子; 永廣秀子; 比連崎悟, 2012, 67, 2
  • Refereed, Few-Body Systems, SPRINGER WIEN, Latest Results for the Antikaon-Nucleon Optical Potential, V. K. Magas; J. Yamagata-Sekihara; S. Hirenzaki; E. Oset; A. Ramos, The key question of this letter is whether the K--nucleus optical potential is deep, as it is prefered by the phenomenological fits to kaonic atoms data, or shallow, as it comes out from unitary chiral model calculations. The current experimental situation is reviewed. © 2010 Springer-Verlag., May 2011, 50, 1-4, 343, 345
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 26aGM-11 Meson production in light nuclei, Hirenzaki S., 2011, 66, 0, 86, 86
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 16pSG-8 Partial restoration of chiral symmetry in nuclear matter and eta' mesonic nuclei, Jido D.; Nagahiro H.; Hirenzaki S., 2011, 66, 0, 69, 69
  • Refereed, Journal of Physics: Conference Series, IOP PUBLISHING LTD, Selected topics on hadrons in nuclei, E. Oset; M. Kaskulov; E. Hernandez; A. Ramos; K. Magas; J. Yamagata-Sekihara; S. Hirenzaki; D. Gamermann; R. Molina; L. Tolos; L. Roca, In this talk we report on selected topics on hadrons in nuclei. The first topic is the renormalization of the width of the Λ(1520) in a nuclear medium. This is followed by a short update of the situation of the ω in the medium. The investigation of the properties of K in the nuclear medium from the study of the (Kflight,p) reaction is also addressed, as well as properties of X,Y,Z charmed and hidden charm resonances in a nuclear medium. Finally we address the novel issue of multimeson states., 2011, 312, SECTION 2
  • Refereed, AIP Conference Proceedings, AMER INST PHYSICS, Structure and formation of η- and π-nucleus systems, Satoru Hirenzaki; Natsumi Ikeno; Daisuke Jido; Hideko Nagahiro, In this article, we review recent research activities on the structure and formation of the η mesic nuclei and the pionic atoms. © 2011 American Institute of Physics., 2011, 1388, 1, 495, 501
  • Refereed, ACTA PHYSICA POLONICA B, POLISH ACAD SCIENCES INST PHYSICS, FORMATION OF eta-MESIC NUCLEI, Satoru Hirenzaki; Hideko Nagahiro; Daisuke Jido, In this paper, we briefly introduce the interests and the recent research activities on the eta-mesic nuclei. We also mention the activities on the eta'(958)-mesic nucleus formation., Oct. 2010, 41, 10, 2211, 2220
  • Refereed, NUCLEAR PHYSICS A, ELSEVIER SCIENCE BV, Formation of Slow Heavy Mesons in Nuclei, Satoru Hirenzaki; Junko Yamagata-Sekihara, We study phi meson production in the (12)C((p) over bar, phi) reaction at p((p) over bar) = 1.3 GeV/c. We also discuss the interest in and the difficulties of studying heavy meson-nucleus systems., Apr. 2010, 835, 1-4, 406, 409
  • Refereed, Nuclear Physics A, ELSEVIER SCIENCE BV, The (K-, p) reaction on nuclei with in-flight kaons, A. Ramos; V. K. Magas; J. Yamagata-Sekihara; S. Hirenzaki; E. Oset, We perform a theoretical study of the spectrum of protons with kinetic energies of around 600 MeV, emitted following the interaction of 1 GeV/c kaons with nuclei. A recent experimental analysis of this (K-, p) reaction on 12C, based on the dominant quasielastic process, has suggested a deeply attractive kaon nucleus potential. Our Monte Carlo simulation considers, in addition, the one-and two-nucleon K- absorption processes producing hyperons that decay into πN pairs. We find that this kaon in-flight reaction is not well suited to determine the kaon optical potential due, essentially, to the limited sensitivity of the cross section to its strength, and also to unavoidable uncertainties from the coincidence requirement applied in the experiment. A shallow kaon nucleus optical potential obtained in chiral models is perfectly compatible with the observed spectrum. © 2010 Elsevier B.V. All rights reserved., Apr. 2010, 835, 1-4, 382, 385
  • Refereed, Hadron and Nuclear Physics 09: Osaka University, Japan, 16-19 November 2009, World Scientific Publishing Co., Meson properties in nuclear medium, S. Hirenzaki; N. Ikeno; H. Nagahiro; J. Yamagata-Sekihara, © 2010 by World Scientific Publishing Co. Pte. Ltd. All rights reserved. We discuss the interests and difficulties of the studies of the meson-nucleus bound systems. As recent topics, we briefly explain the research activities of the deeply bound pionic atoms, the η'(958) mesic nuclei, and the ϕ mesic nuclei., 01 Jan. 2010, 134, 140
  • Refereed, Hadron and Nuclear Physics 09: Osaka University, Japan, 16-19 November 2009, World Scientific Publishing Co., Deeply bound pionic states in Sn at RIKEN RI beam factory, N. Ikeno; H. Nagahiro; S. Hirenzaki; J. Yamagata-Sekihara; D. Jido, © 2010 by World Scientific Publishing Co. Pte. Ltd. All rights reserved. We study the structure of pionic atoms in l21Sn, for which a new experiment will be performed at RIKEN RI Beam Factory. We evaluate numerically the effective nuclear densities probed by pion and potential parameter dependence of the binding energies and widths., 01 Jan. 2010, 206, 210
  • Refereed, Hadron and Nuclear Physics 09: Osaka University, Japan, 16-19 November 2009, World Scientific Publishing Co., Formation of η-mesic nuclei by (π, N) reaction at J-PARC, H. Nagahiro; S. Hirenzaki; D. Jido, © 2010 by World Scientific Publishing Co. Pte. Ltd. All rights reserved. We study the formations of of the η-nucleus systems in the (πN) reactions with nuclear targets, which can be performed at existing and/or forthcoming facilities, including the Japan Proton Accelerator Research Complex, to investigate the η-nucleus interaction. Based on the N*(1535) dominance in the ηN system, the η-mesic nuclei are suitable systems for the study of in-medium properties of the N*(1535) baryon resonance, such as reduction of the mass difference of N and N* in the nuclear medium, which affects the level structure of the η and N*-hole modes. We find that clear information on the in-medium N*- and η-nucleus interactions can be obtained through the formation spectra of the η-mesic nuclei., 01 Jan. 2010, 141, 149
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 23aBC-8 Pion Properties in Nuclei from Deeply Bound Atomic States, Ikeno N.; Yamagata-Sekihara J.; Nagahiro H.; Jido D.; Hirenzaki S., 2010, 65, 0, 95, 95
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 13aSE-11 Formation of D Mesic Nuclei, Ikeno N.; Nagahiro H.; Hirenzaki S., 2010, 65, 0, 44, 44
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 11pSF-11 Formation of η-^4He bound states by deuteron + deuteron reaction, Hirenzaki S.; Nagahiro H.; Jido D., 2010, 65, 0, 60, 60
  • Progress of Theoretical Physics, Formation of meson nucleus systems - Recent activities on K-and φ Mesic Nuclei, Satoru Hirenzaki; Junko Yamagata-Sekihara, In this paper, we briefly introduce the interests and the recent research activities on K- and φ mesic nuclei., 2010, SUPPL. 186, 312, 315
  • Refereed, AIP Conference Proceedings, AMER INST PHYSICS, Experimental status of deeply bound kaonic states in nuclei, V. K. Magas; J. Yamagata-Sekihara; S. Hirenzaki; E. Oset; A. Ramos, We review recent claims of the existence of deeply bound kaonic states in nuclei. Also we study in details the (K-, p) reaction on 12C with 1 GeV/c momentum kaon beam, based on which a deep kaon nucleus optical potential was claimed in [1]. In our Monte Carlo simulation of this reaction we include not only the quasi-elastic K-p scattering, as in [1], but also K- absorption by one and two nucleons followed by the decay of the hyperon in πN, which can also produce strength in the region of interest. The final state interactions in terms of multiple scattering of the K-, p and all other primary particles on their way out of the nucleus is also considered. We will show that all these additional mechanisms allow us to explain the observed spectrum with a "standard" shallow kaon nucleus optical potential obtained in chiral models. © 2010 American Institute of Physics., 2010, 1322, 334, 338
  • Refereed, PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT, PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE, Formation of Meson Nucleus Systems - Recent Activities on K- and phi Mesic Nuclei, Satoru Hirenzaki; Junko Yamagata-Sekihara, In this paper, we briefly introduce the interests and the recent research activities on K- and phi mesic nuclei., 2010, 186, 312, 315
  • Refereed, AIP Conference Proceedings, AMER INST PHYSICS, Kaon absorption in flight and the binding of K̄ in nuclei, E. Oset; V. K. Magas; A. Ramos; J. Yamagata-Sekihara; S. Hirenzaki, We make a theoretical study of the kaon absorption in flight on nuclei with a kaon beam of 1 GeV momentum, paying special attention to the forward and energetic emitted protons, which were used to claim a deep kaon nucleus optical potential in a recent experiment. We perform a Monte Carlo simulation of this reaction, which allows to account not only for quasi-elastic K-p scattering, but also for the other processes which contribute to the proton spectra and which are not taken into account by the ordinary Green's function method analysis. The experiment looks for fast protons, but in coincidence with at least one charged particle in a decay counters sandwiching the target. The coincidence requirement is assumed not to distort the shape of the proton spectra, but we show that this is not the case and as a consequence the conclusions drawn from the experimental analysis do not hold. © 2010 American Institute of Physics., 2010, 1257, 750, 754
  • Refereed, AIP Conference Proceedings, Formation of ν mesic nuclei at JPARC and COSY, Satoru Hirenzaki; Hideko Nagahiro; Daisuke Jido, In this article, we consider theoretically the formation reactions of the ν mesic nuclei at JPARC and COSY. © 2010 American Institute of Physics., 2010, 1322, 1, 28, 35
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 27pXF-6 Exclusive spectra of in-flight (K^-, N) reaction for light kaonic nucleus formation, 関原(山縣) 淳子; 関原 隆泰; 永廣 秀子; 慈道 大介; 比連崎 悟, 2009, 64, 0, 40, 40
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 27pXF-11 Structure and formation of φ mesic nuclei, Sekihara-Yamagata J.; Hirenzaki S.; Cabrera D.; Vicente-Vacas M. J., 2009, 64, 0, 41, 41
  • 日本物理学会講演概要集, 一般社団法人 日本物理学会, 27pXF-12 (γ,d)反応による中間子原子核生成(ハイパー核・ストレンジネス(合同)II,27pXF 理論核物理領域,実験核物理領域合同,理論核物理領域), 池野 なつ美; 関原(山縣) 淳子; 永廣 秀子; 慈道 大介; 比連崎 悟, 2009, 64, 0, 42, 42
  • Nonlinear Phenomena in Complex Systems, The (K-, p) reaction on 12C at KEK, V. K. Magas; J. Yamagata-Sekihara; S. Hirenzaki; E. Oset; A. Ramos, We study the (K-, p) reaction on 12C with a kaon beam of 1 GeV momentum, paying a special attention to the region of emitted protons having kinetic energy above 600 MeV, which was used to claim a deep kaon nucleus optical potential [1]. The experiment looks for fast protons emitted from the absorption of in flight kaons by nuclei, but in coincidence with at least one charged particle in the decay counters sandwiching the target. The analysis of the data is done in [1] assuming that the coincidence requirement does not change the shape of the final spectra. However our detailed calculations show that this assumption does not hold, and, thus, the final conclusion of this experiment is doubtful. We perform Monte Carlo simulation of this reaction. The advantage of our method with respect to Green's function method used in [1] is that it allows to account not only for quasi-elastic K-p scattering, but also for the other processes which contribute to the proton spectra. We investigated the effect of the multi-scatterings and of the K- absorptions by one and two nucleons (K-N → πY and K -NN → YN) followed by the decay of the hyperon in πN. We show that all these mechanisms allow us to explain reasonably well the observed spectrum with "standard" shallow kaon nucleus optical potential, obtained in chiral models., 2009, 12, 4, 414, 418
  • Refereed, Hyperfine Interactions, SPRINGER, Recent topics of mesic atoms and mesic nuclei, Junko Yamagata-Sekihara; Satoru Hirenzaki; Daniel Cabrera; Manuel J.Vicente Vacas, We study φ-meson production in nuclei to investigate the in-medium modification of the φ-meson spectral function at finite density. We consider (p̄, φ), (γ,p) and (π-, n) reactions to produce a φ-meson inside the nucleus and evaluate the effects of the medium modifications to reaction cross sections. The structures of the bound states, φ-mesic nuclei, are also studied. For strong absorptive interaction cases, we need to know the spectrum shape in a wide energy region to deduce the properties of φ. © Springer Science+Business Media B.V. 2009., 2009, 193, 1-3, 75, 80
  • Refereed, Hyperfine Interactions, SPRINGER, Pionic atom factory project in the RIBF: Spectroscopy of pionic atom in 122Sn(d,3He) nuclear reaction, Kenta Itahashi; Satoshi Itoh; Nobuhisa Fukunishi; Hans Geissel; Ryugo S. Hayano; Satoru Hirenzaki; Masahiko Iwasaki; Paul Kienle; Rie Kimura; Karl Lindberg; Chiara Nociforo; Hiroaki Ohnishi; Shinji Okada; Naoya Ono; Haruhiko Outa; Masaharu Sato; Ken Suzuki; Takatoshi Suzuki; Hideyuki Tatsuno; Per Erik Tegnér; Masanori Wakasugi; Helmut Weick; Junko Yamagata-Sekihara; Toshimitsu Yamazaki; Yasushige Yano; Irina Zartova, We are preparing for a high resolution spectroscopy of the 1s and 2s pionic states of 121Sn in the 122Sn(d,3He) reaction at the incident deuteron energy of ~500 MeV. The measurement will provide accurate information on the strong interaction between the pion and the nucleus, which leads to quantitative determination of the magnitude of the quark condensate at the normal nuclear density. © Springer Science+Business Media B.V. 2009., 2009, 193, 1-3, 27, 31
  • 原子核研究, エキゾチック原子核の生成反応入門, 原田融; 比連崎悟; 山縣(関原)淳子, 2009, 53, Supplement 2
  • Refereed, Modern Physics Letters A, WORLD SCIENTIFIC PUBL CO PTE LTD, Nuclear effects in neutrino induced reactions, M. J. Vicente Vacas; L. Alvarez-Ruso; L. S. Geng; J. Nieves; M. Valverde; S. Hirenzaki, We discuss the relevance of nuclear medium effects in the analysis of some low and medium energy neutrino reactions of current interest. In particular, we study the Quasi-Elastic (QE) process, where RPA correlations and Final State Interactions (FSI) are shown to play a crucial role. We have also investigated the ν induced coherent pion production. We find a strong reduction of the cross section due to the distortion of the pion wave function and the modification of the production mechanisms in the nucleus. The sensitivity of the results to the axial NΔ coupling C5A(0) has been also investigated. © 2008 World Scientific Publishing Company., 30 Sep. 2008, 23, 27-30, 2321, 2324
  • Refereed, MODERN PHYSICS LETTERS A, WORLD SCIENTIFIC PUBL CO PTE LTD, MESIC ATOMS AND MESIC NUCLEI, Satoru Hirenzaki, We briefly summarize the interests in mesic atoms and mesic nuclei in the contemporary hadron-nucleus physics and give a short report on the recent research activities for several meson-nucleus systems., Sep. 2008, 23, 27-30, 2497, 2504
  • Refereed, MODERN PHYSICS LETTERS A, WORLD SCIENTIFIC PUBL CO PTE LTD, STRUCTURE AND FORMATION OF KAONIC ATOMS AND KAONIC NUCLEI, Junko Yamagata; Satoru Hirenzaki; Hideko Nagahiro; Daisuke Jido, We study theoretically the in-flight (K-, N) reactions for the formation of (K) over bar NN systems using the microscopic chiral unitary s-wave (K) over barN amplitude to get deeper physical insights on the expected spectra, and to investigate the experimental feasibility of the reaction at J-PARC facility. We show the missing mass spectra of the (K-, N) reactions accompanied by the particle emissions due to (K) over barK absorption in nucleus., Sep. 2008, 23, 27-30, 2528, 2531
  • Refereed, MODERN PHYSICS LETTERS A, WORLD SCIENTIFIC PUBL CO PTE LTD, STUDY OF IN-MEDIUM PROPERTIES OF N*(1535) AND CHIRAL SYMMETRY FOR BARYONS THROUGH THE eta-MESIC NUCLEI FORMATION AT J-PARC, Hideko Nagahiro; Daisuke Jido; Satoru Hirenzaki, We investigate the properties of eta-nucleus interaction by postulating the N*(1535) dominance for eta-N system. We evaluate the N*(1535) properties in the nuclear medium using two kinds of chiral models, and find that these two models provide qualitatively different eta-nucleus optical potentials reflecting the quite distinct properties of N*(1535) in these chiral models. Especially, in the chiral doublet model, we can expect to have the level crossing between eta and N*(1535)-hole which is expected to provide the characteristic features for the optical potential and the formation spectra. We find also that the difference of these models can be seen in the formation cross sections of the eta mesic nuclei with (pi(+),p) reaction expected to be performed at J-PARC project., Sep. 2008, 23, 27-30, 2512, 2515
  • Refereed, Progress in Particle and Nuclear Physics, Elsevier BV, Photo- and electro-production of mesons on nucleons and nuclei, E. Oset; M. Döring; D. Strottman; D. Jido; M. Napsuciale; K. Sasaki; C.A. Vaquera-Araujo; M. Kaskulov; E. Hernandez; H. Nagahiro; S. Hirenzaki, Jul. 2008, 61, 1, 260, 275, True
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 23aSD-6 Precision Spectroscopy of Pionic Atom in (d,^3He) Nuclear Reaction (3) : Beam Optics Calculation of Deuteron Beam, Itoh S.; Sato M.; Wakasugi M.; Yamazaki T.; Yano Y.; Geissel H.; Nociforo C.; Weick H.; Kimura R.; Hirenzaki S.; Yamagata J.; Ono N.; Kienle P.; Suzuki K.; Lindberg K.; Tegner P.-E.; Zartova I.; Okada S.; Suzuki T.; Tatsuno H.; Hayano R.S.; Itahashi K.; Iwasaki M.; Ohnishi H.; Outa H., 2008, 63, 0, 74, 74
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 24aZG-10 Formation of Mesic Atoms and Mesic Nuclei, Hirenzaki Satoru, 2008, 63, 0, 46, 46
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 24aZG-6 3 body Structure of K^^-NN system, Noda H.; Yamagata J.; Sasaki K.; Hiyama E.; Hirenzaki S., 2008, 63, 0, 45, 45
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 23pZG-15 Precision Spectroscopy of Pionic Atom in (d,^3He) Nuclear Reaction (2) : Beam Optics Calculation of Deuteron Beam, Itoh S.; Sato M.; Suzuki T.; Wakasugi M.; Yamazaki T.; Yano Y.; Geissel H.; Nociforo C.; Weick H.; Kimura R.; Hirenzaki S.; Ono N.; Yamagata J.; Kienle P.; Suzuki K.; Lindberg K.; Tegner P.-E.; Zartova I.; Tatsuno H.; Hayano R.S.; Itahashi K.; Iwasaki M.; Ohnishi H.; Okada S.; Outa H., 2008, 63, 0, 39, 39
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 23pZG-14 Theoretical Study of Deeply Bound Picnic Atom Formation, Kimura Rie; Yamagata Junko; Geng Li Sheng; Hirenzaki Satoru, 2008, 63, 0, 39, 39
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 24pZH-8 Strucutre and formation of φ mesic nuclei, Yamagata Junko; Hirenzaki Satoru; Cabrera D.; Vicente-Vacas M.J., 2008, 63, 0, 54, 54
  • 2nd International EtaMesonNet Workshop, ETA 2007, η- and η′(958)-mesic nuclei formation and U A(1) anomaly at finite density in Nambu-Jona-Lasinio model, H. Nagahiro; M. Takizawa; S. Hirenzaki, 2007, 73, 74
  • 2nd International EtaMesonNet Workshop, ETA 2007, Theoretical aspects of η mesic nuclei and formation reactions, Satoru Hirenzaki, 2007, 64, 65
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 28aSC-9 In-flight(K^-,N) spectra on light nuclei for kaon bound states formation, Yamagata Junko; Hirenzaki Satoru, 2007, 62, 0, 51, 51
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 22aYE-5 Restoration of U_A(1) symmetry at finite density, Takizawa Makoto; Nagahiro Hideko; Hirenzaki Satoru, 2007, 62, 0, 43, 43
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 24aZD-11 Precision Spectroscopy of Pionic Atoms in (d,^3He) Nuclear Reactions (1) : Beam Optics Calculation of deuteron Beam, Itoh S.; Suzuki T.; Wakasugi M.; Yamazaki T.; Yano Y.; Geissei H.; Weick H.; Kimura R.; Hirenzaki S.; Yamagata J.; Kienle P.; Tatsuno H.; Suzuki K.; Lindberg K.; Tegner P.-E.; Zartova I.; Hayano R.S.; Itahashi K.; Iwasaki M.; Ohnishi H.; Okada S.; Outa H.; Sato M., 2007, 62, 0, 91, 91
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 21pZD-8 Structure of K^^-NN Bound system with Gaussian Expansion Method, Noda H.; Yamagata J.; Sasaki K.; Hiyama E.; Hirenzaki S., 2007, 62, 0, 71, 71
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 22aYE-3 Photoproduction of φ meson and φ mesic nuclei, Yamagata Junko; Hirenzaki Satoru, 2007, 62, 0, 42, 42
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 22aYE-2 Possible ω bound states in nuclei produced with the (γ,p) reaction, Nagahiro H.; Kaskulov M.; Oset E.; Jido D.; Hirenzaki S., 2007, 62, 0, 42, 42
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 22aYE-1 Deeply Bound Pionic Atom Formation by (d,^3He) reactions at RIBF, Kimura Rie; Yamagata Junko; Hirenzaki Satoru, 2007, 62, 0, 42, 42
  • Refereed, PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT, PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE, Chiral physics in mesic atoms and mesic nuclei, Satoru Hirenzaki, We summarize recent research activities on the mesic atoms and mesic nuclei in the context of the chiral dynamics in medium. We briefly introduce the studies of Kaon-, eta-, eta'(958)-bound states in nuclei., 2007, 168, 458, 465
  • Refereed, AIP Conference Proceedings, AMER INST PHYSICS, Neutrino-induced coherent pion production, L. Alvarez-Ruso; L. S. Geng; S. Hirenzaki; M. J.Vicente Vacas; T. Leitner; U. Mosel, We have investigated the neutrino induced coherent pion production reaction at the energies of interest for recent experiments like K2K and MiniBooNE. The model includes pion, nucleon and the δ( 1232) resonance. Medium effects in the production mechanism and the distortion of the pion wave function are taken into account. We find a strong reduction of the cross section due to these effects and also substantial modifications in the energy distributions of the final pion. The sensitivity of the results on the axial N-δ coupling CA5 (0) and the coherent fraction in neutral-current π0 production are discussed. © 2007 American Institute of Physics., 2007, 967, 201, 204
  • Refereed, CONDENSED MATTER THEORIES, VOL 21, NOVA SCIENCE PUBLISHERS, INC, Exotic mesic atoms for a class of strongly correlated fermi systems, S. Hirenzaki; H. Nagahiro; J. Yamagata, 2007, 21, 351, +
  • 素粒子論研究, 素粒子論グループ 素粒子論研究 編集部, 中間子原子と中間子原子核(基研滞在型研究会「テンソル力と多核子相関」研究会報告), 比連崎 悟, 2006, 113, 6, F101, F102
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 29pWG-6 η'(958) mesic nuclei with NJL model and the effect of U_A(1) anomaly at finite density, Nagahiro Hideko; Takizawa Makoto; Hirenzaki Satoru, 2006, 61, 0, 43, 43
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 27aWG-7 Light scalar meson nonet at finite density, Takizawa Makoto; Nagahiro Hideko; Hirenzaki Satoru; Oka Makoto, 2006, 61, 0, 31, 31
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 29pWD-3 Kaon bound states in In-flight (K^^-, N) spectra, Yamagata Junko; Nagahiro Hideko; Hirenzaki Satoru, 2006, 61, 0, 71, 71
  • 日本物理学会講演概要集, 一般社団法人 日本物理学会, 30aWB-1 Mesic Atoms and Mesic Nuclei : どうやって作るか何が面白いか(30aWB 理論核物理領域,実験核物理領域合同シンポジウム:クォーク・ハドロン多体系の物理:J-PARCを目指して,理論核物理領域,実験核物理領域合同招待講演,理論核物理領域), 比連崎 悟, 2006, 61, 0, 44, 44
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 21pSD-9 (K^-,N) reactions at J-PARC and Kaon-Nucleus systems, Yamagata Junko; Nagahiro Hideko; Hirenzaki Satoru, 2006, 61, 0, 40, 40
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 22aSC-6 Strange mesons at finite density, Takizawa Makoto; Nagahiro Hideko; Hirenzaki Satoru; Oka Makoto, 2006, 61, 0, 18, 18
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 20pSC-8 Formation reaction of eta mesic nuclei induced by meson beam, Nagahiro Hideko; Jido Daisuke; Hirenzaki Satoru, 2006, 61, 0, 7, 7
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 20pSC-7 Possible level crossing of eta and N^*-hole modes in nuclei, Jido D.; Nagahiro H.; Hirenzaki S.; Kolomeitsev Evigeni E., 2006, 61, 0, 7, 7
  • Refereed, AIP Conference Proceedings, AMER INST PHYSICS, η′(958)-mesic nuclei formation and UA(1) anomaly at finite density, Hideko Nagahiro; Makoto Takizawa; Satoru Hirenzaki, We discuss the possibility of producing the bound states of the η′(958) meson in nuclei theoretically using the the Nambu-Jona-Lasinio (NJL) model. We calculate the formation cross section of the η′ bound states with the Green function method for the (γ,p) reaction and discuss the experimental feasibility at photon facilities such as SPring-8. We conclude that we can expect to observe resonance peaks in (γ,p) spectra for the formation of η′ bound states and we can deduce new information on η′ properties at finite density. These observations are believed to be essential to know the possible mass shift of η′ and deduce new information on the effective restoration of the chiral UA(1) anomaly at finite density. © 2006 American Institute of Physics., 2006, 842, 228, 230
  • Not Refereed, Nuclear Physics A, ELSEVIER SCIENCE BV, In-medium properties of N*(1535) in chiral models and η-nucleus interaction, H. Nagahiro; D. Jido; S. Hirenzaki, We investigate the properties of η-nucleus interaction by postulating the N*(1535) dominance for η-N system. We evaluate the N*(1535) properties in the nuclear medium using two kinds of chiral models, and find that these two models provide qualitatively different η-nucleus optical potential reflecting the quite distinct properties of N*(1535) in these chiral models. We find also that the difference of these models can be seen in the formation cross sections of the η mesic nuclei with (d, 3He) and (γ,p) reactions, which are expected to be distinguishable in experiments. © 2005 Elsevier B.V. All rights reserved., 13 Jun. 2005, 755, 1-4, 491, 494
  • Not Refereed, JPS journal, Origin of Hadron Masses probed by Pionic Atoms, HIRENZAKI Satoru; K. Suzuki, 2005, 60, 12, 19
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 24pWH-13 In-medium effect of U_A(1) anomaly and formation of η'(958) mesic nuclei, Nagahiro Hideko; Hirenzaki Satoru, 2005, 60, 0, 39, 39
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 27aZA-10 "Production of θ^+ Hypernuclei with the (K^+,π^+) reaction", Hirensaki S.; Nagahiro H.; set E.; Vicente M. J.; Vacas A, 2005, 60, 0, 53, 53
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 27pZA-8 Formation of K-nucleus bound systems by In-flight (K,N) reactions, Yamagata Junko; Nagahiro Hideko; Hirenzaki Satoru, 2005, 60, 0, 56, 56
  • Not Refereed, Pentaquark 04, Proceedings, WORLD SCIENTIFIC PUBL CO PTE LTD, Production of circle dot(+) hypernuclei with the (K+,pi(+)) reaction, H Nagahiro; S Hirenzaki; E Oset; MJV Vacas, We investigate the formation cross sections of the Theta(+)-hypernuclei theoretically. In the (K+,pi(+)) reaction, we obtain the excitation spectra with clearly differentiated peaks corresponding to the Theta(+) bound states., 2005, 378, 385
  • Not Refereed, Butsuri, The Physical Society of Japan, Pionic Atom as a Probe of Origin of the Hadron Mass-Quantitative Evaluation of the Chiral Condensate in a Nuclear Medium-, Suzuki Ken; Itahashi Kenta; Hirenzaki Satoru; Hayano Ryugo, Spontaneous breaking of chiral symmetry is believed to be the mechanism which endows nucleons their large masses. The order parameter of the symmetry breaking is the' chiral condensate, whose magnitude is predicted to decrease linearly as the nuclear density is increased. ' The reduction of quark condensate was quantitatively studied from recent precise measurement of deeply bound pionic Is states " on three tin (Sn) isotopes. We made use of the Gell-Mann-Oakes-Renner relation which connects the magnitude of quark-codensate to a pion decay constant, and then used the Tomozawa-Wemberg relation which relates the pion decay constant to an isovector strength of the pion-nucleus potential. The potential strength was determined by fitting the measured pionic Is-state binding energies. The result shows that the quark-condensate strength is reduced by about 35% at normal nuclear density, compared with the "vacuum" value obtained from pionic hydrogen X-ray measurements This is the first quantitative deduction of the quark condensate modification at finite nuclear density, and is an important step towards understanding the origin of hadron masses., 2005, 60, 1, 12, 19
  • Not Refereed, 原子核研究, Formation of Kaonic Atoms and Kaonic Nuclei in In-Flight (K,N) reactions, HIRENZAKI Satoru; J. Yamagata, 2005, 50, 3, 41, 45
  • Not Refereed, 原子核研究, Spectroscopy of Pionic Atoms with Unstable Nuclei, HIRENZAKI Satoru; K. Itahahsi, 2005, 49, 6, 153, 158
  • KEK Proceedings, 『中間子原子核』~KEK研究会「通常核から離れた核物理の新展開」~, 比連崎悟, 2005, 2004-15
  • Not Refereed, Nuclear Physics A, ELSEVIER SCIENCE BV, Mesic atoms and mesic nuclei, Satoru Hirenzaki, In this paper we will report recent developments of the theoretical studies for the structure and formation of the meson-nucleus systcms. Following subjects will be included; Formation of the 1s pionic states in medium heavy nuclei and a clear evidence for partial restoration of chiral symmetry in nuclear medium, Deeply bound pionic atom formation in β-unstable nuclei with halo neutron states, Structure and formation of the η mesic nuclei in chiral models. © 2004 Published by Elsevier B.V., 28 Jun. 2004, 738, 1-4 SUPPL., 377, 381
  • Not Refereed, KEK Proceedings, Mesic Nuclei, HIRENZAKI Satoru; S. Hirenzaki, 2004, 2004, 15, 64, 69
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 28pSJ-5 Possibility of the η′(958) formation in the nuclear medium, Nagahiro Hideko; Hirenzaki Satoru, 2004, 59, 0, 34, 34
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 30pSH-3 K-mesic Nuclei Formation in (K, N) reactions, Yamagata Junko; Nagahiro Hideko; Hirenzaki Satoru, 2004, 59, 0, 68, 68
  • Not Refereed, KEK 研究会議事録, 中間子原子核, 比連崎 悟; 比連崎悟, 2004, 2004, 15, 64, 69
  • Not Refereed, Progress of Theoretical Physics Supplement, PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE, η-mesic nuclei in chiral models, Hideko Nagahiro; Daisuke Jido; Satoru Hirenzaki, The properties of η-nucleus interaction and their experimental consequences are investigated with η-nucleus optical potentials obtained by postulating the N*(1535) dominance for η-N system. The N*(1535) properties in the nuclear medium are evaluated by two kinds of chiral effective models based on distinct pictures of N*(1535). We find that these two models provide qualitatively different optical potentials of the η meson, reflecting the different in-medium properties of N*(1535) expected in these two models. In order to compare these models in physical observables, we calculate spectra of (d,3He) reactions for the η mesic nucleus formation with various kinds of target nuclei. We show that the (d, 3He) spectra obtained in these models are significantly different and are expected to be distinguishable in experiments., 2004, 153, 153, 340, 343
  • Refereed, Nuclear Physics A, ELSEVIER SCIENCE BV, Formation of deeply bound pionic atoms in the (d,3He) reaction, S. Hirenzaki, In this short report, we summarize recent research activities on meson-nucleus bound systems using the (d,3He) spectroscopies., 30 Jun. 2003, 721, C839, C841
  • Refereed, Nuclear Physics A, ELSEVIER SCIENCE BV, Medium effects to the N(1535) resonance and η mesic nuclei, D. Jido; H. Nagahiro; S. Hirenzaki, The structure of η-nucleus bound systems (η mesic nuclei) is investigated as one of the tools to study in-medium properties of the N(1535) (N*) resonance. We show that, as a general consequence, the η-nucleus potential has a repulsive core at the nuclear center with an attractive part at the nuclear surface, if sufficient reduction of the mass difference of N and N* stems from the in-medium effects to N*. The (d,3He) spectra are evaluated for the formation of these bound states to investigate the experimental feasibility., 30 Jun. 2003, 721, C665, C668
  • Refereed, Nuclear Physics A, ELSEVIER SCIENCE BV, Deeply bound pionic 1s states in Sn isotopes, K. Suzuki; M. Fujita; H. Geissel; H. Gilg; A. Gillitzer; R. S. Hayano; S. Hirenzaki; K. Itahashi; M. Iwasaki; P. Kienle; M. Matos; G. Münzenberg; T. Ohtsubo; M. Sato; M. Shindo; T. Suzuki; H. Weick; M. Winkler; T. Yamazaki; T. Yoneyama, We successfully observed deeply bound pionic 1s states in Sn isotopes (115Sn, 119Sn, 123Sn) using the Sn(d,3He) pion-transfer reaction under the recoil-free condition. The 1s binding energies and widths were determined to high precision. The present results indicate that the isovector part of the s-wave pion-nucleus interaction is significantly enhanced, giving a clear evidence for partial restoration of chiral symmetry in the nuclear medium., 30 Jun. 2003, 721, C831, C834
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 12aSH-3 Roper excitation in (d, d') reactions at Td=2.4GeV, Yonezawa Asami; Nagahiro Hideko; Hirenzaki Satoru, 2003, 58, 0, 42, 42
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 12aSH-4 Formation of Mesic Nuclei by (γ, p) reactions, Nagahiro Hideko; Hirenzaki Satoru, 2003, 58, 0, 42, 42
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, σ meson-Nucleus Bound system, Hirenzaki Satoru; Nagahio Hideko, 2003, 58, 0, 35, 35
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, Residual interaction effects on deeply bound pionic states in Sn-isotope, Togawa Naoko; Nagahiro Hideko; Hirenzaki Satoru; Kume Kenji, 2003, 58, 0, 36, 36
  • Refereed, Progress of Theoretical Physics Supplement, PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE, Chiral Symmetry and Meson-Nucleus Bound States, Satoru Hirenzaki, We summarize current research activities on the deeply bound pionic states, η-mesic nuclei, and σ-mesic nuclei, and their relation to the chiral dynamics in hadron physics., 2003, 149, 149, 20, 31
  • Refereed, Progress of Theoretical Physics Supplement, PROGRESS THEORETICAL PHYSICS PUBLICATION OFFICE, Observation of Pionic 1s States in Sn Nuclei and Its Implications on Chiral Symmetry Restoration, K. Suzuki; M. Fujita; H. Geissel; H. Gilg; A. Gillitzer; R. S. Hayano; S. Hirenzaki; K. Itahashi; M. Iwasaki; P. Kienle; M. Matos; G. Münzenberg; T. Ohtsubo; M. Sato; M. Shindo; T. Suzuki; H. Weick; M. Winkler; T. Yamazaki; T. Yoneyama, We observed deeply bound π- 1s states in 115,119,123sn for the first time in 116,120,124Sn(d, 3He) reactions at recoil free conditions to determine the 1s binding energies and the widths precisely. A preliminary result is used to deduce the isovector scattering amplitude as b1 = 0.115 ± 0.005 m π-1. The observed enhancement of b1 over the free πN value infers 35% reduction of fπ2 at the normal nuclear density, ρ = 0.17 fm-3., 2003, 149, 149, 32, 41
  • 日本物理学会講演概要集, 一般社団法人 日本物理学会, 24aXC-2 Possible Enhancement of the formation of deeply bound pionic atoms in halo nuclei, 藤田 雅子; 比連崎 悟; 久米 健次, 2002, 57, 0, 21, 21
  • 日本物理学会講演概要集, 一般社団法人 日本物理学会, 27aXC-5 Medium effects to N^*.resonance and η mesic nuclei, 慈道 大介; 永広 秀子; 比連崎 悟, 2002, 57, 0, 28, 28
  • 日本物理学会講演概要集, 一般社団法人 日本物理学会, 24aWF-3 パイ中間子〓原子の高精度分光実験(2), 進藤 美紀; 藤田 雅子; 大坪 隆; H Gilg; P Kien]e; H Geissei; M Matos; H Weick; M Winkler; G Monzenberg; A Gillitzer; 鈴木 謙; 山崎 敏光; 鈴木 隆敏; 早野 龍五; 板橋 健太; 米山 哲; 佐藤 将春; 岩崎 雅彦; 比連 崎悟, 2002, 57, 0, 31, 31
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, Stnlcture and Formation of η-mesic nuclei in Chiral doublet model, Nagahiro Hideko; Jidob Daisuke; Hirenzaki Satoru, 2002, 57, 0, 36, 36
  • Refereed, HADRON SPECTROSCOPY, AMER INST PHYSICS, Deeply bound 1s and 2p pionic states in Pb-205 and effective pion mass in nuclear matter, H Geissel; H Gilg; A Gillitzer; RS Hayano; S Hirenzaki; K Itahashi; M Iwasaki; P Kienle; M Munch; G Munzenberg; W Schott; K Suzuki; D Tomono; H Weick; T Yamazaki; T Yoneyama, We have succeeded in observing the Is and 2p bound pionic states in Pb-205 nucleus as well separated peaks in the excitation spectrum of the Pb-206(d, He-3) reaction. The observed spectrum agreed quite well with the theoretical prediction where the formation cross section was calculated for the deeply bound picnic states. These states are accommodated in proximity to the nuclear surface as halo states in a potential provided by the attractive Coulomb and the repulsive core. The binding energies and the widths were precisely determined, and the values were used to deduce the unknown s-wave part of the Ti-nueleus interaction and to translate it to the effective pion mass in nuclear matter., 2002, 619, 749, 752
  • Refereed, NUCLEAR PHYSICS IN THE 21ST CENTURY, AMER INST PHYSICS, Deeply bound 1s and 2p pionic states in Pb-205 and effective pion mass in nuclear matter, H Geissel; H Gilg; A Gillitzer; RS Hayano; S Hirenzaki; K Itahashi; M Iwasaki; P Kienle; M Munch; G Munzenberg; W Schott; K Suzuki; D Tomono; H Weick; T Yamazaki; T Yoneyama, Recently we have succeeded in observing the 1s and 2p bound pionic states in Pb-205 nucleus as well separated peaks in the excitation spectrum of the Pb-206(d,He-3) reaction. The observed spectrum agreed quite well with the theoretical prediction where the formation cross section was calculated for the deeply bound pionic states [1]. These states are accommodated in proximity to the nuclear surface as halo states in a potential provided by the attractive Coulomb and the repulsive core. The binding energies and the widths were precisely determined, and the values were used to deduce the unknown s-wave part of the pi-nucleus interaction and to translate it to the effective pion mass in nuclear matter., 2002, 610, 1019, 1023
  • Refereed, HADRON AND NUCLEAR PHYSICS WITH ELECTROMAGNETIC PROBES, ELSEVIER SCIENCE BV, Quasi-deuteron picture for He-3 and He-4 photodisintegration, S Hirenzaki; Y Umemoto; K Kume, We have developed a phenomenological quasi-deuteron model to describe photodisintegration reactions of He-3 and He-4 at intermediate photon energies and compared the results with experimental data obtained by the TAGX group in which contributions from photon absorption by pn pairs were selectively observed. The data can be reproduced reasonably well. However there still remain certain discrepancies between calculated results and data., 2001, 177, 182
  • Refereed, Pramana - Journal of Physics, INDIAN ACADEMY SCIENCES, Chiral unitary theory: Application to nuclear problems, E. Oset; D. Cabrera; H. C. Chiang; C. Garcia Recio; S. Hirenzaki; S. S. Kamalov; J. Nieves; Y. Okumura; A. Ramos; H. Toki; M. J. Vicente Vacas, In this talk we briefly describe some basic elements of chiral perturbation theory, χPT, and how the implementation of unitarity and other novel elements lead to a better expansion of the T-matrix for meson-meson and meson-baryon interactions. Applications are then done to the ππ interaction in nuclear matter in the scalar and vector channels, antikaons in nuclei and K- atoms, and how the φ meson properties are changed in a nuclear medium., 2001, 57, 2-3, 417, 431
  • Refereed, Nuclear Physics A, ELSEVIER SCIENCE BV, Structure and formation of deeply bound pionic atoms, Satoru Hirenzaki; Hiroshi Toki, We discuss some recent developments of the theoretical studies for the structure and formation of the deeply bound pionic atoms, which were found experimentally using (d,3He) reactions., 08 May 2000, 670, 1-4, 194, 197
  • Refereed, Nuclear Physics A, Observation of well-resolved 1s and 2p π- states in Pb by high resolution (d,3He) spectroscopy, A. Gillitzer; H. Geissel; H. Gilg; R. S. Hayano; S. Hirenzaki; K. Itahashi; M. Iwasaki; P. Kienle; M. Münch; G. Münzenberg; W. Schott; K. Suzuki; D. Tomono; H. Weick; T. Yamazaki; T. Yoneyama, The formation of deeply bound pionic states in Pb has been studied experimentally in 208Pb(d,3He) and, very recently, in 206Pb(d,3He) reactions. The 208Pb(d,3He) experiment has been fully analysed and its result is compared to model predictions. In the 206Pb(d,3He) reaction the pionic 1s state was observed as a well-separated peak in the excitation energy spectrum., 31 Jan. 2000, 663-664, 1-2, 206c, 209c
  • Refereed, Nuclear Physics A, Physics of mesic atoms and mesic nuclei -structure and formation-, S. Hirenzaki; T. Hatsuda; K. Kume; T. Kunihiro; H. Nagahiro; Y. Okumura; E. Oset; A. Ramos; H. Toki; Y. Umemoto, We have studied the structure and formation of mesic atoms and mesic nuclei theoretically. The latest results on the deeply bound pionic atoms, the kaonic atoms and the sigma states are reported., 31 Jan. 2000, 663-664, 1-2, 553c, 556c
  • Refereed, Acta Physica Polonica B, ACTA PHYSICA POLONICA B, JAGELLONIAN UNIV, INST PHYSICS, Chiral unitary approach to the K̄ nucleus interaction and kaonic atoms, E. Oset; S. Hirenzaki; Y. Okumura; A. Ramos; H. Toki; M. J. Vicente Vacas, We review recent work on various topics related to the modification of kaon properties in nuclei. After a brief exposition of the K̄N and K̄ nucleus interaction, results from the application to K- atoms, renormalization of the f0 and a0 scalar resonances in nuclei and φ decay in the nucleus are shown., 2000, 31, 10-11, 2285, 2294
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 26aSH-3 Formation of deeply bound pionic ls states by(d,^3He)reaction, UMEMOTO Yukiko; HIRENZAKI Satoru; TOKI Hiroshi; KUME Kenji, 1999, 54, 0, 42, 42
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 24aSC-1 Deeply Bound Pionic States-Formation and Interests, HIRENZAKI Satoru, 1999, 54, 0, 51, 51
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 24aSC-4 Search for bound η-and ω-nuclear states, SUZUKI K; GILG H; KIENLE P; MUNZENBERG G; GEISSEL H; ITABASHI K; HAYANO R.S; TANIDA K; IWASAKI M; YAMAZAKI T; HIRENZAKI S; TOKI H; Gillitzer A; SCHOTT W, 1999, 54, 0, 51, 51
  • 日本物理学会講演概要集, 一般社団法人 日本物理学会, 30p-YH-6 π中間子の鉛原子核による深い束縛状態の探索実験(V), 米山 哲; Munzenbreg G.; Geissel H.; Weick H.; Gillitzer A.; Schott W.; Munch M.; Kienle P.; 岩崎 雅彦; 友野 大; 板橋 健太; 早野 龍五; 鈴木 謙; Gilg H.; 山崎 敏光; 比連崎 悟, 1999, 54, 0, 70, 70
  • Not Refereed, Chap.8 in 'Nucleon-Hadron Many Body Systems -From Hadron-Meson to Quark-Lepton Nuclear Physics' Oxford Science Pub. Eds. H. Ejiri and H. Toki, Deeply Bound Pionic Atoms (共著), HIRENZAKI Satoru; H. Toki, 1999, Chap. 8
  • Not Refereed, パリティ, 丸善, パイ中間子原子の深部構造, 比連崎 悟, May 1998, 13, 5, 23, 30
  • Not Refereed, Parity, Structure of Deeply Bound Pionic Atoms, HIRENZAKI Satoru; S. Hirenzaki, 1998, 5, 23, 30
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 6a-C-12 Proton Elastic Scattering and Neutron Distribution of Unstable Nuclei, KAKI Kaori; HIRENZAKI Satoru, 1998, 53, 0, 44, 44
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 31p-F-12 Photon absorption on a neutron-proton pair in ^3He and ^4He, UMEMOTO Yukiko; HIRENZAKI Satoru; KUME Kenji, 1998, 53, 0, 36, 36
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, Detamination of the optical from the deephy bowndpionic atom for deformed nucleus, NOSE-TOGAWA N.; HIRENZAKI S.; KUME K., 1998, 53, 0, 44, 44
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 2a-F-2 Structure of Deeply Bound Pionic Atoms, HIRENZAKI S.; KANEYASU H.; KUME K.; TOKI H., 1998, 53, 0, 44, 44
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 22p-B-4 Formation of Mesic Nucleus by Direct Reactions, Hirenzaki S.; Toki H., 1997, 52, 0, 45, 45
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 23a-A-4 Photon absorption on a neutron-proton pair in ^3He, Umemoto Yukiko; Hirenzaki Satoru; Kume Kenzi, 1997, 52, 0, 47, 47
  • Refereed, N* PHYSICS, WORLD SCIENTIFIC PUBL CO PTE LTD, N* resonances and 2 pi production, E Oset; JA Gomez-Tejedor; F Cano; S Hirenzaki; PF de Cordoba; L Alvarez-Ruso; MJ Vicente-Vacas, We discuss the repercussion of the N* (1520) resonance in the gamma N --> pi pi N reaction from where one extracts novel information on the decay properties of this resonance, which offers a new challenge to quark models of the baryons. On the other hand we show the results of the analysis of the (alpha,alpha') reaction on a proton target exciting the Roper resonance with an isoscalar source. This novel excitation channel of the Roper is found to play a major role in the NN --> NN pi pi reaction close to threshold., 1997, 4, 233, 242
  • 日本物理学会講演概要集(分科会), Proton-Nucleus Elastic Scattering In Impulse Approximation And Neutron Distributions of Ca Isotopes., 嘉規香織; 比連崎悟, 1997, 1997
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 9p-F-11 Formation of Deeply Bound Pionic atoms by (d, ^3He) reactions, Hirenzaki S.; Takahashi K.; Toki H., 1996, 1996, 0, 103, 103
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 9p-F-12 Strong interaction quadrupole effects in Deeply Bound Pionic Atoms, Nose N.; Hirenzaki S.; Kume K., 1996, 1996, 0, 103, 103
  • Refereed, Nuclear Physics, Section A, ELSEVIER SCIENCE BV, Mecroscopic kaonic atom optical potential in finite nuclei with Λ(1405) and Σ(1385) resonances and kaonic helium, Masaki Mizoguchi; Satoru Hirenzaki; Hiroshi Toki, 13 Mar. 1995, 585, 1-2, 349, 350
  • Refereed, Nuclear Physics, Section A, ELSEVIER SCIENCE BV, Deeply bound pionic atoms on unstable nuclei, S. Hirenzaki, 13 Mar. 1995, 585, 1-2, 251, 254
  • Soryushiron Kenkyu Electronics, Soryushiron Kenkyu Editorial Office, Reactions of Neutron Rich Nuclei at Intermediate Energies, Hirenzaki Satoru, 1995, 91, 5, E61, E66
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 4a-E-8 (^3He, t) Reactions on Unstable Nuclei, HIRENZAKI Satoru; FUKUNISHI Nobunao; HIRATA D.; KITAGAWA Hisashi, 1993, 1993, 0, 73, 73
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 28p-P-11 K^-atom optical potential, Mizoguchi Masaki; Hirenzaki Satoru; Toki Hiroshi, 1992, 47, 0, 27, 27
  • Refereed, INTERNATIONAL WORKSHOP ON PIONS IN NUCLEI, WORLD SCIENTIFIC PUBL CO PTE LTD, FORMATION OF DEEPLY BOUND PIONIC ATOMS, S HIRENZAKI; H TOKI; T YAMAZAKI, 1992, 345, 354
  • Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 30a-L-3 The P+^<9.11> Li elastic scattering, Hirenzaki Satoru, 1992, 47.1, 29
  • Refereed, Nuclear Physics A, Elsevier BV, Structure and formation of deeply bound pionic atoms, H. Toki; S. Hirenzaki; T. Yamazaki; R.S. Hayano, May 1991, 527, 455, 458
  • Not Refereed, Meeting Abstracts of the Physical Society of Japan, The Physical Society of Japan, 11a-G-12 Topological Defects in Gauge Theory and Multidimensional Cosmology, Nakamura A.; Shiraishi K.; Hirenzaki S., 1989, 1989, 0, 1, 1
  • 秋の分科会予稿集, 一般社団法人 日本物理学会, 10p-G-5 Pionic atom of unstable nuclei, 比連崎 悟; 梶野 敏貴; 土岐 博; 久保 謙一; 谷畑 勇夫, 1986, 1986, 0, 66, 66
  • 日本物理学会講演概要集, 一般社団法人日本物理学会, 28pSN-5 η中間原子核で見るバリオンのカイラル対称性と媒質効果, 永廣 秀子; 慈道 大介; 比連 崎悟, 06 Mar. 2003, 58, 1, 65, 65
  • 日本物理学会講演概要集, 一般社団法人日本物理学会, 24aWF-4 パイ中間子〓原子の高精度分光実験(3), 鈴木 謙; 鈴木 隆敏; 進藤 美紀; 早野 龍五; 板橋 健太; 米山 哲; 佐藤 将春; 岩崎 雅彦; 比連崎 悟; 藤田 雅子; 大坪 隆; H Gilg; P Kienle; H Geissel; M Matos; H Weick; M winkler; G Mifnzenberg; A Gillitzer; 山崎 敏光, 01 Mar. 2002, 57, 1, 31, 31
  • Soryushiron Kenkyu, Soryushiron Kenkyu, Kaonic atom optical potential, Mizoguchi Masaki; Hirenzaki Satoru; Toki Hiroshi, We discuss how kaon-nucleus interaction is described by using the kaon-nucleon scattering data. Here, we report kaonic atom optical potential. We obtain microscopic kaonic atom optical potential in finite nuclei taking into account the K-NΛ(1405) and K-NΣ(1385) interactions. The experimental kaonic atom data (Z>2) are reproduced well. The details of this report are found in Ref., 20 Jul. 1995, 91, 4, D38, D44
  • Abstracts of the meeting of the Physical Society of Japan. Annual meeting, The Physical Society of Japan (JPS), 1a-ZM-11 A general formula of the coalescence model, Hirenzaki S.; Suzuki T.; Tanihata I., 16 Mar. 1993, 48, 1, 88, 88

Books etc

  • 中間子原子の物理 : 強い力の支配する世界, 共立出版, 比連崎, 悟, Mar. 2017, vi, 171p, 図版2枚, 1-171, False, 9784320035355, cinii_books

Presentations

  • 山縣淳子; 比連崎悟, 日本物理学会第77回年次大会, K 中間子ヘリウム原子の高精度測定から考察する K 中間子-原子核 相互作用, Oral presentation, 17 Mar. 2022, 15 Mar. 2022, 19 Mar. 2022
  • Satoru Hirenzaki, Reimei workshop 'Hadrons in dense matter at J-PARC', Recent topics on pi, K, eta(958) mesonic bound states, Invited oral presentation, 23 Feb. 2022, 21 Feb. 2022, 23 Feb. 2022
  • 池野なつ美; 比連崎悟, 日本物理学会2021年秋季大会(素核宇分野), 深く束縛されたπ中間子原子観測量の πN σ項 依存性, Oral presentation, 16 Sep. 2021, 14 Sep. 2021, 17 Sep. 2021
  • 野瀬-外川直子; 池野なつ美; 山縣淳子; 比連崎悟, 日本物理学会2021年秋季大会(素核宇分野), 中間子原子および中間子原子核における残留相互作用効果, Oral presentation, 16 Sep. 2021, 14 Sep. 2021, 17 Sep. 2021
  • Satoru Hirenzaki, APCTP(Asia Pacific Center for Theoretical Physics) Focus Program in Nuclear Physics 2021 Part I: Hadron properties in a nuclear medium from the quark and gluon degrees of freedom, Structure and formation of mesic atoms and mesic nuclei, Invited oral presentation, 15 Jul. 2021, 14 Jul. 2021, 16 Jul. 2021
  • Satoru Hirenzaki, Workshop series on Nuclear Physics-2, Hadrons in nuclear matter, Structure and Formation of Meson-Nucleus bound systems, Invited oral presentation, 13 Dec. 2019, 13 Dec. 2019, 13 Dec. 2019
  • Satoru Hirenzaki, Workshop on Chiral and heavy quark symmetries in quark-hadron physics, Formation of Mesonic Atoms and Mesonic Nuclei, Invited oral presentation, 25 Aug. 2019, 25 Aug. 2019, 25 Aug. 2019
  • Satoru Hirenzaki, 3rd Jagiellonian Symposium on Fundamental and Applied Subatomic Physics, Recent topics on Mesic atoms and Mesic nuclei, Invited oral presentation, 24 Jun. 2019, 23 Jun. 2019, 30 Jun. 2019
  • Satoru Hirenzaki, International Workshop on “Hadron structure and interaction in dense matter”, Meson Properties at Finite Density from Meson-Nucleus Systems, Invited oral presentation, 11 Nov. 2018, 11 Nov. 2018, 12 Nov. 2018
  • S. Hirenzaki, J-PARCエネルギー領域重イオン衝突のダイナミクス, Meson Properties at Finite Density from Meson-Nucleus Systems, Invited oral presentation, 11 Sep. 2017, 11 Sep. 2017, 11 Sep. 2017
  • S. Hirenzaki, 2nd Jagiellonian Symposium On Fundamental and Applied Subatomic Physics, eta-nucleus interaction from the d+d reaction around the eta production threshold, Invited oral presentation, 06 Jun. 2017, 04 Jun. 2017, 11 Jun. 2017
  • Satoru Hirenzaki, 日本物理学会第72回年次大会, η-nucleus interaction from the d + d reaction around the η production threshold, Oral presentation, 20 Mar. 2017, 17 Mar. 2017, 20 Mar. 2017
  • Satoru Hirenzaki, KEK theory center workshop on Hadron and Nuclear Physics in 2017 (KEK-HN-2017), Meson properties from mesic atoms and mesic nuclei, Invited oral presentation, 09 Jan. 2017, 07 Jan. 2017, 10 Jan. 2017
  • S. Hirenzaki, 小規模研究会「中間子原子核の最前線」, 中間子原子核研究の意義と目的, Oral presentation, 20 Dec. 2016
  • S. Hirenzaki, 東北大ELPH拠点研究会「マルチフレーバーで探るエキゾチックハドロンとハドロン多体系の物理」, d + d 反応による eta 中間子原子核生成 ー eta-原子核相互作用の導出に関して, Oral presentation, 02 Dec. 2016
  • 比連崎悟, 討論型研究会「中間子と核子・原子核の相互作用」, d + d 反応によるeta 中間子原子核生成 ー いかにeta-原子核相互作用の情報を引き出すか?ー, Oral presentation, 13 Oct. 2016
  • 比連崎悟, ELPH FOREST ワークショップ(ELPH セミナー), 中間子--原子核系で探る物理と最近の話題, Invited oral presentation, 24 May 2016
  • S. Hirenzaki, International workshop on Progress on J-PARC hadron physics in 2016, Meson Properties at finite density from Meson Nucleus Systems, Invited oral presentation, 04 Mar. 2016, 02 Mar. 2016, 04 Mar. 2016
  • S. Hirenzaki, 1st Hadron Spanish Network Days and Spanish-Japanese JSPS Workshop, Salon de Actos del Parc Cientific, IFIC (Institute de Fisica Corpuscular, Meson Properties at finite density from meson-nucleus systems, Oral presentation, 15 Jun. 2015
  • S. HIrenzaki, The Jagiellonian Symposium on Fundamental and Applied Subatomic Physics, Collegium Maius of the Jagiellonian University in Krakow, June 7th - 13th, 2015., Meson Properties at Finite Density from Meson Nucleus Systems, Invited oral presentation, 10 Jun. 2015
  • S. Hirenzaki, Fourth Joint Meeting of the Nuclear Physics Dvision of the American Physical Society and The Physical Society of Japan (HAWAII2014), October 7-11, 2014, Hilton Waikoloa Village, Hawaii Island, Hawaii, USA, Formation of Mesonic Atoms and Mesonic Nuclei, Oral presentation, 09 Oct. 2014
  • S. Hirenzaki, II International Symposium on Applied Nuclear Physics and Innovative Technologies, September 24th - 27th 2014, Collegium Maius, Jagiellonian University, Kraków, Poland., Exotic Atoms and Exotic Nuclei, Invited oral presentation, 26 Sep. 2014

Research Projects

  • 基盤研究(C), Apr. 2016, Mar. 2021, 16K05355, Principal investigator, 核媒質中における中間子の精密研究と強い相互作用の対称性, 比連崎 悟, 日本学術振興会, 科学研究費助成事業 基盤研究(C), 奈良女子大学, 4420000, 3400000, 1020000, 本研究課題では、原子核と中間子が近接して存在する系において、強い相互作用の新しい知見を得ることを目的としている。特に、以前の研究よりも定量的で精密な情報を得ることを目指している。今年度の研究実績としては、π中間子原子に関しては理化学研究所で2014年に2回目に行われた実験結果の精密な解析を進展させた。理研、東工大、鳥取大との共同研究を更に進展させて、2020年度中に成果を論文として公表することを計画している。 η中間子原子核に関しては、実験グループとの共同研究から、軽い原子核に束縛されたη中間子が、複数(2個もしくは6個)の光子に崩壊する過程を研究し実験結果の解釈に関して論文を公表する事が出来た。 η(958) 中間子原子核に関しては、強い相互作用によって原子核が変形する可能性を、相対論的平均場理論を用いて理論的に指摘し、論文として公表する事ができた。今後は、生成断面積に与える変形の影響に関しても定量的に研究を進めたい。 K中間子と原子核の系に関しては、K原子の状態に現れる強い相互作用による斥力的な準位シフトの起源として、ポテンシャル的な記述においては、吸収効果(ポテンシャルの虚部)が本質的に重要であって、核の内側に存在するK核状態とのレベル反発によるグローバルな解釈は難しい事が示された。この結果も2020年度中に論文として公表を目指している。 昨年度から開始した反陽子原子からの中間子-原子核束縛系の生成に関しては、2020年度に更に検討をすすめ、核内に束縛される中間子が反跳を受けない運動学での生成過程を検討したいと考えている。
  • Grant-in-Aid for Scientific Research (C), Apr. 2012, Mar. 2016, 24540274, Principal investigator, Aspects of symmetry at finite nuclear density by meson-nucleus systems, Hirenzaki Satoru; JIDO Daisuke; NAGAHIRO Hideko, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Nara Women's University, 5070000, 3900000, 1170000, The final goal of this research is to investigate the aspects of the symmetry of the strong interaction by knowing the properties of various mesons at finite density through meson-nucleus systems. The pattern of the symmetry breaking and its restoration are considered to be understood by the relations between various phenomena and properties of various mesons. This kind of study is unique and complementary to that of the high energy heavy ion collisions. The main results of this project are the developments of the theoretical studies of (i) the structure and formation of eta(958) meson-nucleus bound states based on eta(958) properties at finite density, (ii) the high precision spectroscopy of the deeply bound pionic atoms, and (iii) the properties of vector mesons at finite density and observables., url
  • Grant-in-Aid for Scientific Research (C), 2008, 2011, 20540273, Principal investigator, Mesic Nuclei and Finite Density QCD, HIRENZAKI Satoru; JIDO Daisuke, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Nara Women's University, 4290000, 3300000, 990000, We have studied various meson-nucleus systems theoretically to know the modification of meson properties in nucleus and to understand the aspects of symmetries of strong interaction at finite density. We have obtained the new information on strong interaction effects at finite density, structure of bound states, and formation cross sections for the systems of pionic atoms, Kaonic nuclei,η-,η(958)-, andφ-mesic nuclei systematically. We have also studied the possibility to apply the two nucleon transfer reactions to the formation of the heavy meson and nucleus systems., url;url
  • Grant-in-Aid for Scientific Research on Priority Areas, 2005, 2009, 17070002, Coinvestigator, Theoretical Study of Exotic Multi-Quark and Multi-Hadron Systems, OKA Makoto; HIRENZAKI Satoru; KUNIHIRO Teiji; HARADA Toru; HOSAKA Atsushi; HATSUDA Tetsuo; OHNISHI Akira; HIYAMA Emiko; FUJIWARA Yoshikazu; MORIMATSU Osamu; ISHII Noriyoshi; YASUI Shigehiro; OHTANI Munehisa; ENDO Tomoki; TAKAHASHI Toru; NAM Seung-Il; UMEYA Atsushi; SASAKI Kenji; MIURA Kotaro; SASAKI Kiyoshi; MATSUO Mamoru, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Priority Areas, Tokyo Institute of Technology, 62800000, 62800000, Three major subjects, A.Hadron Spectroscopy, B.Hadronic Matter, C.Hypernuclear Spectroscopy, have been extensively explored by organizing theoretical research groups all over in Japan. We focused our efforts on collaborations with experimental physicists carrying out experiments at SPring-8 and J-PARC etc., and also on to educate and encourage young students and post-doc researchers in these fields. We have achieved major development in the areas of exotic hadron spectroscopy including pentaquarks, possible K nucleus states, dense QCD and its phase structure, gamma spectroscopy of hypernuclei and generalized nuclear force, lattice QCD computation of baryon-baryon interactions, structure of double hypernuclei., url
  • Grant-in-Aid for Scientific Research (C), 2004, 2006, 16540254, Principal investigator, Partial Restoration of Chiral Symmetry in Nuclear Medium and Mesic Atoms, HIRENZAKI Satoru, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Nara Women's University, 3500000, 3500000, We have investigated the partial restoration of Chiral Symmtery in Nuclear Medium by considering the structure and formation of various mesic atoms and mesic nuclei like pionic atoms, kaonic atoms, kaonic nuclei, eta mesic nuclei, and eta(958) mesic nuclei. We have considered several microscopic theories to study the meson properties in nuclear medium to evaluate the binding energies and decay widths of mesic states in nuclei. We have also considered seriously the experimental feasibilities to observe these staes in realistic conditions which can be performed in the present facilities like Spring8, J-PARC, and RIBF. Ours main results are followings, (i) Structure and Formation of kaonic atoms are studied theoretically using the chiral unitary optical potential and the Green function method in addition to the effective number approach. We have concluded that the naive interpretation of the observed (K, N) spectrum as the indications of the kaonic nuclear states is very dangerous and must be chenked seriously. (ii) Eta and Eta (958) mesic nuclei is studied using the effective chiral NJL laglangian. We calculated the mass shift of the eta and eta(958) in nucleus and predicted the binding energies and widths of these states. One of the most interesting point of these staes is that the very heavy eta (958) mass is believed to be closely related to the U(1) quantum anomaly. We can expect to have the first experimental results of the medium effects on the quantumu anomaly. The theoretical predictions of the formation rate of these states are performed.
  • Grant-in-Aid for Scientific Research (C), 2002, 2003, 14540268, Principal investigator, In-medium Meson properties and Nuclear Exotres., HIRENZAKI Satoru, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Nara Women's University, 3500000, 3500000, The properties of eta-nucleus interaction and their experimental consequences are investigated with eta-nucleus optical potentials obtained by postulating the N^*(1535) dominance for eta-N system. The N^*(1535) properties in nuclear medium are evaluated by two kinds of chiral effective models based on distinct pictures of N^*(1535). We find that these two models provide qualitatively different optical potentials of the eta meson, reflecting the in-medium properties of N^*(1535) in these models. In order to compare these models in physical observables, we calculate spectra of (d,3He) reactions for the eta mesic nucleus formation with various kinds of target nuclei. We show that the (d,3He) spectra obtained in these models are significantly different and are expected to be distinguishable in experiments. We also explore the possibility to observe an enhanced 2pi correlation in the scalar iso-scalar (sigma) channel in nuclei by (d,t) and (d,^3He) reactions to obtain new information on the partial restoration of chiral symmetry in the nuclear medium. The sensitivity of the reaction spectra on the change of the chiral condensate in the nuclear medium is examined.

Ⅲ.社会連携活動実績

1.公的団体の委員等(審議会、国家試験委員、他大学評価委員,科研費審査委員等)

  • Apr. 2021, Mar. 2022
  • Apr. 2020, Mar. 2021
  • Apr. 2019, Mar. 2021
  • Apr. 2019, Mar. 2020
  • Apr. 2019, Mar. 2021
  • Apr. 2011, Mar. 2012
  • Oct. 2009, Sep. 2010, Society
  • Apr. 2010, Mar. 2011
  • Oct. 2008, Sep. 2009, Society
  • May 1999, Apr. 2000, Society


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