Research Projects

• 基盤研究(C), 01 Apr. 2023 - 31 Mar. 2027, 23K03417, π, K, η(958) 中間子-原子核系で探る有限密度での量子色力学の対称性, 比連崎 悟; 山縣 淳子; 池野 なつ美, 日本学術振興会, 科学研究費助成事業, 奈良女子大学, 3900000, 3000000, 900000, kaken

  対象リソースIRI
• Grant-in-Aid for Scientific Research (C), Apr. 2016 - Mar. 2021, 16K05355, Accurate studies of the meson properties in the nuclear medium and symmetry of the strong interaction, Hirenzaki Satoru, Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Nara Women's University, 4420000, 3400000, 1020000, The purpose of the present project is to investigate the meson properties in the nucleus as accurately as possible and to deduce the new information on the strong interaction symmetry at finite density from them.
  In this project, we made collaborations for researches on deeply bound pionic atoms at RIKEN, eta and eta(958) mesic nucleus at COSY and GSI in Germany, and kaonic nucleus at JPARC, and we obtained new information on properties of each meson. Based on the new information, we are trying to deepen our understandings of the strong interaction symmetry., kaken

  対象リソースIRI
• Grant-in-Aid for Scientific Research (C), Apr. 2012 - Mar. 2016, 24540274, 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

  対象リソースIRI
• Grant-in-Aid for Scientific Research (C), 2008 - 2011, 20540273, 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

  対象リソースIRI
• Grant-in-Aid for Scientific Research on Priority Areas, 2005 - 2009, 17070002, 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

  対象リソースIRI
• Grant-in-Aid for Scientific Research (C), 2004 - 2006, 16540254, 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., kaken

  対象リソースIRI
• Grant-in-Aid for Scientific Research (C), 2002 - 2003, 14540268, 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.
• 基盤研究(C), Apr. 2023 - Mar. 2027, 23K03417, π, K, η(958) 中間子-原子核系で探る有限密度での量子色力学の対称性, 日本学術振興会, 科学研究費助成事業 基盤研究(C)