Shell-model study of spin modes in nuclei and nuclear forces

11th International Spring Seminar on Nuclear Physics: Shell Model and Nuclear Structure – achievements of the past two decades

Suzuki, Toshio^1 ; Otsuka, Takaharu^2 ; Honma, Michio^3 ; Tsunoda, Naofumi^4

Department of Physics, College of Humanities and Sciences, Nihon University, Sakurajosui 3-25-40, Setagaya-ku, Tokyo

156-8550, Japan^1

Department of Physics, Center for Nuclear Study, University of Tokyo, Hongo, Bunkyo-ku, Tokyo

113-0033, Japan^2

Center for Mathematical Sciences, University of Aizu, Aizu-Wakamatsu, Fukushima

965-8580, Japan^3

Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo

113-0033, Japan^4

关键词: Calcium isotopes;    Core-polarization effects;    Light element synthesis;    Neutrino-nucleus reactions;    Oscillation parameters;    Spin degrees of freedom;    Supernova explosion;    Tensor interaction;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/580/1/012032/pdf
DOI  :  10.1088/1742-6596/580/1/012032

来源: IOP

【 摘 要 】

Spin-dependent modes in nuclei are studied by shell-model method with the use of new shell-model Hamiltonians which properly take into account important roles of tensor interactions. New Hamiltonians can describe spin degrees of freedom in nuclei remarkably well. Nuclear weak processes at stellar environments are investigated based on these successes. New neutrino-nucleus reaction cross sections on12C are applied to light-element synthesis in supernova explosions. The production rate for11B/7Li is pointed out to be useful to determine v-oscillation parameters, in particular, v-mass hierarchy. New e-capture rates in Ni isotopes are obtained and implications for element synthesis are discussed. The monopole-based universal interaction is applied to study structure of p-sd shell nuclei and40Ar as well as v-induced reactions on40Ar. Repulsive corrections in the isospin T=1 monopoles are shown to be important for proper shell evolutions in neutron-rich carbon isotopes. The repulsive correction is pointed out to be due to three-body forces, in particular, the Fujita-Miyazawa force. Roles of the three-body forces on the shell evolution of neutron-rich calcium isotopes, the closed- shell nature of48Ca and M1 transition in48Ca are studied on top of the two-body G-matrix obtained by including core-polarization effects in larger spaces (≤24ω). Effects of the inclusion of g9/2-shell are also discussed.