Abstract
Nuclear weak processes are investigated based on new shell model Hamiltonians, which give successful description of spin responses in nuclei, and applied to astrophysical problems. Neutrino-induced reactions on 12C and synthesis of light elements by supernova neutrinos, and effects of contamination of 13C, whose natural isotopic abundance is 1.1%, on inclusive ν-12C reactions are discussed. Spin-dipole transitions and ν-induced reactions on 16O are studied by using a new Hamiltonian with proper tensor components, and compared with conventional calculations and previous CRPA results. Gamow-Teller transition strength in 40Ar and ν-induced reactions on 40Ar by solar neutrinos are studied based on monopole-based-universal interaction (VMU). We finally discuss electron capture reactions on Ni isotopes in stellar environments.
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