Abstract
Neutrino-nucleus reactions on 12C and 16O are investigated by shell model calculations with the use of new shell model Hamiltonians for p-shell and p – sd-shell. The new Hamiltonians can describe spin modes in nuclei quite successfully, for example, the Gamow-Teller (GT) transitions in 12C and 14C. New reaction cross sections are compared with previous calculations. Possible implications on nucleosynthesis in supernova explosions are discussed. Electron capture reaction rates are evaluated by using new shell model Hamiltonians in fp-shell, which can describe magnetic dipole transitions and GT transitions quite nicely. Capture rates for Ni and Co isotopes in stellar environments are evaluated. The calculated rates in 58Ni and 60Ni are found to reproduce well the rates obtained by using experimental GT strengths.
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