Abstract:
Neutrino-nucleus reactions on $fp$-shell and $p$-shell nuclei are
investigated based on new shell model Hamiltonians.
We mainly discuss neutrino-induced reactions on Ni and Fe isotopes
and possible consequences on nucleosynthesis in stars.
The calculated charged current reaction cross section on $^{56}$Fe induced
by decay-at-rest (DAR) neutrinos is shown to be consistent with the
observation.
The Gamow-Teller strength in $^{56}$Ni is found to be more spread compared
to previous calculations and result in a considerably large branching ratio
for the proton knock-out channel. As a consequence of this,
the production yields of heavy elements such as $^{55}$Mn and $^{59}$Co
in population III stars are shown to be enhanced for the new Hamiltonian.
The electron capture reactions on Ni and Fe isotopes, and neutrino-induced
reactions on $^{52}$Fe are also discussed.