Supernova Neutrino Process and its Impact on the Galactic Chemical Evolution of the Light Elements

In order to resolve the overproduction problem of B in supernova explosions during Galactic chemical evolution, the dependence of the ejected masses of the light elements produced through the ν-process in supernova explosions on supernova neutrino parameters is investigated and constraints on the supernova neutrinos are evaluated. Detailed nucleosynthesis in a supernova explosion model corresponding to SN 1987A is calculated by postprocessing. The ejected masses of B and Li depend strongly on the temperature of νμ,τ and ν̄μ,τ and are roughly proportional to the total neutrino energy. The range of temperature of νμ,τ and ν̄μ,τ appropriate for the amount of B necessary for Galactic chemical evolution and the total neutrino energy deduced from the gravitational energy of a typical neutron star is between 4.8 MeV and 6.6 MeV. In the case of neutrino energy spectra with non-zero chemical potential, this range decreases by about 10 %.