Supernova neutrino process and its impact on the galactic chemical evolution of the light elements

In order to resolve the overproduction problem of ¹¹B 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 ¹¹B and ⁷Li depend strongly on the temperature of ν _μ,τ and ν̄_μ,τ and are roughly proportional to the total neutrino energy. The range of temperature of ν_μ,τ and ν̄_μ,τ appropriate for the amount of ¹¹B 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 %.