Neutrino Oscillation Effects on Supernova Light Element Synthesis

Neutrino oscillations affect light-element synthesis through the -process in supernova explosions. The Li and B yields produced in a supernova explosion of a 16.2 M star model increase by factors of 1.9 and 1.3 in the case of the large mixing angle solution with a normal mass hierarchy and sin2 13k 2 ; 10 3 compared with those without the oscillations. In the case of an inverted mass hierarchy or a nonadiabatic 1-3 mixing resonance, the increment of their yields is much smaller. Neutrino oscillations raise the reaction rates of charged-current -process reactions in the region outside oxygen-rich layers. The number ratio of Li/B could be a tracer of a normal mass hierarchy and a relatively large 13, still satisfying sin 2 13 0:1, through future precise observations in stars having strong supernova components. Subject headingg s: neutrinos — nuclear reactions, nucleosynthesis, abundances — supernovae: general