NEUTRINO OSCILLATION EFFECTS ON SUPERNOVA LIGHT-ELEMENT SYNTHESIS

摘要

Neutrino oscillations affect light-element synthesis through the v-process in supernova explosions. The ~7Li and ~(11)B yields produced in a supernova explosion of a 16.2 solar mass 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 sin~2 2θ_(13) approx > 2 x 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 v-process reactions in the region outside oxygen-rich layers. The number ratio of ~7Li/~(11)B could be a tracer of a normal mass hierarchy and a relatively large θ_(13), still satisfying sin~2 2θ_(13) ≤ 0.1, through future precise observations in stars having strong supernova components.