Effects of shock propagation on neutrino oscillation and ν-induced nucleosynthesis in supernova ^∗

We discuss effects of shock propagation on neutrino (ν) oscillation in supernova environment, which affects directly ν-induced nucleosynthesis. Since electron number density varies rapidly behind and in front of the shock, multiple resonances of mixing angles by adiabatic and/or non-adiabatic electron density change can occur during the shock propagation. In this work, we report detailed analysis of the ν oscillation in matter and the ν-induced nucleosynthesis by the shock propagation. The shock effects increase abundances by about 16% of ¹³⁸ La, 14% of ⁹² Nb and 7% of ⁹⁸ Tc, whose main synthesized region is O–Ne–Mg layer in our supernova model. Here, we adopt a simple thermal bomb hydrodynamic model and the normal ν-mass hierarchy.