Neutrino Process in Core-collapse Supernovae with Neutrino Self-interaction and MSW Effects

We calculate the abundances of ⁷Li, ¹¹B, ⁹²Nb, ⁹⁸Tc, ¹³⁸La, and ¹⁸⁰Ta produced by neutrino (ν)-induced reactions in a core-collapse supernova explosion. We consider the modification by ν self-interaction (ν-SI) near the neutrinosphere and the Mikheyev–Smirnov–Wolfenstein (MSW) effect in the outer layers based on time-dependent neutrino energy spectra. Abundances of ⁷Li and the heavy isotopes ⁹²Nb, ⁹⁸Tc, and ¹³⁸La are reduced by a factor of 1.5–2.0 by the ν-SI. In contrast, ¹¹B is relatively insensitive to the ν-SI. We find that the abundance ratio of heavy to light nuclei, ¹³⁸La/¹¹B, is sensitive to the neutrino mass hierarchy, and the normal mass hierarchy is more likely to be consistent with the solar meteoritic abundances.