The 17th CNS International Summer School (CNSSS18)

Neutrino self-interaction and MSW effect on the neutrino-process in core-collapse supernovae

23 Aug 2018, 16:25

15m

Nishina Hall

oral contribution YSS

Speaker

Ms Heamin Ko (Soongsil University)

Description

We investigate the nuclear abundances uniquely produced from the neutrino-process in supernova (SN) explosion. We calculate the neutrino flux propagation and its modification by neutrino self-interactions near the neutrino-sphere along with the Mikheyev-Smirnov-Wolfenstein (MSW) mixing in the outer envelopes. We compute the neutrino-induced nucleosynthesis of ${}^7$Li, ${}^{11}$B, ${}^{92}$Nb, ${}^{98}$Tc, ${}^{138}$La, and ${}^{180}$Ta. Near to the neutrino-sphere, the neutrino density is $\sim {10}^{32}{\mathrm{c}\mathrm{m}}^{-3}$. This number density is sufficiently large that the neutrino self-interaction becomes important. The interaction effect on the neutrino flux is calculated by solving the evolution equation for the neutrino density matrix with a collision term estimated in the mean field approximation. We discuss how the neutrino self-interaction and the MSW effect influence the nuclear production by using the modified neutrino spectra along with neutrino-nucleus interactions calculated in the Quasiparticle Random Phase Approximation (QRPA). Our results show that abundances of all nuclides considered in this work are increased by the neutrino self-interaction.