出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：Recent neutrino experiment confirmed that neutrinos have finite masses and that neutrino oscillations
occur. Supernova neutrinos also change their flavors propagating in the stellar material
surrounding a proto-neutron star and, accordingly, change their spectral energy distributions. The
nucleosynthesis of light elements such as 7Li and 11B is significantly enhanced through the n -
process in supernova explosions. Yields depend on the energy spectra of the neutrinos emitted
from the proto-neutron star, so that neutrino oscillations could be crucial for the estimated yields
of 7Li, 11B, and other isotopes produced in supernovae. We evaluate the 7Li and 11B yields in
supernovae taking into account changes of the neutrino energy spectra due to flavor oscillations
assuming large mixing angle solutions. We investigate their dependence on key parameters, such
as mass hierarchies and the mixing angle q13. In the case of a normal mass hierarchy and an
adiabatic resonance of 13-mixing, the 7Li yield is larger than that without neutrino oscillations
by a factor of » 2. For other parameter cases and for the 11B yield in general, the enhancement
is smaller. The increase of the 7Li/11B ratio is demonstrated for a normal mass hierarchy and
a relatively large sin2 2q13, where 13-mixing resonance is adiabatic and sin2 2q13 < 0:1. Thus,
the detection of 7Li/11B enhancements in stars showing signs of supernova enrichment suggest a
normal mass hierarchy and relatively large value of sin2 2q13.
