Neutrino-Nucleus Reaction Cross Sections for Light Element Synthesis in Supernova Explosions

• Published in: The Astrophysical journal Vol. 686; no. 1; pp. 448 - 466
• Main Authors: Yoshida, Takashi, Suzuki, Toshio, Chiba, Satoshi, Kajino, Toshitaka, Yokomakura, Hidekazu, Kimura, Keiichi, Takamura, Akira, Hartmann, Dieter H
• Format: Journal Article
• Language: English
• Published: Chicago, IL IOP Publishing 10-10-2008; University of Chicago Press
• Subjects: Astronomy; Earth, ocean, space; Exact sciences and technology; Neutrino-nucleus reactions; nuclear reactions, nucleosynthesis, abundances; Supernovae explosion; Light element; Neutrinos; Nucleosynthesis; Elementary particles; Abundance; Massless particles; Cross sections; supemovae: general
• ISSN: 0004-637X; 1538-4357
• DOI: 10.1086/591266

The neutrino-nucleus reaction cross sections of super(4)He and super(12)C are evaluated using new shell model Hamiltonians. Branching ratios of various decay channels are calculated to evaluate the yields of Li, Be, and B produced through the v-process in supernova explosions. The new cross sections enhance the yields of super(7)Li and super(11 )B produced during the supernova explosion of a 16.2 M sub([image]) star model compared to the case using the conventional cross sections by about 10%. On the other hand, the yield of super(10)B decreases by a factor of 2. The yields of super(6)Li, super(9)Be, and the radioactive nucleus super(10)Be are found at a level of [image]10 super(-11) M sub([image]). The temperature of [image] - and [image] - neutrinos inferred from the supernova contribution of super( 11)B in Galactic chemical evolution models is constrained to the 4.3-6.5 MeV range. The increase in the super(7)Li and super(11)B yields due to neutrino oscillations is demonstrated with the new cross sections.