Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-07-17
Astronomy and Astrophysics
Astrophysics
19 pages, 30 figures, accepted for publication in Astrophysical Journal. Typos are corrected
Scientific paper
10.1086/591266
The neutrino-nucleus reaction cross sections of 4He and 12C 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 nu-process in supernova explosions. The new cross sections enhance the yields of 7Li and 11B produced during the supernova explosion of a 16.2 M_odot star model compared to the case using the conventional cross sections by about 10%. On the other hand, the yield of 10B decreases by a factor of two. The yields of 6Li, 9Be, and the radioactive nucleus 10Be are found at a level of 10^{-11} M_odot. The temperature of nu_{mu,tau}- and bar{nu}_{mu,tau}-neutrinos inferred from the supernova contribution of 11B in Galactic chemical evolution models is constrained to the 4.3-6.5 MeV range. The increase in the 7Li and 11B yields due to neutrino oscillations is demonstrated with the new cross sections.
Chiba Satoshi
Hartmann Dieter H.
Kajino Taka
Kimura Kenichiro
Suzuki Toshiya
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