arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 0807.2723astro-phhep-ph
收藏

超新星爆炸中轻元素合成的中子-核反应截面

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

T. Yoshida, T. Suzuki, S. Chiba, T. Kajino, H. Yokomakura, K. Kimura, A. Takamura, D. H. Hartmann

摘要:

用新的壳模型哈密顿量计算了~ 4 He和~(12)C的中微子-核反应截面。计算了各种衰变通道的分支比,以评估超新星爆炸中通过核过程产生的Li、Be和B的产额。新的截面使16.2 M_odot星模型超新星爆炸产生的~ 7 Li和~(11)B产额比传统的截面提高了约10%。另一方面,10 B的产率下降了2倍。测得6Li、9 Be和放射性核10 Be的产额为10^{-11} M_odot。在银河系化学演化模型中,根据超新星11 B的贡献推断的nu_{mu,tau} -和bar{nu}_{mu,tau}-中微子的温度被限制在4.3-6.5 MeV的范围内。用新的截面证明了由于中微子振荡引起的~ 7 Li和~(11)B产额的增加。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑