Neutrino Capture and Supernova Nucleosynthesis
Neutrino Capture and Supernova Nucleosynthesis
复制标题
中微子捕获和超新星核合成
DOI：
10.1086/176442
复制
发表时间：
1995
期刊：
影响因子：
--
通讯作者：
B. Meyer
中科院分区：
文献类型：
--
作者：
G. Fuller;B. Meyer
作者：富勒，总经理；迈耶，BS |摘要：我们研究了核后弹跳超新星环境中原子核上的带电中微子和反中微子捕获。我们指出，这些过程可能在确定中微子加热的超新星喷射物模型中的核合成过程中发挥着重要但迄今为止被忽视的作用。特别是，我们建议纳入这些速率可能有助于解决这些模型中中子数接近 50 的核素过量生产的问题，此外，还可以提高 α 过程中一些轻 p 过程核的产量，特别是 92Mo。研究发现，富中子核上的中微子俘获率主要受费米（等量异位模拟态）和伽莫夫-特勒共振的跃迁支配。在这些情况下，中微子俘获阈值大约只是核母体和核子体之间的核库仑能量差，因此与β衰变率相比，中微子俘获率仅表现出对中子和质子数的较弱依赖性。我们利用这一特性来限制 r 过程区域在后核弹跳超新星环境中的位置。我们对原子核和核子上的电子中微子和反中微子捕获率进行了分析估计。
Author(s): Fuller, GM; Meyer, BS | Abstract: We investigate charged current neutrino and antineutrino capture on nuclei in the post-core bounce supernova environment. We point out that these processes may play an important, and heretofore overlooked, role in determining the nucleosynthesis in models of neutrino-heated supernova ejecta. In particular, we suggest that inclusion of these rates may help solve the problem in these models of overproduction of nuclides with neutron numbers near 50 and, in addition, enhance the production of the some of the light p-process nuclei in the α-process, particularly 92Mo. The neutrino capture rates on neutron-rich nuclei are found to be dominated by transitions to the Fermi (isobaric analog state) and Gamow-Teller resonances. In these cases, the neutrino capture thresholds are approximately just the nuclear Coulomb energy differences between nuclear parents and daughters, and the neutrino capture rates therefore exhibit only weak dependence on neutron and proton numbers compared to that of β--decay rates. We exploit this property to constrain the location of the r-process region in the post-core bounce supernova environment. We present analytic estimates for the rates of electron neutino and antineutrino capture on nuclei and nucleons.