天体物理条件下$sd$壳层核弱相互作用的中微子谱
Neutrino Spectra from Nuclear Weak Interactions in $sd$-Shell Nuclei Under Astrophysical Conditions
摘要：
本文用壳模型计算了70个$sd$壳核在质量数范围$A=21-35$内的核中微子能谱.我们的计算包括核激发态，适合于坍缩前大质量恒星的高温和致密条件。我们认为中微子产生的带电轻子捕获和衰变，并首次以表格形式，中性电流核去激发，提供中微子能谱的富勒-福勒-纽曼温度密度网格上的这些相互作用通道为每个核。我们使用完整的$sd$壳模型空间来计算初始核状态高达20 MeV的激发与过渡到最终状态高达35-40 MeV，采用修改的Brink-Axel假设来处理高温人口因素和核配分函数。
英文摘要：
We present shell model calculations of nuclear neutrino energy spectra for 70 $sd$-shell nuclei over the mass number range $A=21-35$. Our calculations include nuclear excited states as appropriate for the hot and dense conditions characteristic of pre-collapse massive stars. We consider neutrinos produced by charged lepton captures and decays and, for the first time in tabular form, neutral current nuclear deexcitation, providing neutrino energy spectra on the Fuller-Fowler-Newman temperature-density grid for these interaction channels for each nucleus. We use the full $sd$-shell model space to compute initial nuclear states up to 20 MeV excitation with transitions to final states up to 35-40 MeV, employing a modification of the Brink-Axel hypothesis to handle high temperature population factors and the nuclear partition functions.
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