标题： 反应速率加权多层核反应网络 显示英文标题

标题： Reaction rate weighted multilayer nuclear reaction network

摘要： 核反应速率（$\lambda$）是核合成过程中的一个重要因素。 一个多层次定向加权核反应网络首次被构建，其中反应速率作为权重，中子、质子、$^4$氦以及剩余核素作为不同反应层的标准，该网络基于JINA REACLIB数据库中的所有热核反应。 我们的结果表明，随着恒星温度（$T_{9}$）的增加，$R$-层网络上的核反应速率分布表现出从单峰分布到双峰分布的转变。 核在$R$层的$\lambda = [1,2.5\times10^{1}]$区域的出度分布比$\lambda = [10^{11},10^{13}]$区域的更复杂，而在$T_{9} = 1$处涉及的核的数量与$T_{9} = 3$处的数量有很大不同。 冗余核在$\lambda = [1, 2.5\times10^{1}]$区域的$T_{9} = 3$优先于$(\gamma,p)$和$({\gamma,\alpha})$反应，而不是在$T_{9}=1$的反应，这些反应产生围绕$\beta$稳定线的核。 这项工作为在恒星温度下的核反应网络大数据分析提供了一种新方法。 显示英文摘要

摘要： Nuclear reaction rate ($\lambda$) is a significant factor in the process of nucleosynthesis. A multi-layer directed-weighted nuclear reaction network in which the reaction rate as the weight, and neutron, proton, $^4$He and the remainder nuclei as the criterion for different reaction-layers is for the first time built based on all thermonuclear reactions in the JINA REACLIB database. Our results show that with the increase of the stellar temperature ($T_{9}$), the distribution of nuclear reaction rates on the $R$-layer network demonstrates a transition from unimodal to bimodal distributions. Nuclei on the $R$-layer in the region of $\lambda = [1,2.5\times10^{1}]$ have a more complicated out-going degree distribution than the one in the region of $\lambda = [10^{11},10^{13}]$, and the number of involved nuclei at $T_{9} = 1$ is very different from the one at $T_{9} = 3$. The redundant nuclei in the region of $\lambda = [1, 2.5\times10^{1}]$ at $T_{9} = 3$ prefer $(\gamma,p)$ and $({\gamma,\alpha})$ reactions to the ones at $T_{9}=1$, which produce nuclei around the $\beta$ stable line. This work offers a novel way to the big-data analysis on nuclear reaction network at stellar temperatures.