3M⊙AGB星中^(26)Al核合成的网络计算和反应率灵敏度分析  

The Network Calculation of Al Nucleosynthesis in 3M AGB Stars and the Sensitivity Analysis of Nuclear Reaction Rates

作　　者：高日梅 童雅阁 吴开谡[1] GAO Rimei;TONG Yage;WU Kaisu(School of Mathematics and Physics,Beijing University of Chemical Technology,Beijing 100029,China)

机构地区：[1]北京化工大学数理学院,北京100029

出　　处：《原子核物理评论》2021年第1期1-7,共7页Nuclear Physics Review

基　　金：北京化工大学优秀课程项目(00810220)。

摘　　要：研究了3 M☉AGB星中^(26)Al核合成的网络计算和核反应率的灵敏度分析。结合最新的核反应率数据,建立了一个从碳到硅完整的核反应网络,计算了^(26)Al的丰度。结果表明,^(26)Al首先在AGB星中有效合成,随着核反应的进行,然后被一系列的核反应消耗。MgAl循环出现在^(26)Al的网络中。我们将核反应网络中的主要核反应分为三类:(n,γ),(p,γ)和(α,γ),并对核反应率的灵敏度进行了详细的分析。已经确定了每一类中最有影响的核反应,它们是25Mg(n,γ)26Mg,25Mg(p,γ)^(26)Al,26Mg(p,γ)27Al,21Ne(p,γ)22Na,18O(α,γ)22Ne和22Ne(α,γ)26Mg。在目前网络所涉及的所有核反应中,25Mg(p,γ)^(26)Al是对^(26)Al的产量有最大的影响,它值得核实验物理学家的关注。The network calculation of^(26)Al nucleosynthesis in 3 M☉AGB stars and the sensitivity analysis of nuclear reaction rates have been investigated in this article.After establishing a complete nuclear reaction network from carbon to silicon,combined with the latest nuclear reaction rate data,we have calculated the abundance of 26Al.The results show that 26Al is effectively synthesized in the AGB stars at the beginning,but as the reaction proceeding,^(26)Al is consumed by a series of nuclear reactions.The MgAl cycle appears in the network of 26Al.We divide the main nuclear reactions in the reaction network into three categories(n,γ),(p,γ)and(α,γ),and the sensitivity of nuclear reaction rates has been analyzed in detail.We have identified the most influential reactions in each type of nuclear reactions,they are:25Mg(n,γ)26Mg,25Mg(p,γ)26Al,26Mg(p,γ)27Al,21Ne(p,γ)22Na,18O(α,γ)22Ne and 22Ne(α,γ)26Mg.Among all the nuclear reactions involved in the present network,25Mg(p,γ)^(26)Al is the one that has the greatest impact on the yield of^(26)Al,which deserves the attention of nuclear experimentalists.

关 键 词：^(26)Al丰度 AGB星 核反应网络 灵敏度分析 

分 类 号：O571.53[理学—粒子物理与原子核物理]