AI 中文总结
本文汇编综述318篇文献中371项BBN主、次反应的实验数据，分析S因子特征差异并拟合，为核合成计算提供可靠S因子。
AI 中文摘要
天体物理S因子在将实验室截面数据外推到核合成计算相关的更低能量时发挥重要作用。无论是对S因子的经验拟合还是理论建模，一定能量范围内的截面实验信息都是获得可靠S因子以及进入核合成网络的核反应率的关键。鉴于文献和数据库中同一反应的零散且有时存在差异的数据，我们汇编并综述了来自318篇参考文献的可用数据，这些数据涉及大爆炸核合成（BBN）中的主反应和次反应的371项实验。研究发现，某些能量处的峰以及低能区因屏蔽效应导致的S因子急剧上升等显著特征在不同实验中存在差异。后者取决于靶材的变化，有时还取决于提取同一核反应信息时的温度。例如，有45个低能区S因子可能呈现电子屏蔽效应的案例显示出与背景值的偏差，这些偏差具有每个实验、靶材和温度所特有的特征。在完成了该汇编、讨论了每个反应在BBN中的相关性以及S因子的特征后，我们对部分选定的受关注反应的S因子进行了经验拟合。本论文是以下工作的预印本：Carlos A. Salas和Neelima G. Kelkar所著《Astrophysical S-Factors in Primordial Nucleosynthesis》，2026年，SpringerBriefs in Physics。它是作者手稿在被接受出版前的版本，尚未经过出版方（如适用）的编辑和/或同行评审。最终认证版本可在线获取：this https URL
英文摘要
The astrophysical $S$-factor plays an important role in extrapolating the laboratory cross section data to lower energies of relevance in nucleosynthesis calculations. Be it empirical fits or theoretical modeling of the $S$-factors, experimental information on the cross sections over a range of energies is essential to provide reliable $S$-factors and thereby the nuclear reaction rates which enter the nucleosynthesis networks. In view of the scattered and sometimes diverse data on the same reaction in literature and the databases, we present a compilation and review of available data from 318 references involving 371 experiments on the leading and sub-leading reactions in big bang nucleosynthesis (BBN). Salient features such as bumps at certain energies and a steep rise in the $S$-factor at low energies due to screening effects are found to vary in different experiments. The latter depends on the variation of targets and sometimes temperature to extract information on the same nuclear reaction. For instance, 45 cases in which the $S$-factor at low-energy could present electron screening-effect showed deviations from background values with features which are unique to each experiment, target and temperature. The extensive compilation, discussions of the relevance of each reaction in BBN and the features of the $S$-factors is followed by a presentation of empirical fits to the $S$-factors in some selected reactions of interest. This is a preprint of the following work: Carlos A. Salas and Neelima G. Kelkar, Astrophysical S-Factors in Primordial Nucleosynthesis, 2026, SpringerBriefs in Physics. It is the version of the author's manuscript prior to acceptance for publication and has not undergone editorial and/or peer review on behalf of the Publisher (where applicable). The final authenticated version is available online at: https://doi.org/10.1007/978-3-032-30466-7
