Neutron captures produce the vast majority of abundances of elements heavier than iron in the Universe. Beyond the classical slow ( s) and rapid ( r) processes, there is observational evidence for neutron-capture processes that operate at neutron densities in between, at different distances from the valley of β stability. Here, we review the main properties of the s process within the general context of neutron-capture processes and the nuclear physics input required to investigate it. We describe massive stars and asymptotic giant branch stars as the s-process astrophysical sites and discuss the related physical uncertainties. We also present current observational evidence for the s process and beyond, which ranges from stellar spectroscopic observations to laboratory analysis of meteorites.

中文翻译：

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 ThesProcess 及其他


中子捕获产生了宇宙中绝大多数比铁重的元素。除了经典的慢速 （ s） 和快速 （r） 过程之外，还有观测证据表明，中子俘获过程以介于两者之间的中子密度运行，与β稳定谷的距离不同。在这里，我们在中子俘获过程的一般背景下回顾了 s 过程的主要特性以及研究它所需的核物理输入。我们将大质量恒星和渐近巨分支星描述为 s 过程天体物理站点，并讨论了相关的物理不确定性。我们还提供了 s 过程及以后的当前观测证据，范围从恒星光谱观测到陨石的实验室分析。