Square Kilometre Array
Square Kilometre Array
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DOI：
10.1007/978-3-662-44185-5_5314
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发表时间：
2021-12
期刊：
影响因子：
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通讯作者：
J. Wagg;I. Jiménez-Serra;Tyler Bourke;Robert Braun;Phil Diamond;William Garnier;Jimi Green;
中科院分区：
文献类型：
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作者：
J. Wagg;I. Jiménez-Serra;Tyler Bourke;Robert Braun;Phil Diamond;William Garnier;Jimi Green;
s-过程是形成比铁峰重的核的两个主要核合成过程之一。中子俘获比β衰变慢（因此，s代表慢），使物质的流动保持在核稳定谷。s-过程发生在恒星的氦聚变过程中，中子通过13C（α，n）或22Ne（α，n）释放，时间尺度为104年。后者在大质量恒星的核中发生，产生轻的s核（质量数A <90，如Sr），而前者在AGB星的壳层He燃烧时发生，产生较重的s核（高达208 Pb）。
The s-process is one of the two main nucleosynthesis processes forming nuclei heavier than those of the iron peak. Neutron captures are slower than beta-decays (hence the s, for slow), keeping the flow of matter on the nuclear stability valley. The s-process occurs during helium fusion in stars, neutrons being released through 13C (α, n) or 22Ne (α, n), on timescales of 104 years. The latter reaction operates in the cores of massive stars and produces the light s-nuclei (with mass number A< 90, like Sr), while the former operates during shell He burning in▶ asymptotic giant branch (AGB) stars and produces the heavier s-nuclei (up to 208Pb).