The s Process and Beyond

doi:10.1146/annurev-nucl-102422-080857

The s Process and Beyond

2023-09-25

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DOI：10.1146/annurev-nucl-102422-080857

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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 beta 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.

Keywords:

nuclear reactions

neutron captures

AGB stars

massive stars

stellar spectroscopy

meteoritic anomalies

The s Process and Beyond

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