In which stellar environments does the slow neutron capture process (s-process) primarily create elements like barium and strontium?

Answer

Aging, lower-mass stars like asymptotic giant branch (AGB) stars

The s-process occurs in less violent environments than supernovae, typically in aging AGB stars where the flux of free neutrons is lower, allowing nuclei more time to capture neutrons slowly over thousands of years.

In which stellar environments does the slow neutron capture process (s-process) primarily create elements like barium and strontium?
Elementastronomystarmassnucleosynthesis