Sanakirja.org

(nuclear physics, astrophysics) the relatively slow nucleosynthesis process, in giant stars, in which neutron capture synthesizes elements up to atomic mass number 210 (at which point alpha decay becomes a deterrent to further building).

Periodic table showing the cosmogenic origin of each element. The elements heavier than iron with origins in dying low-mass stars are typically those produced by the s-process, which is characterized by slow neutron diffusion and capture over long periods in such stars.