The "s-process," or slow neutron capture process, is a series of nuclear reactions that occur in stars, particularly during their later stages of evolution. In this process, atomic nuclei capture neutrons slowly, allowing them to undergo beta decay, which transforms them into heavier elements. This mechanism primarily contributes to the formation of elements like barium, lead, and strontium. The s-process typically takes place in asymptotic giant branch (AGB) stars, where conditions allow for the slow capture of neutrons. As these stars evolve, they produce a variety of heavy elements that are eventually released into space when the stars shed their outer layers. This enriches the interstellar medium, contributing to the chemical evolution of the universe.