During which catastrophic event does the rapid neutron capture process (r-process) primarily occur?

Answer

Core collapse into a supernova or neutron star merger

The r-process requires an extremely high neutron density, which is only found during the violent events of a massive star's core collapse into a supernova or the merger of two neutron stars.

During which catastrophic event does the rapid neutron capture process (r-process) primarily occur?
ElementastronomystarFusionnucleosynthesis