What event is now theorized to be a major factory for creating vast amounts of the heaviest, neutron-rich elements?

Answer

The collision of two neutron stars

Recent observations suggest that the collision of two neutron stars is a prodigious factory, creating massive amounts of the heaviest elements due to the unimaginable violence and high neutron density involved.

What event is now theorized to be a major factory for creating vast amounts of the heaviest, neutron-rich elements?
Elementastronomycompositionstargiant