What mechanism is required to synthesize the heaviest naturally occurring elements beyond iron, often requiring an extremely high flux of neutrons in milliseconds?

Answer

The r-process (rapid neutron capture)

The r-process requires an extraordinarily high flux of neutrons occurring in milliseconds, typically found during core-collapse supernovae or neutron star mergers, to synthesize the heaviest elements.

What mechanism is required to synthesize the heaviest naturally occurring elements beyond iron, often requiring an extremely high flux of neutrons in milliseconds?
Elementstarformationnucleosynthesisastrophysic