What specific process synthesizes approximately half of all elements heavier than iron, such as gold and uranium?

Answer

The rapid neutron-capture process (r-process)

The intense neutron flux characteristic of the supernova shockwave allows nuclei to rapidly absorb neutrons, building up masses far greater than iron through the r-process.

What specific process synthesizes approximately half of all elements heavier than iron, such as gold and uranium?
Elementstarsynthesissuper giant