What process generates elements heavier than iron, such as gold and uranium?

Answer

Rapid neutron capture (r-process) during a core-collapse supernova

Elements heavier than iron require an intense, immediate influx of energy and neutrons, conditions only met during the catastrophic rebound shockwave of a Type II supernova explosion.

What process generates elements heavier than iron, such as gold and uranium?
starsastrophysicsElementsnucleosynthesis