Which energetic events are considered the primary sites for the synthesis of the heaviest elements via the r-process?

Answer

Supernova explosions or the merger of two neutron stars

The r-process occurs during the violent death throes of massive stars, such as during the rebound shockwave from a core-collapse supernova, or, according to recent evidence, during the collision of two neutron stars (a kilonova).

Which energetic events are considered the primary sites for the synthesis of the heaviest elements via the r-process?
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