What essential particles are forced together when the collapsing core material slams into the ultra-dense center, initiating the heavy element creation phase?

Answer

Protons and electrons

During the core slam, immense pressure forces protons and electrons together, resulting in the creation of a flood of neutrons and neutrinos, which are essential for the subsequent r-process.

What essential particles are forced together when the collapsing core material slams into the ultra-dense center, initiating the heavy element creation phase?
ElementstarsupernovaexplosionFusion