What process provides the necessary energy to re-energize the stalled shockwave near the nascent neutron star?

Answer

Neutrino-driven heating (shock revival)

Neutrinos streaming outward deposit energy into the dense material just behind the stalled shock front, providing a crucial boost known as shock revival that drives the explosion forward.

What process provides the necessary energy to re-energize the stalled shockwave near the nascent neutron star?
astronomystarsupernovatriggercore collapse