What causes the violent rebound that generates a supernova shockwave in less massive blue giants?

Answer

Infalling outer layers hitting the newly formed, incompressible neutron core

When the core collapses down to nuclear densities, it becomes incredibly rigid. This stiff core causes the infalling outer layers to rebound violently, creating the shockwave that results in a supernova.

What causes the violent rebound that generates a supernova shockwave in less massive blue giants?
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