What must occur for the shockwave generated at the core rebound to create a visible supernova explosion?

Answer

The shockwave must be successfully re-energized as it moves outward

When the rapidly infalling outer layers impact the stiff, unyielding neutron core, a powerful initial shockwave is generated, ripping outward. However, passing this shockwave through the remaining dense layers of the star—the material that hasn't yet fallen in—is extremely difficult, and the shockwave often loses energy and stalls. For the star to completely tear itself apart in the spectacular fashion recognized as a core-collapse supernova, this outward-moving shockwave must somehow gain fresh energy as it propagates through the stellar envelope. Successful re-energization is the crucial physical event that ensures the shockwave travels all the way to the surface.

What must occur for the shockwave generated at the core rebound to create a visible supernova explosion?

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