What mechanism is responsible for re-energizing the stalled initial shockwave during a Type II supernova?

Answer

Enormous numbers of neutrinos depositing energy into the shocked material.

While the initial rebound generates a powerful outward shockwave, this wave often stalls as it propagates outward through the dense, infalling material that still surrounds the core. For the visible supernova explosion to occur, this stalled shock must regain momentum and energy. This essential re-energizing process is driven by the vast flood of neutrinos created during the core's compression into a neutron star. These neutrinos stream outward and deposit significant amounts of energy into the shocked material lying just ahead of the stall point, effectively driving the shockwave outward again and launching the spectacular visible explosion.

What mechanism is responsible for re-energizing the stalled initial shockwave during a Type II supernova?

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The Evolution of Red Supergiants to Supernovae - YouTube

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