What fraction of the total explosion energy is carried away by neutrinos that stream away unimpeded?

Answer

About 99%

The collapse generates a staggering number of neutrinos, and while a small fraction are captured to drive the explosion, the vast majority stream away unimpeded, carrying off about 99% of the explosion’s total energy.

What fraction of the total explosion energy is carried away by neutrinos that stream away unimpeded?
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