and 9 fainter emissions from 0.645 to 2.090 MeV), yielding stable tellurium-124. Gamma rays from antimony-124 split beryllium-9 into two alpha particles and a neutron with an average kinetic energy of 24 keV (a so-called intermediate neutron in terms of energy):

Other isotopes have higher thresholds for photoneutron production, as high as 18.72 MeV, for carbon-12.

Hypernovae

In explosions of very large stars (250

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