NeutronUncharged elementary particle with a mass of 1.67492716 ·10... emitted immediately during nuclear fissionFission of an atomic nucleus into two parts of the same size... (within about 10-14 s); in contrast to delayed neutrons which are sent out seconds to minutes after the fissionSee 'nuclear fission'. of fission productsNuclides generated by fission or subsequent radioactive deca.... Prompt neutrons make up more than 99% of the neutrons.
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