Abstract
During fission an atomic nucleus generally splits into two fission products and between two and three neutrons. These neutrons are extremely energetic having energies in the low MeV range. These neutrons lose energy through scattering collisions, and if they are not captured by a nucleus will eventually reach thermal equilibrium at energies of a fraction of an eV. It is found that light nuclei such as hydrogen and beryllium are the most effective at slowing-down neutrons. During this slowing-down process, the neutron population will take on a spectrum of energies which will depend upon other things, the amount of fissionable material, the probability of the neutrons being scattered as opposed to being absorbed, and so on.
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