Abstract
The neutron population in a nuclear reactor is a function of time, position, direction of motion, and energy. Neutrons appear at some position in the reactor as a result of a fission reaction between uranium or plutonium and a neutron from a previous generation. The neutron emerges from the fission reaction with a large kinetic energy (an energy of around 3MeV (or a speed of around 3×109 cm/s). These neutrons undergo elastic and inelastic scattering events with materials in the reactor core (fuel, structure, cladding, coolant, moderator, etc.) and, as a result, lose energy.
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