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The neutron detection temperature, also called the neutron energy, indicates a free neutron 's kinetic energy, usually given in electron volts. The term temperature is used, since hot, thermal and cold neutrons are moderated in a medium with a certain temperature.pithermal neutrons have energies between 1 eV and 10 keV and smaller nuclear cross sections than thermal neutrons.
They have a distribution of speeds similar to that of the molecules of a gas at the temperature of the moderator. Data concerning nuclear interactions are often given for standard thermal neutrons of speed 2200 metres per second, which is approximately the most probable speed at normal laboratory temperatures.