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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.
2a : of, relating to, or caused by heat thermal stress thermal insulationb : being or involving a state of matter dependent upon temperature thermal conductivity thermal agitation of molecular structurec : having low energies of the order of those due to thermal agitation thermal neutrons.