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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.
A fast neutron will have an energy of around 1MeV. This equates to about 14 000 km/sec. The Deuterium - Tritium fusion produces fast neutrons of ~14MeV, - about 52 000 km/sec.â¦ This is fast enough to fission uranium 238. A thermal neutron has an energy of ~0.025eV, equivalent to a velocity of about 2.2 km/sec.