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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.
Whereas the thermal energy spectrum can be described simply by the neutron flux and the corresponding cross-sections for absorption, describing the absorption of epithermal neutrons is more complex as a result of the presence of resonances.ey nuclear data for the nuclides 232 Th, 233 U, 235 U, 238 U, 239 Pu and 241 Pu is provided in the table below. To complement the table, a brief description of practice for defining and quantifying thermal and epithermal neutron fluxes is first given.