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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.
Contrary to heat transfer by radiation, there is no thermal conduction in vacuum. The basic law of thermal conduction is the Fourier law which states that the heat flux density is proportional to the temperature gradient T in an isotropic body: =âÎ» grad T. The constant of proportionally Î» is the thermal conductivity.he coefficients of thermal conductivity Î» ik of anisotropic body form a tensor in the 2nd dimension. For crystals, it is found, within the measurement error, that thermal conductivity in mutually opposite directions is the same.