Neutrons, thermal

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Neutrons in thermal equilibrium with the ambient medium. Thermal neutrons most probably have a neutron velocity of 2200 m/s at 293.6 K corresponding to an energy of 0.0253 eV. Fast neutrons as generated during nuclear fission are decelerated by collisions with the atoms of the moderator material (usually water, heavy water or graphite) to thermal energy, they are 'thermalized'.

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