fast neutron

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Related to Neutron temperature: Electron temperature, thermal neutron

fast neutron

n
(General Physics) physics
a. a neutron produced by nuclear fission that has lost little energy by collision; a neutron with a kinetic energy in excess of 0.1 MeV
b. a neutron with a kinetic energy in excess of 1.5 MeV, the fission threshold of uranium-238