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fast neutron
noun
- physics
- 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
- a neutron with a kinetic energy in excess of 1.5 MeV, the fission threshold of uranium-238
fast neutron
- A neutron that is not in thermal equilibrium with the surrounding medium, especially one produced by fission.
- Compare slow neutronSee also fast-breeder reactor
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