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
Words nearby fast neutron
fast food,
fast forward,
fast ice,
fast lane,
fast motion,
fast neutron,
fast of gedaliah,
fast one,
fast reactor,
fast rhythm,
fast smear
Scientific definitions for fast neutron
fast neutron
A neutron that is not in thermal equilibrium with the surrounding medium, especially one produced by fission. Compare slow neutron. See also fast-breeder reactor.