fast neutron

World English Dictionary
fast neutron
 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

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
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.
The American Heritage® Science Dictionary
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