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fast neutron

noun
1.
(physics)
  1. 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
  2. a neutron with a kinetic energy in excess of 1.5 MeV, the fission threshold of uranium-238
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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fast neutron in Science
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
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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