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British Dictionary definitions for fast neutron

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 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

fast neutron in Science

fast neutron

  1. 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.
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