fast neutron

noun

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

Nearby words

  1. fast food,
  2. fast forward,
  3. fast ice,
  4. fast lane,
  5. fast motion,
  6. fast of gedaliah,
  7. fast one,
  8. fast reactor,
  9. fast rhythm,
  10. fast smear

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


Science 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.
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