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


fast neutron

  1. A neutron that is not in thermal equilibrium with the surrounding medium, especially one produced by fission.


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fastnessFast of Gedaliah