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fast neutron

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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

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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.

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Scientific 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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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