fast neutron

American  

[fast noo-trahn] / ˈfæst ˈnu trɑn /

noun

1. Physics. a neutron whose kinetic energy is high relative to surrounding neutrons, especially one that was produced by nuclear fission and has not been slowed down by a neutron moderator. Compare slow neutron.

---

fast neutron British  

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

---

fast neutron Scientific  

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

2. Compare slow neutron See also fast-breeder reactor

---

Example Sentences

Salehi did graduate work on fast neutron reactors at MIT.

From Washington Post • Apr. 27, 2015

Power generated by the $40.5 million, 100,000-kw., "fast neutron breeder plant" will be distributed by Detroit Edison Co.

From Time Magazine Archive