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

fast neutron

1. A neutron that is not in thermal equilibrium with the surrounding medium, especially one produced by fission.
2. Compare slow neutronSee also fast-breeder reactor

Example Sentences

The money also won’t go to the development of a reactor called the Versatile Fast Neutron Source, which DOE has already begun preparing to build at INL and which will serve as a facility for materials science research.

From Science Magazine

One is to build a new generation of advanced fast neutron reactors, which would use the high-level waste as fuel.

From The Guardian

The VTR—also known as the Versatile Fast Neutron Source—would be the first reactor DOE has built since the 1970s.

From Science Magazine

The budget also includes $65 million for research and development of a controversial reactor, sometimes called the Versatile Fast Neutron Source or the Versatile Fast Test Reactor, to be built at Idaho National Laboratory in Idaho Falls.

From Science Magazine

It can also be formed from fast neutron capture in supernovas.

From BBC