fast neutron

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Related to Fast neutrons: Thermal neutrons, slow neutrons

fast neutron

n
(General Physics) physics
a. 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
b. a neutron with a kinetic energy in excess of 1.5 MeV, the fission threshold of uranium-238
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References in periodicals archive ?
In January 1939, the Austrian-German <<tandem>> of physicists Otto Frisch and Lisa Meitner, interpreting the results of a nuclear experiment conducted in December 1938 by German scientists Otto Hahn and Fritz Strassmann, concluded that in the natural uranium [sub.92][sup.238]U the nuclear reaction of dividing the <<mother>> nuclei of its[sub.92][sup.238]U isotope into two fragments with their <<daughter>> nuclei and the emission of several fast neutrons [3, 10].
These materials are characterized by high thermal neutron absorption cross sections and are almost transparent to fast neutrons. In principle the material selection depends on the specific reactor irradiation conditions and on the targeted neutron spectrum.
Giacomelli et al., "Response of a single-crystal diamond detector to fast neutrons," Journal of Instrumentation, vol.
The neutrons produced directly from the [sup.239]Pu-Be source are fast neutrons with energies contained in the range of 1-11 MeV.
Likhachov explained that nuclear wastes are dangerous; however, he said that his company has an innovative system to reuse the fuel depleted in some types of power plants using fast neutrons which do the recycling of the fuel.
The topic of the present work is the use the [sup.19]F(n,[alpha])[sup.16]N reaction [7] to detect fast neutrons with energies [E.sub.n] > 3 MeV.
The moderator can be switched out and fast neutron emitted, giving the hybrid generator the capability of emitting either thermal of fast neutrons.
Washington, July 10 ( ANI ): NASA's MESSENGER spacecraft has discovered part of the outer layer of the Sun that is sending out modestly energetic subatomic particles called fast neutrons, which flowed past Mercury into space.
It was shown in [1] that background from fast neutrons of the reactor by adequate shielding is lower than from neutrons generated by cosmic rays.
Fast neutrons primarily cause cluster defects and are the dominant radiation-induced damage mechanism in phototransistor.
In this reactor, which is based on fast neutrons, more fissile material is produced through the conversion of 238U into 239Pu than is consumed through fission.