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
As expected this combination enhanced the fast neutron
spectrum component as well as the neutron flux within the irradiation space.
However, the small fast neutron
cross section with carbon resulted in a minute contribution to the overall observed response .
The topic of the present work is the use the [sup.19]F(n,[alpha])[sup.16]N reaction  to detect fast neutrons
with energies [E.sub.n] > 3 MeV.
Table 1 tabulated available measuring energy with different ranges for different authors [21-31] with corresponding cross section and their errors are recorded in EXFOR library for fast neutron
collected for Zr(A=90 and 96) target elements for (n,2n) reaction.
Power units with fast neutron
reactors, or simply fast reactors, can significantly expand the fuel base of nuclear energy and minimize nuclear waste due to a closed nuclear fuel cycle.
The macroscopic fast neutron
removal cross section of the borate glasses is given in the Table 5.
Thorium-based fuels could generate power in heavy-water reactors, high-temperature gas-cooled reactors, boiling and pressurised light-water reactors, and fast neutron
The fast neutron
therapy programme for patients in South Africa should come to an end.
An experimental fast neutron
reactor in China has begun generating electricity that enters the grid, according to Xinhua, the country's official news agency.
In the typical reactor, fast neutron
are slowed down by moderators to increase the probability of collision between these slow neutrons and the fissile 235U nucleus, and thus increase the amount of energy generated by fission.
If D or T molecules are combined chemically with one oxygen atom we get heavy water which is used as stopper of fast neutron
in fission reactors, so that fissionable uranium ( ) can be broken by the stopped neutrons usually known as slow neutrons.