Nuclear Fission :-
Nuclear Fission is a reaction wherein a heavy nucleus is bombarded by neutrons and thus become unstable, which causes decompose or split into two nuclei with equivalent size and magnitude, with a great detachment of energy and the emission of two or three neutrons.
Example :- Isotope тВЙтВВU┬▓┬│тБ╡ bombarded with a neutron breaks into two intermediate mass nuclear fragments.
тВЙтВВU┬▓┬│тБ╡ + тВАn┬╣ тЖТ тВЙтВВU┬▓┬│тБ╢ тЖТ тВЕтВЖBa┬╣тБ┤тБ┤ + тВГтВЖKrтБ╕тБ╣ + 3 тВАn┬╣
Another example :-
тВАn┬╣ + тВЙтВВU┬▓┬│тБ╡ тЖТтВЙтВВU┬▓┬│тБ╢ тЖТ тВЕтВБSb┬╣┬│┬│ + тВДтВБNbтБ╣тБ╣ + 4 тВАn┬╣
or
тВАn┬╣ + тВЙтВВU┬▓┬│тБ╡ тЖТ тВЕтВДXe┬╣тБ┤тБ░ + тВГтВИSrтБ╣тБ┤ + 2 тВАn┬╣
- The fragment products are radioactive nuclei. They emit particles in succession to achieve stable end product.
- The energy released in the fission reaction of nuclei like Uranium is of the order of 200 MeV per fissioning nucleus.
Let us
a nucleus with A = 240 breaking into two fragments each of A = 120
Then
Energy for A = 240 nucleus is about 7┬╖6 MeV
Energy for two A = 120 fragments nuclei is about 8┬╖5 MeV
Gaining in binding energy per nucleon is about 0.9 MeV
Here the total gaining binding energy = 240 ├Ч 0.9 = 216 MeV
- The source of energy in nuclear reactors, which produce electricity, is nuclear fission.
- The enormous energy released in an atom bomb comes from uncontrolled nuclear fission.
