In Physics Nuclear Fission is the process by which the incident neutron enters the heavy target nucleus forming a compound nucleus that is excited to such a high energy level that the nucleus splits into two large fission fragments by either a nuclear reaction or a radioactive decay process. This fission process often leads to the production of free neutrons and gamma photons. Nuclear fission may also occur spontaneously in the case of very heavy nuclei. In order for fission to produce energy, the total binding energy of the resulting elements must be more negative than that of the starting element. The amount of free energy contained in nuclear fuel is millions of times the amount of free energy contained in a similar mass of chemical fuel such as gasoline, making nuclear fission a very dense source of energy. During the nuclear splitting or nuclear fusion, some of the mass of the nucleus gets converted into huge amounts of energy and thus this mass is removed from the total mass of the original particles, and the mass is missing in the resulting nucleus.
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