If light nuclei are forced together, they will fuse with a yield of energy because the mass of the combination will be less than the sum of the masses of the individual nuclei. In nuclear physics, nuclear fusion is a nuclear reaction in which two or more atomic nuclei collide at very high energy and fuse together into a new nucleus, e.g., helium. But not all the total energy can be recovered in a reactor. The total energy released in fission can be calculated from binding energies of the initial target nucleus to be fissioned and binding energies of fission products. In reactor physics, neutron-induced nuclear fission is the process of the greatest practical importance. The decay process is called spontaneous fission, and it is a very rare process. ![]() Nuclear fission is either a nuclear reaction or a radioactive decay process in nuclear physics. The fission process often produces free neutrons and photons (in the form of gamma rays) and releases a large amount of energy. Nuclear fission is a nuclear reaction in which the nucleus of an atom splits into smaller parts (lighter nuclei). Whether the reaction is exothermic or not depends on the binding energy of the resulting nuclei.
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