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(nuclear physics) A nuclear reaction in which a large nucleus splits into smaller ones, sometimes accompanied by the simultaneous release of energy.

Induced fission reaction. A neutron is absorbed by a uranium-235 nucleus, turning it briefly into an excited uranium-236 nucleus, with the excitation energy provided by the kinetic energy of the neutron plus the forces that bind the neutron. The uranium-236, in turn, splits into fast-moving lighter elements (fission products) and releases several free neutrons, one or more "prompt gamma rays" (not shown) and a (proportionally) large amount of kinetic energy.

(nuclear physics) A nuclear reaction in which a large nucleus splits into smaller ones, sometimes accompanied by the simultaneous release of energy.

The "curve of binding energy": A graph of binding energy per nucleon of common isotopes.