What is the term for a nuclear reaction in which a heavy nucleus splits into two or more lighter nuclei?

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Nuclear fission is the process in which a heavy nucleus such as uranium-235 or plutonium-239 is split into two or more lighter nuclei by bombarding it with neutrons. This reaction releases a large amount of energy and additional neutrons that can go on to initiate other fission reactions, making it useful in nuclear power plants and atomic bombs.

What Is the Term for a Nuclear Reaction in Which