The “ one or more” is the key parameter of reactor physics. Source: Chain reactionĪ nuclear chain reaction occurs when one single nuclear reaction causes an average of one or more subsequent nuclear reactions, thus leading to the possibility of a self-propagating series of these reactions. The neutron triggers this nuclear reaction. Nuclear fission is a nuclear reaction in which the nucleus of an atom splits into smaller parts (lighter nuclei). Free neutrons released by each fission play a critical role as a trigger of the reaction. This is because these nuclei release neutrons when they break apart, which can induce fission of other nuclei. Some nuclei can undergo fission on their own spontaneously, but only specific nuclei, like uranium-235, uranium-233, and plutonium-239, can sustain a fission chain reaction.
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