Definitions for nuclear reaction
Random House Webster's College Dictionary
Ref: reaction (def. 5b). 7 2
(physics) a process that alters the energy or structure or composition of atomic nuclei
a process such as the fission of an atomic nucleus, or the fusion of one or more atomic nuclei and / or subatomic particles in which the number of protons and / or neutrons in a nucleus changes; the reaction products may contain a different element or a different isotope of the same element
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