nuclear reaction(n = noun.process) - (physics) a process that alters the energy or structure or composition of atomic nuclei;
is a kind of action, activity, natural action, natural process
has particulars: chain reaction, decay, disintegration, radioactive decay, endoergic reaction, exoergic reaction, fission, nuclear fission, fusion, nuclear fusion, nuclear fusion reaction, spallation

   A process that alters the energy or structure or composition of an atomic nucleus. [WordNet 1.5]

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