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Cluster decay

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Cluster decay, also known as heavy particle radioactivity, is a rare type of radioactive decay in which an unstable atomic nucleus emits a small cluster of protons and neutrons, that is to say an atomic nucleus. The emitted nucleus (cluster) is larger than an alpha particle (a 42He nucleus) which has two protons and two neutrons), but is smaller than the typical fragments produced in spontaneous fission. In a nuclear fission process, the masses of the two nuclei that emerge are usually relatively close to one another.