A radioactive atom emits a cluster of neutrons and protons-235 heavier than an alpha particle in a process known as cluster decay.
Cluster decay, also known as heavy particle radioactivity or heavy ion radioactivity, is a very uncommon form of nuclear decay in which an atomic nucleus generates a small "cluster" of neutrons and protons, more than in an alpha particle but less than a typical binary fission fragment. The cluster size is also produced by ternary fission into three fragments. When the parent nucleus loses protons, it becomes the daughter nucleus, which has an atomic number Zd = Z + Ze and a mass number Ad = A Ae, where Ae = Ne + Ze. [1] For instance
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