Jisho

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崩壊
Wikipedia definition
1. Cluster decayCluster decay (also named heavy particle radioactivity or heavy ion radioactivity) is a type of nuclear decay in which a parent atomic nucleus with A nucleons and Z protons emits a cluster of Ne neutrons and Ze protons heavier than an alpha particle but lighter than a typical binary fission fragment (although ternary fission into three fragments produces products which overlap cluster decay).
Read “Cluster decay” on English Wikipedia
Read “クラスタ崩壊” on Japanese Wikipedia
Read “Cluster decay” on DBpedia

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