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Noun
1. alpha decayPhysics
Wikipedia definition
2. Alpha decayAlpha decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle (two protons and two neutrons) and thereby transforms (or 'decays') into an atom with a mass number 4 less and atomic number 2 less. For example: 23892U → 23490Th + 42He which can also be written as: 238U → 234Th + α, since an alpha particle is the same as a helium-4 nucleus, which has mass number 4 and atomic number 2.
Read “Alpha decay” on English Wikipedia
Read “アルファ崩壊” on Japanese Wikipedia
Read “Alpha decay” on DBpedia
Other forms
アルファ崩壊 【アルファほうかい】

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