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alpha particle

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Noun

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alpha particle (plural alpha particles)

  1. (physics) A doubly positively charged nucleus of a helium-4 atom (consisting of two protons and two neutrons), emitted as a consequence of radioactivity.
    Alternative form: α-particle
    Hypernyms: helion (broad sense, uncommonly) < ion < particle
    Holonyms: alpha ray, alpha radiation
    Coordinate terms: helion (usual sense, helium-3 ion); beta particle

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