Beta Decay Definition
noun
Radioactive decay in which a beta particle is emitted by an atomic nucleus.
American Heritage
Radioactive disintegration of a nucleus with the accompanying emission of a beta particle: the residual nucleus has one more unit of positive charge after electron emission and one less after positron emission.
Webster's New World
(physics) A nuclear reaction in which a beta particle (electron or positron) is emitted.
Wiktionary
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