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English definition of “beta particle”

beta particle

noun [C] /ˈbeɪ·t̬ə ˌpɑr·t̬ɪ·kəl/
beta (+) particle (also beta (–) particle) chemistry, physics an extremely small piece of matter with a positive or negative electric charge, produced when an atom is broken down. A beta (+) particle is the same as a positron; a beta (–) particle is an electron.
(Definition of beta particle from the Cambridge Academic Content Dictionary © Cambridge University Press)
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