muon
muon (symbol μ−) Negatively charged elementary particle, originally thought to be a meson but now classified as a lepton. It has spin 1/2, a mass c.207 times that of the electron, and decays weakly into an electron, a neutrino, and an antineutrino. See also antimatter
muon
mu·on / ˈmyoōˌän/ • n. Physics an unstable subatomic particle of the same class as an electron (a lepton), but with a mass around 200 times greater. Muons make up much of the cosmic radiation reaching the earth's surface.DERIVATIVES: mu·on·ic / myoōˈänik/ adj.
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