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muon
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muon

Elementary particle similar to the electron except for its mass which is 207 times greater than that of the electron. It has a half-life of 2 millionths of a second, decaying into electrons and neutrinos. The muon was originally thought to be a meson but is now classified as a lepton. See also tau.
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Glaser, while developing the bubble chamber for detecting subatomic particles at the University of Michigan back in the 1950s, used to sit for hors in the student union staring into a glass of beer, looking for tracks of bubbles left by mu mesons -- energetic particles created in violent encounters between cosmic rays and particles in the atmosphere.
Particle beams, bubbles and beer by Science News
traveled 437 micrometers and then decayed into a neutral charm particle and a negative mu meson.
Aging and decay of beauty by Science News
 
 
 
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