Particle Zoo

The Standard Model

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The Muon

Symbol: μ-
Group: fermion, lepton
Rest mass: < 2 x 10-9 u
Charge: -1 e
Mean lifetime: 2.2 x 10-6 sec
Spin: 1/2
Generation: 2
The muon is a particle very similar to the electron, but much heavier than this and unstable. It even can take the electron's place in atoms, but there only has a very shortened lifetime. Muons mainly occur at the decay of pions. If they come into existence by cosmic radiation in the upper atmosphere, they can pierce deep into Earth's ground during their lifetime. They can be measured pretty good and those particles can be used to scan large objects, like it was already done with pyramids and volcanoes. Muons decay to electrons and to anti- electron neutrinos.



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