Fermi National Laboratory

Operation Terminology

Muon

The muon is an unstable subatomic particle with a mean lifetime of 2.2 Ás. This comparatively long decay lifetime (the second longest known) is due to being mediated by the weak interaction. A muon is a heavier copy of the electron. Muons were discovered by Carl D. Anderson and Seth Neddermeyer at Caltech in 1936, while studying cosmic radiation.

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