Cosmic ray muon: cloud chamber image

Cosmic ray muon: cloud chamber image

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This image is part of the feature Centenery Of The Electron


Caption: False-colour cloud chamber photograph showing a cosmic ray muon (green) knocking out an atomic electron (red). The high-energy muon enters from above & hits the electron out of its orbit in an atom of the mixed oxygen & carbon gas filling the cloud chamber. The relatively low-energy electron curves tightly in the chamber's magnetic field. Muons belong to the family of elementary particles called leptons; they are heavy, penetrating versions of the electron which are formed in abundance when primary cosmic rays from outer space collide with particles in the upper atmosphere.

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Keywords: cloud chamber image, coloured, cosmic ray particle, electron, lepton, muon, odyssey, particle physics, photo, subatomic track, tracks

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