Recapitulation: decay of cosmic-ray muons
{"Image DocumentName": "Recapitulation: decay of cosmic-ray muons", "Image ImageDescription": "Muon \u2013 an electrically charged unstable elementary particle with a rest energy ~ 207 times greater than the rest energy of an electron. The muon has an average half-life of 2.2 \uf0b410-6 s. Muons are created at high altitudes due to collisions of fast cosmic-ray particles (mostly protons) with atoms in the Earth atmosphere. (Most cosmic rays are generated in our galaxy, primarily in supernova explosions) N0\u2013 the number of muons generated at high altitude. In the muon\u2019s rest frame. By ignoring relativistic effects (wrong!), we get the decay length: ~20 km. altitude. In fact, the decay length is much greater, the muons can be detected even at the sea level! Because of the time dilation, in the RF of the lab observer the muon\u2019s lifetime is: N \u2013 the number of muons measured in the sea-level lab.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}