Cloud chamber observations of cosmic rays at 4300 meters elevation and near sea-level

  title={Cloud chamber observations of cosmic rays at 4300 meters elevation and near sea-level},
  author={CARL D. Anderson and Seth H. Neddermeyer},
  journal={Physical Review},
Cloud chamber photographs at 4300 meters elevation show positive and negative electron tracks similar to those observed at sea-level, but positive-negative electron showers occur more frequently and, in general, consist of more numerous tracks. Showers of 2-4 tracks, 5-10 tracks, and 11-100 tracks occur respectively, 8.6, 21 and 29 times as frequently per unit time at 4300 meters as they do near sea-level. Further measurements on the energy loss in lead of electrons up to 400 MEV, are given… 

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