Abstract
A study has been made of cloud chamber photographs of penetrating cosmic-ray showers, originating in lead placed over the cloud chamber and in a lead plate within the cloud chamber, obtained at altitude 3,572 m. in a magnetic field of about 1,000 gauss. The use of well-separated successive lead layers allowed the association of penetrating events to be demonstrated, and there is some evidence of a general reduction of energy involved in events in the lower lead layers as compared with those in the top layer. Mesons, protons and particles of higher charge were identified in the penetrating showers, and a mean range for non-coulomb scattering of shower particles is given. Evidence is also given of the apparent starting and stopping of charged particles in the lead plate at the centre of the cloud chamber.
Published Version
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