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Note on the Nature of Cosmic-Ray Particles

California Institute of Technology, Pasadena, California (Received March 30, 1937) MEASUREMENTS' of the energy loss of particles occurring in the cosmic-ray showers have shown that this loss is proportional to the incident energy and within the range of the measurements, up to about 400 Mev, is in approximate agreement with values calculated theoretically for electrons by Bethe and Heitler. These measurements were taken using a thin plate of lead (0.35 cm), and the observed indi- vidual losses were found to vary from an amount below experimental detection up to the whole initial energy of the particle, with a mean frac- tional loss of about 0.5. If these measurements are correct it is evident that in a much thicker layer of heavy material multiple losses should become much more important, and the probability of observing a particle loss less than a large fraction of its initial energy should be very small. For the purpose of testing this inference and also for checking our previous measurements2 which had shown the presence of some particles less (.) SJng/e part ic/es (o) Shover pa'rticles 6.) Produce showers t11 I o * . . * #: I I, . . :. .300. 500 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review American Physical Society (APS)

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