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New Evidence for the Existence of a Particle of Mass Intermediate Between the Proton and Electron

New Evidence for the Existence of a Particle of Mass Intermediate Between the Proton and Electron LETTERS TO THE EDITOR Prompt publication of brief reports of important discoveries in physics may be secured by addressing them to this department. Closing dates for this department are, for the first issue of the month, the eighteenth of the preceding month, for the second issue, the third of the month. Because of the late closing dates for the section no proof can be shown to authors. The Board of Editors does not hold itself responsible for the opinions expressed by the correspondents. Communications should not in general exceed 600 words in length. New Evidence for the Existence of a Particle of Mass Intermediate Between the Proton and Electron Anderson and Neddermyerl have shown that, for energies up to 300 and 400 Mev, the cosmic-ray shower particles have energy losses in lead plates corresponding to those predicted by theory for electrons. Recent studies of range2 and energy loSS3 indicate that the singly occurring cosmic- ray corpuscles, even in the energy range below 400 Mev, are more peneteating than shower particles of correspond- ing magnetic deflection. Thus the natural assumptions have been expressed: the shower particles are electrons, the theory describing their energy losses is satisfactory, and the singly http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review American Physical Society (APS)

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