Abstract
IT is now recognized that the majority of cosmic ray showers at sea-level consist of electron cascades (see, for example, Jánossy1 and Lovell2). The present investigation gives evidence for the existence of a very small number of penetrating showers remaining after the cascades have been removed by suitable absorbers. The frequency of these penetrating showers, however, amounts only to a few per cent of all showers at sea-level. They therefore could not be detected in the experiments referred to above, or in the similar experiments of Schmeiser and Bothe3.
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References
Jánossy, L., Proc. Camb. Phil. Soc., 24, 614 (1938).
Lovell, A. C. B., Proc. Roy. Soc., A, 172, 568 (1939).
Schmeiser, K., and Bothe, W., Ann. Phys., 32, 161 (1938).
Bhabha, H. J., Proc. Roy. Soc., A, 164, 257 (1938).
Massey, H. S. W., and Corben, H. C., Proc. Camb. Phil. Soc., 35, 463 (1939).
Auger, P., Maze, R., and Grivet-Meyer, T., C.R., 206, 1723 (1938).
Wataghin, G., Souza Santos, M. de., and Pompena, P. A., Phys. Rev., 57, 61 (1940).
Braddick, H. J. J., and Hensby, G. S., NATURE, 144, 1012 (1939).
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JÁNOSSY, L., INGLEBY, P. Penetrating Cosmic Ray Showers. Nature 145, 511–512 (1940). https://doi.org/10.1038/145511a0
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DOI: https://doi.org/10.1038/145511a0
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