Penetrating Cosmic Ray Showers


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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    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).

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