Abstract
Some experiments performed by my pupils and myself during the last two years have yielded results which seem difficult to reconcile with the pure cascade theory of cosmic-ray showers. Among these are: the presence of penetrating particles (mesons) in extensive atmospheric showers (A-showers), the variation with altitude of the frequency of these A -showers, and the special structure of some local showers. Using a meson selector in coincidence with distant counters, Dr Rogozinski could explain his results by : (1) knock-on electrons accompanying a meson; (2) mesons in A -showers; (3) multiple simultaneous mesons (meson show er). This last phenomenon being frequent only in high altitude.
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More From: Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences
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