In collaboration with P. EHRENFEST, R. MAZE, J. DAUDIN, ROBLEY, A. FRAON Paris, France INTRODUCTION IT is generally admitted that the soft group present at sea level is almost entirely due to the effects of mesotrons, that is to their decay electrons and their collision electrons. These electrons should then give rise in the lower atmosphere to local showers, the intensity of which should increase very slowly with the altitude, in the same way as the hard group (mesotrons). But we know that the increase of the soft group with altitude is very rapid, so we must admit that electrons of another origin than that indicated above are adding their effects to those of the decay and collision electrons from mesotrons. It seems natural to suppose that they represent the end effects of the showers that the primary particles, probably electrons, which enter the high atmosphere produced there. If this is the case, we should be able to recognize it by the existence of a "coherence" of these shower particles, the multiple effects of a single initial particle remaining bound in time and in space. We have shown the existence of these extensive showers' and studied their properties
Reviews of Modern Physics – American Physical Society (APS)
Published: Jul 1, 1939
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