Published March 1, 1935 | Version public
Journal Article Open

A note on the production of cosmic-ray showers

Abstract

The cosmic-ray showers, which are shown so beautifully in the counter controlled cloud chamber,(1) have been investigated by numerous observers. The method in general has consisted in putting three Geiger counters below a thin plate of heavy material. The counters are usually arranged so that three particles emerging simultaneously from the plate are required to register a coincidence. Hence a shower will consist of at least three particles associated in time.

Additional Information

©1935 The American Physical Society. Received 6 February 1935. I wish to thank the Water Department of the City of Pasadena for permission to use the Morris Dam. I also wish to thank C. D. Anderson and R. A. Millikan for many helpful suggestions.

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2007-08-23
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