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New evidence as to the nature of the incoming cosmic rays, their absorbability in the atmosphere, and the secondary character of the penetrating rays found in such abundance at sea level and below

Bowen, I. S. and Millikan, R. A. and Neher, H. Victor (1938) New evidence as to the nature of the incoming cosmic rays, their absorbability in the atmosphere, and the secondary character of the penetrating rays found in such abundance at sea level and below. Physical Review, 53 (3). pp. 217-223. ISSN 0031-899X. http://resolver.caltech.edu/CaltechAUTHORS:BOWpr38b

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Abstract

The intensity of latitude-sensitive cosmic rays as would be measured by an electroscope placed just outside the atmosphere has been calculated. The ionization due to incoming electrons of 10 billion electron volts energy in this same electroscope placed 1/20th of an atmosphere beneath the top is found to be 13 times that outside. Electrons do not become penetrating by virtue of high energies even up to 17 billion electron volts. Neither protons nor other penetrating particles of any sort enter the atmosphere in significant numbers from outside the atmosphere. The observed penetrating particles and all other cosmic-ray effects, latitude-sensitive and non-latitude-sensitive, found in the lower atmosphere are practically all secondary effects—splashes from the absorption of electrons, or photons, or both taking place in the outer layers of the atmosphere.


Item Type:Article
Additional Information:©1938 The American Physical Society. Received 29 November 1937.
Record Number:CaltechAUTHORS:BOWpr38b
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:BOWpr38b
Alternative URL:http://dx.doi.org/10.1103/PhysRev.53.217
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:5395
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:16 Oct 2006
Last Modified:26 Dec 2012 09:05

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