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New precision in cosmic ray measurements; Yielding extension of spectrum and indications of bands

Millikan, R. A. and Cameron, G. H. (1928) New precision in cosmic ray measurements; Yielding extension of spectrum and indications of bands. Physical Review, 31 (6). pp. 921-930. ISSN 0031-899X. https://resolver.caltech.edu/CaltechAUTHORS:MILpr28c

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Abstract

Method of measurement of capacities of the order of one cm. — A method is described which leads to greatly increased precision in the measurement of capacities of the order of one electrostatic unit. More penetrating cosmic rays than we have previously found are indicated by a new absorption curve obtained in Gem Lake (9080 ft.) and Lake Arrowhead (5125 ft.) with much greater precision than hitherto possible. Cosmic-ray spectrum. — The new curve affords definite evidence for the existence of bands in the spectrum of cosmic rays. The measurements indicate that the cosmic rays consist chiefly of two bands about three octaves apart of mean absorption coefficients 0.35 and 0.04 to 0.05 per meter of water. The total energy of cosmic rays at the top of the atmosphere is found to be very nearly one-tenth that due to starlight and heat as computed from Seares' data.


Item Type:Article
Additional Information:©1928 The American Physical Society. Received 19 March 1928. The whole of this cosmic-ray work has been done with the aid of funds provided by the Carnegie Corporation of New York and administered by the Carnegie Institution of Washington.
Issue or Number:6
Record Number:CaltechAUTHORS:MILpr28c
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:MILpr28c
Alternative URL:http://dx.doi.org/10.1103/PhysRev.31.921
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6624
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:15 Dec 2006
Last Modified:02 Oct 2019 23:34

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