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Cosmic-ray energies and their bearing on the photon and neutron hypotheses

Millikan, Robert A. and Anderson, Carl D. (1932) Cosmic-ray energies and their bearing on the photon and neutron hypotheses. Physical Review, 40 (3). pp. 325-328. ISSN 0031-899X. doi:10.1103/PhysRev.40.325.

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ON NOVEMBER 20, 1931, in a lecture before a large audience gathered at the Institut Poincaré in Paris, there were presented the first direct measurements taken by Carl D. Anderson of the energies of cosmic-ray tracks made with an apparatus capable of measuring, by the method of magnetic deflectibility in air, energies of the order of magnitude to be expected in cosmic-ray photon-encounters with electrons and nuclei, namely, from 27×10^(6) volts up to at least 500×10^(6) volts. These same photographs were also shown on November 23rd at a physical seminar at the Cavendish Laboratories. Cambridge, England. The eleven cosmic-ray-track photographs shown and discussed on these occasions1 brought to light a certain number of new and important facts presented essentially as listed below in both of these lectures, and these facts have now been checked by three times as many successful exposures.

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Additional Information:©1932 The American Physical Society. Received 12 April 1932.
Issue or Number:3
Record Number:CaltechAUTHORS:MILpr32a
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6620
Deposited By: Tony Diaz
Deposited On:15 Dec 2006
Last Modified:08 Nov 2021 20:35

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