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The positive electron

Anderson, Carl D. (1933) The positive electron. Physical Review, 43 (6). pp. 491-494. ISSN 0031-899X. doi:10.1103/PhysRev.43.491.

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Out of a group of 1300 photographs of cosmic-ray tracks in a vertical Wilson chamber 15 tracks were of positive particles which could not have a mass as great as that of the proton. From an examination of the energy-loss and ionization produced it is concluded that the charge is less than twice, and is probably exactly equal to, that of the proton. If these particles carry unit positive charge the curvatures and ionizations produced require the mass to be less than twenty times the electron mass. These particles will be called positrons. Because they occur in groups associated with other tracks it is concluded that they must be secondary particles ejected from atomic nuclei.

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Additional Information:©1933 The American Physical Society. Received 28 February 1933. I wish to express my great indebtedness to Professor R. A. Millikan for suggesting this research and for many helpful discussions during its progress. The able assistance of Mr. Seth H. Neddermeyer is also appreciated.
Issue or Number:6
Record Number:CaltechAUTHORS:ANDpr33b
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:7189
Deposited By: Tony Diaz
Deposited On:16 Jan 2007
Last Modified:08 Nov 2021 20:40

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