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Scattering of 200-Mev positrons by electrons

Poirier, J. A. and Bernstein, D. M. and Pine, Jerome (1960) Scattering of 200-Mev positrons by electrons. Physical Review, 117 (2). pp. 557-565. ISSN 0031-899X.

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Scattering of positrons by electrons has been investigated by bombarding a beryllium target with 200-Mev positrons and observing the recoil electrons in a diffusion cloud chamber located behind the target. The cloud chamber was in a magnetic field which permitted the yield of recoil electrons to be measured as a function of their energy W. The experiment covered the range 88<~W<~200 Mev. The positron beam also traversed the cloud chamber and the total number of incident positrons was determined by track-counting. The total electron yield for 88<~W<~200 Mev is (113±9)% below that predicted by the first-order Bhabha theory. This difference cannot be interpreted until radiative corrections to the theory have been evaluated. A calculation of these corrections which is valid for the conditions of this experiment is not available. The shape of the electron energy spectrum is in good agreement with the Bhabha theory, and inconsistent with the theory if annihilation terms are omitted.

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Additional Information:©1960 The American Physical Society. Received 10 August 1959. We wish to thank Professor W. K. H. Panofsky for aid and advice during the execution of the experiment; Dr. Burton Richter for suggesting the experiment; Lynn Boyer for constructing much of the necessary equipment; Miss Anna Mary Bush and Mrs. Barbara Sanders for scanning the cloud chamber pictures; and the operators and crew of the Mark III linear accelerator.
Issue or Number:2
Record Number:CaltechAUTHORS:YOUprd72
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3220
Deposited By: Tony Diaz
Deposited On:23 May 2006
Last Modified:02 Oct 2019 23:01

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