Evidence for absorption effects in positron elastic scattering by argon
- 12 March 1990
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 64 (11) , 1227-1230
- https://doi.org/10.1103/physrevlett.64.1227
Abstract
Relative differential cross sections for elastic scattering of 5–50-eV positrons by argon atoms at angles from 30° to 134° are measured in a crossed-beam experiment. These measurements provide strong evidence that the positronium formation channel (threshold=9.0 eV) is having a significant ‘‘absorption’’ effect on the elastic-scattering channel, as is observed by the ‘‘washing out’’ of clear structure (a maximum and minimum) present in the measured elastic differential cross section below 9.0 eV (where good agreement is found with theory) when the positron energy is increased to higher energies.Keywords
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