Abstract
Relative differential cross sections for elastic scattering of 5--50-eV positrons by argon atoms at angles from 30{degree} to 134{degree} 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.
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