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Abstract
We have measured the energy dependence of the elastic specular reflection of positrons from the (111) surfaces of solid rare-gas crystals. For each sample we observe an intense first-order Bragg peak with a profile closely resembling the ideal ''top-hat shaped'' profile first derived by Darwin. The well-defined width and center of the peak enables us to determine the positron-energy gap and inner potential as a sensitive test of the positron--gas-atom interaction in the solid.
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