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Thin films for slow positron generation

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Abstract

We report on calculated slow-positron yields from μm thick W(110) and Cu(111) single crystals in a transmission geometry to be used in conjuction with a22Naβ + source. The fast to slow positron moderation efficiencies were found to be comparable (≳ 10−3 to the more conventional single-crystal moderators used in the backscattering geometry with a58Co source. This allows the construction of more simplified slow-positron beams. We also calculate the brightness enhancement and efficiency of ultrathin single-crystal metal foils used for remoderation of the slow-positron beam. The results are consistent with recent experiments, while they are smaller than previous theoretical estimates.

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Vehanen, A., Mäkinen, J. Thin films for slow positron generation. Appl. Phys. A 36, 97–101 (1985). https://doi.org/10.1007/BF00620615

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