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The elastic scattering cross sections, σ (E,θ), for the systems He+Ta and He+W have been measured at θlab=165° and E lab=76.1 keV to 3.988 MeV using targets with a thickness of a few atomic layers. The results are smaller than the results given by the Rutherford scattering law, σR(E,θ), due to the effects of electron screening and can be described by σ(E,θ)/σR(E,θ)=(1+Ue/E)−1, where U e is an atomic screening potential energy. The deduced average value, U e=28 ± 3 keV, is consistent with the Moliére- and Lenz-Jensen-models as well as electron binding energies.
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Received: 25 May 1998
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Schümann, F., Zavatarelli, S., Gialanella, L. et al. Electron screening in backward elastic scattering . EPJ A 2, 337–342 (1998). https://doi.org/10.1007/s100500050130
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DOI: https://doi.org/10.1007/s100500050130