Abstract
L-subshell ionisation cross sections were determined experimentally for Dy and Yb bombarded by 1-3 MeV protons. Thin carbon-backed targets were employed and the L X-rays emitted were measured with Si(Li) X-ray detector, the efficiency of which was measured independently. Target thicknesses were determined using the Rutherford back-scattering technique. The measured cross sections and their ratios were compared with the predictions of the PWBA and the CEPSSR theories, with particular attention being paid to the energy dependence exhibited by the cross sections. Factors which may account for the significant discrepancies observed between experiment and theory are noted.
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