Abstract
In order to test the QED corrections, and in particular the vacuum polarization, muonic 4f-3d transitions in Ba and Ce and 5g-4f transitions in Tl and Pb have been measured using Ge(Li) detectors. An absolute energy accuracy of ± 8 eV corresponding to a relative error of 17–19 ppm has been obtained. The experimental energies agree with theory within the total uncertainty of ± 10 eV. This corresponds to a test of the QED vacuum polarization calculations of between 0.35 % and 0.50 %.
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