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The Coster-Kronig probability f23 for lead has been measured by a K-x-ray -L-x-ray coincidence technique. Analytic fitting of the Ea-x-ray triplet using nonlinear least-squares methodology was employed to determine the corrections necessitated by the overlap of the Ka2 and Ka& peaks. The result, 0. 112+0.002, is to be compared with the Dirac-Hartree-Slater prediction of 0.122 and a recently measured value of 0. 130+0.002 obtained by a different approach to the overlap correction.The present result may provide an estimate of relaxation and many-body effects, whichif includedwould lower the Dirac-Hartree-Slater single-particle-model prediction.

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