Abstract
The probabilities for non-radiative (n.r.) excitationsP n.r. in the muonic nuclides208Pb,232Th, and238U have been determined from (μ−,γγ)-measurements by comparing the intensities of muonic X-ray transitions in single and coincidence spectra. The value ofP n.r. (3p→1s), measured for the first time, is about 90% for the actinides232Th and238U, but only about 8% for208Pb. The value ofP n.r. (3d→1s) is found to be 10 % for233Th, 13% for238U, and about 4% for208Pb. For208Pb a vanishing strength of the n.r. decay of the 2p-level is found, while for232Th and for238U n.r. strengths of about 20% and 26%, respectively, are observed. By regarding two subcomplexes of the 2p→1s transitions leading to different mean excitation energies the n.r. transition probabilities were found to be different for238U only, 21.6% and 31.1.%, respectively.
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It is a pleasure to thank Professor T. Mayer-Kuckuk for his cooperation in performing the project. We gratefully acknowledge the permanent support of Professor J.P. Blaser and his staff at PSI. We are thankful to Professor S. Polikanov (GSI) and to Dr. T. Krogulski (University of Warsaw, Bialystok) for intensive and fruitful discussions. We are grateful for the support by the Kernforschungszentrum Karlsruhe and to Professor G. Schatz and to Dr. H. Schweickart and their staff te the preparation of calibration sources. We thank Professor D.F. Zaretski and Dr. F. F. Karpeshin for clarifying discussions. This work has been funded by the German Federal Minister for Research and Technology (BMFT) under the contract number 06BN271 (PD, HH, FR, ChR, WS). We thank the following institutions and organisations for financial support: Foundation for Fundamental Research on Matter (FOM), the Netherlands Organisation of the Advancement of Pure Research (NWO) (JK, CdL, AT), the Swiss National Foundation (SNF) (LAS, LS), and the Alexander-von-Humboldt-Foundation (AvH) (AKS). One of the authors (ChR) is grateful to the Graduiertenförderung des Landes Nordrhein-Westfalen for granting a fellowship.
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Rösel, C., David, P., Folger, H. et al. Radiationless transition probabilities in muonic208Pb,232Th, and238U. Z. Physik A - Hadrons and Nuclei 340, 199–208 (1991). https://doi.org/10.1007/BF01303833
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DOI: https://doi.org/10.1007/BF01303833