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Radiationless transition probabilities in muonic208Pb,232Th,and238U |
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| Authors: | Ch Rösel P David H Folger H Hänscheid J Konijn C T A M de Laat C Petitjean H W Reist F Rissel L A Schaller L Schellenberg W Schrieder L M Simons A K Sinha A Taal |
| Institution: | 1. ISKP, University of Bonn, Nu?allee 14-16, W-5300, Bonn 1, Federal Republic of Germany 2. GSI, W-6100, Darmstadt 11, Federal Republic of Germany 4. NIKHEF-K, POB 41882, 1009, DB Amsterdam, The Netherlands 5. Physics Laboratory, University of Utrecht, 3508, TA Utrecht, The Netherlands 6. PSI, CH-5232, Villigen PSI, Switzerland 8. Institut de Physique, University of Fribourg, CH-1700, Fribourg, Switzerland 10. Nuclear Science Centre, Jawaharlal Nehru University, POB 10502, 110067, New Delhi, India |
| 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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