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Nuclear excitation and prompt fission in muonic238U |
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| Authors: | H. Hänscheid P. David H. Folger J. Konijn C. T. A. M. de Laat C. Petitjean H. W. Reist F. Risse Ch. Rösel L. A. Schaller L. Schellenberg W. Schrieder L. M. Simons A. Taal |
| Affiliation: | 1. ISKP, Universit?t Bonn, Nussallee 14-16, W-5300, Bonn 1, Federal Republic of Germany 3. 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, 3584, CC Utrecht, The Netherlands 6. PSI, CH-5234, Villigen PSI, Switzerland 8. Institut de Physique, Université de Fribourg, CH-1700, Fribourg, Switzerland |
| Abstract: | A study of muonic238U has been performed in a combined (μ ?,γ f) and (μ ?,γγ) coincidence experiment to investigate the role of non-radiative transitions and their fission probabilities. An augmentation of the outer fission barrier ofΔE b =(0.6±0.1) MeV due to the presence of the muon is deduced. A significant contribution to the prompt fission yield not only results from the (2p→1s) and (3d→1s) non-radiative transitions, but also from other radiationless transitions. Specifically, the measured fission probabilities of the transitions (2p→1s), (3d→1s), and (3p→1s) are (1.5±0.4)%, (5.7±1.7)%, and (5.3±1.9)%, respectively. |
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