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Observation of orbital magnetic dipole strength in the actinide nuclei 232Th and 238U
Affiliation:1. Experimental Physics Department, CERN, CH-1211 Geneva 23, Switzerland;2. Technische Universität Wien, AT-1040 Wien, Austria;3. Institut für Kernphysik, Department of Physics, TU Darmstadt, D-64289 Darmstadt, Germany;4. ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany;5. Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany;6. TRIUMF, Vancouver, British Columbia V6T 2A3, Canada;7. Instituut voor Kern- en Stalingsfysica, KU Leuven, B-3001, Leuven, Belgium;8. Department of Physics and Astronomy, University of Tennessee, 37996 Knoxville, TN, USA;9. School of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, United Kingdom;10. Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom;11. School of Mathematics and Physics, The University of Queensland, Brisbane QLD 4072, Australia;12. Department of Physics, University of Toronto, 60 St. George St., Toronto, Ontario, Canada;13. Institut für Kernchemie, Universität Mainz, D-55128 Mainz, Germany;14. Universität Innsbruck, AT-6020 Innsbruck, Austria;15. Université Paris-Saclay, CNRS-IN2P3, IJCLab, 91405 Orsay, France;p. Department of Physics, University of Washington, Seattle, WA, USA;q. Center for Nuclear Study, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;r. Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan;s. School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 10871, China;1. China Institute of Atomic Energy, P.O. Box 275 (10), Beijing 102413, PR China;2. National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA;1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China;1. Dipartimento di Fisica, Università degli Studi di Milano and INFN, Sezione di Milano, 20133 Milano, Italy;2. Department of Physics, Faculty of Science, University of Zagreb, Bijenička c. 32, 10000 Zagreb, Croatia;1. Institute of Applied Physics and Computational Mathematics, Beijing 100094, China;2. Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China;3. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
Abstract:Precise experimental information has been obtained on the distribution of orbital M1 strength using high resolution nuclear resonance fluorescence and inelastic electron scattering. We report on the first observation of those Jπ = 1+ states in actinide nuclei that are excited by the M1 scissors mode. The M1 strength induced through the convection current part of the M1 operator is closely centered around 2 MeV in both nuclei. The observed spreading of strength is again of the same magnitude that has been observed already in rare-earth nuclei.
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