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Consistent empirical description of magnetic moments and M1 transitions: Quenching of the diagonal and off-diagonal spin matrix elements
Affiliation:1. RIKEN Nishina Center, Wako 351-0198, Japan;2. School of Physical Science and Technology, Southwest University, Chongqing 400715, China;3. Department of Physics, Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan;4. RIKEN Interdisciplinary Theoretical and Mathematical Sciences Program, Wako 351-0198, Japan;1. Institut de Physique Nucléaire, IN2P3-CNRS, Université Paris-Sud, F-91406 Orsay Cedex, France;2. CEA, DAM, DIF, 91297 Arpajon, France;3. Nuclear and Chemical Science Division, Lawrence Livermore National Laboratory, Livermore, CA 94551, USA;1. Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA;2. Cyclotron and Radioisotope Center, Tohoku University, Sendai 980-8578, Japan;3. Department of Physics, Konan University, Hyogo 658-8501, Japan;4. Astronomy and Physics Department, Saint Mary''s University, Halifax, NS B3H 3C3, Canada;5. GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany;6. Justus-Liebig University, 35392 Giessen, Germany;7. Department of Physics, Kyoto University, Kitashirakawa Oiwake, Sakyo, Kyoto 606-8502, Japan;8. Research Center for Nuclear Physics, Osaka University, Osaka 567-0047, Japan;9. KVI-CART, University of Groningen, 9747 AA Groningen, the Netherlands;10. Department of Physics, Osaka University, Toyonaka, Osaka 540-0043, Japan;11. Center for Nuclear Study, The University of Tokyo, Wako, Saitama 351-0198, Japan
Abstract:The spin and tensor parts of an effective M1 operator for nuclei around 90Zr and 208Pb are empirically determined by minimizing simultaneously the deviation of measured magnetic moments and M1 transitions from standard shell model calculations performed within lowest order shell-model spaces. The results are linked to a previous analysis of sd-shell nuclei and show approximately the mass dependence of the combined influence of high-lying many-particle-many-hole excitations admixed via the tensor force and of Δ-h admixtures.
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