Structure of even-even actinides in the interacting boson model and the N = 152 subshell closure |
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| Affiliation: | 1. Department of Nuclear Physics, University of Oxford, Keble Road, Oxford OX1 3RH, UK;1. Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, United States;2. Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan;3. RIKEN Nishina Center, Wako 351-0198, Japan;4. Center for Mathematics and Physics University of Aizu, Aizu Wakamatsu, Fukushima 965-0001, Japan;1. Brookhaven National Laboratory, Upton, NY 11973-5000, USA;2. Los Alamos National Laboratory, Los Alamos, NM 87545, USA;3. International Atomic Energy Agency, PO Box 100, A-1400 Vienna, Austria;4. Rensselaer Polytechnic Institute, Troy, NY 12180, USA;5. National Institute of Standards and Technology, Gaithersburg, MD 20899-8463, USA;6. Spectra Tech, Inc., Oak Ridge, TN 37830, USA;7. Argonne National Laboratory, Argonne, IL 60439-4842, USA;8. Oak Ridge National Laboratory, Oak Ridge, TN 37831-6171, USA;9. Lawrence Livermore National Laboratory, Livermore, CA 94551-0808, USA;10. Gesellschaft für Anlagen und Reaktorsicherheit, Schwertnergasse 1, D-50667 Köln, Germany;11. Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA;12. AWE plc, Reading RG7 4PR, United Kingdom;13. North Carolina State University, Raleigh, NC 27695, USA;14. Naval Nuclear Laboratory, West Mifflin, PA 15122, USA;15. University of Michigan, Ann Arbor, MI 48109, USA;p. EC-JRC, B-2440 Geel, Belgium;q. Institut de Radioprotection et de Sûreté Nucléaire, 92262 Fontenay aux Roses, Cedex, France;r. Naval Nuclear Laboratory, Niskayuna, NY 12309, USA;s. Centro Atómico Bariloche, S. C. de Bariloche, Argentina;t. TRIUMF, Vancouver, BC V6T 2A3, Canada;u. CEA, DEN, DER, SPRC, Cadarache, 13108 Saint-Paul-lèz-Durance, France;v. PI Atomstandart at SC Rosatom, Moscow, Russian Federation;w. Canadian Nuclear Laboratories, Chalk River, Ontario, Canada;x. Paul Scherrer Institut, 5232 Villigen, Switzerland;y. Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz, 1 76344 Eggenstein-Leopoldshafen, Germany;z. University of Bucharest, Bucharest-Magurele, RO-077125, Romania;11. Institute for Nuclear Research and Nuclear Energy, BAS, BG-1784 Sofia, Bulgaria;12. Joint Institute for Energy and Nuclear Research, Minsk, Belarus;13. NRG, Westerduinweg 3, 1755 LE Petten, The Netherlands;1. Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan;2. Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87544, USA;3. P. Moller Scientific Computing and Graphics, Inc., P. O. Box 1440, Los Alamos, NM 87544, USA;1. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, People''s Republic of China;2. School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, People''s Republic of China;3. School of Physics Science and Technology, Lanzhou University, Lanzhou 730000, People''s Republic of China;4. School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, People''s Republic of China;5. Fakultät für Physik, Technische Universität München, D-85748 Garching, Germany |
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| Abstract: | We show that a wide range of deformed actinides can be described in terms of an interacting boson model hamiltonian with three parameters, two of them [including the coefficient of the only SU(3) symmetry breaking term] remaining almost constant over the whole region. In addition to ground γ1 and β1 spectra, B(E2:0g+ → 2g+) values are well reproduced with no extra adjustable parameters for nuclei with 136⩽N⩽146, while for nuclei beyond N = 146 an effective boson number has to be considered in order to fit the observed in the B(E2:0+g → 2+g) values, which is due to the presensce of a subshell closure at N = 152. The sensitive dependence of the B(E2:0g+→2g+) values on the effective boson numbers is emphasized. β1 → ground and β1 → ground transitions are fitted by breaking the SU(3) symmetry of the E2 transition operator. |
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