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IBM-2 description of M1 properties in deformed nuclei
Affiliation:1. Department of Orthopaedics, Nobel Medical College Teaching Hospital, Kanchanbari, Biratnagar, Nepal;2. Department of Orthopaedics & Trauma, B&B Hospital, Kathmandu, Nepal;1. McMaster University, Hamilton, ON, Canada;2. Lawrence Berkeley National Laboratory, Berkeley, CA, USA;3. Oak Ridge National Laboratory, Oak Ridge, TN, USA;4. National Nuclear Data Center, Brookhaven National Laboratory, Upton, NY, USA;5. Inter-University Accelerator Centre, New-Delhi, India;6. TRIUMF, Vancouver, BC, Canada;7. University of Surrey, Guildford, UK;8. N.P.L. Teddington, UK;9. University of Mumbai, Mumbai, India;10. Kharkov Institute of Physics and Technology, Kharkiv, Ukraine;11. NSCL, Michigan State University, East Lansing, MI, USA;12. Universite Freres Mentouri Constantine 1, Constantine, Algeria;13. Raiganj Surendranath Mahavidyalaya, Raiganj, India;14. Institute for Nuclear Research, National Academy of Sciences, Kiev, Ukraine;15. Department of Physics, Rajshahi University, Rajshahi, Bangladesh;p. Japan Atomic Energy Agency, Tokai, Ibaraki, Japan;q. Variable Energy Cyclotron Centre, Kolkata, India;r. Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest, Romania;s. CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), CEA-Saclay 91191 Gif/Yvette cedex, France;t. Australian National University, Canberra, ACT, Australia
Abstract:Results of schematic calculations are presented in which various terms breaking F-spin symmetry are considered in the hamiltonian of the neutron-proton interacting boson model (IBM-2). Specific attention is paid to the effect of F-spin symmetry breaking on γ → ground and γγ M1 transitions in deformed nuclei. A comparison with available M1 data in the rare-earth nuclei is presented. The constraints implied by these data on the form of the IBM-2 hamiltonian in well-deformed nuclei are discussed.
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