Multi-quasiparticle isomers and rotational bands in 178W |
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| Affiliation: | 1. Department of Physics, University of Surrey, Guildford GU2 5XH, UK;2. Department of Nuclear Physics, Research School of Physical Sciences and Engineering, Australian National University, Canberra ACT 0200, Australia;3. Department of Mechanical and Manufacturing Engineering, University of Brighton, Brighton BN2 4GJ, UK;4. Institut de Recherches Subatomiques, 23, rue du Loess, F-67037 Strasbourg Cedex 2, France;1. Department of Physics, Southeast University, Jiulonghu Campus, Nanjing 211189, China;2. College of Physical Science and Technology, Sichuan University, Chengdu, Sichuan 610064, China;3. School of Natural Sciences, University of California, Merced, CA 95343, USA;1. Department of Physics, National Institute of Technology, Kurukshetra, 136119, India;2. CSIR-Central Scientific Instrument Organisation (CSIR-CSIO), Chandigarh, 160030, India;3. Department of Applied Physics, Delhi Technological University, New Delhi, 110042, India;1. Toulouse School of Economics, France;2. Norwegian School of Economics (NHH), Norway;1. Department of Theoretical Physics, Horia Hulubei National Institute for Physics and Nuclear Engineering, 30 Reactorului, RO-077125, POB-MG6, Bucharest-Magurele, Romania;2. Academy of Romanian Scientists, 3 Ilfov, Bucharest, Romania |
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| Abstract: | The high spin structure of the nucleus 178W has been studied following the 170Er(13C,5n) reaction. Many previously unidentified rotational bands are seen based on high-K, 2-, 4-, 6- and 8-quasiparticle structures, some of which are isomeric. The excitation energies of the multi-quasiparticle bandheads are compared with BCS calculations, including residual interactions. The bands show substantial increases in moments-of-inertia with increasing quasiparticle number. These are examined in terms of pairing blocking. The effect of blocked pairing is also taken into account in the calculation of g-factors, which supports the configuration assignments. The Kπ = 25+, 8-quasiparticle band forms the yrast line from its bandhead upwards. This bandhead is a 220 ns isomer whose decay is strongly hindered, compared to the decay of the four- and six-quasiparticle structures. |
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