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Competition between collective oblate rotation and non-collective prolate K isomerism in neutron-rich tungsten isotopes

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Abstract

Recent experiments open up the possibility to investigate oblate rotation-aligned states and prolate high-K isomers in neutron-rich tungsten isotopes. In the present work, we perform the projected-shell-model calculations for A ∼ 190 tungsten nuclei. The 190W results are compared with experimental data. The observed 8+ isomer is assigned as a two-quasiproton K π = 8+ configuration. Low-lying high-K four-quasiparticle states are predicted. Of particular interest is the prediction of the K π = 20+ state in 190,192W, which may form a long-lived spin trap. In competition with the prolate high-K states, rotational alignment leads to near-yrast collective oblate rotation.

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Authors and Affiliations

  1. State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing, 100871, China

    ChangFeng Jiao, Yue Shi & FuRong Xu

  2. Center for Theoretical Nuclear Physics, National Laboratory for Heavy Ion Physics, Lanzhou, 730000, China

    FuRong Xu & Yang Sun

  3. Department of Physics, Shanghai Jiao Tong University, Shanghai, 200240, China

    Yang Sun

  4. Department of Physics, University of Surrey, Guildford, Surrey, GU2 7XH, UK

    P. M. Walker

  5. CERN, CH-1211, Geneva 23, Switzerland

    P. M. Walker

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  1. ChangFeng Jiao
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  2. Yue Shi
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  3. FuRong Xu
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  4. Yang Sun
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  5. P. M. Walker
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Correspondence to FuRong Xu.

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Jiao, C., Shi, Y., Xu, F. et al. Competition between collective oblate rotation and non-collective prolate K isomerism in neutron-rich tungsten isotopes. Sci. China Phys. Mech. Astron. 55, 1613–1617 (2012). https://doi.org/10.1007/s11433-012-4824-4

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  • DOI: https://doi.org/10.1007/s11433-012-4824-4

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