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Identification of excited states in Bi 188 and Po 188

Journal Article · · Physical Review. C
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  1. Chinese Academy of Sciences, Lanzhou (China); Univ. of Chinese Academy of Sciences, Beijing (China); Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
  2. Univ. of York (United Kingdom); Japan Atomic Energy Agency, Tokai-mura (Japan)
  3. Chinese Academy of Sciences, Lanzhou (China); Univ. of Chinese Academy of Sciences, Beijing (China)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)
  5. Peking Univ., Beijing (China)
  6. Chinese Academy of Sciences, Lanzhou (China)
  7. Petersburg Nuclear Physics Inst., Gatchina (Russia)
  8. KU Leuven (Belgium)
  9. Univ. of York (United Kingdom)
  10. KU Leuven (Belgium); Comenius Univ. in Bratislava (Slovakia)
  11. Comenius Univ. in Bratislava (Slovakia)
  12. Helmholtz-Inst. Mainz (Germany); GSI Helmholtzzentrum für Schwerionenforschung Darmstadt (Germany); Johannes-Gutenberg Univ., Mainz (Germany)
  13. Univ. of Surrey, Guildford (United Kingdom)
  14. Univ. Paris-Saclay, Gif-sur-Yvette (France)
  15. Helmholtz-Inst. Mainz (Germany); GSI Helmholtzzentrum für Schwerionenforschung Darmstadt (Germany)
  16. GSI Helmholtzzentrum für Schwerionenforschung Darmstadt (Germany)
  17. Lanzhou Univ. (China)
  18. Louisiana State Univ., Baton Rouge, LA (United States)
+ Show Author Affiliations
The neutron-deficient 188Bi and 188Po isotopes have been studied by γ-ray spectroscopy using the recoil-decay tagging technique with the Argonne Gas-Filled Analyzer. A new 0.25(5)-μs isomeric state and a prompt cascade formed by 319-, 366-, and 462-keV γ rays have been established on top of the (10¯) α -decaying isomer in 188Bi. The first excited (2+) state in 188Po was identified, its excitation energy of 242(2) keV continues the nearly constant trend for the first 2+ states in 190, 192,194Po. Here, the state is most likely a member of a prolate rotational band built on the ground state, albeit mixing with other coexisting configurations cannot be excluded. The new results obtained in the present work provide new information to shape coexistence in bismuth and polonium isotopes near the neutron midshell at N = 104 . In this mass region, a reduction in the prompt γ-ray yield obtained with recoil decay tagging was observed for a few nuclides, and the possible reasons are presented.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
Chinese Academy of Sciences (CAS); National Key Basic Research Program of China; National Natural Science Foundation of China (NSFC); Slovak Research and Development Agency (SRDA); Triangle Universities Nuclear Laboratory (TUNL); USDOE Office of Science (SC), Nuclear Physics (NP); Universidad Nacional de Cordoba (UNC)
Grant/Contract Number:
AC02-06CH11357; FG02-97ER41033
OSTI ID:
1882379
Alternate ID(s):
OSTI ID: 1909616
Journal Information:
Physical Review. C, Journal Name: Physical Review. C Journal Issue: 2 Vol. 106; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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