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First observation of the decay of the 13/2+ isomer in 183Hg and B(M2) systematics of neutron transitions across the nuclear chart

Journal Article · · Physics Letters. B
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  1. Chinese Academy of Sciences (CAS), Lanzhou (China). Inst. of Modern Physics
  2. Chinese Academy of Sciences (CAS), Lanzhou (China). Inst. of Modern Physics; University of Chinese Academy of Sciences, Beijing (China)
  3. Univ. of York (United Kingdom); Japan Atomic Energy Agency (JAEA), Tokai (Japan). Advanced Science Research Center (ASRC)
  4. Argonne National Lab. (ANL), Argonne, IL (United States)
  5. Peking Univ., Beijing (China). School of Physics, State Key Lab. of Nuclear Physics
  6. Petersburg Nuclear Physics Institute, Gatchina (Russian Federation)
  7. Katholieke Univ. Leuven, Heverlee (Belgium). Inst. voor Kern- en Stralingsfysica
  8. Comenius Univ., Bratislava (Slovakia)
  9. Helmholtz Institute Mainz (Germany); GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany); Johannes Gutenberg Univ., Mainz (Germany)
  10. Univ. of York (United Kingdom)
  11. Univ. of Surrey, Guildford (United Kingdom)
  12. European Organization for Nuclear Research (CERN), Geneva (Switzerland)
  13. Chinese Academy of Sciences (CAS), Lanzhou (China). Inst. of Modern Physics; University of Chinese Academy of Sciences, Beijing (China); Argonne National Lab. (ANL), Argonne, IL (United States)
  14. GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
  15. Lanzhou Univ. (China)
  16. Louisiana State Univ., Baton Rouge, LA (United States)
+ Show Author Affiliations
The decay of the 13/2+ isomeric state in 183Hg was observed for the first time following the a decay of the 13/2+ isomer in 187Pb produced in the 142Nd(50Cr, 2p3n) reaction. Using $$\alpha - \gamma$$ delayed coincidence measurements, the half-life of this isomer was measured to be 290(30) μs. This isomer is proposed to deexcite by an unobserved low-energy M2 transition to the known 9/2- member of a strongly prolate-deformed 7/2-[514] band, followed by a 105-keV M1 transition to the bandhead. A lower limit of B(M2) >= 0.018 W.u. was deduced for the unobserved transition. The presumed retardation is proposed to be due to the notable shape change between the initial, nearly spherical, and the final, strongly deformed, states. A similar scenario is also considered for the 13/2+ isomer in 181Hg, suggesting both are cases of shape isomers. The B(M2) systematics of neutron transitions across the nuclear chart is discussed.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
Chinese Academy of Sciences (CAS); National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC); Science and Technologies Facilities Council (STFC-UK); Slovak Research and Development Agency (SRDA); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
AC02-06CH11357; FG02-97ER41033
OSTI ID:
1973252
Journal Information:
Physics Letters. B, Journal Name: Physics Letters. B Vol. 833; ISSN 0370-2693
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
B(M2)
isomeric decay
shape isomer