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Rotational bands and signature inversion phenomena in πh9/2⊗νi13/2 and πi13/2⊗νi13/2 structures in odd-odd 176Ir

  • Y.H. Zhang
  • M. Oshima
  • Y. Toh
  • M. Koizumi
  • A. Osa
  • T. Shizuma
  • T. Hayakawa
  • M. Sugawara
  • H. Kusakari
  • T. Morikawa
  • S.X. Wen
  • L.H. Zhu

Abstract:

High-spin states in 176Ir have been investigated via the 149Sm(31P,4nγ) 176Ir reaction through excitation functions, X-γ and γ-γ coincidence measurements. Four rotational bands have been identified for the first time and their configurations are suggested on the basis of the existing knowledge of band structures in odd-odd nuclei as well as the measured in-band B(M1)/B(E2) ratios. Among the four bands observed, the πh9/2⊗νi13/2 and πi13/2⊗νi13/2 bands exhibit an anomalous signature splitting. The signature inversion point is observed in the former at Ic = 18? which is consistent with expectations; this signature inversion spin in the πi13/2⊗νi13/2 band may be larger than 25?. The combined effects of Coriolis and p-n residual interactions involved in such an inversion phenomenon have been discussed qualitatively.

PACS. 21.10.Re Collective levels – 23.20.Lv Gamma transitions and level energies – 27.70.+q 150 ?A? 189 

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2002

Authors and Affiliations

  • Y.H. Zhang
    • 1
  • M. Oshima
    • 2
  • Y. Toh
    • 2
  • M. Koizumi
    • 2
  • A. Osa
    • 2
  • T. Shizuma
    • 2
  • T. Hayakawa
    • 2
  • M. Sugawara
    • 3
  • H. Kusakari
    • 4
  • T. Morikawa
    • 5
  • S.X. Wen
    • 6
  • L.H. Zhu
    • 6
  1. 1.Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, PRCCN
  2. 2.Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki 319-1195, JapanJP
  3. 3.Chiba Institute of Technology, Narashino, Chiba 275-0023, JapanJP
  4. 4.Chiba University, Inage-ku, Chiba 263-8512, JapanJP
  5. 5.Department of Physics, Kyushu University, Fukuoka 812-81, JapanJP
  6. 6.China Institute of Atomic Energy, Beijing, 102413, PRCCN

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