Signature Inversion in the Rotational Bands of Odd-Odd 178Ir

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ZHANG YuHu. Signature Inversion in the Rotational Bands of Odd-Odd 178Ir[J]. Chinese Physics C, 2000, 24(12): 1123-1130.
ZHANG YuHu. Signature Inversion in the Rotational Bands of Odd-Odd 178Ir[J]. Chinese Physics C, 2000, 24(12): 1123-1130. shu
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Received: 1999-12-02
Revised: 1900-01-01
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Signature Inversion in the Rotational Bands of Odd-Odd 178Ir

    Corresponding author: ZHANG YuHu,
  • Institute of Modern Physics, The Chinese Academy of Sciences, Lanzhou 730000, China2 Japan Atomic Energy Research Institute,Tokai,Ibaraki 319- 1195,Japan3 Chiba University, Inage-ku, Chiba 263-8512,Japan4 Chiba Institute of Technology, Narashino, Chiba 275-0023,Japan5 Institute of Physics and Tandem Accelerator Center,University of Tsukuba,Ibaraki 305-0006,Japan

Abstract: High-spin states in 178Ir have been produced and studied via the 152Sm(30p,5nγ)178Ir reaction. In-beam γ rays were measured including the excitation functions at 150,155,160,165 and 170 MeV beam energies,K X-γ and γ-γ coincidences at 160 MeV. According to the band structure characteristics and the deduced intra-band B (M1)/B (E2) ratios, two rotational bands are identified for the first time and assigned to be associated with the πh9/2νi13/2 and the πh11/2νi13/2 quasiparticle configurations respectively. Low-spin signature inversion in bob bands has been confirmed hased on the observation of signature crossing at Ic=21h for the πh9/2νi13/2, semidecoupled band and at Ic=16 h for the πh11/2νi13/2 strongly coupled band, respectively. Systematics of the signature inversion has been discussed for the semidecoupled bands in the A=160-180 mass region and some regularities are proposed concerning the crossing spins with variation of mass. The signature splitting in the πh11/2νi13/2 band of 178Ir is smaller than that in the similar band of 176Re; this trend is opposite to the predictions based on the projected shell model.

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