Signature Inversion in the Rotational Bands of Odd-Odd <SUP>178</SUP>Ir

ZHANG YuHu

Chinese Physics C> 2000, Vol. 24> Issue(12) : 1123-1130

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

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

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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 πh_9/2νi_13/2 and the πh_11/2νi_13/2 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 πh_9/2νi_13/2, semidecoupled band and at Ic=16 h for the πh_11/2νi_13/2 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 πh_11/2νi_13/2 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.

References

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[2]	ZHANG Yu-Hu , ZHOU Xiao-Hong , HE Jian-Jun , LIU Zhong , FANG Yong-De , GUO Wen-Tao , LEI Xiang-Guo , GUO Ying-Xiang , MA Long , Moyo Ndontchueng . Search for Signature Inversion in the πi_13/2⊙νi_13/2 Bands in ^182,184,186Au. Chinese Physics C, 2006, 30(S2): 208-210.
[3]	ZHOU Xiao-Hong , XING Ye-Bing , MA Long , ZHANG Yu-Hu , LIU Yuan . Low-Spin Signature Inversion in the πh_9/2⊙νi_13/2 Oblate Band. Chinese Physics C, 2006, 30(S2): 211-213.
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[8]	ZHU Sheng-Jiang , XIAO Shu-Dong , CHE Xing-Lai , YU Ying-Nan , LI Ming-Liang , CHEN Yong-Jing , ZHU Li-Hua , WEN Shu-Xian , WU Xiao-Guang , LI Guang-Sheng . Collective Dand Structures in Doubly Odd ¹³⁶La Nucleus. Chinese Physics C, 2005, 29(11): 1047-1051.
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[12]	ZHANG Yu-Hu , ZHOU Xiao-Hong , HE Jian-Jun , LIU Zhong , GAN Zai-Guo , , , , , , , , , , . Study of Signature Inversion in the πi_13/2νi_13/2Bands of Odd Odd Nuclei. Chinese Physics C, 2003, 27(4): 313-318.
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[15]	ZHANG Yu-Hu . Experimental Study of High-Spin States in Deformed Odd-Odd ¹⁸⁰ Ir. Chinese Physics C, 2002, 26(6): 582-588.
[16]	ZHANG Yu-Hu , WEN Shu-Xian , ZHU Li-Hua . Signature Inversion Phenomena in the Rotational Bands of Odd-Odd ¹⁷⁶Ir. Chinese Physics C, 2002, 26(5): 445-449.
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[18]	Zhang Yuhu , Zhao Qingzhong , Zhou Xiaohong Xu Hushan , Guo Yingxiang , Lei Xiangguo , Lu Jun , Zhu Shaofei , Gou Quanbu , Jin Hanjuan , Liu Zhong , Luo Yixiao , Sun Xiangfu , Zhu Yongtai , . Band Structure in Doubly Odd ¹⁷⁰Ta. Chinese Physics C, 1997, 21(2): 187-191.
[19]	Zhang Yuhu , Zhao Qingzhong , Zhou Xiaohong , Sun Xiangfu , Lei Xiangguo , Guo Yingxiang , Liu Zhong , Chen Xinfeng , Zhu Yongtai , Wen Shuxian , Yuan Guanjun , Liu Xiangan . High-Spin States in ¹⁶²Lu and Signature lnversion of Yrast Bands in Doubly Odd Nuclei Around A=160 Mass Region. Chinese Physics C, 1997, 21(5): 393-401.
[20]	Xing Zheng , Chen Xingqu . Analysis of Identical Bands for Odd-A Superdeformed Nuclei in A～190 Mass Region. Chinese Physics C, 1995, 19(4): 354-358.

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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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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

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

Received Date: 1999-12-02

Accepted Date: 1900-01-01

Available Online: 2000-12-05

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 πh_9/2νi_13/2 and the πh_11/2νi_13/2 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 πh_9/2νi_13/2, semidecoupled band and at Ic=16 h for the πh_11/2νi_13/2 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 πh_11/2νi_13/2 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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Signature Inversion in the Rotational Bands of Odd-Odd ¹⁷⁸Ir

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