Shape Co-existence in <SUP>157</SUP>Yb

ZHOU Xiao-Hong; ZHENG Yong; ZHANG Yu-Hu; GUO Ying-Xiang; LEI Xiang-Guo; LIU Zhong; HE Jian-Jun; LIU Min-Liang; LUO Wan-Ju; WEN Shu-Xian; ZHU Li-Hua; YANG Chun-Xiang

Chinese Physics C> 2002, Vol. 26> Issue(5) : 441-444

Shape Co-existence in ¹⁵⁷Yb

Institute of Modern Physics,The Chinese Academy of Sciences,Lanzhou 730000,China2 China Institute of Atomic Energy,Beijing 102413,China

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Abstract：
The excited states of ¹⁵⁷Yb have been studied in the ¹⁴⁴Sm(¹⁶O,3n) reaction at ¹⁶O energy of 90MeV using techniques of in beam γ-ray spectroscopy. The level scheme for ¹⁵⁷Yb was established based on the measured results of γ-γ coincidences,γ-ray anisotropies and DCO ratios. The level scheme is dominated by two parallel de-exciting sequences with different characteristics,which correspond to collective rotation and single particle excitations,respectively. This shape co-existence,as well as the structural evolution of the yrast νi_13/2band with increasing angular momentum,have been discussed briefly.

References

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ZHOU Xiao-Hong, ZHENG Yong, ZHANG Yu-Hu, GUO Ying-Xiang, LEI Xiang-Guo, LIU Zhong, HE Jian-Jun, LIU Min-Liang, LUO Wan-Ju, WEN Shu-Xian, ZHU Li-Hua and YANG Chun-Xiang. Shape Co-existence in ¹⁵⁷Yb[J]. Chinese Physics C, 2002, 26(5): 441-444.

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Received: 2001-12-12
Revised: 1900-01-01

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通讯作者: 陈斌, [email protected]

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沈阳化工大学材料科学与工程学院沈阳 110142

Shape Co-existence in ¹⁵⁷Yb

Corresponding author: ZHOU Xiao-Hong,

Institute of Modern Physics,The Chinese Academy of Sciences,Lanzhou 730000,China2 China Institute of Atomic Energy,Beijing 102413,China

Received Date: 2001-12-12

Accepted Date: 1900-01-01

Available Online: 2002-05-05

Abstract: The excited states of ¹⁵⁷Yb have been studied in the ¹⁴⁴Sm(¹⁶O,3n) reaction at ¹⁶O energy of 90MeV using techniques of in beam γ-ray spectroscopy. The level scheme for ¹⁵⁷Yb was established based on the measured results of γ-γ coincidences,γ-ray anisotropies and DCO ratios. The level scheme is dominated by two parallel de-exciting sequences with different characteristics,which correspond to collective rotation and single particle excitations,respectively. This shape co-existence,as well as the structural evolution of the yrast νi_13/2band with increasing angular momentum,have been discussed briefly.

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Shape Co-existence in ¹⁵⁷Yb

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Shape Co-existence in 157Yb

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Shape Co-existence in 157Yb

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Shape Co-existence in ¹⁵⁷Yb

Shape Co-existence in ¹⁵⁷Yb