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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

  • 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 νi13/2band with increasing angular momentum,have been discussed briefly.
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    [1] Sunyar A M. Phys. Scripta, 1981,24:2982 lister C J, Horn D, Baktssh C et al . Phys. Rev. ,1981, C23:20783 Baktash C . Transition from Collective to Noncollective Rotation at High Spin in N≈87 Nuclei, Johnson , N R ed. Proc . Conf.High Angular Momentum Properties of Nuclei. Oak Ridge, Tennessee, 1983. 2074 Baktash C ,Schutz Y ,Lee I Y et al. Phys. Rev. Lett. . 1985,54:9785 Ragnarsson 1, Bengntsson, T. Nazarewicz W et al. Phys. Rev. Lett.,1985,54:9826 Tjom P 0,Diamond R M,Bacelar J C et al. Phys. Rev. Lett., 1985,55:24057 Kortelahti M. Rroda R , Chung Y H et al. Phys. Lett. ,1983,B131 :3058 Beck F A,Byrski T, Rouabah S et al. Phys. Lett. ,1987.B192:499 Nira N. Duchene G, Iacob V E et al. Phys. Rev..2001,C64:034313-110 Horn H, Lister C J. Baktash C et al. Bull. Am. Phys. Soc. ,1979,24:69411 Hashizume .A, Katou T, Tendow Y et al. RlKEN Accel. Progr . Rep.. 1983,16:4112 Rafailovich M H , Kistner O C , Sunyar A M et a1 . Phys . Rev. ,1984. C30:169

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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.
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. shu
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Received: 2001-12-12
Revised: 1900-01-01
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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 νi13/2band with increasing angular momentum,have been discussed briefly.

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