First Study of EC/β+ Decay Schemes for Neutron-Deficient Isotopes 153Er and 157Yb

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Xu Shuwei, Xie Yuanxiang, Pan Qiangyan, Zhang Juping, Zhang Xueqian, Wang Yihao, Ge Yuanxiu, Yin Xijin, Wang Chunfang, Zhang Tianmei, Liu Zhong, Guo Bing, Luo Yixiao, Xing Zheng and Chen Xingqu. First Study of EC/β+ Decay Schemes for Neutron-Deficient Isotopes 153Er and 157Yb[J]. Chinese Physics C, 1995, 19(3): 193-202.
Xu Shuwei, Xie Yuanxiang, Pan Qiangyan, Zhang Juping, Zhang Xueqian, Wang Yihao, Ge Yuanxiu, Yin Xijin, Wang Chunfang, Zhang Tianmei, Liu Zhong, Guo Bing, Luo Yixiao, Xing Zheng and Chen Xingqu. First Study of EC/β+ Decay Schemes for Neutron-Deficient Isotopes 153Er and 157Yb[J]. Chinese Physics C, 1995, 19(3): 193-202. shu
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Revised: 1900-01-01
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First Study of EC/β+ Decay Schemes for Neutron-Deficient Isotopes 153Er and 157Yb

    Corresponding author: Xu Shuwei,
  • Institute of Modern Physics, The Chinese Academy of Sciences, Lanzhou, 7300001 Department of Modern Physics, Lanzhou University, Lanzhou 730000

Abstract: 153Er and 157Yb were produced via xu fusion-evaporation reaction by irradiation of 142Nd and 147Sm with 16O, respectively. A He-jet recoil tape transport system, X-γ and γ-γ coincidence measurements were employed to separate and identify the reaction products and to study the EC/β+ decay of 153Er and 157Yb. The EC/β+ decay schemes of 153Er and 157Yb have been proposed for the first time, from which a new three qussi-particle state and two new single proton states have been assigned to 153Ho, and a new isomer and a new rotational band have been assigned to 157Tm. According to systematic behaviour of the low-laying energy levels for odd holmium and odd thulium isotopes with N=82-102, it can be seen that the change from spherical to deformed shapes of nuclear ground states in the two isotope chains appears between N=86 and 88.

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