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

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; Chen Xingqu

Chinese Physics C> 1995, Vol. 19> Issue(3) : 193-202

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

Institute of Modern Physics, The Chinese Academy of Sciences, Lanzhou, 7300001 Department of Modern Physics, Lanzhou University, Lanzhou 730000

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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.

References

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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.

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Received: 1900-01-01
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沈阳化工大学材料科学与工程学院沈阳 110142

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

Received Date: 1900-01-01

Accepted Date: 1900-01-01

Available Online: 1995-03-05

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

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

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