Shape co-existence and structural evolution of the yrast band in $\chem{^{157}Yb}$

Y. Zheng; X.H. Zhou; Y.H. Zhang; Y.X. Guo; X.G. Lei; Z. Liu; J.J. He; M.L. Liu; W.J. Luo; S.X. Wen; L.H. Zhu; C.X. Yang

doi:doi:10.1140/epja/i2002-10025-9

EPJ

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2022 Impact factor 2.7

Hadrons and Nuclei

Eur. Phys. J. A 14, 133-136 (2002)
DOI: 10.1140/epja/i2002-10025-9

Short Note

Shape co-existence and structural evolution of the yrast band in $\chem{^{157}Yb}$

Y. Zheng¹, X.H. Zhou¹, Y.H. Zhang¹, Y.X. Guo¹, X.G. Lei¹, Z. Liu¹, J.J. He¹, M.L. Liu¹, W.J. Luo¹, S.X. Wen², L.H. Zhu² and C.X. Yang²

¹ Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, PRC
² China Institute of Atomic Energy, Beijing 102413, PRC

zhengyong@impcas.ac.cn

(Received: 7 January 2002 / Revised version: 10 April 2002 Communicated by D. Schwalm)

Abstract
The high-spin states of ¹⁵⁷Yb have been studied via the ¹⁴⁴Sm( ¹⁶ O, 3n) reaction at ¹⁶O energy of 90 MeV using techniques of in-beam $\gamma$ -ray spectroscopy. Measurement of $\gamma$ - $\gamma$ - t coincidences was performed with 11 BGO(AC)HPGe detectors. Based on the measured results of $\gamma$ - $\gamma$ coincidences, $\gamma$ -ray anisotropies and DCO ratios, the level scheme for ¹⁵⁷Yb was established. The shape co-existence and structural evolution of the $\nu i _{13/2}$ band with increasing angular momentum in ¹⁵⁷Yb have been discussed. The systematics of the $\nu i _{13/2}$ bands in the N=87 odd- A isotones have been compared.