Shape co-existence and structural evolution of the yrast band in 157Yb |
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| Authors: | Y Zheng XH Zhou YH Zhang YX Guo XG Lei Z Liu JJ He ML Liu WJ Luo SX Wen LH Zhu CX Yang |
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| Institution: | (1) Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, PRC, CN;(2) China Institute of Atomic Energy, Beijing 102413, PRC, CN |
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| Abstract: | The high-spin states of 157Yb have been studied via the 144Sm(16O, 3n) reaction at 16O energy of 90 MeV using techniques of in-beam γ-ray spectroscopy. Measurement of γ-γ-t coincidences was performed with 11 BGO(AC)HPGe detectors. Based on the measured results of γ-γ coincidences, γ-ray anisotropies
and DCO ratios, the level scheme for 157Yb was established. The shape co-existence and structural evolution of the νi
13/2 band with increasing angular momentum in 157Yb have been discussed. The systematics of the νi
13/2 bands in the N = 87 odd-A isotones have been compared.
Received: 7 January 2002 / Accepted: 10 April 2002 |
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| Keywords: | PACS 23 20 Lv Gamma transitions and level energies – 27 70 +q 150 ?A? 189 |
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