2019 Impact factor 2.176
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.

PACS
23.20.Lv - Gamma transitions and level energies.
27.70.+q - $150\leq A \leq 189$ .

© Società Italiana di Fisica, Springer-Verlag 2002