Abstract
The high-spin states of Yb-157 have been studied via the reaction of Sm-144(O-16, 3n) at O-16 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 gamma-gamma coincidence relationships and the measured results of gamma-ray anisotropies and DCO ratios, the level scheme for Yb-157 was established. The shape co-existence and structural evolution of the vi(13/2) band with increasing angular momentum in Yb-157 have been discussed. The systematics of the vi(13/2) bands in the N = 87 odd-A isotones,have been compared.
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