The yrast band in 166 Ta at high-spin states is established for the first time through the 141 Pr( 28 Si,3n) 166 Ta reaction at a beam energy of 127 MeV. Excitation function, residual radioactivity, and x-γ , γ -γ coincidences were measured. Signature inversion features of 166 Ta and neighbouring isotones are discussed.

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Collective Behavior of Negative Parity States in "'Ba at High Spin * LI Guang-sheng($r&), DAI Zheng-yu($&aF), LIU Xiang-an(AlJ#g), ZHANG Lan-kuan(?&S%), WEN S h u -x i a n ( g 3 g), WU Xiao-guang(g@%), YUAN Guan-jun("aR@), WENG Pei-kun($jfe,&), LI Sheng-gang(%& g), YANG Chun-xiang(&%#)