Hua( ) 3,2;1) SUN Hui-Bin()XU Chuan( ) 5 WANG Jian-Guo( ) 6 GU Long( ) 6

High-spin states in 126Te have been investigated by using in-beam γ ray spectroscopy with the 124Sn(7Li, 1p4n)126Te reaction at a beam energy of 48 MeV. The previously known level scheme has been enriched, and a new negative-parity sequence has been established. The yrast positive-parity band shows a shape change between triaxial shape and collective oblate shape as a function of spin. In particular, three competitive minima appear in the potential energy surface for the Iπ = 8+ states, with one aligned state at γ = −120° and two triaxial states at γ ∼ 30° and −45°, respectively. The signature splitting behavior of the negative-parity band is discussed. The shape change with increasing angular momentum and the signature splitting can be interpreted well in terms of the Cranked Nilsson-Strutinsky-Bogoliubov and Cranked Nilsson-Strutinsky model calculations.

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High-spin states in 128 I * ZHENG Yun() 1 ZHU Li-Hua( ) 1,2;1) WU Xiao-Guang(DING Huai-Bo( ) 5