^(188)Tl的πh_(9／2)vi_(13／2)扁椭球转动带的旋称反转研究

Signature Inversion in πh_(9/2)vi_(13/2) Oblate Band of ^(188)Tl

利用能量为170MeV的35Cl束流,通过157Gd(35Cl,4n)熔合蒸发反应研究了188Tl的高自旋态能级结构．依据实验结果建立了188Tl基于πh9／2(?)vi13／2组态的转动带．根据双奇Tl核能级结构的相似性,指定了188Tlπh9／2(?)vi13／2扁椭球转动带的自旋值．结果表明在188Tl中,πh9／2(?)vi13／2扁椭球转动带在低自旋区具有旋称反转性质．利用包含了质子-中子剩余相互作用的准粒子-转子模型,定性地解释了πh9／2(?)vi13／2扁椭球转动带的低自旋区旋称反转现象．

High-spin Level structure of lSST1 has been studied via ^187TGd（^35Cl,4n） fusion-evaporation reaction at beam energy of 170MeV. A rotational band built on the πh9/2×νi13/2 configuration with oblate deformation has been established. Spin values have been proposed to the πh9/2×νi13/2 oblate band based on the similarities between the oblate band of ^188Tl and those in odd-odd ^190-200Tl. With the spin assignments, the low-spin signature inversion has been revealed for the πh9/2×νi13/2 oblate band of ^188Tl. The low-spin signature inversion can be interpreted qualitatively in the framework of the quasi-particles plus rotor model including a J dependent p-n residual interaction.