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Observation of signature partner bands in Sb-117

机译:观察SB-117中的签名合作伙伴乐队

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Rotational band structures and low-lying single-particle levels in Sb-117 have been populated using reaction In-115(alpha, 2n) Sb-117 at a beam energy of 28 MeV and investigated using gamma-ray spectroscopic techniques. The existing level scheme has been extended with the observation of 31 new transitions. The signature partner of the band structure based on the configuration of pi g(7/2) circle times 2p-2h of the Sn-116 core has been established in Sb-117 for the first time. Several single-particle nonyrast transitions connecting to various band structures have also been identified. Measurements of the DCO ratios, polarization asymmetry and angular distribution of the observed gamma rays have been carried out to assign the spin-parities to the levels of all the band structures and the low-lying single-particle states, populated in the present work. The spin-parities are also determined for the states of the two previously unassigned bands. The lower-spin structures have been interpreted on the basis of large-scale shell-model calculations using OXBASH. Particle Rotor Model (PRM) calculations have been carried out to explain the large signature splitting of the observed signature partner bands.
机译:SB-117中的旋转带结构和低位单颗粒水平在28meV的光束能量下使用反应在-115(α,2N)SB-117中填充并使用γ射线光谱技术研究。现有级别方案已延长31项新转型。第一次在SB-117中建立了基于SN-116核心的PI G(7/2)圆时2p-2h的配置的频带结构的签名伙伴。还识别了连接到各种带结构的几种单粒子壬酯转换。已经进行了DCO比率,观察到的伽马射线的偏振不对称性和角度分布,以将旋转接近分配到本作工作中填充的所有带结构和低位单粒子状态的旋转间隔。还确定了两个先前未分配的频带的状态。在使用Oxbash的大规模壳模型计算的基础上解释了较低旋转结构。已经进行了粒子转子模型(PRM)计算,以解释观察到的签名伙伴乐队的大签名分裂。

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