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Doublet bands in ~(128)La and systematic features of energy separationof doublet bands observed in the A~130 mass region

马克岩  陆景彬  杨东  王辉东  刘运祚  李剑  刘弓冶  李黎  马英君  吴晓光  李广生  郑云  贺创业  
【摘要】:High spin states of 128La have been studied through the fusion-evaporation reaction 118Sn(14N,4n) 128La at a beam energy of 69 MeV. A positive-parity side band with the same configuration as that of the yrast band has been identified. Moreover, it is noted that the energy separation △E(I) = E(I)side-E(I)yrast of all doublet bands reported in odd-odd nuclei in the A~130 mass region exhibit a staggering pattern systematically, and they stagger up at even-spin and stagger down at odd-spin.

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