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STUDY OF HIGH-SPIN STATES IN EU-150 AND EU-151

机译:EU-150和EU-151中高自旋状态的研究

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摘要

High-spin states in Eu-150,Eu-151 were populated by the Xe-136(F-19, xn)Eu-155-xn reaction. Extensive e gamma-, gamma gamma-measurements led to new level schemes of Eu-150,Eu-151. Most observed excitations are interpreted as quasi-rotational bands built on top of multi-p-h states. Enhanced E1 decays competing with E2 transitions indicate an octupole instability of these nuclei at medium spin. Furthermore, a few negative parity bands of Eu-151 decay through large M1 interband transitions which are interpreted as rotations of a triaxial shape. The observed structures at high spin, especially for Eu-151, show the coexistence of axial and non-axial symmetric shapes. [References: 38]
机译:Xe-136(F-19,xn)Eu-155-xn反应填充了Eu-150,Eu-151中的高自旋态。广泛的伽玛,伽玛伽玛测量导致了Eu-150,Eu-151的新级别方案。大多数观察到的激发被解释为建立在多p-h态之上的准旋转带。与E2跃迁竞争的增强的E1衰变表明这些核在中等自旋下具有八极不稳定性。此外,Eu-151的几个负奇偶校验带会通过较大的M1带间跃迁而衰减,这被解释为三轴形状的旋转。在高自旋下观察到的结构,特别是对于Eu-151,显示出轴向和非轴向对称形状的共存。 [参考:38]

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