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Structure Of The Neutron-Rich Cr Isotopes: Inadequacy Of The fp Model Space And Onset Of Deformation

机译:富含中子CR同位素的结构:FP模型空间的不足和变形的发作

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The low-lying levels in 59,60Cr have been populated with 13,14C(48Ca, 2p) reactions using a beam energy of 130 MeV. Prompt electromagnetic radiation was detected using the Gammasphere array, in coincidence with the detection of recoiling ions performed with the Fragment Mass Analyzer and a gas-filled ion chamber. The residues of interest were selected and identified on the basis of charge-to-mass ratio, energy-loss and time-of-flight measurements. These methods have isolated rays from the 2p evaporation channel for the first time. The low-lying structure of 59Cr is clearly inconsistent with the results of shell-model calculations within the full fp shell model and requires the inclusion of the g9/2 orbital. The sequence of states can be understood within the Nilsson model assuming a moderate oblate ground-state deformation. Preliminary results for 60Cr are discussed in terms of the development of deformation in the region. None of the low-lying structures observed so far exhibit a clear indication for a well-developed oblate shape.
机译:使用130meV的光束能量填充59,60cc(48CA,2P)反应的59,60CC中的低位水平。使用伽马射阵阵列检测促进电磁辐射,与用片段质量分析仪和填充气体离子室进行的重塑离子的检测相吻合。根据电荷对质量比,能量损失和飞行时间测量选择兴趣的残留物。这些方法首次来自2P蒸发通道的隔离射线。 59Cr的低位结构与全FP壳模型内的壳模型计算结果显然不一致,并且需要包含G9 / 2轨道。假设适度的扁平地面变形,可以在Nilsson模型中理解各种状态。 60Cr的初步结果是在该地区变形的发展方面讨论的。到目前为止观察到的低位结构都没有表现出良好发育良好的扁平形状的清晰指示。

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