Termination of rotational bands: disappearance of quantum many-body collectivity
Termination of rotational bands: disappearance of quantum many-body collectivity
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DOI：
10.1016/s0370-1573(99)00035-6
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发表时间：
1999-12
期刊：
影响因子：
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通讯作者：
A. Afanasjev;D. Fossan;G. Lane;I. Ragnarsson
中科院分区：
文献类型：
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作者：
A. Afanasjev;D. Fossan;G. Lane;I. Ragnarsson
原子核最有趣的特征之一是特定的组态，表现为中等自旋值的集体转动带，逐渐失去集体性，并在组态内可以建立的最大自旋处终止于非集体状态。最近的进展，在实验和理论允许详细研究这种核结构特征。显示出从高集体到纯粒子-空穴（终止）状态的连续过渡的带通常被称为终止带，或者为了强调其连续性，称为平滑终止带。目前已知的这种带的最好例子是在缺中子的A 110质量区，在那里可以在整个自旋范围内观察到涉及Z=50间隙的质子粒子-空穴激发的终止配置。基于组态相关的Cranked Nilsson-Strutinsky方法，综述了有限多费米子强相互作用系统中带终止作为一种特殊的高自旋现象的主要特征.通过这些理论计算，得到了A_（110）质量区光滑终止带的大量实验结果，并沿着进行了系统的理论比较。此外，在周期表的其他部分和其他可能的理论方法带终止的具体功能进行了简要的审查。
One of the most interesting features of nuclei is the process by which specific configurations, manifest as collective rotational bands at intermediate spin values, gradually lose their collectivity and terminate in a non-collective state at the maximum spin which can be built within the configuration. Recent advances in both experiment and theory allow the study of this nuclear structure feature in detail. The bands, which show such a continuous transition from high collectivity to a pure particle–hole (terminating) state, are generally called terminating bands or to underline their continuous character, smooth terminating bands. The best examples of such bands known at present are in the neutron-deficient A∼110 mass region, where terminating configurations involving proton particle–hole excitations across the Z=50 gap can be observed over their entire spin range. The main features of band termination as a specific high-spin phenomenon inherent to finite many-fermion strongly interacting systems are overviewed, based mainly on the configuration-dependent cranked Nilsson–Strutinsky approach. The extensive experimental results on smooth terminating bands in the A∼110 mass region, which have been addressed by these theoretical calculations, are presented along with the theoretical comparisons in a systematic way. In addition, specific features of band termination in other parts of the periodic chart and other possible theoretical approaches are briefly reviewed.