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arXiv 1010.1801nucl-th
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协变密度泛函理论中的时奇平均场:旋转系统

Time-odd mean fields in covariant density functional theory: Rotating systems

A. V. Afanasjev, H. Abusara

摘要:

在协变密度泛函理论(CDFT)框架下研究了旋转核中的奇时平均场(核磁)及其对物理观测量的影响。结果表明,它们对动力学和运动学转动惯量有着深刻的影响。系统地分析了粒子数目、结构和转动频率对转动惯量的影响。核磁还可以显著地改变带交叉特征,例如交叉频率以及带交叉区域中的运动学和动力学惯性矩的性质。时间奇平均场对远离带交叉区域的转动惯量的影响仅弱依赖于相对论平均场参数化,反映了CDFT中时间奇平均场性质的良好局部化。正常形变核的转动惯量与刚体值有很大的偏差。而超形变核和超形变核的转动惯量接近于刚体的转动惯量。本文系统地分析了旋转坐标系中电流的结构、微观成因及其与转动惯量的关系。本文详细分析了时间奇平均场引起的奇-奇核信号分离现象。

英文摘要:

Time-odd mean fields (nuclear magnetism) and their impact on physical observables in rotating nuclei are studied in the framework of covariant density functional theory (CDFT). It is shown that they have profound effect on the dynamic and kinematic moments of inertia. Particle number, configuration and rotational frequency dependences of their impact on the moments of inertia have been analysed in a systematic way. Nuclear magnetism can also considerably modify the band crossing features such as crossing frequencies and the properties of the kinematic and dynamic moments of inertia in the band crossing region. The impact of time-odd mean fields on the moments of inertia in the regions away from band crossing only weakly depends on the relativistic mean field parametrization, reflecting good localization of the properties of time-odd mean fields in CDFT. The moments of inertia of normal-deformed nuclei considerably deviate from the rigid body value. On the contrary, superdeformed and hyperdeformed nuclei have the moments of inertia which are close to rigid body value. The structure of the currents in rotating frame, their microscopic origin and the relations to the moments of inertia have been systematically analysed. The phenomenon of signature separation in odd-odd nuclei, induced by time-odd mean fields, has been analysed in detail.

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