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arXiv 1104.4667nucl-th
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基于能量密度泛函的四极集体动力学:集体哈密顿量和相互作用玻色子模型

Quadrupole Collective Dynamics from Energy Density Functionals: Collective Hamiltonian and the Interacting Boson Model

K. Nomura, T. Niksic, T. Otsuka, N. Shimizu, D. Vretenar

摘要:

微观能量密度泛函(EDF)已成为原子核结构计算的标准工具,提供了一个准确的整体描述核基态和集体激发。对于光谱应用,这个框架必须扩展到占集体相关性恢复对称性打破了静态平均场,集体变量的波动。在这项工作中,我们比较了两种方法来五维四极动力学:集体哈密顿四极振动和旋转,和相互作用玻色子模型。这两个模型进行了比较,在Pt同位素的非轴向形状的演变的研究。从$^{192,194,196}$ Pt的结合能表面出发,用微观能量密度泛函计算,分析了从集体哈密顿量得到的低能集体能谱,以及相应的IBM-2哈密顿量.计算的激发光谱和跃迁几率的基态带和$γ$振动带进行比较,相应的序列的实验状态。

英文摘要:

Microscopic energy density functionals (EDF) have become a standard tool for nuclear structure calculations, providing an accurate global description of nuclear ground states and collective excitations. For spectroscopic applications this framework has to be extended to account for collective correlations related to restoration of symmetries broken by the static mean field, and for fluctuations of collective variables. In this work we compare two approaches to five-dimensional quadrupole dynamics: the collective Hamiltonian for quadrupole vibrations and rotations, and the Interacting Boson Model. The two models are compared in a study of the evolution of non-axial shapes in Pt isotopes. Starting from the binding energy surfaces of $^{192,194,196}$Pt, calculated with a microscopic energy density functional, we analyze the resulting low-energy collective spectra obtained from the collective Hamiltonian, and the corresponding IBM-2 Hamiltonian. The calculated excitation spectra and transition probabilities for the ground-state bands and the $γ$-vibration bands are compared to the corresponding sequences of experimental states.

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