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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Nuclear chirality, a model and the data
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Nuclear chirality, a model and the data

机译：核手术，模型和数据

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In the last decade, the manifestation of chirality in atomic nuclei has become the subject of numerous experimental and theoretical studies. The common feature of current model calculations is that the chiral geometry of angular momentum coupling is extracted from expectation values of orientation operators, rather than being a starting point in construction of a model. However, using the particle-hole coupling model for triaxial odd-odd nuclei it is possible to construct a basis which contains right-handed, left-handed and planar states of angular momentum coupling. If this basis is used, the chirality is an explicit rather than an extracted feature as in any other models with non-chiral bases. The time-reversal symmetry, which relates the basis states of opposite handedness, can be used to reduce the dimension of matrices for diagonalization of the model Hamiltonian, proving the effectiveness of this approach. Moreover, the final model eigenstate wave functions show a concentration of amplitudes among a relatively small number (similar to 1%) of components compared to the full model space. In that sense, the 'chiral' basis provides a useful tool to examine model predictions providing direct insight into the structure of doublet states. In this work, similarities and differences between the rotational behaviour of an axial and triaxial body provide a starting point for derivation of the basis optimal for valence nucleon coupling to an axial and a triaxial core. The derived 'chiral' basis is optimal for coupling of a valence particle and hole to the triaxial core. Model predictions are presented and discussed. A comprehensive review of current experimental data on observed chiral band candidates is also provided.
机译：在过去的十年里，原子核中手性的表现已经成为许多实验和理论研究的主题。当前模型计算的共同特点是，角动量耦合的手征几何是从方向算子的期望值中提取的，而不是作为构建模型的起点。然而，使用三轴奇数核的粒子-空穴耦合模型，可以构造一个包含角动量耦合的右手态、左手态和平面态的基。如果使用这个基，手性是一个显式的特征，而不是像任何其他具有非手性基的模型那样是一个提取的特征。时间反转对称性与反利手的基态有关，可以用来降低模型哈密顿量对角化矩阵的维数，证明了该方法的有效性。此外，与整个模型空间相比，最终模型的本征态波函数显示，振幅集中在相对较少（类似于1%）的分量中。从这个意义上说，“手征”基础为检验模型预测提供了一个有用的工具，可以直接洞察双态的结构。在这项工作中，轴向和三轴体的旋转行为之间的相似性和差异为推导价核子与轴向和三轴核耦合的最佳基提供了起点。导出的“手性”基对于价粒子和空穴与三轴核的耦合是最佳的。提出并讨论了模型预测。本文还对现有的实验数据进行了综合评述。

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