From superdeformation to extreme deformation and clusterization in the N ≈ Z nuclei of the A ≈ 40 mass region
From superdeformation to extreme deformation and clusterization in the N ≈ Z nuclei of the A ≈ 40 mass region
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DOI：
10.1103/physrevc.94.014310
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发表时间：
2016-06
影响因子：
3.1
通讯作者：
D. Ray;A. Afanasjev
中科院分区：
文献类型：
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作者：
D. Ray;A. Afanasjev
首次在协变密度泛函理论框架下系统地研究了A~40质量区N~Z核中的极端变形结构。在自旋为零时，此类结构位于高激发能下，这阻碍了它们的实验观察。旋转作为一种工具，将这些奇特的形状带到 yrast 线或其附近，以便通过下一代 $\gamma-$tracking（或类似）探测器（例如 GRETA 和 AGATA）对其进行观察成为可能。定义了此类结构的主要物理可观察量（例如转变四极矩以及运动学和动态惯性矩）、底层单粒子结构以及它们变成亚拉斯特或接近亚拉斯特的自旋。进行了聚类和分子结构指纹的搜索，并讨论了具有这些特征的构型。确定了观察极度变形结构的最佳候选者。对于本研究中的几个原子核（例如 $^{36}$Ar），在当前测量的最大自旋 $16\hbar$ 以上添加几个自旋单位将不可避免地触发向超变形和巨变形核形状的转变。
A systematic search for extremely deformed structures in the N~Z nuclei of the A~40 mass region has been performed for the first time in the framework of covariant density functional theory. At spin zero such structures are located at high excitation energies which prevents their experimental observation. The rotation acts as a tool to bring these exotic shapes to the yrast line or its vicinity so that their observation could become possible with future generation of $\gamma-$tracking (or similar) detectors such as GRETA and AGATA. The major physical observables of such structures (such as transition quadrupole moments as well as kinematic and dynamic moments of inertia), the underlying single-particle structure and the spins at which they become yrast or near yrast are defined. The search for the fingerprints of clusterization and molecular structures is performed and the configurations with such features are discussed. The best candidates for observation of extremely deformed structures are identified. For several nuclei in this study (such as $^{36}$Ar), the addition of several spin units above currently measured maximum spin of $16\hbar$ will inevitably trigger the transition to hyper- and megadeformed nuclear shapes.