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arXiv 1603.03414nucl-th
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偶偶核基态八极形变的协变密度泛函理论整体分析

Octupole deformation in the ground states of even-even nuclei: a global analysis within the covariant density functional theory

S. E. Agbemava, A. V. Afanasjev, P. Ring

摘要:

本文系统地研究了$Z\leq 106$位于双质子滴线和双中子滴线之间的偶-偶系统的八极形变核。在这项研究中,我们使用五个最新的协变能量密度泛函的不同类型,与非线性介子耦合,与密度相关的介子耦合,与密度相关的零程相互作用。基于有限程有效可分的粒子-粒子相互作用,在相对论Hartree-Bogoliubov(RHB)理论中处理配对关联。这使我们能够评估理论的不确定性,在目前的协变模型预测的物理观测相关的八极形变核。此外,与非相对论模型的预测进行了详细的比较。首次预测了以$Z\sim 98, N\sim 196$为中心的新的八极形变区。就其在$(Z,N)$平面中的大小和八极形变对结合能的影响而言,该区域类似于以$Z\sim 90, N\sim 136$为中心的八极形变核的最佳已知区域。对于后来的八极形变核岛,计算结果表明,它的大小与现有的实验数据相比,有很大的增加。

英文摘要:

A systematic investigation of octupole deformed nuclei is presented for even-even systems with $Z\leq 106$ located between the two-proton and two-neutron drip lines. For this study we use five most up-to-date covariant energy density functionals of different types, with a non-linear meson coupling, with density dependent meson couplings, and with density-dependent zero-range interactions. Pairing correlations are treated within relativistic Hartree-Bogoliubov (RHB) theory based on an effective separable particle-particle interaction of finite range. This allows us to assess theoretical uncertainties within the present covariant models for the prediction of physical observables relevant for octupole deformed nuclei. In addition, a detailed comparison with the predictions of non-relativistic models is performed. A new region of octupole deformation, centered around $Z\sim 98, N\sim 196$ is predicted for the first time. In terms of its size in the $(Z,N)$ plane and the impact of octupole deformation on binding energies this region is similar to the best known region of octupole deformed nuclei centered at $Z\sim 90, N\sim 136$. For the later island of octupole deformed nuclei, the calculations suggest substantial increase of its size as compared with available experimental data.

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