Exploring wobbling motion in triaxial even-even nuclei

IF 4.3 2区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Physics Letters B Pub Date : 2024-11-13 DOI:10.1016/j.physletb.2024.139131

Y.M. Wang, Q.B. Chen

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Abstract

The potential presence of wobbling motions in even-even nuclei ¹¹²Ru, ¹¹⁴Pd, ¹⁵⁰Nd, and ¹⁸⁸Os are explored by the five-dimensional collective Hamiltonian based on the relativistic density functional theory (5DCH-RDFT). The theoretical results successfully reproduce experimental energy spectra and electromagnetic transition probabilities. Analyses of the potential energy surfaces and probability density distributions in the

(β, γ)

deformation plane as well as the quadrupole asymmetry parameter

〈 \cos 3 δ 〉

reveal that ¹⁵⁰Nd shows near-axial symmetry in contrast to the triaxial deformation in ¹¹²Ru, ¹¹⁴Pd, and ¹⁸⁸Os. Additionally, spin coherent state (SCS) map is introduced for the first time to the 5DCH framework to visualize the geometry of angular momentum. It is revealed that the wobbling mode, characterized by oscillations of total angular momentum J about the medium axis, is present in ¹¹²Ru but absent in ¹⁵⁰Nd.

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探索三轴偶偶核中的摇摆运动

基于相对论密度泛函理论（5DCH-RDFT）的五维集合哈密顿探索了偶偶核 112Ru、114Pd、150Nd 和 188Os 中可能存在的摆动运动。理论结果成功地再现了实验能谱和电磁转变概率。对（β,γ）形变平面上的势能面和概率密度分布以及四极不对称参数〈cos3δ〉的分析表明，与 112Ru、114Pd 和 188Os 的三轴形变相反，150Nd 显示出近轴对称性。此外，5DCH 框架首次引入了自旋相干态（SCS）图，以直观地显示角动量的几何形状。研究发现，112Ru 中存在摆动模式，而 150Nd 中则不存在，摆动模式的特征是总角动量 J 围绕介质轴摆动。

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来源期刊

Physics Letters B 物理-物理：综合

CiteScore

9.10

自引率

6.80%

发文量

647

审稿时长

3 months

期刊介绍： Physics Letters B ensures the rapid publication of important new results in particle physics, nuclear physics and cosmology. Specialized editors are responsible for contributions in experimental nuclear physics, theoretical nuclear physics, experimental high-energy physics, theoretical high-energy physics, and astrophysics.