发表机构
Petersburg Nuclear Physics Institute named by B.P. Konstantinov of National Research Centre “Kurchatov Institute”; Saint Petersburg State University; KU Leuven, Instituut voor Kern- en Stralingsfysica; Centre for Cold Matter, Imperial College London; State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University（以B.P.康斯坦丁诺夫命名的国家研究中心“库尔恰托夫研究所”圣彼得堡核物理研究所; 圣彼得堡国立大学; 荷语鲁汶大学核与辐射物理研究所; 伦敦帝国理工学院冷物质中心; 清华大学物理系低维量子物理国家重点实验室）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究通过高精度耦合簇计算，从激光光谱数据中提取Ag同位素的核矩、电荷半径和磁化分布参数，并校正了量子电动力学效应和超精细异常。
AI 中文摘要
本文通过高精度电子结构计算，确定了近期在质量数$A=$96-121区域激光光谱研究中推断出的几种银（Ag）同位素的核电矩和均方电荷半径。我们报告了用相对论耦合簇方法（包括单、双、三和微扰四激发，CCSDT(Q)）计算出的超精细结构和同位素位移原子因子。经过系统的理论不确定性分析，我们表明，在目前达到的精度（某些情况下亚百分比不确定性）下，量子电动力学效应变得显著。我们还表明，由于非点状核磁化分布引起的超精细结构中的同位素依赖效应，可以在当前精度水平下以对假设的核磁化模型几乎无关的方式提取。这也产生了经玻尔-魏斯科普夫效应引起的超精细异常校正的核磁偶极矩。在核电四极矩方面，用于从激光光谱中提取四极矩的电场梯度不确定性相对于先前研究中使用的值已减少了一到两个数量级。最后，使用我们耦合簇计算中的场位移和质量位移因子提取Ag同位素的核电荷半径，$^{107,109}$Ag的均方电荷半径差与从μ子X射线光谱推断的值一致。
英文摘要
The nuclear electromagnetic moments and mean-square charge radii of several silver (Ag) isotopes deduced from recent laser spectroscopy studies in the mass region $A=$ 96-121 are determined using high-accuracy electronic structure calculations performed in this work. We report hyperfine structure and isotope-shift atomic factors calculated with the relativistic coupled cluster approach, including single, double, triple, and perturbative quadruple excitations, CCSDT(Q). Following a systematic theoretical uncertainty analysis, we show that at the precision now achieved (sub-percent uncertainties in some cases), quantum electrodynamic effects become significant. We also show that the isotope-dependent effect in the hyperfine structure due to the non-point-like nuclear magnetization distribution can be extracted with negligible dependence on the assumed nuclear magnetization model at the present level of precision. This also yields a nuclear magnetic dipole moment that is corrected for the hyperfine anomaly induced by the Bohr-Weisskopf effect. In terms of the nuclear electric quadrupole moments, the uncertainty in the electric-field gradient used to extract the quadrupole moments from laser spectroscopy has also been reduced by one to two orders of magnitude relative to values used in previous studies. Finally, the nuclear charge radii of Ag isotopes are extracted using field- and mass-shift factors from our coupled cluster calculations, and the difference in mean-square charge radii between $^{107,109}$Ag agrees with the value deduced from muonic X-ray spectroscopy.
