Novel ansatz for charge radii in density functional theories

Novel ansatz for charge radii in density functional theories
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密度泛函理论中电荷半径的新颖模拟

DOI:
10.1103/physrevc.102.024307
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发表时间:
2020-04
期刊:
影响因子:
3.1
通讯作者:
Shi-Sheng Zhang
Shi-Sheng Zhang
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Rong An;Li-Sheng Geng;Shi-Sheng Zhang

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电荷半径是原子核表征其电荷分布的最基本性质之一。虽然A1/3规则很好地描述了钙同位素链的演化和相应的奇偶交错等精细结构,但用密度泛函理论和从头算方法都很难描述这些精细结构。在这项工作中,我们提出了一种新的ANSAZ来描述钙同位素的电荷半径,它是在用BCS方法处理配对相互作用的相对论平均场模型中计算的电荷半径中添加一个与库珀对的数目成比例的、由BCS振幅和单个参数确定的修正项来描述的。结果表明,新的ANSAZ结果不仅与钙同位素的数据一致,而且与氧、霓离子、镁、铬、镍、锗、锆、镉、锡和铅等10个其他同位素链的数据一致。值得注意的是,这个单参数的ANSATZ可以描述整个元素周期表中的核电荷半径,特别是奇偶交错和抛物线行为。
Charge radii are one of the most fundamental properties of atomic nuclei characterizing their charge distributions. Though the general trend as a function of the mass number is well described by the A1/3 rule, some fine structure, such as the evolution along the calcium isotopic chain and the corresponding odd-even staggerings, are notoriously difficult to describe both in density functional theories and ab initio methods. In this work, we propose a novel ansatz to describe the charge radii of calcium isotopes by adding a correction term, proportional to the number of Cooper pairs and determined by the BCS amplitudes and a single parameter, to the charge radii calculated in the relativistic mean field model with the pairing interaction treated with the BCS method. It is shown that the new ansatz yields results consistent with data not only for calcium isotopes, but also for 10 other isotopic chains, including oxygen, neon, magnesium, chromium, nickel, germanium, zirconium, cadmium, tin, and lead. It is quite remarkable that this ansatz with a single parameter can describe nuclear charge radii throughout the periodic table, particularly the odd-even staggerings and parabolic behavior.
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