Hyperfine structure and g factor in heavy ions: test of QED in strong fields

重离子中的超精细结构和 g 因子：强场中 QED 的测试

• 批准号: 169785323
• 负责人: Privatdozent Dr. Andrey V. Volotka
• 金额: --
• 依托单位: Theoretisch-Physikalisches Institut
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/169785323?language=en
• 关键词: Hyperfine; structure; factor; heavy; ions

The current project is devoted to developments of the ab initio quantum-electrodynamical (QED) approach for the evaluation of the hyperfine splitting and the bound-electron g factor of Li- and B-like ions. In the first phase of this project the contributions of the most difficult many-electron QED Feynman diagrams - the screened radiative and two-photon exchange corrections - were rigorously evaluated for Li-like ions. In the second phase the theoretical accuracy of the g factor of Li-like ions was further substantially increased, and, moreover, the nuclear-polarization and screened nuclear polarization corrections were evaluated for H-, Li-, and B-like ions. It was shown, that the nuclear polarization contributions can be substantially canceled simultaneously with the rigid nuclear corrections. This allows for new prospects for probing the QED effects in strong electromagnetic field and the determination of fundamental constants.Within the next stage we plan to improve further the theoretical accuracy of the g factor of Li-ike ions and to extend the rigorous calculations of the two-photon exchange and screened QED diagrams to the hyperfine splitting and the g factor of B-like ions. As a result, these investigations will widen the theoretical basis for the stringent tests of the magnetic sector of bound-state QED at strongest electromagnetic field.

目前的项目是致力于从头计算量子电动力学（QED）方法的发展，用于评估超精细分裂和束缚电子g因子的锂和B类离子。在这个项目的第一阶段，最困难的多电子QED费曼图的贡献-屏蔽辐射和双光子交换校正-严格评估锂离子。在第二阶段的理论精度的g因子的锂离子进一步大幅增加，而且，此外，核极化和屏蔽核极化校正进行了评估的H-，Li-和B-类离子。结果表明，核极化的贡献可以在刚性核修正的同时基本上被抵消。在下一阶段，我们计划进一步提高类锂离子g因子的理论精度，并将双光子交换图和屏蔽QED图的严格计算推广到类硼离子的超精细分裂和g因子。这些研究将为在最强电磁场下严格检验束缚态QED磁扇区提供理论基础。