2023/09/01 by Krzysztof Pachucki, Pachucki, Krzysztof, Vojtěch Patkóš +3 · 1 citation
Engineering · Physics and Astronomy · #Atomic Physics (physics.atom-ph) #Atomic and Molecular Physics #FOS: Physical sciences #Nuclear physics research studies #Particle accelerators and beam dynamics
paper · pdf · doi:10.48550/arxiv.2309.00436
openalex publication_date 2023/09/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present a detailed derivation of the QED effects of order α7 m to the hyperfine structure (hfs) of the 3S states of helium-like ions and perform numerical calculations for 6Li+ and 7Li+. By comparing the theoretical point-nucleus results with the measured hfs of Li+, we determine the nuclear-structure contribution parameterized in terms of the effective Zemach radius. Using the experimental hfs results for Li+, we obtain accurate predictions for the hfs of 6Li2+ and 7Li2+, for which no experimental data is available so far. By examining the normalized differences of the hfs of Li+ and Li and of the corresponding isotope-shift differences, we test the consistency of the hfs measurements in 6,7Li+ and 6,7Li.