Freiburg 2024 – scientific programme
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A: Fachverband Atomphysik
A 33: Poster VI
A 33.19: Poster
Thursday, March 14, 2024, 17:00–19:00, Tent A
Tests of QED and determination of nuclear parameters with the hydrogenlike beryllium-9 ion — •Bastian Sikora, Vladimir A. Yerokhin, Zoltan Harman, and Christoph H. Keitel — Max Planck Institute for Nuclear Physics, Heidelberg, Germany
In an external magnetic field, the ground state of the 9Be3+ ion is split into multiple sublevels due to hyperfine and Zeeman effect. The bound electron’s g-factor, the ground-state hyperfine splitting as well as the shielded magnetic moment of the nucleus can be determined by measurements of transition frequencies between these sublevels [1].
We present theoretical calculations of the nuclear shielding constant, the ground-state hyperfine splitting and the bound-electron g-factor [2]. The nuclear shielding constant is used to extract the magnetic moment of the bare nucleus with unprecedented precision, enabling a first test of multi-electron shielding calculations performed for the lithiumlike 9Be+ ion. Furthermore, we improve the accuracy of the effective nuclear Zemach radius using the theory of hyperfine splitting. We also present the contributions of muonic and hadronic vacuum polarization to hyperfine splitting, calculated for different nuclear models [3]. We also study a weighted difference of hyperfine splittings of the hydrogenlike and ithiumlike Be ions which is found to be in excellent agreement with experimental results.
[1] A. Schneider, B. Sikora, S. Dickopf, et al., Nature 606, 878 (2022)
[2] S. Dickopf, B. Sikora, et al., in preparation
[3] J. Heiland and B. Sikora, in preparation
Keywords: QED tests; Hyperfine splitting; Nuclear Zemach radius