International Conference on Precision Physics of Simple Atomic Systems

Session

Session 18

22 May 2026, 11:00

Festsaal, Theatersaal (ÖAW)

47. Sub-part-per-trillion test of the Standard Model with atomic hydrogen

Vitaly Wirthl

22/05/2026, 11:00

Talk

Quantum electrodynamics (QED) forms the basis for all other quantum field theories, upon which the Standard Model (SM) of particle physics is constructed. Because of the hydrogen atom's simplicity, its energy levels can be precisely calculated from bound-state QED and compared with experiment. Such a comparison between theory and experiment is linked to the determination of fundamental...

15. Hyperfine-induced transitions of nuclei and atoms

Stephan Fritzsche (Helmholtz-Institute Jena + GSI Darmstadt)

22/05/2026, 11:30

Talk

The hyperfine interaction between the nuclear moments and electronic charge and current distributions occurs naturally for all atoms and ions with non-zero nuclear spin, $I\neq 0$. While the hyperfine splitting of most ionic levels usually remain (very) small, this coupling of the nuclear and electronic degrees of freedom can significantly modify the lifetime of isomeric and electronic states....

3. Atomic parity violation in highly charged 40,48Ca and 208Pb ions

Dr Anna Viatkina (TU Braunschweig, PTB Braunschweig)

22/05/2026, 11:50

Talk

We calculate parity-violation-induced E1 amplitudes for the $1s\rightarrow 2s$ and $1s^2 2s\rightarrow 1s^2 3s$ transitions in H- and Li-like ions of $^{40}$Ca, $^{48}$Ca, and $^{208}$Pb; neutron skin effects and nuclear uncertainties are included for each nucleus. We consider spin-independent weak-interaction contribution of the $Z^0$ boson described by standard model, as well as the effects...

29. Precision measurement of the ground-state hyperfine constant for ⁹Be⁺ in a linear Paul trap via magnetically insensitive hyperfine transitions

Dr Wencui Peng

22/05/2026, 12:10

Talk

Beryllium ions (9Be+) serve as a four-body system with a closed electronic shell and a single valence electron, offering advantages for both theoretical and experimental research. Theoretically, their energy level structure can be accurately calculated using high-precision quantum electrodynamics (QED) methods. Experimentally, laser cooling enables the preparation of ultracold Coulomb...