SAMOP 2023 – wissenschaftliches Programm
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SYHC: Symposium Precision Physics with Highly Charged Ions
SYHC 1: Highly Charged Ions for Atomic, Nuclear and Astrophysics
SYHC 1.2: Hauptvortrag
Montag, 6. März 2023, 11:30–12:00, E415
Testing quantum electrodynamics in the simplest and heaviest multi-electronic atoms — •Martino Trassinelli for the SPARC collaboration — CNRS, Institut des NanoSciences de Paris, Paris, France
Transition energy measurements in heavy, few-electron atoms allow to test bound-state QED in extremely high Coulomb fields, which enhance the impact of the quantum vacuum fluctuations on the atomic energies. Up to now, experiments have been unable to achieve sensitivity to higher-order QED effects in extremely strong fields. Here we present a novel multi-reference method based on Doppler-tuned x-ray emission from stored Uranium ions with different charge states. By performing high-accuracy x-ray spectroscopy of two, three, and four electron uranium ions in the same measurement campaign, we could obtain the absolute energy of the 1s1/22p3/2 → 1s1/22s1/2 transition with an accuracy of 0.17 eV, a factor of six improvement over previous measurement. This allows to be sensitive to two-loop quantum electrodynamics effects in heavy highly charged ions. Furthermore, by comparing the transition energy in helium-like uranium transition to similar transitions in lithium-like and beryllium-like uranium, the contribution of electron-electron interaction, i.e. two-electron QED, in heavy bound systems could be disentangled from the one-electron QED contributions and from the uncertainty related to the nuclear radius. This result excludes a number of the most-accurate state-of-the-art theoretical predictions and represents a new paradigm for precision tests of bound-state QED.