Experimental Validation of QED in Highly Charged Tin Ions through g-Factor MeasurementsHYBRID

Presented is a comprehensive experimental study of the bound-electron g-factors in three charge states of highly charged tin ions – hydrogen-like, lithiumlike, and boronlike - performed using the ALPHATRAP Penning-trap setup. These measurements represent the first high-precision determinations of g-factors in tin ions with atomic number Z = 50, extending the reach of quantum electrodynamics (QED) tests via g factors into a previously unexplored regime of strong nuclear fields. All three g factors were measured with 0.5 parts per billion (ppb) precision. The hydrogenlike measurement provides a stringent test of one-electron QED contributions. Lithiumlike tin enables a sensitive probe of interelectronic interactions. The boronlike tin measurement allows for the study of many-electron dynamics with non-zero orbital angular momentum in extreme fields. All three high-precision measurements are the first in the medium-to-high Z regime, marking a major step for tests of fundamental physics in the heavy ion regime. The experimental results are in good agreement with state-of-the-art ab initio QED calculations. Furthermore, by combining the g factors of different charge states, we demonstrate enhanced tests of QED and the potential for an independent determination of the fine-structure constant.

https://gsi-fair.zoom.us/j/63856816325
Meeting-ID: 638 5681 6325
Passcode: AP_Seminar
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