Freiburg 2024 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 15: Poster I
A 15.26: Poster
Dienstag, 12. März 2024, 17:00–19:00, Tent A
Measurements of the Bound Electron g-factor at ALPHATRAP — •Matthew Bohman1, Athulya George1, Fabian Heiße1, Charlotte König1, Jonathan Morgner1, Tim Sailer1, Kunal Singh1, Bingsheng Tu1,2, Klaus Blaum1, and Sven Sturm1 — 1Max-Planck-Institut für Kernphysik, 69117 Heidelberg — 2Institute for Modern Physics, Fudan University, Shanghai 200433
ALPHATRAP [1] is a precision Penning-trap apparatus for high-precision measurements on simple atomic systems. Image current detection enables measurement of the motional frequencies of single particles and, when combined with the Larmor frequency, we extract fundamental properties such as bound-state magnetic moments with high precision. Recent measurements of the bound electron magnetic moment in H-like, Li-like, and B-like tin, for example, tested quantum electrodynamics (QED) at extremely high fields with sub-ppb accuracy [2]. Similarly, we developed a technique to measure direct g-factor differences of co-trapped particles at even higher precision. In a measurement with 20,22Ne9+, the difference of the two bound electron g-factors was measured to sub-ppt accuracy and set competitive bounds on scalar dark matter candidates [3]. We recently upgraded the apparatus and are building a new electron beam ion trap (EBIT) to produce ions at higher charge states, including H-like lead - testing QED and the Standard Model at even more extreme fields.
[1] Sturm, S. et al. Eur. Phys. J. Spec. Top. 227, 14251491 (2019).
[2] Morgner, J., Tu, B., König, C.M. et al. Nature 622, 5357 (2023).
[3] Sailer, T., Debierre, V. et al. Nature 606, 479483 (2022).
Keywords: Highly charged ions; Penning traps; g-factors; QED; precision measurments