SAMOP 2021 – scientific programme
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A: Fachverband Atomphysik
A 15: Precision spectroscopy of atoms and ions / Highly charge ions (joint session A/Q)
A 15.3: Invited Talk
Wednesday, September 22, 2021, 15:00–15:30, H1
Coupled ions in a Penning trap for ultra-precise g-factor differences — •Tim Sailer1, Vincent Debierre1, Zoltán Harman1, Fabian Heiße1, Charlotte König1, Jonathan Morgner1, Bingsheng Tu1, Andrey Volotka2, Christoph H. Keitel1, Klaus Blaum1, and Sven Sturm1 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 2Department of Physics and Engineering, ITMO University, St. Petersburg, Russia
Measurements of the electronic magnetic moment (or g factor) of highly charged ions (HCI) in Penning traps have been shown to provide a stringent probe for quantum electrodynamics (QED) in the strongest electromagnetic fields. The isotope shift additionally allows the study of nuclear parameters since many of the common contributions and their uncertainties to the g factor are identical and do not have to be considered. Such measurements become however quickly limited by other factors, for example inherent magnetic field fluctuations. Here, we report on a novel measurement technique based on coupling two ions on a common magnetron orbit to exploit the near-perfect correlation of such magnetic field fluctuations. This has enabled us to directly measure the difference for the isotopes of 20Ne9+ and 22Ne9+ to 0.25 parts-per-trillion precision relative to the g factors, which corresponds to an improvement of more than two orders of magnitude compared to conventional techniques. This resolves and verifies a QED contribution to the nuclear recoil for the very first time, while the observed agreement with theory also allows to strengthen the constraints for a potential fifth-force of Higgs-portal-type dark matter interaction.