Erlangen 2022 – scientific programme
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A: Fachverband Atomphysik
A 20: Precision spectroscopy of atoms and ions (joint session A/Q)
A 20.9: Poster
Wednesday, March 16, 2022, 16:30–18:30, P
Most Precise g-Factor Comparison at Alphatrap — •Tim Sailer1, Vincent Debierre1, Zoltán Harman1, Fabian Heiße1, Charlotte König1, Jonathan Morgner1, Bingsheng Tu4, Andrey Volotka2,3, Christoph H. Keitel1, Klaus Blaum1, and Sven Sturm1 — 1Max-Planck-Institut für Kernphysik, Heidelberg — 2Helmholtz-Institut Jena, Jena — 3Department of Physics and Engineering, ITMO University, St. Petersburg, Russia — 4Institute of Modern Physics, Fudan University, Shanghai, China
The Alphatrap experiment is a cryogenic Penning-trap setup, designed to measure the g factor of the bound electron of heavy highly-charged ions (HCI) to provide tests of fundamental physics in strong fields. Recently, a novel measurement technique based on the coupling of ions as an ion crystal has been developed and applied to measure the most precise g-factor difference to date. By coupling two neon ions, 20Ne9+ and 22Ne9+, in a magnetron crystal, a coherent measurement of the Larmor frequency difference of the respective bound electrons becomes possible. The strong suppression of magnetic field fluctuations due to the close proximity of the ions results in a common behaviour of the electron spin states. This allows a determination of the isotopic shift of the g factor to an unprecedented precision of 5.6× 10−13 relative to the absolute g factors, and, in combination with theory, resolves and confirms the QED contribution to the nuclear recoil for the first time. Alternatively, the result can be applied to improve upon the precision of the charge radius difference of the isotopes or to apply constraints on a potential fifth force in the Higgs portal mechanism.