Freiburg 2024 – scientific programme

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A: Fachverband Atomphysik

A 36: Highly Charged Ions and their Applications II

A 36.1: Invited Talk

Friday, March 15, 2024, 11:00–11:30, HS 1010

Stringent Test of QED predictions using Highly Charged Tin — •Jonathan Morgner, Bingsheng Tu, Charlotte M. König, Tim Sailer, Fabian Heiße, Bastian Sikora, Chunhai Lyu, Vladimir Yerokhin, Zoltán Harman, José R. Crespo López-Urrutia, Christoph H. Keitel, Sven Sturm, and Klaus Blaum — Max-Planck-Institut für Kernphysik, Heidelberg

Quantum electrodynamics (QED) is one of the pillars of the Standard Model. Its success in describing the fundamental interactions of charged particles, including non-classical effects such as self-energy and vacuum polarisation, is demonstrated in weak fields by the precise measurement of the electron magnetic moment (or g−2) [1]. Testing this in strong fields is of similar importance, as it allows exploring the boundaries of validity of the theory.

Here we present our recent measurement of the bound-electron magnetic moment of hydrogen-like tin [2]. The highly charged ions are produced in an electron beam ion trap and ejected into the Alphatrap apparatus, where we store a few single ions for months to perform high-precision Penning-trap spectroscopy on them. A comparison with the ab initio theory prediction shows agreement, and is therefore a precise test of the underlying theory at the highest Z so far. We additionally present measurements and first results of the lithium-like and the boron-like tin system [3].
[1] X. Fan, et al., PRL 130, 071801 (2023),
[2] J. Morgner, et al., Nature 622, 53*57 (2023),
[3] J. Morgner, et al., in preparation.

Keywords: quantum electrodynamics; Highly charged ion; Penning trap spectroscropy; Hydrogen-like; High-precision measurement