Hannover 2016 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 7: Highly charged ions and their applications
A 7.1: Hauptvortrag
Montag, 29. Februar 2016, 14:30–15:00, f107
Probing QED in strong fields via the magnetic moment of highly charged ions — •Sven Sturm — Max-Planck-Institut für Kernphysik Heidelberg
The validity of the Standard Model, particularly Quantum Electrodynamics (QED), has been exquisitely tested by precision experiments in the low-field regime. However, in the presence of strong fields higher-order contributions beyond the Standard Model might become significant. The ultra-precise measurement of the g-factor of highly-charged ions provides a unique possibility to probe the validity of the Standard Model in extreme electric fields up to 1016 V/cm. By measuring the Larmor- and cyclotron frequencies of single highly charged ions in a cryogenic Penning trap with previously unprecedented precision, we have been able to perform the most stringent test of QED in strong fields. Recently, we were able to explicitly probe the effect of the nucleus on the g-factor of the electron and thus open a novel access to nuclear structure information. Currently, a new setup, ALPHATRAP, is being commissioned at the Max-PIanck-Institut für Kernphysik in Heidelberg, which will push these experiments towards the heaviest elements up to hydrogenlike 208Pb81+. This will not only enable the most sensitive tests of QED, but also open a unique access to fundamental constants as the atomic mass of the electron and the finestructure constant α.