Hannover 2013 – wissenschaftliches Programm

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SYAD: Symposium SAMOP Dissertation-Prize 2013

SYAD 1: SAMOP Dissertation-Prize 2013

SYAD 1.3: Hauptvortrag

Mittwoch, 20. März 2013, 12:00–12:30, E 415

The Standard Model under Extreme Conditions: The g-Factor of Highly Charged Ions — •Sven Sturm — Max-Planck Institute for Nuclear Research, Heidelberg, Germany

A single electron, bound to a heavy nucleus, is exposed to electric fields of up to 10¹⁶ V /cm, the strongest fields obtainable in the laboratory. We have addressed the question whether fundamental symmetries and interactions, described by Quantum Electrodynamics (QED), are still valid under these conditions. To this end, we have developed a Penning trap system that allowed us to store a single, hydrogenlike ²⁸Si¹³⁺ ion for several months at an extremely low restgas pressure of 10⁻¹⁶ mbar and determine its magnetic moment with an unprecedented relative accuracy of a few parts in 10¹⁰. The comparison of the hereby determined value of the g-factor of the bound electron with the similarly precise prediction of theory yielded the most stringent test of QED in strong fields, probing for the first time higher-order contributions to the two-loop QED of bound states. Beyond that, the development of a novel, phase-sensitive detection method for the eigenfrequencies of the ion has enabled a breakthrough in the attainable precision of Penning trap experiments and allowed a further improvement of the precision of the g-factor measurement by an order of magnitude to a few parts in 10¹¹. The developed method paves the way towards a determination of fundamental constants as e.g. the mass of the electron, with unrivaled precision.