Rostock 2019 – scientific programme
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A: Fachverband Atomphysik
A 35: Precision Spectroscopy of atoms and ions
A 35.9: Poster
Thursday, March 14, 2019, 16:15–18:15, S Fobau Physik
First Measurement Results of the Alphatrap g-factor Experiment — •Bingsheng Tu1, Ioanna Arapoglou1, José Ramon Crespo López-Urrutia1, Alexander Egl1, Martin Höcker1, Tim Sailer1, Timo Steinsberger1,2, Andreas Weigel1, Robert Wolf1, Sven Sturm1, and Klaus Blaum1 — 1Max-Planck-Institut für Kernphysik, 69117 Heidelberg — 2Fakultät für Physik und Astronomie, Universität Heidelberg, 69120 Heidelberg
The Alphatrap experiment, situated at the Max Planck Institute for Nuclear Physics in Heidelberg, aims for stringent tests of Bound-State Quantum Electrodynamics (BS-QED) in extremely strong electromagnetic fields via high-precision measurements of the magnetic moment (g-factor) of bound electrons in highly charged ions up to hydrogenlike 208Pb81+. Sub-parts-per-billion precision can be achieved in the double Penning-trap setup which consists of cryogenic 7-electrode and 5-electrode cylindrical Penning traps. The highly charged ions are created in three external ion sources: the Heidelberg EBIT, the room-temperature HC-EBIT and the laser ion source, each for different experimental motivations. Boronlike 40Ar13+ has already been produced and captured in the Alphatrap setup. Furthermore, a first g-factor measurement with a relative uncertainty in the 10−9 range has been performed on this system, which exceeds the current calculations by two orders of magnitude. Based on the spin-state detection, laser spectroscopy of the fine structure of boronlike 40Ar13+ has also been implemented by using a novel technique to detect forbidden transitions. The present status and the future plans of ALPHATRAP will be presented.