Rostock 2019 – scientific programme
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A: Fachverband Atomphysik
A 14: Precision Spectroscopy of atoms and ions IV
A 14.4: Talk
Wednesday, March 13, 2019, 11:15–11:30, S HS 2 Physik
g-factor Measurement of Boronlike 40Ar13+ at Alphatrap — •Bingsheng Tu1, Ioanna Arapoglou1, 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 is a Penning-trap setup to perform high-precision g-factor measurement on highly charged ions (HCI) up to hydrogenlike 208Pb81+. By determining the bound eletron’s g-factor, the most stringent test of Bound-State Quantum Electrodynamics (BS-QED) in the strong field can be carried out. Furthermore, Alphatrap can provide access to fundamental constants, such as the fine-structure constant α or the electron’s atomic mass. The first measurement campaign of Alphatrap has been dedicated to the determination of the ground-state g-factor of a single boronlike 40Ar13+. Using non-destructive detection techniques for the stored ion’s motion, the cyclotron as well as the Larmor frequency can be determined, allowing for a parts per billion precision measurement of the g-factor. Prominent systematic effects in predecessor experiments are highly suppressed in our optimised setup. The leading systematic effect during this measurement is the axial frequency drift, caused by the slow thermalisation of the voltage source. In this contribution the Alphatrap status, its results on 40Ar13+ as well as the future perspectives will be presented.