Mainz 2026 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 42: Atomic Systems in External Fields II

A 42.4: Vortrag

Freitag, 6. März 2026, 11:45–12:00, N 3

Towards improvement of the antiproton magnetic moment with phase-sensitive high-fidelity spin spectroscopy — •Bela Peter Arndt for the BASE collaboration — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117, Heidelberg, Germany — GSI-Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, D-64291 Darmstadt, Germany

The BASE collaboration is dedicated to the development and application of advanced Penning-trap setups as well as cryogenic superconducting detection systems with single-particle resolution. These methods enable stringent tests of CPT invariance through high-precision measurements on protons and antiprotons. Notable results include the antiproton and proton charge-to-mass ratio with a fractional precision of 16 parts per trillion (ppt), as well as the antiproton g-factor with a fractional precision of 1.5 parts per billion (ppb). This presentation will address challenges associated with spin-state detection in g-factor measurements and will summarize the recent improvements implemented and characterized within the BASE experiment. Particular emphasis will be placed on phase-sensitive frequency-measurement techniques and improved particle cooling, both of which enable new experimental approaches that facilitate sub-100-ppt precision and thus more than a 10-fold improvement in the determination of the antiproton and proton g-factors.

Keywords: Antimatter; Penning Trap; Spin Determination; Phase-sensitive Detection; Precision Measurements