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SYAM: Symposium Atomic Anti-Matter Physics

SYAM 1: Atomic Anti-Matter Physics I

SYAM 1.5: Vortrag

Donnerstag, 9. März 2017, 12:45–13:00, P 1

The Proton g-Factor Experiment at Mainz — •Georg Schneider^1,2, Matthew Bohman³, Andreas Mooser², Natalie Schön¹, James Harrington³, Takashi Higuchi^2,4, Hiroki Nagahama^2,4, Stefan Sellner², Christian Smorra^2,5, Toya Tanaka^2,4, Klaus Blaum³, Yasuyuki Matsuda⁴, Wolfgang Quint⁶, Jochen Walz^1,7, Yasunori Yamazaki⁸, and Stefan Ulmer² — ¹University of Mainz, Germany — ²RIKEN, Ulmer IRU, Japan — ³MPIK Heidelberg, Germany — ⁴University of Tokyo, Japan — ⁵CERN, Switzerland — ⁶GSI Darmstadt, Germany — ⁷HIM Mainz, Germany — ⁸RIKEN, APL, Japan

In 2014 we measured the g-factor of a single proton in a Penning trap with a relative precision of 3.3 parts per billion. Now we aim to improve the precision even further to a level of 10⁻¹⁰ or better.

The measurement technique makes use of two spatially separated traps, the homogeneous precision trap (PT) to perform high-precision frequency measurements and the analysis trap (AT) with a superimposed magnetic inhomogeneity to detect the spin-state. One of the previous limitations was a residual magnetic field inhomogeneity in the PT caused by the AT. To reduce this systematic effect the distance between the two traps was increased. Furthermore, a self-shielding coil and new detectors were installed. Ultimately, the implementation of these improved techniques at our antiproton experiment BASE at CERN will provide one of the most sensitive tests of the fundamental CPT symmetry in the baryon sector.