Erlangen 2018 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 9: Precision Spectrosocopy II - trapped ions (joint session A/Q)
A 9.1: Hauptvortrag
Montag, 5. März 2018, 14:00–14:30, K 1.016
A ppb measurement of the antiproton magnetic moment — •C. Smorra1, S. Sellner1, M. Borchert1,2, J. A. Harrington3, T. Higuchi1,4, H. Nagahama1, A. Mooser1, G. Schneider1,5, M. Bohman1,3, K. Blaum3, Y. Matsuda4, C. Ospelkaus2,6, W. Quint7, J. Walz5,8, Y. Yamazaki1, and S. Ulmer1 — 1RIKEN, Ulmer Fundamental Symmetries Laboratory, Wako, Saitama, Japan — 2Leibniz Universität, Hannover, Germany — 3Max-Planck Institute für Kernphysik, Heidelberg, Germany — 4University of Tokyo, Tokyo, Japan — 5Johannes Gutenberg-Universität, Mainz, Germany — 6Physikalisch-Technische Bundesanstalt, Braunschweig, Germany — 7GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany — 8Helmholtz-Institut Mainz, Mainz, Germany
The BASE collaboration performs high-precision measurements of the fundamental properties of protons and antiprotons in a multi Penning-trap system. Such measurements challenge the Standard Model of particle physics, since any deviation in proton and antiproton properties would hint to yet unknown CPT-odd interactions that would act differently on matter and antimatter-conjugates.
We recently reported a measurement of the antiproton magnetic moment with 1.5 ppb uncertainty (68 % C.L.) based on the frequency ratio of the Larmor frequency to the cyclotron frequency measured with two single antiprotons. We apply a novel two-particle multi-trap scheme, which enhances the data accumulation rate compared to the double trap method. In this way, we improved limits on CPT-odd interactions on antiprotons by a factor 350.