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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. Borchert^1,2, J. A. Harrington³, T. Higuchi^1,4, H. Nagahama¹, A. Mooser¹, G. Schneider^1,5, M. Bohman^1,3, K. Blaum³, Y. Matsuda⁴, C. Ospelkaus^2,6, W. Quint⁷, J. Walz^5,8, 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.