Hannover 2020 – scientific programme
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MS: Fachverband Massenspektrometrie
MS 1: Precision Mass Spectrometry I
MS 1.3: Talk
Monday, March 9, 2020, 11:45–12:00, f128
Towards an improved measurement of the antiproton g-factor — •Stefan Erlewein1,2,3, Matthias Borchert1,4, Jack Devlin1,3, Markus Fleck1,3, James Harrington1,2, Motoki Sato1,5, Jan Warncke1,4, Elise Wursten1,3, Matthew Bohman1,2, Christian Smorra1, Markus Wiesinger1,2, Christian Will1,2, Klaus Blaum2, Yasuyuki Matsuda5, Christian Ospelkaus4,7, Wolfgang Quint6, Jochen Walz8,9, Yasunori Yamazaki1, and Stefan Ulmer1 — 1RIKEN, Ulmer Fundamental Symmetries Laboratory, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan — 2Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117, Heidelberg, Germany — 3CERN, Esplanade des Particules 1, 1217 Meyrin, Switzerland — 4Institut für Quantenoptik, Leibniz Universität, Welfengarten 1, D-30167 Hannover, Germany — 5Graduate School of Arts and Sciences, University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-0041, Japan — 6GSI-Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, D-64291 Darmstadt, Germany — 7Physikalisch-Technische Bundesanstalt, Bundesallee 100, D-38116 Braunschweig, Germany — 8Helmholtz-Institut Mainz, Johannes Gutenberg-Universität, Staudingerweg 18, D-55128 Mainz, Germany — 9Institut für Physik, Johannes Gutenberg-Universität, Staudinger Weg 7, D-55128 Mainz, Germany
The BASE experiment, located at CERN’s Antiproton Decelerator (AD) facility, measures the fundamental properties of protons and antiprotons in order to test CPT symmetry with high precision. In 2015, the first ever non-destructive observation of spin flips with a single trapped antiproton was demonstrated, allowing the measurement of the antiproton’s magnetic moment to a fractional precision of 1.5 parts-per-billion (p.p.b.), which improved previous results by about a factor of 3000.
In my talk, I will give an overview of the BASE experiment and discuss limitations of the 1.5 p.p.b. measurement of the antiproton’s magnetic moment. I will present a new technique for the detection of a single trapped antiproton’s spinstate, which will allow for measurements at increased sampling rate. The application of this scheme and the introduction of additional experiment upgrades will enable an antiproton g-factor measurement with a fractional uncertainty of 100 p.p.t. on the short term.