Erlangen 2018 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 9: Precision Spectrosocopy II - trapped ions (joint session A/Q)
A 9.4: Vortrag
Montag, 5. März 2018, 15:15–15:30, K 1.016
Resonant coupling of single protons and laser cooled Be ions — •Natalie Schön1,2,7, Matthew Bohman2,3, Andreas Mooser2, Georg Schneider1,2, Markus Wiesinger2,3, James Harrington3, Takashi Higuchi2,4, Stefan Sellner2, Christian Smorra2,5, Klaus Blaum3, Yasuyuki Matsuda4, Wolfgang Quint6, Jochen Walz1,7, and Stefan Ulmer2 — 1University of Mainz, Germany — 2RIKEN, Ulmer Fundamental Symmetries Laboratory, Japan — 3MPIK Heidelberg, Germany — 4University of Tokyo, Japan — 5CERN, Switzerland — 6GSI Darmstadt, Germany — 7Helmholtz Institut Mainz, Germany
The relativistic quantum field theories of the Standard Model are invariant under the combined charge (C), parity (P) and time (T) transformation. To test this fundamental symmetry the BASE collaboration compares the g-factor and charge to mass ratio of protons and antiprotons with highest precision. Using Penning traps, we have recently performed 0.3 ppb and 1.5 ppb measurements of the proton and the antiproton g-factors, respectively. The uncertainties in the g-factor values are dominated by effects due to the energy of the trapped particle at 4 K. To overcome this limitation, we plan to resonantly couple the axial modes of laser cooled beryllium ions and of single (anti)protons. To match the axial frequencies a resonant circuit is used, which however heats the particles. Thus, after frequency matching, the resonant circuit will be decoupled from the ions by switching its resonance frequency. To this end several switches, with high isolation resistance and low insertion loss, were tested at cryogenic temperatures.