Erlangen 2018 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 9: Precision Spectrosocopy II - trapped ions (joint session A/Q)
A 9.3: Vortrag
Montag, 5. März 2018, 15:00–15:15, K 1.016
Towards Sympathetic Cooling of a Single Proton in a Penning Trap for a High-Precision Measurement of the Proton Magnetic Moment — •Markus Wiesinger1,2, Matthew Bohman1,2, Andreas Mooser2, Georg Schneider2,3, Natalie Schön2,3,4, James Harrington1, Takashi Higuchi2,5, Stefan Sellner2, Christian Smorra2,7, Klaus Blaum1, Yasuyuki Matsuda5, Wolfgang Quint6, Jochen Walz3,4, and Stefan Ulmer2 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 2Ulmer Fundamental Symmetries Laboratory, RIKEN, Wako, Japan — 3Institut für Physik, Johannes Gutenberg-Universität, Mainz, Germany — 4Helmholtz-Institut Mainz, Mainz, Germany — 5Graduate School of Arts and Sciences, University of Tokyo, Tokyo, Japan — 6GSI-Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany — 7CERN, Geneva, Switzerland
Precise comparisons of the fundamental properties of protons and antiprotons, such as magnetic moments and charge-to-mass ratios, provide stringent tests of CPT invariance, and thus, matter-antimatter symmetry. Using advanced Penning-trap methods, we have recently determined the magnetic moments of the proton and the antiproton with fractional precisions on the p.p.b. level [1,2].
Both experiments rely on sub-thermal cooling of the particle’s modified cyclotron mode using feedback-cooled tuned circuits. This time-consuming process is ultimately required to identify single spin quantum transitions with high detection fidelity, which is a major prerequisite to apply multi-trap methods.
In order to advance our techniques and to drastically reduce the measurement time, we are currently implementing methods to sympathetically cool protons and antiprotons by coupling them to laser-cooled beryllium ions, using a common endcap method [3]. In this talk we present the status of our ongoing efforts to deterministically prepare single protons and antiprotons at mK-temperatures.
[1] Schneider, G. et al. Science 358, 1081 (2017)
[2] Smorra, C. et al. Nature 550, 371 (2017)
[3] Heinzen, D. J. & Wineland, D. J. Phys. Rev. A, 42, 2977 (1990)