SAMOP 2023 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 9: Penning traps, highest precision, neutrino physics, storage rings, new facilities and approaches

MS 9.1: Hauptvortrag

Freitag, 10. März 2023, 14:30–15:00, F128

Developments to improve antiproton and other mass measurements — •Christian Smorra on behalf of the BASE collaboration — Johannes Gutenberg Universität Mainz — RIKEN Fundamental Symmetries Laboratory — Max-Planck Insititute for Nuclear Physics

Precision mass measurements in Penning traps have been performed on a wide variety of charged particles, and provide important input parameters for testing the fundamental interactions. For example, the most recent precision comparison of the proton and antiproton masses with 16 parts per trillion uncertainty provides the most stringent test of CPT invariance in the baryon sector and an antiparticle test of the weak equivalence principle with unprecedented resolution.

Common limitations to all mass measurements are uncertainties imposed by magnetic field fluctuations and finite particle temperatures. I will present the current efforts by the BASE collaboration to improve on these limitations for the antiproton mass measurements. This comprises the development of the transportable antiproton trap BASE-STEP that provides the possibility to relocate measurements of accelerator-produced particles away from the magnetic noise environment at the production site. Further, I will present the sympathetic cooling method for a single proton in a two-trap system using a cloud of laser-cooled beryllium ions. Here, we exchange energy by image currents between the traps in a coupled oscillator system. Presently, we cool the proton to a fraction of 1 K and plan to extend the cooling range down to the temperature of laser-cooled ions.