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Journal Article

BASE – the baryon antibaryon symmetry experiment


Blaum,  Klaus
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;


Franke,  Kurt
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Smorra, C., Blaum, K., Bojtar, L., Borchert, M., Franke, K., Higuchi, T., et al. (2015). BASE – the baryon antibaryon symmetry experiment. European Physical Journal - Special Topics, 224(16), 3055-3108. doi:10.1140/epjst/e2015-02607-4.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0029-34F9-0
The Baryon Antibaryon Symmetry Experiment (BASE) aims at performing a stringent test of the combined charge parity and time reversal (CPT) symmetry by comparing the magnetic moments of the proton and the antiproton with high precision. Using single particles in a Penning trap, the proton/antiproton g-factors, i.e. the magnetic moment in units of the nuclear magneton, are determined by measuring the respective ratio of the spin-precession frequency to the cyclotron frequency. The spin precession frequency is measured by non-destructive detection of spin quantum transitions using the continuous Stern-Gerlach effect, and the cyclotron frequency is determined from the particle*s motional eigenfrequencies in the Penning trap using the invariance theorem. By application of the double Penning-trap method we expect that in our measurements a fractional precision of δg/g 10−9 can be achieved. The successful application of this method to the antiproton will consist a factor 1000 improvement in the fractional precision of its magnetic moment. The BASE collaboration has constructed and commissioned a new experiment at the Antiproton Decelerator (AD) of CERN. This article describes and summarizes the physical and technical aspects of this new experiment.