BASE Celebrates First Antiproton Birthday

A crucuial device in the BASE multi-Penning trap system is a reservoir trap for antiprotons. This trap is loaded with a cloud of antiprotons provided by CERN's antiproton decelerator and methods were developed to extract single particles from this reservoir and to supply them to our high precision measurement traps. This allows BASE to continuously perform experiments with antiprotons, independent from accelerator maintenance and shutdown cycles. Today we celebrate the first birthday of four remaining antiprotons which were trapped on the 11th of November 2015. This is the first time that trapping of baryonic antimatter has been demonstrated for such a long period. At our Mainz experiment  and in the context of our most precise measurement of the magnetic moment of the proton, carried-out in 2013 and 2014, we have previously demonstrated trapping of a single proton for about 13 months.

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