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Stored and Cooled Ions Division
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g-factor measurements with highly-charged ions and proton/antiproton

g-Factor of the Proton

The magnetic moment of the proton is currently known at a level of 1E-8. The value is extracted from high precision hyperfine spectroscopy by means of a MASER in a magnetic field. We intend to improve the current value by a factor of 10, at least. To this end, a double-Penning trap setup has been developed. Recently the first spin quantum-jumps were detected, which is a crucial milestone towards the high precision measurement of the magnetic moment of the proton. This opens up a highly exciting perspective, a new high precision test of the matter-antimatter symmetry, which is one of the most fundamental symmetries of the standard model of high energy physics. The method applied in this experiment can be directly applied to measure the g-factor of the antiproton, which is currently known at a level of 1E-3 only. We intend to improve the experimental precision by a factor of one million or better. Read the details here … >

g-Factor of the Electron in highly-charged ions

Determination of the g-factor of the bound electron in highly-charged ions. This experiment represents to date the most accurate test of QED in strong fields and also allows the determination of fundamental constants with extremely high precision. Read more details about the measurement principle, the experimental setup, the results and the current status … >