Speaker
Description
At our Penning-trap experiment µTEx in Heidelberg, Germany, we measure the ground-state hyperfine- and fine-structure splitting of light, hydrogenlike ions in a magnetic field of 5.7T [1]. From these high-precision measurements, the bound-electron and shielded nuclear g-factors as well as the hyperfine-structure constant are extracted [2]. In combination with theory, this allows to test QED, to infer the Zemach radius of a nucleus and to precisely determine fundamental constants such as the electron mass. Additional lithiumlike measurements allow testing of nuclear magnetic shielding theory. The results of the latest beryllium-9 campaign [3] and the current status of the helium-4 measurement will be presented.
[1] A. Mooser et al., J. Phys.: Conf. Ser 1138, 012-004 (2018)
[2] A. Schneider et al., Nature 606, 878-883 (2022)
[3] S. Dickopf et al., to be submitted
