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A: Fachverband Atomphysik
A 3: Precision spectroscopy of atoms and ions I (joint session A/Q)
A 3.3: Talk
Monday, March 14, 2022, 14:30–14:45, A-H2
High-precision measurement of the hyperfine structure of 3He+ in a Penning trap — •Antonia Schneider1, Bastian Sikora1, Stefan Dickopf1, Marius Müller1, Natalia S. Oreshkina1, Alexander Rischka1, Igor Valuev1, Stefan Ulmer2, Jochen Walz3,4, Zoltan Harman1, Christoph H. Keitel1, Andreas Mooser1, and Klaus Blaum1 — 1Max Planck Institute for Nuclear Physics, Saupfercheckweg 1, D-69117, Heidelberg, Germany — 2RIKEN, Ulmer Fundamental Symmetries Laboratory, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan — 3Institute for Physics, Johannes Gutenberg-University Mainz, Staudinger Weg 7, D-55099 Mainz, Germany — 4Helmholtz Institute Mainz, Staudingerweg 18, D-55128 Mainz, Germany
We investigated the ground-state hyperfine structure of a single 3He+ ion in a Penning trap to directly measure the zero-field hyperfine splitting, the bound electron g-factor and the nuclear g-factor with a relative precision of 3·10−11, 2·10−10 and 8·10−10, respectively. The latter allows for the determination of the g-factor of the bare nucleus with a relative precision of 8·10−10 via our accurate calculation of the diamagnetic shielding constant. This constitutes the first direct calibration for 3He nuclear magnetic resonance (NMR) probes and an improvement of the precision by one order of magnitude compared to previous indirect results [1]. The measured zero-field hyperfine splitting allows us to determine the Zemach radius, which characterizes the electric and magnetic form factors, with a relative precision of 7·10−3.
[1] Y. I. Neronov and N. N. Seregin, Metrologia, 51 (2014) 54.