SAMOP 2023 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 12: Precision Spectroscopy of Atoms and Ions I (joint session A/Q)
Q 12.6: Talk
Monday, March 6, 2023, 18:30–18:45, F107
Ground-state hyperfine spectroscopy of 3He+ in a Penning trap — •Marius Müller1, Antonia Schneider1, Bastian Sikora1, Stefan Dickopf1, Annabelle Kaiser1, Natalia S. Oreshkina1, Alexander Rischka1, Igor A. Valuev1, Stefan Ulmer2, Jochen Walz3,4, Zoltan Harman1, Christoph H. Keitel1, Andreas Mooser1, and Klaus Blaum1 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 2RIKEN, Ulmer Fundamental Symmetries Laboratory, Wako, Japan — 3Helmholtz-Institut, Mainz, Germany — 4Johannes Gutenberg Universität, Mainz, Germany
Hyperpolarized 3He NMR magnetometers have intrinsically smaller systematic corrections than standard water NMR probes [1]. Therefore, they are an excellent candidate for high-precision absolute magnetometry in several experiments such as the muon g-2 experiments.
We measured the four ground-state hyperfine transition frequencies of a single 3He+ ion, stored in the 5.7 T magnetic field of our cryogenic double Penning trap setup. From the spin-flip resonances the electronic and nuclear g-factors ge and gI, the zero-field hyperfine splitting Ehfs, as well as the Zemach radius rZ were extracted with a relative precision of 220 ppt, 810 ppt, 30 ppt and 0.9 %, respectively [2]. This constitutes a direct calibration of 3He NMR probes and an improvement of the precision by one order of magnitude compared to previous indirect measurements of the nuclear magnetic moment.
[1] Farooq et al., Phys. Rev. Lett. 124, 223001 (2020)
[2] Schneider et al., Nature 606, 878-883 (2022)