Freiburg 2024 – scientific programme
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A: Fachverband Atomphysik
A 19: Precision Spectroscopy of Atoms and Ions II (joint session A/Q)
A 19.4: Talk
Wednesday, March 13, 2024, 11:45–12:00, HS 1098
Towards a direct high-precision measurement of the nuclear magnetic moment of3He2+ with 1ppb accuracy. — •Ankush Kaushik1, Stefan Dickopf1, Marius Müller1, Annabelle Kaiser1, Ute Beutel1, Stefan Ulmer2,3, Andreas Mooser1, and Klaus Blaum1 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 2RIKEN, Wako, Japan — 3HHU Düsseldorf, Germany
Accurate magnetic field measurements are of apparent importance in the field of fundamental physics [1]. However, the accuracy of the current standard in magnetometry, water NMR probes, is limited by the complex molecular structure. With a direct parts-per-billion measurement of the nuclear magnetic moment of 3He2+ in a Penning trap, we aim to overcome this limitation and establish hyperpolarised 3He probes as the new standard. To this end, spin flips of a single nucleon, indicated by miniature frequency changes, need to be detected over background of frequency fluctuations. Since the latter fluctuations are directly proportional to the motional energy, preparing particles at micro eV energies is essential [2]. To address this constraint we designed a new type of Penning trap that enables fast energy measurements while simultaneously allowing the efficient preparation of particles at the required energies. As such, the new trap will be a key element for a successful measurement. Its design and expected performance will be presented.
[1] Mooser et al., J. Phys.: Conf. Ser. 1138 012004 (2018)
[2] Ulmer et al., Physical Review Letters, 106(25) 253001 (2011)