Freiburg 2024 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 11: Precision Spectroscopy of Atoms and Ions I (joint session A/Q)
A 11.2: Vortrag
Dienstag, 12. März 2024, 11:15–11:30, HS 1098
Measurement of the bound-electron g-factor in 4He+ for the determination of the electron mass — •Marius Müller1, Stefan Dickopf1, Annabelle Kaiser1, Ute Beutel1, Ankush Kaushik1, Stefan Ulmer2,3, Andreas Mooser1, and Klaus Blaum1 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Deutschland — 2RIKEN, Wako, Japan — 3Heinrich-Heine-Universität, Düsseldorf, Deutschland
The determination of fundamental constants is of great importance for many fields of science and technology. One of these fundamental constants is the atomic mass of the electron, which was previously determined to a fractional uncertainty of 30 ppt by a collaborative effort of high-precision Penning-trap g-factor measurements of hydrogen-like carbon-12 and state-of-the-art bound-state QED calculations [1]. Recent measurements of the helium-4 mass at LIONTRAP with a relative precision of 12 ppt [2] allow for an independent cross-check of the electron mass in a different ionic system and further enable an improvement in precision by a factor of 2.5.
At our experimental Penning-trap setup at the MPIK in Heidelberg [3], we are currently conducting high-precision bound-electron g-factor measurements of 4He+ in order to improve the precision of the atomic mass of the electron. The current status and first experimental results of the helium-4 measurement campaign will be presented.
[1] S. Sturm et al., Nature 506, 467 (2014)
[2] S. Sasidharan et al., Phys. Rev. Lett. 131, 093201 (2023)
[3] A. Schneider et al., Nature 606, 878 (2022)
Keywords: Penning Traps; Precision Measurements; Electron Mass; g-Factor; Helium-4