Abstract:
In the Alphatrap experiment, the 𝑔 factor of boronlike 118Sn45+ has been measured with a 0.5 ppb uncertainty. This is the first high-precision measurement of the 𝑔 factor of a heavy boronlike ion. The measured value of 0.6 447 038 265(4) is consistent with the presented ab initio state-of-the-art theory calculations, which predict a value of 0.64 470 29(8). So far, the only boronlike ion of which the 𝑔 factor was measured with high precision has been 40Ar13+. The measurement presented here therefore tests quantum electrodynamics as well as many-electron interactions at much higher 𝑍. Furthermore, we discuss the potential for an independent determination of the fine-structure constant 𝛼, which can be achieved with a specific difference of 𝑔 factors, combining the presented results with the recent electron 𝑔-factor measurement of hydrogenlike tin.
J. Morgner, B. Tu, M. Moretti, C. M. König, F. HeiSSe, T. Sailer, V. A. Yerokhin, B. Sikora,
N. S. Oreshkina, Z. Harman, C. H. Keitel , S. Sturm , K. Blaum, „g Factor of Boronlike Tin“,
Phys. Rev. Lett. 134, 123201 (2025).
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.134.123201
Related to Project B01, B02