Freiburg 2024 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
A: Fachverband Atomphysik
A 22: Highly Charged Ions and their Applications I
A 22.4: Talk
Wednesday, March 13, 2024, 15:15–15:30, HS 1098
Laser spectroscopy of hydrogen-like 208Bi82+ — •Rodolfo Sánchez for the LIBELLE collaboration — GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
We report the first successful measurement of the 1s hyperfine splitting of the high-Z radioactive ion 208Bi82+. The experiment was performed at GSI, the facility for heavy ion research, where these exotic ions were produced in flight and stored in the experimental storage ring (ESR) at a velocity of 72% of the speed of light. At this speed, the Doppler shift transforms the visible laser light into the far ultraviolet range required to drive the hyperfine-transition in 208Bi82+.
The observation of this hyperfine line is a very important step towards the determination of the so-called "specific difference", a weighted difference between the hyperfine transition energies in hydrogen-like and lithium-like ions that eliminates uncertainties due to the nuclear magnetic moment distribution [1]. At this point, only the specific difference provides the means to test QED in the strongest magnetic fields available in the laboratory and has been determined so far exclusively for the stable isotope 209Bi [2,3].
[1] V. M. Shabaev, et al., Phys. Rev. Lett. 86, 3959 (2001).
[2] J. Ullmann, et al., Nature Comm. 8, 15484 (2017).
[3] L. V. Skripnikov, et al. Phys. Rev. Lett. 120, 093001 (2018).
Keywords: QED; Hyperfine Splitting; High-Z