Sprecher
Beschreibung
We briefly report on the first laser excitation of the ground-state hyperfine transition in lithium-like 208Bi80+. The experiment took place at the ESR during the beam-time block at GSI in May 2025 (GPAC-Experiment: G-22-00038). The detection of the transition became possible by combining the laser excitation with dielectronic recombination as (DR) a new detection scheme.
Therefore, the electron cooler is set to a voltage that allows the DR process from the upper hyperfine state, but not from the lower one. Resonantly driving the laser transition to the upper state will then lead to an appearance of the DR signal.
We have demonstrated this technique for the first time using the radioactive isotope 208Bi in the lithium charge state, which is by itself very challenging to be produced and stored at the required energy at the ESR. In summary, a beam time with ups and some downs and a happy end. Precision measurements are now envisaged for the next beam time, which has already been granted by the GPAC (Proposal: G-24-00290).
