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A: Fachverband Atomphysik
A 26: Precision Spectroscopy of Atoms and Ions III (joint session A/Q)
A 26.1: Hauptvortrag
Donnerstag, 9. März 2023, 14:30–15:00, F303
Laser spectroscopy of the heaviest elements with the RADRIS technique — •Tom Kieck for the RADRIS collaboration — GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany — Helmholtz-Institut Mainz, Germany
Exploring atomic and nuclear properties in the region of the heaviest elements through laser spectroscopy became possible with the RAdiation Detected Resonance Ionization Spectroscopy (RADRIS) technique at GSI. Fusion evaporation reaction products are separated from the primary beam in the velocity filter SHIP and then stopped in high-purity argon gas and collected onto a thin hafnium filament. Following re-evaporation, the released neutral atoms are probed by two-step resonance laser ionization. The resulting photo-ions are guided to a silicon detector for identification by their characteristic alpha radiation.
After a first observation and characterisation of an atomic ground-state transition in nobelium (Z=102), the technique was applied to several nobelium and fermium isotopes. We present advancements of the RADRIS technique together with recent results from the FAIR phase-0 beamtime 2022 at GSI. The setup performance was optimised to achieve higher total efficiency, which is now up to 15 %. Improved stability of the system allowed the search for atomic levels in lawrencium (Z=103) for more than 400 hours. In addition, the short-lived isotope 251No (T1/2=0.8 s) was studied along with several fermium and californium isotopes. These results and further prospects will be discussed.