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A: Fachverband Atomphysik
A 12: Precision Spectroscopy of Atoms and Ions II (joint session A/Q)
A 12.4: Talk
Tuesday, March 3, 2026, 12:00–12:15, N 3
Advances in the investigation of atomic transitions in Lr — •Elisabeth Rickert for the Lawrencium Collaboration collaboration — GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany — Hemholtz-Institut, Mainz, Germany — Johannes Gutenberg-Universität, Mainz,Germany
The investigation of the atomic level structure of the heaviest elements is experimentally and theoretically challenging. The electric shell structure of transfermium elements is strongly influenced by relativistic effects, which significantly complicates theoretical predictions. Experimentally, atomic levels are largely unknown for Z>100, whereby low production cross sections and short half-lives demand a tailored approach for laser spectroscopy on single-atom-at-a-time quantities. The RAdiation Detection Resonance Ionization Spectroscopy (RADRIS) technique has been successfully applied for the atomic level search in nobelium (No, Z=102). In recent years, the RADRIS setup has been adapted to investigate the atomic structure of lawrencium (Lr, Z=103). The two strongest ground-state transitions have been theoretically predicted in the regions around 20420 cm−1 (2S1/2) and 28500 cm−1 (2D3/2 state). In 2020 and 2022, over 800 cm−1 and 700 cm−1 have been scanned around the predicted transition wavenumber in the visible and uv range, respectively. So far, no transition could be detected, but 35% of the anticipated uncertainty of the theoretical predictions is still to be investigated. In the contribution, the status of the experiment and the data analysis will be presented.
Keywords: Actinides; Resonant laser spectroscopy; In gas-cell; Superheavy Elements