Freiburg 2024 – scientific programme
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A: Fachverband Atomphysik
A 19: Precision Spectroscopy of Atoms and Ions II (joint session A/Q)
A 19.2: Talk
Wednesday, March 13, 2024, 11:15–11:30, HS 1098
Atomic level search in lawrencium — •Elisabeth Rickert for the Lawrencium collaboration — GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany — Johannes Gutenberg-Universität Mainz, 55128 Mainz,Germany — Helmholtz-Institut Mainz, 55128 Mainz, Germany
The study of the electronic shell structure of the heaviest elements is a challenging endeavour. A strong influence of relativistic effects, electron-electron correlations, and QED effects, challenge the prediction of the atomic structure. The experimental investigation of elements beyond Z=100 is further complicated by their limited availability and short half-lives as well as their experimentally unknown atomic level structure. Recent laser spectroscopy on nobelium (Z=102) in single-atom-at-a-time quantities with the RAdiation Detection Resonance Ionization Spectroscopy (RADRIS) technique opened the path towards laser spectroscopy experiments of yet heavier elements. For the heaviest actinide, lawrencium (Z=103), two ground-state transitions to the 2S1/2 state at around 20420 cm−1 and to the 2D3/2 state at around 28500 cm−1, are predicted. In 2020 and 2022, over 1000 cm−1 around the predicted tranisition wavenumbers have been scanned to search for these transitions. In the talk, the current status of the experiment and the data analysis will be presented.
Keywords: Actinides; Resonant laser spectroscopy