Köln 2025 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 1: Heavy and Superheavy Elements

MS 1.4: Vortrag

Montag, 10. März 2025, 16:00–16:15, HS 2 Chemie

Status and prospects for laser spectroscopy with RADRIS — •Kenneth van Beek for the SHE Laser collaboration — TU Darmstadt — GSI Helmholtzzentrum für Schwerionenforschung GmbH

The experimental determination of atomic and nuclear properties such as atomic energy levels, ionization potentials, electromagnetic moments, trends in mean-square charge radii, and isotope shifts for nuclei in the region of heavy actinides (Z≥100) remains limited. The main challenges are low production rates in accelerator facilities and the short half-life of the fusion products. This necessitates the use of highly efficient and selective laser spectroscopy techniques. At GSI-FAIR in Darmstadt, Germany, the RAdiation Detected Resonance Ionization Spectroscopy (RADRIS) apparatus has been succesfully used to study aforementioned properties in ^{245,246,248−250,254}Fm and ^252−255No.

This contribution deals with the latest results with RADRIS, which include laser spectroscopy of ^152−154Tm and, for the first time, of ¹⁵²Tm. Here, the isotope shift was measured in three different optical transitions. These results are discussed in particular with regard to a planned search for atomic levels in the chemical element Md (Z=101), for which Tm is the chemical homolog.

Keywords: Spectroscopy; Thulium; RADRIS; Heavy Elements