Freiburg 2024 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 5: Heavy and Superheavy Nuclei

MS 5.2: Vortrag

Mittwoch, 13. März 2024, 11:30–11:45, HS 3042

Status of the JetRIS experiment for on-line laser spectroscopy of superheavy elements — •Sebastian Raeder for the JetRIS collaboration — GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt — Helmholtz-Institut Mainz

Laser spectroscopy of the heaviest elements is of high relevance for our understanding of fundamental atomic and nuclear structure. Atomic energy levels in heavy systems become strongly influenced by electron correlations as well as relativistic effects and are largely unknown for transfermium elements, while posing a major challenge to theory. From a nuclear physics point of view, superheavy elements lie on the frontier to the region of enhanced shell stabilization, with their unique structure manifesting in the evolution of various observables. Laser spectroscopy enables the determination of spins, electromagnetic moments and changes in mean square charge radii. Experiments on transfermium elements have to be performed on-line with quantities of few atoms per second or below. At GSI, fusion-evaporation products are separated from the primary beam by the SHIP velocity filter and stopped in a gas cell. In-gas cell spectroscopy has been used successfully to probe the spectra of No and Fm. However, the spectral resolution of this method is limited by Doppler- and pressure broadening, which often renders a detailed evaluation of hyperfine structures impossible. The JetRIS setup improves spectral resolution by performing spectroscopy in a low-pressure, low-temperature supersonic gas jet and enables experimental linewidths in the order of few hundred MHz. The current status of the JetRIS experiment will be presented.

Keywords: Laser spectroscopy; Gas jet; Actinides; Superheavy elements; MR-ToF