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HK: Fachverband Physik der Hadronen und Kerne
HK 21: Structure and Dynamics of Nuclei V
HK 21.1: Group Report
Wednesday, March 18, 2026, 13:45–14:15, AM 00.011
Towards high-precision laser spectroscopy of trapped radioactive ions — •Phillip Imgram1, 2, Stefanos Pelonis1, Tobias Christen1, Julien Grondin1, Angelos Karadimas1, Arda Kayaalp1, Sandro Kraemer1, Agota Koszorus1, Pierre Lassegues1, Robbe Van Duyse1, and Ruben de Groote1 — 1Department of Physics and Astronomy, Instituut voor Kern-en Stralingsfysica, KU Leuven, 3001, Leuven, Belgium — 2Facility for Antiproton and Ion Research in Europe GmbH, Darmstadt, Germany
Benchmarking nuclear models through precise measurements of nuclear observables such as nuclear charge radii and electromagnetic moments in exotic, short-lived nuclei is crucial, and most precise and nuclear-model-independent results are achieved through laser spectroscopy. Here, well-established in-source or collinear laser spectroscopy techniques are usually limited in precision by either the temperature of the ions or the interaction time of the ions with the laser light. To overcome both limitations, a new offline beamline has been commissioned at KU Leuven to develop laser spectroscopy on trapped ions at radioactive ion beam (RIB) facilities [1]. This contribution will give an overview of the project and present the first results from our linear Paul trap, which includes the deceleration, trapping, and laser cooling of Sr+ ions from a 10 keV beam energy to a few 10 mK in temperature and first laser spectroscopy measurements. Finally, an outlook on the upcoming developments in Leuven will be provided and prospects for implementation of this setup at RIB facilities will be explored. [1] P. Imgram et al., Rev. Sci. Instr. 96, 093302 (2025)
Keywords: Laser spectroscopy; Radioactive Isotopes; Isotope shift; Laser cooling; Ion trap