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HK: Fachverband Physik der Hadronen und Kerne
HK 21: Structure and Dynamics of Nuclei V
HK 21.7: Vortrag
Mittwoch, 18. März 2026, 15:30–15:45, AM 00.011
Production and Collinear Laser Spectroscopy of Helium-like Boron Ions — •Emily Burbach, Hendrik Bodnar, Finn Köhler, Kristian König, Imke Lopp, Wilfried Nörtershäuser, and Julien Spahn — Institut für Kernphysik, Technische Universität Darmstadt
Nuclear ground state properties of short-lived isotopes can be studied using collinear laser spectroscopy (CLS). Differential root-mean-square charge radii can be derived from isotope shifts of atomic transitions between different isotopes. For light systems, also the absolute charge radius can be determined by applying NRQED calculations and high-precision absolute frequency measurements. The Collinear Apparatus for Laser Spectroscopy and Applied Sciences (COALA) at TU Darmstadt is suitable for high-precision transition frequency measurements at the ppb-level that are required for light isotopes. There, highly charged boron ions were produced in an electron beam ion source. We present experimental details on the efficient production of helium-like boron ions in the metastable 3S1 state, where laser-accessible atomic transitions occur at 283 nm and the subsequent laser spectroscopy measurements. The absolute charge radius of 11B can be determined from the transition frequency and NRQED calculations, which was previously demonstrated for 12C [1]. An overview of the current status of the analysis is given.
This project is supported by DFG (Project-ID 279384907 - SFB 1245).
[1] P. Imgram et al., Phys. Rev. Lett. 131, 243001 (2023).
Keywords: Collinear Laser Spectroscopy; Electron Beam Ion Source; Highly Charged Ions; Boron; Charge Radius