Köln 2025 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 25: Focus Session II: Accurate Nuclear Charge Radii of Light Elements
HK 25.1: Invited Talk
Wednesday, March 12, 2025, 14:00–14:25, HS 1 Physik
First laser spectroscopic measurements of charge radii along the carbon isotope chain — •Kristian König, Emily Burbach, Phillip Imgram, Bernhard Maaß, Patrick Müller, Wilfried Nörtershäuser, and Julien Spahn — TU Darmstadt, Germany
Light nuclei are ideal test cases for nuclear structure calculations as they exhibit many facets of nuclear structure like halos and clustering and are accessible for high-precision ab-initio calculations. The nuclear charge radius is a key observable and in an ongoing effort it is planned to determine absolute and differential charge radii, RC and δ ⟨ r2 ⟩, of the light elements Be to N by purely using collinear laser spectroscopy and non-relativistic quantum electrodynamics calculations (NR-QED). Helium-like ions of these species provide laser-accessible atomic transitions that can be calculated with high accuracy in the NR-QED approach. As a first step, the 1s2s 3S1 → 1s2p 3PJ transitions in 12−14C4+ were determined using the Collinear Apparatus for Laser Spectroscopy and Applied Science (COALA) at the Technical University of Darmstadt. These represent the first optical charge radius measurements in the carbon isotopic chain and will be the starting point for the necessary improvement of the charge radii of the light-mass nuclei. This contribution will give an overview of the project and present the measured transition frequencies along with the extracted nuclear charge radii of 12−14C, which are compared to results from electron scattering and muonic atom spectroscopy experiments as well as to state-of-the-art theory. This project was supported by DFG (Project-ID 279384907 - SFB 1245) and by BMBF (05P21RDFN1).
Keywords: Collinear laser spectroscopy; highly-charged ions; carbon; charge radius