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HK: Fachverband Physik der Hadronen und Kerne
HK 21: Structure and Dynamics of Nuclei V
HK 21.4: Talk
Wednesday, March 18, 2026, 14:45–15:00, AM 00.011
Progress towards Collinear Laser Spectroscopy of stable Phosphorus Atoms — •Imke Lopp, Kristian König, Daniela Tandara, and Wilfried Nörtershäuser — Institut für Kernphysik, Technische Universität Darmstadt
Phosphorus is of special interest for collinear laser spectroscopy, since it offers a proton-halo candidate, 26P, at the proton dripline. By measuring isotope shifts, collinear laser spectroscopy provides access to changes in the nuclear charge radii along the isotopic chain, enabling a sensitive probe of halo structures. In the case of phosphorus, experimental challenges have prevented laser spectroscopy so far. There are no laser-accessible transitions from the ionic or atomic ground state. However, from meta-stable atomic states, transitions in the deep UV at 215 nm and 255 nm can be accessed with state-of-the-art laser systems. Therefore, a charge exchange cell is used to populate these states using in-flight charge exchange reactions. Preparation studies on stable 31P are performed at the COALA setup at TU Darmstadt, where a new charge exchange cell and Penning Ionisation Gauge ion source are commissioned for this purpose. The status of the new charge exchange cell and ion source, as well as the progress towards collinear laser spectroscopy of stable phosphorus atoms will be presented.
This project is supported by BMFTR (05P24RD8) and the German Research Foundation (Project-ID: 279384907 - SFB 1245)
Keywords: Collinear Laser Spectroscopy; Charge Exchange; Ion Source; Phosphorus