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HK: Fachverband Physik der Hadronen und Kerne
HK 21: Structure and Dynamics of Nuclei V
HK 21.2: Vortrag
Mittwoch, 18. März 2026, 14:15–14:30, AM 00.011
POSEIDON: A new setup for collinear laser spectroscopy at the N=126 factory — •Julian Palmes1, Guy Savard2, and Jason Clark2 for the POSEIDON collaboration — 1Institut für Kernphysik der Technischen Universität Darmstadt, Darmstadt, Germany — 2Argonne National Laboratory, Lemont, USA
The nuclear charge radius is a fundamental nuclear observable and a sensitive probe of the forces and correlations that shape atomic nuclei. While for stable isotopes, absolute radii can be determined by muonic spectroscopy and electron scattering, the extraction of differential charge radii of exotic nuclei relies on optical isotope shift measurements. In the neutron-rich region near the N=126 shell closure, which is of special interest for astrophysical processes, our knowledge of those fundamental properties is sparse. These isotopes are difficult to produce due to limited cross-sections for conventional methods. Multi-nucleon transfer (MNT) reactions provide sufficiently large cross sections but have large momentum transfers, making beam collection challenging.
At the N=126 factory at the Argonne National Laboratory, a gas catcher directly after the target will collect these exotic nuclei and allow spectroscopy on MNT reaction products. We present POSEIDON, our newly designed collinear laser spectroscopy beamline and present plans to measure the charge radius of platinum isotopes across N=126.
This project is supported by the German Research Foundation (Project-ID 279384907 - SFB1245).
Keywords: collinear laser spectroscopy; N=126; charge radii