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Q: Fachverband Quantenoptik und Photonik
Q 64: Poster – Precision Spectroscopy of Atoms and Ions (joint session A/Q)
Q 64.12: Poster
Donnerstag, 13. März 2025, 17:00–19:00, Tent
Precision X-Ray Spectroscopy of Kα transitions in He-like Uranium using Metallic Magnetic Calorimeter Detectors — •Daniel A. Müller1,3, Philip Pfäfflein1,2,3, Marc O. Herdrich1,3, Felix M. Kröger1,2,3, Michael Lestinsky2, Daniel Hengstler4, Andreas Fleischmann4, Christian Enss4, Günter Weber2,3, and Thomas Stöhlker1,2,3 — 1HI-Jena, Jena — 2GSI, Darmstadt — 3FSU, Jena — 4KIP, Heidelberg
He-like ions, as the simplest atomic multibody system, provide a unique testing ground for the interplay of the effects of electron-electron correlations and quantum electrodynamics (QED) in various field strengths. Especially heavy highly charged ions are ideal for probing higher order QED terms, where experiments with ions at nuclear charge states Z > 54 currently are not available. An X-ray spectroscopy study of He-like uranium ions has been performed at the electron cooler of the storage ring CRYRING@ESR at GSI Darmstadt, using detectors of the maXs series, developed within the SPARC collaboration. Those detectors are a powerful tool for spectroscopy, measuring photons of a few keV to over 100 keV allowing the simultaneous investigation of Balmer-like and Kα transitions. The application of detectors in forward and backward direction furthermore enabled the determination of the Doppler shift. The achieved spectral resolution of better than 90 eV at X-ray energies close to 100 keV reveals the substructure of the Kα1 and Kα2 lines for the first time. This breakthrough paving the way for future tests of bound-state QED and many-body effects in extreme field strengths is presented in the poster.
Keywords: Metallic Magnetic Calorimeter; precision X-ray spectroscopy; bound-state QED