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Q: Fachverband Quantenoptik und Photonik

Q 14: Precision Spectroscopy of Atoms and Ions I (joint session A/Q)

Q 14.7: Talk

Tuesday, March 12, 2024, 12:30–12:45, HS 1098

X-Ray Spectroscopy of the Kα transitions in He-like Uranium — •Philip Pfäfflein1,2,3, Steffen Allgeier4, Sonja Bernitt1,2,3, Andreas Fleischmann4, Marvin Friedrich4, Alexandre Gumberidze2, Christoph Hahn1,2, Daniel Hengstler4, Marc O. Herdrich1,2,3, Felix Kröger1,2,3, Patricia Kuntz4, Michael Lestinsky2, Bastian Löher2, Esther B. Menz1,2,3, Uwe Spillmann2, Sergiy Trotsenko1,2, Günter Weber1,2, Binghui Zhu1,2,3, Christian Enss4, and Thomas Stöhlker1,2,31HI Jena, Germany — 2GSI, Darmstadt, Germany — 3Jena University, Germany — 4Heidelberg University, Germany

Helium-like ions are the simplest atomic multi-body systems. Their study along the isoelectronic sequence allows for precision tests of the interplay of the effects of electron–electron correlation, relativity and quantum electrodynamics (QED) within a wide range of electromagnetic field strengths. Heavy highly charged ions are ideal for probing higher order QED terms. For the 1s state in uranium, e.g. their contributions are on the 1 eV level at binding energies of above 100 keV.

In spring 2021 an X-ray spectroscopy study of helium-like uranium ions has been performed at the electron cooler of the low-energy storage ring CRYRING@ESR at GSI, Darmstadt using metallic magnetic calorimeter detectors. The achieved spectral resolution reveals the substructure of the Kα1 and Kα2 lines for the first time. Using two detectors the Doppler shift was deduced from the recorded spectra. This breakthrough in X-ray spectroscopy enables future precision tests of bound-state QED and many-body effects in extreme field strengths.

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