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Main Authors:	Pfäfflein, Philip, Weber, Günter, Allgeier, Steffen, Andelkovic, Zoran, Bernitt, Sonja, Bondarev, Andrey I., Borovik, Alexander, Duval, Louis, Fleischmann, Andreas, Forstner, Oliver, Friedrich, Marvin, Glorius, Jan, Gumberidze, Alexandre, Hahn, Christoph, Hengstler, Daniel, Herdrich, Marc Oliver, Herfurth, Frank, Hillenbrand, Pierre-Michel, Kalinin, Anton, Kiffer, Markus, Kröger, Felix Martin, Kubullek, Maximilian, Kuntz, Patricia, Lestinsky, Michael, Litvinov, Yuri A., Löher, Bastian, Menz, Esther Babette, Over, Tobias, Petridis, Nikolaos, Ringleb, Stefan, Sighu, Ragandeep Singh, Spillmann, Uwe, Trotsenko, Sergiy, Warczak, Andrzej, Zhu, Binghui, Enss, Christian, Stöhlker, Thomas
Format:	Preprint
Published:	2024
Subjects:	Atomic Physics
Online Access:	https://arxiv.org/abs/2407.04166
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Using novel metallic magnetic calorimeter detectors at the CRYRING@ESR, we recorded X-ray spectra of stored and electron cooled helium-like uranium (U$^{90+}$) with an unmatched spectral resolution of close to 90 eV. This allowed for an accurate determination of the energies of all four components of the K$α$ transitions in U$^{90+}$. We find good agreement with state-of-the-art bound-state QED calculations for the strong-field regime. Our results do not support any systematic deviation between experiment and theory in helium-like systems, the presence of which was subject of intense debates in recent years.

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