SAMOP 2023 – scientific programme

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A: Fachverband Atomphysik

A 30: Highly Charged Ions and their Applications II

A 30.4: Talk

Friday, March 10, 2023, 15:30–15:45, F107

Precision x-ray spectroscopy of U90+ using novel microcalorimeter detectors — •G. Weber^1,2, Ph. Pfäfflein^1,3, F. Kröger^1,3, B. Zhu^1,3, M. O. Herdrich^1,3, S. Bernitt^1,2, Ch. Hahn^1,2, M. Lestinsky², U. Spillmann², A. Kalinin², B. Löher², T. Over^1,3, D. Hengstler⁴, A. Fleischmann⁴, S. Allgeier⁴, P. Kuntz⁴, E. B. Menz^1,2,3, M. Friedrich⁴, Chr. Enss⁴, and Th. Stöhlker^1,2,3 — ¹Helmholtz-Institut Jena — ²GSI, Darmstadt — ³IOQ, FSU Jena — ⁴KIP, Universität Heidelberg

He-like ions are the simplest atomic multibody systems and the study of L -> K transitions along the isoelectronic sequence provides a unique testing ground for the interplay of the effects of correlation, relativity and quantum electrodynamics. However, for high-Z ions with nuclear charge Z > 54, where K transition energies reach up to 100 keV, there are currently no data available to challenge state-of-the-art theory.

We report on the study of Kα radiation in He-like uranium at the electron cooler of CRYRING@ESR at GSI, using novel microcalorimeters dedicated to high-precision x-ray spectroscopy. A spectral resolution of better than 100 eV FWHM was achieved over a wide range of x-ray energies from a few keV up to more than 100 keV, enabling for the first time to resolve the individual components of the Kα peaks in a heavy He-like system.

This work was conducted in the framework of the SPARC collaboration, exp. E138 of FAIR Phase-0 supported by GSI. We also acknowledge the support provided by ErUM FSP T05 "Aufbau von APPA bei FAIR" (BMBF n°05P19SJFAA and n°05P19VHFA1).