Precision tests of QED in strong fields: experiments on hydrogen- and helium-like uranium

In this contribution, we present an experimental study carried out at GSI Darmstadt devoted to investigation of quantum electrodynamical (QED) effects for the ground states in hydrogen- and helium-like uranium. In the experiment, X-ray spectra following radiative recombination of free electrons with...

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Bibliographic Details
Published in:Journal of physics. Conference series 2007-03, Vol.58 (1), p.87-92
Main Authors: Gumberidze, A, Stöhlker, Th, Banaś, D, Beckert, K, Beller, P, Beyer, H F, Bosch, F, Cai, X, Hagmann, S, Kozhuharov, C, Liesen, D, Nolden, F, Ma, X, Mokler, P H, Steck, M, Sierpowski, D, Tashenov, S, Warczak, A, Zou, Y
Format: Article
Language:English
Subjects:
Free electrons
Helium
Physics
Quantum electrodynamics
Radiative recombination
Storage rings (particle accelerators)
Uranium
X ray spectra
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Summary:In this contribution, we present an experimental study carried out at GSI Darmstadt devoted to investigation of quantum electrodynamical (QED) effects for the ground states in hydrogen- and helium-like uranium. In the experiment, X-ray spectra following radiative recombination of free electrons with bare and H-like uranium ions (U92+, U91+) were measured at the electron cooler of the ESR storage ring. Utilizing clean and favorable experimental conditions present at the electron cooler, we were able to obtain very accurate values for the ground-state binding energies from the observed X-ray transitions. When compared with theory, our results provide the most stringent test of bound-state QED for one- and two-electron systems in the strong-field regime.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/58/1/013