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Quantum Electrodynamics in Strong Electromagnetic Fields: Substate Resolved K$\alpha$ Transition Energies in Helium-like Uranium
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abstract
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$\alpha$ 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.
Forward citations
Cited by 2 Pith papers
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One-loop electron self-energy with accelerated partial-wave expansion in Coulomb gauge
Coulomb-gauge accelerated partial-wave methods now compute one-loop electron self-energies for hydrogen-like ions from Z=1 to Z=100, including high excited states.
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A Bayesian Approach for Strong Field QED Tests with He-like Ions
A Bayesian reanalysis of helium-like ion transition data finds no significant deviation from QED, reducing earlier frequentist claims to a roughly 2.7 sigma residual.
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