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- Centre National de la Recherche ScientifiqueFR562 papers
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7 papers · 2 filters
One-loop electron self-energy with accelerated partial-wave expansion in Coulomb gauge
V. A. Yerokhin, Z. Harman, C. H. Keitel
Numerical calculations of the electron self-energy without any expansion in the binding nuclear field are required in order to match the rapidly advancing precision of experimental…
Two-loop electron self-energy for low nuclear charges
V. A. Yerokhin, Z. Harman, C. H. Keitel
Calculations of the two-loop electron self-energy for the Lamb shift are reported, performed to all orders in the nuclear binding strength parameter (where is the nuc…
Role of the Coulomb Potential in Compton Scattering
N. Melzer, M. Kircher, A. Pier +18
We report a fully differential study of ionization of the Ne L-shell by Compton scattering of 20 keV photons. We find two physical mechanisms which modify the Compton-electron emis…
Precision spectroscopy on Be overcomes limitations from nuclear structure
Stefan Dickopf, Bastian Sikora, Annabelle Kaiser +7
Many powerful tests of the Standard Model of particle physics and searches for new physics with precision atomic spectroscopy are plagued by our lack of knowledge of nuclear proper…
Dissociative recombination of rotationally cold ArH
Ábel Kálosi, Manfred Grieser, Leonard W. Isberner +11
We have experimentally studied dissociative recombination (DR) of electronically and vibrationally relaxed ArH in its lowest rotational levels, using an electron--ion merged-be…
Nuclear magnetic shielding in heliumlike ions
Vladimir A. Yerokhin, Krzysztof Pachucki, Zoltán Harman +1
Ab initio QED calculations of the nuclear magnetic shielding constant in helium-like ions are presented. We combine the nonrelativistic QED approach based on an expansion in powers…