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A: Atomphysik
A 11: Postersitzung 1
A 11.16: Poster
Dienstag, 25. März 2003, 16:00–18:30, Poster
X-ray Transitions Studied for Decelerated Bare and H-like Uranium Ions at the ESR Electron Cooler — •Alexandre Gumberidze1,2,3, Thomas Stöhlker1,2, Genia Bednarz4, Heinrich Beyer1, Fritz Bosch1, X. Cai5, Siegbert Hagmann1,2, Otto Klepper1, Christophor Kozhuharov1, Dieter Liesen1, Xinwen Ma5, Paul Mokler1, Dominik Sierpowski4, Zbigniew Stachura6, Markus Steck1, Sven Toleikis1, Andrzej Warczak4, and Y. Zou7 — 1GSI-Darmstadt, Germany — 2IKF, Univ. of Frankfurt, Germany — 3Tbilisi State University, Georgia — 4Institute of Physics, Cracow University, Poland — 5IMP, Lanzhou, China — 6INP, Cracow, Poland — 7Fudan University, Shanghai, China
Here we report on X-ray spectra induced by spontaneous capture of free electrons into decelerated bare and hydrogen like uranium ions which we measured recently at the cooler section of the ESR storage ring. The most intense lines observed in spectra can be attributed to direct transition of electrons into the K shell of the projectile ions and to characteristic L —→ K (Lyα) transitions. Radiative recombination lines into the K shell of bare and H-like uranium can be exploited for measuring the two-electron contribution to the ground state binding energy in helium-like uranium. The goal is to probe for high-Z ions bound-state QED corrections which are of the order of α2. Besides the dominant characteristic L —→ K transitions, the strongly reduced bremsstrahlung (due to the low cooler voltage applied to the decelerated ions) allowed us to observe for the very first time RR transitions into the L shell as well as the balmer radiation located at the low energy part of the spectra.