Frankfurt 2006 – scientific programme
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A: Atomphysik
A 2: Elektronenstreuung und -rekombination
A 2.5: Talk
Monday, March 13, 2006, 15:00–15:15, H6
Multipole mixing and correlation effects on the radiative electron capture by highly-charged, few-electron ions — •Andrey Surzhykov1, Ulrich D. Jentschura1, Thomas Stöhlker2, and Stephan Fritzsche3 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 2Gesellschaft für Schwerionenforschung (GSI), Darmstadt, Germany — 3Universität Kassel, Kassel, Germany
During the last two decades, the radiative capture of free or quasi–free electrons (REC) into the bound states of high–Z ions has been intensively studied at the GSI storage ring ESR in Darmstadt. While, however, most experiments in the past have dealt with the bare projectiles, more recent interest is focused also on the electron capture into few–electron ions. For the latter, interelectronic interaction effects should be taken into account. Recently, for example, REC into the L–shell of (initially) hydrogen–like uranium ions U91+ and their subsequent Kα radiative decay have been observed [1]. The angular distribution was found to contradict expectations from a one–particle models. — Consequently, in this contribution, we present a density matrix formalism for the description of radiative electron capture into excited states of heavy, few–electron ions and their subsequent decay, including many-electron effects and higher-order multipoles of the radiation field. A priori, this formalism neither depends on the number of electrons nor on the shell structure of the ions, but due to the experimental interest, strong emphasis will be laid on detailed calculations for the L– and M–REC of (initially) hydrogen–like and lithium–like uranium ions for a wide range of projectile energies.
[1] A. Gumberidze et al., Hyperfine Interactions 146/147, 133 (2003).