TY - JOUR A1 - Gumberidze, Alexandre A1 - Thorn, Daniel B. A1 - Surzhykov, Andrey A1 - Fontes, Christopher J. A1 - Banaś, Dariusz A1 - Beyer, Heinrich F. A1 - Chen, Weidong A1 - Grisenti, Robert Evaristo A1 - Hagmann, Siegbert A1 - Hess, Regina A1 - Hillenbrand, Pierre-Michel A1 - Indelicato, Paul A1 - Kozhuharov, Christophor A1 - Lestinsky, Michael A1 - Märtin, Renate A1 - Petridis, Nikolaos A1 - Popov, Roman V. A1 - Schuch, Reinhold A1 - Spillmann, Uwe A1 - Tashenov, Stanislav A1 - Trotsenko, Sergiy A1 - Warczak, Andrzej A1 - Weber, Günter A1 - Wen, Weiqiang A1 - Winters, Danyal Ferdinant Alexander A1 - Winters, Natalya A1 - Yin, Zhong A1 - Stöhlker, Thomas T1 - Angular distribution of characteristic radiation following the excitation of He-like uranium in relativistic collisions T2 - Atoms N2 - In this paper, we present an experimental and theoretical study of excitation processes for the heaviest stable helium-like ion, that is, He-like uranium occurring in relativistic collisions with hydrogen and argon targets. In particular, we concentrate on angular distributions of the characteristic Kα radiation following the K → L excitation of He-like uranium. We pay special attention to the magnetic sub-level population of the excited 1s2lj states, which is directly related to the angular distribution of the characteristic Kα radiation. We show that the experimental data can be well described by calculations taking into account the excitation by the target nucleus as well as by the target electrons. Moreover, we demonstrate for the first time an important influence of the electron-impact excitation process on the angular distributions of the Kα radiation produced by excitation of He-like uranium in collisions with different targets. KW - highly-charged ions KW - X-rays KW - storage rings KW - relativistic collisions KW - excitation Y1 - 2021 UR - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/62140 UR - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-621401 SN - 2218-2004 N1 - This work was supported by the Helmholtz Alliance Program of the Helmholtz Association, contract HA216/EMMI “Extremes of Density and Temperature: Cosmic Matter in the Laboratory”. The work of C.J. Fontes was supported by the U.S. Department of Energy through the Los Alamos National Laboratory, which is operated by Triad National Security, LLC, for the National Nuclear Security Administration of U.S. Department of Energy (Contract No. 89233218CNA000001). S.T. was supported by Deutsche Forschungsgemeinschaft (DFG), contract TA 740 1-1. This work was supported by SPbSU-DFG (Grants No. 11.65.41.2017 and No. STO 346/5-1). R.V.P. acknowledges also the financial support from the Foundation for the advancement of theoretical physics and mathematics “BASIS”. VL - 9 IS - 2, art. 20 SP - 1 EP - 11 PB - MDPI CY - Basel ER -