T. Stöhlker,
C. Kozhuharov,
P. H. Mokler,
A. Warczak,
F. Bosch,
H. Geissel,
R. Moshammer,
C. Scheidenberger,
J. Eichler,
A. Ichihara,
T. Shirai,
Z. Stachura,
and P. Rymuza

Phys. Rev. A,

**Radiative Electron-Capture Studied in Relativistic Heavy-Ion Atom Collisions**Phys. Rev. A,

**51**:2098 (March 1995)## Abstract:

The process of radiative electron capture (REC) in relativistic collisions of high-Z ions with low-Z gaseous and solid targets is studied experimentally and theoretically. The observed x-ray spectra are analyzed with respect to photon angular distributions as well as to total K-REC cross sections. The experimental results for angle-differential cross sections are well reproduced by exact relativistic calculations which yield significant deviations from standard sin^2(θ) distributions. Total cross sections for K-REC are shown to follow a simple scaling rule obtained from exact relativistic calculations as well as from a nonrelativistic dipole approximation. The agreement between these different theoretical approaches must be regarded as fortuitous, but it lends support to the use of the nonrelativistic approach for practical purposes.