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Zusammenfassung:
Bound-state transitions in few-electron, heavy ions following radiative electron capture are studied within the framework of the density matrix theory and the multiconfiguration Dirac-Fock approach. Special attention is paid to the Kα1 (1s1/22p3/2 1,3PJ=1,2-->1s1/22 1SJ=0) radiative decay of heliumlike uranium U90+ projectiles. This decay has recently been observed at the GSI facility in Darmstadt, giving rise to a surprisingly isotropic angular distribution, which is inconsistent with previous experiments and calculations based on a "one-particle" model. We show that the unexpected isotropy essentially results from the mutual cancellation of the angular distributions of the 1P1-->¹S₀ electric dipole and ³P₂-->¹S₀ magnetic quadrupole transitions, both of which contribute to the Kα₁ radiation. Detailed computations on the anisotropy of the Kα₁ radiation have been carried out for a wide range of projectile energies and are compared to available experimental data.
