MAGNETIC-QUADRUPOLE-ELECTRIC-DIPOLE MIXING IN L3 X-RAY TRANSITIONS OF HEAVY-ELEMENTS

The angular distribution of L3 x rays of Th and U ionized by 1.5-MeV protons has been measured and the anisotropy parameters of these lines have been deduced. The ratios of the anisotropy parameters of the different L3 lines were found to disagree with the theoretical predictions. For U, the alignment of the L3 subshell has been determined from the angular distribution of the L±2 line, and from the measured anisotropy of the other L3 x-ray lines the magnetic-quadrupoleelectric-dipole mixing ratios were deduced. The experimental mixing ratios for the ns1/2-2p3/2 transitions are significantly larger than the theoretical values. © 1990 The American Physical Society.