Fluorescence and Coster-Kronig yields of the L1 shell in gadolinium

Using a Si(Li) x-ray spectrometer, we have measured the respective fractions of L-1, L-2, and L-3 x rays in the L x-ray spectrum emitted in the Tb-157-Gd-157 electron-capture decay. Using, in addition, our previously measured value for the ratio of L and K x rays, we deduce values for the fluorescence and Coster-Kronig yields of the L-1 subshell. These are omega(1)=0.101+/-0.005, f(12)=0.166+/-0.020, and f(13)=0.287+/-0.014. The f(12) and f(13) values are significantly below the predictions of the independent-particle model (IPM). The deduced L, level width of 3.7 eV is also significantly below the IPM width of 4.6 eV. [S1050-2947(98)01011-7].