Abstract

The level widths and fluorescence yields of some atomic sub-shells were determined using L₁, L₂ and L₃ sub-shell fluorescence yields and linewidths of some L X-rays. For this measurement, the L_3l, L_3α, L_3β, L_2β, L_2γ, L_1β, L_1γ, L_β, L_γ, L_1x, L_2x and L_3x X-ray production cross sections in U and Th have been measured using the 59.5 keV incident photon energy. The measurements were performed using Am-241 radioisotopes as photon sources and a Si(Li) detector. The L X-rays are resolved with a new analytical method. The obtained L_3l, L_3α, L_3β, L_2β, L_2γ, L_1β, L_1γ, L_β, L_γ, L_1X, L_2X, and L_3X X-ray production cross sections were compared with the theoretical calculations using the most reliable theoretical values of L_i (i = 1, 2, 3) sub-shell photoionisation cross sections, fluorescence yields, X-ray emission rates and Coster–Kronig transition probabilities. The measured L_i, M_i and N_i sub-shell fluorescence yields were compared with the semi-empirical and theoretical values. Further, obtained level widths were compared with the other experimental and theoretical values. The results in the present paper are found to be in good agreement with calculated values.