The L(gamma 1,5), L(gamma 2,3,(6)), L(gamma 4), and L alpha x-ray fluorescence cross sections for the elements with 71<=Z<=83 at 22.6 keV

The L(gamma 1,5), L(gamma 2,3,(6)), L(gamma 4), and L alpha x-ray fluorescence (XRF) cross sections for 11 elements with 71 less than or equal to Z less than or equal to 83 have been measured at 22.6 keV incident photon energy. The measured values have been interpreted in terms of theoretical L(i) (i=1,2,3) subshell photoelectric cross sections, fluorescence and Coster-Kronig yields, and radiative transition probabilities. A fairly good agreement is found between the measured and theoretical cross sections for the L alpha and L(gamma 1,5) x rays. In the case of the L(gamma 2,3(6)) and L(gamma 4) XRF cross sections, the measured values are in agreement with the theoretical ones for elements Z=71-74 and are higher by up to 55% for elements with Z greater than or equal to 75. The L(1) subshell fluorescence yields (omega(1)), deduced from these cross sections, are found to vary smoothly with atomic number rather than exhibiting a big jump at Z=75 due to the onset of intense L(1)-L(3)M(5) Coster-Kronig transition as predicted by the relativistic Dirac-Hartree-Slater model.