Differential cross-section measurements for inelastic scattering of 22.1 keV photons by elements with 4⩽ Z⩽69

Abstract

Inelastic scattering differential cross-sections for the 22.1 keV photons have been measured in Be, C, Mg, Al, S, Ti, Fe, Cu, Zn, As, Se, Y, Zr, Ag, In, Sn, Te, Gd, Dy, Ho and Tm elements at an angle of 133°. The measurements were performed under vacuum using an annular source of 109 Cd radioisotope as photon source and a planar HPGe detector. The measured inelastic scattering cross-sections are compared with those calculated using the Klein–Nishina cross-section for Compton scattering by stationary free electrons and the non-relativistic Hartree–Fock incoherent-scattering function. A good agreement is found for all the elements under investigation except for 39 Y ( B K=17.038 keV) and 40 Zr ( B K=17.998 keV) elements, where the measured cross-sections are ∼25% lower than the calculated ones; B K is the K-shell binding energy of the element.