A study of incoherence scattering at 279 keV gamma ray energy in elements Ni, Zn, Ag, Cd, In, Sn and Pb

The differential elastic-to-inelastic gamma-ray scattering ratios have been measured at 60deg in the atomic number region 13 ≤ Z ≤ 82 for pure elements using 59.54 keV radiation from a 241Am source. The ratios of these cross sections which can be determined with higher precision than absolute values is given. The results have been compared with theoretical cross section ratios based on S-matrix calculations for elastic scattering and incoherent scattering function method for inelastic scattering. A good agreement is obtained between theory and experiment within experimental errors although the experimental ratios are consistently higher than the theoretical values. The Z-dependence of the ratios has been investigated by least square method and the exponent of Z is found to be 1.75 for experimental ratios and 1.76 for theoretical ones. (author). 5 refs., 2 figs., 1 tab