Abstract
The differential elastic scattering cross sections of 145 keV gamma rays in Pb, Ta, Sn and Zr have been measured at angles ranging from 45 degrees and 115 degrees using a high-resolution lithium-drifted germanium detector. The experimental cross sections are compared with the available theoretical data. The present experimental results are in agreement with the theoretical results of Johnston et al. (1976) calculated using S-matrix theory of quantum electrodynamics. For medium- and low-Z elements the present experimental values are in agreement with the theoretical values compiled by Hubbell et al. (1975). At 45 degrees the experimental results for all elements are in agreement with the values calculated using Moilere's expression. The experimental results are in good agreement with the theoretical values of Smend et al. (1973) at all angles in high- and low-Z elements.
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