MEASUREMENTS OF ANOMALOUS ELASTIC-SCATTERING OF 59.54-KEV PHOTONS

Coherent scattering cross sections of 59.54-keV photons on target foil s of Gd-64, Dy-66, Er-68, Yb-70, Hf-72, and Ta-73 at 60 degrees, 90 de grees, and 120 degrees have been measured to provide information on th e region of K anomalous elastic scattering. The results are compared w ith the values calculated by the second perturbative order S matrix an d by two procedures based on the form-factor approximation corrected b y the anomalous scattering factors. Agreement of the S matrix values i s very satisfactory, on the whole, and that of the values given by the form-factor approximations is fairly good.