Elastic scattering of sf{59.54}-keV sf{gamma}-rays in elements with sf{22leq {Z} leq {92}} at momentum transfer sf{0.4 leq {x} leq 4.7~{AA}^{sf -1}} |
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Authors: | S. Kumar V. Sharma J. S. Shahi D. Mehta N. Singh |
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Affiliation: | 1. Department of Physics, Panjab University, Chandigarh, 160 014, India
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Abstract: | Differential cross sections for elastic scattering of the 59.54 keV γ-rays in elements with 22 ≤Z ≤92 have been measured over the angular range 10○–160○corresponding to the momentum transfer 0.4 ≤x ≤4.7 Å-1. The measurements at forward and backward angles were performed using the 241Am radioactive point-source, target and the Ge detectors in the transmission and reflection arrangements, respectively. The measured differential scattering cross sections are compared with those based on the form-factor (FF) formalism and state-of-the-art S-matrix calculations to differentiate between their relative efficacies and to check angular-dependence of the anomalous scattering factors (ASF) incorporated as correction to the modified form-factor (MF). The S-matrix values exhibit agreement with the measured data at backward angles and differences ~10% at forward angles. The scattering cross sections based on the MF including ASF’s are in general lower at various angles by up to 20% for medium- and high-Z elements. The observed deviations being higher at the forward angles infer possibility of angular-dependence of ASF’s. |
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