Eur. Phys. J. D 55, 23-33 (2009)
https://doi.org/10.1140/epjd/e2009-00208-4

Elastic scattering of 59.54-keV γ-rays in elements with 22 ≤ Z ≤ 92 at momentum transfer 0.4 ≤ x ≤ 4.7 Å^-1

Department of Physics, Panjab University, Chandigarh, 160 014, India

Corresponding author: ^a nsingh@pu.ac.in

Received: 27 November 2008
Revised: 14 May 2009
Published online: 17 July 2009

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.