Elastic and Inelastic Scattering of Gamma Rays from V3Si

Abstract

The elastic and inelastic components of y-ray scattering from a non-transforming VaSi single crystal have been measured using a 57CO Mossbauer source and resonant absorber. The system places an upper limit of ± 4 x 10 - 8 e V on the possible energy transfer which distinguishes inelastic from elastic scattering. The scattering at the (440) Bragg reflection with q = 0 and q - 0·1 A -1 has been measured as a function of temperature for two orthogonal orientations of the crystal. Anomalous changes in the elastic and inelastic intensities have been observed. It is suggested that these changes are associated respectively with central mode and soft mode aspects of the dynamics of the vanadium atoms.