The beat pattern produced by nuclear resonant scattering of synchrotron rad
iation scattered from two stainless steel foils in constant relative motion
has been measured at 3-ID beamline at the Advanced Photon Source. Contrary
to theoretical prediction and different from the result in glassy material
, the scattering in Bragg directions from single crystal of CoGa diffusiona
l smoothening of the quantum beats was absent within the statistical errors
.