An optimum geometry useful for scattering experiments and the design of a novel direct-beam stopper for a finite size source and detector have been described. Earlier attempts in this direction were made to obtain a surface of constant scattering angle ignoring the finite size of the source and the detector. Traditionally efforts have been made to minimize uncertainty in scattering angles by using very thin scatterers, although it has been found in this work that the uncertainty due to the finite size of the source and detector is large compared to that due to the finite thickness of the scatterer. We also found that the optimum scattering geometry is not necessarily symmetric about the source and the detector.
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