Abstract
Neutron diffraction spectra in which both high resolution ( ΔQ/ Q ≅ 0.003) and high intensity are maintained up to scattering vectors as high as 30 A ̊ −1 ( sin θ/λ = 2.5 ) have been obtained with the backscattering spectrometer (BSS) recently installed on the Harwell electron linac. The theory behind the spectrometer design is described, and it is shown how the above resolution requirement leads to its basic features of a 12 m incident flight path, a 2 m scattering flight path and a scattering angle (2 θ) acceptance from 165° to 175°. Examples of the resolution, intensity and background are given. It is shown that the problem of frame overlap may be overcome by using an absorbing filter.
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