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Keywords:

  • Debye–Scherrer rings;
  • gravity;
  • long wavelengths;
  • scattering vectors;
  • small-angle neutron scattering

Gravity distorts the circular contours found for small-angle neutron scattering data from azimuthally symmetric scattering systems when taken at long wavelength and with large wavelength spreads. The resolution is calculated for a Debye–Scherrer ring and compared with results from measurements taken on a sample of opal.