(200), (111) AND (311) neutron diffraction peaks were measured on polycrystalline Cu samples with varying degrees of deformation by compression: O%. 0.8%. 1.2%,, 1.5% and 2%. The first two reflections were measured with wavelength 2.358Å and the third one with wavelength 1.55Å.

Integrated intensities vary more less monotonically and they tend to reach the kinematical value. This limit was estimated by extrapolation and used to evaluate extinction. To obtain dislocation densities a simple model was proposed which divides the crystal in regions of perfect periodicity and regions perturbed by dislocations, and evaluates the integratedintensity from perfect regions by the general theory of X-Ray diffraction of Zachariasen (1967).

Dislocation densities result between 1.2×1O7 cm−2 for the sample without deformation, and approximately 5.0×1O7 cm−2 for the 2%. deformed sample. These results are in the expected range.