Abstract
Measurements of the angular correlation of positron annihilation radiation from neutron-irradiated copper crystals showed a distinct enhancement of the peak counting rate as a function of dose between 10 16 – 10 19 nvt (number density of neutrons × velocity × time). A comparison with the predictions of the trapping model shows that if the trapping rate for dislocation loops is assumed to be smaller than that for straight dislocations, the data are compatible with determinations of defect densities from electron microscopy.
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