Abstract
Two systematic neutron irradiation experiments have been carried out in gold and copper to investigate the effect of cascade overlap on the damage structure evolution. One was the observation of the development of defect structure as a function of irradiation dose from 10 19 n/m 2 to 10 22 n/m 2. The other was a repeated irradiation and observation, in which an identical part of the specimen was observed after several irradiations, to obtain more direct information on the formation and evolution of defect structures from displacement cascade. Point defect clusters forming closely spaced groups, which are formed from displacement subcascades, have been confirmed. These closely spaced groups have revealed themselves by the survival of a larger number of vacancy clusters in the cascade with increasing irradiation dose by the effective annihilation of interstitials at defect clusters formed by previous irradiation.
Published Version
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