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Abstract
Stage III and stage IV recovery have been investigated resistometrically following 6·1 MeV alpha-particle irradiation at 4·2 K. The activation energy associated with stage III shows a gradual increase from 0·35+0·02 eV to 0·39±0·02eV. Stage IV (155 to 180 K) is associated with an activation energy of 0·46±0·03 eV. The present results are compared with those obtained after electron and neutron irradiation. The stage III recovery kinetics are interpreted in terms of the Gösele—Seeger theory for interstitial migration in highly anisotropic hexagonal metals. Stage IV is ascribed to monovacancy migration.