['Discovering', 'that', 'both', 'the', 'vacancy', 'and', 'interstitial', 'defect', 'migration', 'pathways', 'are', 'confined', 'to', 'Ga', '-', 'free', 'regions', 'suggests', 'changes', 'in', 'recombination', 'rates', 'of', 'isolated', 'vacancy', '-', 'interstitial', 'pairs', 'in', 'comparison', 'to', 'pure', 'Pu', '.']