Abstract
The magration and agglomeration of Helium atoms in He irradiated Cu was studied between 10 K and 900 K by perturbed γγ angular correlation (PAC) measurements using the radioactive probe atom111In. Trapping of interstitial and substitutional He atoms is observed already after irradiation at 10 K. Substitutional He (He-yacancy pair) is bound in the nearest neighbourhood to the111In probe atom and seems to be stable up to 725 K (EHe1V1b≥2.1 eV). The onset of vacancy assisted He agglomeration in Cu is observed at 250 K.
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