Positron lifetimes and lineshape factors in deformed copper |
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Authors: | C Dauwe M Dorikens L Dorikens-Vanpraet D Segers |
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Institution: | 1. Rijksuniversiteit Gent, Natuurkundig Laboratorium, I.N.W., Proeftuinstraat, 86, B-9000, Gent, Belgium
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Abstract: | Measurements of positron annihilation lifetime and lineshape factors in deformed OFHC copper, for 14 different pairs of specimen, ranging up to 66% deformation, are discussed. The influence of annihilation in the source is carefully examined and the data are consequently corrected. The lifetime varies from (124±2) ps for annealed copper to (179±2) ps for dislocation saturated samples. Trapping cross sections and trapping efficiencies are calculated. The possibility of interference of vacancies formed during the deformation is discussed. |
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