Experimental determination of the energy dependence of defect production |
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Authors: | K.L. Merkle Wayne E. King A.C. Baily K. Haga M. Meshii |
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Affiliation: | Argonne National Laboratory, Argonne, IL 60439, USA;Northwestern University, Evanston, IL 60201, USA |
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Abstract: | A knowledge of primary damage production as a function of recoil energy is essential for predicting defect production in radiation environments of practical interest. The damage function , i.e., the number of Frenkel pairs as a function of recoil energy, is determined for Cu from electron and ion damage-rate measurements. shows a plateau at which extends up to ~ . Therefore, simple damage models, such as the modified Kinchin-Pease expression, are strongly deficient, not only at high recoil energies where stimulated recombination in cascades reduces defect production, but also in the single displacement regime. As a consequence, no simple relation between and is expected to exist. A procedure is suggested which uses anisotropy measurements in combination with polycrystal electron and ion irradiations to construct absolute damage functions in metals. |
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