Positron annihilation and vacancy formation in Al
作者： G M Hood , R J Schultz
DOI: 10.1088/0305-4608/10/4/006
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摘要: High-precision measurements of the temperature dependence positron annihilation in Al, over range 290-930K, have been made via Doppler-broadening technique and using an internal 68Ge source. The results are considered mainly terms two lineshape parameters. These denoted L W describe, respectively, intensities well defined central wing portions a normalised photopeak area. Both exhibit characteristic, overall S-shaped temperature-dependence profile associated with change from free to vacancy-trapped modes. In detail, however, dependences quite distinct.
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