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Measurements of the lifetime for positron annihilation in metals show a temperature dependence which has been ascribed to the trapping of positrons at vacancies. An explanation of this trapping process is presented in terms of an effective potential well, whose depth is the difference between the bottom of the positron energy band in the solid and the potential felt by the positron inside the vacancy.
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C.H. Hodges (1970) studied this question.
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