Three models for calculating positron annihilation rate in metals. | [Journal of Natural Sciences and mathematics • 2002]

Author(s):

1. O. M. Osiele: Physics Department, Federal University of Technology, Akure, Nigeria

2. I. A. Fuwape: Physics Department, Ogun State University, Ago-lwoye, Ogun State, Nigeria

3. I. A. Asaolu: Physics Department, Ogun State University, Ago-lwoye, Ogun State, Nigeria

Abstract:

Using the local density approximation and the perturbed hypernetted chain approximation, positron annihilation rate in some selected metals were calculated. The obtained results were in good agreement with the experimental results. The perturbed hypernetted chain approximation is modified in this paper by introducing a screening factor into the enhancement factor. Results obtained from the modified approximation followed a regular pattern, was in a very satisfactory agreement with experimental values for the alkaline and earth alkaline metals better than the other models and also in good agreement with experimental values for the transition metals showing that it could be used to predict positron annihilation rate in metals.

Page(s): 63-72

DOI: DOI not available

Published: Journal: Journal of Natural Sciences and mathematics, Volume: 42, Issue: 1, Year: 2002

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