Publisher: Bachudo Science Co. Ltd

Models For Calculating Position Annihilation Rates In Solids

M. O. Osiele, I. A. Fuwape, I. A. Asaolu
KEYWORDS: Positron, annihilation rate, Screening and Metals.

ABSTRACT:

The local density approximation and the perturbed hypernetted chain approximation have been used to calculate the positron annihilation rate in some metals. Comparism of the theoretical techniques with experimental results shows that the two approximations agree with experiment for simple metals while the local density approximation agree better with experiments for transition metals. The perturbed hypernctted chain approximation is modilied in this paper by consilkring the effects of electron-positron screening on the electron-positron)lllll1hilation rate. Results obtained from the modi lied model arc in good agreement with experimental results for the alkaline, earth - alkaline and transition elements.


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