Please use this identifier to cite or link to this item: http://www.repositorio.ufc.br/handle/riufc/46427
Title in Portuguese: Annihilation probability density in positron scattering by He
Title: Annihilation probability density in positron scattering by He
Author: SILVA, Euclimar Passos da
Keywords: annihilation probability
Issue Date: 13-Apr-2001
Publisher: The American Physical Society
Citation: DA SILVA, E. P.
Abstract: We have calculated annihilation probability densities in positron collisions against the He atom. Our scattering wave functions were obtained with the Schwinger multichannel method [J. S. E. Germano and M. A. P. Lima, Phys. Rev. A 47 , 3976 (1993)]. It has been found that direct annihilation, in which electronic cloud deformation shields the nuclear repulsive potential effectively attracting the positron to a binary encounter, dominates the annihilation process at low impact energies. Closer to the real positronium formation threshold, the signature of virtual positronium has been noticed. At room temperature, significant annihilation probability has been observed over a somewhat extended region.
Description: SILVA, E. P. Annihilation probability density in positron scattering by He. 2001.Artigo. Phys. Rev., 13 April 2001.
URI: http://www.repositorio.ufc.br/handle/riufc/46427
metadata.dc.type: Artigo de Periódico
Appears in Collections:CSOBRAL - Artigos publicados em revistas científicas

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