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Type: Artigo de periódico
Title: Progress With The Schwinger Multichannel Method In Positron-molecule Scattering
Author: De Carvalho C.R.C.
Varella M.T.D.N.
Lima M.A.P.
Da Silva E.P.
Germano J.S.E.
Abstract: We report calculations for low-energy positron-C2H2 and -N2 scattering obtained through the Schwinger multichannel method (SMC). Integral and differential cross-sections and the annihilation parameter, Zeff, are presented. For nitrogen, evidence of a Ramsauer-Townsend minimum and the possibility of overcorrelation in the scattering configuration space are discussed. Annihilation probability densities (APD) calculated for He and H2 seem to bring indirect support to a model previously proposed to explain why acetylene, unlike nitrogen, presents very high low-energy annihilation rates.
Editor: Elsevier Science Publishers B.V., Amsterdam, Netherlands
Rights: fechado
Identifier DOI: 10.1016/S0168-583X(00)00036-7
Date Issue: 2000
Appears in Collections:Unicamp - Artigos e Outros Documentos

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