Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/72429
Type: Artigo de periódico
Title: The Schwinger multichannel method (SMC) calculations for Z(eff) were off by a factor of Z
Author: Varella, MTD
de Carvalho, CRC
Lima, MAP
Abstract: Our previously reported Z(eff) values were in accidental agreement with experiment. They were actually underestimated by a factor of Z. In order to full understand the nature of the discrepancies with experimental data, we carried out several tests for positron-He collisions. We first tried many different (Cartesian Gaussian) basis sets in a single-excitation configuration-interaction (CI) framework. Then, we included single- and double-excitations of the target in the CI expansion (CISD) of the scattering wave function. Finally, we tried to mimic the virtual positronium cusp. It seems that cusp description should indeed be further improved. (C) 2002 Elsevier Science B.V. All rights reserved.
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/S0168-583X(02)00873-X
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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