Annihilation probability density in positron scattering by He

dc.creatorVarella, MTD
dc.creatorde Carvalho, CRC
dc.creatorLima, MAP
dc.creatorda Silva, EP
dc.date2001
dc.dateMAY
dc.date2014-11-15T17:56:33Z
dc.date2015-11-26T16:12:55Z
dc.date2014-11-15T17:56:33Z
dc.date2015-11-26T16:12:55Z
dc.date.accessioned2018-03-28T23:00:53Z
dc.date.available2018-03-28T23:00:53Z
dc.identifierPhysical Review A. American Physical Soc, v. 63, n. 5, n. art. no., n. 52705, 2001.
dc.identifier1050-2947
dc.identifierWOS:000168589100062
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/77586
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/77586
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/77586
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1267323
dc.descriptionWe have calculated annihilation probability densities in positron collisions against the I-Ie 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.
dc.description63
dc.description5
dc.descriptionart. no.
dc.description52705
dc.languageen
dc.publisherAmerican Physical Soc
dc.publisherCollege Pk
dc.publisherEUA
dc.relationPhysical Review A
dc.relationPhys. Rev. A
dc.rightsaberto
dc.sourceWeb of Science
dc.subjectSchwinger Multichannel Method
dc.subjectMolecules
dc.titleAnnihilation probability density in positron scattering by He
dc.typeArtículos de revistas


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