dc.creatorde Carvalho, CRC
dc.creatorVarella, MTD
dc.creatorLima, MAP
dc.creatorda Silva, EP
dc.date2003
dc.dateDEC
dc.date2014-11-19T02:50:11Z
dc.date2015-11-26T17:56:31Z
dc.date2014-11-19T02:50:11Z
dc.date2015-11-26T17:56:31Z
dc.date.accessioned2018-03-29T00:40:09Z
dc.date.available2018-03-29T00:40:09Z
dc.identifierPhysical Review A. American Physical Soc, v. 68, n. 6, 2003.
dc.identifier1050-2947
dc.identifierWOS:000187885000054
dc.identifier10.1103/PhysRevA.68.062706
dc.identifierhttp://www.repositorio.unicamp.br/jspui/handle/REPOSIP/65423
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/65423
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/65423
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1291269
dc.descriptionWe present calculated elastic differential cross sections for positron-acetylene scattering, obtained by using the Schwinger multichannel method. Our results are in very good agreement with quasielastic experimental data of Kauppila [Nucl. Instrum. Meth. Phys. Res. B 192, 162 (2002)]. We also discuss the existence of a virtual state (zero-energy resonance) in e(+)-C2H2 collisions, based on the behavior of the integral cross section and of the s-wave phase shift. As expected the fixed-nuclei cross section and annihilation parameter (Z(eff)) present the same energy dependence at very low impact energies. As the virtual state energy approaches zero, the magnitude of both cross section and Z(eff) are extremely enhanced (at zero impact energy). The possibility of shifting from a low-lying virtual state to a shallow bound state is not expected to significantly affect room-temperature annihilation rates.
dc.description68
dc.description6
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.subjectMolecule Scattering
dc.subjectAnnihilation Dynamics
dc.subjectAtoms
dc.subjectGases
dc.subjectPolarizabilities
dc.subjectEnvironments
dc.subjectResonances
dc.subjectCo2
dc.titleElastic positron scattering by C2H2: Differential cross sections and virtual state formation
dc.typeArtículos de revistas


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