Positronium-hydrogen-atom scattering in a five-state model

dc.contributor.authorAdhikari, S. K.
dc.contributor.authorBiswas, P. K.
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T14:06:45Z
dc.date.available2014-05-20T14:06:45Z
dc.date.issued1999-03-01
dc.description.abstractThe scattering of orthopositronium (Ps) by hydrogen atoms has been investigated in a five-state coupled-channel model allowing for Ps(1s)H(2s,2p) and Ps(2s,2p)H(1s) excitations using a recently proposed electron-exchange model potential. The higher (n greater than or equal to 3) excitations and ionization of the Ps atom are calculated using the first Born approximation. Calculations are reported of scattering lengths, phase shifts. elastic, Ps and H excitation, and total cross sections. Remarkable correlations are observed between the S-wave Ps-H binding energy and the singlet scattering length, effective range, and resonance energy obtained in various model calculations. These correlations suggest that if a Ps-H dynamical model yields the correct result for one of these four observables, it is expected to lead to the correct result for the other three. The present model, which is constructed so as to reproduce the Ps-H resonance at 4.01 eV, automatically yields a Ps-H bound state at - 1.05 eV that compares well with the accurate value of - 1.067 eV. The model leads to a singlet scattering length of 3.72a(0) and effective range of 1.67a(0), whereas the correlations suggest the precise values of 3.50a(0) and 1.65a(0) for these observables, respectively. [S1050-2947(99)07703-3].en
dc.description.affiliationUniv Estadual Paulista, Inst Fis Teor, BR-01405900 São Paulo, Brazil
dc.description.affiliationUnespUniv Estadual Paulista, Inst Fis Teor, BR-01405900 São Paulo, Brazil
dc.format.extent2058-2064
dc.identifierhttp://dx.doi.org/10.1103/PhysRevA.59.2058
dc.identifier.citationPhysical Review A. College Pk: American Physical Soc, v. 59, n. 3, p. 2058-2064, 1999.
dc.identifier.doi10.1103/PhysRevA.59.2058
dc.identifier.fileWOS000079233200047.pdf
dc.identifier.issn1050-2947
dc.identifier.lattes8031087349809439
dc.identifier.urihttp://hdl.handle.net/11449/23444
dc.identifier.wosWOS:000079233200047
dc.language.isoeng
dc.publisherAmerican Physical Soc
dc.relation.ispartofPhysical Review A
dc.relation.ispartofsjr1,288
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titlePositronium-hydrogen-atom scattering in a five-state modelen
dc.typeArtigo
dcterms.licensehttp://publish.aps.org/authors/transfer-of-copyright-agreement
dcterms.rightsHolderAmerican Physical Soc
unesp.author.lattes8031087349809439
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Física Teórica (IFT), São Paulopt

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