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

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dc.creatorAdhikari, Sadhan K.
dc.creatorBiswas, P. K.
dc.date1999-11-23
dc.date.accessioned2026-07-07T12:17:05Z
dc.date.available2026-07-07T12:17:05Z
dc.descriptionThe scattering of ortho-positronium (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 ($n\ge 3$) 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 which compares well with the accurate value of -1.067 eV. The model leads to a singlet scattering length of 3.72$a_0$ and effective range of 1.67$a_0$, whereas the correlations suggest the precise values of $3.50a_0$ and 1.65$a_0$ for these observables, respectively.
dc.description7 latex pages, 6 postscript figures
dc.identifierhttps://arxiv.org/abs/physics/9911054
dc.identifierhttp://arxiv.org/abs/physics/9911054
dc.identifierPhys.Rev.A59:2058-2064,1999
dc.identifierdoi:10.1103/PhysRevA.59.2058
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/212007
dc.subjectAtomic and Molecular Clusters
dc.subjectCondensed Matter
dc.subjectNuclear Theory
dc.subjectAtomic Physics
dc.subjectChemical Physics
dc.titlePositronium-hydrogen-atom scattering in a five-state model
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