Many-body theory of positron-atom interactions

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dc.creatorGribakin, G. F.
dc.creatorLudlow, J.
dc.date2004-03-24
dc.date.accessioned2026-07-07T06:36:55Z
dc.date.available2026-07-07T06:36:55Z
dc.descriptionA many-body theory approach is developed for the problem of positron-atom scattering and annihilation. Strong electron-positron correlations are included non-perturbatively through the calculation of the electron-positron vertex function. It corresponds to the sum of an infinite series of ladder diagrams, and describes the physical effect of virtual positronium formation. The vertex function is used to calculate the positron-atom correlation potential and nonlocal corrections to the electron-positron annihilation vertex. Numerically, we make use of B-spline basis sets, which ensures rapid convergence of the sums over intermediate states. We have also devised an extrapolation procedure that allows one to achieve convergence with respect to the number of intermediate-state orbital angular momenta included in the calculations. As a test, the present formalism is applied to positron scattering and annihilation on hydrogen, where it is exact. Our results agree with those of accurate variational calculations. We also examine in detail the properties of the large correlation corrections to the annihilation vertex.
dc.description25 pages, 16 figures
dc.identifierhttps://arxiv.org/abs/physics/0403114
dc.identifierhttp://arxiv.org/abs/physics/0403114
dc.identifierPhys. Rev. A 70, 032720 (2004)
dc.identifierdoi:10.1103/PhysRevA.70.032720
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/100246
dc.subjectAtomic Physics
dc.subjectMaterials Science
dc.titleMany-body theory of positron-atom interactions
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