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Search for positron quasibound states in the doubly excited region of the helium atom

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dc.contributor.authorMachacek, Joshua
dc.contributor.authorBoadle, Roisin
dc.contributor.authorBuckman, Stephen
dc.contributor.authorSullivan, James
dc.date.accessioned2015-12-08T22:16:19Z
dc.date.issued2012
dc.date.updated2016-02-24T11:25:19Z
dc.description.abstractRecent calculations by Bromley have indicated that the He(2s21Se) state will bind a positron. The e+He(2s21Se) state has a binding energy of 0.447 eV with respect to the He(2s21Se) state. Binding of a positron to the He 2s2 state has been predicted to give rise to two resonances in positron scattering from ground-state helium: e+He(2s21Se) at 57.3716 eV and a 2Po shape resonance just above the He(2s21Se) threshold at 57.8485 eV. To investigate these predicted resonances, low-energy positron scattering experiments were performed to measure the total and positronium cross sections in the doubly excited region of helium in this energy region. No experimental evidence has been found for these resonances, but upper bounds on the resonance strength were determined for both predicted resonances.
dc.identifier.issn1050-2947
dc.identifier.urihttp://hdl.handle.net/1885/30604
dc.publisherAmerican Physical Society
dc.rightsAuthor/s retain copyrighten_AU
dc.sourcePhysical Review A: Atomic, Molecular and Optical Physics
dc.subjectKeywords: Energy regions; Experimental evidence; Ground-state helium; Helium atom; Positron scattering; Quasi-bound state; Resonance strengths; Shape resonance; Upper Bound; Binding energy; Electrons; Helium; Resonance; Positrons
dc.titleSearch for positron quasibound states in the doubly excited region of the helium atom
dc.typeJournal article
dcterms.accessRightsOpen Accessen_AU
local.bibliographicCitation.issue6
local.bibliographicCitation.startpage3
local.contributor.affiliationMachacek, Joshua, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationBoadle, Roisin, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationBuckman, Stephen, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationSullivan, James, College of Physical and Mathematical Sciences, ANU
local.contributor.authoruidMachacek, Joshua, u4737779
local.contributor.authoruidBoadle, Roisin, u5058108
local.contributor.authoruidBuckman, Stephen, u8300485
local.contributor.authoruidSullivan, James, u3551013
local.description.notesImported from ARIES
local.identifier.absfor020201 - Atomic and Molecular Physics
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciences
local.identifier.ariespublicationu4860843xPUB75
local.identifier.citationvolume86
local.identifier.doi10.1103/PhysRevA.86.064702
local.identifier.scopusID2-s2.0-84870602605
local.identifier.thomsonID000311909800010
local.type.statusPublished Version

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