Session Q1: Poster Session III (4:00 pm - 6:00 pm)
4:00 PM–4:00 PM, Thursday, June 16, 2011
Room: Atrium Ballroom BC
Abstract ID: BAPS.2011.DAMOP.Q1.86
Abstract: Q1.00086 : Positronium and electron scattering on Helium
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Abstract 
Authors:
Joseph Di Rienzi
(College of Notre Dame of Maryland)
Richard Drachman
(NASA/Goddard Space Flight Center)
A recent work [1] establishes experimentally that Positronium scattering by atoms of various elements is surprisingly close in total cross-section to that of an isolated electron of the same velocity. In this work we will look at the scattering of Ps on Helium and compare it to a determination of the scattering of an e- with the same element. For both the Ps scattering and the e- scattering on He, we assume the symmetrization of the e- with the closed shell He electrons is the dominant interaction. A local effective potential employed in [2] and [3] is used to model the electron exchange and cross- sections are determined for a set of partial waves. For the Ps scattering we include as a secondary effect the Van der Waals interaction. For single e- scattering of He, we also employ a short range Coulomb potential and dispersion as contributing effects. Results of the cross-sections determined in each case are then compared. \\[4pt] [1] S. J. Bromley, S. Armitage, J. Beale, D. E. Leslie, A. I. Williams, G. Laricchia, Science 330, 789 (2010)\\[0pt] [2] R. J. Drachman, S.K. Houston, J. Phys. B: At. Mol. Phys. 3 1657 (1970)\\[0pt] [3] J. Di Rienzi, R. J. Drachman, J. Phys. B. 36 2409 (2003)
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.DAMOP.Q1.86