NASA Technical Reports Server (NTRS) : Positronium pdf

NASA Technical Reports Server (NTRS) : Positronium

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Description of the Book:

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

• Creator/s: NASA Technical Reports Server (NTRS
• Date: 1/1/2011
• Year: 2011
• Book Topics/Themes: NASA Technical Reports Server (NTRS), POSITRONIUM, ELECTRON SCATTERING, COULOMB POTENTIAL, ELECTRONS, HELIUM, SCATTERING, DISPERSION, DiRienzi, Joseph

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