UBC Theses and Dissertations
Positron-atom interaction Pai, David Mieng
Any attempt to describe accurately the life time of positrons in atoms or the low energy phase shifts for positron-atom scattering relies on an adequate treatment of electron-positron correlations. In this thesis, an interaction model which treats such correlations is presented. This model has other desirable features. It is non-phenomenologlcal, amenable to calculation even for complicated atoms, and applicable to calculations of both bound and scattering states of positron. Following the presentation of the theoretical aspect of this model, methods which can be used to carry out the prescribed calculations are discussed. At the end of this thesis, results obtained from applying this model to positron-helium system axe presented. In particular, the calculated total elastic scattering cross sections are compared with experimental measurements.
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