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Many-body theory of gamma spectra from positron-atom annihilation

A many-body theory approach to the calculation of gamma spectra of positron annihilation on many-electron atoms is developed. We evaluate the first-order correlation correction to the annihilation vertex and perform numerical calculations for the noble gas atoms. Extrapolation with respect to the maximal orbital momentum of the intermediate electron and positron states is used to achieve convergence. The inclusion of correlation corrections improves agreement with experimental gamma spectra.

preprint2005arXivOpen access
L. J. M. DunlopG. F. Gribakin
physics.atom-phcond-mat.mtrl-sci
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L. J. M. DunlopG. F. Gribakin

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