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 ma...

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Veröffentlicht in:	Journal of physics. B, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2006-04, Vol.39 (7), p.1647-1668
Hauptverfasser:	Dunlop, L J M, Gribakin, G F
Format:	Artikel
Sprache:	eng
Schlagworte:	Atomic and molecular collision processes and interactions Atomic and molecular physics Exact sciences and technology Physics Positron scattering
Online-Zugang:	Volltext
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Beschreibung
Zusammenfassung:	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.
ISSN:	0953-4075 1361-6455
DOI:	10.1088/0953-4075/39/7/008