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

Abstract

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.

25 pages, 9 figures, submitted to J. Phys. B

References in corpus (1)

• Many-body theory of positron-atom interactions

Cited by in corpus (16)

• Positron-molecule interactions: resonant attachment, annihilation, and bound states
• Positron scattering and annihilation on noble gas atoms
• $\gamma$-ray spectra and enhancement factors for positron annihilation spectra with core-electrons
• Calculations of positron binding and annihilation in polyatomic molecules
• Convergence of CI single center calculations of positron-atom interactions
• Positron scattering and annihilation in hydrogen-like ions
• Many-body theory for positronium-atom interactions
• Effect of chlorination on positron binding to hydrocarbons: experiment and theory
• Effect of positron-atom interactions on the annihilation gamma spectra of molecules
• Gamma-ray spectra of methane in the positron-electron annihilation process
• Docking positrophilic electrons into molecular attractive potential of fluorinated methanes
• Probing positron cooling in noble gases via annihilation $\gamma$ spectra
• Exchange assisted tunneling and positron annihilation on inner atomic shells
• Ab initio QED treatment of the two-photon annihilation of positrons with bound electrons
• An alternative indicator of annihilated electrons in atoms: Rahm's electronegativity scale
• Gamma -ray spectra in the positron-annihilation process of molecules at room temperature