Abstract
Energy-resolved two-quantum annihilation in flight of positrons with energies ranging from 10 to 71.6 keV was observed. An energy-dispersive two-detector coincidence system was used to observe the sum and difference energies of the {gamma} rays from annihilating positron-electron pairs. For positrons penetrating carbon foils the c/v dependence of the annihilation cross section is confirmed. Spectra obtained from gold-coated carbon foils show evidence of in-flight annihilation with gold M-shell electrons. (c) 1999 The American Physical Society.
Highlights
The characteristic lifetime of the positron in a solid target is several 100 ps which is consistent with the observation that virtually all positrons annihilate with thermal kinetic energy
Annihilation spectroscopy based on the Doppler broadening of the annihilation line centered at m0c2 511 keV is a useful tool to obtain electron momentum distributions in single crystal solids and near defects [15]
The combination of a monochromatic variable-energy positron beam with the coincident observation of both annihilation quanta [16,17] permits the measurement of the total energy of the electron-positron pair with high energy resolution and excellent signal to noise ratio
Summary
Energy-Resolved Positron Annihilation in Flight in Solid Targets.
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