Phys. Rev. Lett. 83, 4658–4661 (1999)Energy-Resolved Positron Annihilation in Flight in Solid TargetsReceived 28 June 1999; published in the issue dated 29 November 1999 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 γ 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. © 1999 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.83.4658
DOI:
10.1103/PhysRevLett.83.4658
PACS:
78.70.Bj, 14.60.-z, 24.80.+y, 25.30.Hm
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