Publication: Energy-Resolved Positron Annihilation in Flight in Solid Targets
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Date
1999
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American Physical Society (APS)
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Weber, M. H., A. W. Hunt, J. A. Golovchenko, and K. G. Lynn. 1999. Energy-Resolved Positron Annihilation in Flight in Solid Targets. Physical Review Letters 83, no. 22: 4658–4661. doi:10.1103/physrevlett.83.4658.
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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 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.
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