Abstract
Low-energy intense positron beams derived from pair production can be made at high-energy electron linacs and such beams are in operation or under installation at several linac facilities. Using a pulsed position beam made at a 100 MeV electron linac, we have measured the intensity and velocity distribution of positronium emitted from materials by measuring the time-of-flight of annihilating positronium. The time-of-flight data are augmented by positron lifetime and angular correlation measurements performed with the beam. Positronium spectra have been measured for a number of metallic samples. Several new observations have been made including details of the energy distribution of positronium emission formed by a thermalized positron and a conduction electron and the production of positronium from energetic positrons scattered out of the sample.
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This paper is based upon an invited talk given by R.H.H. at the International Symposium “Production of Low-Energy Positrons with Accelerators and Applications” Justus-Liebig-Universität Giessen, FRG (25–27 September, 1986)
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Howell, R.H., Rosenberg, I.J. & Fluss, M.J. Production and use of low-energy, monoenergetic positron beams from electron LINACS. Appl. Phys. A 43, 247–255 (1987). https://doi.org/10.1007/BF00635179
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DOI: https://doi.org/10.1007/BF00635179