Dresden 2013 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 75: Anwendungen kernphysikalischer Methoden
HK 75.2: Gruppenbericht
Donnerstag, 7. März 2013, 17:15–17:45, HSZ-204
Positron Annihilation Spectroscopy at a Superconducting Electron Accelerator — •Andreas Wagner1, Wolfgang Anwand1, Maik Butterling1, Thomas E. Cowan1,2, Fine Fiedler1, Fabian Fritz1,2, Marco Jungmann3, Mathias Kempe1,2, and Reinhard Krause-Rehberg3 — 1Inst. für Strahlenphysik, Helmholtz-Zentrum Dresden-Rossendorf, D-01328 Dresden — 2Inst. für Kern- und Teilchenphysik, Technische Univ. Dresden, D-01069 Dresden — 3Inst. für Physik, Martin-Luther Univ., D-06099 Halle
High-power superconducting linear electron accelerators allow producing a variety of secondary beams. At the Helmholtz-Zentrum Dresden-Rossendorf a 40 MeV superconducting electron accelerator is operated at beam currents up to 1.6 mA in continous-wave mode delivering neutrons from photo-production off lead, tunable coherent laser light from free-electron lasers, intense Bremsstrahlung for nuclear (astro-) physics, and positrons from pair production. New developments now enable for the first time positron annihilation lifetime experiments in bulk materials, fluids, gases and organic tissue. A 3-D tomographic annihilation lifetime imaging systems has been developped for new classes of experiments for quantitative and qualitative crystal-defect characterizations, chemsitry of positronium in insulators and porous materials. Some recent applications will be presented.