Annihilation Lifetime Spectroscopy Using Positrons from Bremsstrahlung Production

Abstract:

A new type of a positron annihilation lifetime spectroscopy (PALS) system has been set up at the superconducting electron accelerator ELBE [ at Helmholtz-Zentrum Dresden-Rossendorf. In contrast to existing source-based PALS systems, the approach described here makes use of an intense photon beam from electron bremsstrahlung which converts through pair production into positrons inside the sample under study. The article focusses on the production of intense bremsstrahlung using a superconducting electron linear accelerator, the production of positrons inside the sample under study, the efficient detector setup which allows for annihilation lifetime and Doppler-broadening spectroscopy simultaneously. Selected examples of positron annihilation spectroscopy are presented.

• Periodical: Defect and Diffusion Forum (Volume 331)
• Pages: 41-52
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.331.41
• Online since: September 2012
• Authors: Andreas Wagner, Wolfgang Anwand, Maik Butterling, Thomas E. Cowan, Fine Fiedler, Mathias Kempe, Reinhard Krause-Rehberg
• Keywords: Age-Momentum Correlation, Biological Samples, Bremsstrahlung, Bulk Sample, Fluids, Gases, Positron Annihilation Lifetime Spectroscopy (PALS), Pulsed Positron Source, Superconducting LINAC

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