Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf
Positron-Annihilation Lifetime Spectroscopy using Electron Bremsstrahlung
Wagner, A.; Anwand, W.; Butterling, M.; Cowan, T. E.; Fiedler, F.; Fritz, F.; Kempe, M.; Krause-Rehberg, R.
A new type of an intense source of positrons for materials research has been set up at the superconducting electron linear. The source employs hard X-rays from electron-bremsstrahlung production generating energetic electron-positron pairs inside the sample under investigation. CW-operation allows performing experiments with significantly reduced pile-up artefacts in the detectors compared to pulsed mode operation in conventional accelerators. The high-resolution timing of the accelerator with bunch lengths below 10 ps full width at half maximum (FWHM) allows positron annihilation lifetime spectroscopy (PALS) measurements with high time resolution. A single-component annihilation lifetime of Kapton has been measured as (381.3 ± 0.3) ps. Employing segmented detectors for the detection of both annihilation photons allows for the first time to perform a 4D tomographic reconstruction of the annihilation sites including the annihilation lifetime.
Keywords: positrons materials research ELBE linac superconducting tomography
- DOI: 10.17815/jlsrf-2-58 is cited by this (Id 22147) publication
Journal of Physics: Conference Series 618(2015), 012042
Cited 6 times in Scopus