The Stuttgart positron beam, its performance and recent experiments

W. Bauer, J. Briggmann, H. D. Carstanjen, S. Connell, W. Decker, J. Diehl, K. Maier, J. Major, H. E. Schaefer, A. Seeger, H. Stoll, E. Widmann

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25 Citations (Scopus)


A monoenergetic MeV positron (e+) beam, with a flux at present of 6 × 104 e+/s in the energy range of 0.5 to 6.5 MeV, has been installed at the Stuttgart Pelletron accelerator. The stabilization and the absolute calibration of the energy E is monitored by a Ge detector with real-time feedback; a relative energy stability of Δ E E ≤ 10-4 is obtained. So far, e+e- scattering and annihilation-in-flight experiments for investigating the low-energy e+e- interaction as well as β+ γ positron lifetime measurements in condensed matter have been performed. The advantages of the β+ γ method compared to the conventional γγ coincidence technique have been demonstrated. Recently, triple-coincidence positron "age-momentum correlation" measurements have been carried out on fused quartz. A brief account is given on the development of a "positron clock" aiming at a substantial improvement of the time resolution of the β+ γ positron lifetime measurements.

Original languageEnglish
Pages (from-to)300-306
Number of pages7
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Issue number1-4
Publication statusPublished - 3 Apr 1990
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation


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