Berlin 2005 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 22: Postersitzung

HK 22.75: Poster

Montag, 7. März 2005, 16:30–18:00, TU MA141

A photoneutron source for time-of-flight experiments at the radiation source ELBE — •A.R. Junghans¹, E. Altstadt¹, R. Beyer¹, H. Freiesleben², V. Galindo¹, M. Greschner², E. Grosse^1,2, K. Noack¹, A. Rogov¹, A. Wagner¹, and F.P. Weiss¹ — ¹Forschungszentrum Rossendorf, Dresden, Germany — ²Technische Universität Dresden, Dresden, Germany

The radiation source ELBE at Research Center Rossendorf can deliver electron beam energies between 12 MeV and 40 MeV with a wide variability of the beam intensity and pulse structure (1 mA at 13 MHz repetition rate [and at 1 MHz after completion of the photo-gun injector under developement at FZR], pulse width <10 ps). This electron beam is ideally suited to produce intense sub-ns neutron pulses from (γ,n)-reactions with bremsstrahlung photons in a small-volume liquid-Pb radiator circuit. Because of the excellent time structure of the electron beam, a comparably short flight path (<4 m) can be used to make high-resolution time-of-flight measurements with fast neutrons. An energy resolution of Δ E/E ≈1% can be reached up to E_kin ≈3 MeV with a differential neutron flux of ≈10⁶(cm² s MeV)⁻¹. The physics objectives are to measure reactions induced by fast neutrons important for construction materials of advanced reactor systems and transmutation of nuclear waste. For studies of (n,γ) reactions of relevance to the cosmic nucleosynthesis a differential neutron flux of ≈10⁴(cm² s 10 keV)⁻¹ in the energy range of ≈100 keV is expected.