出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：The ELBE electron beam at Forschungszentrum Rossendorf, Dresden, with energies up to 40
MeV, will be used to produce intense neutron beams. The neutron radiator consists of a liquid
lead circuit where bremsstrahlung photons created by the electrons produce neutrons in (γ,n)
reactions. The short beam pulses (5 ps) provide the basis for an excellent time resolution for
neutron time-of-flight experiments, giving an energy resolution of about 1 % with a flight path
of 4 m. The neutron beam is shaped by a 2.4 m long collimator. The usable energy range is
from 50 keV up to 10 MeV when ELBE delivers a beam repetition rate of 0.5 MHz. In this
energy interval, there is a need for neutron cross section measurements relevant for the
transmutation of minor actinides in nuclear waste, as well as for applications to fission and
fusion reactors. The neutron flux at the sample position is 107 cm-2 s-1.
Different detector types are being developed. For neutron capture γ rays, a BaF2 scintillation
detector array of 42 crystals is being constructed, whereas for neutron detection, an up to 1 m2
large plastic scintillator wall consisting of 1 cm thick scintillation panels is being built.
