Abstract
At the superconducting electron linear accelerator ELBE at Forschungszentrum Dresden-Rossendorf the neutron time-of-flight facility nELBE has become operational. Fast neutrons in the energy range from 200 keV to 10 MeV are produced by the pulsed electron beam from ELBE impinging on a liquid lead circuit as a radiator. The short beam pulses of 10 ps provide the basis for an excellent time resolution for neutron time-of-flight experiments, giving an energy resolution of about <1% at 1 MeV with a short flight path of 5 m. By means of a “double-time-of-flight” setup the (n,nâγ) cross section to the first excited state of 56Fe has been measured over the whole energy range without knowledge about cross sections of higher-lying levels. Plastic scintillators were used to detect the inelastically scattered neutron and BaF2 detectors to detect the correlated γ-ray.
Highlights
Partitioning of nuclear waste and transmutation of long-lived isotopes to nuclides with shorter lifetime is an important topic in international research to provide sustainable and green-house gas emission free sources of energy
The short beam pulses of 10 ps provide the basis for an excellent time resolution for neutron timeof-flight experiments, giving an energy resolution of about
Two important research fields were identified to be the inelastic scattering of fast neutrons on structure materials in reactors and transmutation devices and the neutron induced fission process of minor actinide nuclei
Summary
Partitioning of nuclear waste and transmutation of long-lived isotopes to nuclides with shorter lifetime is an important topic in international research to provide sustainable and green-house gas emission free sources of energy. In the considerations for waste reduction the possible use of fast (i.e. un-moderated) neutrons as coming directly from the fission process is of great importance as most of the proposed systems use a fast neutron spectrum. Two important research fields were identified to be the inelastic scattering of fast neutrons on structure materials in reactors and transmutation devices and the neutron induced fission process of minor actinide nuclei. At Forschungszentrum Dresden-Rossendorf the first compact photoneutron source at a superconducting electron accelerator dedicated to measurements in the fast neutron range has been built. There is a project at KAERI, Republic of Korea, to install a compact photoneutron source at their electron accelerator [1]
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