Abstract
The inelastic scattering of fast neutrons on 56 Fe was investigated in different manners at the neutron time-of-flight facility n ELBE. The scattering cross section was determined via the measurement of the γ-ray production and by means of a kinematically complete double time-of-flight method. In a further measurement the γ-ray angular distribution was determined to correct the measured cross sections for anisotropy. The resulting inelastic scattering cross section determined from the photo production cross sections is in very good agreement with evaluations and previous measurements. In contrast, the result of the double time-of-flight measurement is about 10% lower than these data, giving a hint to neutron-γ-ray angular correlations in the process of inelastic neutron scattering.
Highlights
The CIELO project (Collaborative International Evaluated Library Organization) [1] selected six highest-priority pilot isotopes to initially be investigated
Besides 1H, 16O, 235U, 238U and 239Pu there is 56Fe which is one of the major construction material of nuclear facilities. This importance was already mentioned in the context of the development of Generation IV nuclear reactors and transmutation technologies [2, 3] as well as by the OECD NEA high priority request list [4]
The inelastic scattering cross section is calculated from the number of events Ndet when one plastic scintillation detector registered a neutron in coincidence with a γ -ray detected in one of the BaF2 scintillators
Summary
The CIELO project (Collaborative International Evaluated Library Organization) [1] selected six highest-priority pilot isotopes to initially be investigated. Besides 1H, 16O, 235U, 238U and 239Pu there is 56Fe which is one of the major construction material of nuclear facilities This importance was already mentioned in the context of the development of Generation IV nuclear reactors and transmutation technologies [2, 3] as well as by the OECD NEA high priority request list [4]. A kinematically complete measurement, i.e. a coincident measurement of the scattered neutron and the deexcitation γ -ray, can be performed with a continuous energy spectrum and is independent of the knowledge about the level and de-excitation schema of the target nucleus Such type of experiment could add further information to the evaluation process and reduce the overall uncertainty of the combined data from all different methods
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