Abstract
The inelastic scattering of fast neutrons from 7Li nuclei was investigated at the nELBE neutron-time-of-flight facility. The photon production cross section of 478 keV γ-rays from the first excited state of 7Li was determined by irradiating a disc of LiF with neutrons of energies ranging from 100 keV to about 10 MeV. The target position was surounded by a setup of 7 LaBr3 scintillation detectors and 7 high-purity germanium detectors to detect the de-excitation γ-rays. A 235U fission chamber was used to determine the incoming neutron flux. The number of detected photons was corrected for the detection efficiency, multiple scattering and the time-of-flight dependent data acquisition dead time. The preliminary results show reasonable agreement with some previous measurments but are about 15 % below the recent data taken at the GELINA facility.
Highlights
Inelastic neutron scattering on 7Li has technological implications in fusion and fission reactors
Inelastic neutron scattering on 7Li leads to the production of a 478 keV γ-ray from the first excited state of 7Li
At the neutron ToF facility nELBE the inelastic scattering on 7Li was investigated
Summary
Inelastic neutron scattering on 7Li has technological implications in fusion and fission reactors. In the former it could create an intense γ-ray field causing heating and radiation damage, in the latter it could strongly influence the neutron energy spectrum and the neutronics of e.g. novel reactor concepts like the molten salt reactor. The γ-ray production cross section of 7Li could be used as an alternative for neutron fluence determination to enable relative measurements of neutron-induced reactions [1]. It is reasonably high to enable good statistics within a feasible measurement time. With these properties 7Li seems to be a good candidate to replace for instance neutron induced fission of 235U as reference cross section especially in short or low neutron flux experiments
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