Abstract
237 Np absolute delayed neutron yields have been measured at different incident neutron energies from 1.5 to 16 MeV. The experiment was performed at the Physikalisch-Technische Bundesanstalt (PTB) facility where the Van de Graaff accelerator and the cyclotron CV28 delivered 9 different neutron energy beams using p+T, d+D and d+T reactions. The detection system is made up of twelve 3 He tubes inserted into a polyethylene cylinder. In this paper, the experimental setup and the data analysis method are described. The evolution of the absolute DN yields as a function of the neutron incident beam energies are presented and compared to experimental data found in the literature and data from the libraries.
Highlights
Delayed neutrons and gamma-rays are emitted after the beta- decay of neutron-rich nuclei
Recent development of non-destructive methods for the detection of nuclear materials use the emission of neutrons (DN) to detect actinides by irradiating nuclear waste barrels or containers with photon or neutron beams
For accelerator driven systems (ADS) with minor actinide contents, the delayed neutrons (DN) balance is different from usual reactors
Summary
Delayed neutrons and gamma-rays are emitted after the beta- decay of neutron-rich nuclei (called precursors). These nuclei are produced, for example, by the fission of actinides. It is necessary to know the energy dependence of minor actinide DN yields. Results found in the literature for 237Np DN yields only cover a small domain in incident neutron energy. Since 237Np is one the easiest nuclei to study in the minor actinide region, it was a motivation to perform measurements of DN yields with a high precision over a large energy domain. An experiment was carried out at the ion accelerator facility PIAF of the Physikalisch-Technische Bundesanstalt (PTB) for nine neutron incident energies between 1.5 MeV and 16 MeV.
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