TOTAL DELAYED NEUTRON YIELD FROM ~(232)Th FISSION BY 3.2-4.9 MeV NEUTRONS

摘要

The results of measurements of the total yield of delayed neutrons from Th fission by 3.2-4.9 MeV neutrons in a setup in the ion guide of the KG-2.5 electrostatic accelerator at the Physics and Power Engineering Institute are presented. Two types of measurements are performed in the experiments. In the first type, the relative yield of delayed neutrons is measured. In the second type, the energy dependence of the total yield of delayed neutrons is studied. The measurements are compared with data obtained by other authors. Three types of data are used for the comparison: experimental, computed, and evaluated data from the ENDF/BVII, JENDL3.3, and JEFFS.1 data libraries. The following are obtained: the energy dependence of the total yield of delayed neutrons in the range 3.2-4.9 MeV and the average over the indicated energy range total yield of delayed neutrons per fission 0.0562 ± 0.0015, which can be recommended for use in reactor calculations.