In the process of nuclear fission, due to the momentum enhancement of the fission fragments, the neutrons will exhibit angular correlation. For a certain class of problem the emergent n-n angular correlation trends with multiplication. Using the scintillation array can simultaneously obtain time and angle information of fission neutrons. Therefore, this paper make an exploratory study of the potential of using neutron-neutron angular correlation as a complementary observable in the fast neutron multiplicity counting. This paper explores the intrinsic relationship between neutron anisotropy and multiplication coefficient, and neutron anisotropy can be used as a reference to reflect multiplication coefficient On this basis, the fission neutron anisotropy was quantified with the ratio of neutron–neutron coincidences observed at 180° and 90°. Fitting the neutron leakage multiplication coefficient and anisotropy. After measuring the anisotropy of the sample, the leakage multiplication coefficient can be obtained through this fitting relationship, and then combine it with fast neutron multiplicity to solve the mass of nuclear material,. The results were verified through simulation calculations by Geant4. The deviation of the results obtained by using this method is significantly lower than that obtained by using the fast neutron multiplicity method. This method can be used for estimate the quality properties of nuclear materials, but is not intended for the assay of completely unknown items. Instead, we reframe its potential application for situations where a item's general class is known.
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