MeV Neutron Production from Thermal Neutron Capture in 6Li Simulated With Geant4

6th European Conference on Neutron Scattering

Santoro, Valentina^1 ; Dijulio, Douglas D.^1,2 ; Bentley, Phillip M.^1,3

European Spallation Source ERIC, Lund

SE-221 00, Sweden^1

Department of Physics, Lund University, Lund

SE-221 00, Sweden^2

Department of Physics and Astronomy, Uppsala University, Uppsala

751 05, Sweden^3

关键词: Fast neutron generation;    Neutron absorbers;    Neutron attenuation;    Neutron instruments;    Neutron production;    Simulation toolkits;    Spallation neutron sources;    Thermal neutron capture;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/746/1/012012/pdf
DOI  :  10.1088/1742-6596/746/1/012012

来源: IOP

【 摘 要 】

Various Li compounds are commonly used at neutron facilities as neutron absorbers. These compounds provide one of the highest ratios of neutron attenuation to y- ray production. Unfortunately, the usage of these compounds can also give rise to fast neutron emission with energies up to almost 16 MeV. Historically, some details in this fast neutron production mechanism can be absent from some modeling packages under some optimization scenarios. In this work, we tested Geant4 to assess the performance of this simulation toolkit for the fast neutron generation mechanism. We compare the results of simulations performed with Geant4 to available measurements. The outcome of our study shows that results of the Geant4 simulations are in good agreement with the available measurements for6Li fast neutron production, and suitable for neutron instrument background evaluation at spallation neutron sources.