I am using GEANT4 simulation for finding neutron fluxes from various targets when electron beam strikes them. I see a pattern that the value of neutron flux that I am getting through GEANT4 is less than the literature suggests (various work done and published in renowned journals).
I am told MC simulations tend to underestimate the absolute values of particle fluxes sometimes by a power of 10. I am not very convinced. Does anyone else face this issue?
I am using QGSP_BIC_HP physics list and for material definition I am using NIST data.
Any help would be much appreciated.