I have the following problem: I am shooting 20 MeV neutrons and looking at the cross sections for elastic and inelastic scattering. I am including, two graphs: FLUKA and GEANT4. G4 is when the elastic scattering has 3 peaks. The binning here is logarithmic. When comparing this to FLUKA measurements, it seems that the elastic scattering should not have 3 peaks, but just 1 and little bit. I have obtained the same results with QGSP_BIC_HP, QGSP_BERT_HP, QGSP_INCLXX_HP, QGSP_BIC_HP. When shooting the protons at 20 MeV, the elastic scattering has very similar features. Does anyone have an idea, why are there differences and which of the approaches is the right one?