No observation of large angle scattering of protons!

Hello every one.
I want to investigate the scattering of a proton beam in the range of 1 to 5 MeV when passing through a thin gold foil (15 nm). I,m using geant4 9.6 version. The diameter of the beam is 1 mm and the energy distribution of protons is uniform. In this energy range, there is no effect of large-angle scattering. Why? can anyone help me?
I have tested the different physics lists (G4hMultipleScattering, G4EmStandardPhysics_option4, G4EmLivermorePhysics ,… based on B01, Microbeam, EXN02 examples) but there is not much difference. At much lower energies there is scattering. Look at the attachment.

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