|Message: Re: Problem with PIXE experimental and simulation scale||Not Logged In (login)|
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Geant4 has several parameterisations for PIXE cross sections. These cross sections are based on data below 10 MeV, a simple approximation is used above. It is not accurate for your energies but cannot be many orders of magnitude off. Likely in your case this cross section is zero for some reason. Try to study log file of simulation, may be reproduce your problem in $G4INSTALL/examples/extended/electromagnetic/TestEm5