Hello to all.
I want to simulate the scattering of proton beams (1 MeV to 5 MeV) from a thin gold target (20 nm). None of the physics lists (G4hMultipleScattering, G4EmStandardPhysics_option4, … ) answer? Why? Does anyone have any ideas or experience?
No backscattering is observed at angles higher than 90 degrees! I have made many changes to the physics lists. also I have used the step limiter but I have not got the result. Only the backscattering results of micrometer-thick targets are good!