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I'm simulating an electron beam (70 MeV) impinging on a thin target consisting of a low Z material (10mg/cm2 and Z=10). I am interested in the energy spectrum at backward angles (150 - 180 degrees) concerning the elastically scattered electrons and bremsstrahlung. Because of the thin target I have only a few events in my detector (~10 at an event rate of 10^8). So some kind of cross section biasing seems to be necessary.
Most of the electrons are scattered in forward direction (>95% are scattered in an angular range of 0-5 degrees). So in case of electron scattering "angular biasing" is maybe a good idea, i.e. increasing the cross section for elastic electron scattering at backward angles relative to the cross section for forward angles by several orders of magnitude. What is the best way to achieve this? Has anyone tried something similar?
Thanks in advance for your help!