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Hello, All published tables usually include CSDA range - range along the trajectory, so scattering is not taken into account. In real tracking scattering is important - particle track is straght line only at high energy. VI ________________________________________ From: Kristjan Poder [firstname.lastname@example.org] Sent: 12 March 2012 11:49 To: email@example.com Subject: G4MuMultipleScattering issues *** Discussion title: Physics List Hi! I'm simulating muon creation via pair production in high Z materials and the properties of the generated muons. However, I have noticed that the behaviour of muons in my simulation is very strange. They seem to lose energy a lot faster than predicted by theoretical models. For muons I have registered the following processes: pmanager->AddProcess(new G4MuMultipleScattering, -1, 1, 1); pmanager->AddProcess(new G4MuIonisation, -1, 2, 2); pmanager->AddProcess(new G4MuBremsstrahlung, -1, 3, 3); pmanager->AddProcess(new G4MuPairProduction, -1, 4, 4); After some work I have singled the problem to lay with the first of these processes, the G4MuMultipleScattering. Not registering this process gives a lot better agreement with theory. I have attached an image depicting the range of a mu- in lead and tungsten as a function of its initial energy, showing the issue I'm having. The question here I have is obvious: is there something wrong with the process itself or am I registering it wrong? The DefaultCuts value is 1 mm. Thank you, Kristjan Attachment: http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2012/03/12/03.46-1470-real_vs_theoretical.png ------------------------------------------------------------- Visit this GEANT4 at hypernews.slac.stanford.edu message (to reply or unsubscribe) at: http://hypernews.slac.stanford.edu/HyperNews/geant4/get/phys-list/695.html