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Forum: Physics List
Date: 12 Mar, 2012
From: Kristjan Poder <Kristjan Poder>

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

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1 None: RE: G4MuMultipleScattering issues   (Vladimir Ivantchenko - 17 Mar, 2012)
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