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Forum: Physics List
Re: None G4MuMultipleScattering issues (Kristjan Poder)
Date: 17 Mar, 2012
From: Vladimir Ivanchenko <Vladimir Ivanchenko>

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 [kp8172@bristol.ac.uk]
Sent: 12 March 2012 11:49
To: phys-list-g4hn@slac.stanford.edu
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

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