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Question Ionization of GeV Muon in gas with very low production cut 

Forum: Event and Track Management
Date: 11 Mar, 2018
From: Zhi Yu <Zhi Yu>

Dear Geant4 Experts:

I am trying to simulate primary ionization positions of GeV Muons in a gas layer (30% CO2 and 70% Ar, thickness of 1 cm)

The muon processes are defined as:

else if( particleName == "mu+" ||particleName == "mu-") {
//muon
pmanager->AddProcess(new G4MuMultipleScattering, -1, 1, 1);
pmanager->AddProcess(new G4MuIonisation, -1, 2, 2);
pmanager->AddProcess(new G4MuBremsstrahlung, -1, -1, 3);
pmanager->AddProcess(new G4MuPairProduction, -1, -1, 4);
}

As far as I learn, the ionization cross section depends on the cut value of electrons.
I think that if the production cut value is very low, say 1 nm, the step points of muon could be considered as the primary ionization positions.

But actually, most muons do not ionize in the gas region and only a few will generate 1 or 2 step points because of the muIoni process.

This simulation result contradicts the fact that gas detectors with such gas layers have a high detection efficiency for cosmic muons.
Is there anything wrong with my understanding of the production cut and ionization process ?

Best,
Zhi Yu

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1 Idea: Re: Ionization of GeV Muon in gas with very low production cut   (Vladimir Ivanchenko - 25 Mar, 2018)
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