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None Xenon gas detector, ionisation process, gamma particle gun 

Forum: Physics List
Date: 26 Apr, 2011
From: Baatr Bi <Baatr Bi>

Hello dear gurus! sorry for my bad English. objects to simulate: particle gun with gamma, gaseous detector with xenon (gas-xenon in bottle and and wire mesh (she is a registrar of gamma particle gun) around it)

big, BIIIG problem, in Physics List:
...
void PhysicsList::ConstructEM()
{
  theParticleIterator->reset();
  while( (*theParticleIterator)() ){
    G4ParticleDefinition* particle = theParticleIterator->value();
    G4ProcessManager* pmanager = particle->GetProcessManager();
    G4String particleName = particle->GetParticleName();

    if (particleName == "gamma") {
      // gamma         
      pmanager->AddDiscreteProcess(new G4PhotoElectricEffect);
      pmanager->AddDiscreteProcess(new G4ComptonScattering);
      pmanager->AddDiscreteProcess(new G4GammaConversion);
    } else if (particleName == "e-") {
      //electron
      G4eIonisation* eioni = new G4eIonisation();
      pmanager->AddProcess(new G4eMultipleScattering,-1, 1,1);
      pmanager->AddProcess(eioni,-1,2,2);
      pmanager->AddProcess(new G4eBremsstrahlung,-1,3,3);

    } else if (particleName == "e+") {
      //positron
      G4eIonisation* eioni = new G4eIonisation();
      pmanager->AddProcess(new G4eMultipleScattering,-1,1,1);
      pmanager->AddProcess(eioni,-1,2,2);
      pmanager->AddProcess(new G4eBremsstrahlung,-1,3,3);
      pmanager->AddProcess(new G4eplusAnnihilation,0,-1,4);
}... 

I need to get this histogram http://nuclphys.sinp.msu.ru/experiment/detectors/gammadet/images/gd01.gif

but experimentally i get just a peak in 662keV (it is for gamma particle gun with this energy for Cs137)

Please Help me! PLEASE!! how to solve this problem?? i trying 2 mouth to solve,but i get nothing similar.

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2011/04/26/09.10-81803-DetectorConstruction.cc
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2011/04/26/09.10-21601-PhysicsList.cc
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2011/04/26/09.10-80670-SensitiveDetector.cc
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2011/04/26/09.10-1293-PrimaryGeneratorAction.cc
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2011/04/26/09.10-46560-SteppingVerbose.cc

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1 None: Re: Xenon gas detector, ionisation process, gamma particle gun   (michel maire - 28 Apr, 2011)
2 Idea: Re: Xenon gas detector, ionisation process, gamma particle gun   (Vladimir Ivanchenko - 28 Apr, 2011)
3 None: Re: Xenon gas detector, ionisation process, gamma particle gun   (michel maire - 30 Apr, 2011)
1 Ok: Re: Xenon gas detector, ionisation process, gamma particle gun   (Baatr Bi - 03 May, 2011)
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