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Forum: Hadronic Processes
Date: 17 Apr, 2009
From: <csi505>

Hi:
   I have made a simulation on the reaction B10(n,alpha)Li7 with Geant4.9.2. The energy of neutron is 0.0253ev.
  But in my simulation I got a angular distribution of alpha which is not 
isotropic.
   My physicsList is LHEP_PRECO_HP.
   My SteppingAction as follows:

    const G4Track* track = step->GetTrack();
    G4String name = track->GetDefinition()->GetParticleName();
   if(name == "alpha"){
    G4ThreeVector dir = track->GetVertexMomentumDirection(); 
    G4ThreeVector pos = track->GetVertexPosition();
    G4cout<<pos.z()<<G4endl; 
    G4cout<<dir.z()<<G4endl;
    G4double dir_z = dir.z();
    G4double cosPhi = dir_z; 
    G4int Phi=int(acos(cosPhi)/deg); 
    NumID2[Phi]+=1;
  }

  Will you give me some help?
   I think my physicsList is right,but the SteppingAction may be wrong.So what's the ringt SteppingAction?

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1 Note: Re: a wrong angular distribution of alpha ?   (Marcus Mendenhall - 18 Apr, 2009)
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