G4GammaParticipants.cc

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#include "globals.hh"
#include "G4GammaParticipants.hh"
#include "G4LorentzVector.hh"
#include "G4V3DNucleus.hh"
#include <utility>
 
// Class G4GammaParticipants 
 
//#define debugGammaParticipants
 
G4VSplitableHadron* G4GammaParticipants::SelectInteractions(const G4ReactionProduct  &thePrimary) 
{
    // Check reaction threshold  - goes to CheckThreshold
 
    theProjectileSplitable = new G4QGSMSplitableHadron(thePrimary, TRUE);
        theProjectileSplitable->SetStatus(1);
 
    G4LorentzVector aPrimaryMomentum(thePrimary.GetMomentum(), thePrimary.GetTotalEnergy());
    G4LorentzVector aTargetNMomentum(0.,0.,0.,938.);
    if((!(aPrimaryMomentum.e()>-1)) && (!(aPrimaryMomentum.e()<1)) )
    {
        throw G4HadronicException(__FILE__, __LINE__,
                "G4GammaParticipants::SelectInteractions: primary nan energy.");
    }
    G4double S = (aPrimaryMomentum + aTargetNMomentum).mag2();
    G4double ThresholdMass = thePrimary.GetMass() + 938.;
    ModelMode = SOFT;
 
    #ifdef debugGammaParticipants
        G4cout <<G4endl<< "Gamma Participants - SelectInteractions " << G4endl;
                G4cout << "Energy and Nucleus Mass N "<<thePrimary.GetTotalEnergy()<<" "<<theNucleus->GetMassNumber()<<G4endl;
        G4cout << "SqrtS ThresholdMass ModelMode " <<std::sqrt(S)<<" "<<ThresholdMass<<" "<<ModelMode<< G4endl;
                G4cout << "ThresholdParameter QGSMThreshold "<<ThresholdParameter<<" "<<QGSMThreshold<<G4endl;
    #endif
 
 
    if (sqr(ThresholdMass + ThresholdParameter) > S)
    {
        ModelMode = DIFFRACTIVE;
    }
 
    if (sqr(ThresholdMass + QGSMThreshold) > S)
    {
        ModelMode = DIFFRACTIVE;
    }
 
    #ifdef debugGammaParticipants
        G4cout << "Interaction type (ModelMode) 0 - SOFT, 1 - DIFFRACTIVE:    "<<ModelMode<< G4endl;
    #endif
 
    std::for_each(theInteractions.begin(), theInteractions.end(), DeleteInteractionContent());
    theInteractions.clear();
 
//  #ifdef debug_G4GammaParticipants
//      G4double eK = thePrimary.GetKineticEnergy()/GeV;
//      G4int nucleonCount = theNucleus->GetMassNumber();
//  #endif
 
    G4int theCurrent = G4int(theNucleus->GetMassNumber()*G4UniformRand());
        G4int NucleonNo=0;
 
        theNucleus->StartLoop();
        G4Nucleon * pNucleon =0;
 
        while( (pNucleon = theNucleus->GetNextNucleon()) ) {if(NucleonNo == theCurrent) break; NucleonNo++;} 
 
        if ( pNucleon ) {
 
      G4QGSMSplitableHadron* aTarget = new G4QGSMSplitableHadron(*pNucleon);
          pNucleon->Hit(aTarget);
 
      if( (0.06 > G4UniformRand() &&(ModelMode==SOFT)) || (ModelMode==DIFFRACTIVE ) ) //  (false) //
      {     // Diffractive interaction
            G4InteractionContent * aInteraction = new G4InteractionContent(theProjectileSplitable);
            theProjectileSplitable->SetStatus(1*theProjectileSplitable->GetStatus());
 
            aInteraction->SetTarget(aTarget);
            aInteraction->SetTargetNucleon(pNucleon);
            aTarget->SetCollisionCount(0);
            aTarget->SetStatus(1);                             // Mark that is Diffr. interaction
 
            aInteraction->SetNumberOfDiffractiveCollisions(1);
            aInteraction->SetNumberOfSoftCollisions(0);
            aInteraction->SetStatus(1);
 
            theInteractions.push_back(aInteraction);
      }
      else
      {
        // nondiffractive soft interaction occurs
        aTarget->IncrementCollisionCount(1);
            aTarget->SetStatus(0);
            theTargets.push_back(aTarget);
 
        theProjectileSplitable->IncrementCollisionCount(1);
            theProjectileSplitable->SetStatus(0*theProjectileSplitable->GetStatus());
 
        G4InteractionContent * aInteraction = 
                                           new G4InteractionContent(theProjectileSplitable);
        aInteraction->SetTarget(aTarget);
            aInteraction->SetTargetNucleon(pNucleon);
        aInteraction->SetNumberOfSoftCollisions(1);
            aInteraction->SetStatus(0);                        // Mark that is non-Diffr. interaction
        theInteractions.push_back(aInteraction);
      }
        }
    return theProjectileSplitable;
}