Gabriele Cosmo
123 lines
4.8 KiB
C++
123 lines
4.8 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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#include "globals.hh"
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#include "G4GammaParticipants.hh"
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#include "G4LorentzVector.hh"
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#include "G4V3DNucleus.hh"
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#include <utility>
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// Class G4GammaParticipants
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G4VSplitableHadron* G4GammaParticipants::SelectInteractions(const G4ReactionProduct &thePrimary)
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{
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// Check reaction threshold - goes to CheckThreshold
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theProjectileSplitable = new G4QGSMSplitableHadron(thePrimary, TRUE);
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theProjectileSplitable->SetStatus(1);
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G4LorentzVector aPrimaryMomentum(thePrimary.GetMomentum(), thePrimary.GetTotalEnergy());
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G4LorentzVector aTargetNMomentum(0.,0.,0.,938.);
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if((!(aPrimaryMomentum.e()>-1)) && (!(aPrimaryMomentum.e()<1)) )
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{
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throw G4HadronicException(__FILE__, __LINE__,
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"G4GammaParticipants::SelectInteractions: primary nan energy.");
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}
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G4double S = (aPrimaryMomentum + aTargetNMomentum).mag2();
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G4double ThresholdMass = thePrimary.GetMass() + 938.;
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ModelMode = SOFT;
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if (sqr(ThresholdMass + ThresholdParameter) > S)
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{
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ModelMode = DIFFRACTIVE;
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}
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if (sqr(ThresholdMass + QGSMThreshold) > S)
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{
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ModelMode = DIFFRACTIVE;
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}
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std::for_each(theInteractions.begin(), theInteractions.end(), DeleteInteractionContent());
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theInteractions.clear();
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G4int totalCuts = 0;
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#ifdef debug_G4GammaParticipants
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G4double eK = thePrimary.GetKineticEnergy()/GeV;
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G4int nucleonCount = theNucleus->GetMassNumber();
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#endif
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G4int theCurrent = G4int(theNucleus->GetMassNumber()*G4UniformRand());
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G4int NucleonNo=0;
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theNucleus->StartLoop();
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G4Nucleon * pNucleon =0;
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while( (pNucleon = theNucleus->GetNextNucleon()) ) {if(NucleonNo == theCurrent) break; NucleonNo++;}
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if ( pNucleon ) {
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G4QGSMSplitableHadron* aTarget = new G4QGSMSplitableHadron(*pNucleon);
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pNucleon->Hit(aTarget);
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if ( (0.06 > G4UniformRand() &&(ModelMode==SOFT)) || (ModelMode==DIFFRACTIVE ) )
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{ // Diffractive interaction
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G4InteractionContent * aInteraction = new G4InteractionContent(theProjectileSplitable);
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theProjectileSplitable->SetStatus(1*theProjectileSplitable->GetStatus());
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aInteraction->SetTarget(aTarget);
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aInteraction->SetTargetNucleon(pNucleon);
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aTarget->SetCollisionCount(0);
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aTarget->SetStatus(1); // Mark that is Diffr. interaction
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aInteraction->SetNumberOfDiffractiveCollisions(1);
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aInteraction->SetNumberOfSoftCollisions(0);
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aInteraction->SetStatus(1);
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theInteractions.push_back(aInteraction);
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totalCuts += 1;
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}
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else
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{
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// nondiffractive soft interaction occurs
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aTarget->IncrementCollisionCount(1);
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aTarget->SetStatus(0);
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theTargets.push_back(aTarget);
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theProjectileSplitable->IncrementCollisionCount(1);
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theProjectileSplitable->SetStatus(0*theProjectileSplitable->GetStatus());
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G4InteractionContent * aInteraction =
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new G4InteractionContent(theProjectileSplitable);
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aInteraction->SetTarget(aTarget);
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aInteraction->SetTargetNucleon(pNucleon);
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aInteraction->SetNumberOfSoftCollisions(1);
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aInteraction->SetStatus(0); // Mark that is non-Diffr. interaction
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theInteractions.push_back(aInteraction);
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totalCuts += 1;
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}
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}
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return theProjectileSplitable;
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}
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