| 1 | //
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| 2 | // ********************************************************************
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| 3 | // * License and Disclaimer *
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| 4 | // * *
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of *
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and *
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| 7 | // * conditions of the Geant4 Software License, included in the file *
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These *
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| 9 | // * include a list of copyright holders. *
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| 10 | // * *
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| 11 | // * Neither the authors of this software system, nor their employing *
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| 12 | // * institutes,nor the agencies providing financial support for this *
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| 13 | // * work make any representation or warranty, express or implied, *
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| 14 | // * regarding this software system or assume any liability for its *
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| 15 | // * use. Please see the license in the file LICENSE and URL above *
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| 16 | // * for the full disclaimer and the limitation of liability. *
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| 17 | // * *
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| 18 | // * This code implementation is the result of the scientific and *
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| 19 | // * technical work of the GEANT4 collaboration. *
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| 20 | // * By using, copying, modifying or distributing the software (or *
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| 21 | // * any work based on the software) you agree to acknowledge its *
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| 22 | // * use in resulting scientific publications, and indicate your *
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| 23 | // * acceptance of all terms of the Geant4 Software license. *
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| 24 | // ********************************************************************
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| 25 | //
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| 26 | #include "globals.hh"
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| 27 | #include "G4GammaParticipants.hh"
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| 28 | #include "G4LorentzVector.hh"
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| 29 | #include <utility>
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| 30 |
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| 31 | // Class G4GammaParticipants
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| 32 |
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| 33 | // J.P. Wellisch, April 2002
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| 34 | // new participants class for gamma nuclear, with this design more can come with
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| 35 | // cross-section based, and quasi-eiconal model based modelling
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| 36 |
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| 37 | G4VSplitableHadron* G4GammaParticipants::SelectInteractions(const G4ReactionProduct &thePrimary)
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| 38 | {
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| 39 | // Check reaction threshold - goes to CheckThreshold
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| 40 | G4VSplitableHadron* aProjectile = new G4QGSMSplitableHadron(thePrimary, TRUE); // @@@ check the TRUE
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| 41 |
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| 42 | const std::vector<G4Nucleon *> & theTargetNuc = theNucleus->GetNucleons();
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| 43 | G4LorentzVector aPrimaryMomentum(thePrimary.GetMomentum(), thePrimary.GetTotalEnergy());
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| 44 | if((!(aPrimaryMomentum.e()>-1)) && (!(aPrimaryMomentum.e()<1)) )
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| 45 | {
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| 46 | throw G4HadronicException(__FILE__, __LINE__,
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| 47 | "G4GammaParticipants::SelectInteractions: primary nan energy.");
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| 48 | }
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| 49 | G4double s = (aPrimaryMomentum + theTargetNuc[0]->Get4Momentum()).mag2();
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| 50 | G4double ThresholdMass = thePrimary.GetMass() + theTargetNuc[0]->GetDefinition()->GetPDGMass();
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| 51 | ModelMode = SOFT;
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| 52 | if (sqr(ThresholdMass + ThresholdParameter) > s)
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| 53 | {
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| 54 | ModelMode = DIFFRACTIVE;
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| 55 | //throw G4HadronicException(__FILE__, __LINE__, "Initial energy is too low. The 4-vectors of the input are inconsistant with the particle masses.");
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| 56 | }
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| 57 | if (sqr(ThresholdMass + QGSMThreshold) > s) // thus only diffractive in cascade!
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| 58 | {
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| 59 | ModelMode = DIFFRACTIVE;
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| 60 | }
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| 61 |
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| 62 | // first find the collisions HPW
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| 63 | std::for_each(theInteractions.begin(), theInteractions.end(), DeleteInteractionContent());
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| 64 | theInteractions.clear();
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| 65 | G4int totalCuts = 0;
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| 66 |
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| 67 | #ifdef debug_G4GammaParticipants
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| 68 | G4double eK = thePrimary.GetKineticEnergy()/GeV;
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| 69 | G4int nucleonCount = theTargetNuc.size(); // debug
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| 70 | #endif
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| 71 |
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| 72 | G4int theCurrent = static_cast<G4int> (theTargetNuc.size()*G4UniformRand());
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| 73 | G4Nucleon * pNucleon = theTargetNuc[theCurrent];
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| 74 | G4QGSMSplitableHadron* aTarget = new G4QGSMSplitableHadron(*pNucleon);
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| 75 | theTargets.push_back(aTarget);
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| 76 | pNucleon->Hit(aTarget);
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| 77 | if ( (0.06 > G4UniformRand() &&(ModelMode==SOFT)) || (ModelMode==DIFFRACTIVE ) )
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| 78 | {
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| 79 | // diffractive interaction occurs
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| 80 | if(IsSingleDiffractive())
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| 81 | {
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| 82 | theSingleDiffExcitation.ExciteParticipants(aProjectile, aTarget);
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| 83 | }
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| 84 | else
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| 85 | {
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| 86 | theDiffExcitaton.ExciteParticipants(aProjectile, aTarget);
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| 87 | }
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| 88 | G4InteractionContent * aInteraction = new G4InteractionContent(aProjectile);
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| 89 | aInteraction->SetTarget(aTarget);
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| 90 | theInteractions.push_back(aInteraction);
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| 91 | aInteraction->SetNumberOfDiffractiveCollisions(1);
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| 92 | totalCuts += 1;
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| 93 | }
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| 94 | else
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| 95 | {
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| 96 | // nondiffractive soft interaction occurs
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| 97 | aTarget->IncrementCollisionCount(1);
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| 98 | aProjectile->IncrementCollisionCount(1);
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| 99 | G4InteractionContent * aInteraction = new G4InteractionContent(aProjectile);
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| 100 | aInteraction->SetTarget(aTarget);
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| 101 | aInteraction->SetNumberOfSoftCollisions(1);
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| 102 | theInteractions.push_back(aInteraction);
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| 103 | totalCuts += 1;
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| 104 | }
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| 105 | return aProjectile;
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| 106 | }
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