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