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25 //
26 #include "globals.hh"
27 #include "G4GammaParticipants.hh"
28 #include "G4LorentzVector.hh"
29 #include "G4V3DNucleus.hh"
30 #include <utility>
31
32 // Class G4GammaParticipants
33
34 //#define debugGammaParticipants
35
36 G4VSplitableHadron* G4GammaParticipants::SelectInteractions(const G4ReactionProduct &thePrimary)
37 {
38 // Check reaction threshold - goes to CheckThreshold
39
40 theProjectileSplitable = new G4QGSMSplitableHadron(thePrimary, TRUE);
41 theProjectileSplitable->SetStatus(1);
42
43 G4LorentzVector aPrimaryMomentum(thePrimary.GetMomentum(), thePrimary.GetTotalEnergy());
44 G4LorentzVector aTargetNMomentum(0.,0.,0.,938.);
45 if((!(aPrimaryMomentum.e()>-1)) && (!(aPrimaryMomentum.e()<1)) )
46 {
47 throw G4HadronicException(__FILE__, __LINE__,
48 "G4GammaParticipants::SelectInteractions: primary nan energy.");
49 }
50 G4double S = (aPrimaryMomentum + aTargetNMomentum).mag2();
51 G4double ThresholdMass = thePrimary.GetMass() + 938.;
52 ModelMode = SOFT;
53
54 #ifdef debugGammaParticipants
55 G4cout <<G4endl<< "Gamma Participants - SelectInteractions " << G4endl;
56 G4cout << "Energy and Nucleus Mass N "<<thePrimary.GetTotalEnergy()<<" "<<theNucleus->GetMassNumber()<<G4endl;
57 G4cout << "SqrtS ThresholdMass ModelMode " <<std::sqrt(S)<<" "<<ThresholdMass<<" "<<ModelMode<< G4endl;
58 G4cout << "ThresholdParameter QGSMThreshold "<<ThresholdParameter<<" "<<QGSMThreshold<<G4endl;
59 #endif
60
61
62 if (sqr(ThresholdMass + ThresholdParameter) > S)
63 {
64 ModelMode = DIFFRACTIVE;
65 }
66
67 if (sqr(ThresholdMass + QGSMThreshold) > S)
68 {
69 ModelMode = DIFFRACTIVE;
70 }
71
72 #ifdef debugGammaParticipants
73 G4cout << "Interaction type (ModelMode) 0 - SOFT, 1 - DIFFRACTIVE: "<<ModelMode<< G4endl;
74 #endif
75
76 std::for_each(theInteractions.begin(), theInteractions.end(), DeleteInteractionContent());
77 theInteractions.clear();
78
79 // #ifdef debug_G4GammaParticipants
80 // G4double eK = thePrimary.GetKineticEnergy()/GeV;
81 // G4int nucleonCount = theNucleus->GetMassNumber();
82 // #endif
83
84 G4int theCurrent = G4int(theNucleus->GetMassNumber()*G4UniformRand());
85 G4int NucleonNo=0;
86
87 theNucleus->StartLoop();
88 G4Nucleon * pNucleon =0;
89
90 while( (pNucleon = theNucleus->GetNextNucleon()) ) {if(NucleonNo == theCurrent) break; NucleonNo++;}
91
92 if ( pNucleon ) {
93
94 G4QGSMSplitableHadron* aTarget = new G4QGSMSplitableHadron(*pNucleon);
95 pNucleon->Hit(aTarget);
96
97 if( (0.06 > G4UniformRand() &&(ModelMode==SOFT)) || (ModelMode==DIFFRACTIVE ) ) // (false) //
98 { // Diffractive interaction
99 G4InteractionContent * aInteraction = new G4InteractionContent(theProjectileSplitable);
100 theProjectileSplitable->SetStatus(1*theProjectileSplitable->GetStatus());
101
102 aInteraction->SetTarget(aTarget);
103 aInteraction->SetTargetNucleon(pNucleon);
104 aTarget->SetCollisionCount(0);
105 aTarget->SetStatus(1); // Mark that is Diffr. interaction
106
107 aInteraction->SetNumberOfDiffractiveCollisions(1);
108 aInteraction->SetNumberOfSoftCollisions(0);
109 aInteraction->SetStatus(1);
110
111 theInteractions.push_back(aInteraction);
112 }
113 else
114 {
115 // nondiffractive soft interaction occurs
116 aTarget->IncrementCollisionCount(1);
117 aTarget->SetStatus(0);
118 theTargets.push_back(aTarget);
119
120 theProjectileSplitable->IncrementCollisionCount(1);
121 theProjectileSplitable->SetStatus(0*theProjectileSplitable->GetStatus());
122
123 G4InteractionContent * aInteraction =
124 new G4InteractionContent(theProjectileSplitable);
125 aInteraction->SetTarget(aTarget);
126 aInteraction->SetTargetNucleon(pNucleon);
127 aInteraction->SetNumberOfSoftCollisions(1);
128 aInteraction->SetStatus(0); // Mark that is non-Diffr. interaction
129 theInteractions.push_back(aInteraction);
130 }
131 }
132 return theProjectileSplitable;
133 }
134