| Geant4 Cross Reference |
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26 // 23 //
>> 24 // $Id: G4VElasticCollision.cc,v 1.2 2004/12/07 13:48:52 gunter Exp $ //
27 25
28 #include "globals.hh" 26 #include "globals.hh"
29 #include "G4VElasticCollision.hh" 27 #include "G4VElasticCollision.hh"
30 #include "G4KineticTrack.hh" 28 #include "G4KineticTrack.hh"
31 #include "G4VCrossSectionSource.hh" 29 #include "G4VCrossSectionSource.hh"
32 #include "G4Proton.hh" 30 #include "G4Proton.hh"
33 #include "G4Neutron.hh" 31 #include "G4Neutron.hh"
34 #include "G4XNNElastic.hh" 32 #include "G4XNNElastic.hh"
35 #include "G4AngularDistribution.hh" 33 #include "G4AngularDistribution.hh"
36 #include "G4ThreeVector.hh" 34 #include "G4ThreeVector.hh"
37 #include "G4LorentzVector.hh" 35 #include "G4LorentzVector.hh"
38 #include "G4LorentzRotation.hh" 36 #include "G4LorentzRotation.hh"
39 #include "G4KineticTrackVector.hh" 37 #include "G4KineticTrackVector.hh"
40 #include "G4AngularDistributionNP.hh" // np 38 #include "G4AngularDistributionNP.hh" // np scattering
41 #include "G4AngularDistributionPP.hh" // nn 39 #include "G4AngularDistributionPP.hh" // nn and pp scattering
42 #include <typeinfo> 40 #include <typeinfo>
43 41
44 G4VElasticCollision::G4VElasticCollision() 42 G4VElasticCollision::G4VElasticCollision()
45 { 43 {
46 } 44 }
47 45
48 46
49 G4VElasticCollision::~G4VElasticCollision() 47 G4VElasticCollision::~G4VElasticCollision()
50 { } 48 { }
51 49
52 50
53 G4KineticTrackVector* G4VElasticCollision::Fin 51 G4KineticTrackVector* G4VElasticCollision::FinalState(const G4KineticTrack& trk1,
54 const G4KineticTrack& trk2) 52 const G4KineticTrack& trk2) const
55 { 53 {
56 const G4VAngularDistribution* angDistributio 54 const G4VAngularDistribution* angDistribution;
57 55
58 angDistribution = GetAngularDistribution(); 56 angDistribution = GetAngularDistribution();
59 57
60 58
61 G4LorentzVector pCM=trk1.Get4Momentum() + tr 59 G4LorentzVector pCM=trk1.Get4Momentum() + trk2.Get4Momentum();
62 60
63 G4LorentzRotation toLabFrame(pCM.boostVector 61 G4LorentzRotation toLabFrame(pCM.boostVector());
64 G4LorentzVector Ptmp=toLabFrame.inverse() * 62 G4LorentzVector Ptmp=toLabFrame.inverse() * trk1.Get4Momentum(); //trk1 in CMS
65 G4LorentzRotation toZ; 63 G4LorentzRotation toZ;
66 toZ.rotateZ(-Ptmp.phi()); 64 toZ.rotateZ(-Ptmp.phi());
67 toZ.rotateY(-Ptmp.theta()); 65 toZ.rotateY(-Ptmp.theta());
68 toLabFrame *= toZ.inverse(); 66 toLabFrame *= toZ.inverse();
69 67
70 G4double S = pCM.mag2(); << 68 G4double s = pCM.mag2();
71 G4double m10 = trk1.GetDefinition()->GetPDGM 69 G4double m10 = trk1.GetDefinition()->GetPDGMass();
72 G4double m20 = trk2.GetDefinition()->GetPDGM 70 G4double m20 = trk2.GetDefinition()->GetPDGMass();
73 if(S-(m10+m20)*(m10+m20) < 0) return new G4K << 71 if(s-(m10+m20)*(m10+m20) < 0) return new G4KineticTrackVector;
74 72
75 G4double m_1 = trk1.GetActualMass(); << 73 G4double m1 = trk1.GetActualMass();
76 G4double m_2 = trk2.GetActualMass(); << 74 G4double m2 = trk2.GetActualMass();
77 75
78 // Angles of outgoing particles 76 // Angles of outgoing particles
79 G4double cosTheta = angDistribution->CosThet << 77 G4double cosTheta = angDistribution->CosTheta(s,m1,m2);
80 78
81 if ( (trk1.GetDefinition() == G4Proton::Pro 79 if ( (trk1.GetDefinition() == G4Proton::Proton() || trk1.GetDefinition() == G4Neutron::Neutron() )
82 &&(trk2.GetDefinition() == G4Proton::Pro 80 &&(trk2.GetDefinition() == G4Proton::Proton() || trk2.GetDefinition() == G4Neutron::Neutron() ) )
83 { 81 {
84 if ( trk1.GetDefinition() == trk2.GetDef 82 if ( trk1.GetDefinition() == trk2.GetDefinition() )
85 { 83 {
86 if ( trk1.GetDefinition() == G4Proton::Pro 84 if ( trk1.GetDefinition() == G4Proton::Proton() )
87 { 85 {
88 // G4cout << "scatterangle pp " << cosT 86 // G4cout << "scatterangle pp " << cosTheta
89 // << " " << typeid(*angDistribu 87 // << " " << typeid(*angDistribution).name() << G4endl;
90 } else { 88 } else {
91 // G4cout << "scatterangle nn " << cosT 89 // G4cout << "scatterangle nn " << cosTheta
92 // << " " << typeid(*angDistribu 90 // << " " << typeid(*angDistribution).name() << G4endl;
93 } 91 }
94 } else { 92 } else {
95 // G4cout << "scatterangle pn " << cosTheta 93 // G4cout << "scatterangle pn " << cosTheta
96 // << " " << typeid(*angDistribu 94 // << " " << typeid(*angDistribution).name() << G4endl;
97 } 95 }
98 } else { 96 } else {
99 // G4cout << "scatterangle other " << cos 97 // G4cout << "scatterangle other " << cosTheta
100 // << " " << typeid(*angDistribu 98 // << " " << typeid(*angDistribution).name() << G4endl;
101 } 99 }
102 100
103 G4double phi = angDistribution->Phi(); 101 G4double phi = angDistribution->Phi();
104 G4double Theta = std::acos(cosTheta); 102 G4double Theta = std::acos(cosTheta);
105 103
106 // Unit vector of three-momentum 104 // Unit vector of three-momentum
107 G4ThreeVector pFinal1(std::sin(Theta)*std::c 105 G4ThreeVector pFinal1(std::sin(Theta)*std::cos(phi), std::sin(Theta)*std::sin(phi), cosTheta);
108 // Three momentum in cm system 106 // Three momentum in cm system
109 G4double pInCM = std::sqrt((S-(m10+m20)*(m10 << 107 G4double pInCM = std::sqrt((s-(m10+m20)*(m10+m20))*(s-(m10-m20)*(m10-m20))/(4.*s));
110 pFinal1 = pFinal1 * pInCM; 108 pFinal1 = pFinal1 * pInCM;
111 G4ThreeVector pFinal2 = -pFinal1; 109 G4ThreeVector pFinal2 = -pFinal1;
112 110
113 G4double eFinal1 = std::sqrt(pFinal1.mag2() 111 G4double eFinal1 = std::sqrt(pFinal1.mag2() + m10*m10);
114 G4double eFinal2 = std::sqrt(pFinal2.mag2() 112 G4double eFinal2 = std::sqrt(pFinal2.mag2() + m20*m20);
115 113
116 G4LorentzVector p4Final1(pFinal1, eFinal1); 114 G4LorentzVector p4Final1(pFinal1, eFinal1);
117 G4LorentzVector p4Final2(pFinal2, eFinal2); 115 G4LorentzVector p4Final2(pFinal2, eFinal2);
118 116
119 // Lorentz transformation 117 // Lorentz transformation
120 p4Final1 *= toLabFrame; 118 p4Final1 *= toLabFrame;
121 p4Final2 *= toLabFrame; 119 p4Final2 *= toLabFrame;
122 120
123 // Final tracks are copies of incoming ones, 121 // Final tracks are copies of incoming ones, with modified 4-momenta
124 G4KineticTrack* final1 = new G4KineticTrack( 122 G4KineticTrack* final1 = new G4KineticTrack(trk1);
125 final1->Set4Momentum(p4Final1); 123 final1->Set4Momentum(p4Final1);
126 G4KineticTrack* final2 = new G4KineticTrack( 124 G4KineticTrack* final2 = new G4KineticTrack(trk2);
127 final2->Set4Momentum(p4Final2); 125 final2->Set4Momentum(p4Final2);
128 126
129 G4KineticTrackVector* finalTracks = new G4Ki 127 G4KineticTrackVector* finalTracks = new G4KineticTrackVector;
130 finalTracks->push_back(final1); 128 finalTracks->push_back(final1);
131 finalTracks->push_back(final2); 129 finalTracks->push_back(final2);
132 130
133 return finalTracks; 131 return finalTracks;
134 } 132 }
135 133