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>> 27 // $Id: G4VElasticCollision.cc,v 1.3 2006-06-29 20:41:53 gunter Exp $ //
27 28
28 #include "globals.hh" 29 #include "globals.hh"
29 #include "G4VElasticCollision.hh" 30 #include "G4VElasticCollision.hh"
30 #include "G4KineticTrack.hh" 31 #include "G4KineticTrack.hh"
31 #include "G4VCrossSectionSource.hh" 32 #include "G4VCrossSectionSource.hh"
32 #include "G4Proton.hh" 33 #include "G4Proton.hh"
33 #include "G4Neutron.hh" 34 #include "G4Neutron.hh"
34 #include "G4XNNElastic.hh" 35 #include "G4XNNElastic.hh"
35 #include "G4AngularDistribution.hh" 36 #include "G4AngularDistribution.hh"
36 #include "G4ThreeVector.hh" 37 #include "G4ThreeVector.hh"
37 #include "G4LorentzVector.hh" 38 #include "G4LorentzVector.hh"
38 #include "G4LorentzRotation.hh" 39 #include "G4LorentzRotation.hh"
39 #include "G4KineticTrackVector.hh" 40 #include "G4KineticTrackVector.hh"
40 #include "G4AngularDistributionNP.hh" // np 41 #include "G4AngularDistributionNP.hh" // np scattering
41 #include "G4AngularDistributionPP.hh" // nn 42 #include "G4AngularDistributionPP.hh" // nn and pp scattering
42 #include <typeinfo> 43 #include <typeinfo>
43 44
44 G4VElasticCollision::G4VElasticCollision() 45 G4VElasticCollision::G4VElasticCollision()
45 { 46 {
46 } 47 }
47 48
48 49
49 G4VElasticCollision::~G4VElasticCollision() 50 G4VElasticCollision::~G4VElasticCollision()
50 { } 51 { }
51 52
52 53
53 G4KineticTrackVector* G4VElasticCollision::Fin 54 G4KineticTrackVector* G4VElasticCollision::FinalState(const G4KineticTrack& trk1,
54 const G4KineticTrack& trk2) 55 const G4KineticTrack& trk2) const
55 { 56 {
56 const G4VAngularDistribution* angDistributio 57 const G4VAngularDistribution* angDistribution;
57 58
58 angDistribution = GetAngularDistribution(); 59 angDistribution = GetAngularDistribution();
59 60
60 61
61 G4LorentzVector pCM=trk1.Get4Momentum() + tr 62 G4LorentzVector pCM=trk1.Get4Momentum() + trk2.Get4Momentum();
62 63
63 G4LorentzRotation toLabFrame(pCM.boostVector 64 G4LorentzRotation toLabFrame(pCM.boostVector());
64 G4LorentzVector Ptmp=toLabFrame.inverse() * 65 G4LorentzVector Ptmp=toLabFrame.inverse() * trk1.Get4Momentum(); //trk1 in CMS
65 G4LorentzRotation toZ; 66 G4LorentzRotation toZ;
66 toZ.rotateZ(-Ptmp.phi()); 67 toZ.rotateZ(-Ptmp.phi());
67 toZ.rotateY(-Ptmp.theta()); 68 toZ.rotateY(-Ptmp.theta());
68 toLabFrame *= toZ.inverse(); 69 toLabFrame *= toZ.inverse();
69 70
70 G4double S = pCM.mag2(); 71 G4double S = pCM.mag2();
71 G4double m10 = trk1.GetDefinition()->GetPDGM 72 G4double m10 = trk1.GetDefinition()->GetPDGMass();
72 G4double m20 = trk2.GetDefinition()->GetPDGM 73 G4double m20 = trk2.GetDefinition()->GetPDGMass();
73 if(S-(m10+m20)*(m10+m20) < 0) return new G4K 74 if(S-(m10+m20)*(m10+m20) < 0) return new G4KineticTrackVector;
74 75
75 G4double m_1 = trk1.GetActualMass(); 76 G4double m_1 = trk1.GetActualMass();
76 G4double m_2 = trk2.GetActualMass(); 77 G4double m_2 = trk2.GetActualMass();
77 78
78 // Angles of outgoing particles 79 // Angles of outgoing particles
79 G4double cosTheta = angDistribution->CosThet 80 G4double cosTheta = angDistribution->CosTheta(S,m_1,m_2);
80 81
81 if ( (trk1.GetDefinition() == G4Proton::Pro 82 if ( (trk1.GetDefinition() == G4Proton::Proton() || trk1.GetDefinition() == G4Neutron::Neutron() )
82 &&(trk2.GetDefinition() == G4Proton::Pro 83 &&(trk2.GetDefinition() == G4Proton::Proton() || trk2.GetDefinition() == G4Neutron::Neutron() ) )
83 { 84 {
84 if ( trk1.GetDefinition() == trk2.GetDef 85 if ( trk1.GetDefinition() == trk2.GetDefinition() )
85 { 86 {
86 if ( trk1.GetDefinition() == G4Proton::Pro 87 if ( trk1.GetDefinition() == G4Proton::Proton() )
87 { 88 {
88 // G4cout << "scatterangle pp " << cosT 89 // G4cout << "scatterangle pp " << cosTheta
89 // << " " << typeid(*angDistribu 90 // << " " << typeid(*angDistribution).name() << G4endl;
90 } else { 91 } else {
91 // G4cout << "scatterangle nn " << cosT 92 // G4cout << "scatterangle nn " << cosTheta
92 // << " " << typeid(*angDistribu 93 // << " " << typeid(*angDistribution).name() << G4endl;
93 } 94 }
94 } else { 95 } else {
95 // G4cout << "scatterangle pn " << cosTheta 96 // G4cout << "scatterangle pn " << cosTheta
96 // << " " << typeid(*angDistribu 97 // << " " << typeid(*angDistribution).name() << G4endl;
97 } 98 }
98 } else { 99 } else {
99 // G4cout << "scatterangle other " << cos 100 // G4cout << "scatterangle other " << cosTheta
100 // << " " << typeid(*angDistribu 101 // << " " << typeid(*angDistribution).name() << G4endl;
101 } 102 }
102 103
103 G4double phi = angDistribution->Phi(); 104 G4double phi = angDistribution->Phi();
104 G4double Theta = std::acos(cosTheta); 105 G4double Theta = std::acos(cosTheta);
105 106
106 // Unit vector of three-momentum 107 // Unit vector of three-momentum
107 G4ThreeVector pFinal1(std::sin(Theta)*std::c 108 G4ThreeVector pFinal1(std::sin(Theta)*std::cos(phi), std::sin(Theta)*std::sin(phi), cosTheta);
108 // Three momentum in cm system 109 // Three momentum in cm system
109 G4double pInCM = std::sqrt((S-(m10+m20)*(m10 110 G4double pInCM = std::sqrt((S-(m10+m20)*(m10+m20))*(S-(m10-m20)*(m10-m20))/(4.*S));
110 pFinal1 = pFinal1 * pInCM; 111 pFinal1 = pFinal1 * pInCM;
111 G4ThreeVector pFinal2 = -pFinal1; 112 G4ThreeVector pFinal2 = -pFinal1;
112 113
113 G4double eFinal1 = std::sqrt(pFinal1.mag2() 114 G4double eFinal1 = std::sqrt(pFinal1.mag2() + m10*m10);
114 G4double eFinal2 = std::sqrt(pFinal2.mag2() 115 G4double eFinal2 = std::sqrt(pFinal2.mag2() + m20*m20);
115 116
116 G4LorentzVector p4Final1(pFinal1, eFinal1); 117 G4LorentzVector p4Final1(pFinal1, eFinal1);
117 G4LorentzVector p4Final2(pFinal2, eFinal2); 118 G4LorentzVector p4Final2(pFinal2, eFinal2);
118 119
119 // Lorentz transformation 120 // Lorentz transformation
120 p4Final1 *= toLabFrame; 121 p4Final1 *= toLabFrame;
121 p4Final2 *= toLabFrame; 122 p4Final2 *= toLabFrame;
122 123
123 // Final tracks are copies of incoming ones, 124 // Final tracks are copies of incoming ones, with modified 4-momenta
124 G4KineticTrack* final1 = new G4KineticTrack( 125 G4KineticTrack* final1 = new G4KineticTrack(trk1);
125 final1->Set4Momentum(p4Final1); 126 final1->Set4Momentum(p4Final1);
126 G4KineticTrack* final2 = new G4KineticTrack( 127 G4KineticTrack* final2 = new G4KineticTrack(trk2);
127 final2->Set4Momentum(p4Final2); 128 final2->Set4Momentum(p4Final2);
128 129
129 G4KineticTrackVector* finalTracks = new G4Ki 130 G4KineticTrackVector* finalTracks = new G4KineticTrackVector;
130 finalTracks->push_back(final1); 131 finalTracks->push_back(final1);
131 finalTracks->push_back(final2); 132 finalTracks->push_back(final2);
132 133
133 return finalTracks; 134 return finalTracks;
134 } 135 }
135 136