| Geant4 Cross Reference |
1 // 1 //
2 // ******************************************* 2 // ********************************************************************
3 // * License and Disclaimer 3 // * License and Disclaimer *
4 // * 4 // * *
5 // * The Geant4 software is copyright of th 5 // * The Geant4 software is copyright of the Copyright Holders of *
6 // * the Geant4 Collaboration. It is provided 6 // * the Geant4 Collaboration. It is provided under the terms and *
7 // * conditions of the Geant4 Software License 7 // * conditions of the Geant4 Software License, included in the file *
8 // * LICENSE and available at http://cern.ch/ 8 // * LICENSE and available at http://cern.ch/geant4/license . These *
9 // * include a list of copyright holders. 9 // * include a list of copyright holders. *
10 // * 10 // * *
11 // * Neither the authors of this software syst 11 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing fin 12 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warran 13 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assum 14 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file 15 // * use. Please see the license in the file LICENSE and URL above *
16 // * for the full disclaimer and the limitatio 16 // * for the full disclaimer and the limitation of liability. *
17 // * 17 // * *
18 // * This code implementation is the result 18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboratio 19 // * technical work of the GEANT4 collaboration. *
20 // * By using, copying, modifying or distri 20 // * By using, copying, modifying or distributing the software (or *
21 // * any work based on the software) you ag 21 // * any work based on the software) you agree to acknowledge its *
22 // * use in resulting scientific publicati 22 // * use in resulting scientific publications, and indicate your *
23 // * acceptance of all terms of the Geant4 Sof 23 // * acceptance of all terms of the Geant4 Software license. *
24 // ******************************************* 24 // ********************************************************************
25 // 25 //
26 // 26 //
27 27
28 #include "globals.hh" 28 #include "globals.hh"
29 #include "G4VElasticCollision.hh" 29 #include "G4VElasticCollision.hh"
30 #include "G4KineticTrack.hh" 30 #include "G4KineticTrack.hh"
31 #include "G4VCrossSectionSource.hh" 31 #include "G4VCrossSectionSource.hh"
32 #include "G4Proton.hh" 32 #include "G4Proton.hh"
33 #include "G4Neutron.hh" 33 #include "G4Neutron.hh"
34 #include "G4XNNElastic.hh" 34 #include "G4XNNElastic.hh"
35 #include "G4AngularDistribution.hh" 35 #include "G4AngularDistribution.hh"
36 #include "G4ThreeVector.hh" 36 #include "G4ThreeVector.hh"
37 #include "G4LorentzVector.hh" 37 #include "G4LorentzVector.hh"
38 #include "G4LorentzRotation.hh" 38 #include "G4LorentzRotation.hh"
39 #include "G4KineticTrackVector.hh" 39 #include "G4KineticTrackVector.hh"
40 #include "G4AngularDistributionNP.hh" // np 40 #include "G4AngularDistributionNP.hh" // np scattering
41 #include "G4AngularDistributionPP.hh" // nn 41 #include "G4AngularDistributionPP.hh" // nn and pp scattering
42 #include <typeinfo> 42 #include <typeinfo>
43 43
44 G4VElasticCollision::G4VElasticCollision() 44 G4VElasticCollision::G4VElasticCollision()
45 { 45 {
46 } 46 }
47 47
48 48
49 G4VElasticCollision::~G4VElasticCollision() 49 G4VElasticCollision::~G4VElasticCollision()
50 { } 50 { }
51 51
52 52
53 G4KineticTrackVector* G4VElasticCollision::Fin 53 G4KineticTrackVector* G4VElasticCollision::FinalState(const G4KineticTrack& trk1,
54 const G4KineticTrack& trk2) 54 const G4KineticTrack& trk2) const
55 { 55 {
56 const G4VAngularDistribution* angDistributio 56 const G4VAngularDistribution* angDistribution;
57 57
58 angDistribution = GetAngularDistribution(); 58 angDistribution = GetAngularDistribution();
59 59
60 60
61 G4LorentzVector pCM=trk1.Get4Momentum() + tr 61 G4LorentzVector pCM=trk1.Get4Momentum() + trk2.Get4Momentum();
62 62
63 G4LorentzRotation toLabFrame(pCM.boostVector 63 G4LorentzRotation toLabFrame(pCM.boostVector());
64 G4LorentzVector Ptmp=toLabFrame.inverse() * 64 G4LorentzVector Ptmp=toLabFrame.inverse() * trk1.Get4Momentum(); //trk1 in CMS
65 G4LorentzRotation toZ; 65 G4LorentzRotation toZ;
66 toZ.rotateZ(-Ptmp.phi()); 66 toZ.rotateZ(-Ptmp.phi());
67 toZ.rotateY(-Ptmp.theta()); 67 toZ.rotateY(-Ptmp.theta());
68 toLabFrame *= toZ.inverse(); 68 toLabFrame *= toZ.inverse();
69 69
70 G4double S = pCM.mag2(); 70 G4double S = pCM.mag2();
71 G4double m10 = trk1.GetDefinition()->GetPDGM 71 G4double m10 = trk1.GetDefinition()->GetPDGMass();
72 G4double m20 = trk2.GetDefinition()->GetPDGM 72 G4double m20 = trk2.GetDefinition()->GetPDGMass();
73 if(S-(m10+m20)*(m10+m20) < 0) return new G4K 73 if(S-(m10+m20)*(m10+m20) < 0) return new G4KineticTrackVector;
74 74
75 G4double m_1 = trk1.GetActualMass(); 75 G4double m_1 = trk1.GetActualMass();
76 G4double m_2 = trk2.GetActualMass(); 76 G4double m_2 = trk2.GetActualMass();
77 77
78 // Angles of outgoing particles 78 // Angles of outgoing particles
79 G4double cosTheta = angDistribution->CosThet 79 G4double cosTheta = angDistribution->CosTheta(S,m_1,m_2);
80 80
81 if ( (trk1.GetDefinition() == G4Proton::Pro 81 if ( (trk1.GetDefinition() == G4Proton::Proton() || trk1.GetDefinition() == G4Neutron::Neutron() )
82 &&(trk2.GetDefinition() == G4Proton::Pro 82 &&(trk2.GetDefinition() == G4Proton::Proton() || trk2.GetDefinition() == G4Neutron::Neutron() ) )
83 { 83 {
84 if ( trk1.GetDefinition() == trk2.GetDef 84 if ( trk1.GetDefinition() == trk2.GetDefinition() )
85 { 85 {
86 if ( trk1.GetDefinition() == G4Proton::Pro 86 if ( trk1.GetDefinition() == G4Proton::Proton() )
87 { 87 {
88 // G4cout << "scatterangle pp " << cosT 88 // G4cout << "scatterangle pp " << cosTheta
89 // << " " << typeid(*angDistribu 89 // << " " << typeid(*angDistribution).name() << G4endl;
90 } else { 90 } else {
91 // G4cout << "scatterangle nn " << cosT 91 // G4cout << "scatterangle nn " << cosTheta
92 // << " " << typeid(*angDistribu 92 // << " " << typeid(*angDistribution).name() << G4endl;
93 } 93 }
94 } else { 94 } else {
95 // G4cout << "scatterangle pn " << cosTheta 95 // G4cout << "scatterangle pn " << cosTheta
96 // << " " << typeid(*angDistribu 96 // << " " << typeid(*angDistribution).name() << G4endl;
97 } 97 }
98 } else { 98 } else {
99 // G4cout << "scatterangle other " << cos 99 // G4cout << "scatterangle other " << cosTheta
100 // << " " << typeid(*angDistribu 100 // << " " << typeid(*angDistribution).name() << G4endl;
101 } 101 }
102 102
103 G4double phi = angDistribution->Phi(); 103 G4double phi = angDistribution->Phi();
104 G4double Theta = std::acos(cosTheta); 104 G4double Theta = std::acos(cosTheta);
105 105
106 // Unit vector of three-momentum 106 // Unit vector of three-momentum
107 G4ThreeVector pFinal1(std::sin(Theta)*std::c 107 G4ThreeVector pFinal1(std::sin(Theta)*std::cos(phi), std::sin(Theta)*std::sin(phi), cosTheta);
108 // Three momentum in cm system 108 // Three momentum in cm system
109 G4double pInCM = std::sqrt((S-(m10+m20)*(m10 109 G4double pInCM = std::sqrt((S-(m10+m20)*(m10+m20))*(S-(m10-m20)*(m10-m20))/(4.*S));
110 pFinal1 = pFinal1 * pInCM; 110 pFinal1 = pFinal1 * pInCM;
111 G4ThreeVector pFinal2 = -pFinal1; 111 G4ThreeVector pFinal2 = -pFinal1;
112 112
113 G4double eFinal1 = std::sqrt(pFinal1.mag2() 113 G4double eFinal1 = std::sqrt(pFinal1.mag2() + m10*m10);
114 G4double eFinal2 = std::sqrt(pFinal2.mag2() 114 G4double eFinal2 = std::sqrt(pFinal2.mag2() + m20*m20);
115 115
116 G4LorentzVector p4Final1(pFinal1, eFinal1); 116 G4LorentzVector p4Final1(pFinal1, eFinal1);
117 G4LorentzVector p4Final2(pFinal2, eFinal2); 117 G4LorentzVector p4Final2(pFinal2, eFinal2);
118 118
119 // Lorentz transformation 119 // Lorentz transformation
120 p4Final1 *= toLabFrame; 120 p4Final1 *= toLabFrame;
121 p4Final2 *= toLabFrame; 121 p4Final2 *= toLabFrame;
122 122
123 // Final tracks are copies of incoming ones, 123 // Final tracks are copies of incoming ones, with modified 4-momenta
124 G4KineticTrack* final1 = new G4KineticTrack( 124 G4KineticTrack* final1 = new G4KineticTrack(trk1);
125 final1->Set4Momentum(p4Final1); 125 final1->Set4Momentum(p4Final1);
126 G4KineticTrack* final2 = new G4KineticTrack( 126 G4KineticTrack* final2 = new G4KineticTrack(trk2);
127 final2->Set4Momentum(p4Final2); 127 final2->Set4Momentum(p4Final2);
128 128
129 G4KineticTrackVector* finalTracks = new G4Ki 129 G4KineticTrackVector* finalTracks = new G4KineticTrackVector;
130 finalTracks->push_back(final1); 130 finalTracks->push_back(final1);
131 finalTracks->push_back(final2); 131 finalTracks->push_back(final2);
132 132
133 return finalTracks; 133 return finalTracks;
134 } 134 }
135 135