| Geant4 Cross Reference |
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25 //
26 //
27
28
29 #include "globals.hh"
30 #include "G4CollisionNN.hh"
31 #include "G4CollisionComposite.hh"
32 #include "G4VCollision.hh"
33 #include "G4CollisionVector.hh"
34 #include "G4KineticTrack.hh"
35 #include "G4VCrossSectionSource.hh"
36 #include "G4XNNTotal.hh"
37 #include "G4Proton.hh"
38 #include "G4Neutron.hh"
39 #include "G4CollisionNNElastic.hh"
40 #include "G4CollisionnpElastic.hh"
41 #include "G4CollisionNNToNDelta.hh"
42 #include "G4CollisionNNToDeltaDelta.hh"
43 #include "G4CollisionNNToNDeltastar.hh"
44 #include "G4CollisionNNToDeltaDeltastar.hh"
45 #include "G4CollisionNNToNNstar.hh"
46 #include "G4CollisionNNToDeltaNstar.hh"
47 #include "G4Pair.hh"
48
49 typedef GROUP8(G4CollisionnpElastic, G4CollisionNNElastic,
50 G4CollisionNNToNDelta, G4CollisionNNToDeltaDelta,
51 G4CollisionNNToNDeltastar, G4CollisionNNToDeltaDeltastar,
52 G4CollisionNNToNNstar, G4CollisionNNToDeltaNstar) theChannels;
53
54 G4CollisionNN::G4CollisionNN()
55 {
56 components=0;
57 crossSectionSource = new G4XNNTotal();
58 G4CollisionComposite::Register aR;
59 G4ForEach<theChannels>::Apply(&aR, this);
60 }
61
62
63 G4CollisionNN::~G4CollisionNN()
64 {
65 if (components) {
66 delete components;
67 components=0;
68 }
69 delete crossSectionSource;
70 crossSectionSource = 0;
71 }
72
73
74 const std::vector<G4String>& G4CollisionNN::GetListOfColliders(G4int ) const
75 {
76 throw G4HadronicException(__FILE__, __LINE__, "G4CollisionNN::GetListOfColliders - Argument outside valid range");
77 return colliders1;
78 }
79
80
81 G4double G4CollisionNN::CrossSection(const G4KineticTrack& aTrk1,
82 const G4KineticTrack& aTrk2) const
83 {
84 G4double sigma = 0.;
85
86 // nucleon-nucleon cross-sections made for on-shell particles.
87 // here we take the kinetic energy as the quantity relevant
88 // for calculating the scattering cross-sections for off-shell hadrons
89
90 const G4VCrossSectionSource* xSource = GetCrossSectionSource();
91 G4LorentzVector p1 = aTrk1.Get4Momentum();
92 G4LorentzVector p2 = aTrk2.Get4Momentum();
93 G4double t1 = p1.e()-aTrk1.GetActualMass();
94 G4double t2 = p2.e()-aTrk2.GetActualMass();
95 p1.setE(t1+aTrk1.GetDefinition()->GetPDGMass());
96 p2.setE(t2+aTrk2.GetDefinition()->GetPDGMass());
97 G4KineticTrack trk1(aTrk1);
98 trk1.Set4Momentum(p1);
99 G4KineticTrack trk2(aTrk2);
100 trk2.Set4Momentum(p2);
101 if( (p1+p2).mag()<aTrk1.GetDefinition()->GetPDGMass()+aTrk2.GetDefinition()->GetPDGMass())
102 {
103 return 0.;
104 }
105
106 if (xSource != 0)
107 {
108 // There is a cross section for this Collision
109 sigma = xSource->CrossSection(trk1,trk2);
110 }
111 return sigma;
112 }
113
114