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G4CollisionNN.cc
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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"
45 #include "G4CollisionNNToNNstar.hh"
47 #include "G4Pair.hh"
48 
53 
55 {
56  components=0;
57  crossSectionSource = new G4XNNTotal();
60 }
61 
62 
64 {
65  if (components) {
66  delete components;
67  components=0;
68  }
69  delete crossSectionSource;
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 
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 
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