Geant4  9.6.p02
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G4CollisionNN.cc
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27 // $Id: G4CollisionNN.cc,v 1.4 2010-03-12 15:45:18 gunter Exp $ //
28 
29 
30 #include "globals.hh"
31 #include "G4CollisionNN.hh"
32 #include "G4CollisionComposite.hh"
33 #include "G4VCollision.hh"
34 #include "G4CollisionVector.hh"
35 #include "G4KineticTrack.hh"
36 #include "G4VCrossSectionSource.hh"
37 #include "G4XNNTotal.hh"
38 #include "G4Proton.hh"
39 #include "G4Neutron.hh"
40 #include "G4CollisionNNElastic.hh"
41 #include "G4CollisionnpElastic.hh"
42 #include "G4CollisionNNToNDelta.hh"
46 #include "G4CollisionNNToNNstar.hh"
48 #include "G4Pair.hh"
49 
54 
56 {
57  components=0;
58  crossSectionSource = new G4XNNTotal();
61 }
62 
63 
65 {
66  if (components) {
67  delete components;
68  components=0;
69  }
70  delete crossSectionSource;
71  crossSectionSource = 0;
72 }
73 
74 
75 const std::vector<G4String>& G4CollisionNN::GetListOfColliders(G4int ) const
76 {
77  throw G4HadronicException(__FILE__, __LINE__, "G4CollisionNN::GetListOfColliders - Argument outside valid range");
78  return colliders1;
79 }
80 
81 
83  const G4KineticTrack& aTrk2) const
84 {
85  G4double sigma = 0.;
86 
87  // nucleon-nucleon cross-sections made for on-shell particles.
88  // here we take the kinetic energy as the quantity relevant
89  // for calculating the scattering cross-sections for off-shell hadrons
90 
92  G4LorentzVector p1 = aTrk1.Get4Momentum();
93  G4LorentzVector p2 = aTrk2.Get4Momentum();
94  G4double t1 = p1.e()-aTrk1.GetActualMass();
95  G4double t2 = p2.e()-aTrk2.GetActualMass();
96  p1.setE(t1+aTrk1.GetDefinition()->GetPDGMass());
97  p2.setE(t2+aTrk2.GetDefinition()->GetPDGMass());
98  G4KineticTrack trk1(aTrk1);
99  trk1.Set4Momentum(p1);
100  G4KineticTrack trk2(aTrk2);
101  trk2.Set4Momentum(p2);
102  if( (p1+p2).mag()<aTrk1.GetDefinition()->GetPDGMass()+aTrk2.GetDefinition()->GetPDGMass())
103  {
104  return 0.;
105  }
106 
107  if (xSource != 0)
108  {
109  // There is a cross section for this Collision
110  sigma = xSource->CrossSection(trk1,trk2);
111  }
112  return sigma;
113 }
114