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G4HESigmaZeroInelastic.cc
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26 // $Id$
27 
28 // G4 Process: Gheisha High Energy Collision model.
29 // This includes the high energy cascading model, the two-body-resonance model
30 // and the low energy two-body model. Not included are the low energy stuff
31 // like nuclear reactions, nuclear fission without any cascading and all
32 // processes for particles at rest.
33 // First work done by J.L.Chuma and F.W.Jones, TRIUMF, June 96.
34 // H. Fesefeldt, RWTH-Aachen, 23-October-1996
35 
37 #include "globals.hh"
38 #include "G4ios.hh"
39 #include "G4Gamma.hh"
40 
42 {
43  outFile << "G4HESigmaZeroInelastic is one of the High Energy\n"
44  << "Parameterized (HEP) models used to implement inelastic\n"
45  << "Sigma0 scattering from nuclei. It is a re-engineered\n"
46  << "version of the GHEISHA code of H. Fesefeldt. It divides the\n"
47  << "initial collision products into backward- and forward-going\n"
48  << "clusters which are then decayed into final state hadrons.\n"
49  << "The model does not conserve energy on an event-by-event\n"
50  << "basis. It may be applied to Sigma0 with initial energies\n"
51  << "above 20 GeV.\n";
52 }
53 
54 
57  G4Nucleus& targetNucleus)
58 {
59  G4HEVector* pv = new G4HEVector[MAXPART];
60  const G4HadProjectile* aParticle = &aTrack;
61  G4HEVector incidentParticle(aParticle);
62 
63  G4HELambdaInelastic theLambdaInelastic;
64  theLambdaInelastic.SetMaxNumberOfSecondaries(MAXPART);
65  theLambdaInelastic.SetVerboseLevel(verboseLevel);
66 
67  G4double incidentTotalMomentum = incidentParticle.getTotalMomentum();
68  G4double pgam = G4UniformRand()*incidentTotalMomentum*0.75;
69  G4HEVector incidentLambda;
70  incidentLambda.SmulAndUpdate(incidentParticle,
71  (incidentTotalMomentum - pgam)/incidentTotalMomentum);
72  G4DynamicParticle* aLambda = new G4DynamicParticle();
73  aLambda->SetDefinition(G4Lambda::Lambda());
74  aLambda->SetMomentum(incidentLambda.getMomentum());
75  G4HadProjectile aLambdaTrack(*aLambda);
76  G4HadFinalState* result =
77  theLambdaInelastic.ApplyYourself(aLambdaTrack, targetNucleus);
78  vecLength = theLambdaInelastic.GetNumberOfSecondaries();
79 
80  pv[vecLength] = Gamma;
81  pv[vecLength].setMomentum(incidentParticle.getMomentum());
82  pv[vecLength].SmulAndUpdate( pv[vecLength],pgam/incidentTotalMomentum);
83  G4DynamicParticle* aPhoton = new G4DynamicParticle();
84  aPhoton->SetDefinition(G4Gamma::Gamma());
85  aPhoton->SetMomentum(pv[vecLength].getMomentum());
86  result->AddSecondary(aPhoton);
87  delete [] pv;
88  return result;
89 }
90