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G4RPGPionSuppression.cc
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27 
28 #include <iostream>
29 #include <signal.h>
30 
31 #include "G4RPGPionSuppression.hh"
32 #include "G4SystemOfUnits.hh"
33 #include "Randomize.hh"
35 
37  : G4RPGReaction() {}
38 
39 
41 ReactionStage(const G4HadProjectile* /*originalIncident*/,
42  G4ReactionProduct& modifiedOriginal,
43  G4bool& incidentHasChanged,
44  const G4DynamicParticle* /*originalTarget*/,
45  G4ReactionProduct& targetParticle,
46  G4bool& targetHasChanged,
47  const G4Nucleus& targetNucleus,
48  G4ReactionProduct& currentParticle,
50  G4int& vecLen,
51  G4bool /*leadFlag*/,
52  G4ReactionProduct& /*leadingStrangeParticle*/)
53 {
54  // This code was originally in the fortran code TWOCLU
55  //
56  // Suppress charged pions, for various reasons
57  //
58  G4double mOriginal = modifiedOriginal.GetMass()/GeV;
59  G4double etOriginal = modifiedOriginal.GetTotalEnergy()/GeV;
60  G4double targetMass = targetParticle.GetDefinition()->GetPDGMass()/GeV;
61  G4double cmEnergy = std::sqrt( mOriginal*mOriginal + targetMass*targetMass +
62  2.0*targetMass*etOriginal );
63  G4double eAvailable = cmEnergy - mOriginal - targetMass;
64  for (G4int i = 0; i < vecLen; i++) eAvailable -= vec[i]->GetMass()/GeV;
65 
66  const G4double atomicWeight = targetNucleus.GetA_asInt();
67  const G4double atomicNumber = targetNucleus.GetZ_asInt();
68  const G4double pOriginal = modifiedOriginal.GetTotalMomentum()/GeV;
69 
75  G4double piMass = aPiPlus->GetPDGMass()/GeV;
76  G4double nucleonMass = aNeutron->GetPDGMass()/GeV;
77 
78  const G4bool antiTest =
79  modifiedOriginal.GetDefinition() != G4AntiProton::AntiProton() &&
80  modifiedOriginal.GetDefinition() != G4AntiNeutron::AntiNeutron() &&
81  modifiedOriginal.GetDefinition() != G4AntiLambda::AntiLambda() &&
82  modifiedOriginal.GetDefinition() != G4AntiSigmaPlus::AntiSigmaPlus() &&
83  modifiedOriginal.GetDefinition() != G4AntiSigmaMinus::AntiSigmaMinus() &&
84  modifiedOriginal.GetDefinition() != G4AntiXiZero::AntiXiZero() &&
85  modifiedOriginal.GetDefinition() != G4AntiXiMinus::AntiXiMinus() &&
86  modifiedOriginal.GetDefinition() != G4AntiOmegaMinus::AntiOmegaMinus();
87 
88  if( antiTest && (
89  currentParticle.GetDefinition() == aPiPlus ||
90  currentParticle.GetDefinition() == aPiZero ||
91  currentParticle.GetDefinition() == aPiMinus ) &&
92  ( G4UniformRand() <= (10.0-pOriginal)/6.0 ) &&
93  ( G4UniformRand() <= atomicWeight/300.0 ) )
94  {
95  if (eAvailable > nucleonMass - piMass) {
96  if( G4UniformRand() > atomicNumber/atomicWeight )
97  currentParticle.SetDefinitionAndUpdateE( aNeutron );
98  else
99  currentParticle.SetDefinitionAndUpdateE( aProton );
100  incidentHasChanged = true;
101  }
102  }
103 
104  if( antiTest && (
105  targetParticle.GetDefinition() == aPiPlus ||
106  targetParticle.GetDefinition() == aPiZero ||
107  targetParticle.GetDefinition() == aPiMinus ) &&
108  ( G4UniformRand() <= (10.0-pOriginal)/6.0 ) &&
109  ( G4UniformRand() <= atomicWeight/300.0 ) )
110  {
111  if (eAvailable > nucleonMass - piMass) {
112  if( G4UniformRand() > atomicNumber/atomicWeight )
113  targetParticle.SetDefinitionAndUpdateE( aNeutron );
114  else
115  targetParticle.SetDefinitionAndUpdateE( aProton );
116  targetHasChanged = true;
117  }
118  }
119 
120  for( G4int i=0; i<vecLen; ++i )
121  {
122  if( antiTest && (
123  vec[i]->GetDefinition() == aPiPlus ||
124  vec[i]->GetDefinition() == aPiZero ||
125  vec[i]->GetDefinition() == aPiMinus ) &&
126  ( G4UniformRand() <= (10.0-pOriginal)/6.0 ) &&
127  ( G4UniformRand() <= atomicWeight/300.0 ) )
128  {
129  if (eAvailable > nucleonMass - piMass) {
130  if( G4UniformRand() > atomicNumber/atomicWeight )
131  vec[i]->SetDefinitionAndUpdateE( aNeutron );
132  else
133  vec[i]->SetDefinitionAndUpdateE( aProton );
134  }
135  }
136  }
137 
138  return true;
139 }
140 
141 
142  /* end of file */