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24 | // ******************************************************************** |
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25 | // |
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26 | // $Id: G4LowEIonFragmentation.cc,v 1.7 2010/09/08 16:38:09 gunter Exp $ |
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27 | // GEANT4 tag $Name: geant4-09-03-ref-09 $ |
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28 | // |
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29 | //--------------------------------------------------------------------------- |
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30 | // |
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31 | // ClassName: G4LowEIonFragmentation |
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32 | // |
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33 | // Author: H.P. Wellisch |
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34 | // |
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35 | // Modified: |
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36 | // 02 Jun 2010 M. A. Cortes Giraldo fix: particlesFromTarget must be |
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37 | // accounted for as particles of initial compound nucleus |
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38 | |
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39 | #include "G4LowEIonFragmentation.hh" |
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40 | #include <algorithm> |
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41 | |
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42 | G4int G4LowEIonFragmentation::hits = 0; |
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43 | G4int G4LowEIonFragmentation::totalTries = 0; |
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44 | G4double G4LowEIonFragmentation::area = 0; |
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45 | |
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46 | G4LowEIonFragmentation::G4LowEIonFragmentation(G4ExcitationHandler * const value) |
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47 | { |
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48 | theHandler = value; |
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49 | theModel = new G4PreCompoundModel(theHandler); |
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50 | } |
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51 | |
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52 | G4LowEIonFragmentation::G4LowEIonFragmentation() |
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53 | { |
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54 | theHandler = new G4ExcitationHandler; |
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55 | theModel = new G4PreCompoundModel(theHandler); |
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56 | } |
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57 | |
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58 | G4LowEIonFragmentation::~G4LowEIonFragmentation() |
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59 | { |
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60 | delete theModel; |
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61 | } |
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62 | |
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63 | G4HadFinalState * G4LowEIonFragmentation:: |
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64 | ApplyYourself(const G4HadProjectile & thePrimary, G4Nucleus & theNucleus) |
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65 | { |
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66 | area = 0; |
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67 | // initialize the particle change |
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68 | theResult.Clear(); |
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69 | theResult.SetStatusChange( stopAndKill ); |
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70 | theResult.SetEnergyChange( 0.0 ); |
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71 | |
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72 | // Get Target A, Z |
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73 | G4int aTargetA = theNucleus.GetA_asInt(); |
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74 | G4int aTargetZ = theNucleus.GetZ_asInt(); |
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75 | |
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76 | // Get Projectile A, Z |
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77 | G4int aProjectileA = thePrimary.GetDefinition()->GetBaryonNumber(); |
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78 | G4int aProjectileZ = G4lrint(thePrimary.GetDefinition()->GetPDGCharge()); |
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79 | |
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80 | // Get Maximum radius of both |
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81 | |
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82 | G4Fancy3DNucleus aPrim; |
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83 | aPrim.Init(aProjectileA, aProjectileZ); |
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84 | G4double projectileOuterRadius = aPrim.GetOuterRadius(); |
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85 | |
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86 | G4Fancy3DNucleus aTarg; |
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87 | aTarg.Init(aTargetA, aTargetZ); |
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88 | G4double targetOuterRadius = aTarg.GetOuterRadius(); |
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89 | |
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90 | // Get the Impact parameter |
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91 | G4int particlesFromProjectile = 0; |
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92 | G4int chargedFromProjectile = 0; |
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93 | G4double impactParameter = 0; |
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94 | G4double x,y; |
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95 | G4Nucleon * pNucleon; |
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96 | // need at lease one particle from the projectile model beyond the |
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97 | // projectileHorizon. |
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98 | while(0==particlesFromProjectile) |
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99 | { |
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100 | do |
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101 | { |
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102 | x = 2*G4UniformRand() - 1; |
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103 | y = 2*G4UniformRand() - 1; |
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104 | } |
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105 | while(x*x + y*y > 1); |
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106 | impactParameter = std::sqrt(x*x+y*y)*(targetOuterRadius+projectileOuterRadius); |
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107 | totalTries++; |
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108 | area = pi*(targetOuterRadius+projectileOuterRadius)* |
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109 | (targetOuterRadius+projectileOuterRadius); |
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110 | G4double projectileHorizon = impactParameter-targetOuterRadius; |
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111 | |
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112 | // Empirical boundary transparency. |
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113 | G4double empirical = G4UniformRand(); |
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114 | if(projectileHorizon/projectileOuterRadius>empirical) continue; |
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115 | |
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116 | // Calculate the number of nucleons involved in collision |
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117 | // From projectile |
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118 | aPrim.StartLoop(); |
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119 | while((pNucleon = aPrim.GetNextNucleon())) |
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120 | { |
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121 | if(pNucleon->GetPosition().y()>projectileHorizon) |
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122 | { |
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123 | // We have one |
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124 | particlesFromProjectile++; |
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125 | if(pNucleon->GetParticleType()==G4Proton::ProtonDefinition()) |
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126 | { |
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127 | chargedFromProjectile++; |
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128 | } |
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129 | } |
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130 | } |
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131 | } |
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132 | hits++; |
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133 | |
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134 | // From target: |
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135 | G4double targetHorizon = impactParameter-projectileOuterRadius; |
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136 | G4int chargedFromTarget = 0; |
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137 | G4int particlesFromTarget = 0; |
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138 | aTarg.StartLoop(); |
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139 | while((pNucleon = aTarg.GetNextNucleon())) |
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140 | { |
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141 | if(pNucleon->GetPosition().y()>targetHorizon) |
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142 | { |
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143 | // We have one |
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144 | particlesFromTarget++; |
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145 | if(pNucleon->GetParticleType()==G4Proton::ProtonDefinition()) |
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146 | { |
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147 | chargedFromTarget++; |
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148 | } |
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149 | } |
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150 | } |
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151 | |
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152 | // Energy sharing between projectile and target. Note that this is a quite simplistic kinetically. |
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153 | G4ThreeVector exciton3Momentum = thePrimary.Get4Momentum().vect(); |
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154 | exciton3Momentum *= particlesFromProjectile/aProjectileA; |
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155 | |
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156 | G4double compoundEnergy = thePrimary.GetTotalEnergy()*particlesFromProjectile/aProjectileA; |
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157 | G4double targetMass = G4ParticleTable::GetParticleTable() |
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158 | ->GetIonTable()->GetIonMass(aTargetZ, aTargetA); |
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159 | compoundEnergy += targetMass; |
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160 | G4LorentzVector fragment4Momentum(exciton3Momentum, compoundEnergy); |
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161 | |
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162 | // take the nucleons and fill the Fragments |
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163 | G4Fragment anInitialState; |
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164 | anInitialState.SetZandA_asInt(aTargetZ+chargedFromProjectile, |
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165 | aTargetA+particlesFromProjectile); |
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166 | // M.A. Cortes fix |
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167 | //anInitialState.SetNumberOfParticles(particlesFromProjectile); |
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168 | anInitialState.SetNumberOfParticles(particlesFromProjectile+particlesFromTarget); |
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169 | anInitialState.SetNumberOfHoles(particlesFromTarget); |
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170 | anInitialState.SetNumberOfCharged(chargedFromProjectile + chargedFromTarget); |
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171 | anInitialState.SetMomentum(fragment4Momentum); |
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172 | |
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173 | // Fragment the Fragment using Pre-compound |
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174 | G4ReactionProductVector* thePreCompoundResult; |
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175 | thePreCompoundResult = theModel->DeExcite(anInitialState); |
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176 | |
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177 | // De-excite the projectile using ExcitationHandler |
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178 | |
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179 | G4ReactionProductVector * theExcitationResult = 0; |
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180 | if(particlesFromProjectile != aProjectileA) |
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181 | { |
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182 | G4ThreeVector residual3Momentum = thePrimary.Get4Momentum().vect(); |
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183 | residual3Momentum -= exciton3Momentum; |
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184 | G4double residualEnergy = thePrimary.GetTotalEnergy()*(1.-particlesFromProjectile/aProjectileA); |
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185 | G4LorentzVector residual4Momentum(residual3Momentum, residualEnergy); |
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186 | |
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187 | G4Fragment initialState2; |
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188 | initialState2.SetZandA_asInt(aProjectileZ-chargedFromProjectile, |
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189 | aProjectileA-particlesFromProjectile); |
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190 | initialState2.SetNumberOfHoles(static_cast<G4int>((aProjectileA-particlesFromProjectile)/2.0)); |
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191 | initialState2.SetNumberOfParticles(static_cast<G4int>((aProjectileZ-chargedFromProjectile)/2.0)); |
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192 | initialState2.SetNumberOfCharged(static_cast<G4int>((aProjectileZ-chargedFromProjectile)/2.0)); |
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193 | |
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194 | |
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195 | initialState2.SetMomentum(residual4Momentum); |
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196 | theExcitationResult = theHandler->BreakItUp(initialState2); |
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197 | } |
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198 | |
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199 | // Fill the particle change |
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200 | G4int nSecondaries = 0; |
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201 | if(theExcitationResult) nSecondaries+=theExcitationResult->size(); |
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202 | if(thePreCompoundResult) nSecondaries+=thePreCompoundResult->size(); |
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203 | |
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204 | unsigned int k; |
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205 | if(theExcitationResult!=0) |
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206 | { |
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207 | for(k=0; k<theExcitationResult->size(); k++) |
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208 | { |
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209 | G4DynamicParticle* p0 = new G4DynamicParticle; |
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210 | p0->SetDefinition( theExcitationResult->operator[](k)->GetDefinition() ); |
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211 | p0->SetMomentum( theExcitationResult->operator[](k)->GetMomentum() ); |
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212 | theResult.AddSecondary(p0); |
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213 | } |
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214 | } |
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215 | |
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216 | for(k=0; k<thePreCompoundResult->size(); k++) |
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217 | { |
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218 | G4DynamicParticle* p0 = new G4DynamicParticle; |
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219 | p0->SetDefinition(thePreCompoundResult->operator[](k)->GetDefinition()); |
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220 | p0->SetMomentum(thePreCompoundResult->operator[](k)->GetMomentum()); |
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221 | theResult.AddSecondary(p0); |
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222 | } |
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223 | |
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224 | // clean up |
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225 | std::for_each(thePreCompoundResult->begin(), thePreCompoundResult->end(), DeleteReactionProduct()); |
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226 | if(theExcitationResult) |
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227 | { |
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228 | std::for_each(theExcitationResult->begin(), theExcitationResult->end(), DeleteReactionProduct()); |
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229 | } |
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230 | delete thePreCompoundResult; |
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231 | if(theExcitationResult) delete theExcitationResult; |
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232 | |
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233 | // return the particle change |
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234 | return &theResult; |
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235 | |
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236 | } |
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