1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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9 | // * include a list of copyright holders. * |
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10 | // * * |
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11 | // * Neither the authors of this software system, nor their employing * |
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13 | // * work make any representation or warranty, express or implied, * |
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14 | // * regarding this software system or assume any liability for its * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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16 | // * for the full disclaimer and the limitation of liability. * |
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17 | // * * |
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18 | // * This code implementation is the result of the scientific and * |
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19 | // * technical work of the GEANT4 collaboration. * |
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20 | // * By using, copying, modifying or distributing the software (or * |
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21 | // * any work based on the software) you agree to acknowledge its * |
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22 | // * use in resulting scientific publications, and indicate your * |
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23 | // * acceptance of all terms of the Geant4 Software license. * |
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24 | // ******************************************************************** |
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25 | // |
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26 | // $Id: G4RPGProtonInelastic.cc,v 1.4 2008/05/05 21:21:55 dennis Exp $ |
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27 | // GEANT4 tag $Name: geant4-09-02 $ |
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28 | // |
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29 | |
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30 | #include "G4RPGProtonInelastic.hh" |
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31 | #include "Randomize.hh" |
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32 | |
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33 | G4HadFinalState* |
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34 | G4RPGProtonInelastic::ApplyYourself(const G4HadProjectile& aTrack, |
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35 | G4Nucleus& targetNucleus ) |
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36 | { |
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37 | theParticleChange.Clear(); |
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38 | const G4HadProjectile *originalIncident = &aTrack; |
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39 | if (originalIncident->GetKineticEnergy()<= 0.1) |
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40 | { |
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41 | theParticleChange.SetStatusChange(isAlive); |
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42 | theParticleChange.SetEnergyChange(aTrack.GetKineticEnergy()); |
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43 | theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit()); |
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44 | return &theParticleChange; |
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45 | } |
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46 | |
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47 | // |
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48 | // create the target particle |
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49 | // |
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50 | G4DynamicParticle *originalTarget = targetNucleus.ReturnTargetParticle(); |
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51 | |
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52 | if (originalIncident->GetKineticEnergy()/GeV < 0.01+2.*G4UniformRand()/9. ) |
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53 | { |
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54 | SlowProton( originalIncident, targetNucleus ); |
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55 | delete originalTarget; |
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56 | return &theParticleChange; |
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57 | } |
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58 | |
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59 | // Fermi motion and evaporation |
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60 | // As of Geant3, the Fermi energy calculation had not been Done |
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61 | |
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62 | G4double ek = originalIncident->GetKineticEnergy(); |
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63 | G4double amas = originalIncident->GetDefinition()->GetPDGMass(); |
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64 | G4ReactionProduct modifiedOriginal; |
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65 | modifiedOriginal = *originalIncident; |
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66 | |
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67 | G4double tkin = targetNucleus.Cinema( ek ); |
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68 | ek += tkin; |
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69 | modifiedOriginal.SetKineticEnergy(ek); |
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70 | G4double et = ek + amas; |
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71 | G4double p = std::sqrt( std::abs((et-amas)*(et+amas)) ); |
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72 | G4double pp = modifiedOriginal.GetMomentum().mag(); |
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73 | if (pp > 0.0) { |
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74 | G4ThreeVector momentum = modifiedOriginal.GetMomentum(); |
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75 | modifiedOriginal.SetMomentum( momentum * (p/pp) ); |
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76 | } |
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77 | // |
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78 | // calculate black track energies |
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79 | // |
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80 | tkin = targetNucleus.EvaporationEffects(ek); |
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81 | ek -= tkin; |
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82 | modifiedOriginal.SetKineticEnergy(ek); |
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83 | et = ek + amas; |
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84 | p = std::sqrt( std::abs((et-amas)*(et+amas)) ); |
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85 | pp = modifiedOriginal.GetMomentum().mag(); |
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86 | if (pp > 0.0) { |
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87 | G4ThreeVector momentum = modifiedOriginal.GetMomentum(); |
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88 | modifiedOriginal.SetMomentum( momentum * (p/pp) ); |
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89 | } |
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90 | const G4double cutOff = 0.1; |
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91 | if (modifiedOriginal.GetKineticEnergy() < cutOff) { |
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92 | SlowProton( originalIncident, targetNucleus ); |
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93 | delete originalTarget; |
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94 | return &theParticleChange; |
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95 | } |
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96 | |
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97 | G4ReactionProduct currentParticle = modifiedOriginal; |
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98 | G4ReactionProduct targetParticle; |
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99 | targetParticle = *originalTarget; |
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100 | currentParticle.SetSide( 1 ); // incident always goes in forward hemisphere |
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101 | targetParticle.SetSide( -1 ); // target always goes in backward hemisphere |
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102 | G4bool incidentHasChanged = false; |
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103 | G4bool targetHasChanged = false; |
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104 | G4bool quasiElastic = false; |
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105 | G4FastVector<G4ReactionProduct,256> vec; // vec will contain the sec. particles |
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106 | G4int vecLen = 0; |
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107 | vec.Initialize( 0 ); |
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108 | |
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109 | InitialCollision(vec, vecLen, currentParticle, targetParticle, |
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110 | incidentHasChanged, targetHasChanged); |
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111 | |
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112 | CalculateMomenta(vec, vecLen, |
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113 | originalIncident, originalTarget, modifiedOriginal, |
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114 | targetNucleus, currentParticle, targetParticle, |
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115 | incidentHasChanged, targetHasChanged, quasiElastic); |
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116 | |
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117 | SetUpChange( vec, vecLen, |
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118 | currentParticle, targetParticle, |
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119 | incidentHasChanged ); |
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120 | |
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121 | delete originalTarget; |
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122 | return &theParticleChange; |
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123 | } |
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124 | |
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125 | |
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126 | void |
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127 | G4RPGProtonInelastic::SlowProton(const G4HadProjectile *originalIncident, |
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128 | G4Nucleus &targetNucleus ) |
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129 | { |
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130 | const G4double A = targetNucleus.GetN(); // atomic weight |
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131 | const G4double Z = targetNucleus.GetZ(); // atomic number |
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132 | // G4double currentKinetic = originalIncident->GetKineticEnergy(); |
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133 | // |
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134 | // calculate Q-value of reactions |
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135 | // |
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136 | G4double theAtomicMass = targetNucleus.AtomicMass( A, Z ); |
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137 | G4double massVec[9]; |
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138 | massVec[0] = targetNucleus.AtomicMass( A+1.0, Z+1.0 ); |
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139 | massVec[1] = 0.; |
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140 | if (A > Z+1.0) |
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141 | massVec[1] = targetNucleus.AtomicMass( A , Z+1.0 ); |
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142 | massVec[2] = theAtomicMass; |
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143 | massVec[3] = 0.; |
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144 | if (A > 1.0 && A-1.0 > Z) |
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145 | massVec[3] = targetNucleus.AtomicMass( A-1.0, Z ); |
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146 | massVec[4] = 0.; |
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147 | if (A > 2.0 && A-2.0 > Z) |
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148 | massVec[4] = targetNucleus.AtomicMass( A-2.0, Z ); |
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149 | massVec[5] = 0.; |
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150 | if (A > 3.0 && Z > 1.0 && A-3.0 > Z-1.0) |
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151 | massVec[5] = targetNucleus.AtomicMass( A-3.0, Z-1.0 ); |
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152 | massVec[6] = 0.; |
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153 | if (A > 1.0 && A-1.0 > Z+1.0) |
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154 | massVec[6] = targetNucleus.AtomicMass( A-1.0, Z+1.0 ); |
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155 | massVec[7] = massVec[3]; |
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156 | massVec[8] = 0.; |
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157 | if (A > 1.0 && Z > 1.0) |
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158 | massVec[8] = targetNucleus.AtomicMass( A-1.0, Z-1.0 ); |
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159 | |
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160 | G4FastVector<G4ReactionProduct,4> vec; // vec will contain the secondary particles |
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161 | G4int vecLen = 0; |
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162 | vec.Initialize( 0 ); |
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163 | |
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164 | twoBody.NuclearReaction( vec, vecLen, originalIncident, |
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165 | targetNucleus, theAtomicMass, massVec ); |
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166 | |
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167 | theParticleChange.SetStatusChange( stopAndKill ); |
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168 | theParticleChange.SetEnergyChange( 0.0 ); |
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169 | |
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170 | G4DynamicParticle *pd; |
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171 | for( G4int i=0; i<vecLen; ++i ) |
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172 | { |
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173 | pd = new G4DynamicParticle(); |
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174 | pd->SetDefinition( vec[i]->GetDefinition() ); |
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175 | pd->SetMomentum( vec[i]->GetMomentum() ); |
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176 | theParticleChange.AddSecondary( pd ); |
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177 | delete vec[i]; |
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178 | } |
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179 | } |
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180 | |
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181 | |
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182 | // Initial Collision |
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183 | // selects the particle types arising from the initial collision of |
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184 | // the proton and target nucleon. Secondaries are assigned to forward |
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185 | // and backward reaction hemispheres, but final state energies and |
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186 | // momenta are not calculated here. |
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187 | |
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188 | void |
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189 | G4RPGProtonInelastic::InitialCollision(G4FastVector<G4ReactionProduct,256>& vec, |
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190 | G4int& vecLen, |
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191 | G4ReactionProduct& currentParticle, |
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192 | G4ReactionProduct& targetParticle, |
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193 | G4bool& incidentHasChanged, |
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194 | G4bool& targetHasChanged) |
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195 | { |
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196 | G4double KE = currentParticle.GetKineticEnergy()/GeV; |
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197 | |
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198 | G4int mult; |
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199 | G4int partType; |
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200 | std::vector<G4int> fsTypes; |
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201 | G4int part1; |
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202 | G4int part2; |
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203 | |
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204 | G4double testCharge; |
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205 | G4double testBaryon; |
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206 | G4double testStrange; |
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207 | |
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208 | // Get particle types according to incident and target types |
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209 | |
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210 | if (targetParticle.GetDefinition() == particleDef[pro]) { |
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211 | mult = GetMultiplicityT1(KE); |
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212 | fsTypes = GetFSPartTypesForPP(mult, KE); |
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213 | |
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214 | part1 = fsTypes[0]; |
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215 | part2 = fsTypes[1]; |
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216 | currentParticle.SetDefinition(particleDef[part1]); |
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217 | targetParticle.SetDefinition(particleDef[part2]); |
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218 | if (part1 == pro) { |
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219 | if (part2 == neu) { |
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220 | if (G4UniformRand() > 0.5) { |
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221 | incidentHasChanged = true; |
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222 | targetParticle.SetDefinition(particleDef[part1]); |
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223 | currentParticle.SetDefinition(particleDef[part2]); |
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224 | } else { |
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225 | targetHasChanged = true; |
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226 | } |
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227 | } else if (part2 > neu && part2 < xi0) { |
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228 | targetHasChanged = true; |
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229 | } |
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230 | |
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231 | } else { // neutron |
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232 | targetHasChanged = true; |
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233 | incidentHasChanged = true; |
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234 | } |
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235 | |
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236 | testCharge = 2.0; |
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237 | testBaryon = 2.0; |
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238 | testStrange = 0.0; |
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239 | |
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240 | } else { // target was a neutron |
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241 | mult = GetMultiplicityT0(KE); |
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242 | fsTypes = GetFSPartTypesForPN(mult, KE); |
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243 | |
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244 | part1 = fsTypes[0]; |
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245 | part2 = fsTypes[1]; |
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246 | currentParticle.SetDefinition(particleDef[part1]); |
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247 | targetParticle.SetDefinition(particleDef[part2]); |
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248 | if (part1 == pro) { |
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249 | if (part2 == pro) { |
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250 | targetHasChanged = true; |
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251 | } else if (part2 == neu) { |
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252 | if (G4UniformRand() > 0.5) { |
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253 | incidentHasChanged = true; |
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254 | targetHasChanged = true; |
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255 | targetParticle.SetDefinition(particleDef[part1]); |
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256 | currentParticle.SetDefinition(particleDef[part2]); |
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257 | } |
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258 | } else { // hyperon |
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259 | targetHasChanged = true; |
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260 | } |
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261 | |
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262 | } else { // neutron |
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263 | incidentHasChanged = true; |
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264 | if (part2 > neu && part2 < xi0) targetHasChanged = true; |
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265 | } |
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266 | |
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267 | testCharge = 1.0; |
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268 | testBaryon = 2.0; |
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269 | testStrange = 0.0; |
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270 | } |
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271 | |
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272 | // Remove incident and target from fsTypes |
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273 | |
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274 | fsTypes.erase(fsTypes.begin()); |
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275 | fsTypes.erase(fsTypes.begin()); |
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276 | |
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277 | // Remaining particles are secondaries. Put them into vec. |
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278 | |
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279 | G4ReactionProduct* rp(0); |
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280 | for(G4int i=0; i < mult-2; ++i ) { |
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281 | partType = fsTypes[i]; |
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282 | rp = new G4ReactionProduct(); |
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283 | rp->SetDefinition(particleDef[partType]); |
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284 | (G4UniformRand() < 0.5) ? rp->SetSide(-1) : rp->SetSide(1); |
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285 | vec.SetElement(vecLen++, rp); |
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286 | } |
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287 | |
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288 | // Check conservation of charge, strangeness, baryon number |
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289 | |
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290 | CheckQnums(vec, vecLen, currentParticle, targetParticle, |
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291 | testCharge, testBaryon, testStrange); |
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292 | |
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293 | return; |
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294 | } |
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