1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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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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12 | // * institutes,nor the agencies providing financial support for this * |
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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 | // |
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27 | // $Id: G4HEAntiLambdaInelastic.cc,v 1.17 2010/11/27 02:00:07 dennis Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-04-ref-00 $ |
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29 | // |
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30 | |
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31 | #include "globals.hh" |
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32 | #include "G4ios.hh" |
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33 | |
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34 | // G4 Process: Gheisha High Energy Collision model. |
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35 | // This includes the high energy cascading model, the two-body-resonance model |
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36 | // and the low energy two-body model. Not included are the low energy stuff |
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37 | // like nuclear reactions, nuclear fission without any cascading and all |
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38 | // processes for particles at rest. |
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39 | // First work done by J.L.Chuma and F.W.Jones, TRIUMF, June 96. |
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40 | // H. Fesefeldt, RWTH-Aachen, 23-October-1996 |
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41 | // Last modified: 29-July-1998 |
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42 | |
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43 | #include "G4HEAntiLambdaInelastic.hh" |
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44 | |
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45 | |
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46 | G4HadFinalState* |
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47 | G4HEAntiLambdaInelastic::ApplyYourself(const G4HadProjectile &aTrack, |
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48 | G4Nucleus &targetNucleus) |
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49 | { |
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50 | G4HEVector * pv = new G4HEVector[MAXPART]; |
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51 | const G4HadProjectile *aParticle = &aTrack; |
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52 | const G4double atomicWeight = targetNucleus.GetN(); |
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53 | const G4double atomicNumber = targetNucleus.GetZ(); |
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54 | G4HEVector incidentParticle(aParticle); |
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55 | |
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56 | G4int incidentCode = incidentParticle.getCode(); |
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57 | G4double incidentMass = incidentParticle.getMass(); |
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58 | G4double incidentTotalEnergy = incidentParticle.getEnergy(); |
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59 | G4double incidentTotalMomentum = incidentParticle.getTotalMomentum(); |
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60 | G4double incidentKineticEnergy = incidentTotalEnergy - incidentMass; |
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61 | |
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62 | if (incidentKineticEnergy < 1.) |
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63 | G4cout << "GHEAntiLambdaInelastic: incident energy < 1 GeV" << G4endl; |
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64 | |
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65 | if (verboseLevel > 1) { |
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66 | G4cout << "G4HEAntiLambdaInelastic::ApplyYourself" << G4endl; |
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67 | G4cout << "incident particle " << incidentParticle.getName() |
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68 | << "mass " << incidentMass |
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69 | << "kinetic energy " << incidentKineticEnergy |
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70 | << G4endl; |
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71 | G4cout << "target material with (A,Z) = (" |
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72 | << atomicWeight << "," << atomicNumber << ")" << G4endl; |
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73 | } |
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74 | |
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75 | G4double inelasticity = NuclearInelasticity(incidentKineticEnergy, |
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76 | atomicWeight, atomicNumber); |
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77 | if (verboseLevel > 1) |
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78 | G4cout << "nuclear inelasticity = " << inelasticity << G4endl; |
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79 | |
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80 | incidentKineticEnergy -= inelasticity; |
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81 | |
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82 | G4double excitationEnergyGNP = 0.; |
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83 | G4double excitationEnergyDTA = 0.; |
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84 | |
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85 | G4double excitation = NuclearExcitation(incidentKineticEnergy, |
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86 | atomicWeight, atomicNumber, |
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87 | excitationEnergyGNP, |
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88 | excitationEnergyDTA); |
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89 | if (verboseLevel > 1) |
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90 | G4cout << "nuclear excitation = " << excitation << excitationEnergyGNP |
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91 | << excitationEnergyDTA << G4endl; |
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92 | |
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93 | incidentKineticEnergy -= excitation; |
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94 | incidentTotalEnergy = incidentKineticEnergy + incidentMass; |
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95 | incidentTotalMomentum = std::sqrt( (incidentTotalEnergy-incidentMass) |
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96 | *(incidentTotalEnergy+incidentMass)); |
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97 | |
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98 | G4HEVector targetParticle; |
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99 | if (G4UniformRand() < atomicNumber/atomicWeight) { |
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100 | targetParticle.setDefinition("Proton"); |
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101 | } else { |
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102 | targetParticle.setDefinition("Neutron"); |
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103 | } |
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104 | |
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105 | G4double targetMass = targetParticle.getMass(); |
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106 | G4double centerOfMassEnergy = |
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107 | std::sqrt( incidentMass*incidentMass + targetMass*targetMass |
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108 | + 2.0*targetMass*incidentTotalEnergy); |
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109 | G4double availableEnergy = centerOfMassEnergy - targetMass - incidentMass; |
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110 | |
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111 | G4bool inElastic = true; |
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112 | vecLength = 0; |
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113 | |
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114 | if (verboseLevel > 1) |
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115 | G4cout << "ApplyYourself: CallFirstIntInCascade for particle " |
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116 | << incidentCode << G4endl; |
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117 | |
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118 | G4bool successful = false; |
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119 | |
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120 | FirstIntInCasAntiLambda(inElastic, availableEnergy, pv, vecLength, |
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121 | incidentParticle, targetParticle, atomicWeight); |
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122 | |
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123 | if (verboseLevel > 1) |
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124 | G4cout << "ApplyYourself::StrangeParticlePairProduction" << G4endl; |
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125 | |
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126 | if ((vecLength > 0) && (availableEnergy > 1.)) |
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127 | StrangeParticlePairProduction(availableEnergy, centerOfMassEnergy, |
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128 | pv, vecLength, |
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129 | incidentParticle, targetParticle); |
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130 | HighEnergyCascading(successful, pv, vecLength, |
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131 | excitationEnergyGNP, excitationEnergyDTA, |
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132 | incidentParticle, targetParticle, |
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133 | atomicWeight, atomicNumber); |
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134 | if (!successful) |
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135 | HighEnergyClusterProduction(successful, pv, vecLength, |
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136 | excitationEnergyGNP, excitationEnergyDTA, |
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137 | incidentParticle, targetParticle, |
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138 | atomicWeight, atomicNumber); |
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139 | if (!successful) |
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140 | MediumEnergyCascading(successful, pv, vecLength, |
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141 | excitationEnergyGNP, excitationEnergyDTA, |
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142 | incidentParticle, targetParticle, |
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143 | atomicWeight, atomicNumber); |
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144 | |
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145 | if (!successful) |
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146 | MediumEnergyClusterProduction(successful, pv, vecLength, |
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147 | excitationEnergyGNP, excitationEnergyDTA, |
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148 | incidentParticle, targetParticle, |
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149 | atomicWeight, atomicNumber); |
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150 | if (!successful) |
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151 | QuasiElasticScattering(successful, pv, vecLength, |
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152 | excitationEnergyGNP, excitationEnergyDTA, |
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153 | incidentParticle, targetParticle, |
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154 | atomicWeight, atomicNumber); |
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155 | if (!successful) |
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156 | ElasticScattering(successful, pv, vecLength, |
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157 | incidentParticle, |
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158 | atomicWeight, atomicNumber); |
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159 | |
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160 | if (!successful) |
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161 | G4cout << "GHEInelasticInteraction::ApplyYourself fails to produce final state particles" |
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162 | << G4endl; |
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163 | |
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164 | FillParticleChange(pv, vecLength); |
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165 | delete [] pv; |
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166 | theParticleChange.SetStatusChange(stopAndKill); |
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167 | return & theParticleChange; |
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168 | } |
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169 | |
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170 | |
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171 | void |
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172 | G4HEAntiLambdaInelastic::FirstIntInCasAntiLambda(G4bool& inElastic, |
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173 | const G4double availableEnergy, |
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174 | G4HEVector pv[], |
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175 | G4int &vecLen, |
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176 | const G4HEVector& incidentParticle, |
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177 | const G4HEVector& targetParticle, |
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178 | const G4double atomicWeight) |
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179 | |
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180 | // AntiLambda undergoes interaction with nucleon within a nucleus. |
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181 | // Check if it is energetically possible to produce pions/kaons. If not, |
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182 | // assume nuclear excitation occurs and input particle is degraded in |
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183 | // energy. No other particles are produced. |
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184 | // If reaction is possible, find the correct number of pions/protons/neutrons |
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185 | // produced using an interpolation to multiplicity data. Replace some pions or |
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186 | // protons/neutrons by kaons or strange baryons according to the average |
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187 | // multiplicity per inelastic reaction. |
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188 | { |
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189 | static const G4double expxu = std::log(MAXFLOAT); // upper bound for arg. of exp |
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190 | static const G4double expxl = -expxu; // lower bound for arg. of exp |
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191 | |
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192 | static const G4double protb = 0.7; |
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193 | static const G4double neutb = 0.7; |
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194 | static const G4double c = 1.25; |
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195 | |
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196 | static const G4int numMul = 1200; |
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197 | static const G4int numMulAn = 400; |
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198 | static const G4int numSec = 60; |
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199 | |
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200 | G4int protonCode = Proton.getCode(); |
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201 | |
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202 | G4int targetCode = targetParticle.getCode(); |
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203 | G4double incidentTotalMomentum = incidentParticle.getTotalMomentum(); |
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204 | |
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205 | static G4bool first = true; |
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206 | static G4double protmul[numMul], protnorm[numSec]; // proton constants |
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207 | static G4double protmulAn[numMulAn],protnormAn[numSec]; |
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208 | static G4double neutmul[numMul], neutnorm[numSec]; // neutron constants |
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209 | static G4double neutmulAn[numMulAn],neutnormAn[numSec]; |
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210 | |
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211 | // misc. local variables |
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212 | // np = number of pi+, nm = number of pi-, nz = number of pi0 |
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213 | |
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214 | G4int i, counter, nt, np, nm, nz; |
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215 | |
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216 | if( first ) |
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217 | { // compute normalization constants, this will only be done once |
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218 | first = false; |
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219 | for( i=0; i<numMul ; i++ ) protmul[i] = 0.0; |
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220 | for( i=0; i<numSec ; i++ ) protnorm[i] = 0.0; |
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221 | counter = -1; |
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222 | for( np=0; np<(numSec/3); np++ ) |
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223 | { |
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224 | for( nm=std::max(0,np-2); nm<=(np+1); nm++ ) |
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225 | { |
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226 | for( nz=0; nz<numSec/3; nz++ ) |
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227 | { |
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228 | if( ++counter < numMul ) |
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229 | { |
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230 | nt = np+nm+nz; |
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231 | if( (nt>0) && (nt<=numSec) ) |
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232 | { |
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233 | protmul[counter] = pmltpc(np,nm,nz,nt,protb,c); |
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234 | protnorm[nt-1] += protmul[counter]; |
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235 | } |
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236 | } |
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237 | } |
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238 | } |
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239 | } |
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240 | for( i=0; i<numMul; i++ )neutmul[i] = 0.0; |
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241 | for( i=0; i<numSec; i++ )neutnorm[i] = 0.0; |
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242 | counter = -1; |
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243 | for( np=0; np<numSec/3; np++ ) |
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244 | { |
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245 | for( nm=std::max(0,np-1); nm<=(np+2); nm++ ) |
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246 | { |
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247 | for( nz=0; nz<numSec/3; nz++ ) |
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248 | { |
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249 | if( ++counter < numMul ) |
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250 | { |
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251 | nt = np+nm+nz; |
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252 | if( (nt>0) && (nt<=numSec) ) |
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253 | { |
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254 | neutmul[counter] = pmltpc(np,nm,nz,nt,neutb,c); |
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255 | neutnorm[nt-1] += neutmul[counter]; |
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256 | } |
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257 | } |
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258 | } |
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259 | } |
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260 | } |
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261 | for( i=0; i<numSec; i++ ) |
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262 | { |
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263 | if( protnorm[i] > 0.0 )protnorm[i] = 1.0/protnorm[i]; |
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264 | if( neutnorm[i] > 0.0 )neutnorm[i] = 1.0/neutnorm[i]; |
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265 | } |
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266 | // annihilation |
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267 | for( i=0; i<numMulAn ; i++ ) protmulAn[i] = 0.0; |
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268 | for( i=0; i<numSec ; i++ ) protnormAn[i] = 0.0; |
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269 | counter = -1; |
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270 | for( np=1; np<(numSec/3); np++ ) |
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271 | { |
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272 | nm = std::max(0,np-1); |
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273 | for( nz=0; nz<numSec/3; nz++ ) |
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274 | { |
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275 | if( ++counter < numMulAn ) |
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276 | { |
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277 | nt = np+nm+nz; |
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278 | if( (nt>1) && (nt<=numSec) ) |
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279 | { |
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280 | protmulAn[counter] = pmltpc(np,nm,nz,nt,protb,c); |
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281 | protnormAn[nt-1] += protmulAn[counter]; |
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282 | } |
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283 | } |
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284 | } |
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285 | } |
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286 | for( i=0; i<numMulAn; i++ ) neutmulAn[i] = 0.0; |
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287 | for( i=0; i<numSec; i++ ) neutnormAn[i] = 0.0; |
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288 | counter = -1; |
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289 | for( np=0; np<numSec/3; np++ ) |
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290 | { |
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291 | nm = np; |
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292 | for( nz=0; nz<numSec/3; nz++ ) |
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293 | { |
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294 | if( ++counter < numMulAn ) |
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295 | { |
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296 | nt = np+nm+nz; |
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297 | if( (nt>1) && (nt<=numSec) ) |
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298 | { |
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299 | neutmulAn[counter] = pmltpc(np,nm,nz,nt,neutb,c); |
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300 | neutnormAn[nt-1] += neutmulAn[counter]; |
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301 | } |
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302 | } |
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303 | } |
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304 | } |
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305 | for( i=0; i<numSec; i++ ) |
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306 | { |
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307 | if( protnormAn[i] > 0.0 )protnormAn[i] = 1.0/protnormAn[i]; |
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308 | if( neutnormAn[i] > 0.0 )neutnormAn[i] = 1.0/neutnormAn[i]; |
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309 | } |
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310 | } // end of initialization |
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311 | |
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312 | |
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313 | // initialize the first two places |
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314 | // the same as beam and target |
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315 | pv[0] = incidentParticle; |
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316 | pv[1] = targetParticle; |
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317 | vecLen = 2; |
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318 | |
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319 | if( !inElastic ) |
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320 | { // some two-body reactions |
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321 | G4double cech[] = {0.50, 0.45, 0.40, 0.35, 0.30, 0.25, 0.06, 0.04, 0.005, 0.}; |
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322 | |
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323 | G4int iplab = std::min(9, G4int( incidentTotalMomentum*2.5)); |
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324 | if( G4UniformRand() < cech[iplab]/std::pow(atomicWeight,0.42) ) |
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325 | { |
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326 | G4double ran = G4UniformRand(); |
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327 | |
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328 | if ( targetCode == protonCode) |
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329 | { |
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330 | if(ran < 0.2) |
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331 | { |
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332 | pv[0] = AntiSigmaZero; |
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333 | } |
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334 | else if (ran < 0.4) |
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335 | { |
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336 | pv[0] = AntiSigmaMinus; |
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337 | pv[1] = Neutron; |
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338 | } |
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339 | else if (ran < 0.6) |
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340 | { |
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341 | pv[0] = Proton; |
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342 | pv[1] = AntiLambda; |
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343 | } |
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344 | else if (ran < 0.8) |
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345 | { |
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346 | pv[0] = Proton; |
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347 | pv[1] = AntiSigmaZero; |
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348 | } |
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349 | else |
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350 | { |
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351 | pv[0] = Neutron; |
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352 | pv[1] = AntiSigmaMinus; |
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353 | } |
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354 | } |
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355 | else |
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356 | { |
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357 | if (ran < 0.2) |
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358 | { |
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359 | pv[0] = AntiSigmaZero; |
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360 | } |
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361 | else if (ran < 0.4) |
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362 | { |
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363 | pv[0] = AntiSigmaPlus; |
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364 | pv[1] = Proton; |
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365 | } |
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366 | else if (ran < 0.6) |
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367 | { |
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368 | pv[0] = Neutron; |
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369 | pv[1] = AntiLambda; |
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370 | } |
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371 | else if (ran < 0.8) |
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372 | { |
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373 | pv[0] = Neutron; |
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374 | pv[1] = AntiSigmaZero; |
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375 | } |
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376 | else |
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377 | { |
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378 | pv[0] = Proton; |
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379 | pv[1] = AntiSigmaPlus; |
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380 | } |
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381 | } |
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382 | } |
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383 | return; |
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384 | } |
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385 | else if (availableEnergy <= PionPlus.getMass()) |
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386 | return; |
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387 | |
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388 | // inelastic scattering |
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389 | |
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390 | np = 0; nm = 0; nz = 0; |
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391 | G4double anhl[] = {1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 0.97, 0.88, |
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392 | 0.85, 0.81, 0.75, 0.64, 0.64, 0.55, 0.55, 0.45, 0.47, 0.40, |
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393 | 0.39, 0.36, 0.33, 0.10, 0.01}; |
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394 | G4int iplab = G4int( incidentTotalMomentum*10.); |
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395 | if ( iplab > 9) iplab = 10 + G4int( (incidentTotalMomentum -1.)*5. ); |
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396 | if ( iplab > 14) iplab = 15 + G4int( incidentTotalMomentum -2. ); |
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397 | if ( iplab > 22) iplab = 23 + G4int( (incidentTotalMomentum -10.)/10.); |
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398 | iplab = std::min(24, iplab); |
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399 | |
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400 | if ( G4UniformRand() > anhl[iplab] ) |
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401 | { // non- annihilation channels |
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402 | |
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403 | // number of total particles vs. centre of mass Energy - 2*proton mass |
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404 | |
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405 | G4double aleab = std::log(availableEnergy); |
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406 | G4double n = 3.62567+aleab*(0.665843+aleab*(0.336514 |
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407 | + aleab*(0.117712+0.0136912*aleab))) - 2.0; |
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408 | |
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409 | // normalization constant for kno-distribution. |
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410 | // calculate first the sum of all constants, check for numerical problems. |
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411 | G4double test, dum, anpn = 0.0; |
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412 | |
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413 | for (nt=1; nt<=numSec; nt++) { |
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414 | test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) ); |
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415 | dum = pi*nt/(2.0*n*n); |
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416 | if (std::fabs(dum) < 1.0) { |
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417 | if( test >= 1.0e-10 )anpn += dum*test; |
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418 | } else { |
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419 | anpn += dum*test; |
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420 | } |
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421 | } |
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422 | |
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423 | G4double ran = G4UniformRand(); |
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424 | G4double excs = 0.0; |
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425 | if( targetCode == protonCode ) |
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426 | { |
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427 | counter = -1; |
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428 | for( np=0; np<numSec/3; np++ ) |
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429 | { |
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430 | for( nm=std::max(0,np-2); nm<=(np+1); nm++ ) |
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431 | { |
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432 | for( nz=0; nz<numSec/3; nz++ ) |
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433 | { |
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434 | if( ++counter < numMul ) |
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435 | { |
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436 | nt = np+nm+nz; |
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437 | if( (nt>0) && (nt<=numSec) ) |
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438 | { |
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439 | test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) ); |
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440 | dum = (pi/anpn)*nt*protmul[counter]*protnorm[nt-1]/(2.0*n*n); |
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441 | |
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442 | if (std::fabs(dum) < 1.0) { |
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443 | if( test >= 1.0e-10 )excs += dum*test; |
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444 | } else { |
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445 | excs += dum*test; |
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446 | } |
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447 | |
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448 | if (ran < excs) goto outOfLoop; //-----------------------> |
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449 | } |
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450 | } |
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451 | } |
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452 | } |
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453 | } |
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454 | |
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455 | // 3 previous loops continued to the end |
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456 | inElastic = false; // quasi-elastic scattering |
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457 | return; |
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458 | } |
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459 | else |
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460 | { // target must be a neutron |
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461 | counter = -1; |
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462 | for( np=0; np<numSec/3; np++ ) |
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463 | { |
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464 | for( nm=std::max(0,np-1); nm<=(np+2); nm++ ) |
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465 | { |
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466 | for( nz=0; nz<numSec/3; nz++ ) |
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467 | { |
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468 | if( ++counter < numMul ) |
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469 | { |
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470 | nt = np+nm+nz; |
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471 | if( (nt>0) && (nt<=numSec) ) |
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472 | { |
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473 | test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) ); |
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474 | dum = (pi/anpn)*nt*neutmul[counter]*neutnorm[nt-1]/(2.0*n*n); |
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475 | if (std::fabs(dum) < 1.0) { |
---|
476 | if( test >= 1.0e-10 )excs += dum*test; |
---|
477 | } else { |
---|
478 | excs += dum*test; |
---|
479 | } |
---|
480 | |
---|
481 | if (ran < excs) goto outOfLoop; // --------------------------> |
---|
482 | } |
---|
483 | } |
---|
484 | } |
---|
485 | } |
---|
486 | } |
---|
487 | // 3 previous loops continued to the end |
---|
488 | inElastic = false; // quasi-elastic scattering. |
---|
489 | return; |
---|
490 | } |
---|
491 | |
---|
492 | outOfLoop: // <------------------------------------------------------------------------ |
---|
493 | |
---|
494 | ran = G4UniformRand(); |
---|
495 | |
---|
496 | if( targetCode == protonCode) |
---|
497 | { |
---|
498 | if( np == nm) |
---|
499 | { |
---|
500 | if (ran < 0.40) |
---|
501 | { |
---|
502 | } |
---|
503 | else if (ran < 0.8) |
---|
504 | { |
---|
505 | pv[0] = AntiSigmaZero; |
---|
506 | } |
---|
507 | else |
---|
508 | { |
---|
509 | pv[0] = AntiSigmaMinus; |
---|
510 | pv[1] = Neutron; |
---|
511 | } |
---|
512 | } |
---|
513 | else if (np == (nm+1)) |
---|
514 | { |
---|
515 | if( ran < 0.25) |
---|
516 | { |
---|
517 | pv[1] = Neutron; |
---|
518 | } |
---|
519 | else if (ran < 0.5) |
---|
520 | { |
---|
521 | pv[0] = AntiSigmaZero; |
---|
522 | pv[1] = Neutron; |
---|
523 | } |
---|
524 | else |
---|
525 | { |
---|
526 | pv[0] = AntiSigmaPlus; |
---|
527 | } |
---|
528 | } |
---|
529 | else if (np == (nm-1)) |
---|
530 | { |
---|
531 | pv[0] = AntiSigmaMinus; |
---|
532 | } |
---|
533 | else |
---|
534 | { |
---|
535 | pv[0] = AntiSigmaPlus; |
---|
536 | pv[1] = Neutron; |
---|
537 | } |
---|
538 | } |
---|
539 | else |
---|
540 | { |
---|
541 | if( np == nm) |
---|
542 | { |
---|
543 | if (ran < 0.4) |
---|
544 | { |
---|
545 | } |
---|
546 | else if(ran < 0.8) |
---|
547 | { |
---|
548 | pv[0] = AntiSigmaZero; |
---|
549 | } |
---|
550 | else |
---|
551 | { |
---|
552 | pv[0] = AntiSigmaPlus; |
---|
553 | pv[1] = Proton; |
---|
554 | } |
---|
555 | } |
---|
556 | else if ( np == (nm-1)) |
---|
557 | { |
---|
558 | if (ran < 0.5) |
---|
559 | { |
---|
560 | pv[0] = AntiSigmaMinus; |
---|
561 | } |
---|
562 | else if (ran < 0.75) |
---|
563 | { |
---|
564 | pv[1] = Proton; |
---|
565 | } |
---|
566 | else |
---|
567 | { |
---|
568 | pv[0] = AntiSigmaZero; |
---|
569 | pv[1] = Proton; |
---|
570 | } |
---|
571 | } |
---|
572 | else if (np == (nm+1)) |
---|
573 | { |
---|
574 | pv[0] = AntiSigmaPlus; |
---|
575 | } |
---|
576 | else |
---|
577 | { |
---|
578 | pv[0] = AntiSigmaMinus; |
---|
579 | pv[1] = Proton; |
---|
580 | } |
---|
581 | } |
---|
582 | |
---|
583 | } |
---|
584 | else // annihilation |
---|
585 | { |
---|
586 | if ( availableEnergy > 2. * PionPlus.getMass() ) |
---|
587 | { |
---|
588 | |
---|
589 | G4double aleab = std::log(availableEnergy); |
---|
590 | G4double n = 3.62567+aleab*(0.665843+aleab*(0.336514 |
---|
591 | + aleab*(0.117712+0.0136912*aleab))) - 2.0; |
---|
592 | |
---|
593 | // normalization constant for kno-distribution. |
---|
594 | // calculate first the sum of all constants, check for numerical problems. |
---|
595 | G4double test, dum, anpn = 0.0; |
---|
596 | |
---|
597 | for (nt=2; nt<=numSec; nt++) { |
---|
598 | test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) ); |
---|
599 | dum = pi*nt/(2.0*n*n); |
---|
600 | |
---|
601 | if (std::fabs(dum) < 1.0) { |
---|
602 | if( test >= 1.0e-10 )anpn += dum*test; |
---|
603 | } else { |
---|
604 | anpn += dum*test; |
---|
605 | } |
---|
606 | } |
---|
607 | |
---|
608 | G4double ran = G4UniformRand(); |
---|
609 | G4double excs = 0.0; |
---|
610 | if (targetCode == protonCode) { |
---|
611 | counter = -1; |
---|
612 | for (np=1; np<numSec/3; np++) { |
---|
613 | nm = np-1; |
---|
614 | for( nz=0; nz<numSec/3; nz++ ) |
---|
615 | { |
---|
616 | if( ++counter < numMulAn ) |
---|
617 | { |
---|
618 | nt = np+nm+nz; |
---|
619 | if( (nt>1) && (nt<=numSec) ) { |
---|
620 | test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) ); |
---|
621 | dum = (pi/anpn)*nt*protmulAn[counter]*protnormAn[nt-1]/(2.0*n*n); |
---|
622 | |
---|
623 | if (std::fabs(dum) < 1.0) { |
---|
624 | if( test >= 1.0e-10 )excs += dum*test; |
---|
625 | } else { |
---|
626 | excs += dum*test; |
---|
627 | } |
---|
628 | |
---|
629 | if (ran < excs) goto outOfLoopAn; //-----------------------> |
---|
630 | } |
---|
631 | } |
---|
632 | } |
---|
633 | } |
---|
634 | // 3 previous loops continued to the end |
---|
635 | inElastic = false; // quasi-elastic scattering |
---|
636 | return; |
---|
637 | |
---|
638 | } else { // target must be a neutron |
---|
639 | counter = -1; |
---|
640 | for (np=0; np<numSec/3; np++) { |
---|
641 | nm = np; |
---|
642 | for( nz=0; nz<numSec/3; nz++ ) { |
---|
643 | if (++counter < numMulAn) { |
---|
644 | nt = np+nm+nz; |
---|
645 | if( (nt>1) && (nt<=numSec) ) { |
---|
646 | test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) ); |
---|
647 | dum = (pi/anpn)*nt*neutmulAn[counter]*neutnormAn[nt-1]/(2.0*n*n); |
---|
648 | |
---|
649 | if (std::fabs(dum) < 1.0) { |
---|
650 | if( test >= 1.0e-10 )excs += dum*test; |
---|
651 | } else { |
---|
652 | excs += dum*test; |
---|
653 | } |
---|
654 | |
---|
655 | if (ran < excs) goto outOfLoopAn; // --------------------------> |
---|
656 | } |
---|
657 | } |
---|
658 | } |
---|
659 | } |
---|
660 | |
---|
661 | inElastic = false; // quasi-elastic scattering. |
---|
662 | return; |
---|
663 | } |
---|
664 | outOfLoopAn: // <--------------------------------------------------------- |
---|
665 | vecLen = 0; |
---|
666 | } |
---|
667 | } |
---|
668 | |
---|
669 | nt = np + nm + nz; |
---|
670 | while ( nt > 0) |
---|
671 | { |
---|
672 | G4double ran = G4UniformRand(); |
---|
673 | if ( ran < (G4double)np/nt) |
---|
674 | { |
---|
675 | if( np > 0 ) |
---|
676 | { pv[vecLen++] = PionPlus; |
---|
677 | np--; |
---|
678 | } |
---|
679 | } |
---|
680 | else if ( ran < (G4double)(np+nm)/nt) |
---|
681 | { |
---|
682 | if( nm > 0 ) |
---|
683 | { |
---|
684 | pv[vecLen++] = PionMinus; |
---|
685 | nm--; |
---|
686 | } |
---|
687 | } |
---|
688 | else |
---|
689 | { |
---|
690 | if( nz > 0 ) |
---|
691 | { |
---|
692 | pv[vecLen++] = PionZero; |
---|
693 | nz--; |
---|
694 | } |
---|
695 | } |
---|
696 | nt = np + nm + nz; |
---|
697 | } |
---|
698 | if (verboseLevel > 1) |
---|
699 | { |
---|
700 | G4cout << "Particles produced: " ; |
---|
701 | G4cout << pv[0].getName() << " " ; |
---|
702 | G4cout << pv[1].getName() << " " ; |
---|
703 | for (i=2; i < vecLen; i++) |
---|
704 | { |
---|
705 | G4cout << pv[i].getName() << " " ; |
---|
706 | } |
---|
707 | G4cout << G4endl; |
---|
708 | } |
---|
709 | return; |
---|
710 | } |
---|
711 | |
---|
712 | |
---|
713 | |
---|
714 | |
---|
715 | |
---|
716 | |
---|
717 | |
---|
718 | |
---|
719 | |
---|
720 | |
---|