1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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7 | // * conditions of the Geant4 Software License, included in the file * |
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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: G4HEPionPlusInelastic.cc,v 1.14.2.1 2008/04/23 16:31:22 gcosmo Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-01-patch-02 $ |
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29 | // |
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30 | // |
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31 | |
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32 | #include "globals.hh" |
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33 | #include "G4ios.hh" |
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34 | |
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35 | // |
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36 | // G4 Process: Gheisha High Energy Collision model. |
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37 | // This includes the high energy cascading model, the two-body-resonance model |
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38 | // and the low energy two-body model. Not included are the low energy stuff like |
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39 | // nuclear reactions, nuclear fission without any cascading and all processes for |
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40 | // particles at rest. |
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41 | // First work done by J.L.Chuma and F.W.Jones, TRIUMF, June 96. |
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42 | // H. Fesefeldt, RWTH-Aachen, 23-October-1996 |
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43 | // Last modified: 29-July-1998 |
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44 | |
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45 | #include "G4HEPionPlusInelastic.hh" |
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46 | |
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47 | G4HadFinalState * G4HEPionPlusInelastic:: |
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48 | ApplyYourself( const G4HadProjectile &aTrack, 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 | // G4DynamicParticle *originalTarget = targetNucleus.ReturnTargetParticle(); |
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53 | const G4double A = targetNucleus.GetN(); |
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54 | const G4double Z = targetNucleus.GetZ(); |
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55 | G4HEVector incidentParticle(aParticle); |
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56 | |
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57 | G4double atomicNumber = Z; |
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58 | G4double atomicWeight = A; |
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59 | |
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60 | G4int incidentCode = incidentParticle.getCode(); |
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61 | G4double incidentMass = incidentParticle.getMass(); |
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62 | G4double incidentTotalEnergy = incidentParticle.getEnergy(); |
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63 | G4double incidentTotalMomentum = incidentParticle.getTotalMomentum(); |
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64 | G4double incidentKineticEnergy = incidentTotalEnergy - incidentMass; |
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65 | |
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66 | if(incidentKineticEnergy < 1.) |
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67 | { |
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68 | G4cout << "G4HEPionPlusInelastic: incident energy < 1 GeV" << G4endl; |
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69 | } |
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70 | if(verboseLevel > 1) |
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71 | { |
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72 | G4cout << "G4HEPionPlusInelastic::ApplyYourself" << G4endl; |
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73 | G4cout << "incident particle " << incidentParticle.getName() |
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74 | << "mass " << incidentMass |
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75 | << "kinetic energy " << incidentKineticEnergy |
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76 | << G4endl; |
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77 | G4cout << "target material with (A,Z) = (" |
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78 | << atomicWeight << "," << atomicNumber << ")" << G4endl; |
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79 | } |
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80 | |
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81 | G4double inelasticity = NuclearInelasticity(incidentKineticEnergy, |
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82 | atomicWeight, atomicNumber); |
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83 | if(verboseLevel > 1) |
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84 | G4cout << "nuclear inelasticity = " << inelasticity << G4endl; |
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85 | |
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86 | incidentKineticEnergy -= inelasticity; |
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87 | |
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88 | G4double excitationEnergyGNP = 0.; |
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89 | G4double excitationEnergyDTA = 0.; |
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90 | |
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91 | G4double excitation = NuclearExcitation(incidentKineticEnergy, |
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92 | atomicWeight, atomicNumber, |
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93 | excitationEnergyGNP, |
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94 | excitationEnergyDTA); |
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95 | if(verboseLevel > 1) |
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96 | G4cout << "nuclear excitation = " << excitation << excitationEnergyGNP |
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97 | << excitationEnergyDTA << G4endl; |
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98 | |
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99 | |
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100 | incidentKineticEnergy -= excitation; |
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101 | incidentTotalEnergy = incidentKineticEnergy + incidentMass; |
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102 | incidentTotalMomentum = std::sqrt( (incidentTotalEnergy-incidentMass) |
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103 | *(incidentTotalEnergy+incidentMass)); |
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104 | |
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105 | |
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106 | G4HEVector targetParticle; |
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107 | if(G4UniformRand() < atomicNumber/atomicWeight) |
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108 | { |
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109 | targetParticle.setDefinition("Proton"); |
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110 | } |
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111 | else |
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112 | { |
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113 | targetParticle.setDefinition("Neutron"); |
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114 | } |
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115 | |
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116 | G4double targetMass = targetParticle.getMass(); |
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117 | G4double centerOfMassEnergy = std::sqrt( incidentMass*incidentMass + targetMass*targetMass |
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118 | + 2.0*targetMass*incidentTotalEnergy); |
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119 | G4double availableEnergy = centerOfMassEnergy - targetMass - incidentMass; |
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120 | |
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121 | // this was the meaning of inElastic in the |
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122 | // original Gheisha stand-alone version. |
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123 | // G4bool inElastic = InElasticCrossSectionInFirstInt |
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124 | // (availableEnergy, incidentCode, incidentTotalMomentum); |
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125 | // by unknown reasons, it has been replaced |
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126 | // to the following code in Geant??? |
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127 | G4bool inElastic = true; |
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128 | // if (G4UniformRand() < elasticCrossSection/totalCrossSection) inElastic = false; |
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129 | |
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130 | vecLength = 0; |
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131 | |
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132 | if(verboseLevel > 1) |
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133 | G4cout << "ApplyYourself: CallFirstIntInCascade for particle " |
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134 | << incidentCode << G4endl; |
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135 | |
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136 | G4bool successful = false; |
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137 | |
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138 | if(inElastic || (!inElastic && atomicWeight < 1.5)) |
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139 | { |
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140 | FirstIntInCasPionPlus(inElastic, availableEnergy, pv, vecLength, |
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141 | incidentParticle, targetParticle, atomicWeight); |
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142 | |
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143 | if(verboseLevel > 1) |
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144 | G4cout << "ApplyYourself::StrangeParticlePairProduction" << G4endl; |
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145 | |
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146 | |
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147 | if ((vecLength > 0) && (availableEnergy > 1.)) |
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148 | StrangeParticlePairProduction( availableEnergy, centerOfMassEnergy, |
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149 | pv, vecLength, |
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150 | incidentParticle, targetParticle); |
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151 | HighEnergyCascading( 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 | HighEnergyClusterProduction( successful, pv, vecLength, |
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157 | excitationEnergyGNP, excitationEnergyDTA, |
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158 | incidentParticle, targetParticle, |
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159 | atomicWeight, atomicNumber); |
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160 | if (!successful) |
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161 | MediumEnergyCascading( successful, pv, vecLength, |
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162 | excitationEnergyGNP, excitationEnergyDTA, |
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163 | incidentParticle, targetParticle, |
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164 | atomicWeight, atomicNumber); |
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165 | |
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166 | if (!successful) |
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167 | MediumEnergyClusterProduction( successful, pv, vecLength, |
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168 | excitationEnergyGNP, excitationEnergyDTA, |
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169 | incidentParticle, targetParticle, |
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170 | atomicWeight, atomicNumber); |
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171 | if (!successful) |
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172 | QuasiElasticScattering( successful, pv, vecLength, |
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173 | excitationEnergyGNP, excitationEnergyDTA, |
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174 | incidentParticle, targetParticle, |
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175 | atomicWeight, atomicNumber); |
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176 | } |
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177 | if (!successful) |
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178 | { |
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179 | ElasticScattering( successful, pv, vecLength, |
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180 | incidentParticle, |
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181 | atomicWeight, atomicNumber); |
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182 | } |
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183 | |
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184 | if (!successful) |
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185 | { |
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186 | G4cout << "GHEInelasticInteraction::ApplyYourself fails to produce final state particles" << G4endl; |
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187 | } |
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188 | |
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189 | FillParticleChange(pv, vecLength); |
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190 | delete [] pv; |
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191 | theParticleChange.SetStatusChange(stopAndKill); |
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192 | return & theParticleChange; |
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193 | } |
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194 | |
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195 | void |
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196 | G4HEPionPlusInelastic::FirstIntInCasPionPlus( G4bool &inElastic, |
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197 | const G4double availableEnergy, |
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198 | G4HEVector pv[], |
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199 | G4int &vecLen, |
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200 | G4HEVector incidentParticle, |
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201 | G4HEVector targetParticle, |
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202 | const G4double atomicWeight) |
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203 | |
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204 | // Pion+ undergoes interaction with nucleon within a nucleus. Check if it is |
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205 | // energetically possible to produce pions/kaons. In not, assume nuclear excitation |
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206 | // occurs and input particle is degraded in energy. No other particles are produced. |
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207 | // If reaction is possible, find the correct number of pions/protons/neutrons |
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208 | // produced using an interpolation to multiplicity data. Replace some pions or |
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209 | // protons/neutrons by kaons or strange baryons according to the average |
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210 | // multiplicity per inelastic reaction. |
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211 | |
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212 | { |
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213 | static const G4double expxu = std::log(MAXFLOAT); // upper bound for arg. of exp |
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214 | static const G4double expxl = -expxu; // lower bound for arg. of exp |
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215 | |
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216 | static const G4double protb = 0.7; |
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217 | static const G4double neutb = 0.7; |
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218 | static const G4double c = 1.25; |
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219 | |
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220 | static const G4int numMul = 1200; |
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221 | static const G4int numSec = 60; |
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222 | |
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223 | G4int neutronCode = Neutron.getCode(); |
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224 | G4int protonCode = Proton.getCode(); |
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225 | G4double pionMass = PionPlus.getMass(); |
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226 | |
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227 | G4int targetCode = targetParticle.getCode(); |
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228 | // G4double incidentMass = incidentParticle.getMass(); |
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229 | // G4double incidentEnergy = incidentParticle.getEnergy(); |
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230 | G4double incidentTotalMomentum = incidentParticle.getTotalMomentum(); |
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231 | |
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232 | static G4bool first = true; |
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233 | static G4double protmul[numMul], protnorm[numSec]; // proton constants |
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234 | static G4double neutmul[numMul], neutnorm[numSec]; // neutron constants |
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235 | |
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236 | // misc. local variables |
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237 | // np = number of pi+, nm = number of pi-, nz = number of pi0 |
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238 | |
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239 | G4int i, counter, nt, np, nm, nz; |
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240 | |
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241 | if( first ) |
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242 | { // compute normalization constants, this will only be done once |
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243 | first = false; |
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244 | for( i=0; i<numMul; i++ )protmul[i] = 0.0; |
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245 | for( i=0; i<numSec; i++ )protnorm[i] = 0.0; |
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246 | counter = -1; |
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247 | for( np=0; np<(numSec/3); np++ ) |
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248 | { |
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249 | for( nm=Imax(0,np-2); nm<=np; nm++ ) |
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250 | { |
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251 | for( nz=0; nz<numSec/3; nz++ ) |
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252 | { |
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253 | if( ++counter < numMul ) |
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254 | { |
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255 | nt = np+nm+nz; |
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256 | if( (nt>0) && (nt<=numSec) ) |
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257 | { |
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258 | protmul[counter] = |
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259 | pmltpc(np,nm,nz,nt,protb,c) ; |
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260 | protnorm[nt-1] += protmul[counter]; |
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261 | } |
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262 | } |
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263 | } |
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264 | } |
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265 | } |
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266 | for( i=0; i<numMul; i++ )neutmul[i] = 0.0; |
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267 | for( i=0; i<numSec; i++ )neutnorm[i] = 0.0; |
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268 | counter = -1; |
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269 | for( np=0; np<numSec/3; np++ ) |
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270 | { |
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271 | for( nm=Imax(0,np-1); nm<=(np+1); nm++ ) |
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272 | { |
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273 | for( nz=0; nz<numSec/3; nz++ ) |
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274 | { |
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275 | if( ++counter < numMul ) |
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276 | { |
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277 | nt = np+nm+nz; |
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278 | if( (nt>0) && (nt<=numSec) ) |
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279 | { |
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280 | neutmul[counter] = |
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281 | pmltpc(np,nm,nz,nt,neutb,c); |
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282 | neutnorm[nt-1] += neutmul[counter]; |
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283 | } |
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284 | } |
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285 | } |
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286 | } |
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287 | } |
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288 | for( i=0; i<numSec; i++ ) |
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289 | { |
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290 | if( protnorm[i] > 0.0 )protnorm[i] = 1.0/protnorm[i]; |
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291 | if( neutnorm[i] > 0.0 )neutnorm[i] = 1.0/neutnorm[i]; |
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292 | } |
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293 | } // end of initialization |
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294 | |
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295 | |
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296 | // initialize the first two places |
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297 | // the same as beam and target |
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298 | pv[0] = incidentParticle; |
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299 | pv[1] = targetParticle; |
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300 | vecLen = 2; |
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301 | |
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302 | if( !inElastic ) |
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303 | { // quasi-elastic scattering, no pions produced |
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304 | if( targetCode == neutronCode ) |
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305 | { |
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306 | G4double cech[] = {0.33,0.27,0.29,0.31,0.27,0.18,0.13,0.10,0.09,0.07}; |
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307 | G4int iplab = G4int( Amin( 9.0, incidentTotalMomentum*5. ) ); |
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308 | if( G4UniformRand() < cech[iplab]/std::pow(atomicWeight,0.42) ) |
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309 | { // charge exchange pi+ n -> pi0 p |
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310 | pv[0] = PionZero; |
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311 | pv[1] = Proton; |
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312 | } |
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313 | } |
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314 | return; |
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315 | } |
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316 | else if (availableEnergy <= pionMass) |
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317 | return; |
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318 | |
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319 | // inelastic scattering |
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320 | |
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321 | np = 0, nm = 0, nz = 0; |
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322 | G4double eab = availableEnergy; |
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323 | G4int ieab = G4int( eab*5.0 ); |
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324 | |
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325 | G4double supp[] = {0., 0.2, 0.45, 0.55, 0.65, 0.75, 0.85, 0.90, 0.94, 0.98}; |
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326 | if( (ieab <= 9) && (G4UniformRand() >= supp[ieab]) ) |
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327 | { |
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328 | // suppress high multiplicity events at low momentum |
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329 | // only one additional pion will be produced |
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330 | G4double w0, wp, wm, wt, ran; |
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331 | if( targetCode == protonCode ) // target is a proton |
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332 | { |
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333 | w0 = - sqr(1.+protb)/(2.*c*c); |
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334 | wp = w0 = std::exp(w0); |
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335 | if( G4UniformRand() < w0/(w0+wp) ) |
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336 | { np = 0; nm = 0; nz = 1; } |
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337 | else |
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338 | { np = 1; nm = 0; nz = 0; } |
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339 | } |
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340 | else |
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341 | { // target is a neutron |
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342 | w0 = -sqr(1.+neutb)/(2.*c*c); |
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343 | wp = w0 = std::exp(w0); |
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344 | wm = -sqr(-1.+neutb)/(2.*c*c); |
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345 | wm = std::exp(wm); |
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346 | wt = w0+wp+wm; |
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347 | wp = w0+wp; |
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348 | ran = G4UniformRand(); |
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349 | if( ran < w0/wt) |
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350 | { np = 0; nm = 0; nz = 1; } |
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351 | else if( ran < wp/wt) |
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352 | { np = 1; nm = 0; nz = 0; } |
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353 | else |
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354 | { np = 0; nm = 1; nz = 0; } |
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355 | } |
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356 | } |
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357 | else |
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358 | { |
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359 | // number of total particles vs. centre of mass Energy - 2*proton mass |
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360 | |
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361 | G4double aleab = std::log(availableEnergy); |
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362 | G4double n = 3.62567+aleab*(0.665843+aleab*(0.336514 |
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363 | + aleab*(0.117712+0.0136912*aleab))) - 2.0; |
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364 | |
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365 | // normalization constant for kno-distribution. |
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366 | // calculate first the sum of all constants, check for numerical problems. |
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367 | G4double test, dum, anpn = 0.0; |
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368 | |
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369 | for (nt=1; nt<=numSec; nt++) { |
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370 | test = std::exp( Amin( expxu, Amax( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) ); |
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371 | dum = pi*nt/(2.0*n*n); |
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372 | if (std::fabs(dum) < 1.0) { |
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373 | if( test >= 1.0e-10 )anpn += dum*test; |
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374 | } else { |
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375 | anpn += dum*test; |
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376 | } |
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377 | } |
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378 | |
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379 | G4double ran = G4UniformRand(); |
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380 | G4double excs = 0.0; |
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381 | if( targetCode == protonCode ) |
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382 | { |
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383 | counter = -1; |
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384 | for (np=0; np<numSec/3; np++) { |
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385 | for (nm=Imax(0,np-2); nm<=np; nm++) { |
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386 | for (nz=0; nz<numSec/3; nz++) { |
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387 | if (++counter < numMul) { |
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388 | nt = np+nm+nz; |
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389 | if ( (nt>0) && (nt<=numSec) ) { |
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390 | test = std::exp( Amin( expxu, Amax( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) ); |
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391 | dum = (pi/anpn)*nt*protmul[counter]*protnorm[nt-1]/(2.0*n*n); |
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392 | if (std::fabs(dum) < 1.0) { |
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393 | if( test >= 1.0e-10 )excs += dum*test; |
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394 | } else { |
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395 | excs += dum*test; |
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396 | } |
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397 | if (ran < excs) goto outOfLoop; //------------------> |
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398 | } |
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399 | } |
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400 | } |
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401 | } |
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402 | } |
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403 | |
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404 | // 3 previous loops continued to the end |
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405 | inElastic = false; // quasi-elastic scattering |
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406 | return; |
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407 | } |
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408 | else |
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409 | { // target must be a neutron |
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410 | counter = -1; |
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411 | for (np=0; np<numSec/3; np++) { |
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412 | for (nm=Imax(0,np-1); nm<=(np+1); nm++) { |
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413 | for (nz=0; nz<numSec/3; nz++) { |
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414 | if (++counter < numMul) { |
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415 | nt = np+nm+nz; |
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416 | if ( (nt>=1) && (nt<=numSec) ) { |
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417 | test = std::exp( Amin( expxu, Amax( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) ); |
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418 | dum = (pi/anpn)*nt*neutmul[counter]*neutnorm[nt-1]/(2.0*n*n); |
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419 | if (std::fabs(dum) < 1.0) { |
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420 | if( test >= 1.0e-10 )excs += dum*test; |
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421 | } else { |
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422 | excs += dum*test; |
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423 | } |
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424 | if (ran < excs) goto outOfLoop; // ---------------------> |
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425 | } |
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426 | } |
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427 | } |
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428 | } |
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429 | } |
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430 | // 3 previous loops continued to the end |
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431 | inElastic = false; // quasi-elastic scattering. |
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432 | return; |
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433 | } |
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434 | } |
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435 | outOfLoop: // <-------------------------------------------- |
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436 | |
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437 | if( targetCode == protonCode) |
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438 | { |
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439 | if( np == nm) |
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440 | { |
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441 | } |
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442 | else if (np == (1+nm)) |
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443 | { |
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444 | if( G4UniformRand() < 0.5) |
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445 | { |
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446 | pv[1] = Neutron; |
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447 | } |
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448 | else |
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449 | { |
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450 | pv[0] = PionZero; |
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451 | } |
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452 | } |
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453 | else |
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454 | { |
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455 | pv[0] = PionZero; |
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456 | pv[1] = Neutron; |
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457 | } |
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458 | } |
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459 | else |
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460 | { |
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461 | if( np == nm) |
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462 | { |
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463 | if( G4UniformRand() < 0.25) |
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464 | { |
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465 | pv[0] = PionZero; |
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466 | pv[1] = Proton; |
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467 | } |
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468 | else |
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469 | { |
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470 | } |
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471 | } |
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472 | else if ( np == (1+nm)) |
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473 | { |
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474 | pv[0] = PionZero; |
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475 | } |
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476 | else |
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477 | { |
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478 | pv[1] = Proton; |
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479 | } |
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480 | } |
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481 | |
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482 | |
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483 | nt = np + nm + nz; |
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484 | while ( nt > 0) |
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485 | { |
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486 | G4double ran = G4UniformRand(); |
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487 | if ( ran < (G4double)np/nt) |
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488 | { |
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489 | if( np > 0 ) |
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490 | { pv[vecLen++] = PionPlus; |
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491 | np--; |
---|
492 | } |
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493 | } |
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494 | else if ( ran < (G4double)(np+nm)/nt) |
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495 | { |
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496 | if( nm > 0 ) |
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497 | { |
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498 | pv[vecLen++] = PionMinus; |
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499 | nm--; |
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500 | } |
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501 | } |
---|
502 | else |
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503 | { |
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504 | if( nz > 0 ) |
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505 | { |
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506 | pv[vecLen++] = PionZero; |
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507 | nz--; |
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508 | } |
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509 | } |
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510 | nt = np + nm + nz; |
---|
511 | } |
---|
512 | if (verboseLevel > 1) |
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513 | { |
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514 | G4cout << "Particles produced: " ; |
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515 | G4cout << pv[0].getName() << " " ; |
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516 | G4cout << pv[1].getName() << " " ; |
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517 | for (i=2; i < vecLen; i++) |
---|
518 | { |
---|
519 | G4cout << pv[i].getName() << " " ; |
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520 | } |
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521 | G4cout << G4endl; |
---|
522 | } |
---|
523 | return; |
---|
524 | } |
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525 | |
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526 | |
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527 | |
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528 | |
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529 | |
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530 | |
---|
531 | |
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532 | |
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533 | |
---|