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 | // G4AntiProtonAnnihilationAtRest physics process |
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27 | // Larry Felawka (TRIUMF), April 1998 |
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28 | //--------------------------------------------------------------------- |
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29 | |
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30 | #include "G4AntiProtonAnnihilationAtRest.hh" |
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31 | #include "G4DynamicParticle.hh" |
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32 | #include "G4ParticleTypes.hh" |
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33 | #include "Randomize.hh" |
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34 | #include <string.h> |
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35 | #include <cmath> |
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36 | #include <stdio.h> |
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37 | |
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38 | #define MAX_SECONDARIES 100 |
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39 | |
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40 | // constructor |
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41 | |
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42 | G4AntiProtonAnnihilationAtRest::G4AntiProtonAnnihilationAtRest(const G4String& processName, |
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43 | G4ProcessType aType ) : |
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44 | G4VRestProcess (processName, aType), // initialization |
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45 | massPionMinus(G4PionMinus::PionMinus()->GetPDGMass()/GeV), |
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46 | massProton(G4Proton::Proton()->GetPDGMass()/GeV), |
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47 | massPionZero(G4PionZero::PionZero()->GetPDGMass()/GeV), |
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48 | massAntiProton(G4AntiProton::AntiProton()->GetPDGMass()/GeV), |
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49 | massPionPlus(G4PionPlus::PionPlus()->GetPDGMass()/GeV), |
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50 | massGamma(G4Gamma::Gamma()->GetPDGMass()/GeV), |
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51 | pdefGamma(G4Gamma::Gamma()), |
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52 | pdefPionPlus(G4PionPlus::PionPlus()), |
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53 | pdefPionZero(G4PionZero::PionZero()), |
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54 | pdefPionMinus(G4PionMinus::PionMinus()), |
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55 | pdefProton(G4Proton::Proton()), |
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56 | pdefAntiProton(G4AntiProton::AntiProton()), |
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57 | pdefNeutron(G4Neutron::Neutron()), |
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58 | pdefDeuteron(G4Deuteron::Deuteron()), |
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59 | pdefTriton(G4Triton::Triton()), |
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60 | pdefAlpha(G4Alpha::Alpha()) |
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61 | { |
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62 | if (verboseLevel>0) { |
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63 | G4cout << GetProcessName() << " is created "<< G4endl; |
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64 | } |
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65 | SetProcessSubType(fHadronAtRest); |
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66 | pv = new G4GHEKinematicsVector [MAX_SECONDARIES+1]; |
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67 | eve = new G4GHEKinematicsVector [MAX_SECONDARIES]; |
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68 | gkin = new G4GHEKinematicsVector [MAX_SECONDARIES]; |
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69 | |
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70 | } |
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71 | |
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72 | // destructor |
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73 | |
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74 | G4AntiProtonAnnihilationAtRest::~G4AntiProtonAnnihilationAtRest() |
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75 | { |
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76 | delete [] pv; |
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77 | delete [] eve; |
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78 | delete [] gkin; |
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79 | } |
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80 | |
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81 | |
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82 | // methods............................................................................. |
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83 | |
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84 | G4bool G4AntiProtonAnnihilationAtRest::IsApplicable( |
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85 | const G4ParticleDefinition& particle |
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86 | ) |
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87 | { |
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88 | return ( &particle == pdefAntiProton ); |
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89 | |
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90 | } |
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91 | |
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92 | // Warning - this method may be optimized away if made "inline" |
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93 | G4int G4AntiProtonAnnihilationAtRest::GetNumberOfSecondaries() |
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94 | { |
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95 | return ( ngkine ); |
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96 | |
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97 | } |
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98 | |
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99 | // Warning - this method may be optimized away if made "inline" |
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100 | G4GHEKinematicsVector* G4AntiProtonAnnihilationAtRest::GetSecondaryKinematics() |
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101 | { |
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102 | return ( &gkin[0] ); |
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103 | |
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104 | } |
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105 | |
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106 | G4double G4AntiProtonAnnihilationAtRest::AtRestGetPhysicalInteractionLength( |
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107 | const G4Track& track, |
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108 | G4ForceCondition* condition |
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109 | ) |
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110 | { |
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111 | // beggining of tracking |
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112 | ResetNumberOfInteractionLengthLeft(); |
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113 | |
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114 | // condition is set to "Not Forced" |
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115 | *condition = NotForced; |
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116 | |
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117 | // get mean life time |
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118 | currentInteractionLength = GetMeanLifeTime(track, condition); |
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119 | |
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120 | if ((currentInteractionLength <0.0) || (verboseLevel>2)){ |
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121 | G4cout << "G4AntiProtonAnnihilationAtRestProcess::AtRestGetPhysicalInteractionLength "; |
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122 | G4cout << "[ " << GetProcessName() << "]" <<G4endl; |
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123 | track.GetDynamicParticle()->DumpInfo(); |
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124 | G4cout << " in Material " << track.GetMaterial()->GetName() <<G4endl; |
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125 | G4cout << "MeanLifeTime = " << currentInteractionLength/ns << "[ns]" <<G4endl; |
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126 | } |
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127 | |
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128 | return theNumberOfInteractionLengthLeft * currentInteractionLength; |
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129 | |
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130 | } |
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131 | |
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132 | G4VParticleChange* G4AntiProtonAnnihilationAtRest::AtRestDoIt( |
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133 | const G4Track& track, |
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134 | const G4Step& |
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135 | ) |
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136 | // |
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137 | // Handles AntiProtons at rest; a AntiProton can either create secondaries or |
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138 | // do nothing (in which case it should be sent back to decay-handling |
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139 | // section |
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140 | // |
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141 | { |
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142 | |
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143 | // Initialize ParticleChange |
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144 | // all members of G4VParticleChange are set to equal to |
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145 | // corresponding member in G4Track |
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146 | |
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147 | aParticleChange.Initialize(track); |
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148 | |
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149 | // Store some global quantities that depend on current material and particle |
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150 | |
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151 | globalTime = track.GetGlobalTime()/s; |
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152 | G4Material * aMaterial = track.GetMaterial(); |
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153 | const G4int numberOfElements = aMaterial->GetNumberOfElements(); |
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154 | const G4ElementVector* theElementVector = aMaterial->GetElementVector(); |
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155 | |
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156 | const G4double* theAtomicNumberDensity = aMaterial->GetAtomicNumDensityVector(); |
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157 | G4double normalization = 0; |
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158 | for ( G4int i1=0; i1 < numberOfElements; i1++ ) |
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159 | { |
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160 | normalization += theAtomicNumberDensity[i1] ; // change when nucleon specific |
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161 | // probabilities are included. |
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162 | } |
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163 | G4double runningSum= 0.; |
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164 | G4double random = G4UniformRand()*normalization; |
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165 | for ( G4int i2=0; i2 < numberOfElements; i2++ ) |
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166 | { |
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167 | runningSum += theAtomicNumberDensity[i2]; // change when nucleon specific |
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168 | // probabilities are included. |
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169 | if (random<=runningSum) |
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170 | { |
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171 | targetCharge = G4double((*theElementVector)[i2]->GetZ()); |
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172 | targetAtomicMass = (*theElementVector)[i2]->GetN(); |
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173 | } |
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174 | } |
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175 | if (random>runningSum) |
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176 | { |
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177 | targetCharge = G4double((*theElementVector)[numberOfElements-1]->GetZ()); |
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178 | targetAtomicMass = (*theElementVector)[numberOfElements-1]->GetN(); |
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179 | |
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180 | } |
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181 | |
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182 | if (verboseLevel>1) { |
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183 | G4cout << "G4AntiProtonAnnihilationAtRest::AtRestDoIt is invoked " <<G4endl; |
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184 | } |
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185 | |
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186 | G4ParticleMomentum momentum; |
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187 | G4float localtime; |
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188 | |
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189 | G4ThreeVector position = track.GetPosition(); |
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190 | |
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191 | GenerateSecondaries(); // Generate secondaries |
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192 | |
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193 | aParticleChange.SetNumberOfSecondaries( ngkine ); |
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194 | |
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195 | for ( G4int isec = 0; isec < ngkine; isec++ ) { |
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196 | G4DynamicParticle* aNewParticle = new G4DynamicParticle; |
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197 | aNewParticle->SetDefinition( gkin[isec].GetParticleDef() ); |
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198 | aNewParticle->SetMomentum( gkin[isec].GetMomentum() * GeV ); |
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199 | |
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200 | localtime = globalTime + gkin[isec].GetTOF(); |
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201 | |
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202 | G4Track* aNewTrack = new G4Track( aNewParticle, localtime*s, position ); |
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203 | aNewTrack->SetTouchableHandle(track.GetTouchableHandle()); |
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204 | aParticleChange.AddSecondary( aNewTrack ); |
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205 | |
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206 | } |
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207 | |
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208 | aParticleChange.ProposeLocalEnergyDeposit( 0.0*GeV ); |
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209 | |
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210 | aParticleChange.ProposeTrackStatus(fStopAndKill); // Kill the incident AntiProton |
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211 | |
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212 | // clear InteractionLengthLeft |
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213 | |
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214 | ResetNumberOfInteractionLengthLeft(); |
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215 | |
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216 | return &aParticleChange; |
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217 | |
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218 | } |
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219 | |
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220 | |
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221 | void G4AntiProtonAnnihilationAtRest::GenerateSecondaries() |
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222 | { |
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223 | static G4int index; |
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224 | static G4int l; |
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225 | static G4int nopt; |
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226 | static G4int i; |
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227 | static G4ParticleDefinition* jnd; |
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228 | |
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229 | for (i = 1; i <= MAX_SECONDARIES; ++i) { |
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230 | pv[i].SetZero(); |
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231 | } |
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232 | |
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233 | ngkine = 0; // number of generated secondary particles |
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234 | ntot = 0; |
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235 | result.SetZero(); |
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236 | result.SetMass( massAntiProton ); |
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237 | result.SetKineticEnergyAndUpdate( 0. ); |
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238 | result.SetTOF( 0. ); |
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239 | result.SetParticleDef( pdefAntiProton ); |
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240 | |
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241 | AntiProtonAnnihilation(&nopt); |
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242 | |
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243 | // *** CHECK WHETHER THERE ARE NEW PARTICLES GENERATED *** |
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244 | if (ntot != 0 || result.GetParticleDef() != pdefAntiProton) { |
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245 | // *** CURRENT PARTICLE IS NOT THE SAME AS IN THE BEGINNING OR/AND *** |
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246 | // *** ONE OR MORE SECONDARIES HAVE BEEN GENERATED *** |
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247 | |
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248 | // --- INITIAL PARTICLE TYPE HAS BEEN CHANGED ==> PUT NEW TYPE ON --- |
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249 | // --- THE GEANT TEMPORARY STACK --- |
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250 | |
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251 | // --- PUT PARTICLE ON THE STACK --- |
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252 | gkin[0] = result; |
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253 | gkin[0].SetTOF( result.GetTOF() * 5e-11 ); |
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254 | ngkine = 1; |
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255 | |
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256 | // --- ALL QUANTITIES ARE TAKEN FROM THE GHEISHA STACK WHERE THE --- |
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257 | // --- CONVENTION IS THE FOLLOWING --- |
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258 | |
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259 | // --- ONE OR MORE SECONDARIES HAVE BEEN GENERATED --- |
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260 | for (l = 1; l <= ntot; ++l) { |
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261 | index = l - 1; |
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262 | jnd = eve[index].GetParticleDef(); |
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263 | |
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264 | // --- ADD PARTICLE TO THE STACK IF STACK NOT YET FULL --- |
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265 | if (ngkine < MAX_SECONDARIES) { |
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266 | gkin[ngkine] = eve[index]; |
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267 | gkin[ngkine].SetTOF( eve[index].GetTOF() * 5e-11 ); |
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268 | ++ngkine; |
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269 | } |
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270 | } |
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271 | } |
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272 | else { |
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273 | // --- NO SECONDARIES GENERATED AND PARTICLE IS STILL THE SAME --- |
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274 | // --- ==> COPY EVERYTHING BACK IN THE CURRENT GEANT STACK --- |
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275 | ngkine = 0; |
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276 | ntot = 0; |
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277 | globalTime += result.GetTOF() * G4float(5e-11); |
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278 | } |
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279 | |
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280 | // --- LIMIT THE VALUE OF NGKINE IN CASE OF OVERFLOW --- |
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281 | ngkine = G4int(std::min(ngkine,G4int(MAX_SECONDARIES))); |
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282 | |
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283 | } // GenerateSecondaries |
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284 | |
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285 | |
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286 | void G4AntiProtonAnnihilationAtRest::Poisso(G4float xav, G4int *iran) |
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287 | { |
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288 | static G4int i; |
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289 | static G4float r, p1, p2, p3; |
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290 | static G4int mm; |
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291 | static G4float rr, ran, rrr, ran1; |
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292 | |
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293 | // *** GENERATION OF POISSON DISTRIBUTION *** |
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294 | // *** NVE 16-MAR-1988 CERN GENEVA *** |
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295 | // ORIGIN : H.FESEFELDT (27-OCT-1983) |
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296 | |
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297 | // --- USE NORMAL DISTRIBUTION FOR <X> > 9.9 --- |
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298 | if (xav > G4float(9.9)) { |
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299 | // ** NORMAL DISTRIBUTION WITH SIGMA**2 = <X> |
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300 | Normal(&ran1); |
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301 | ran1 = xav + ran1 * std::sqrt(xav); |
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302 | *iran = G4int(ran1); |
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303 | if (*iran < 0) { |
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304 | *iran = 0; |
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305 | } |
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306 | } |
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307 | else { |
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308 | mm = G4int(xav * G4float(5.)); |
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309 | *iran = 0; |
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310 | if (mm > 0) { |
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311 | r = std::exp(-G4double(xav)); |
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312 | ran1 = G4UniformRand(); |
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313 | if (ran1 > r) { |
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314 | rr = r; |
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315 | for (i = 1; i <= mm; ++i) { |
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316 | ++(*iran); |
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317 | if (i <= 5) { |
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318 | rrr = std::pow(xav, G4float(i)) / NFac(i); |
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319 | } |
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320 | // ** STIRLING' S FORMULA FOR LARGE NUMBERS |
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321 | if (i > 5) { |
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322 | rrr = std::exp(i * std::log(xav) - |
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323 | (i + G4float(.5)) * std::log(i * G4float(1.)) + |
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324 | i - G4float(.9189385)); |
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325 | } |
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326 | rr += r * rrr; |
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327 | if (ran1 <= rr) { |
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328 | break; |
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329 | } |
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330 | } |
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331 | } |
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332 | } |
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333 | else { |
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334 | // ** FOR VERY SMALL XAV TRY IRAN=1,2,3 |
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335 | p1 = xav * std::exp(-G4double(xav)); |
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336 | p2 = xav * p1 / G4float(2.); |
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337 | p3 = xav * p2 / G4float(3.); |
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338 | ran = G4UniformRand(); |
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339 | if (ran >= p3) { |
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340 | if (ran >= p2) { |
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341 | if (ran >= p1) { |
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342 | *iran = 0; |
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343 | } |
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344 | else { |
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345 | *iran = 1; |
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346 | } |
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347 | } |
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348 | else { |
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349 | *iran = 2; |
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350 | } |
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351 | } |
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352 | else { |
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353 | *iran = 3; |
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354 | } |
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355 | } |
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356 | } |
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357 | |
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358 | } // Poisso |
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359 | |
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360 | |
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361 | G4int G4AntiProtonAnnihilationAtRest::NFac(G4int n) |
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362 | { |
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363 | G4int ret_val; |
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364 | |
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365 | static G4int i, m; |
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366 | |
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367 | // *** NVE 16-MAR-1988 CERN GENEVA *** |
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368 | // ORIGIN : H.FESEFELDT (27-OCT-1983) |
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369 | |
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370 | ret_val = 1; |
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371 | m = n; |
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372 | if (m > 1) { |
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373 | if (m > 10) { |
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374 | m = 10; |
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375 | } |
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376 | for (i = 2; i <= m; ++i) { |
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377 | ret_val *= i; |
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378 | } |
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379 | } |
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380 | return ret_val; |
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381 | |
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382 | } // NFac |
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383 | |
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384 | |
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385 | void G4AntiProtonAnnihilationAtRest::Normal(G4float *ran) |
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386 | { |
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387 | static G4int i; |
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388 | |
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389 | // *** NVE 14-APR-1988 CERN GENEVA *** |
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390 | // ORIGIN : H.FESEFELDT (27-OCT-1983) |
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391 | |
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392 | *ran = G4float(-6.); |
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393 | for (i = 1; i <= 12; ++i) { |
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394 | *ran += G4UniformRand(); |
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395 | } |
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396 | |
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397 | } // Normal |
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398 | |
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399 | |
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400 | void G4AntiProtonAnnihilationAtRest::AntiProtonAnnihilation(G4int *nopt) |
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401 | { |
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402 | static G4float brr[3] = { G4float(.125),G4float(.25),G4float(.5) }; |
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403 | |
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404 | G4float r__1; |
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405 | |
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406 | static G4int i, ii, kk; |
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407 | static G4int nt; |
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408 | static G4float cfa, eka; |
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409 | static G4int ika, nbl; |
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410 | static G4float ran, pcm; |
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411 | static G4int isw; |
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412 | static G4float tex; |
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413 | static G4ParticleDefinition* ipa1; |
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414 | static G4float ran1, ran2, ekin, tkin; |
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415 | static G4float targ; |
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416 | static G4ParticleDefinition* inve; |
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417 | static G4float ekin1, ekin2, black; |
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418 | static G4float pnrat, rmnve1, rmnve2; |
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419 | static G4float ek, en; |
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420 | |
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421 | // *** ANTI PROTON ANNIHILATION AT REST *** |
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422 | // *** NVE 04-MAR-1988 CERN GENEVA *** |
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423 | // ORIGIN : H.FESEFELDT (09-JULY-1987) |
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424 | |
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425 | // NOPT=0 NO ANNIHILATION |
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426 | // NOPT=1 ANNIH.IN PI+ PI- |
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427 | // NOPT=2 ANNIH.IN PI0 PI0 |
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428 | // NOPT=3 ANNIH.IN PI- PI0 |
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429 | // NOPT=4 ANNIH.IN GAMMA GAMMA |
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430 | |
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431 | pv[1].SetZero(); |
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432 | pv[1].SetMass( massAntiProton ); |
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433 | pv[1].SetKineticEnergyAndUpdate( 0. ); |
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434 | pv[1].SetTOF( result.GetTOF() ); |
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435 | pv[1].SetParticleDef( result.GetParticleDef() ); |
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436 | isw = 1; |
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437 | ran = G4UniformRand(); |
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438 | if (ran > brr[0]) { |
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439 | isw = 2; |
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440 | } |
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441 | if (ran > brr[1]) { |
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442 | isw = 3; |
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443 | } |
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444 | if (ran > brr[2]) { |
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445 | isw = 4; |
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446 | } |
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447 | *nopt = isw; |
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448 | // ** |
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449 | // ** EVAPORATION |
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450 | // ** |
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451 | if (isw == 1) { |
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452 | rmnve1 = massPionPlus; |
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453 | rmnve2 = massPionMinus; |
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454 | } |
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455 | else if (isw == 2) { |
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456 | rmnve1 = massPionZero; |
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457 | rmnve2 = massPionZero; |
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458 | } |
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459 | else if (isw == 3) { |
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460 | rmnve1 = massPionMinus; |
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461 | rmnve2 = massPionZero; |
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462 | } |
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463 | else if (isw == 4) { |
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464 | rmnve1 = massGamma; |
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465 | rmnve2 = massGamma; |
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466 | } |
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467 | ek = massProton + massAntiProton - rmnve1 - rmnve2; |
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468 | tkin = ExNu(ek); |
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469 | ek -= tkin; |
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470 | if (ek < G4float(1e-4)) { |
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471 | ek = G4float(1e-4); |
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472 | } |
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473 | ek *= G4float(.5); |
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474 | en = ek + (rmnve1 + rmnve2) * G4float(.5); |
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475 | r__1 = en * en - rmnve1 * rmnve2; |
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476 | pcm = r__1 > 0 ? std::sqrt(r__1) : 0; |
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477 | pv[2].SetZero(); |
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478 | pv[2].SetMass( rmnve1 ); |
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479 | pv[3].SetZero(); |
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480 | pv[3].SetMass( rmnve2 ); |
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481 | if (isw > 3) { |
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482 | pv[2].SetMass( 0. ); |
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483 | pv[3].SetMass( 0. ); |
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484 | } |
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485 | pv[2].SetEnergyAndUpdate( std::sqrt(pv[2].GetMass()*pv[2].GetMass()+pcm*pcm) ); |
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486 | pv[2].SetTOF( result.GetTOF() ); |
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487 | pv[3].SetEnergy( std::sqrt(pv[3].GetMass()*pv[3].GetMass()+pcm*pcm) ); |
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488 | pv[3].SetMomentumAndUpdate( -pv[2].GetMomentum().x(), -pv[2].GetMomentum().y(), -pv[2].GetMomentum().z() ); |
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489 | pv[3].SetTOF( result.GetTOF() ); |
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490 | switch ((int)isw) { |
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491 | case 1: |
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492 | pv[2].SetParticleDef( pdefPionPlus ); |
---|
493 | pv[3].SetParticleDef( pdefPionMinus ); |
---|
494 | break; |
---|
495 | case 2: |
---|
496 | pv[2].SetParticleDef( pdefPionZero ); |
---|
497 | pv[3].SetParticleDef( pdefPionZero ); |
---|
498 | break; |
---|
499 | case 3: |
---|
500 | pv[2].SetParticleDef( pdefPionMinus ); |
---|
501 | pv[3].SetParticleDef( pdefPionZero ); |
---|
502 | break; |
---|
503 | case 4: |
---|
504 | pv[2].SetParticleDef( pdefGamma ); |
---|
505 | pv[3].SetParticleDef( pdefGamma ); |
---|
506 | break; |
---|
507 | default: |
---|
508 | break; |
---|
509 | } |
---|
510 | nt = 3; |
---|
511 | if (targetAtomicMass >= G4float(1.5)) { |
---|
512 | cfa = (targetAtomicMass - G4float(1.)) / |
---|
513 | G4float(120.) * G4float(.025) * |
---|
514 | std::exp(-G4double(targetAtomicMass - G4float(1.)) / G4float(120.)); |
---|
515 | targ = G4float(1.); |
---|
516 | tex = evapEnergy1; |
---|
517 | if (tex >= G4float(.001)) { |
---|
518 | black = (targ * G4float(1.25) + |
---|
519 | G4float(1.5)) * evapEnergy1 / (evapEnergy1 + evapEnergy3); |
---|
520 | Poisso(black, &nbl); |
---|
521 | if (G4float(G4int(targ) + nbl) > targetAtomicMass) { |
---|
522 | nbl = G4int(targetAtomicMass - targ); |
---|
523 | } |
---|
524 | if (nt + nbl > (MAX_SECONDARIES - 2)) { |
---|
525 | nbl = (MAX_SECONDARIES - 2) - nt; |
---|
526 | } |
---|
527 | if (nbl > 0) { |
---|
528 | ekin = tex / nbl; |
---|
529 | ekin2 = G4float(0.); |
---|
530 | for (i = 1; i <= nbl; ++i) { |
---|
531 | if (nt == (MAX_SECONDARIES - 2)) { |
---|
532 | continue; |
---|
533 | } |
---|
534 | if (ekin2 > tex) { |
---|
535 | break; |
---|
536 | } |
---|
537 | ran1 = G4UniformRand(); |
---|
538 | Normal(&ran2); |
---|
539 | ekin1 = -G4double(ekin) * std::log(ran1) - |
---|
540 | cfa * (ran2 * G4float(.5) + G4float(1.)); |
---|
541 | if (ekin1 < G4float(0.)) { |
---|
542 | ekin1 = std::log(ran1) * G4float(-.01); |
---|
543 | } |
---|
544 | ekin1 *= G4float(1.); |
---|
545 | ekin2 += ekin1; |
---|
546 | if (ekin2 > tex) { |
---|
547 | ekin1 = tex - (ekin2 - ekin1); |
---|
548 | } |
---|
549 | if (ekin1 < G4float(0.)) { |
---|
550 | ekin1 = G4float(.001); |
---|
551 | } |
---|
552 | ipa1 = pdefNeutron; |
---|
553 | pnrat = G4float(1.) - targetCharge / targetAtomicMass; |
---|
554 | if (G4UniformRand() > pnrat) { |
---|
555 | ipa1 = pdefProton; |
---|
556 | } |
---|
557 | ++nt; |
---|
558 | pv[nt].SetZero(); |
---|
559 | pv[nt].SetMass( ipa1->GetPDGMass()/GeV ); |
---|
560 | pv[nt].SetKineticEnergyAndUpdate( ekin1 ); |
---|
561 | pv[nt].SetTOF( result.GetTOF() ); |
---|
562 | pv[nt].SetParticleDef( ipa1 ); |
---|
563 | } |
---|
564 | if (targetAtomicMass >= G4float(230.) && ek <= G4float(2.)) { |
---|
565 | ii = nt + 1; |
---|
566 | kk = 0; |
---|
567 | eka = ek; |
---|
568 | if (eka > G4float(1.)) { |
---|
569 | eka *= eka; |
---|
570 | } |
---|
571 | if (eka < G4float(.1)) { |
---|
572 | eka = G4float(.1); |
---|
573 | } |
---|
574 | ika = G4int(G4float(3.6) / eka); |
---|
575 | for (i = 1; i <= nt; ++i) { |
---|
576 | --ii; |
---|
577 | if (pv[ii].GetParticleDef() != pdefProton) { |
---|
578 | continue; |
---|
579 | } |
---|
580 | ipa1 = pdefNeutron; |
---|
581 | pv[ii].SetMass( ipa1->GetPDGMass()/GeV ); |
---|
582 | pv[ii].SetParticleDef( ipa1 ); |
---|
583 | ++kk; |
---|
584 | if (kk > ika) { |
---|
585 | break; |
---|
586 | } |
---|
587 | } |
---|
588 | } |
---|
589 | } |
---|
590 | } |
---|
591 | // ** |
---|
592 | // ** THEN ALSO DEUTERONS, TRITONS AND ALPHAS |
---|
593 | // ** |
---|
594 | tex = evapEnergy3; |
---|
595 | if (tex >= G4float(.001)) { |
---|
596 | black = (targ * G4float(1.25) + G4float(1.5)) * evapEnergy3 / |
---|
597 | (evapEnergy1 + evapEnergy3); |
---|
598 | Poisso(black, &nbl); |
---|
599 | if (nt + nbl > (MAX_SECONDARIES - 2)) { |
---|
600 | nbl = (MAX_SECONDARIES - 2) - nt; |
---|
601 | } |
---|
602 | if (nbl > 0) { |
---|
603 | ekin = tex / nbl; |
---|
604 | ekin2 = G4float(0.); |
---|
605 | for (i = 1; i <= nbl; ++i) { |
---|
606 | if (nt == (MAX_SECONDARIES - 2)) { |
---|
607 | continue; |
---|
608 | } |
---|
609 | if (ekin2 > tex) { |
---|
610 | break; |
---|
611 | } |
---|
612 | ran1 = G4UniformRand(); |
---|
613 | Normal(&ran2); |
---|
614 | ekin1 = -G4double(ekin) * std::log(ran1) - |
---|
615 | cfa * (ran2 * G4float(.5) + G4float(1.)); |
---|
616 | if (ekin1 < G4float(0.)) { |
---|
617 | ekin1 = std::log(ran1) * G4float(-.01); |
---|
618 | } |
---|
619 | ekin1 *= G4float(1.); |
---|
620 | ekin2 += ekin1; |
---|
621 | if (ekin2 > tex) { |
---|
622 | ekin1 = tex - (ekin2 - ekin1); |
---|
623 | } |
---|
624 | if (ekin1 < G4float(0.)) { |
---|
625 | ekin1 = G4float(.001); |
---|
626 | } |
---|
627 | ran = G4UniformRand(); |
---|
628 | inve = pdefDeuteron; |
---|
629 | if (ran > G4float(.6)) { |
---|
630 | inve = pdefTriton; |
---|
631 | } |
---|
632 | if (ran > G4float(.9)) { |
---|
633 | inve = pdefAlpha; |
---|
634 | } |
---|
635 | ++nt; |
---|
636 | pv[nt].SetZero(); |
---|
637 | pv[nt].SetMass( inve->GetPDGMass()/GeV ); |
---|
638 | pv[nt].SetKineticEnergyAndUpdate( ekin1 ); |
---|
639 | pv[nt].SetTOF( result.GetTOF() ); |
---|
640 | pv[nt].SetParticleDef( inve ); |
---|
641 | } |
---|
642 | } |
---|
643 | } |
---|
644 | } |
---|
645 | result = pv[2]; |
---|
646 | if (nt == 2) { |
---|
647 | return; |
---|
648 | } |
---|
649 | for (i = 3; i <= nt; ++i) { |
---|
650 | if (ntot >= MAX_SECONDARIES) { |
---|
651 | return; |
---|
652 | } |
---|
653 | eve[ntot++] = pv[i]; |
---|
654 | } |
---|
655 | |
---|
656 | } // AntiProtonAnnihilation |
---|
657 | |
---|
658 | |
---|
659 | G4double G4AntiProtonAnnihilationAtRest::ExNu(G4float ek1) |
---|
660 | { |
---|
661 | G4float ret_val, r__1; |
---|
662 | |
---|
663 | static G4float cfa, gfa, ran1, ran2, ekin1, atno3; |
---|
664 | static G4int magic; |
---|
665 | static G4float fpdiv; |
---|
666 | |
---|
667 | // *** NUCLEAR EVAPORATION AS FUNCTION OF ATOMIC NUMBER ATNO *** |
---|
668 | // *** AND KINETIC ENERGY EKIN OF PRIMARY PARTICLE *** |
---|
669 | // *** NVE 04-MAR-1988 CERN GENEVA *** |
---|
670 | // ORIGIN : H.FESEFELDT (10-DEC-1986) |
---|
671 | |
---|
672 | ret_val = G4float(0.); |
---|
673 | if (targetAtomicMass >= G4float(1.5)) { |
---|
674 | magic = 0; |
---|
675 | if (G4int(targetCharge + G4float(.1)) == 82) { |
---|
676 | magic = 1; |
---|
677 | } |
---|
678 | ekin1 = ek1; |
---|
679 | if (ekin1 < G4float(.1)) { |
---|
680 | ekin1 = G4float(.1); |
---|
681 | } |
---|
682 | if (ekin1 > G4float(4.)) { |
---|
683 | ekin1 = G4float(4.); |
---|
684 | } |
---|
685 | // ** 0.35 VALUE AT 1 GEV |
---|
686 | // ** 0.05 VALUE AT 0.1 GEV |
---|
687 | cfa = G4float(.13043478260869565); |
---|
688 | cfa = cfa * std::log(ekin1) + G4float(.35); |
---|
689 | if (cfa < G4float(.15)) { |
---|
690 | cfa = G4float(.15); |
---|
691 | } |
---|
692 | ret_val = cfa * G4float(7.716) * std::exp(-G4double(cfa)); |
---|
693 | atno3 = targetAtomicMass; |
---|
694 | if (atno3 > G4float(120.)) { |
---|
695 | atno3 = G4float(120.); |
---|
696 | } |
---|
697 | cfa = (atno3 - G4float(1.)) / |
---|
698 | G4float(120.) * std::exp(-G4double(atno3 - G4float(1.)) / G4float(120.)); |
---|
699 | ret_val *= cfa; |
---|
700 | r__1 = ekin1; |
---|
701 | fpdiv = G4float(1.) - r__1 * r__1 * G4float(.25); |
---|
702 | if (fpdiv < G4float(.5)) { |
---|
703 | fpdiv = G4float(.5); |
---|
704 | } |
---|
705 | gfa = (targetAtomicMass - G4float(1.)) / |
---|
706 | G4float(70.) * G4float(2.) * |
---|
707 | std::exp(-G4double(targetAtomicMass - G4float(1.)) / G4float(70.)); |
---|
708 | evapEnergy1 = ret_val * fpdiv; |
---|
709 | evapEnergy3 = ret_val - evapEnergy1; |
---|
710 | Normal(&ran1); |
---|
711 | Normal(&ran2); |
---|
712 | if (magic == 1) { |
---|
713 | ran1 = G4float(0.); |
---|
714 | ran2 = G4float(0.); |
---|
715 | } |
---|
716 | evapEnergy1 *= ran1 * gfa + G4float(1.); |
---|
717 | if (evapEnergy1 < G4float(0.)) { |
---|
718 | evapEnergy1 = G4float(0.); |
---|
719 | } |
---|
720 | evapEnergy3 *= ran2 * gfa + G4float(1.); |
---|
721 | if (evapEnergy3 < G4float(0.)) { |
---|
722 | evapEnergy3 = G4float(0.); |
---|
723 | } |
---|
724 | while ((ret_val = evapEnergy1 + evapEnergy3) >= ek1) { |
---|
725 | evapEnergy1 *= G4float(1.) - G4UniformRand() * G4float(.5); |
---|
726 | evapEnergy3 *= G4float(1.) - G4UniformRand() * G4float(.5); |
---|
727 | } |
---|
728 | } |
---|
729 | return ret_val; |
---|
730 | |
---|
731 | } // ExNu |
---|