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 | // |
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28 | // Hadronic Process: Reaction Dynamics |
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29 | // original by H.P. Wellisch |
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30 | // modified by J.L. Chuma, TRIUMF, 19-Nov-1996 |
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31 | // Last modified: 27-Mar-1997 |
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32 | // modified by H.P. Wellisch, 24-Apr-97 |
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33 | // H.P. Wellisch, 25.Apr-97: Side of current and target particle taken into account |
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34 | // H.P. Wellisch, 29.Apr-97: Bug fix in NuclearReaction. (pseudo1 was without energy) |
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35 | // J.L. Chuma, 30-Apr-97: Changed return value for GenerateXandPt. It seems possible |
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36 | // that GenerateXandPt could eliminate some secondaries, but |
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37 | // still finish its calculations, thus we would not want to |
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38 | // then use TwoCluster to again calculate the momenta if vecLen |
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39 | // was less than 6. |
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40 | // J.L. Chuma, 10-Jun-97: Modified NuclearReaction. Was not creating ReactionProduct's |
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41 | // with the new operator, thus they would be meaningless when |
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42 | // going out of scope. |
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43 | // J.L. Chuma, 20-Jun-97: Modified GenerateXandPt and TwoCluster to fix units problems |
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44 | // J.L. Chuma, 23-Jun-97: Modified ProduceStrangeParticlePairs to fix units problems |
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45 | // J.L. Chuma, 26-Jun-97: Modified ProduceStrangeParticlePairs to fix array indices |
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46 | // which were sometimes going out of bounds |
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47 | // J.L. Chuma, 04-Jul-97: Many minor modifications to GenerateXandPt and TwoCluster |
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48 | // J.L. Chuma, 06-Aug-97: Added original incident particle, before Fermi motion and |
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49 | // evaporation effects are included, needed for self absorption |
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50 | // and corrections for single particle spectra (shower particles) |
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51 | // logging stopped 1997 |
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52 | // J. Allison, 17-Jun-99: Replaced a min function to get correct behaviour on DEC. |
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53 | |
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54 | #include "G4ReactionDynamics.hh" |
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55 | #include "G4AntiProton.hh" |
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56 | #include "G4AntiNeutron.hh" |
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57 | #include "Randomize.hh" |
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58 | #include <iostream> |
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59 | #include "G4HadReentrentException.hh" |
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60 | #include <signal.h> |
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61 | |
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62 | // #include "DumpFrame.hh" |
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63 | |
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64 | /* G4double GetQValue(G4ReactionProduct * aSec) |
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65 | { |
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66 | double QValue=0; |
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67 | if(aSec->GetDefinition()->GetParticleType() == "baryon") |
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68 | { |
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69 | if(aSec->GetDefinition()->GetBaryonNumber() < 0) |
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70 | { |
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71 | QValue = aSec->GetTotalEnergy(); |
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72 | QValue += G4Neutron::Neutron()->GetPDGMass(); |
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73 | } |
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74 | else |
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75 | { |
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76 | G4double ss = 0; |
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77 | ss +=aSec->GetDefinition()->GetPDGMass(); |
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78 | if(aSec->GetDefinition() == G4Proton::Proton()) |
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79 | { |
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80 | ss -=G4Proton::Proton()->GetPDGMass(); |
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81 | } |
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82 | else |
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83 | { |
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84 | ss -=G4Neutron::Neutron()->GetPDGMass(); |
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85 | } |
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86 | ss += aSec->GetKineticEnergy(); |
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87 | QValue = ss; |
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88 | } |
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89 | } |
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90 | else if(aSec->GetDefinition()->GetPDGEncoding() == 0) |
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91 | { |
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92 | QValue = aSec->GetKineticEnergy(); |
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93 | } |
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94 | else |
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95 | { |
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96 | QValue = aSec->GetTotalEnergy(); |
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97 | } |
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98 | return QValue; |
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99 | } |
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100 | */ |
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101 | |
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102 | G4bool G4ReactionDynamics::GenerateXandPt( |
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103 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> &vec, |
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104 | G4int &vecLen, |
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105 | G4ReactionProduct &modifiedOriginal, // Fermi motion & evap. effects included |
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106 | const G4HadProjectile *originalIncident, // the original incident particle |
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107 | G4ReactionProduct ¤tParticle, |
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108 | G4ReactionProduct &targetParticle, |
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109 | const G4DynamicParticle* originalTarget, |
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110 | const G4Nucleus &targetNucleus, |
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111 | G4bool &incidentHasChanged, |
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112 | G4bool &targetHasChanged, |
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113 | G4bool leadFlag, |
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114 | G4ReactionProduct &leadingStrangeParticle ) |
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115 | { |
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116 | // |
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117 | // derived from original FORTRAN code GENXPT by H. Fesefeldt (11-Oct-1987) |
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118 | // |
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119 | // Generation of X- and PT- values for incident, target, and all secondary particles |
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120 | // A simple single variable description E D3S/DP3= F(Q) with |
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121 | // Q^2 = (M*X)^2 + PT^2 is used. Final state kinematic is produced |
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122 | // by an FF-type iterative cascade method |
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123 | // |
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124 | // internal units are GeV |
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125 | // |
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126 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
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127 | |
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128 | // Protection in case no secondary has been created; cascades down to two-body. |
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129 | if(vecLen == 0) return false; |
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130 | |
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131 | G4ParticleDefinition *aPiMinus = G4PionMinus::PionMinus(); |
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132 | G4ParticleDefinition *aProton = G4Proton::Proton(); |
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133 | G4ParticleDefinition *aNeutron = G4Neutron::Neutron(); |
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134 | G4ParticleDefinition *aPiPlus = G4PionPlus::PionPlus(); |
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135 | G4ParticleDefinition *aPiZero = G4PionZero::PionZero(); |
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136 | |
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137 | G4int i, l; |
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138 | G4bool veryForward = false; |
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139 | |
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140 | const G4double ekOriginal = modifiedOriginal.GetKineticEnergy()/GeV; |
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141 | const G4double etOriginal = modifiedOriginal.GetTotalEnergy()/GeV; |
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142 | const G4double mOriginal = modifiedOriginal.GetMass()/GeV; |
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143 | const G4double pOriginal = modifiedOriginal.GetMomentum().mag()/GeV; |
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144 | G4double targetMass = targetParticle.GetDefinition()->GetPDGMass()/GeV; |
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145 | G4double centerofmassEnergy = std::sqrt( mOriginal*mOriginal + |
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146 | targetMass*targetMass + |
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147 | 2.0*targetMass*etOriginal ); // GeV |
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148 | G4double currentMass = currentParticle.GetMass()/GeV; |
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149 | targetMass = targetParticle.GetMass()/GeV; |
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150 | // |
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151 | // randomize the order of the secondary particles |
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152 | // note that the current and target particles are not affected |
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153 | // |
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154 | for( i=0; i<vecLen; ++i ) |
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155 | { |
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156 | G4int itemp = G4int( G4UniformRand()*vecLen ); |
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157 | G4ReactionProduct pTemp = *vec[itemp]; |
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158 | *vec[itemp] = *vec[i]; |
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159 | *vec[i] = pTemp; |
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160 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
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161 | } |
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162 | |
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163 | if( currentMass == 0.0 && targetMass == 0.0 ) |
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164 | { |
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165 | // Target and projectile have annihilated. Replace them with the first |
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166 | // two secondaries in the list. Current particle KE is maintained. |
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167 | |
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168 | G4double ek = currentParticle.GetKineticEnergy(); |
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169 | G4ThreeVector m = currentParticle.GetMomentum(); |
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170 | currentParticle = *vec[0]; |
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171 | targetParticle = *vec[1]; |
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172 | for( i=0; i<(vecLen-2); ++i )*vec[i] = *vec[i+2]; |
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173 | G4ReactionProduct *temp = vec[vecLen-1]; |
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174 | delete temp; |
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175 | temp = vec[vecLen-2]; |
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176 | delete temp; |
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177 | vecLen -= 2; |
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178 | currentMass = currentParticle.GetMass()/GeV; |
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179 | targetMass = targetParticle.GetMass()/GeV; |
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180 | incidentHasChanged = true; |
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181 | targetHasChanged = true; |
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182 | currentParticle.SetKineticEnergy( ek ); |
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183 | currentParticle.SetMomentum( m ); |
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184 | veryForward = true; |
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185 | } |
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186 | const G4double atomicWeight = G4double(targetNucleus.GetA_asInt()); |
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187 | const G4double atomicNumber = G4double(targetNucleus.GetZ_asInt()); |
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188 | const G4double protonMass = aProton->GetPDGMass()/MeV; |
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189 | |
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190 | if (originalIncident->GetDefinition()->GetParticleSubType() == "kaon" |
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191 | && G4UniformRand() >= 0.7) { |
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192 | G4ReactionProduct temp = currentParticle; |
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193 | currentParticle = targetParticle; |
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194 | targetParticle = temp; |
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195 | incidentHasChanged = true; |
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196 | targetHasChanged = true; |
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197 | currentMass = currentParticle.GetMass()/GeV; |
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198 | targetMass = targetParticle.GetMass()/GeV; |
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199 | } |
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200 | const G4double afc = std::min( 0.75, |
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201 | 0.312+0.200*std::log(std::log(centerofmassEnergy*centerofmassEnergy))+ |
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202 | std::pow(centerofmassEnergy*centerofmassEnergy,1.5)/6000.0 ); |
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203 | |
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204 | G4double freeEnergy = centerofmassEnergy-currentMass-targetMass; |
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205 | G4double forwardEnergy = freeEnergy/2.; |
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206 | G4int forwardCount = 1; // number of particles in forward hemisphere |
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207 | |
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208 | G4double backwardEnergy = freeEnergy/2.; |
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209 | G4int backwardCount = 1; // number of particles in backward hemisphere |
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210 | |
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211 | if(veryForward) |
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212 | { |
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213 | if(currentParticle.GetSide()==-1) |
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214 | { |
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215 | forwardEnergy += currentMass; |
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216 | forwardCount --; |
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217 | backwardEnergy -= currentMass; |
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218 | backwardCount ++; |
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219 | } |
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220 | if(targetParticle.GetSide()!=-1) |
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221 | { |
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222 | backwardEnergy += targetMass; |
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223 | backwardCount --; |
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224 | forwardEnergy -= targetMass; |
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225 | forwardCount ++; |
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226 | } |
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227 | } |
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228 | |
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229 | for( i=0; i<vecLen; ++i ) |
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230 | { |
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231 | if( vec[i]->GetSide() == -1 ) |
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232 | { |
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233 | ++backwardCount; |
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234 | backwardEnergy -= vec[i]->GetMass()/GeV; |
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235 | } else { |
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236 | ++forwardCount; |
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237 | forwardEnergy -= vec[i]->GetMass()/GeV; |
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238 | } |
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239 | } |
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240 | // |
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241 | // Add particles from intranuclear cascade. |
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242 | // nuclearExcitationCount = number of new secondaries produced by nuclear excitation |
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243 | // extraCount = number of nucleons within these new secondaries |
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244 | // |
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245 | G4double xtarg; |
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246 | if( centerofmassEnergy < (2.0+G4UniformRand()) ) |
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247 | xtarg = afc * (std::pow(atomicWeight,0.33)-1.0) * (2.0*backwardCount+vecLen+2)/2.0; |
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248 | else |
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249 | xtarg = afc * (std::pow(atomicWeight,0.33)-1.0) * (2.0*backwardCount); |
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250 | if( xtarg <= 0.0 )xtarg = 0.01; |
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251 | G4int nuclearExcitationCount = Poisson( xtarg ); |
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252 | if(atomicWeight<1.0001) nuclearExcitationCount = 0; |
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253 | G4int extraNucleonCount = 0; |
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254 | G4double extraNucleonMass = 0.0; |
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255 | if( nuclearExcitationCount > 0 ) |
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256 | { |
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257 | const G4double nucsup[] = { 1.00, 0.7, 0.5, 0.4, 0.35, 0.3 }; |
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258 | const G4double psup[] = { 3., 6., 20., 50., 100., 1000. }; |
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259 | G4int momentumBin = 0; |
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260 | while( (momentumBin < 6) && |
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261 | (modifiedOriginal.GetTotalMomentum()/GeV > psup[momentumBin]) ) |
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262 | ++momentumBin; |
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263 | momentumBin = std::min( 5, momentumBin ); |
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264 | // |
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265 | // NOTE: in GENXPT, these new particles were given negative codes |
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266 | // here I use NewlyAdded = true instead |
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267 | // |
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268 | |
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269 | for( i=0; i<nuclearExcitationCount; ++i ) |
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270 | { |
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271 | G4ReactionProduct * pVec = new G4ReactionProduct(); |
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272 | if( G4UniformRand() < nucsup[momentumBin] ) |
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273 | { |
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274 | if( G4UniformRand() > 1.0-atomicNumber/atomicWeight ) |
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275 | pVec->SetDefinition( aProton ); |
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276 | else |
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277 | pVec->SetDefinition( aNeutron ); |
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278 | pVec->SetSide( -2 ); // -2 means backside nucleon |
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279 | ++extraNucleonCount; |
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280 | backwardEnergy += pVec->GetMass()/GeV; |
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281 | extraNucleonMass += pVec->GetMass()/GeV; |
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282 | } |
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283 | else |
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284 | { |
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285 | G4double ran = G4UniformRand(); |
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286 | if( ran < 0.3181 ) |
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287 | pVec->SetDefinition( aPiPlus ); |
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288 | else if( ran < 0.6819 ) |
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289 | pVec->SetDefinition( aPiZero ); |
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290 | else |
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291 | pVec->SetDefinition( aPiMinus ); |
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292 | pVec->SetSide( -1 ); // backside particle, but not a nucleon |
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293 | } |
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294 | pVec->SetNewlyAdded( true ); // true is the same as IPA(i)<0 |
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295 | vec.SetElement( vecLen++, pVec ); |
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296 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
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297 | backwardEnergy -= pVec->GetMass()/GeV; |
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298 | ++backwardCount; |
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299 | } |
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300 | } |
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301 | // |
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302 | // assume conservation of kinetic energy in forward & backward hemispheres |
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303 | // |
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304 | G4int is, iskip; |
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305 | while( forwardEnergy <= 0.0 ) // must eliminate a particle from the forward side |
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306 | { |
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307 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
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308 | iskip = G4int(G4UniformRand()*forwardCount) + 1; // 1 <= iskip <= forwardCount |
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309 | is = 0; |
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310 | G4int forwardParticlesLeft = 0; |
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311 | for( i=(vecLen-1); i>=0; --i ) |
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312 | { |
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313 | if( vec[i]->GetSide() == 1 && vec[i]->GetMayBeKilled()) |
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314 | { |
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315 | forwardParticlesLeft = 1; |
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316 | if( ++is == iskip ) |
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317 | { |
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318 | forwardEnergy += vec[i]->GetMass()/GeV; |
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319 | for( G4int j=i; j<(vecLen-1); j++ )*vec[j] = *vec[j+1]; // shift up |
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320 | --forwardCount; |
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321 | delete vec[vecLen-1]; |
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322 | if( --vecLen == 0 )return false; // all the secondaries have been eliminated |
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323 | break; // --+ |
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324 | } // | |
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325 | } // | |
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326 | } // break goes down to here |
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327 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
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328 | if( forwardParticlesLeft == 0 ) |
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329 | { |
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330 | G4int iremove = -1; |
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331 | for (G4int i = 0; i < vecLen; i++) { |
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332 | if (vec[i]->GetDefinition()->GetParticleSubType() == "pi") { |
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333 | iremove = i; |
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334 | break; |
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335 | } |
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336 | } |
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337 | if (iremove == -1) { |
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338 | for (G4int i = 0; i < vecLen; i++) { |
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339 | if (vec[i]->GetDefinition()->GetParticleSubType() == "kaon") { |
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340 | iremove = i; |
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341 | break; |
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342 | } |
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343 | } |
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344 | } |
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345 | if (iremove == -1) iremove = 0; |
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346 | |
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347 | forwardEnergy += vec[iremove]->GetMass()/GeV; |
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348 | if (vec[iremove]->GetSide() > 0) --forwardCount; |
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349 | |
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350 | for (G4int i = iremove; i < vecLen-1; i++) *vec[i] = *vec[i+1]; |
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351 | delete vec[vecLen-1]; |
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352 | vecLen--; |
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353 | if (vecLen == 0) return false; // all secondaries have been eliminated |
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354 | break; |
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355 | } |
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356 | } // while |
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357 | |
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358 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
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359 | while( backwardEnergy <= 0.0 ) // must eliminate a particle from the backward side |
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360 | { |
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361 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
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362 | iskip = G4int(G4UniformRand()*backwardCount) + 1; // 1 <= iskip <= backwardCount |
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363 | is = 0; |
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364 | G4int backwardParticlesLeft = 0; |
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365 | for( i=(vecLen-1); i>=0; --i ) |
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366 | { |
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367 | if( vec[i]->GetSide() < 0 && vec[i]->GetMayBeKilled()) |
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368 | { |
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369 | backwardParticlesLeft = 1; |
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370 | if( ++is == iskip ) // eliminate the i'th particle |
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371 | { |
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372 | if( vec[i]->GetSide() == -2 ) |
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373 | { |
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374 | --extraNucleonCount; |
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375 | extraNucleonMass -= vec[i]->GetMass()/GeV; |
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376 | backwardEnergy -= vec[i]->GetTotalEnergy()/GeV; |
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377 | } |
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378 | backwardEnergy += vec[i]->GetTotalEnergy()/GeV; |
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379 | for( G4int j=i; j<(vecLen-1); ++j )*vec[j] = *vec[j+1]; // shift up |
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380 | --backwardCount; |
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381 | delete vec[vecLen-1]; |
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382 | if( --vecLen == 0 )return false; // all the secondaries have been eliminated |
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383 | break; |
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384 | } |
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385 | } |
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386 | } |
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387 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
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388 | if( backwardParticlesLeft == 0 ) |
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389 | { |
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390 | G4int iremove = -1; |
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391 | for (G4int i = 0; i < vecLen; i++) { |
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392 | if (vec[i]->GetDefinition()->GetParticleSubType() == "pi") { |
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393 | iremove = i; |
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394 | break; |
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395 | } |
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396 | } |
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397 | if (iremove == -1) { |
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398 | for (G4int i = 0; i < vecLen; i++) { |
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399 | if (vec[i]->GetDefinition()->GetParticleSubType() == "kaon") { |
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400 | iremove = i; |
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401 | break; |
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402 | } |
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403 | } |
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404 | } |
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405 | if (iremove == -1) iremove = 0; |
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406 | |
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407 | backwardEnergy += vec[iremove]->GetMass()/GeV; |
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408 | if (vec[iremove]->GetSide() > 0) --backwardCount; |
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409 | |
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410 | for (G4int i = iremove; i < vecLen-1; i++) *vec[i] = *vec[i+1]; |
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411 | delete vec[vecLen-1]; |
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412 | vecLen--; |
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413 | if (vecLen == 0) return false; // all secondaries have been eliminated |
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414 | break; |
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415 | } |
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416 | } // while |
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417 | |
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418 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
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419 | // |
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420 | // define initial state vectors for Lorentz transformations |
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421 | // the pseudoParticles have non-standard masses, hence the "pseudo" |
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422 | // |
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423 | G4ReactionProduct pseudoParticle[10]; |
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424 | for( i=0; i<10; ++i )pseudoParticle[i].SetZero(); |
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425 | |
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426 | pseudoParticle[0].SetMass( mOriginal*GeV ); |
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427 | pseudoParticle[0].SetMomentum( 0.0, 0.0, pOriginal*GeV ); |
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428 | pseudoParticle[0].SetTotalEnergy( |
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429 | std::sqrt( pOriginal*pOriginal + mOriginal*mOriginal )*GeV ); |
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430 | |
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431 | pseudoParticle[1].SetMass( protonMass*MeV ); // this could be targetMass |
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432 | pseudoParticle[1].SetTotalEnergy( protonMass*MeV ); |
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433 | |
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434 | pseudoParticle[3].SetMass( protonMass*(1+extraNucleonCount)*MeV ); |
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435 | pseudoParticle[3].SetTotalEnergy( protonMass*(1+extraNucleonCount)*MeV ); |
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436 | |
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437 | pseudoParticle[8].SetMomentum( 1.0*GeV, 0.0, 0.0 ); |
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438 | |
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439 | pseudoParticle[2] = pseudoParticle[0] + pseudoParticle[1]; |
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440 | pseudoParticle[3] = pseudoParticle[3] + pseudoParticle[0]; |
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441 | |
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442 | pseudoParticle[0].Lorentz( pseudoParticle[0], pseudoParticle[2] ); |
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443 | pseudoParticle[1].Lorentz( pseudoParticle[1], pseudoParticle[2] ); |
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444 | |
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445 | G4double dndl[20]; |
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446 | // |
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447 | // main loop for 4-momentum generation |
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448 | // see Pitha-report (Aachen) for a detailed description of the method |
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449 | // |
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450 | G4double aspar, pt, et, x, pp, pp1, rmb, wgt; |
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451 | G4int innerCounter, outerCounter; |
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452 | G4bool eliminateThisParticle, resetEnergies, constantCrossSection; |
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453 | |
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454 | G4double forwardKinetic = 0.0, backwardKinetic = 0.0; |
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455 | // |
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456 | // process the secondary particles in reverse order |
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457 | // the incident particle is Done after the secondaries |
---|
458 | // nucleons, including the target, in the backward hemisphere are also Done later |
---|
459 | // |
---|
460 | G4double binl[20] = {0.,0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9,1.0,1.11,1.25, |
---|
461 | 1.43,1.67,2.0,2.5,3.33,5.00,10.00}; |
---|
462 | G4int backwardNucleonCount = 0; // number of nucleons in backward hemisphere |
---|
463 | G4double totalEnergy, kineticEnergy, vecMass; |
---|
464 | |
---|
465 | for( i=(vecLen-1); i>=0; --i ) |
---|
466 | { |
---|
467 | G4double phi = G4UniformRand()*twopi; |
---|
468 | if( vec[i]->GetNewlyAdded() ) // added from intranuclear cascade |
---|
469 | { |
---|
470 | if( vec[i]->GetSide() == -2 ) // is a nucleon |
---|
471 | { |
---|
472 | if( backwardNucleonCount < 18 ) |
---|
473 | { |
---|
474 | if (vec[i]->GetDefinition()->GetParticleSubType() == "pi") { |
---|
475 | for(G4int i=0; i<vecLen; i++) delete vec[i]; |
---|
476 | vecLen = 0; |
---|
477 | throw G4HadReentrentException(__FILE__, __LINE__, |
---|
478 | "G4ReactionDynamics::GenerateXandPt : a pion has been counted as a backward nucleon"); |
---|
479 | } |
---|
480 | vec[i]->SetSide( -3 ); |
---|
481 | ++backwardNucleonCount; |
---|
482 | continue; |
---|
483 | } |
---|
484 | } |
---|
485 | } |
---|
486 | // |
---|
487 | // set pt and phi values, they are changed somewhat in the iteration loop |
---|
488 | // set mass parameter for lambda fragmentation model |
---|
489 | // |
---|
490 | vecMass = vec[i]->GetMass()/GeV; |
---|
491 | G4double ran = -std::log(1.0-G4UniformRand())/3.5; |
---|
492 | if( vec[i]->GetSide() == -2 ) // backward nucleon |
---|
493 | { |
---|
494 | if (vec[i]->GetDefinition()->GetParticleSubType() == "kaon" || |
---|
495 | vec[i]->GetDefinition()->GetParticleSubType() == "pi") { |
---|
496 | aspar = 0.75; |
---|
497 | pt = std::sqrt( std::pow( ran, 1.7 ) ); |
---|
498 | } else { // vec[i] must be a proton, neutron, |
---|
499 | aspar = 0.20; // lambda, sigma, xsi, or ion |
---|
500 | pt = std::sqrt( std::pow( ran, 1.2 ) ); |
---|
501 | } |
---|
502 | |
---|
503 | } else { // not a backward nucleon |
---|
504 | |
---|
505 | if (vec[i]->GetDefinition()->GetParticleSubType() == "pi") { |
---|
506 | aspar = 0.75; |
---|
507 | pt = std::sqrt( std::pow( ran, 1.7 ) ); |
---|
508 | } else if (vec[i]->GetDefinition()->GetParticleSubType() == "kaon") { |
---|
509 | aspar = 0.70; |
---|
510 | pt = std::sqrt( std::pow( ran, 1.7 ) ); |
---|
511 | } else { // vec[i] must be a proton, neutron, |
---|
512 | aspar = 0.65; // lambda, sigma, xsi, or ion |
---|
513 | pt = std::sqrt( std::pow( ran, 1.5 ) ); |
---|
514 | } |
---|
515 | } |
---|
516 | pt = std::max( 0.001, pt ); |
---|
517 | vec[i]->SetMomentum( pt*std::cos(phi)*GeV, pt*std::sin(phi)*GeV ); |
---|
518 | for( G4int j=0; j<20; ++j )binl[j] = j/(19.*pt); |
---|
519 | if( vec[i]->GetSide() > 0 ) |
---|
520 | et = pseudoParticle[0].GetTotalEnergy()/GeV; |
---|
521 | else |
---|
522 | et = pseudoParticle[1].GetTotalEnergy()/GeV; |
---|
523 | dndl[0] = 0.0; |
---|
524 | // |
---|
525 | // start of outer iteration loop |
---|
526 | // |
---|
527 | outerCounter = 0; |
---|
528 | eliminateThisParticle = true; |
---|
529 | resetEnergies = true; |
---|
530 | while( ++outerCounter < 3 ) |
---|
531 | { |
---|
532 | for( l=1; l<20; ++l ) |
---|
533 | { |
---|
534 | x = (binl[l]+binl[l-1])/2.; |
---|
535 | pt = std::max( 0.001, pt ); |
---|
536 | if( x > 1.0/pt ) |
---|
537 | dndl[l] += dndl[l-1]; // changed from just = on 02 April 98 |
---|
538 | else |
---|
539 | dndl[l] = et * aspar/std::sqrt( std::pow((1.+aspar*x*aspar*x),3) ) |
---|
540 | * (binl[l]-binl[l-1]) / std::sqrt( pt*x*et*pt*x*et + pt*pt + vecMass*vecMass ) |
---|
541 | + dndl[l-1]; |
---|
542 | } |
---|
543 | innerCounter = 0; |
---|
544 | vec[i]->SetMomentum( pt*std::cos(phi)*GeV, pt*std::sin(phi)*GeV ); |
---|
545 | // |
---|
546 | // start of inner iteration loop |
---|
547 | // |
---|
548 | while( ++innerCounter < 7 ) |
---|
549 | { |
---|
550 | ran = G4UniformRand()*dndl[19]; |
---|
551 | l = 1; |
---|
552 | while( ( ran >= dndl[l] ) && ( l < 20 ) )l++; |
---|
553 | l = std::min( 19, l ); |
---|
554 | x = std::min( 1.0, pt*(binl[l-1] + G4UniformRand()*(binl[l]-binl[l-1]) ) ); |
---|
555 | if( vec[i]->GetSide() < 0 )x *= -1.; |
---|
556 | vec[i]->SetMomentum( x*et*GeV ); // set the z-momentum |
---|
557 | totalEnergy = std::sqrt( x*et*x*et + pt*pt + vecMass*vecMass ); |
---|
558 | vec[i]->SetTotalEnergy( totalEnergy*GeV ); |
---|
559 | kineticEnergy = vec[i]->GetKineticEnergy()/GeV; |
---|
560 | if( vec[i]->GetSide() > 0 ) // forward side |
---|
561 | { |
---|
562 | if( (forwardKinetic+kineticEnergy) < 0.95*forwardEnergy ) |
---|
563 | { |
---|
564 | pseudoParticle[4] = pseudoParticle[4] + (*vec[i]); |
---|
565 | forwardKinetic += kineticEnergy; |
---|
566 | pseudoParticle[6] = pseudoParticle[4] + pseudoParticle[5]; |
---|
567 | pseudoParticle[6].SetMomentum( 0.0 ); // set the z-momentum |
---|
568 | phi = pseudoParticle[6].Angle( pseudoParticle[8] ); |
---|
569 | if( pseudoParticle[6].GetMomentum().y()/MeV < 0.0 )phi = twopi - phi; |
---|
570 | phi += pi + normal()*pi/12.0; |
---|
571 | if( phi > twopi )phi -= twopi; |
---|
572 | if( phi < 0.0 )phi = twopi - phi; |
---|
573 | outerCounter = 2; // leave outer loop |
---|
574 | eliminateThisParticle = false; // don't eliminate this particle |
---|
575 | resetEnergies = false; |
---|
576 | break; // leave inner loop |
---|
577 | } |
---|
578 | if( innerCounter > 5 )break; // leave inner loop |
---|
579 | if( backwardEnergy >= vecMass ) // switch sides |
---|
580 | { |
---|
581 | vec[i]->SetSide( -1 ); |
---|
582 | forwardEnergy += vecMass; |
---|
583 | backwardEnergy -= vecMass; |
---|
584 | ++backwardCount; |
---|
585 | } |
---|
586 | } else { // backward side |
---|
587 | if( extraNucleonCount > 19 ) // commented out to duplicate ?bug? in GENXPT |
---|
588 | x = 0.999; |
---|
589 | G4double xxx = 0.95+0.05*extraNucleonCount/20.0; |
---|
590 | if( (backwardKinetic+kineticEnergy) < xxx*backwardEnergy ) |
---|
591 | { |
---|
592 | pseudoParticle[5] = pseudoParticle[5] + (*vec[i]); |
---|
593 | backwardKinetic += kineticEnergy; |
---|
594 | pseudoParticle[6] = pseudoParticle[4] + pseudoParticle[5]; |
---|
595 | pseudoParticle[6].SetMomentum( 0.0 ); // set the z-momentum |
---|
596 | phi = pseudoParticle[6].Angle( pseudoParticle[8] ); |
---|
597 | if( pseudoParticle[6].GetMomentum().y()/MeV < 0.0 )phi = twopi - phi; |
---|
598 | phi += pi + normal() * pi / 12.0; |
---|
599 | if( phi > twopi )phi -= twopi; |
---|
600 | if( phi < 0.0 )phi = twopi - phi; |
---|
601 | outerCounter = 2; // leave outer loop |
---|
602 | eliminateThisParticle = false; // don't eliminate this particle |
---|
603 | resetEnergies = false; |
---|
604 | break; // leave inner loop |
---|
605 | } |
---|
606 | if( innerCounter > 5 )break; // leave inner loop |
---|
607 | if( forwardEnergy >= vecMass ) // switch sides |
---|
608 | { |
---|
609 | vec[i]->SetSide( 1 ); |
---|
610 | forwardEnergy -= vecMass; |
---|
611 | backwardEnergy += vecMass; |
---|
612 | backwardCount--; |
---|
613 | } |
---|
614 | } |
---|
615 | G4ThreeVector momentum = vec[i]->GetMomentum(); |
---|
616 | vec[i]->SetMomentum( momentum.x() * 0.9, momentum.y() * 0.9 ); |
---|
617 | pt *= 0.9; |
---|
618 | dndl[19] *= 0.9; |
---|
619 | } // closes inner loop |
---|
620 | if( resetEnergies ) |
---|
621 | { |
---|
622 | // if we get to here, the inner loop has been Done 6 Times |
---|
623 | // reset the kinetic energies of previously Done particles, if they are lighter |
---|
624 | // than protons and in the forward hemisphere |
---|
625 | // then continue with outer loop |
---|
626 | // |
---|
627 | forwardKinetic = 0.0; |
---|
628 | backwardKinetic = 0.0; |
---|
629 | pseudoParticle[4].SetZero(); |
---|
630 | pseudoParticle[5].SetZero(); |
---|
631 | for( l=i+1; l<vecLen; ++l ) |
---|
632 | { |
---|
633 | if (vec[l]->GetSide() > 0 || |
---|
634 | vec[l]->GetDefinition()->GetParticleSubType() == "kaon" || |
---|
635 | vec[l]->GetDefinition()->GetParticleSubType() == "pi") { |
---|
636 | |
---|
637 | G4double tempMass = vec[l]->GetMass()/MeV; |
---|
638 | totalEnergy = 0.95*vec[l]->GetTotalEnergy()/MeV + 0.05*tempMass; |
---|
639 | totalEnergy = std::max( tempMass, totalEnergy ); |
---|
640 | vec[l]->SetTotalEnergy( totalEnergy*MeV ); |
---|
641 | pp = std::sqrt( std::abs( totalEnergy*totalEnergy - tempMass*tempMass ) ); |
---|
642 | pp1 = vec[l]->GetMomentum().mag()/MeV; |
---|
643 | if( pp1 < 1.0e-6*GeV ) |
---|
644 | { |
---|
645 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
646 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
647 | G4double phi = twopi*G4UniformRand(); |
---|
648 | vec[l]->SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
649 | pp*sintheta*std::sin(phi)*MeV, |
---|
650 | pp*costheta*MeV ) ; |
---|
651 | } else { |
---|
652 | vec[l]->SetMomentum( vec[l]->GetMomentum() * (pp/pp1) ); |
---|
653 | } |
---|
654 | G4double px = vec[l]->GetMomentum().x()/MeV; |
---|
655 | G4double py = vec[l]->GetMomentum().y()/MeV; |
---|
656 | pt = std::max( 1.0, std::sqrt( px*px + py*py ) )/GeV; |
---|
657 | if( vec[l]->GetSide() > 0 ) |
---|
658 | { |
---|
659 | forwardKinetic += vec[l]->GetKineticEnergy()/GeV; |
---|
660 | pseudoParticle[4] = pseudoParticle[4] + (*vec[l]); |
---|
661 | } else { |
---|
662 | backwardKinetic += vec[l]->GetKineticEnergy()/GeV; |
---|
663 | pseudoParticle[5] = pseudoParticle[5] + (*vec[l]); |
---|
664 | } |
---|
665 | } // if pi, K or forward |
---|
666 | } // for l |
---|
667 | } // if resetEnergies |
---|
668 | } // closes outer loop |
---|
669 | |
---|
670 | if( eliminateThisParticle && vec[i]->GetMayBeKilled()) // not enough energy, eliminate this particle |
---|
671 | { |
---|
672 | if( vec[i]->GetSide() > 0 ) |
---|
673 | { |
---|
674 | --forwardCount; |
---|
675 | forwardEnergy += vecMass; |
---|
676 | } else { |
---|
677 | if( vec[i]->GetSide() == -2 ) |
---|
678 | { |
---|
679 | --extraNucleonCount; |
---|
680 | extraNucleonMass -= vecMass; |
---|
681 | backwardEnergy -= vecMass; |
---|
682 | } |
---|
683 | --backwardCount; |
---|
684 | backwardEnergy += vecMass; |
---|
685 | } |
---|
686 | for( G4int j=i; j<(vecLen-1); ++j )*vec[j] = *vec[j+1]; // shift up |
---|
687 | G4ReactionProduct *temp = vec[vecLen-1]; |
---|
688 | delete temp; |
---|
689 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
690 | if( --vecLen == 0 )return false; // all the secondaries have been eliminated |
---|
691 | pseudoParticle[6] = pseudoParticle[4] + pseudoParticle[5]; |
---|
692 | pseudoParticle[6].SetMomentum( 0.0 ); // set z-momentum |
---|
693 | phi = pseudoParticle[6].Angle( pseudoParticle[8] ); |
---|
694 | if( pseudoParticle[6].GetMomentum().y()/MeV < 0.0 )phi = twopi - phi; |
---|
695 | phi += pi + normal() * pi / 12.0; |
---|
696 | if( phi > twopi )phi -= twopi; |
---|
697 | if( phi < 0.0 )phi = twopi - phi; |
---|
698 | } |
---|
699 | } // closes main for loop |
---|
700 | |
---|
701 | // |
---|
702 | // for the incident particle: it was placed in the forward hemisphere |
---|
703 | // set pt and phi values, they are changed somewhat in the iteration loop |
---|
704 | // set mass parameter for lambda fragmentation model |
---|
705 | // |
---|
706 | G4double phi = G4UniformRand()*twopi; |
---|
707 | G4double ran = -std::log(1.0-G4UniformRand()); |
---|
708 | if (currentParticle.GetDefinition()->GetParticleSubType() == "pi") { |
---|
709 | aspar = 0.60; |
---|
710 | pt = std::sqrt( std::pow( ran/6.0, 1.7 ) ); |
---|
711 | } else if (currentParticle.GetDefinition()->GetParticleSubType() == "kaon") { |
---|
712 | aspar = 0.50; |
---|
713 | pt = std::sqrt( std::pow( ran/5.0, 1.4 ) ); |
---|
714 | } else { |
---|
715 | aspar = 0.40; |
---|
716 | pt = std::sqrt( std::pow( ran/4.0, 1.2 ) ); |
---|
717 | } |
---|
718 | |
---|
719 | for( G4int j=0; j<20; ++j )binl[j] = j/(19.*pt); |
---|
720 | currentParticle.SetMomentum( pt*std::cos(phi)*GeV, pt*std::sin(phi)*GeV ); |
---|
721 | et = pseudoParticle[0].GetTotalEnergy()/GeV; |
---|
722 | dndl[0] = 0.0; |
---|
723 | vecMass = currentParticle.GetMass()/GeV; |
---|
724 | for( l=1; l<20; ++l ) |
---|
725 | { |
---|
726 | x = (binl[l]+binl[l-1])/2.; |
---|
727 | if( x > 1.0/pt ) |
---|
728 | dndl[l] += dndl[l-1]; // changed from just = on 02 April 98 |
---|
729 | else |
---|
730 | dndl[l] = aspar/std::sqrt( std::pow((1.+sqr(aspar*x)),3) ) * |
---|
731 | (binl[l]-binl[l-1]) * et / std::sqrt( pt*x*et*pt*x*et + pt*pt + vecMass*vecMass ) + |
---|
732 | dndl[l-1]; |
---|
733 | } |
---|
734 | ran = G4UniformRand()*dndl[19]; |
---|
735 | l = 1; |
---|
736 | while( (ran>dndl[l]) && (l<20) )l++; |
---|
737 | l = std::min( 19, l ); |
---|
738 | x = std::min( 1.0, pt*(binl[l-1] + G4UniformRand()*(binl[l]-binl[l-1]) ) ); |
---|
739 | currentParticle.SetMomentum( x*et*GeV ); // set the z-momentum |
---|
740 | if( forwardEnergy < forwardKinetic ) |
---|
741 | totalEnergy = vecMass + 0.04*std::fabs(normal()); |
---|
742 | else |
---|
743 | totalEnergy = vecMass + forwardEnergy - forwardKinetic; |
---|
744 | currentParticle.SetTotalEnergy( totalEnergy*GeV ); |
---|
745 | pp = std::sqrt( std::abs( totalEnergy*totalEnergy - vecMass*vecMass ) )*GeV; |
---|
746 | pp1 = currentParticle.GetMomentum().mag()/MeV; |
---|
747 | if( pp1 < 1.0e-6*GeV ) |
---|
748 | { |
---|
749 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
750 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
751 | G4double phi = twopi*G4UniformRand(); |
---|
752 | currentParticle.SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
753 | pp*sintheta*std::sin(phi)*MeV, |
---|
754 | pp*costheta*MeV ) ; |
---|
755 | } else { |
---|
756 | currentParticle.SetMomentum( currentParticle.GetMomentum() * (pp/pp1) ); |
---|
757 | } |
---|
758 | pseudoParticle[4] = pseudoParticle[4] + currentParticle; |
---|
759 | |
---|
760 | // |
---|
761 | // Current particle now finished |
---|
762 | // |
---|
763 | // Begin target particle |
---|
764 | // |
---|
765 | |
---|
766 | if( backwardNucleonCount < 18 ) |
---|
767 | { |
---|
768 | targetParticle.SetSide( -3 ); |
---|
769 | ++backwardNucleonCount; |
---|
770 | } |
---|
771 | else |
---|
772 | { |
---|
773 | // set pt and phi values, they are changed somewhat in the iteration loop |
---|
774 | // set mass parameter for lambda fragmentation model |
---|
775 | // |
---|
776 | vecMass = targetParticle.GetMass()/GeV; |
---|
777 | ran = -std::log(1.0-G4UniformRand()); |
---|
778 | aspar = 0.40; |
---|
779 | pt = std::max( 0.001, std::sqrt( std::pow( ran/4.0, 1.2 ) ) ); |
---|
780 | targetParticle.SetMomentum( pt*std::cos(phi)*GeV, pt*std::sin(phi)*GeV ); |
---|
781 | for( G4int j=0; j<20; ++j )binl[j] = (j-1.)/(19.*pt); |
---|
782 | et = pseudoParticle[1].GetTotalEnergy()/GeV; |
---|
783 | dndl[0] = 0.0; |
---|
784 | outerCounter = 0; |
---|
785 | eliminateThisParticle = true; // should never eliminate the target particle |
---|
786 | resetEnergies = true; |
---|
787 | while( ++outerCounter < 3 ) // start of outer iteration loop |
---|
788 | { |
---|
789 | for( l=1; l<20; ++l ) |
---|
790 | { |
---|
791 | x = (binl[l]+binl[l-1])/2.; |
---|
792 | if( x > 1.0/pt ) |
---|
793 | dndl[l] += dndl[l-1]; // changed from just = on 02 April 98 |
---|
794 | else |
---|
795 | dndl[l] = aspar/std::sqrt( std::pow((1.+aspar*x*aspar*x),3) ) * |
---|
796 | (binl[l]-binl[l-1])*et / std::sqrt( pt*x*et*pt*x*et+pt*pt+vecMass*vecMass ) + |
---|
797 | dndl[l-1]; |
---|
798 | } |
---|
799 | innerCounter = 0; |
---|
800 | while( ++innerCounter < 7 ) // start of inner iteration loop |
---|
801 | { |
---|
802 | l = 1; |
---|
803 | ran = G4UniformRand()*dndl[19]; |
---|
804 | while( ( ran >= dndl[l] ) && ( l < 20 ) )l++; |
---|
805 | l = std::min( 19, l ); |
---|
806 | x = std::min( 1.0, pt*(binl[l-1] + G4UniformRand()*(binl[l]-binl[l-1]) ) ); |
---|
807 | if( targetParticle.GetSide() < 0 )x *= -1.; |
---|
808 | targetParticle.SetMomentum( x*et*GeV ); // set the z-momentum |
---|
809 | totalEnergy = std::sqrt( x*et*x*et + pt*pt + vecMass*vecMass ); |
---|
810 | targetParticle.SetTotalEnergy( totalEnergy*GeV ); |
---|
811 | if( targetParticle.GetSide() < 0 ) |
---|
812 | { |
---|
813 | if( extraNucleonCount > 19 )x=0.999; |
---|
814 | G4double xxx = 0.95+0.05*extraNucleonCount/20.0; |
---|
815 | if( (backwardKinetic+totalEnergy-vecMass) < xxx*backwardEnergy ) |
---|
816 | { |
---|
817 | pseudoParticle[5] = pseudoParticle[5] + targetParticle; |
---|
818 | backwardKinetic += totalEnergy - vecMass; |
---|
819 | pseudoParticle[6] = pseudoParticle[4] + pseudoParticle[5]; |
---|
820 | pseudoParticle[6].SetMomentum( 0.0 ); // set z-momentum |
---|
821 | phi = pseudoParticle[6].Angle( pseudoParticle[8] ); |
---|
822 | if( pseudoParticle[6].GetMomentum().y()/MeV < 0.0 )phi = twopi - phi; |
---|
823 | phi += pi + normal() * pi / 12.0; |
---|
824 | if( phi > twopi )phi -= twopi; |
---|
825 | if( phi < 0.0 )phi = twopi - phi; |
---|
826 | outerCounter = 2; // leave outer loop |
---|
827 | eliminateThisParticle = false; // don't eliminate this particle |
---|
828 | resetEnergies = false; |
---|
829 | break; // leave inner loop |
---|
830 | } |
---|
831 | if( innerCounter > 5 )break; // leave inner loop |
---|
832 | if( forwardEnergy >= vecMass ) // switch sides |
---|
833 | { |
---|
834 | targetParticle.SetSide( 1 ); |
---|
835 | forwardEnergy -= vecMass; |
---|
836 | backwardEnergy += vecMass; |
---|
837 | --backwardCount; |
---|
838 | } |
---|
839 | G4ThreeVector momentum = targetParticle.GetMomentum(); |
---|
840 | targetParticle.SetMomentum( momentum.x() * 0.9, momentum.y() * 0.9 ); |
---|
841 | pt *= 0.9; |
---|
842 | dndl[19] *= 0.9; |
---|
843 | } |
---|
844 | else // target has gone to forward side |
---|
845 | { |
---|
846 | if( forwardEnergy < forwardKinetic ) |
---|
847 | totalEnergy = vecMass + 0.04*std::fabs(normal()); |
---|
848 | else |
---|
849 | totalEnergy = vecMass + forwardEnergy - forwardKinetic; |
---|
850 | targetParticle.SetTotalEnergy( totalEnergy*GeV ); |
---|
851 | pp = std::sqrt( std::abs( totalEnergy*totalEnergy - vecMass*vecMass ) )*GeV; |
---|
852 | pp1 = targetParticle.GetMomentum().mag()/MeV; |
---|
853 | if( pp1 < 1.0e-6*GeV ) |
---|
854 | { |
---|
855 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
856 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
857 | G4double phi = twopi*G4UniformRand(); |
---|
858 | targetParticle.SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
859 | pp*sintheta*std::sin(phi)*MeV, |
---|
860 | pp*costheta*MeV ) ; |
---|
861 | } |
---|
862 | else |
---|
863 | targetParticle.SetMomentum( targetParticle.GetMomentum() * (pp/pp1) ); |
---|
864 | |
---|
865 | pseudoParticle[4] = pseudoParticle[4] + targetParticle; |
---|
866 | outerCounter = 2; // leave outer loop |
---|
867 | eliminateThisParticle = false; // don't eliminate this particle |
---|
868 | resetEnergies = false; |
---|
869 | break; // leave inner loop |
---|
870 | } |
---|
871 | } // closes inner loop |
---|
872 | if( resetEnergies ) |
---|
873 | { |
---|
874 | // if we get to here, the inner loop has been Done 6 Times |
---|
875 | // reset the kinetic energies of previously Done particles, if they are lighter |
---|
876 | // than protons and in the forward hemisphere |
---|
877 | // then continue with outer loop |
---|
878 | |
---|
879 | forwardKinetic = backwardKinetic = 0.0; |
---|
880 | pseudoParticle[4].SetZero(); |
---|
881 | pseudoParticle[5].SetZero(); |
---|
882 | for( l=0; l<vecLen; ++l ) // changed from l=1 on 02 April 98 |
---|
883 | { |
---|
884 | if (vec[l]->GetSide() > 0 || |
---|
885 | vec[l]->GetDefinition()->GetParticleSubType() == "kaon" || |
---|
886 | vec[l]->GetDefinition()->GetParticleSubType() == "pi") { |
---|
887 | G4double tempMass = vec[l]->GetMass()/GeV; |
---|
888 | totalEnergy = |
---|
889 | std::max( tempMass, 0.95*vec[l]->GetTotalEnergy()/GeV + 0.05*tempMass ); |
---|
890 | vec[l]->SetTotalEnergy( totalEnergy*GeV ); |
---|
891 | pp = std::sqrt( std::abs( totalEnergy*totalEnergy - tempMass*tempMass ) )*GeV; |
---|
892 | pp1 = vec[l]->GetMomentum().mag()/MeV; |
---|
893 | if( pp1 < 1.0e-6*GeV ) |
---|
894 | { |
---|
895 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
896 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
897 | G4double phi = twopi*G4UniformRand(); |
---|
898 | vec[l]->SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
899 | pp*sintheta*std::sin(phi)*MeV, |
---|
900 | pp*costheta*MeV ) ; |
---|
901 | } |
---|
902 | else |
---|
903 | vec[l]->SetMomentum( vec[l]->GetMomentum() * (pp/pp1) ); |
---|
904 | |
---|
905 | pt = std::max( 0.001*GeV, std::sqrt( sqr(vec[l]->GetMomentum().x()/MeV) + |
---|
906 | sqr(vec[l]->GetMomentum().y()/MeV) ) )/GeV; |
---|
907 | if( vec[l]->GetSide() > 0) |
---|
908 | { |
---|
909 | forwardKinetic += vec[l]->GetKineticEnergy()/GeV; |
---|
910 | pseudoParticle[4] = pseudoParticle[4] + (*vec[l]); |
---|
911 | } else { |
---|
912 | backwardKinetic += vec[l]->GetKineticEnergy()/GeV; |
---|
913 | pseudoParticle[5] = pseudoParticle[5] + (*vec[l]); |
---|
914 | } |
---|
915 | } // if pi, K or forward |
---|
916 | } // for l |
---|
917 | } // if (resetEnergies) |
---|
918 | } // closes outer loop |
---|
919 | } |
---|
920 | |
---|
921 | // |
---|
922 | // Target particle finished. |
---|
923 | // |
---|
924 | // Now produce backward nucleons with a cluster model |
---|
925 | // |
---|
926 | pseudoParticle[6].Lorentz( pseudoParticle[3], pseudoParticle[2] ); |
---|
927 | pseudoParticle[6] = pseudoParticle[6] - pseudoParticle[4]; |
---|
928 | pseudoParticle[6] = pseudoParticle[6] - pseudoParticle[5]; |
---|
929 | if( backwardNucleonCount == 1 ) // target particle is the only backward nucleon |
---|
930 | { |
---|
931 | G4double ekin = |
---|
932 | std::min( backwardEnergy-backwardKinetic, centerofmassEnergy/2.0-protonMass/GeV ); |
---|
933 | |
---|
934 | if( ekin < 0.04 )ekin = 0.04 * std::fabs( normal() ); |
---|
935 | vecMass = targetParticle.GetMass()/GeV; |
---|
936 | totalEnergy = ekin+vecMass; |
---|
937 | targetParticle.SetTotalEnergy( totalEnergy*GeV ); |
---|
938 | pp = std::sqrt( std::abs( totalEnergy*totalEnergy - vecMass*vecMass ) )*GeV; |
---|
939 | pp1 = pseudoParticle[6].GetMomentum().mag()/MeV; |
---|
940 | if( pp1 < 1.0e-6*GeV ) |
---|
941 | { |
---|
942 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
943 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
944 | G4double phi = twopi*G4UniformRand(); |
---|
945 | targetParticle.SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
946 | pp*sintheta*std::sin(phi)*MeV, |
---|
947 | pp*costheta*MeV ) ; |
---|
948 | } else { |
---|
949 | targetParticle.SetMomentum( pseudoParticle[6].GetMomentum() * (pp/pp1) ); |
---|
950 | } |
---|
951 | pseudoParticle[5] = pseudoParticle[5] + targetParticle; |
---|
952 | } |
---|
953 | else // more than one backward nucleon |
---|
954 | { |
---|
955 | const G4double cpar[] = { 0.6, 0.6, 0.35, 0.15, 0.10 }; |
---|
956 | const G4double gpar[] = { 2.6, 2.6, 1.80, 1.30, 1.20 }; |
---|
957 | // Replaced the following min function to get correct behaviour on DEC. |
---|
958 | // G4int tempCount = std::min( 5, backwardNucleonCount ) - 1; |
---|
959 | G4int tempCount; |
---|
960 | if (backwardNucleonCount < 5) |
---|
961 | { |
---|
962 | tempCount = backwardNucleonCount; |
---|
963 | } |
---|
964 | else |
---|
965 | { |
---|
966 | tempCount = 5; |
---|
967 | } |
---|
968 | tempCount--; |
---|
969 | //cout << "backwardNucleonCount " << backwardNucleonCount << G4endl; |
---|
970 | //cout << "tempCount " << tempCount << G4endl; |
---|
971 | G4double rmb0 = 0.0; |
---|
972 | if( targetParticle.GetSide() == -3 ) |
---|
973 | rmb0 += targetParticle.GetMass()/GeV; |
---|
974 | for( i=0; i<vecLen; ++i ) |
---|
975 | { |
---|
976 | if( vec[i]->GetSide() == -3 )rmb0 += vec[i]->GetMass()/GeV; |
---|
977 | } |
---|
978 | rmb = rmb0 + std::pow(-std::log(1.0-G4UniformRand()),cpar[tempCount]) / gpar[tempCount]; |
---|
979 | totalEnergy = pseudoParticle[6].GetTotalEnergy()/GeV; |
---|
980 | vecMass = std::min( rmb, totalEnergy ); |
---|
981 | pseudoParticle[6].SetMass( vecMass*GeV ); |
---|
982 | pp = std::sqrt( std::abs( totalEnergy*totalEnergy - vecMass*vecMass ) )*GeV; |
---|
983 | pp1 = pseudoParticle[6].GetMomentum().mag()/MeV; |
---|
984 | if( pp1 < 1.0e-6*GeV ) |
---|
985 | { |
---|
986 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
987 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
988 | G4double phi = twopi*G4UniformRand(); |
---|
989 | pseudoParticle[6].SetMomentum( -pp*sintheta*std::cos(phi)*MeV, |
---|
990 | -pp*sintheta*std::sin(phi)*MeV, |
---|
991 | -pp*costheta*MeV ) ; |
---|
992 | } |
---|
993 | else |
---|
994 | pseudoParticle[6].SetMomentum( pseudoParticle[6].GetMomentum() * (-pp/pp1) ); |
---|
995 | |
---|
996 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> tempV; // tempV contains the backward nucleons |
---|
997 | tempV.Initialize( backwardNucleonCount ); |
---|
998 | G4int tempLen = 0; |
---|
999 | if( targetParticle.GetSide() == -3 )tempV.SetElement( tempLen++, &targetParticle ); |
---|
1000 | for( i=0; i<vecLen; ++i ) |
---|
1001 | { |
---|
1002 | if( vec[i]->GetSide() == -3 )tempV.SetElement( tempLen++, vec[i] ); |
---|
1003 | } |
---|
1004 | if( tempLen != backwardNucleonCount ) |
---|
1005 | { |
---|
1006 | G4cerr << "tempLen is not the same as backwardNucleonCount" << G4endl; |
---|
1007 | G4cerr << "tempLen = " << tempLen; |
---|
1008 | G4cerr << ", backwardNucleonCount = " << backwardNucleonCount << G4endl; |
---|
1009 | G4cerr << "targetParticle side = " << targetParticle.GetSide() << G4endl; |
---|
1010 | G4cerr << "currentParticle side = " << currentParticle.GetSide() << G4endl; |
---|
1011 | for( i=0; i<vecLen; ++i ) |
---|
1012 | G4cerr << "particle #" << i << " side = " << vec[i]->GetSide() << G4endl; |
---|
1013 | G4Exception("G4ReactionDynamics::GenerateXandPt", "601", |
---|
1014 | FatalException, "Mismatch in nucleon count"); |
---|
1015 | } |
---|
1016 | constantCrossSection = true; |
---|
1017 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
1018 | if( tempLen >= 2 ) |
---|
1019 | { |
---|
1020 | wgt = GenerateNBodyEvent( |
---|
1021 | pseudoParticle[6].GetMass(), constantCrossSection, tempV, tempLen ); |
---|
1022 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
1023 | if( targetParticle.GetSide() == -3 ) |
---|
1024 | { |
---|
1025 | targetParticle.Lorentz( targetParticle, pseudoParticle[6] ); |
---|
1026 | // tempV contains the real stuff |
---|
1027 | pseudoParticle[5] = pseudoParticle[5] + targetParticle; |
---|
1028 | } |
---|
1029 | for( i=0; i<vecLen; ++i ) |
---|
1030 | { |
---|
1031 | if( vec[i]->GetSide() == -3 ) |
---|
1032 | { |
---|
1033 | vec[i]->Lorentz( *vec[i], pseudoParticle[6] ); |
---|
1034 | pseudoParticle[5] = pseudoParticle[5] + (*vec[i]); |
---|
1035 | } |
---|
1036 | } |
---|
1037 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
1038 | } |
---|
1039 | } |
---|
1040 | // |
---|
1041 | // Lorentz transformation in lab system |
---|
1042 | // |
---|
1043 | if( vecLen == 0 )return false; // all the secondaries have been eliminated |
---|
1044 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
1045 | |
---|
1046 | currentParticle.Lorentz( currentParticle, pseudoParticle[1] ); |
---|
1047 | targetParticle.Lorentz( targetParticle, pseudoParticle[1] ); |
---|
1048 | for( i=0; i<vecLen; ++i ) vec[i]->Lorentz( *vec[i], pseudoParticle[1] ); |
---|
1049 | |
---|
1050 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
1051 | // |
---|
1052 | // leadFlag will be true |
---|
1053 | // iff original particle is at least as heavy as K+ and not a proton or |
---|
1054 | // neutron AND if incident particle is at least as heavy as K+ and it is |
---|
1055 | // not a proton or neutron leadFlag is set to the incident particle |
---|
1056 | // or |
---|
1057 | // target particle is at least as heavy as K+ and it is not a proton or |
---|
1058 | // neutron leadFlag is set to the target particle |
---|
1059 | // |
---|
1060 | G4bool leadingStrangeParticleHasChanged = true; |
---|
1061 | if( leadFlag ) |
---|
1062 | { |
---|
1063 | if( currentParticle.GetDefinition() == leadingStrangeParticle.GetDefinition() ) |
---|
1064 | leadingStrangeParticleHasChanged = false; |
---|
1065 | if( leadingStrangeParticleHasChanged && |
---|
1066 | ( targetParticle.GetDefinition() == leadingStrangeParticle.GetDefinition() ) ) |
---|
1067 | leadingStrangeParticleHasChanged = false; |
---|
1068 | if( leadingStrangeParticleHasChanged ) |
---|
1069 | { |
---|
1070 | for( i=0; i<vecLen; i++ ) |
---|
1071 | { |
---|
1072 | if( vec[i]->GetDefinition() == leadingStrangeParticle.GetDefinition() ) |
---|
1073 | { |
---|
1074 | leadingStrangeParticleHasChanged = false; |
---|
1075 | break; |
---|
1076 | } |
---|
1077 | } |
---|
1078 | } |
---|
1079 | if( leadingStrangeParticleHasChanged ) |
---|
1080 | { |
---|
1081 | G4bool leadTest = |
---|
1082 | (leadingStrangeParticle.GetDefinition()->GetParticleSubType() == "kaon" || |
---|
1083 | leadingStrangeParticle.GetDefinition()->GetParticleSubType() == "pi"); |
---|
1084 | G4bool targetTest = |
---|
1085 | (targetParticle.GetDefinition()->GetParticleSubType() == "kaon" || |
---|
1086 | targetParticle.GetDefinition()->GetParticleSubType() == "pi"); |
---|
1087 | |
---|
1088 | // following modified by JLC 22-Oct-97 |
---|
1089 | |
---|
1090 | if( (leadTest&&targetTest) || !(leadTest||targetTest) ) // both true or both false |
---|
1091 | { |
---|
1092 | targetParticle.SetDefinitionAndUpdateE( leadingStrangeParticle.GetDefinition() ); |
---|
1093 | targetHasChanged = true; |
---|
1094 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
1095 | } |
---|
1096 | else |
---|
1097 | { |
---|
1098 | currentParticle.SetDefinitionAndUpdateE( leadingStrangeParticle.GetDefinition() ); |
---|
1099 | incidentHasChanged = false; |
---|
1100 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
1101 | } |
---|
1102 | } |
---|
1103 | } // end of if( leadFlag ) |
---|
1104 | |
---|
1105 | // Get number of final state nucleons and nucleons remaining in |
---|
1106 | // target nucleus |
---|
1107 | |
---|
1108 | std::pair<G4int, G4int> finalStateNucleons = |
---|
1109 | GetFinalStateNucleons(originalTarget, vec, vecLen); |
---|
1110 | |
---|
1111 | G4int protonsInFinalState = finalStateNucleons.first; |
---|
1112 | G4int neutronsInFinalState = finalStateNucleons.second; |
---|
1113 | |
---|
1114 | G4int numberofFinalStateNucleons = |
---|
1115 | protonsInFinalState + neutronsInFinalState; |
---|
1116 | |
---|
1117 | if (currentParticle.GetDefinition()->GetBaryonNumber() == 1 && |
---|
1118 | targetParticle.GetDefinition()->GetBaryonNumber() == 1 && |
---|
1119 | originalIncident->GetDefinition()->GetPDGMass() < |
---|
1120 | G4Lambda::Lambda()->GetPDGMass()) |
---|
1121 | numberofFinalStateNucleons++; |
---|
1122 | |
---|
1123 | numberofFinalStateNucleons = std::max(1, numberofFinalStateNucleons); |
---|
1124 | |
---|
1125 | G4int PinNucleus = std::max(0, |
---|
1126 | targetNucleus.GetZ_asInt() - protonsInFinalState); |
---|
1127 | G4int NinNucleus = std::max(0, |
---|
1128 | targetNucleus.GetN_asInt() - neutronsInFinalState); |
---|
1129 | |
---|
1130 | pseudoParticle[3].SetMomentum( 0.0, 0.0, pOriginal*GeV ); |
---|
1131 | pseudoParticle[3].SetMass( mOriginal*GeV ); |
---|
1132 | pseudoParticle[3].SetTotalEnergy( |
---|
1133 | std::sqrt( pOriginal*pOriginal + mOriginal*mOriginal )*GeV ); |
---|
1134 | |
---|
1135 | G4ParticleDefinition * aOrgDef = modifiedOriginal.GetDefinition(); |
---|
1136 | G4int diff = 0; |
---|
1137 | if(aOrgDef == G4Proton::Proton() || aOrgDef == G4Neutron::Neutron() ) diff = 1; |
---|
1138 | if(numberofFinalStateNucleons == 1) diff = 0; |
---|
1139 | pseudoParticle[4].SetMomentum( 0.0, 0.0, 0.0 ); |
---|
1140 | pseudoParticle[4].SetMass( protonMass*(numberofFinalStateNucleons-diff)*MeV ); |
---|
1141 | pseudoParticle[4].SetTotalEnergy( protonMass*(numberofFinalStateNucleons-diff)*MeV ); |
---|
1142 | |
---|
1143 | G4double theoreticalKinetic = |
---|
1144 | pseudoParticle[3].GetTotalEnergy()/MeV + |
---|
1145 | pseudoParticle[4].GetTotalEnergy()/MeV - |
---|
1146 | currentParticle.GetMass()/MeV - |
---|
1147 | targetParticle.GetMass()/MeV; |
---|
1148 | |
---|
1149 | G4double simulatedKinetic = |
---|
1150 | currentParticle.GetKineticEnergy()/MeV + targetParticle.GetKineticEnergy()/MeV; |
---|
1151 | |
---|
1152 | pseudoParticle[5] = pseudoParticle[3] + pseudoParticle[4]; |
---|
1153 | pseudoParticle[3].Lorentz( pseudoParticle[3], pseudoParticle[5] ); |
---|
1154 | pseudoParticle[4].Lorentz( pseudoParticle[4], pseudoParticle[5] ); |
---|
1155 | |
---|
1156 | pseudoParticle[7].SetZero(); |
---|
1157 | pseudoParticle[7] = pseudoParticle[7] + currentParticle; |
---|
1158 | pseudoParticle[7] = pseudoParticle[7] + targetParticle; |
---|
1159 | |
---|
1160 | for( i=0; i<vecLen; ++i ) |
---|
1161 | { |
---|
1162 | pseudoParticle[7] = pseudoParticle[7] + *vec[i]; |
---|
1163 | simulatedKinetic += vec[i]->GetKineticEnergy()/MeV; |
---|
1164 | theoreticalKinetic -= vec[i]->GetMass()/MeV; |
---|
1165 | } |
---|
1166 | |
---|
1167 | if( vecLen <= 16 && vecLen > 0 ) |
---|
1168 | { |
---|
1169 | // must create a new set of ReactionProducts here because GenerateNBody will |
---|
1170 | // modify the momenta for the particles, and we don't want to do this |
---|
1171 | // |
---|
1172 | G4ReactionProduct tempR[130]; |
---|
1173 | tempR[0] = currentParticle; |
---|
1174 | tempR[1] = targetParticle; |
---|
1175 | for( i=0; i<vecLen; ++i )tempR[i+2] = *vec[i]; |
---|
1176 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> tempV; |
---|
1177 | tempV.Initialize( vecLen+2 ); |
---|
1178 | G4int tempLen = 0; |
---|
1179 | for( i=0; i<vecLen+2; ++i )tempV.SetElement( tempLen++, &tempR[i] ); |
---|
1180 | constantCrossSection = true; |
---|
1181 | |
---|
1182 | wgt = GenerateNBodyEvent( pseudoParticle[3].GetTotalEnergy()/MeV+ |
---|
1183 | pseudoParticle[4].GetTotalEnergy()/MeV, |
---|
1184 | constantCrossSection, tempV, tempLen ); |
---|
1185 | if (wgt == -1) { |
---|
1186 | G4double Qvalue = 0; |
---|
1187 | for (i = 0; i < tempLen; i++) Qvalue += tempV[i]->GetMass(); |
---|
1188 | wgt = GenerateNBodyEvent( Qvalue/MeV, |
---|
1189 | constantCrossSection, tempV, tempLen ); |
---|
1190 | } |
---|
1191 | if(wgt>-.5) |
---|
1192 | { |
---|
1193 | theoreticalKinetic = 0.0; |
---|
1194 | for( i=0; i<tempLen; ++i ) |
---|
1195 | { |
---|
1196 | pseudoParticle[6].Lorentz( *tempV[i], pseudoParticle[4] ); |
---|
1197 | theoreticalKinetic += pseudoParticle[6].GetKineticEnergy()/MeV; |
---|
1198 | } |
---|
1199 | } |
---|
1200 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
1201 | } |
---|
1202 | // |
---|
1203 | // Make sure, that the kinetic energies are correct |
---|
1204 | // |
---|
1205 | if( simulatedKinetic != 0.0 ) |
---|
1206 | { |
---|
1207 | wgt = (theoreticalKinetic)/simulatedKinetic; |
---|
1208 | theoreticalKinetic = currentParticle.GetKineticEnergy()/MeV * wgt; |
---|
1209 | simulatedKinetic = theoreticalKinetic; |
---|
1210 | currentParticle.SetKineticEnergy( theoreticalKinetic*MeV ); |
---|
1211 | pp = currentParticle.GetTotalMomentum()/MeV; |
---|
1212 | pp1 = currentParticle.GetMomentum().mag()/MeV; |
---|
1213 | if( pp1 < 1.0e-6*GeV ) |
---|
1214 | { |
---|
1215 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
1216 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
1217 | G4double phi = twopi*G4UniformRand(); |
---|
1218 | currentParticle.SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
1219 | pp*sintheta*std::sin(phi)*MeV, |
---|
1220 | pp*costheta*MeV ) ; |
---|
1221 | } |
---|
1222 | else |
---|
1223 | { |
---|
1224 | currentParticle.SetMomentum( currentParticle.GetMomentum() * (pp/pp1) ); |
---|
1225 | } |
---|
1226 | theoreticalKinetic = targetParticle.GetKineticEnergy()/MeV * wgt; |
---|
1227 | targetParticle.SetKineticEnergy( theoreticalKinetic*MeV ); |
---|
1228 | simulatedKinetic += theoreticalKinetic; |
---|
1229 | pp = targetParticle.GetTotalMomentum()/MeV; |
---|
1230 | pp1 = targetParticle.GetMomentum().mag()/MeV; |
---|
1231 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
1232 | if( pp1 < 1.0e-6*GeV ) |
---|
1233 | { |
---|
1234 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
1235 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
1236 | G4double phi = twopi*G4UniformRand(); |
---|
1237 | targetParticle.SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
1238 | pp*sintheta*std::sin(phi)*MeV, |
---|
1239 | pp*costheta*MeV ) ; |
---|
1240 | } else { |
---|
1241 | targetParticle.SetMomentum( targetParticle.GetMomentum() * (pp/pp1) ); |
---|
1242 | } |
---|
1243 | for( i=0; i<vecLen; ++i ) |
---|
1244 | { |
---|
1245 | theoreticalKinetic = vec[i]->GetKineticEnergy()/MeV * wgt; |
---|
1246 | simulatedKinetic += theoreticalKinetic; |
---|
1247 | vec[i]->SetKineticEnergy( theoreticalKinetic*MeV ); |
---|
1248 | pp = vec[i]->GetTotalMomentum()/MeV; |
---|
1249 | pp1 = vec[i]->GetMomentum().mag()/MeV; |
---|
1250 | if( pp1 < 1.0e-6*GeV ) |
---|
1251 | { |
---|
1252 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
1253 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
1254 | G4double phi = twopi*G4UniformRand(); |
---|
1255 | vec[i]->SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
1256 | pp*sintheta*std::sin(phi)*MeV, |
---|
1257 | pp*costheta*MeV ) ; |
---|
1258 | } |
---|
1259 | else |
---|
1260 | vec[i]->SetMomentum( vec[i]->GetMomentum() * (pp/pp1) ); |
---|
1261 | } |
---|
1262 | } |
---|
1263 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
1264 | |
---|
1265 | Rotate( numberofFinalStateNucleons, pseudoParticle[3].GetMomentum(), |
---|
1266 | modifiedOriginal, originalIncident, targetNucleus, |
---|
1267 | currentParticle, targetParticle, vec, vecLen ); |
---|
1268 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
1269 | // |
---|
1270 | // add black track particles |
---|
1271 | // the total number of particles produced is restricted to 198 |
---|
1272 | // this may have influence on very high energies |
---|
1273 | // |
---|
1274 | if( atomicWeight >= 1.5 ) |
---|
1275 | { |
---|
1276 | // npnb is number of proton/neutron black track particles |
---|
1277 | // ndta is the number of deuterons, tritons, and alphas produced |
---|
1278 | // epnb is the kinetic energy available for proton/neutron black track particles |
---|
1279 | // edta is the kinetic energy available for deuteron/triton/alpha particles |
---|
1280 | // |
---|
1281 | G4int npnb = 0; |
---|
1282 | G4int ndta = 0; |
---|
1283 | |
---|
1284 | G4double epnb, edta; |
---|
1285 | if (veryForward) { |
---|
1286 | epnb = targetNucleus.GetAnnihilationPNBlackTrackEnergy(); |
---|
1287 | edta = targetNucleus.GetAnnihilationDTABlackTrackEnergy(); |
---|
1288 | } else { |
---|
1289 | epnb = targetNucleus.GetPNBlackTrackEnergy(); |
---|
1290 | edta = targetNucleus.GetDTABlackTrackEnergy(); |
---|
1291 | } |
---|
1292 | |
---|
1293 | const G4double pnCutOff = 0.001; |
---|
1294 | const G4double dtaCutOff = 0.001; |
---|
1295 | const G4double kineticMinimum = 1.e-6; |
---|
1296 | const G4double kineticFactor = -0.010; |
---|
1297 | G4double sprob = 0.0; // sprob = probability of self-absorption in heavy molecules |
---|
1298 | const G4double ekIncident = originalIncident->GetKineticEnergy()/GeV; |
---|
1299 | if( ekIncident >= 5.0 )sprob = std::min( 1.0, 0.6*std::log(ekIncident-4.0) ); |
---|
1300 | if( epnb >= pnCutOff ) |
---|
1301 | { |
---|
1302 | npnb = Poisson((1.5+1.25*numberofFinalStateNucleons)*epnb/(epnb+edta)); |
---|
1303 | if( numberofFinalStateNucleons + npnb > atomicWeight ) |
---|
1304 | npnb = G4int(atomicWeight+0.00001 - numberofFinalStateNucleons); |
---|
1305 | npnb = std::min( npnb, 127-vecLen ); |
---|
1306 | } |
---|
1307 | if( edta >= dtaCutOff ) |
---|
1308 | { |
---|
1309 | ndta = Poisson( (1.5+1.25*numberofFinalStateNucleons)*edta/(epnb+edta) ); |
---|
1310 | ndta = std::min( ndta, 127-vecLen ); |
---|
1311 | } |
---|
1312 | if (npnb == 0 && ndta == 0) npnb = 1; |
---|
1313 | |
---|
1314 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
1315 | |
---|
1316 | AddBlackTrackParticles(epnb, npnb, edta, ndta, sprob, kineticMinimum, |
---|
1317 | kineticFactor, modifiedOriginal, |
---|
1318 | PinNucleus, NinNucleus, targetNucleus, |
---|
1319 | vec, vecLen); |
---|
1320 | |
---|
1321 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
1322 | } |
---|
1323 | //if( centerofmassEnergy <= (4.0+G4UniformRand()) ) |
---|
1324 | // MomentumCheck( modifiedOriginal, currentParticle, targetParticle, vec, vecLen ); |
---|
1325 | // |
---|
1326 | // calculate time delay for nuclear reactions |
---|
1327 | // |
---|
1328 | if( (atomicWeight >= 1.5) && (atomicWeight <= 230.0) && (ekOriginal <= 0.2) ) |
---|
1329 | currentParticle.SetTOF( 1.0-500.0*std::exp(-ekOriginal/0.04)*std::log(G4UniformRand()) ); |
---|
1330 | else |
---|
1331 | currentParticle.SetTOF( 1.0 ); |
---|
1332 | return true; |
---|
1333 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
1334 | } |
---|
1335 | |
---|
1336 | void G4ReactionDynamics::SuppressChargedPions( |
---|
1337 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> &vec, |
---|
1338 | G4int &vecLen, |
---|
1339 | const G4ReactionProduct &modifiedOriginal, |
---|
1340 | G4ReactionProduct ¤tParticle, |
---|
1341 | G4ReactionProduct &targetParticle, |
---|
1342 | const G4Nucleus &targetNucleus, |
---|
1343 | G4bool &incidentHasChanged, |
---|
1344 | G4bool &targetHasChanged ) |
---|
1345 | { |
---|
1346 | // this code was originally in the fortran code TWOCLU |
---|
1347 | // |
---|
1348 | // suppress charged pions, for various reasons |
---|
1349 | // |
---|
1350 | G4double mOriginal = modifiedOriginal.GetMass()/GeV; |
---|
1351 | G4double etOriginal = modifiedOriginal.GetTotalEnergy()/GeV; |
---|
1352 | G4double targetMass = targetParticle.GetDefinition()->GetPDGMass()/GeV; |
---|
1353 | G4double cmEnergy = std::sqrt( mOriginal*mOriginal + targetMass*targetMass + |
---|
1354 | 2.0*targetMass*etOriginal ); |
---|
1355 | G4double eAvailable = cmEnergy - mOriginal - targetMass; |
---|
1356 | for (G4int i = 0; i < vecLen; i++) eAvailable -= vec[i]->GetMass()/GeV; |
---|
1357 | |
---|
1358 | const G4double atomicWeight = G4double(targetNucleus.GetA_asInt()); |
---|
1359 | const G4double atomicNumber = G4double(targetNucleus.GetZ_asInt()); |
---|
1360 | const G4double pOriginal = modifiedOriginal.GetTotalMomentum()/GeV; |
---|
1361 | |
---|
1362 | G4ParticleDefinition *aPiMinus = G4PionMinus::PionMinus(); |
---|
1363 | G4ParticleDefinition *aPiPlus = G4PionPlus::PionPlus(); |
---|
1364 | G4ParticleDefinition* aPiZero = G4PionZero::PionZero(); |
---|
1365 | G4ParticleDefinition *aProton = G4Proton::Proton(); |
---|
1366 | G4ParticleDefinition *aNeutron = G4Neutron::Neutron(); |
---|
1367 | G4double piMass = aPiPlus->GetPDGMass()/GeV; |
---|
1368 | G4double nucleonMass = aNeutron->GetPDGMass()/GeV; |
---|
1369 | |
---|
1370 | const G4bool antiTest = |
---|
1371 | modifiedOriginal.GetDefinition() != G4AntiProton::AntiProton() && |
---|
1372 | modifiedOriginal.GetDefinition() != G4AntiNeutron::AntiNeutron() && |
---|
1373 | modifiedOriginal.GetDefinition() != G4AntiLambda::AntiLambda() && |
---|
1374 | modifiedOriginal.GetDefinition() != G4AntiSigmaPlus::AntiSigmaPlus() && |
---|
1375 | modifiedOriginal.GetDefinition() != G4AntiSigmaMinus::AntiSigmaMinus() && |
---|
1376 | modifiedOriginal.GetDefinition() != G4AntiXiZero::AntiXiZero() && |
---|
1377 | modifiedOriginal.GetDefinition() != G4AntiXiMinus::AntiXiMinus() && |
---|
1378 | modifiedOriginal.GetDefinition() != G4AntiOmegaMinus::AntiOmegaMinus(); |
---|
1379 | |
---|
1380 | if( antiTest && ( |
---|
1381 | currentParticle.GetDefinition() == aPiPlus || |
---|
1382 | currentParticle.GetDefinition() == aPiZero || |
---|
1383 | currentParticle.GetDefinition() == aPiMinus ) && |
---|
1384 | ( G4UniformRand() <= (10.0-pOriginal)/6.0 ) && |
---|
1385 | ( G4UniformRand() <= atomicWeight/300.0 ) ) |
---|
1386 | { |
---|
1387 | if (eAvailable > nucleonMass - piMass) { |
---|
1388 | if( G4UniformRand() > atomicNumber/atomicWeight ) |
---|
1389 | currentParticle.SetDefinitionAndUpdateE( aNeutron ); |
---|
1390 | else |
---|
1391 | currentParticle.SetDefinitionAndUpdateE( aProton ); |
---|
1392 | incidentHasChanged = true; |
---|
1393 | } |
---|
1394 | } |
---|
1395 | if( antiTest && ( |
---|
1396 | targetParticle.GetDefinition() == aPiPlus || |
---|
1397 | targetParticle.GetDefinition() == aPiZero || |
---|
1398 | targetParticle.GetDefinition() == aPiMinus ) && |
---|
1399 | ( G4UniformRand() <= (10.0-pOriginal)/6.0 ) && |
---|
1400 | ( G4UniformRand() <= atomicWeight/300.0 ) ) |
---|
1401 | { |
---|
1402 | if (eAvailable > nucleonMass - piMass) { |
---|
1403 | if( G4UniformRand() > atomicNumber/atomicWeight ) |
---|
1404 | targetParticle.SetDefinitionAndUpdateE( aNeutron ); |
---|
1405 | else |
---|
1406 | targetParticle.SetDefinitionAndUpdateE( aProton ); |
---|
1407 | targetHasChanged = true; |
---|
1408 | } |
---|
1409 | } |
---|
1410 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
1411 | for( G4int i=0; i<vecLen; ++i ) |
---|
1412 | { |
---|
1413 | if( antiTest && ( |
---|
1414 | vec[i]->GetDefinition() == aPiPlus || |
---|
1415 | vec[i]->GetDefinition() == aPiZero || |
---|
1416 | vec[i]->GetDefinition() == aPiMinus ) && |
---|
1417 | ( G4UniformRand() <= (10.0-pOriginal)/6.0 ) && |
---|
1418 | ( G4UniformRand() <= atomicWeight/300.0 ) ) |
---|
1419 | { |
---|
1420 | if (eAvailable > nucleonMass - piMass) { |
---|
1421 | if( G4UniformRand() > atomicNumber/atomicWeight ) |
---|
1422 | vec[i]->SetDefinitionAndUpdateE( aNeutron ); |
---|
1423 | else |
---|
1424 | vec[i]->SetDefinitionAndUpdateE( aProton ); |
---|
1425 | } |
---|
1426 | } |
---|
1427 | } |
---|
1428 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
1429 | } |
---|
1430 | |
---|
1431 | G4bool G4ReactionDynamics::TwoCluster( |
---|
1432 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> &vec, |
---|
1433 | G4int &vecLen, |
---|
1434 | G4ReactionProduct &modifiedOriginal, // Fermi motion & evap. effects included |
---|
1435 | const G4HadProjectile *originalIncident, // the original incident particle |
---|
1436 | G4ReactionProduct ¤tParticle, |
---|
1437 | G4ReactionProduct &targetParticle, |
---|
1438 | const G4DynamicParticle* originalTarget, |
---|
1439 | const G4Nucleus &targetNucleus, |
---|
1440 | G4bool &incidentHasChanged, |
---|
1441 | G4bool &targetHasChanged, |
---|
1442 | G4bool leadFlag, |
---|
1443 | G4ReactionProduct &leadingStrangeParticle ) |
---|
1444 | { |
---|
1445 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
1446 | // derived from original FORTRAN code TWOCLU by H. Fesefeldt (11-Oct-1987) |
---|
1447 | // |
---|
1448 | // Generation of X- and PT- values for incident, target, and all secondary particles |
---|
1449 | // |
---|
1450 | // A simple two cluster model is used. |
---|
1451 | // This should be sufficient for low energy interactions. |
---|
1452 | // |
---|
1453 | |
---|
1454 | // + debugging |
---|
1455 | // raise(SIGSEGV); |
---|
1456 | // - debugging |
---|
1457 | |
---|
1458 | G4int i; |
---|
1459 | G4ParticleDefinition *aProton = G4Proton::Proton(); |
---|
1460 | G4ParticleDefinition *aNeutron = G4Neutron::Neutron(); |
---|
1461 | G4ParticleDefinition *aPiPlus = G4PionPlus::PionPlus(); |
---|
1462 | G4ParticleDefinition *aPiMinus = G4PionMinus::PionMinus(); |
---|
1463 | G4ParticleDefinition *aPiZero = G4PionZero::PionZero(); |
---|
1464 | G4bool veryForward = false; |
---|
1465 | |
---|
1466 | const G4double protonMass = aProton->GetPDGMass()/MeV; |
---|
1467 | const G4double ekOriginal = modifiedOriginal.GetKineticEnergy()/GeV; |
---|
1468 | const G4double etOriginal = modifiedOriginal.GetTotalEnergy()/GeV; |
---|
1469 | const G4double mOriginal = modifiedOriginal.GetMass()/GeV; |
---|
1470 | const G4double pOriginal = modifiedOriginal.GetMomentum().mag()/GeV; |
---|
1471 | G4double targetMass = targetParticle.GetDefinition()->GetPDGMass()/GeV; |
---|
1472 | G4double centerofmassEnergy = std::sqrt( mOriginal*mOriginal + |
---|
1473 | targetMass*targetMass + |
---|
1474 | 2.0*targetMass*etOriginal ); // GeV |
---|
1475 | G4double currentMass = currentParticle.GetMass()/GeV; |
---|
1476 | targetMass = targetParticle.GetMass()/GeV; |
---|
1477 | |
---|
1478 | if( currentMass == 0.0 && targetMass == 0.0 ) |
---|
1479 | { |
---|
1480 | G4double ek = currentParticle.GetKineticEnergy(); |
---|
1481 | G4ThreeVector m = currentParticle.GetMomentum(); |
---|
1482 | currentParticle = *vec[0]; |
---|
1483 | targetParticle = *vec[1]; |
---|
1484 | for( i=0; i<(vecLen-2); ++i )*vec[i] = *vec[i+2]; |
---|
1485 | if(vecLen<2) |
---|
1486 | { |
---|
1487 | for(G4int i=0; i<vecLen; i++) delete vec[i]; |
---|
1488 | vecLen = 0; |
---|
1489 | throw G4HadReentrentException(__FILE__, __LINE__, |
---|
1490 | "G4ReactionDynamics::TwoCluster: Negative number of particles"); |
---|
1491 | } |
---|
1492 | delete vec[vecLen-1]; |
---|
1493 | delete vec[vecLen-2]; |
---|
1494 | vecLen -= 2; |
---|
1495 | currentMass = currentParticle.GetMass()/GeV; |
---|
1496 | targetMass = targetParticle.GetMass()/GeV; |
---|
1497 | incidentHasChanged = true; |
---|
1498 | targetHasChanged = true; |
---|
1499 | currentParticle.SetKineticEnergy( ek ); |
---|
1500 | currentParticle.SetMomentum( m ); |
---|
1501 | veryForward = true; |
---|
1502 | } |
---|
1503 | |
---|
1504 | const G4double atomicWeight = G4double(targetNucleus.GetA_asInt()); |
---|
1505 | const G4double atomicNumber = G4double(targetNucleus.GetZ_asInt()); |
---|
1506 | // |
---|
1507 | // particles have been distributed in forward and backward hemispheres |
---|
1508 | // in center of mass system of the hadron nucleon interaction |
---|
1509 | // |
---|
1510 | // incident is always in forward hemisphere |
---|
1511 | G4int forwardCount = 1; // number of particles in forward hemisphere |
---|
1512 | currentParticle.SetSide( 1 ); |
---|
1513 | G4double forwardMass = currentParticle.GetMass()/GeV; |
---|
1514 | G4double cMass = forwardMass; |
---|
1515 | |
---|
1516 | // target is always in backward hemisphere |
---|
1517 | G4int backwardCount = 1; // number of particles in backward hemisphere |
---|
1518 | G4int backwardNucleonCount = 1; // number of nucleons in backward hemisphere |
---|
1519 | targetParticle.SetSide( -1 ); |
---|
1520 | G4double backwardMass = targetParticle.GetMass()/GeV; |
---|
1521 | G4double bMass = backwardMass; |
---|
1522 | |
---|
1523 | for( i=0; i<vecLen; ++i ) |
---|
1524 | { |
---|
1525 | if( vec[i]->GetSide() < 0 )vec[i]->SetSide( -1 ); // added by JLC, 2Jul97 |
---|
1526 | // to take care of the case where vec has been preprocessed by GenerateXandPt |
---|
1527 | // and some of them have been set to -2 or -3 |
---|
1528 | if( vec[i]->GetSide() == -1 ) |
---|
1529 | { |
---|
1530 | ++backwardCount; |
---|
1531 | backwardMass += vec[i]->GetMass()/GeV; |
---|
1532 | } |
---|
1533 | else |
---|
1534 | { |
---|
1535 | ++forwardCount; |
---|
1536 | forwardMass += vec[i]->GetMass()/GeV; |
---|
1537 | } |
---|
1538 | } |
---|
1539 | // |
---|
1540 | // nucleons and some pions from intranuclear cascade |
---|
1541 | // |
---|
1542 | G4double term1 = std::log(centerofmassEnergy*centerofmassEnergy); |
---|
1543 | if(term1 < 0) term1 = 0.0001; // making sure xtarg<0; |
---|
1544 | const G4double afc = 0.312 + 0.2 * std::log(term1); |
---|
1545 | G4double xtarg; |
---|
1546 | if( centerofmassEnergy < 2.0+G4UniformRand() ) // added +2 below, JLC 4Jul97 |
---|
1547 | xtarg = afc * (std::pow(atomicWeight,0.33)-1.0) * (2*backwardCount+vecLen+2)/2.0; |
---|
1548 | else |
---|
1549 | xtarg = afc * (std::pow(atomicWeight,0.33)-1.0) * (2*backwardCount); |
---|
1550 | if( xtarg <= 0.0 )xtarg = 0.01; |
---|
1551 | G4int nuclearExcitationCount = Poisson( xtarg ); |
---|
1552 | if(atomicWeight<1.0001) nuclearExcitationCount = 0; |
---|
1553 | G4int extraNucleonCount = 0; |
---|
1554 | G4double extraMass = 0.0; |
---|
1555 | G4double extraNucleonMass = 0.0; |
---|
1556 | if( nuclearExcitationCount > 0 ) |
---|
1557 | { |
---|
1558 | G4int momentumBin = std::min( 4, G4int(pOriginal/3.0) ); |
---|
1559 | const G4double nucsup[] = { 1.0, 0.8, 0.6, 0.5, 0.4 }; |
---|
1560 | // |
---|
1561 | // NOTE: in TWOCLU, these new particles were given negative codes |
---|
1562 | // here we use NewlyAdded = true instead |
---|
1563 | // |
---|
1564 | // G4ReactionProduct *pVec = new G4ReactionProduct [nuclearExcitationCount]; |
---|
1565 | for( i=0; i<nuclearExcitationCount; ++i ) |
---|
1566 | { |
---|
1567 | G4ReactionProduct* pVec = new G4ReactionProduct(); |
---|
1568 | if( G4UniformRand() < nucsup[momentumBin] ) // add proton or neutron |
---|
1569 | { |
---|
1570 | if( G4UniformRand() > 1.0-atomicNumber/atomicWeight ) |
---|
1571 | pVec->SetDefinition( aProton ); |
---|
1572 | else |
---|
1573 | pVec->SetDefinition( aNeutron ); |
---|
1574 | ++backwardNucleonCount; |
---|
1575 | ++extraNucleonCount; |
---|
1576 | extraNucleonMass += pVec->GetMass()/GeV; |
---|
1577 | } |
---|
1578 | else |
---|
1579 | { // add a pion |
---|
1580 | G4double ran = G4UniformRand(); |
---|
1581 | if( ran < 0.3181 ) |
---|
1582 | pVec->SetDefinition( aPiPlus ); |
---|
1583 | else if( ran < 0.6819 ) |
---|
1584 | pVec->SetDefinition( aPiZero ); |
---|
1585 | else |
---|
1586 | pVec->SetDefinition( aPiMinus ); |
---|
1587 | } |
---|
1588 | pVec->SetSide( -2 ); // backside particle |
---|
1589 | extraMass += pVec->GetMass()/GeV; |
---|
1590 | pVec->SetNewlyAdded( true ); |
---|
1591 | vec.SetElement( vecLen++, pVec ); |
---|
1592 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
1593 | } |
---|
1594 | } |
---|
1595 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
1596 | G4double forwardEnergy = (centerofmassEnergy-cMass-bMass)/2.0 +cMass - forwardMass; |
---|
1597 | G4double backwardEnergy = (centerofmassEnergy-cMass-bMass)/2.0 +bMass - backwardMass; |
---|
1598 | G4double eAvailable = centerofmassEnergy - (forwardMass+backwardMass); |
---|
1599 | G4bool secondaryDeleted; |
---|
1600 | G4double pMass; |
---|
1601 | |
---|
1602 | while( eAvailable <= 0.0 ) // must eliminate a particle |
---|
1603 | { |
---|
1604 | secondaryDeleted = false; |
---|
1605 | for( i=(vecLen-1); i>=0; --i ) |
---|
1606 | { |
---|
1607 | if( vec[i]->GetSide() == 1 && vec[i]->GetMayBeKilled()) |
---|
1608 | { |
---|
1609 | pMass = vec[i]->GetMass()/GeV; |
---|
1610 | for( G4int j=i; j<(vecLen-1); ++j )*vec[j] = *vec[j+1]; // shift up |
---|
1611 | --forwardCount; |
---|
1612 | forwardEnergy += pMass; |
---|
1613 | forwardMass -= pMass; |
---|
1614 | secondaryDeleted = true; |
---|
1615 | break; |
---|
1616 | } |
---|
1617 | else if( vec[i]->GetSide() == -1 && vec[i]->GetMayBeKilled()) |
---|
1618 | { |
---|
1619 | pMass = vec[i]->GetMass()/GeV; |
---|
1620 | for( G4int j=i; j<(vecLen-1); ++j )*vec[j] = *vec[j+1]; // shift up |
---|
1621 | --backwardCount; |
---|
1622 | backwardEnergy += pMass; |
---|
1623 | backwardMass -= pMass; |
---|
1624 | secondaryDeleted = true; |
---|
1625 | break; |
---|
1626 | } |
---|
1627 | } // breaks go down to here |
---|
1628 | if( secondaryDeleted ) |
---|
1629 | { |
---|
1630 | delete vec[vecLen-1]; |
---|
1631 | --vecLen; |
---|
1632 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
1633 | } |
---|
1634 | else |
---|
1635 | { |
---|
1636 | if( vecLen == 0 ) |
---|
1637 | { |
---|
1638 | return false; // all secondaries have been eliminated |
---|
1639 | } |
---|
1640 | if( targetParticle.GetSide() == -1 ) |
---|
1641 | { |
---|
1642 | pMass = targetParticle.GetMass()/GeV; |
---|
1643 | targetParticle = *vec[0]; |
---|
1644 | for( G4int j=0; j<(vecLen-1); ++j )*vec[j] = *vec[j+1]; // shift up |
---|
1645 | --backwardCount; |
---|
1646 | backwardEnergy += pMass; |
---|
1647 | backwardMass -= pMass; |
---|
1648 | secondaryDeleted = true; |
---|
1649 | } |
---|
1650 | else if( targetParticle.GetSide() == 1 ) |
---|
1651 | { |
---|
1652 | pMass = targetParticle.GetMass()/GeV; |
---|
1653 | targetParticle = *vec[0]; |
---|
1654 | for( G4int j=0; j<(vecLen-1); ++j )*vec[j] = *vec[j+1]; // shift up |
---|
1655 | --forwardCount; |
---|
1656 | forwardEnergy += pMass; |
---|
1657 | forwardMass -= pMass; |
---|
1658 | secondaryDeleted = true; |
---|
1659 | } |
---|
1660 | if( secondaryDeleted ) |
---|
1661 | { |
---|
1662 | delete vec[vecLen-1]; |
---|
1663 | --vecLen; |
---|
1664 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
1665 | } |
---|
1666 | else |
---|
1667 | { |
---|
1668 | if( currentParticle.GetSide() == -1 ) |
---|
1669 | { |
---|
1670 | pMass = currentParticle.GetMass()/GeV; |
---|
1671 | currentParticle = *vec[0]; |
---|
1672 | for( G4int j=0; j<(vecLen-1); ++j )*vec[j] = *vec[j+1]; // shift up |
---|
1673 | --backwardCount; |
---|
1674 | backwardEnergy += pMass; |
---|
1675 | backwardMass -= pMass; |
---|
1676 | secondaryDeleted = true; |
---|
1677 | } |
---|
1678 | else if( currentParticle.GetSide() == 1 ) |
---|
1679 | { |
---|
1680 | pMass = currentParticle.GetMass()/GeV; |
---|
1681 | currentParticle = *vec[0]; |
---|
1682 | for( G4int j=0; j<(vecLen-1); ++j )*vec[j] = *vec[j+1]; // shift up |
---|
1683 | --forwardCount; |
---|
1684 | forwardEnergy += pMass; |
---|
1685 | forwardMass -= pMass; |
---|
1686 | secondaryDeleted = true; |
---|
1687 | } |
---|
1688 | if( secondaryDeleted ) |
---|
1689 | { |
---|
1690 | delete vec[vecLen-1]; |
---|
1691 | --vecLen; |
---|
1692 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
1693 | } |
---|
1694 | else break; |
---|
1695 | } |
---|
1696 | } |
---|
1697 | eAvailable = centerofmassEnergy - (forwardMass+backwardMass); |
---|
1698 | } |
---|
1699 | // |
---|
1700 | // This is the start of the TwoCluster function |
---|
1701 | // Choose masses for the 3 clusters: |
---|
1702 | // forward cluster |
---|
1703 | // backward meson cluster |
---|
1704 | // backward nucleon cluster |
---|
1705 | // |
---|
1706 | G4double rmc = 0.0, rmd = 0.0; |
---|
1707 | const G4double cpar[] = { 0.6, 0.6, 0.35, 0.15, 0.10 }; |
---|
1708 | const G4double gpar[] = { 2.6, 2.6, 1.8, 1.30, 1.20 }; |
---|
1709 | |
---|
1710 | if (forwardCount <= 0 || backwardCount <= 0) return false; // array bounds protection |
---|
1711 | |
---|
1712 | if (forwardCount == 1) rmc = forwardMass; |
---|
1713 | else |
---|
1714 | { |
---|
1715 | G4int ntc = std::max(1, std::min(5,forwardCount))-1; // check if offset by 1 @@ |
---|
1716 | rmc = forwardMass + std::pow(-std::log(1.0-G4UniformRand()),cpar[ntc-1])/gpar[ntc-1]; |
---|
1717 | } |
---|
1718 | |
---|
1719 | if (backwardCount == 1) rmd = backwardMass; |
---|
1720 | else |
---|
1721 | { |
---|
1722 | G4int ntc = std::max(1, std::min(5,backwardCount)); // check, if offfset by 1 @@ |
---|
1723 | rmd = backwardMass + std::pow(-std::log(1.0-G4UniformRand()),cpar[ntc-1])/gpar[ntc-1]; |
---|
1724 | } |
---|
1725 | |
---|
1726 | while( rmc+rmd > centerofmassEnergy ) |
---|
1727 | { |
---|
1728 | if( (rmc <= forwardMass) && (rmd <= backwardMass) ) |
---|
1729 | { |
---|
1730 | G4double temp = 0.999*centerofmassEnergy/(rmc+rmd); |
---|
1731 | rmc *= temp; |
---|
1732 | rmd *= temp; |
---|
1733 | } |
---|
1734 | else |
---|
1735 | { |
---|
1736 | rmc = 0.1*forwardMass + 0.9*rmc; |
---|
1737 | rmd = 0.1*backwardMass + 0.9*rmd; |
---|
1738 | } |
---|
1739 | } |
---|
1740 | |
---|
1741 | G4ReactionProduct pseudoParticle[8]; |
---|
1742 | for( i=0; i<8; ++i )pseudoParticle[i].SetZero(); |
---|
1743 | |
---|
1744 | pseudoParticle[1].SetMass( mOriginal*GeV ); |
---|
1745 | pseudoParticle[1].SetTotalEnergy( etOriginal*GeV ); |
---|
1746 | pseudoParticle[1].SetMomentum( 0.0, 0.0, pOriginal*GeV ); |
---|
1747 | |
---|
1748 | pseudoParticle[2].SetMass( protonMass*MeV ); |
---|
1749 | pseudoParticle[2].SetTotalEnergy( protonMass*MeV ); |
---|
1750 | pseudoParticle[2].SetMomentum( 0.0, 0.0, 0.0 ); |
---|
1751 | // |
---|
1752 | // transform into centre of mass system |
---|
1753 | // |
---|
1754 | pseudoParticle[0] = pseudoParticle[1] + pseudoParticle[2]; |
---|
1755 | pseudoParticle[1].Lorentz( pseudoParticle[1], pseudoParticle[0] ); |
---|
1756 | pseudoParticle[2].Lorentz( pseudoParticle[2], pseudoParticle[0] ); |
---|
1757 | |
---|
1758 | const G4double pfMin = 0.0001; |
---|
1759 | G4double pf = (centerofmassEnergy*centerofmassEnergy+rmd*rmd-rmc*rmc); |
---|
1760 | pf *= pf; |
---|
1761 | pf -= 4*centerofmassEnergy*centerofmassEnergy*rmd*rmd; |
---|
1762 | pf = std::sqrt( std::max(pf,pfMin) )/(2.0*centerofmassEnergy); |
---|
1763 | // |
---|
1764 | // set final state masses and energies in centre of mass system |
---|
1765 | // |
---|
1766 | pseudoParticle[3].SetMass( rmc*GeV ); |
---|
1767 | pseudoParticle[3].SetTotalEnergy( std::sqrt(pf*pf+rmc*rmc)*GeV ); |
---|
1768 | |
---|
1769 | pseudoParticle[4].SetMass( rmd*GeV ); |
---|
1770 | pseudoParticle[4].SetTotalEnergy( std::sqrt(pf*pf+rmd*rmd)*GeV ); |
---|
1771 | // |
---|
1772 | // set |T| and |TMIN| |
---|
1773 | // |
---|
1774 | const G4double bMin = 0.01; |
---|
1775 | const G4double b1 = 4.0; |
---|
1776 | const G4double b2 = 1.6; |
---|
1777 | |
---|
1778 | G4double pin = pseudoParticle[1].GetMomentum().mag()/GeV; |
---|
1779 | G4double dtb = 4.0*pin*pf*std::max( bMin, b1+b2*std::log(pOriginal) ); |
---|
1780 | G4double factor = 1.0 - std::exp(-dtb); |
---|
1781 | G4double costheta = 1.0 + 2.0*std::log(1.0 - G4UniformRand()*factor) / dtb; |
---|
1782 | costheta = std::max(-1.0, std::min(1.0, costheta)); |
---|
1783 | G4double sintheta = std::sqrt(1.0-costheta*costheta); |
---|
1784 | G4double phi = G4UniformRand() * twopi; |
---|
1785 | |
---|
1786 | // |
---|
1787 | // calculate final state momenta in centre of mass system |
---|
1788 | // |
---|
1789 | pseudoParticle[3].SetMomentum( pf*sintheta*std::cos(phi)*GeV, |
---|
1790 | pf*sintheta*std::sin(phi)*GeV, |
---|
1791 | pf*costheta*GeV ); |
---|
1792 | |
---|
1793 | pseudoParticle[4].SetMomentum( pseudoParticle[3].GetMomentum() * (-1.0) ); |
---|
1794 | // |
---|
1795 | // simulate backward nucleon cluster in lab. system and transform in cms |
---|
1796 | // |
---|
1797 | G4double pp, pp1; |
---|
1798 | if( nuclearExcitationCount > 0 ) |
---|
1799 | { |
---|
1800 | const G4double ga = 1.2; |
---|
1801 | G4double ekit1 = 0.04; |
---|
1802 | G4double ekit2 = 0.6; |
---|
1803 | if( ekOriginal <= 5.0 ) |
---|
1804 | { |
---|
1805 | ekit1 *= ekOriginal*ekOriginal/25.0; |
---|
1806 | ekit2 *= ekOriginal*ekOriginal/25.0; |
---|
1807 | } |
---|
1808 | const G4double a = (1.0-ga)/(std::pow(ekit2,(1.0-ga)) - std::pow(ekit1,(1.0-ga))); |
---|
1809 | for( i=0; i<vecLen; ++i ) |
---|
1810 | { |
---|
1811 | if( vec[i]->GetSide() == -2 ) |
---|
1812 | { |
---|
1813 | G4double kineticE = |
---|
1814 | std::pow( (G4UniformRand()*(1.0-ga)/a+std::pow(ekit1,(1.0-ga))), (1.0/(1.0-ga)) ); |
---|
1815 | vec[i]->SetKineticEnergy( kineticE*GeV ); |
---|
1816 | G4double vMass = vec[i]->GetMass()/MeV; |
---|
1817 | G4double totalE = kineticE*GeV + vMass; |
---|
1818 | pp = std::sqrt( std::abs(totalE*totalE-vMass*vMass) ); |
---|
1819 | G4double cost = std::min( 1.0, std::max( -1.0, std::log(2.23*G4UniformRand()+0.383)/0.96 ) ); |
---|
1820 | G4double sint = std::sqrt( std::max( 0.0, (1.0-cost*cost) ) ); |
---|
1821 | phi = twopi*G4UniformRand(); |
---|
1822 | vec[i]->SetMomentum( pp*sint*std::sin(phi)*MeV, |
---|
1823 | pp*sint*std::cos(phi)*MeV, |
---|
1824 | pp*cost*MeV ); |
---|
1825 | vec[i]->Lorentz( *vec[i], pseudoParticle[0] ); |
---|
1826 | } |
---|
1827 | } |
---|
1828 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
1829 | } |
---|
1830 | // |
---|
1831 | // fragmentation of forward cluster and backward meson cluster |
---|
1832 | // |
---|
1833 | currentParticle.SetMomentum( pseudoParticle[3].GetMomentum() ); |
---|
1834 | currentParticle.SetTotalEnergy( pseudoParticle[3].GetTotalEnergy() ); |
---|
1835 | |
---|
1836 | targetParticle.SetMomentum( pseudoParticle[4].GetMomentum() ); |
---|
1837 | targetParticle.SetTotalEnergy( pseudoParticle[4].GetTotalEnergy() ); |
---|
1838 | |
---|
1839 | pseudoParticle[5].SetMomentum( pseudoParticle[3].GetMomentum() * (-1.0) ); |
---|
1840 | pseudoParticle[5].SetMass( pseudoParticle[3].GetMass() ); |
---|
1841 | pseudoParticle[5].SetTotalEnergy( pseudoParticle[3].GetTotalEnergy() ); |
---|
1842 | |
---|
1843 | pseudoParticle[6].SetMomentum( pseudoParticle[4].GetMomentum() * (-1.0) ); |
---|
1844 | pseudoParticle[6].SetMass( pseudoParticle[4].GetMass() ); |
---|
1845 | pseudoParticle[6].SetTotalEnergy( pseudoParticle[4].GetTotalEnergy() ); |
---|
1846 | |
---|
1847 | G4double wgt; |
---|
1848 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
1849 | if( forwardCount > 1 ) // tempV will contain the forward particles |
---|
1850 | { |
---|
1851 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> tempV; |
---|
1852 | tempV.Initialize( forwardCount ); |
---|
1853 | G4bool constantCrossSection = true; |
---|
1854 | G4int tempLen = 0; |
---|
1855 | if( currentParticle.GetSide() == 1 ) |
---|
1856 | tempV.SetElement( tempLen++, ¤tParticle ); |
---|
1857 | if( targetParticle.GetSide() == 1 ) |
---|
1858 | tempV.SetElement( tempLen++, &targetParticle ); |
---|
1859 | for( i=0; i<vecLen; ++i ) |
---|
1860 | { |
---|
1861 | if( vec[i]->GetSide() == 1 ) |
---|
1862 | { |
---|
1863 | if( tempLen < 18 ) |
---|
1864 | tempV.SetElement( tempLen++, vec[i] ); |
---|
1865 | else |
---|
1866 | { |
---|
1867 | vec[i]->SetSide( -1 ); |
---|
1868 | continue; |
---|
1869 | } |
---|
1870 | } |
---|
1871 | } |
---|
1872 | if( tempLen >= 2 ) |
---|
1873 | { |
---|
1874 | wgt = GenerateNBodyEvent( pseudoParticle[3].GetMass()/MeV, |
---|
1875 | constantCrossSection, tempV, tempLen ); |
---|
1876 | if( currentParticle.GetSide() == 1 ) |
---|
1877 | currentParticle.Lorentz( currentParticle, pseudoParticle[5] ); |
---|
1878 | if( targetParticle.GetSide() == 1 ) |
---|
1879 | targetParticle.Lorentz( targetParticle, pseudoParticle[5] ); |
---|
1880 | for( i=0; i<vecLen; ++i ) |
---|
1881 | { |
---|
1882 | if( vec[i]->GetSide() == 1 )vec[i]->Lorentz( *vec[i], pseudoParticle[5] ); |
---|
1883 | } |
---|
1884 | } |
---|
1885 | } |
---|
1886 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
1887 | if( backwardCount > 1 ) // tempV will contain the backward particles, |
---|
1888 | { // but not those created from the intranuclear cascade |
---|
1889 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> tempV; |
---|
1890 | tempV.Initialize( backwardCount ); |
---|
1891 | G4bool constantCrossSection = true; |
---|
1892 | G4int tempLen = 0; |
---|
1893 | if( currentParticle.GetSide() == -1 ) |
---|
1894 | tempV.SetElement( tempLen++, ¤tParticle ); |
---|
1895 | if( targetParticle.GetSide() == -1 ) |
---|
1896 | tempV.SetElement( tempLen++, &targetParticle ); |
---|
1897 | for( i=0; i<vecLen; ++i ) |
---|
1898 | { |
---|
1899 | if( vec[i]->GetSide() == -1 ) |
---|
1900 | { |
---|
1901 | if( tempLen < 18 ) |
---|
1902 | tempV.SetElement( tempLen++, vec[i] ); |
---|
1903 | else |
---|
1904 | { |
---|
1905 | vec[i]->SetSide( -2 ); |
---|
1906 | vec[i]->SetKineticEnergy( 0.0 ); |
---|
1907 | vec[i]->SetMomentum( 0.0, 0.0, 0.0 ); |
---|
1908 | continue; |
---|
1909 | } |
---|
1910 | } |
---|
1911 | } |
---|
1912 | if( tempLen >= 2 ) |
---|
1913 | { |
---|
1914 | wgt = GenerateNBodyEvent( pseudoParticle[4].GetMass()/MeV, |
---|
1915 | constantCrossSection, tempV, tempLen ); |
---|
1916 | if( currentParticle.GetSide() == -1 ) |
---|
1917 | currentParticle.Lorentz( currentParticle, pseudoParticle[6] ); |
---|
1918 | if( targetParticle.GetSide() == -1 ) |
---|
1919 | targetParticle.Lorentz( targetParticle, pseudoParticle[6] ); |
---|
1920 | for( i=0; i<vecLen; ++i ) |
---|
1921 | { |
---|
1922 | if( vec[i]->GetSide() == -1 )vec[i]->Lorentz( *vec[i], pseudoParticle[6] ); |
---|
1923 | } |
---|
1924 | } |
---|
1925 | } |
---|
1926 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
1927 | // |
---|
1928 | // Lorentz transformation in lab system |
---|
1929 | // |
---|
1930 | currentParticle.Lorentz( currentParticle, pseudoParticle[2] ); |
---|
1931 | targetParticle.Lorentz( targetParticle, pseudoParticle[2] ); |
---|
1932 | for( i=0; i<vecLen; ++i ) vec[i]->Lorentz( *vec[i], pseudoParticle[2] ); |
---|
1933 | |
---|
1934 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
1935 | // |
---|
1936 | // sometimes the leading strange particle is lost, set it back |
---|
1937 | // |
---|
1938 | G4bool dum = true; |
---|
1939 | if( leadFlag ) |
---|
1940 | { |
---|
1941 | // leadFlag will be true |
---|
1942 | // iff original particle is at least as heavy as K+ and not a proton or |
---|
1943 | // neutron AND if incident particle is at least as heavy as K+ and it is |
---|
1944 | // not a proton or neutron leadFlag is set to the incident particle |
---|
1945 | // or |
---|
1946 | // target particle is at least as heavy as K+ and it is not a proton or |
---|
1947 | // neutron leadFlag is set to the target particle |
---|
1948 | // |
---|
1949 | if( currentParticle.GetDefinition() == leadingStrangeParticle.GetDefinition() ) |
---|
1950 | dum = false; |
---|
1951 | else if( targetParticle.GetDefinition() == leadingStrangeParticle.GetDefinition() ) |
---|
1952 | dum = false; |
---|
1953 | else |
---|
1954 | { |
---|
1955 | for( i=0; i<vecLen; ++i ) |
---|
1956 | { |
---|
1957 | if( vec[i]->GetDefinition() == leadingStrangeParticle.GetDefinition() ) |
---|
1958 | { |
---|
1959 | dum = false; |
---|
1960 | break; |
---|
1961 | } |
---|
1962 | } |
---|
1963 | } |
---|
1964 | if( dum ) |
---|
1965 | { |
---|
1966 | G4double leadMass = leadingStrangeParticle.GetMass()/MeV; |
---|
1967 | G4double ekin; |
---|
1968 | if( ((leadMass < protonMass) && (targetParticle.GetMass()/MeV < protonMass)) || |
---|
1969 | ((leadMass >= protonMass) && (targetParticle.GetMass()/MeV >= protonMass)) ) |
---|
1970 | { |
---|
1971 | ekin = targetParticle.GetKineticEnergy()/GeV; |
---|
1972 | pp1 = targetParticle.GetMomentum().mag()/MeV; // old momentum |
---|
1973 | targetParticle.SetDefinition( leadingStrangeParticle.GetDefinition() ); |
---|
1974 | targetParticle.SetKineticEnergy( ekin*GeV ); |
---|
1975 | pp = targetParticle.GetTotalMomentum()/MeV; // new momentum |
---|
1976 | if( pp1 < 1.0e-3 ) |
---|
1977 | { |
---|
1978 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
1979 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
1980 | G4double phi = twopi*G4UniformRand(); |
---|
1981 | targetParticle.SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
1982 | pp*sintheta*std::sin(phi)*MeV, |
---|
1983 | pp*costheta*MeV ) ; |
---|
1984 | } |
---|
1985 | else |
---|
1986 | targetParticle.SetMomentum( targetParticle.GetMomentum() * (pp/pp1) ); |
---|
1987 | |
---|
1988 | targetHasChanged = true; |
---|
1989 | } |
---|
1990 | else |
---|
1991 | { |
---|
1992 | ekin = currentParticle.GetKineticEnergy()/GeV; |
---|
1993 | pp1 = currentParticle.GetMomentum().mag()/MeV; |
---|
1994 | currentParticle.SetDefinition( leadingStrangeParticle.GetDefinition() ); |
---|
1995 | currentParticle.SetKineticEnergy( ekin*GeV ); |
---|
1996 | pp = currentParticle.GetTotalMomentum()/MeV; |
---|
1997 | if( pp1 < 1.0e-3 ) |
---|
1998 | { |
---|
1999 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
2000 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
2001 | G4double phi = twopi*G4UniformRand(); |
---|
2002 | currentParticle.SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
2003 | pp*sintheta*std::sin(phi)*MeV, |
---|
2004 | pp*costheta*MeV ) ; |
---|
2005 | } |
---|
2006 | else |
---|
2007 | currentParticle.SetMomentum( currentParticle.GetMomentum() * (pp/pp1) ); |
---|
2008 | |
---|
2009 | incidentHasChanged = true; |
---|
2010 | } |
---|
2011 | } |
---|
2012 | } // end of if( leadFlag ) |
---|
2013 | |
---|
2014 | // Get number of final state nucleons and nucleons remaining in |
---|
2015 | // target nucleus |
---|
2016 | |
---|
2017 | std::pair<G4int, G4int> finalStateNucleons = |
---|
2018 | GetFinalStateNucleons(originalTarget, vec, vecLen); |
---|
2019 | |
---|
2020 | G4int protonsInFinalState = finalStateNucleons.first; |
---|
2021 | G4int neutronsInFinalState = finalStateNucleons.second; |
---|
2022 | |
---|
2023 | G4int numberofFinalStateNucleons = |
---|
2024 | protonsInFinalState + neutronsInFinalState; |
---|
2025 | |
---|
2026 | if (currentParticle.GetDefinition()->GetBaryonNumber() == 1 && |
---|
2027 | targetParticle.GetDefinition()->GetBaryonNumber() == 1 && |
---|
2028 | originalIncident->GetDefinition()->GetPDGMass() < |
---|
2029 | G4Lambda::Lambda()->GetPDGMass()) |
---|
2030 | numberofFinalStateNucleons++; |
---|
2031 | |
---|
2032 | numberofFinalStateNucleons = std::max(1, numberofFinalStateNucleons); |
---|
2033 | |
---|
2034 | G4int PinNucleus = std::max(0, |
---|
2035 | targetNucleus.GetZ_asInt() - protonsInFinalState); |
---|
2036 | G4int NinNucleus = std::max(0, |
---|
2037 | targetNucleus.GetN_asInt() - neutronsInFinalState); |
---|
2038 | // |
---|
2039 | // for various reasons, the energy balance is not sufficient, |
---|
2040 | // check that, energy balance, angle of final system, etc. |
---|
2041 | // |
---|
2042 | pseudoParticle[4].SetMass( mOriginal*GeV ); |
---|
2043 | pseudoParticle[4].SetTotalEnergy( etOriginal*GeV ); |
---|
2044 | pseudoParticle[4].SetMomentum( 0.0, 0.0, pOriginal*GeV ); |
---|
2045 | |
---|
2046 | G4ParticleDefinition * aOrgDef = modifiedOriginal.GetDefinition(); |
---|
2047 | G4int diff = 0; |
---|
2048 | if(aOrgDef == G4Proton::Proton() || aOrgDef == G4Neutron::Neutron() ) diff = 1; |
---|
2049 | if(numberofFinalStateNucleons == 1) diff = 0; |
---|
2050 | pseudoParticle[5].SetMomentum( 0.0, 0.0, 0.0 ); |
---|
2051 | pseudoParticle[5].SetMass( protonMass*(numberofFinalStateNucleons-diff)*MeV); |
---|
2052 | pseudoParticle[5].SetTotalEnergy( protonMass*(numberofFinalStateNucleons-diff)*MeV); |
---|
2053 | |
---|
2054 | G4double theoreticalKinetic = |
---|
2055 | pseudoParticle[4].GetTotalEnergy()/GeV + pseudoParticle[5].GetTotalEnergy()/GeV; |
---|
2056 | |
---|
2057 | pseudoParticle[6] = pseudoParticle[4] + pseudoParticle[5]; |
---|
2058 | pseudoParticle[4].Lorentz( pseudoParticle[4], pseudoParticle[6] ); |
---|
2059 | pseudoParticle[5].Lorentz( pseudoParticle[5], pseudoParticle[6] ); |
---|
2060 | |
---|
2061 | if( vecLen < 16 ) |
---|
2062 | { |
---|
2063 | G4ReactionProduct tempR[130]; |
---|
2064 | tempR[0] = currentParticle; |
---|
2065 | tempR[1] = targetParticle; |
---|
2066 | for( i=0; i<vecLen; ++i )tempR[i+2] = *vec[i]; |
---|
2067 | |
---|
2068 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> tempV; |
---|
2069 | tempV.Initialize( vecLen+2 ); |
---|
2070 | G4bool constantCrossSection = true; |
---|
2071 | G4int tempLen = 0; |
---|
2072 | for( i=0; i<vecLen+2; ++i )tempV.SetElement( tempLen++, &tempR[i] ); |
---|
2073 | |
---|
2074 | if( tempLen >= 2 ) |
---|
2075 | { |
---|
2076 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
2077 | wgt = GenerateNBodyEvent( pseudoParticle[4].GetTotalEnergy()/MeV + |
---|
2078 | pseudoParticle[5].GetTotalEnergy()/MeV, |
---|
2079 | constantCrossSection, tempV, tempLen ); |
---|
2080 | if (wgt == -1) { |
---|
2081 | G4double Qvalue = 0; |
---|
2082 | for (i = 0; i < tempLen; i++) Qvalue += tempV[i]->GetMass(); |
---|
2083 | wgt = GenerateNBodyEvent( Qvalue/MeV, |
---|
2084 | constantCrossSection, tempV, tempLen ); |
---|
2085 | } |
---|
2086 | theoreticalKinetic = 0.0; |
---|
2087 | for( i=0; i<vecLen+2; ++i ) |
---|
2088 | { |
---|
2089 | pseudoParticle[7].SetMomentum( tempV[i]->GetMomentum() ); |
---|
2090 | pseudoParticle[7].SetMass( tempV[i]->GetMass() ); |
---|
2091 | pseudoParticle[7].SetTotalEnergy( tempV[i]->GetTotalEnergy() ); |
---|
2092 | pseudoParticle[7].Lorentz( pseudoParticle[7], pseudoParticle[5] ); |
---|
2093 | theoreticalKinetic += pseudoParticle[7].GetKineticEnergy()/GeV; |
---|
2094 | } |
---|
2095 | } |
---|
2096 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
2097 | } |
---|
2098 | else |
---|
2099 | { |
---|
2100 | theoreticalKinetic -= |
---|
2101 | ( currentParticle.GetMass()/GeV + targetParticle.GetMass()/GeV ); |
---|
2102 | for( i=0; i<vecLen; ++i )theoreticalKinetic -= vec[i]->GetMass()/GeV; |
---|
2103 | } |
---|
2104 | G4double simulatedKinetic = |
---|
2105 | currentParticle.GetKineticEnergy()/GeV + targetParticle.GetKineticEnergy()/GeV; |
---|
2106 | for( i=0; i<vecLen; ++i )simulatedKinetic += vec[i]->GetKineticEnergy()/GeV; |
---|
2107 | // |
---|
2108 | // make sure that kinetic energies are correct |
---|
2109 | // the backward nucleon cluster is not produced within proper kinematics!!! |
---|
2110 | // |
---|
2111 | |
---|
2112 | if( simulatedKinetic != 0.0 ) |
---|
2113 | { |
---|
2114 | wgt = (theoreticalKinetic)/simulatedKinetic; |
---|
2115 | currentParticle.SetKineticEnergy( wgt*currentParticle.GetKineticEnergy() ); |
---|
2116 | pp = currentParticle.GetTotalMomentum()/MeV; |
---|
2117 | pp1 = currentParticle.GetMomentum().mag()/MeV; |
---|
2118 | if( pp1 < 0.001*MeV ) |
---|
2119 | { |
---|
2120 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
2121 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
2122 | G4double phi = twopi*G4UniformRand(); |
---|
2123 | currentParticle.SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
2124 | pp*sintheta*std::sin(phi)*MeV, |
---|
2125 | pp*costheta*MeV ) ; |
---|
2126 | } |
---|
2127 | else |
---|
2128 | currentParticle.SetMomentum( currentParticle.GetMomentum() * (pp/pp1) ); |
---|
2129 | |
---|
2130 | targetParticle.SetKineticEnergy( wgt*targetParticle.GetKineticEnergy() ); |
---|
2131 | pp = targetParticle.GetTotalMomentum()/MeV; |
---|
2132 | pp1 = targetParticle.GetMomentum().mag()/MeV; |
---|
2133 | if( pp1 < 0.001*MeV ) |
---|
2134 | { |
---|
2135 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
2136 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
2137 | G4double phi = twopi*G4UniformRand(); |
---|
2138 | targetParticle.SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
2139 | pp*sintheta*std::sin(phi)*MeV, |
---|
2140 | pp*costheta*MeV ) ; |
---|
2141 | } |
---|
2142 | else |
---|
2143 | targetParticle.SetMomentum( targetParticle.GetMomentum() * (pp/pp1) ); |
---|
2144 | |
---|
2145 | for( i=0; i<vecLen; ++i ) |
---|
2146 | { |
---|
2147 | vec[i]->SetKineticEnergy( wgt*vec[i]->GetKineticEnergy() ); |
---|
2148 | pp = vec[i]->GetTotalMomentum()/MeV; |
---|
2149 | pp1 = vec[i]->GetMomentum().mag()/MeV; |
---|
2150 | if( pp1 < 0.001 ) |
---|
2151 | { |
---|
2152 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
2153 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
2154 | G4double phi = twopi*G4UniformRand(); |
---|
2155 | vec[i]->SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
2156 | pp*sintheta*std::sin(phi)*MeV, |
---|
2157 | pp*costheta*MeV ) ; |
---|
2158 | } |
---|
2159 | else |
---|
2160 | vec[i]->SetMomentum( vec[i]->GetMomentum() * (pp/pp1) ); |
---|
2161 | } |
---|
2162 | } |
---|
2163 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
2164 | |
---|
2165 | Rotate( numberofFinalStateNucleons, pseudoParticle[4].GetMomentum(), |
---|
2166 | modifiedOriginal, originalIncident, targetNucleus, |
---|
2167 | currentParticle, targetParticle, vec, vecLen ); |
---|
2168 | // |
---|
2169 | // add black track particles |
---|
2170 | // the total number of particles produced is restricted to 198 |
---|
2171 | // this may have influence on very high energies |
---|
2172 | // |
---|
2173 | if( atomicWeight >= 1.5 ) |
---|
2174 | { |
---|
2175 | // npnb is number of proton/neutron black track particles |
---|
2176 | // ndta is the number of deuterons, tritons, and alphas produced |
---|
2177 | // epnb is the kinetic energy available for proton/neutron black track |
---|
2178 | // particles |
---|
2179 | // edta is the kinetic energy available for deuteron/triton/alpha |
---|
2180 | // particles |
---|
2181 | |
---|
2182 | G4int npnb = 0; |
---|
2183 | G4int ndta = 0; |
---|
2184 | |
---|
2185 | G4double epnb, edta; |
---|
2186 | if (veryForward) { |
---|
2187 | epnb = targetNucleus.GetAnnihilationPNBlackTrackEnergy(); |
---|
2188 | edta = targetNucleus.GetAnnihilationDTABlackTrackEnergy(); |
---|
2189 | } else { |
---|
2190 | epnb = targetNucleus.GetPNBlackTrackEnergy(); |
---|
2191 | edta = targetNucleus.GetDTABlackTrackEnergy(); |
---|
2192 | } |
---|
2193 | |
---|
2194 | const G4double pnCutOff = 0.001; // GeV |
---|
2195 | const G4double dtaCutOff = 0.001; // GeV |
---|
2196 | const G4double kineticMinimum = 1.e-6; |
---|
2197 | const G4double kineticFactor = -0.005; |
---|
2198 | |
---|
2199 | G4double sprob = 0.0; // sprob = probability of self-absorption in |
---|
2200 | // heavy molecules |
---|
2201 | const G4double ekIncident = originalIncident->GetKineticEnergy()/GeV; |
---|
2202 | if( ekIncident >= 5.0 )sprob = std::min( 1.0, 0.6*std::log(ekIncident-4.0) ); |
---|
2203 | |
---|
2204 | if( epnb >= pnCutOff ) |
---|
2205 | { |
---|
2206 | npnb = Poisson((1.5+1.25*numberofFinalStateNucleons)*epnb/(epnb+edta)); |
---|
2207 | if( numberofFinalStateNucleons + npnb > atomicWeight ) |
---|
2208 | npnb = G4int(atomicWeight - numberofFinalStateNucleons); |
---|
2209 | npnb = std::min( npnb, 127-vecLen ); |
---|
2210 | } |
---|
2211 | if( edta >= dtaCutOff ) |
---|
2212 | { |
---|
2213 | ndta = Poisson( (1.5+1.25*numberofFinalStateNucleons)*edta/(epnb+edta) ); |
---|
2214 | ndta = std::min( ndta, 127-vecLen ); |
---|
2215 | } |
---|
2216 | if (npnb == 0 && ndta == 0) npnb = 1; |
---|
2217 | |
---|
2218 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
2219 | |
---|
2220 | AddBlackTrackParticles(epnb, npnb, edta, ndta, sprob, kineticMinimum, |
---|
2221 | kineticFactor, modifiedOriginal, |
---|
2222 | PinNucleus, NinNucleus, targetNucleus, |
---|
2223 | vec, vecLen ); |
---|
2224 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
2225 | } |
---|
2226 | //if( centerofmassEnergy <= (4.0+G4UniformRand()) ) |
---|
2227 | // MomentumCheck( modifiedOriginal, currentParticle, targetParticle, vec, vecLen ); |
---|
2228 | // |
---|
2229 | // calculate time delay for nuclear reactions |
---|
2230 | // |
---|
2231 | if( (atomicWeight >= 1.5) && (atomicWeight <= 230.0) && (ekOriginal <= 0.2) ) |
---|
2232 | currentParticle.SetTOF( 1.0-500.0*std::exp(-ekOriginal/0.04)*std::log(G4UniformRand()) ); |
---|
2233 | else |
---|
2234 | currentParticle.SetTOF( 1.0 ); |
---|
2235 | |
---|
2236 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
2237 | return true; |
---|
2238 | } |
---|
2239 | |
---|
2240 | void G4ReactionDynamics::TwoBody( |
---|
2241 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> &vec, |
---|
2242 | G4int &vecLen, |
---|
2243 | G4ReactionProduct &modifiedOriginal, |
---|
2244 | const G4DynamicParticle* originalTarget, |
---|
2245 | G4ReactionProduct ¤tParticle, |
---|
2246 | G4ReactionProduct &targetParticle, |
---|
2247 | const G4Nucleus &targetNucleus, |
---|
2248 | G4bool &/* targetHasChanged*/ ) |
---|
2249 | { |
---|
2250 | // |
---|
2251 | // derived from original FORTRAN code TWOB by H. Fesefeldt (15-Sep-1987) |
---|
2252 | // |
---|
2253 | // Generation of momenta for elastic and quasi-elastic 2 body reactions |
---|
2254 | // |
---|
2255 | // The simple formula ds/d|t| = s0* std::exp(-b*|t|) is used. |
---|
2256 | // The b values are parametrizations from experimental data. |
---|
2257 | // Not available values are taken from those of similar reactions. |
---|
2258 | // |
---|
2259 | |
---|
2260 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
2261 | static const G4double expxu = 82.; // upper bound for arg. of exp |
---|
2262 | static const G4double expxl = -expxu; // lower bound for arg. of exp |
---|
2263 | |
---|
2264 | const G4double ekOriginal = modifiedOriginal.GetKineticEnergy()/GeV; |
---|
2265 | const G4double etOriginal = modifiedOriginal.GetTotalEnergy()/GeV; |
---|
2266 | const G4double mOriginal = modifiedOriginal.GetMass()/GeV; |
---|
2267 | const G4double pOriginal = modifiedOriginal.GetMomentum().mag()/GeV; |
---|
2268 | G4double currentMass = currentParticle.GetMass()/GeV; |
---|
2269 | G4double targetMass = targetParticle.GetDefinition()->GetPDGMass()/GeV; |
---|
2270 | |
---|
2271 | targetMass = targetParticle.GetMass()/GeV; |
---|
2272 | const G4double atomicWeight = G4double(targetNucleus.GetA_asInt()); |
---|
2273 | |
---|
2274 | G4double etCurrent = currentParticle.GetTotalEnergy()/GeV; |
---|
2275 | G4double pCurrent = currentParticle.GetTotalMomentum()/GeV; |
---|
2276 | |
---|
2277 | G4double cmEnergy = std::sqrt( currentMass*currentMass + |
---|
2278 | targetMass*targetMass + |
---|
2279 | 2.0*targetMass*etCurrent ); // in GeV |
---|
2280 | |
---|
2281 | //if( (pOriginal < 0.1) || |
---|
2282 | // (centerofmassEnergy < 0.01) ) // 2-body scattering not possible |
---|
2283 | // Continue with original particle, but spend the nuclear evaporation energy |
---|
2284 | // targetParticle.SetMass( 0.0 ); // flag that the target doesn't exist |
---|
2285 | //else // Two-body scattering is possible |
---|
2286 | |
---|
2287 | if( (pCurrent < 0.1) || (cmEnergy < 0.01) ) // 2-body scattering not possible |
---|
2288 | { |
---|
2289 | targetParticle.SetMass( 0.0 ); // flag that the target particle doesn't exist |
---|
2290 | } |
---|
2291 | else |
---|
2292 | { |
---|
2293 | // moved this if-block to a later stage, i.e. to the assignment of the scattering angle |
---|
2294 | // @@@@@ double-check. |
---|
2295 | // if (targetParticle.GetDefinition()->GetParticleSubType() == "kaon" || |
---|
2296 | // targetParticle.GetDefinition()->GetParticleSubType() == "pi") { |
---|
2297 | // if( G4UniformRand() < 0.5 ) |
---|
2298 | // targetParticle.SetDefinitionAndUpdateE( aNeutron ); |
---|
2299 | // else |
---|
2300 | // targetParticle.SetDefinitionAndUpdateE( aProton ); |
---|
2301 | // targetHasChanged = true; |
---|
2302 | // targetMass = targetParticle.GetMass()/GeV; |
---|
2303 | // } |
---|
2304 | // |
---|
2305 | // Set masses and momenta for final state particles |
---|
2306 | // |
---|
2307 | G4double pf = cmEnergy*cmEnergy + targetMass*targetMass - currentMass*currentMass; |
---|
2308 | pf = pf*pf - 4*cmEnergy*cmEnergy*targetMass*targetMass; |
---|
2309 | |
---|
2310 | if( pf < 0.001 ) |
---|
2311 | { |
---|
2312 | for(G4int i=0; i<vecLen; i++) delete vec[i]; |
---|
2313 | vecLen = 0; |
---|
2314 | throw G4HadronicException(__FILE__, __LINE__, "G4ReactionDynamics::TwoBody: pf is too small "); |
---|
2315 | } |
---|
2316 | |
---|
2317 | pf = std::sqrt( pf ) / ( 2.0*cmEnergy ); |
---|
2318 | // |
---|
2319 | // Set beam and target in centre of mass system |
---|
2320 | // |
---|
2321 | G4ReactionProduct pseudoParticle[3]; |
---|
2322 | |
---|
2323 | if (targetParticle.GetDefinition()->GetParticleSubType() == "kaon" || |
---|
2324 | targetParticle.GetDefinition()->GetParticleSubType() == "pi") { |
---|
2325 | pseudoParticle[0].SetMass( targetMass*GeV ); |
---|
2326 | pseudoParticle[0].SetTotalEnergy( etOriginal*GeV ); |
---|
2327 | pseudoParticle[0].SetMomentum( 0.0, 0.0, pOriginal*GeV ); |
---|
2328 | |
---|
2329 | pseudoParticle[1].SetMomentum( 0.0, 0.0, 0.0 ); |
---|
2330 | pseudoParticle[1].SetMass( mOriginal*GeV ); |
---|
2331 | pseudoParticle[1].SetKineticEnergy( 0.0 ); |
---|
2332 | |
---|
2333 | } else { |
---|
2334 | pseudoParticle[0].SetMass( currentMass*GeV ); |
---|
2335 | pseudoParticle[0].SetTotalEnergy( etCurrent*GeV ); |
---|
2336 | pseudoParticle[0].SetMomentum( 0.0, 0.0, pCurrent*GeV ); |
---|
2337 | |
---|
2338 | pseudoParticle[1].SetMomentum( 0.0, 0.0, 0.0 ); |
---|
2339 | pseudoParticle[1].SetMass( targetMass*GeV ); |
---|
2340 | pseudoParticle[1].SetKineticEnergy( 0.0 ); |
---|
2341 | } |
---|
2342 | // |
---|
2343 | // Transform into centre of mass system |
---|
2344 | // |
---|
2345 | pseudoParticle[2] = pseudoParticle[0] + pseudoParticle[1]; |
---|
2346 | pseudoParticle[0].Lorentz( pseudoParticle[0], pseudoParticle[2] ); |
---|
2347 | pseudoParticle[1].Lorentz( pseudoParticle[1], pseudoParticle[2] ); |
---|
2348 | // |
---|
2349 | // Set final state masses and energies in centre of mass system |
---|
2350 | // |
---|
2351 | currentParticle.SetTotalEnergy( std::sqrt(pf*pf+currentMass*currentMass)*GeV ); |
---|
2352 | targetParticle.SetTotalEnergy( std::sqrt(pf*pf+targetMass*targetMass)*GeV ); |
---|
2353 | // |
---|
2354 | // Set |t| and |tmin| |
---|
2355 | // |
---|
2356 | const G4double cb = 0.01; |
---|
2357 | const G4double b1 = 4.225; |
---|
2358 | const G4double b2 = 1.795; |
---|
2359 | // |
---|
2360 | // Calculate slope b for elastic scattering on proton/neutron |
---|
2361 | // |
---|
2362 | G4double b = std::max( cb, b1+b2*std::log(pOriginal) ); |
---|
2363 | G4double btrang = b * 4.0 * pf * pseudoParticle[0].GetMomentum().mag()/GeV; |
---|
2364 | |
---|
2365 | G4double exindt = -1.0; |
---|
2366 | exindt += std::exp(std::max(-btrang,expxl)); |
---|
2367 | // |
---|
2368 | // Calculate sqr(std::sin(teta/2.) and std::cos(teta), set azimuth angle phi |
---|
2369 | // |
---|
2370 | G4double ctet = 1.0 + 2*std::log( 1.0+G4UniformRand()*exindt ) / btrang; |
---|
2371 | if( std::fabs(ctet) > 1.0 )ctet > 0.0 ? ctet = 1.0 : ctet = -1.0; |
---|
2372 | G4double stet = std::sqrt( (1.0-ctet)*(1.0+ctet) ); |
---|
2373 | G4double phi = twopi * G4UniformRand(); |
---|
2374 | // |
---|
2375 | // Calculate final state momenta in centre of mass system |
---|
2376 | // |
---|
2377 | if (targetParticle.GetDefinition()->GetParticleSubType() == "kaon" || |
---|
2378 | targetParticle.GetDefinition()->GetParticleSubType() == "pi") { |
---|
2379 | |
---|
2380 | currentParticle.SetMomentum( -pf*stet*std::sin(phi)*GeV, |
---|
2381 | -pf*stet*std::cos(phi)*GeV, |
---|
2382 | -pf*ctet*GeV ); |
---|
2383 | } else { |
---|
2384 | |
---|
2385 | currentParticle.SetMomentum( pf*stet*std::sin(phi)*GeV, |
---|
2386 | pf*stet*std::cos(phi)*GeV, |
---|
2387 | pf*ctet*GeV ); |
---|
2388 | } |
---|
2389 | targetParticle.SetMomentum( currentParticle.GetMomentum() * (-1.0) ); |
---|
2390 | // |
---|
2391 | // Transform into lab system |
---|
2392 | // |
---|
2393 | currentParticle.Lorentz( currentParticle, pseudoParticle[1] ); |
---|
2394 | targetParticle.Lorentz( targetParticle, pseudoParticle[1] ); |
---|
2395 | |
---|
2396 | Defs1( modifiedOriginal, currentParticle, targetParticle, vec, vecLen ); |
---|
2397 | |
---|
2398 | G4double pp, pp1, ekin; |
---|
2399 | if( atomicWeight >= 1.5 ) |
---|
2400 | { |
---|
2401 | const G4double cfa = 0.025*((atomicWeight-1.)/120.)*std::exp(-(atomicWeight-1.)/120.); |
---|
2402 | pp1 = currentParticle.GetMomentum().mag()/MeV; |
---|
2403 | if( pp1 >= 1.0 ) |
---|
2404 | { |
---|
2405 | ekin = currentParticle.GetKineticEnergy()/MeV - cfa*(1.0+0.5*normal())*GeV; |
---|
2406 | ekin = std::max( 0.0001*GeV, ekin ); |
---|
2407 | currentParticle.SetKineticEnergy( ekin*MeV ); |
---|
2408 | pp = currentParticle.GetTotalMomentum()/MeV; |
---|
2409 | currentParticle.SetMomentum( currentParticle.GetMomentum() * (pp/pp1) ); |
---|
2410 | } |
---|
2411 | pp1 = targetParticle.GetMomentum().mag()/MeV; |
---|
2412 | if( pp1 >= 1.0 ) |
---|
2413 | { |
---|
2414 | ekin = targetParticle.GetKineticEnergy()/MeV - cfa*(1.0+normal()/2.)*GeV; |
---|
2415 | ekin = std::max( 0.0001*GeV, ekin ); |
---|
2416 | targetParticle.SetKineticEnergy( ekin*MeV ); |
---|
2417 | pp = targetParticle.GetTotalMomentum()/MeV; |
---|
2418 | targetParticle.SetMomentum( targetParticle.GetMomentum() * (pp/pp1) ); |
---|
2419 | } |
---|
2420 | } |
---|
2421 | } |
---|
2422 | |
---|
2423 | // Get number of final state nucleons and nucleons remaining in |
---|
2424 | // target nucleus |
---|
2425 | |
---|
2426 | std::pair<G4int, G4int> finalStateNucleons = |
---|
2427 | GetFinalStateNucleons(originalTarget, vec, vecLen); |
---|
2428 | G4int protonsInFinalState = finalStateNucleons.first; |
---|
2429 | G4int neutronsInFinalState = finalStateNucleons.second; |
---|
2430 | |
---|
2431 | G4int PinNucleus = std::max(0, |
---|
2432 | targetNucleus.GetZ_asInt() - protonsInFinalState); |
---|
2433 | G4int NinNucleus = std::max(0, |
---|
2434 | targetNucleus.GetN_asInt() - neutronsInFinalState); |
---|
2435 | |
---|
2436 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
2437 | if( atomicWeight >= 1.5 ) |
---|
2438 | { |
---|
2439 | // Add black track particles |
---|
2440 | // npnb is number of proton/neutron black track particles |
---|
2441 | // ndta is the number of deuterons, tritons, and alphas produced |
---|
2442 | // epnb is the kinetic energy available for proton/neutron black track particles |
---|
2443 | // edta is the kinetic energy available for deuteron/triton/alpha particles |
---|
2444 | // |
---|
2445 | G4double epnb, edta; |
---|
2446 | G4int npnb=0, ndta=0; |
---|
2447 | |
---|
2448 | epnb = targetNucleus.GetPNBlackTrackEnergy(); // was enp1 in fortran code |
---|
2449 | edta = targetNucleus.GetDTABlackTrackEnergy(); // was enp3 in fortran code |
---|
2450 | const G4double pnCutOff = 0.0001; // GeV |
---|
2451 | const G4double dtaCutOff = 0.0001; // GeV |
---|
2452 | const G4double kineticMinimum = 0.0001; |
---|
2453 | const G4double kineticFactor = -0.010; |
---|
2454 | G4double sprob = 0.0; // sprob = probability of self-absorption in heavy molecules |
---|
2455 | if( epnb >= pnCutOff ) |
---|
2456 | { |
---|
2457 | npnb = Poisson( epnb/0.02 ); |
---|
2458 | if( npnb > atomicWeight )npnb = G4int(atomicWeight); |
---|
2459 | if( (epnb > pnCutOff) && (npnb <= 0) )npnb = 1; |
---|
2460 | npnb = std::min( npnb, 127-vecLen ); |
---|
2461 | } |
---|
2462 | if( edta >= dtaCutOff ) |
---|
2463 | { |
---|
2464 | ndta = G4int(2.0 * std::log(atomicWeight)); |
---|
2465 | ndta = std::min( ndta, 127-vecLen ); |
---|
2466 | } |
---|
2467 | |
---|
2468 | if (npnb == 0 && ndta == 0) npnb = 1; |
---|
2469 | |
---|
2470 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
2471 | |
---|
2472 | AddBlackTrackParticles(epnb, npnb, edta, ndta, sprob, kineticMinimum, |
---|
2473 | kineticFactor, modifiedOriginal, |
---|
2474 | PinNucleus, NinNucleus, targetNucleus, |
---|
2475 | vec, vecLen); |
---|
2476 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
2477 | } |
---|
2478 | // |
---|
2479 | // calculate time delay for nuclear reactions |
---|
2480 | // |
---|
2481 | if( (atomicWeight >= 1.5) && (atomicWeight <= 230.0) && (ekOriginal <= 0.2) ) |
---|
2482 | currentParticle.SetTOF( 1.0-500.0*std::exp(-ekOriginal/0.04)*std::log(G4UniformRand()) ); |
---|
2483 | else |
---|
2484 | currentParticle.SetTOF( 1.0 ); |
---|
2485 | return; |
---|
2486 | } |
---|
2487 | |
---|
2488 | G4double G4ReactionDynamics::GenerateNBodyEvent( |
---|
2489 | const G4double totalEnergy, // MeV |
---|
2490 | const G4bool constantCrossSection, |
---|
2491 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> &vec, |
---|
2492 | G4int &vecLen ) |
---|
2493 | { |
---|
2494 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
2495 | // derived from original FORTRAN code PHASP by H. Fesefeldt (02-Dec-1986) |
---|
2496 | // Returns the weight of the event |
---|
2497 | // |
---|
2498 | G4int i; |
---|
2499 | const G4double expxu = 82.; // upper bound for arg. of exp |
---|
2500 | const G4double expxl = -expxu; // lower bound for arg. of exp |
---|
2501 | if( vecLen < 2 ) |
---|
2502 | { |
---|
2503 | G4cerr << "*** Error in G4ReactionDynamics::GenerateNBodyEvent" << G4endl; |
---|
2504 | G4cerr << " number of particles < 2" << G4endl; |
---|
2505 | G4cerr << "totalEnergy = " << totalEnergy << "MeV, vecLen = " << vecLen << G4endl; |
---|
2506 | return -1.0; |
---|
2507 | } |
---|
2508 | G4double mass[18]; // mass of each particle |
---|
2509 | G4double energy[18]; // total energy of each particle |
---|
2510 | G4double pcm[3][18]; // pcm is an array with 3 rows and vecLen columns |
---|
2511 | |
---|
2512 | G4double totalMass = 0.0; |
---|
2513 | G4double extraMass = 0; |
---|
2514 | G4double sm[18]; |
---|
2515 | |
---|
2516 | for( i=0; i<vecLen; ++i ) |
---|
2517 | { |
---|
2518 | mass[i] = vec[i]->GetMass()/GeV; |
---|
2519 | if(vec[i]->GetSide() == -2) extraMass+=vec[i]->GetMass()/GeV; |
---|
2520 | vec[i]->SetMomentum( 0.0, 0.0, 0.0 ); |
---|
2521 | pcm[0][i] = 0.0; // x-momentum of i-th particle |
---|
2522 | pcm[1][i] = 0.0; // y-momentum of i-th particle |
---|
2523 | pcm[2][i] = 0.0; // z-momentum of i-th particle |
---|
2524 | energy[i] = mass[i]; // total energy of i-th particle |
---|
2525 | totalMass += mass[i]; |
---|
2526 | sm[i] = totalMass; |
---|
2527 | } |
---|
2528 | G4double totalE = totalEnergy/GeV; |
---|
2529 | if( totalMass > totalE ) |
---|
2530 | { |
---|
2531 | //G4cerr << "*** Error in G4ReactionDynamics::GenerateNBodyEvent" << G4endl; |
---|
2532 | //G4cerr << " total mass (" << totalMass*GeV << "MeV) > total energy (" |
---|
2533 | // << totalEnergy << "MeV)" << G4endl; |
---|
2534 | totalE = totalMass; |
---|
2535 | return -1.0; |
---|
2536 | } |
---|
2537 | G4double kineticEnergy = totalE - totalMass; |
---|
2538 | G4double emm[18]; |
---|
2539 | //G4double *emm = new G4double [vecLen]; |
---|
2540 | emm[0] = mass[0]; |
---|
2541 | emm[vecLen-1] = totalE; |
---|
2542 | if( vecLen > 2 ) // the random numbers are sorted |
---|
2543 | { |
---|
2544 | G4double ran[18]; |
---|
2545 | for( i=0; i<vecLen; ++i )ran[i] = G4UniformRand(); |
---|
2546 | for( i=0; i<vecLen-2; ++i ) |
---|
2547 | { |
---|
2548 | for( G4int j=vecLen-2; j>i; --j ) |
---|
2549 | { |
---|
2550 | if( ran[i] > ran[j] ) |
---|
2551 | { |
---|
2552 | G4double temp = ran[i]; |
---|
2553 | ran[i] = ran[j]; |
---|
2554 | ran[j] = temp; |
---|
2555 | } |
---|
2556 | } |
---|
2557 | } |
---|
2558 | for( i=1; i<vecLen-1; ++i )emm[i] = ran[i-1]*kineticEnergy + sm[i]; |
---|
2559 | } |
---|
2560 | // Weight is the sum of logarithms of terms instead of the product of terms |
---|
2561 | G4bool lzero = true; |
---|
2562 | G4double wtmax = 0.0; |
---|
2563 | if( constantCrossSection ) // this is KGENEV=1 in PHASP |
---|
2564 | { |
---|
2565 | G4double emmax = kineticEnergy + mass[0]; |
---|
2566 | G4double emmin = 0.0; |
---|
2567 | for( i=1; i<vecLen; ++i ) |
---|
2568 | { |
---|
2569 | emmin += mass[i-1]; |
---|
2570 | emmax += mass[i]; |
---|
2571 | G4double wtfc = 0.0; |
---|
2572 | if( emmax*emmax > 0.0 ) |
---|
2573 | { |
---|
2574 | G4double arg = emmax*emmax |
---|
2575 | + (emmin*emmin-mass[i]*mass[i])*(emmin*emmin-mass[i]*mass[i])/(emmax*emmax) |
---|
2576 | - 2.0*(emmin*emmin+mass[i]*mass[i]); |
---|
2577 | if( arg > 0.0 )wtfc = 0.5*std::sqrt( arg ); |
---|
2578 | } |
---|
2579 | if( wtfc == 0.0 ) |
---|
2580 | { |
---|
2581 | lzero = false; |
---|
2582 | break; |
---|
2583 | } |
---|
2584 | wtmax += std::log( wtfc ); |
---|
2585 | } |
---|
2586 | if( lzero ) |
---|
2587 | wtmax = -wtmax; |
---|
2588 | else |
---|
2589 | wtmax = expxu; |
---|
2590 | } |
---|
2591 | else |
---|
2592 | { |
---|
2593 | // ffq(n) = pi*(2*pi)^(n-2)/(n-2)! |
---|
2594 | const G4double ffq[18] = { 0., 3.141592, 19.73921, 62.01255, 129.8788, 204.0131, |
---|
2595 | 256.3704, 268.4705, 240.9780, 189.2637, |
---|
2596 | 132.1308, 83.0202, 47.4210, 24.8295, |
---|
2597 | 12.0006, 5.3858, 2.2560, 0.8859 }; |
---|
2598 | wtmax = std::log( std::pow( kineticEnergy, vecLen-2 ) * ffq[vecLen-1] / totalE ); |
---|
2599 | } |
---|
2600 | lzero = true; |
---|
2601 | G4double pd[50]; |
---|
2602 | //G4double *pd = new G4double [vecLen-1]; |
---|
2603 | for( i=0; i<vecLen-1; ++i ) |
---|
2604 | { |
---|
2605 | pd[i] = 0.0; |
---|
2606 | if( emm[i+1]*emm[i+1] > 0.0 ) |
---|
2607 | { |
---|
2608 | G4double arg = emm[i+1]*emm[i+1] |
---|
2609 | + (emm[i]*emm[i]-mass[i+1]*mass[i+1])*(emm[i]*emm[i]-mass[i+1]*mass[i+1]) |
---|
2610 | /(emm[i+1]*emm[i+1]) |
---|
2611 | - 2.0*(emm[i]*emm[i]+mass[i+1]*mass[i+1]); |
---|
2612 | if( arg > 0.0 )pd[i] = 0.5*std::sqrt( arg ); |
---|
2613 | } |
---|
2614 | if( pd[i] <= 0.0 ) // changed from == on 02 April 98 |
---|
2615 | lzero = false; |
---|
2616 | else |
---|
2617 | wtmax += std::log( pd[i] ); |
---|
2618 | } |
---|
2619 | G4double weight = 0.0; // weight is returned by GenerateNBodyEvent |
---|
2620 | if( lzero )weight = std::exp( std::max(std::min(wtmax,expxu),expxl) ); |
---|
2621 | |
---|
2622 | G4double bang, cb, sb, s0, s1, s2, c, s, esys, a, b, gama, beta; |
---|
2623 | pcm[0][0] = 0.0; |
---|
2624 | pcm[1][0] = pd[0]; |
---|
2625 | pcm[2][0] = 0.0; |
---|
2626 | for( i=1; i<vecLen; ++i ) |
---|
2627 | { |
---|
2628 | pcm[0][i] = 0.0; |
---|
2629 | pcm[1][i] = -pd[i-1]; |
---|
2630 | pcm[2][i] = 0.0; |
---|
2631 | bang = twopi*G4UniformRand(); |
---|
2632 | cb = std::cos(bang); |
---|
2633 | sb = std::sin(bang); |
---|
2634 | c = 2.0*G4UniformRand() - 1.0; |
---|
2635 | s = std::sqrt( std::fabs( 1.0-c*c ) ); |
---|
2636 | if( i < vecLen-1 ) |
---|
2637 | { |
---|
2638 | esys = std::sqrt(pd[i]*pd[i] + emm[i]*emm[i]); |
---|
2639 | beta = pd[i]/esys; |
---|
2640 | gama = esys/emm[i]; |
---|
2641 | for( G4int j=0; j<=i; ++j ) |
---|
2642 | { |
---|
2643 | s0 = pcm[0][j]; |
---|
2644 | s1 = pcm[1][j]; |
---|
2645 | s2 = pcm[2][j]; |
---|
2646 | energy[j] = std::sqrt( s0*s0 + s1*s1 + s2*s2 + mass[j]*mass[j] ); |
---|
2647 | a = s0*c - s1*s; // rotation |
---|
2648 | pcm[1][j] = s0*s + s1*c; |
---|
2649 | b = pcm[2][j]; |
---|
2650 | pcm[0][j] = a*cb - b*sb; |
---|
2651 | pcm[2][j] = a*sb + b*cb; |
---|
2652 | pcm[1][j] = gama*(pcm[1][j] + beta*energy[j]); |
---|
2653 | } |
---|
2654 | } |
---|
2655 | else |
---|
2656 | { |
---|
2657 | for( G4int j=0; j<=i; ++j ) |
---|
2658 | { |
---|
2659 | s0 = pcm[0][j]; |
---|
2660 | s1 = pcm[1][j]; |
---|
2661 | s2 = pcm[2][j]; |
---|
2662 | energy[j] = std::sqrt( s0*s0 + s1*s1 + s2*s2 + mass[j]*mass[j] ); |
---|
2663 | a = s0*c - s1*s; // rotation |
---|
2664 | pcm[1][j] = s0*s + s1*c; |
---|
2665 | b = pcm[2][j]; |
---|
2666 | pcm[0][j] = a*cb - b*sb; |
---|
2667 | pcm[2][j] = a*sb + b*cb; |
---|
2668 | } |
---|
2669 | } |
---|
2670 | } |
---|
2671 | for( i=0; i<vecLen; ++i ) |
---|
2672 | { |
---|
2673 | vec[i]->SetMomentum( pcm[0][i]*GeV, pcm[1][i]*GeV, pcm[2][i]*GeV ); |
---|
2674 | vec[i]->SetTotalEnergy( energy[i]*GeV ); |
---|
2675 | } |
---|
2676 | |
---|
2677 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
2678 | return weight; |
---|
2679 | } |
---|
2680 | |
---|
2681 | G4double |
---|
2682 | G4ReactionDynamics::normal() |
---|
2683 | { |
---|
2684 | G4double ran = -6.0; |
---|
2685 | for( G4int i=0; i<12; ++i )ran += G4UniformRand(); |
---|
2686 | return ran; |
---|
2687 | } |
---|
2688 | |
---|
2689 | G4int |
---|
2690 | G4ReactionDynamics::Poisson( G4double x ) // generation of poisson distribution |
---|
2691 | { |
---|
2692 | G4int iran; |
---|
2693 | G4double ran; |
---|
2694 | |
---|
2695 | if( x > 9.9 ) // use normal distribution with sigma^2 = <x> |
---|
2696 | iran = static_cast<G4int>(std::max( 0.0, x+normal()*std::sqrt(x) ) ); |
---|
2697 | else { |
---|
2698 | G4int mm = G4int(5.0*x); |
---|
2699 | if( mm <= 0 ) // for very small x try iran=1,2,3 |
---|
2700 | { |
---|
2701 | G4double p1 = x*std::exp(-x); |
---|
2702 | G4double p2 = x*p1/2.0; |
---|
2703 | G4double p3 = x*p2/3.0; |
---|
2704 | ran = G4UniformRand(); |
---|
2705 | if( ran < p3 ) |
---|
2706 | iran = 3; |
---|
2707 | else if( ran < p2 ) // this is original Geisha, it should be ran < p2+p3 |
---|
2708 | iran = 2; |
---|
2709 | else if( ran < p1 ) // should be ran < p1+p2+p3 |
---|
2710 | iran = 1; |
---|
2711 | else |
---|
2712 | iran = 0; |
---|
2713 | } |
---|
2714 | else |
---|
2715 | { |
---|
2716 | iran = 0; |
---|
2717 | G4double r = std::exp(-x); |
---|
2718 | ran = G4UniformRand(); |
---|
2719 | if( ran > r ) |
---|
2720 | { |
---|
2721 | G4double rrr; |
---|
2722 | G4double rr = r; |
---|
2723 | for( G4int i=1; i<=mm; ++i ) |
---|
2724 | { |
---|
2725 | iran++; |
---|
2726 | if( i > 5 ) // Stirling's formula for large numbers |
---|
2727 | rrr = std::exp(i*std::log(x)-(i+0.5)*std::log((G4double)i)+i-0.9189385); |
---|
2728 | else |
---|
2729 | rrr = std::pow(x,i)/Factorial(i); |
---|
2730 | rr += r*rrr; |
---|
2731 | if( ran <= rr )break; |
---|
2732 | } |
---|
2733 | } |
---|
2734 | } |
---|
2735 | } |
---|
2736 | return iran; |
---|
2737 | } |
---|
2738 | |
---|
2739 | G4int |
---|
2740 | G4ReactionDynamics::Factorial( G4int n ) |
---|
2741 | { // calculates factorial( n ) = n*(n-1)*(n-2)*...*1 |
---|
2742 | G4int m = std::min(n,10); |
---|
2743 | G4int result = 1; |
---|
2744 | if( m <= 1 )return result; |
---|
2745 | for( G4int i=2; i<=m; ++i )result *= i; |
---|
2746 | return result; |
---|
2747 | } |
---|
2748 | |
---|
2749 | void G4ReactionDynamics::Defs1( |
---|
2750 | const G4ReactionProduct &modifiedOriginal, |
---|
2751 | G4ReactionProduct ¤tParticle, |
---|
2752 | G4ReactionProduct &targetParticle, |
---|
2753 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> &vec, |
---|
2754 | G4int &vecLen ) |
---|
2755 | { |
---|
2756 | const G4double pjx = modifiedOriginal.GetMomentum().x()/MeV; |
---|
2757 | const G4double pjy = modifiedOriginal.GetMomentum().y()/MeV; |
---|
2758 | const G4double pjz = modifiedOriginal.GetMomentum().z()/MeV; |
---|
2759 | const G4double p = modifiedOriginal.GetMomentum().mag()/MeV; |
---|
2760 | if( pjx*pjx+pjy*pjy > 0.0 ) |
---|
2761 | { |
---|
2762 | G4double cost, sint, ph, cosp, sinp, pix, piy, piz; |
---|
2763 | cost = pjz/p; |
---|
2764 | sint = 0.5 * ( std::sqrt(std::abs((1.0-cost)*(1.0+cost))) + std::sqrt(pjx*pjx+pjy*pjy)/p ); |
---|
2765 | if( pjy < 0.0 ) |
---|
2766 | ph = 3*halfpi; |
---|
2767 | else |
---|
2768 | ph = halfpi; |
---|
2769 | if( std::abs( pjx ) > 0.001*MeV )ph = std::atan2(pjy,pjx); |
---|
2770 | cosp = std::cos(ph); |
---|
2771 | sinp = std::sin(ph); |
---|
2772 | pix = currentParticle.GetMomentum().x()/MeV; |
---|
2773 | piy = currentParticle.GetMomentum().y()/MeV; |
---|
2774 | piz = currentParticle.GetMomentum().z()/MeV; |
---|
2775 | currentParticle.SetMomentum( cost*cosp*pix*MeV - sinp*piy+sint*cosp*piz*MeV, |
---|
2776 | cost*sinp*pix*MeV + cosp*piy+sint*sinp*piz*MeV, |
---|
2777 | -sint*pix*MeV + cost*piz*MeV ); |
---|
2778 | pix = targetParticle.GetMomentum().x()/MeV; |
---|
2779 | piy = targetParticle.GetMomentum().y()/MeV; |
---|
2780 | piz = targetParticle.GetMomentum().z()/MeV; |
---|
2781 | targetParticle.SetMomentum( cost*cosp*pix*MeV - sinp*piy+sint*cosp*piz*MeV, |
---|
2782 | cost*sinp*pix*MeV + cosp*piy+sint*sinp*piz*MeV, |
---|
2783 | -sint*pix*MeV + cost*piz*MeV ); |
---|
2784 | for( G4int i=0; i<vecLen; ++i ) |
---|
2785 | { |
---|
2786 | pix = vec[i]->GetMomentum().x()/MeV; |
---|
2787 | piy = vec[i]->GetMomentum().y()/MeV; |
---|
2788 | piz = vec[i]->GetMomentum().z()/MeV; |
---|
2789 | vec[i]->SetMomentum( cost*cosp*pix*MeV - sinp*piy+sint*cosp*piz*MeV, |
---|
2790 | cost*sinp*pix*MeV + cosp*piy+sint*sinp*piz*MeV, |
---|
2791 | -sint*pix*MeV + cost*piz*MeV ); |
---|
2792 | } |
---|
2793 | } |
---|
2794 | else |
---|
2795 | { |
---|
2796 | if( pjz < 0.0 ) |
---|
2797 | { |
---|
2798 | currentParticle.SetMomentum( -currentParticle.GetMomentum().z() ); |
---|
2799 | targetParticle.SetMomentum( -targetParticle.GetMomentum().z() ); |
---|
2800 | for( G4int i=0; i<vecLen; ++i ) |
---|
2801 | vec[i]->SetMomentum( -vec[i]->GetMomentum().z() ); |
---|
2802 | } |
---|
2803 | } |
---|
2804 | } |
---|
2805 | |
---|
2806 | void G4ReactionDynamics::Rotate( |
---|
2807 | const G4double numberofFinalStateNucleons, |
---|
2808 | const G4ThreeVector &temp, |
---|
2809 | const G4ReactionProduct &modifiedOriginal, // Fermi motion & evap. effect included |
---|
2810 | const G4HadProjectile *originalIncident, // original incident particle |
---|
2811 | const G4Nucleus &targetNucleus, |
---|
2812 | G4ReactionProduct ¤tParticle, |
---|
2813 | G4ReactionProduct &targetParticle, |
---|
2814 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> &vec, |
---|
2815 | G4int &vecLen ) |
---|
2816 | { |
---|
2817 | // derived from original FORTRAN code in GENXPT and TWOCLU by H. Fesefeldt |
---|
2818 | // |
---|
2819 | // Rotate in direction of z-axis, this does disturb in some way our |
---|
2820 | // inclusive distributions, but it is necessary for momentum conservation |
---|
2821 | // |
---|
2822 | const G4double atomicWeight = G4double(targetNucleus.GetA_asInt()); |
---|
2823 | const G4double logWeight = std::log(atomicWeight); |
---|
2824 | |
---|
2825 | G4ParticleDefinition *aPiMinus = G4PionMinus::PionMinus(); |
---|
2826 | G4ParticleDefinition *aPiPlus = G4PionPlus::PionPlus(); |
---|
2827 | G4ParticleDefinition *aPiZero = G4PionZero::PionZero(); |
---|
2828 | |
---|
2829 | G4int i; |
---|
2830 | G4ThreeVector pseudoParticle[4]; |
---|
2831 | for( i=0; i<4; ++i )pseudoParticle[i].set(0,0,0); |
---|
2832 | pseudoParticle[0] = currentParticle.GetMomentum() |
---|
2833 | + targetParticle.GetMomentum(); |
---|
2834 | for( i=0; i<vecLen; ++i ) |
---|
2835 | pseudoParticle[0] = pseudoParticle[0] + (vec[i]->GetMomentum()); |
---|
2836 | // |
---|
2837 | // Some smearing in transverse direction from Fermi motion |
---|
2838 | // |
---|
2839 | G4float pp, pp1; |
---|
2840 | G4double alekw, p; |
---|
2841 | G4double r1, r2, a1, ran1, ran2, xxh, exh, pxTemp, pyTemp, pzTemp; |
---|
2842 | |
---|
2843 | r1 = twopi*G4UniformRand(); |
---|
2844 | r2 = G4UniformRand(); |
---|
2845 | a1 = std::sqrt(-2.0*std::log(r2)); |
---|
2846 | ran1 = a1*std::sin(r1)*0.020*numberofFinalStateNucleons*GeV; |
---|
2847 | ran2 = a1*std::cos(r1)*0.020*numberofFinalStateNucleons*GeV; |
---|
2848 | G4ThreeVector fermi(ran1, ran2, 0); |
---|
2849 | |
---|
2850 | pseudoParticle[0] = pseudoParticle[0]+fermi; // all particles + fermi |
---|
2851 | pseudoParticle[2] = temp; // original in cms system |
---|
2852 | pseudoParticle[3] = pseudoParticle[0]; |
---|
2853 | |
---|
2854 | pseudoParticle[1] = pseudoParticle[2].cross(pseudoParticle[3]); |
---|
2855 | G4double rotation = 2.*pi*G4UniformRand(); |
---|
2856 | pseudoParticle[1] = pseudoParticle[1].rotate(rotation, pseudoParticle[3]); |
---|
2857 | pseudoParticle[2] = pseudoParticle[3].cross(pseudoParticle[1]); |
---|
2858 | for(G4int ii=1; ii<=3; ii++) |
---|
2859 | { |
---|
2860 | p = pseudoParticle[ii].mag(); |
---|
2861 | if( p == 0.0 ) |
---|
2862 | pseudoParticle[ii]= G4ThreeVector( 0.0, 0.0, 0.0 ); |
---|
2863 | else |
---|
2864 | pseudoParticle[ii]= pseudoParticle[ii] * (1./p); |
---|
2865 | } |
---|
2866 | |
---|
2867 | pxTemp = pseudoParticle[1].dot(currentParticle.GetMomentum()); |
---|
2868 | pyTemp = pseudoParticle[2].dot(currentParticle.GetMomentum()); |
---|
2869 | pzTemp = pseudoParticle[3].dot(currentParticle.GetMomentum()); |
---|
2870 | currentParticle.SetMomentum( pxTemp, pyTemp, pzTemp ); |
---|
2871 | |
---|
2872 | pxTemp = pseudoParticle[1].dot(targetParticle.GetMomentum()); |
---|
2873 | pyTemp = pseudoParticle[2].dot(targetParticle.GetMomentum()); |
---|
2874 | pzTemp = pseudoParticle[3].dot(targetParticle.GetMomentum()); |
---|
2875 | targetParticle.SetMomentum( pxTemp, pyTemp, pzTemp ); |
---|
2876 | |
---|
2877 | for( i=0; i<vecLen; ++i ) |
---|
2878 | { |
---|
2879 | pxTemp = pseudoParticle[1].dot(vec[i]->GetMomentum()); |
---|
2880 | pyTemp = pseudoParticle[2].dot(vec[i]->GetMomentum()); |
---|
2881 | pzTemp = pseudoParticle[3].dot(vec[i]->GetMomentum()); |
---|
2882 | vec[i]->SetMomentum( pxTemp, pyTemp, pzTemp ); |
---|
2883 | } |
---|
2884 | // |
---|
2885 | // Rotate in direction of primary particle, subtract binding energies |
---|
2886 | // and make some further corrections if required |
---|
2887 | // |
---|
2888 | Defs1( modifiedOriginal, currentParticle, targetParticle, vec, vecLen ); |
---|
2889 | G4double ekin; |
---|
2890 | G4double dekin = 0.0; |
---|
2891 | G4double ek1 = 0.0; |
---|
2892 | G4int npions = 0; |
---|
2893 | if( atomicWeight >= 1.5 ) // self-absorption in heavy molecules |
---|
2894 | { |
---|
2895 | // corrections for single particle spectra (shower particles) |
---|
2896 | // |
---|
2897 | const G4double alem[] = { 1.40, 2.30, 2.70, 3.00, 3.40, 4.60, 7.00 }; |
---|
2898 | const G4double val0[] = { 0.00, 0.40, 0.48, 0.51, 0.54, 0.60, 0.65 }; |
---|
2899 | alekw = std::log( originalIncident->GetKineticEnergy()/GeV ); |
---|
2900 | exh = 1.0; |
---|
2901 | if( alekw > alem[0] ) // get energy bin |
---|
2902 | { |
---|
2903 | exh = val0[6]; |
---|
2904 | for( G4int j=1; j<7; ++j ) |
---|
2905 | { |
---|
2906 | if( alekw < alem[j] ) // use linear interpolation/extrapolation |
---|
2907 | { |
---|
2908 | G4double rcnve = (val0[j] - val0[j-1]) / (alem[j] - alem[j-1]); |
---|
2909 | exh = rcnve * alekw + val0[j-1] - rcnve * alem[j-1]; |
---|
2910 | break; |
---|
2911 | } |
---|
2912 | } |
---|
2913 | exh = 1.0 - exh; |
---|
2914 | } |
---|
2915 | const G4double cfa = 0.025*((atomicWeight-1.)/120.)*std::exp(-(atomicWeight-1.)/120.); |
---|
2916 | ekin = currentParticle.GetKineticEnergy()/GeV - cfa*(1+normal()/2.0); |
---|
2917 | ekin = std::max( 1.0e-6, ekin ); |
---|
2918 | xxh = 1.0; |
---|
2919 | if( (modifiedOriginal.GetDefinition() == aPiPlus || |
---|
2920 | modifiedOriginal.GetDefinition() == aPiMinus) && |
---|
2921 | currentParticle.GetDefinition() == aPiZero && |
---|
2922 | G4UniformRand() <= logWeight) xxh = exh; |
---|
2923 | dekin += ekin*(1.0-xxh); |
---|
2924 | ekin *= xxh; |
---|
2925 | if (currentParticle.GetDefinition()->GetParticleSubType() == "pi") { |
---|
2926 | ++npions; |
---|
2927 | ek1 += ekin; |
---|
2928 | } |
---|
2929 | currentParticle.SetKineticEnergy( ekin*GeV ); |
---|
2930 | pp = currentParticle.GetTotalMomentum()/MeV; |
---|
2931 | pp1 = currentParticle.GetMomentum().mag()/MeV; |
---|
2932 | if( pp1 < 0.001*MeV ) |
---|
2933 | { |
---|
2934 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
2935 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
2936 | G4double phi = twopi*G4UniformRand(); |
---|
2937 | currentParticle.SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
2938 | pp*sintheta*std::sin(phi)*MeV, |
---|
2939 | pp*costheta*MeV ) ; |
---|
2940 | } |
---|
2941 | else |
---|
2942 | currentParticle.SetMomentum( currentParticle.GetMomentum() * (pp/pp1) ); |
---|
2943 | ekin = targetParticle.GetKineticEnergy()/GeV - cfa*(1+normal()/2.0); |
---|
2944 | ekin = std::max( 1.0e-6, ekin ); |
---|
2945 | xxh = 1.0; |
---|
2946 | if( (modifiedOriginal.GetDefinition() == aPiPlus || |
---|
2947 | modifiedOriginal.GetDefinition() == aPiMinus) && |
---|
2948 | targetParticle.GetDefinition() == aPiZero && |
---|
2949 | G4UniformRand() < logWeight) xxh = exh; |
---|
2950 | dekin += ekin*(1.0-xxh); |
---|
2951 | ekin *= xxh; |
---|
2952 | if (targetParticle.GetDefinition()->GetParticleSubType() == "pi") { |
---|
2953 | ++npions; |
---|
2954 | ek1 += ekin; |
---|
2955 | } |
---|
2956 | targetParticle.SetKineticEnergy( ekin*GeV ); |
---|
2957 | pp = targetParticle.GetTotalMomentum()/MeV; |
---|
2958 | pp1 = targetParticle.GetMomentum().mag()/MeV; |
---|
2959 | if( pp1 < 0.001*MeV ) |
---|
2960 | { |
---|
2961 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
2962 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
2963 | G4double phi = twopi*G4UniformRand(); |
---|
2964 | targetParticle.SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
2965 | pp*sintheta*std::sin(phi)*MeV, |
---|
2966 | pp*costheta*MeV ) ; |
---|
2967 | } |
---|
2968 | else |
---|
2969 | targetParticle.SetMomentum( targetParticle.GetMomentum() * (pp/pp1) ); |
---|
2970 | for( i=0; i<vecLen; ++i ) |
---|
2971 | { |
---|
2972 | ekin = vec[i]->GetKineticEnergy()/GeV - cfa*(1+normal()/2.0); |
---|
2973 | ekin = std::max( 1.0e-6, ekin ); |
---|
2974 | xxh = 1.0; |
---|
2975 | if( (modifiedOriginal.GetDefinition() == aPiPlus || |
---|
2976 | modifiedOriginal.GetDefinition() == aPiMinus) && |
---|
2977 | vec[i]->GetDefinition() == aPiZero && |
---|
2978 | G4UniformRand() < logWeight) xxh = exh; |
---|
2979 | dekin += ekin*(1.0-xxh); |
---|
2980 | ekin *= xxh; |
---|
2981 | if (vec[i]->GetDefinition()->GetParticleSubType() == "pi") { |
---|
2982 | ++npions; |
---|
2983 | ek1 += ekin; |
---|
2984 | } |
---|
2985 | vec[i]->SetKineticEnergy( ekin*GeV ); |
---|
2986 | pp = vec[i]->GetTotalMomentum()/MeV; |
---|
2987 | pp1 = vec[i]->GetMomentum().mag()/MeV; |
---|
2988 | if( pp1 < 0.001*MeV ) |
---|
2989 | { |
---|
2990 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
2991 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
2992 | G4double phi = twopi*G4UniformRand(); |
---|
2993 | vec[i]->SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
2994 | pp*sintheta*std::sin(phi)*MeV, |
---|
2995 | pp*costheta*MeV ) ; |
---|
2996 | } |
---|
2997 | else |
---|
2998 | vec[i]->SetMomentum( vec[i]->GetMomentum() * (pp/pp1) ); |
---|
2999 | } |
---|
3000 | } |
---|
3001 | if( (ek1 != 0.0) && (npions > 0) ) |
---|
3002 | { |
---|
3003 | dekin = 1.0 + dekin/ek1; |
---|
3004 | // |
---|
3005 | // first do the incident particle |
---|
3006 | // |
---|
3007 | if (currentParticle.GetDefinition()->GetParticleSubType() == "pi") |
---|
3008 | { |
---|
3009 | currentParticle.SetKineticEnergy( |
---|
3010 | std::max( 0.001*MeV, dekin*currentParticle.GetKineticEnergy() ) ); |
---|
3011 | pp = currentParticle.GetTotalMomentum()/MeV; |
---|
3012 | pp1 = currentParticle.GetMomentum().mag()/MeV; |
---|
3013 | if( pp1 < 0.001 ) |
---|
3014 | { |
---|
3015 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
3016 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
3017 | G4double phi = twopi*G4UniformRand(); |
---|
3018 | currentParticle.SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
3019 | pp*sintheta*std::sin(phi)*MeV, |
---|
3020 | pp*costheta*MeV ) ; |
---|
3021 | } else { |
---|
3022 | currentParticle.SetMomentum( currentParticle.GetMomentum() * (pp/pp1) ); |
---|
3023 | } |
---|
3024 | } |
---|
3025 | |
---|
3026 | if (targetParticle.GetDefinition()->GetParticleSubType() == "pi") |
---|
3027 | { |
---|
3028 | targetParticle.SetKineticEnergy( |
---|
3029 | std::max( 0.001*MeV, dekin*targetParticle.GetKineticEnergy() ) ); |
---|
3030 | pp = targetParticle.GetTotalMomentum()/MeV; |
---|
3031 | pp1 = targetParticle.GetMomentum().mag()/MeV; |
---|
3032 | if( pp1 < 0.001 ) |
---|
3033 | { |
---|
3034 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
3035 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
3036 | G4double phi = twopi*G4UniformRand(); |
---|
3037 | targetParticle.SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
3038 | pp*sintheta*std::sin(phi)*MeV, |
---|
3039 | pp*costheta*MeV ) ; |
---|
3040 | } else { |
---|
3041 | targetParticle.SetMomentum( targetParticle.GetMomentum() * (pp/pp1) ); |
---|
3042 | } |
---|
3043 | } |
---|
3044 | |
---|
3045 | for( i=0; i<vecLen; ++i ) |
---|
3046 | { |
---|
3047 | if (vec[i]->GetDefinition()->GetParticleSubType() == "pi") |
---|
3048 | { |
---|
3049 | vec[i]->SetKineticEnergy( std::max( 0.001*MeV, dekin*vec[i]->GetKineticEnergy() ) ); |
---|
3050 | pp = vec[i]->GetTotalMomentum()/MeV; |
---|
3051 | pp1 = vec[i]->GetMomentum().mag()/MeV; |
---|
3052 | if( pp1 < 0.001 ) |
---|
3053 | { |
---|
3054 | G4double costheta = 2.*G4UniformRand() - 1.; |
---|
3055 | G4double sintheta = std::sqrt(1. - costheta*costheta); |
---|
3056 | G4double phi = twopi*G4UniformRand(); |
---|
3057 | vec[i]->SetMomentum( pp*sintheta*std::cos(phi)*MeV, |
---|
3058 | pp*sintheta*std::sin(phi)*MeV, |
---|
3059 | pp*costheta*MeV ) ; |
---|
3060 | } else { |
---|
3061 | vec[i]->SetMomentum( vec[i]->GetMomentum() * (pp/pp1) ); |
---|
3062 | } |
---|
3063 | } |
---|
3064 | } // for i |
---|
3065 | } // if (ek1 != 0) |
---|
3066 | } |
---|
3067 | |
---|
3068 | void G4ReactionDynamics::AddBlackTrackParticles( |
---|
3069 | const G4double epnb, // GeV |
---|
3070 | const G4int npnb, |
---|
3071 | const G4double edta, // GeV |
---|
3072 | const G4int ndta, |
---|
3073 | const G4double sprob, |
---|
3074 | const G4double kineticMinimum, // GeV |
---|
3075 | const G4double kineticFactor, // GeV |
---|
3076 | const G4ReactionProduct &modifiedOriginal, |
---|
3077 | G4int PinNucleus, |
---|
3078 | G4int NinNucleus, |
---|
3079 | const G4Nucleus &targetNucleus, |
---|
3080 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> &vec, |
---|
3081 | G4int &vecLen ) |
---|
3082 | { |
---|
3083 | // derived from original FORTRAN code in GENXPT and TWOCLU by H. Fesefeldt |
---|
3084 | // |
---|
3085 | // npnb is number of proton/neutron black track particles |
---|
3086 | // ndta is the number of deuterons, tritons, and alphas produced |
---|
3087 | // epnb is the kinetic energy available for proton/neutron black track particles |
---|
3088 | // edta is the kinetic energy available for deuteron/triton/alpha particles |
---|
3089 | // |
---|
3090 | |
---|
3091 | G4ParticleDefinition *aProton = G4Proton::Proton(); |
---|
3092 | G4ParticleDefinition *aNeutron = G4Neutron::Neutron(); |
---|
3093 | G4ParticleDefinition *aDeuteron = G4Deuteron::Deuteron(); |
---|
3094 | G4ParticleDefinition *aTriton = G4Triton::Triton(); |
---|
3095 | G4ParticleDefinition *anAlpha = G4Alpha::Alpha(); |
---|
3096 | |
---|
3097 | const G4double ekOriginal = modifiedOriginal.GetKineticEnergy()/MeV; |
---|
3098 | const G4double atomicWeight = G4double(targetNucleus.GetA_asInt()); |
---|
3099 | const G4double atomicNumber = G4double(targetNucleus.GetZ_asInt()); |
---|
3100 | |
---|
3101 | const G4double ika1 = 3.6; |
---|
3102 | const G4double ika2 = 35.56; |
---|
3103 | const G4double ika3 = 6.45; |
---|
3104 | |
---|
3105 | G4int i; |
---|
3106 | G4double pp; |
---|
3107 | G4double kinCreated = 0; |
---|
3108 | G4double cfa = 0.025*((atomicWeight-1.0)/120.0) * std::exp(-(atomicWeight-1.0)/120.0); |
---|
3109 | |
---|
3110 | // First add protons and neutrons to final state |
---|
3111 | |
---|
3112 | if (npnb > 0) |
---|
3113 | { |
---|
3114 | G4double backwardKinetic = 0.0; |
---|
3115 | G4int local_npnb = npnb; |
---|
3116 | for( i=0; i<npnb; ++i ) if( G4UniformRand() < sprob ) local_npnb--; |
---|
3117 | G4double local_epnb = epnb; |
---|
3118 | if (ndta == 0) local_epnb += edta; // Retrieve unused kinetic energy |
---|
3119 | G4double ekin = local_epnb/std::max(1,local_npnb); |
---|
3120 | |
---|
3121 | for( i=0; i<local_npnb; ++i ) |
---|
3122 | { |
---|
3123 | G4ReactionProduct * p1 = new G4ReactionProduct(); |
---|
3124 | if( backwardKinetic > local_epnb ) |
---|
3125 | { |
---|
3126 | delete p1; |
---|
3127 | break; |
---|
3128 | } |
---|
3129 | G4double ran = G4UniformRand(); |
---|
3130 | G4double kinetic = -ekin*std::log(ran) - cfa*(1.0+0.5*normal()); |
---|
3131 | if( kinetic < 0.0 )kinetic = -0.010*std::log(ran); |
---|
3132 | backwardKinetic += kinetic; |
---|
3133 | if( backwardKinetic > local_epnb ) |
---|
3134 | kinetic = std::max( kineticMinimum, local_epnb-(backwardKinetic-kinetic) ); |
---|
3135 | |
---|
3136 | if (G4UniformRand() > (1.0-atomicNumber/atomicWeight)) { |
---|
3137 | |
---|
3138 | // Boil off a proton if there are any left, otherwise a neutron |
---|
3139 | |
---|
3140 | if (PinNucleus > 0) { |
---|
3141 | p1->SetDefinition( aProton ); |
---|
3142 | PinNucleus--; |
---|
3143 | } else if (NinNucleus > 0) { |
---|
3144 | p1->SetDefinition( aNeutron ); |
---|
3145 | NinNucleus--; |
---|
3146 | } else { |
---|
3147 | delete p1; |
---|
3148 | break; // no nucleons left in nucleus |
---|
3149 | } |
---|
3150 | } else { |
---|
3151 | |
---|
3152 | // Boil off a neutron if there are any left, otherwise a proton |
---|
3153 | |
---|
3154 | if (NinNucleus > 0) { |
---|
3155 | p1->SetDefinition( aNeutron ); |
---|
3156 | NinNucleus--; |
---|
3157 | } else if (PinNucleus > 0) { |
---|
3158 | p1->SetDefinition( aProton ); |
---|
3159 | PinNucleus--; |
---|
3160 | } else { |
---|
3161 | delete p1; |
---|
3162 | break; // no nucleons left in nucleus |
---|
3163 | } |
---|
3164 | } |
---|
3165 | |
---|
3166 | vec.SetElement( vecLen, p1 ); |
---|
3167 | G4double cost = G4UniformRand() * 2.0 - 1.0; |
---|
3168 | G4double sint = std::sqrt(std::fabs(1.0-cost*cost)); |
---|
3169 | G4double phi = twopi * G4UniformRand(); |
---|
3170 | vec[vecLen]->SetNewlyAdded( true ); |
---|
3171 | vec[vecLen]->SetKineticEnergy( kinetic*GeV ); |
---|
3172 | kinCreated+=kinetic; |
---|
3173 | pp = vec[vecLen]->GetTotalMomentum()/MeV; |
---|
3174 | vec[vecLen]->SetMomentum( pp*sint*std::sin(phi)*MeV, |
---|
3175 | pp*sint*std::cos(phi)*MeV, |
---|
3176 | pp*cost*MeV ); |
---|
3177 | vecLen++; |
---|
3178 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
3179 | } |
---|
3180 | |
---|
3181 | if (NinNucleus > 0) { |
---|
3182 | if( (atomicWeight >= 10.0) && (ekOriginal <= 2.0*GeV) ) |
---|
3183 | { |
---|
3184 | G4double ekw = ekOriginal/GeV; |
---|
3185 | G4int ika, kk = 0; |
---|
3186 | if( ekw > 1.0 )ekw *= ekw; |
---|
3187 | ekw = std::max( 0.1, ekw ); |
---|
3188 | ika = G4int(ika1*std::exp((atomicNumber*atomicNumber/ |
---|
3189 | atomicWeight-ika2)/ika3)/ekw); |
---|
3190 | if( ika > 0 ) |
---|
3191 | { |
---|
3192 | for( i=(vecLen-1); i>=0; --i ) |
---|
3193 | { |
---|
3194 | if( (vec[i]->GetDefinition() == aProton) && vec[i]->GetNewlyAdded() ) |
---|
3195 | { |
---|
3196 | vec[i]->SetDefinitionAndUpdateE( aNeutron ); // modified 22-Oct-97 |
---|
3197 | PinNucleus++; |
---|
3198 | NinNucleus--; |
---|
3199 | if( ++kk > ika )break; |
---|
3200 | } |
---|
3201 | } |
---|
3202 | } |
---|
3203 | } |
---|
3204 | } // if (NinNucleus >0) |
---|
3205 | } // if (npnb > 0) |
---|
3206 | |
---|
3207 | // Next try to add deuterons, tritons and alphas to final state |
---|
3208 | |
---|
3209 | if (ndta > 0) |
---|
3210 | { |
---|
3211 | G4double backwardKinetic = 0.0; |
---|
3212 | G4int local_ndta=ndta; |
---|
3213 | for( i=0; i<ndta; ++i )if( G4UniformRand() < sprob )local_ndta--; |
---|
3214 | G4double local_edta = edta; |
---|
3215 | if (npnb == 0) local_edta += epnb; // Retrieve unused kinetic energy |
---|
3216 | G4double ekin = local_edta/std::max(1,local_ndta); |
---|
3217 | |
---|
3218 | for( i=0; i<local_ndta; ++i ) |
---|
3219 | { |
---|
3220 | G4ReactionProduct *p2 = new G4ReactionProduct(); |
---|
3221 | if( backwardKinetic > local_edta ) |
---|
3222 | { |
---|
3223 | delete p2; |
---|
3224 | break; |
---|
3225 | } |
---|
3226 | G4double ran = G4UniformRand(); |
---|
3227 | G4double kinetic = -ekin*std::log(ran)-cfa*(1.+0.5*normal()); |
---|
3228 | if( kinetic < 0.0 )kinetic = kineticFactor*std::log(ran); |
---|
3229 | backwardKinetic += kinetic; |
---|
3230 | if( backwardKinetic > local_edta )kinetic = local_edta-(backwardKinetic-kinetic); |
---|
3231 | if( kinetic < 0.0 )kinetic = kineticMinimum; |
---|
3232 | G4double cost = 2.0*G4UniformRand() - 1.0; |
---|
3233 | G4double sint = std::sqrt(std::max(0.0,(1.0-cost*cost))); |
---|
3234 | G4double phi = twopi*G4UniformRand(); |
---|
3235 | ran = G4UniformRand(); |
---|
3236 | if (ran < 0.60) { |
---|
3237 | if (PinNucleus > 0 && NinNucleus > 0) { |
---|
3238 | p2->SetDefinition( aDeuteron ); |
---|
3239 | PinNucleus--; |
---|
3240 | NinNucleus--; |
---|
3241 | } else if (NinNucleus > 0) { |
---|
3242 | p2->SetDefinition( aNeutron ); |
---|
3243 | NinNucleus--; |
---|
3244 | } else if (PinNucleus > 0) { |
---|
3245 | p2->SetDefinition( aProton ); |
---|
3246 | PinNucleus--; |
---|
3247 | } else { |
---|
3248 | delete p2; |
---|
3249 | break; |
---|
3250 | } |
---|
3251 | } else if (ran < 0.90) { |
---|
3252 | if (PinNucleus > 0 && NinNucleus > 1) { |
---|
3253 | p2->SetDefinition( aTriton ); |
---|
3254 | PinNucleus--; |
---|
3255 | NinNucleus -= 2; |
---|
3256 | } else if (PinNucleus > 0 && NinNucleus > 0) { |
---|
3257 | p2->SetDefinition( aDeuteron ); |
---|
3258 | PinNucleus--; |
---|
3259 | NinNucleus--; |
---|
3260 | } else if (NinNucleus > 0) { |
---|
3261 | p2->SetDefinition( aNeutron ); |
---|
3262 | NinNucleus--; |
---|
3263 | } else if (PinNucleus > 0) { |
---|
3264 | p2->SetDefinition( aProton ); |
---|
3265 | PinNucleus--; |
---|
3266 | } else { |
---|
3267 | delete p2; |
---|
3268 | break; |
---|
3269 | } |
---|
3270 | } else { |
---|
3271 | if (PinNucleus > 1 && NinNucleus > 1) { |
---|
3272 | p2->SetDefinition( anAlpha ); |
---|
3273 | PinNucleus -= 2; |
---|
3274 | NinNucleus -= 2; |
---|
3275 | } else if (PinNucleus > 0 && NinNucleus > 1) { |
---|
3276 | p2->SetDefinition( aTriton ); |
---|
3277 | PinNucleus--; |
---|
3278 | NinNucleus -= 2; |
---|
3279 | } else if (PinNucleus > 0 && NinNucleus > 0) { |
---|
3280 | p2->SetDefinition( aDeuteron ); |
---|
3281 | PinNucleus--; |
---|
3282 | NinNucleus--; |
---|
3283 | } else if (NinNucleus > 0) { |
---|
3284 | p2->SetDefinition( aNeutron ); |
---|
3285 | NinNucleus--; |
---|
3286 | } else if (PinNucleus > 0) { |
---|
3287 | p2->SetDefinition( aProton ); |
---|
3288 | PinNucleus--; |
---|
3289 | } else { |
---|
3290 | delete p2; |
---|
3291 | break; |
---|
3292 | } |
---|
3293 | } |
---|
3294 | |
---|
3295 | vec.SetElement( vecLen, p2 ); |
---|
3296 | vec[vecLen]->SetNewlyAdded( true ); |
---|
3297 | vec[vecLen]->SetKineticEnergy( kinetic*GeV ); |
---|
3298 | kinCreated+=kinetic; |
---|
3299 | pp = vec[vecLen]->GetTotalMomentum()/MeV; |
---|
3300 | vec[vecLen++]->SetMomentum( pp*sint*std::sin(phi)*MeV, |
---|
3301 | pp*sint*std::cos(phi)*MeV, |
---|
3302 | pp*cost*MeV ); |
---|
3303 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
3304 | } |
---|
3305 | } // if (ndta > 0) |
---|
3306 | |
---|
3307 | // G4double delta = epnb+edta - kinCreated; |
---|
3308 | } |
---|
3309 | |
---|
3310 | |
---|
3311 | std::pair<G4int, G4int> G4ReactionDynamics::GetFinalStateNucleons( |
---|
3312 | const G4DynamicParticle* originalTarget, |
---|
3313 | const G4FastVector<G4ReactionProduct,GHADLISTSIZE>& vec, |
---|
3314 | const G4int& vecLen) |
---|
3315 | { |
---|
3316 | // Get number of protons and neutrons removed from the target nucleus |
---|
3317 | |
---|
3318 | G4int protonsRemoved = 0; |
---|
3319 | G4int neutronsRemoved = 0; |
---|
3320 | if (originalTarget->GetDefinition()->GetParticleName() == "proton") |
---|
3321 | protonsRemoved++; |
---|
3322 | else |
---|
3323 | neutronsRemoved++; |
---|
3324 | |
---|
3325 | G4String secName; |
---|
3326 | for (G4int i = 0; i < vecLen; i++) { |
---|
3327 | secName = vec[i]->GetDefinition()->GetParticleName(); |
---|
3328 | if (secName == "proton") { |
---|
3329 | protonsRemoved++; |
---|
3330 | } else if (secName == "neutron") { |
---|
3331 | neutronsRemoved++; |
---|
3332 | } else if (secName == "anti_proton") { |
---|
3333 | protonsRemoved--; |
---|
3334 | } else if (secName == "anti_neutron") { |
---|
3335 | neutronsRemoved--; |
---|
3336 | } |
---|
3337 | } |
---|
3338 | |
---|
3339 | return std::pair<G4int, G4int>(protonsRemoved, neutronsRemoved); |
---|
3340 | } |
---|
3341 | |
---|
3342 | |
---|
3343 | void G4ReactionDynamics::MomentumCheck( |
---|
3344 | const G4ReactionProduct &modifiedOriginal, |
---|
3345 | G4ReactionProduct ¤tParticle, |
---|
3346 | G4ReactionProduct &targetParticle, |
---|
3347 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> &vec, |
---|
3348 | G4int &vecLen ) |
---|
3349 | { |
---|
3350 | const G4double pOriginal = modifiedOriginal.GetTotalMomentum()/MeV; |
---|
3351 | G4double testMomentum = currentParticle.GetMomentum().mag()/MeV; |
---|
3352 | G4double pMass; |
---|
3353 | if( testMomentum >= pOriginal ) |
---|
3354 | { |
---|
3355 | pMass = currentParticle.GetMass()/MeV; |
---|
3356 | currentParticle.SetTotalEnergy( |
---|
3357 | std::sqrt( pMass*pMass + pOriginal*pOriginal )*MeV ); |
---|
3358 | currentParticle.SetMomentum( |
---|
3359 | currentParticle.GetMomentum() * (pOriginal/testMomentum) ); |
---|
3360 | } |
---|
3361 | testMomentum = targetParticle.GetMomentum().mag()/MeV; |
---|
3362 | if( testMomentum >= pOriginal ) |
---|
3363 | { |
---|
3364 | pMass = targetParticle.GetMass()/MeV; |
---|
3365 | targetParticle.SetTotalEnergy( |
---|
3366 | std::sqrt( pMass*pMass + pOriginal*pOriginal )*MeV ); |
---|
3367 | targetParticle.SetMomentum( |
---|
3368 | targetParticle.GetMomentum() * (pOriginal/testMomentum) ); |
---|
3369 | } |
---|
3370 | for( G4int i=0; i<vecLen; ++i ) |
---|
3371 | { |
---|
3372 | testMomentum = vec[i]->GetMomentum().mag()/MeV; |
---|
3373 | if( testMomentum >= pOriginal ) |
---|
3374 | { |
---|
3375 | pMass = vec[i]->GetMass()/MeV; |
---|
3376 | vec[i]->SetTotalEnergy( |
---|
3377 | std::sqrt( pMass*pMass + pOriginal*pOriginal )*MeV ); |
---|
3378 | vec[i]->SetMomentum( vec[i]->GetMomentum() * (pOriginal/testMomentum) ); |
---|
3379 | } |
---|
3380 | } |
---|
3381 | } |
---|
3382 | |
---|
3383 | void G4ReactionDynamics::ProduceStrangeParticlePairs( |
---|
3384 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> &vec, |
---|
3385 | G4int &vecLen, |
---|
3386 | const G4ReactionProduct &modifiedOriginal, |
---|
3387 | const G4DynamicParticle *originalTarget, |
---|
3388 | G4ReactionProduct ¤tParticle, |
---|
3389 | G4ReactionProduct &targetParticle, |
---|
3390 | G4bool &incidentHasChanged, |
---|
3391 | G4bool &targetHasChanged ) |
---|
3392 | { |
---|
3393 | // derived from original FORTRAN code STPAIR by H. Fesefeldt (16-Dec-1987) |
---|
3394 | // |
---|
3395 | // Choose charge combinations K+ K-, K+ K0B, K0 K0B, K0 K-, |
---|
3396 | // K+ Y0, K0 Y+, K0 Y- |
---|
3397 | // For antibaryon induced reactions half of the cross sections KB YB |
---|
3398 | // pairs are produced. Charge is not conserved, no experimental data available |
---|
3399 | // for exclusive reactions, therefore some average behaviour assumed. |
---|
3400 | // The ratio L/SIGMA is taken as 3:1 (from experimental low energy) |
---|
3401 | // |
---|
3402 | if( vecLen == 0 )return; |
---|
3403 | // |
---|
3404 | // the following protects against annihilation processes |
---|
3405 | // |
---|
3406 | if( currentParticle.GetMass() == 0.0 || targetParticle.GetMass() == 0.0 )return; |
---|
3407 | |
---|
3408 | const G4double etOriginal = modifiedOriginal.GetTotalEnergy()/GeV; |
---|
3409 | const G4double mOriginal = modifiedOriginal.GetDefinition()->GetPDGMass()/GeV; |
---|
3410 | G4double targetMass = originalTarget->GetDefinition()->GetPDGMass()/GeV; |
---|
3411 | G4double centerofmassEnergy = std::sqrt( mOriginal*mOriginal + |
---|
3412 | targetMass*targetMass + |
---|
3413 | 2.0*targetMass*etOriginal ); // GeV |
---|
3414 | G4double currentMass = currentParticle.GetMass()/GeV; |
---|
3415 | G4double availableEnergy = centerofmassEnergy-(targetMass+currentMass); |
---|
3416 | if( availableEnergy <= 1.0 )return; |
---|
3417 | |
---|
3418 | G4ParticleDefinition *aProton = G4Proton::Proton(); |
---|
3419 | G4ParticleDefinition *anAntiProton = G4AntiProton::AntiProton(); |
---|
3420 | G4ParticleDefinition *aNeutron = G4Neutron::Neutron(); |
---|
3421 | G4ParticleDefinition *anAntiNeutron = G4AntiNeutron::AntiNeutron(); |
---|
3422 | G4ParticleDefinition *aSigmaMinus = G4SigmaMinus::SigmaMinus(); |
---|
3423 | G4ParticleDefinition *aSigmaPlus = G4SigmaPlus::SigmaPlus(); |
---|
3424 | G4ParticleDefinition *aSigmaZero = G4SigmaZero::SigmaZero(); |
---|
3425 | G4ParticleDefinition *anAntiSigmaMinus = G4AntiSigmaMinus::AntiSigmaMinus(); |
---|
3426 | G4ParticleDefinition *anAntiSigmaPlus = G4AntiSigmaPlus::AntiSigmaPlus(); |
---|
3427 | G4ParticleDefinition *anAntiSigmaZero = G4AntiSigmaZero::AntiSigmaZero(); |
---|
3428 | G4ParticleDefinition *aKaonMinus = G4KaonMinus::KaonMinus(); |
---|
3429 | G4ParticleDefinition *aKaonPlus = G4KaonPlus::KaonPlus(); |
---|
3430 | G4ParticleDefinition *aKaonZL = G4KaonZeroLong::KaonZeroLong(); |
---|
3431 | G4ParticleDefinition *aKaonZS = G4KaonZeroShort::KaonZeroShort(); |
---|
3432 | G4ParticleDefinition *aLambda = G4Lambda::Lambda(); |
---|
3433 | G4ParticleDefinition *anAntiLambda = G4AntiLambda::AntiLambda(); |
---|
3434 | |
---|
3435 | const G4double protonMass = aProton->GetPDGMass()/GeV; |
---|
3436 | const G4double sigmaMinusMass = aSigmaMinus->GetPDGMass()/GeV; |
---|
3437 | // |
---|
3438 | // determine the center of mass energy bin |
---|
3439 | // |
---|
3440 | const G4double avrs[] = {3.,4.,5.,6.,7.,8.,9.,10.,20.,30.,40.,50.}; |
---|
3441 | |
---|
3442 | G4int ibin, i3, i4; |
---|
3443 | G4double avk, avy, avn, ran; |
---|
3444 | G4int i = 1; |
---|
3445 | while( (i<12) && (centerofmassEnergy>avrs[i]) )++i; |
---|
3446 | if( i == 12 ) |
---|
3447 | ibin = 11; |
---|
3448 | else |
---|
3449 | ibin = i; |
---|
3450 | // |
---|
3451 | // the fortran code chooses a random replacement of produced kaons |
---|
3452 | // but does not take into account charge conservation |
---|
3453 | // |
---|
3454 | if( vecLen == 1 ) // we know that vecLen > 0 |
---|
3455 | { |
---|
3456 | i3 = 0; |
---|
3457 | i4 = 1; // note that we will be adding a new secondary particle in this case only |
---|
3458 | } |
---|
3459 | else // otherwise 0 <= i3,i4 < vecLen |
---|
3460 | { |
---|
3461 | G4double ran = G4UniformRand(); |
---|
3462 | while( ran == 1.0 )ran = G4UniformRand(); |
---|
3463 | i4 = i3 = G4int( vecLen*ran ); |
---|
3464 | while( i3 == i4 ) |
---|
3465 | { |
---|
3466 | ran = G4UniformRand(); |
---|
3467 | while( ran == 1.0 )ran = G4UniformRand(); |
---|
3468 | i4 = G4int( vecLen*ran ); |
---|
3469 | } |
---|
3470 | } |
---|
3471 | // |
---|
3472 | // use linear interpolation or extrapolation by y=centerofmassEnergy*x+b |
---|
3473 | // |
---|
3474 | const G4double avkkb[] = { 0.0015, 0.005, 0.012, 0.0285, 0.0525, 0.075, |
---|
3475 | 0.0975, 0.123, 0.28, 0.398, 0.495, 0.573 }; |
---|
3476 | const G4double avky[] = { 0.005, 0.03, 0.064, 0.095, 0.115, 0.13, |
---|
3477 | 0.145, 0.155, 0.20, 0.205, 0.210, 0.212 }; |
---|
3478 | const G4double avnnb[] = { 0.00001, 0.0001, 0.0006, 0.0025, 0.01, 0.02, |
---|
3479 | 0.04, 0.05, 0.12, 0.15, 0.18, 0.20 }; |
---|
3480 | |
---|
3481 | avk = (std::log(avkkb[ibin])-std::log(avkkb[ibin-1]))*(centerofmassEnergy-avrs[ibin-1]) |
---|
3482 | /(avrs[ibin]-avrs[ibin-1]) + std::log(avkkb[ibin-1]); |
---|
3483 | avk = std::exp(avk); |
---|
3484 | |
---|
3485 | avy = (std::log(avky[ibin])-std::log(avky[ibin-1]))*(centerofmassEnergy-avrs[ibin-1]) |
---|
3486 | /(avrs[ibin]-avrs[ibin-1]) + std::log(avky[ibin-1]); |
---|
3487 | avy = std::exp(avy); |
---|
3488 | |
---|
3489 | avn = (std::log(avnnb[ibin])-std::log(avnnb[ibin-1]))*(centerofmassEnergy-avrs[ibin-1]) |
---|
3490 | /(avrs[ibin]-avrs[ibin-1]) + std::log(avnnb[ibin-1]); |
---|
3491 | avn = std::exp(avn); |
---|
3492 | |
---|
3493 | if( avk+avy+avn <= 0.0 )return; |
---|
3494 | |
---|
3495 | if( currentMass < protonMass )avy /= 2.0; |
---|
3496 | if( targetMass < protonMass )avy = 0.0; |
---|
3497 | avy += avk+avn; |
---|
3498 | avk += avn; |
---|
3499 | ran = G4UniformRand(); |
---|
3500 | if( ran < avn ) |
---|
3501 | { |
---|
3502 | if( availableEnergy < 2.0 )return; |
---|
3503 | if( vecLen == 1 ) // add a new secondary |
---|
3504 | { |
---|
3505 | G4ReactionProduct *p1 = new G4ReactionProduct; |
---|
3506 | if( G4UniformRand() < 0.5 ) |
---|
3507 | { |
---|
3508 | vec[0]->SetDefinition( aNeutron ); |
---|
3509 | p1->SetDefinition( anAntiNeutron ); |
---|
3510 | (G4UniformRand() < 0.5) ? p1->SetSide( -1 ) : p1->SetSide( 1 ); |
---|
3511 | vec[0]->SetMayBeKilled(false); |
---|
3512 | p1->SetMayBeKilled(false); |
---|
3513 | } |
---|
3514 | else |
---|
3515 | { |
---|
3516 | vec[0]->SetDefinition( aProton ); |
---|
3517 | p1->SetDefinition( anAntiProton ); |
---|
3518 | (G4UniformRand() < 0.5) ? p1->SetSide( -1 ) : p1->SetSide( 1 ); |
---|
3519 | vec[0]->SetMayBeKilled(false); |
---|
3520 | p1->SetMayBeKilled(false); |
---|
3521 | } |
---|
3522 | vec.SetElement( vecLen++, p1 ); |
---|
3523 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
3524 | } |
---|
3525 | else |
---|
3526 | { // replace two secondaries |
---|
3527 | if( G4UniformRand() < 0.5 ) |
---|
3528 | { |
---|
3529 | vec[i3]->SetDefinition( aNeutron ); |
---|
3530 | vec[i4]->SetDefinition( anAntiNeutron ); |
---|
3531 | vec[i3]->SetMayBeKilled(false); |
---|
3532 | vec[i4]->SetMayBeKilled(false); |
---|
3533 | } |
---|
3534 | else |
---|
3535 | { |
---|
3536 | vec[i3]->SetDefinition( aProton ); |
---|
3537 | vec[i4]->SetDefinition( anAntiProton ); |
---|
3538 | vec[i3]->SetMayBeKilled(false); |
---|
3539 | vec[i4]->SetMayBeKilled(false); |
---|
3540 | } |
---|
3541 | } |
---|
3542 | } |
---|
3543 | else if( ran < avk ) |
---|
3544 | { |
---|
3545 | if( availableEnergy < 1.0 )return; |
---|
3546 | |
---|
3547 | const G4double kkb[] = { 0.2500, 0.3750, 0.5000, 0.5625, 0.6250, |
---|
3548 | 0.6875, 0.7500, 0.8750, 1.000 }; |
---|
3549 | const G4int ipakkb1[] = { 10, 10, 10, 11, 11, 12, 12, 11, 12 }; |
---|
3550 | const G4int ipakkb2[] = { 13, 11, 12, 11, 12, 11, 12, 13, 13 }; |
---|
3551 | ran = G4UniformRand(); |
---|
3552 | i = 0; |
---|
3553 | while( (i<9) && (ran>=kkb[i]) )++i; |
---|
3554 | if( i == 9 )return; |
---|
3555 | // |
---|
3556 | // ipakkb[] = { 10,13, 10,11, 10,12, 11,11, 11,12, 12,11, 12,12, 11,13, 12,13 }; |
---|
3557 | // charge + - + 0 + 0 0 0 0 0 0 0 0 0 0 - 0 - |
---|
3558 | // |
---|
3559 | switch( ipakkb1[i] ) |
---|
3560 | { |
---|
3561 | case 10: |
---|
3562 | vec[i3]->SetDefinition( aKaonPlus ); |
---|
3563 | vec[i3]->SetMayBeKilled(false); |
---|
3564 | break; |
---|
3565 | case 11: |
---|
3566 | vec[i3]->SetDefinition( aKaonZS ); |
---|
3567 | vec[i3]->SetMayBeKilled(false); |
---|
3568 | break; |
---|
3569 | case 12: |
---|
3570 | vec[i3]->SetDefinition( aKaonZL ); |
---|
3571 | vec[i3]->SetMayBeKilled(false); |
---|
3572 | break; |
---|
3573 | } |
---|
3574 | if( vecLen == 1 ) // add a secondary |
---|
3575 | { |
---|
3576 | G4ReactionProduct *p1 = new G4ReactionProduct; |
---|
3577 | switch( ipakkb2[i] ) |
---|
3578 | { |
---|
3579 | case 11: |
---|
3580 | p1->SetDefinition( aKaonZS ); |
---|
3581 | p1->SetMayBeKilled(false); |
---|
3582 | break; |
---|
3583 | case 12: |
---|
3584 | p1->SetDefinition( aKaonZL ); |
---|
3585 | p1->SetMayBeKilled(false); |
---|
3586 | break; |
---|
3587 | case 13: |
---|
3588 | p1->SetDefinition( aKaonMinus ); |
---|
3589 | p1->SetMayBeKilled(false); |
---|
3590 | break; |
---|
3591 | } |
---|
3592 | (G4UniformRand() < 0.5) ? p1->SetSide( -1 ) : p1->SetSide( 1 ); |
---|
3593 | vec.SetElement( vecLen++, p1 ); |
---|
3594 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
3595 | } |
---|
3596 | else // replace |
---|
3597 | { |
---|
3598 | switch( ipakkb2[i] ) |
---|
3599 | { |
---|
3600 | case 11: |
---|
3601 | vec[i4]->SetDefinition( aKaonZS ); |
---|
3602 | vec[i4]->SetMayBeKilled(false); |
---|
3603 | break; |
---|
3604 | case 12: |
---|
3605 | vec[i4]->SetDefinition( aKaonZL ); |
---|
3606 | vec[i4]->SetMayBeKilled(false); |
---|
3607 | break; |
---|
3608 | case 13: |
---|
3609 | vec[i4]->SetDefinition( aKaonMinus ); |
---|
3610 | vec[i4]->SetMayBeKilled(false); |
---|
3611 | break; |
---|
3612 | } |
---|
3613 | } |
---|
3614 | } |
---|
3615 | else if( ran < avy ) |
---|
3616 | { |
---|
3617 | if( availableEnergy < 1.6 )return; |
---|
3618 | |
---|
3619 | const G4double ky[] = { 0.200, 0.300, 0.400, 0.550, 0.625, 0.700, |
---|
3620 | 0.800, 0.850, 0.900, 0.950, 0.975, 1.000 }; |
---|
3621 | const G4int ipaky1[] = { 18, 18, 18, 20, 20, 20, 21, 21, 21, 22, 22, 22 }; |
---|
3622 | const G4int ipaky2[] = { 10, 11, 12, 10, 11, 12, 10, 11, 12, 10, 11, 12 }; |
---|
3623 | const G4int ipakyb1[] = { 19, 19, 19, 23, 23, 23, 24, 24, 24, 25, 25, 25 }; |
---|
3624 | const G4int ipakyb2[] = { 13, 12, 11, 13, 12, 11, 13, 12, 11, 13, 12, 11 }; |
---|
3625 | ran = G4UniformRand(); |
---|
3626 | i = 0; |
---|
3627 | while( (i<12) && (ran>ky[i]) )++i; |
---|
3628 | if( i == 12 )return; |
---|
3629 | if( (currentMass<protonMass) || (G4UniformRand()<0.5) ) |
---|
3630 | { |
---|
3631 | // ipaky[] = { 18,10, 18,11, 18,12, 20,10, 20,11, 20,12, |
---|
3632 | // 0 + 0 0 0 0 + + + 0 + 0 |
---|
3633 | // |
---|
3634 | // 21,10, 21,11, 21,12, 22,10, 22,11, 22,12 } |
---|
3635 | // 0 + 0 0 0 0 - + - 0 - 0 |
---|
3636 | switch( ipaky1[i] ) |
---|
3637 | { |
---|
3638 | case 18: |
---|
3639 | targetParticle.SetDefinition( aLambda ); |
---|
3640 | break; |
---|
3641 | case 20: |
---|
3642 | targetParticle.SetDefinition( aSigmaPlus ); |
---|
3643 | break; |
---|
3644 | case 21: |
---|
3645 | targetParticle.SetDefinition( aSigmaZero ); |
---|
3646 | break; |
---|
3647 | case 22: |
---|
3648 | targetParticle.SetDefinition( aSigmaMinus ); |
---|
3649 | break; |
---|
3650 | } |
---|
3651 | targetHasChanged = true; |
---|
3652 | switch( ipaky2[i] ) |
---|
3653 | { |
---|
3654 | case 10: |
---|
3655 | vec[i3]->SetDefinition( aKaonPlus ); |
---|
3656 | vec[i3]->SetMayBeKilled(false); |
---|
3657 | break; |
---|
3658 | case 11: |
---|
3659 | vec[i3]->SetDefinition( aKaonZS ); |
---|
3660 | vec[i3]->SetMayBeKilled(false); |
---|
3661 | break; |
---|
3662 | case 12: |
---|
3663 | vec[i3]->SetDefinition( aKaonZL ); |
---|
3664 | vec[i3]->SetMayBeKilled(false); |
---|
3665 | break; |
---|
3666 | } |
---|
3667 | } |
---|
3668 | else // (currentMass >= protonMass) && (G4UniformRand() >= 0.5) |
---|
3669 | { |
---|
3670 | // ipakyb[] = { 19,13, 19,12, 19,11, 23,13, 23,12, 23,11, |
---|
3671 | // 24,13, 24,12, 24,11, 25,13, 25,12, 25,11 }; |
---|
3672 | if( (currentParticle.GetDefinition() == anAntiProton) || |
---|
3673 | (currentParticle.GetDefinition() == anAntiNeutron) || |
---|
3674 | (currentParticle.GetDefinition() == anAntiLambda) || |
---|
3675 | (currentMass > sigmaMinusMass) ) |
---|
3676 | { |
---|
3677 | switch( ipakyb1[i] ) |
---|
3678 | { |
---|
3679 | case 19: |
---|
3680 | currentParticle.SetDefinitionAndUpdateE( anAntiLambda ); |
---|
3681 | break; |
---|
3682 | case 23: |
---|
3683 | currentParticle.SetDefinitionAndUpdateE( anAntiSigmaPlus ); |
---|
3684 | break; |
---|
3685 | case 24: |
---|
3686 | currentParticle.SetDefinitionAndUpdateE( anAntiSigmaZero ); |
---|
3687 | break; |
---|
3688 | case 25: |
---|
3689 | currentParticle.SetDefinitionAndUpdateE( anAntiSigmaMinus ); |
---|
3690 | break; |
---|
3691 | } |
---|
3692 | incidentHasChanged = true; |
---|
3693 | switch( ipakyb2[i] ) |
---|
3694 | { |
---|
3695 | case 11: |
---|
3696 | vec[i3]->SetDefinition( aKaonZS ); |
---|
3697 | vec[i3]->SetMayBeKilled(false); |
---|
3698 | break; |
---|
3699 | case 12: |
---|
3700 | vec[i3]->SetDefinition( aKaonZL ); |
---|
3701 | vec[i3]->SetMayBeKilled(false); |
---|
3702 | break; |
---|
3703 | case 13: |
---|
3704 | vec[i3]->SetDefinition( aKaonMinus ); |
---|
3705 | vec[i3]->SetMayBeKilled(false); |
---|
3706 | break; |
---|
3707 | } |
---|
3708 | } |
---|
3709 | else |
---|
3710 | { |
---|
3711 | switch( ipaky1[i] ) |
---|
3712 | { |
---|
3713 | case 18: |
---|
3714 | currentParticle.SetDefinitionAndUpdateE( aLambda ); |
---|
3715 | break; |
---|
3716 | case 20: |
---|
3717 | currentParticle.SetDefinitionAndUpdateE( aSigmaPlus ); |
---|
3718 | break; |
---|
3719 | case 21: |
---|
3720 | currentParticle.SetDefinitionAndUpdateE( aSigmaZero ); |
---|
3721 | break; |
---|
3722 | case 22: |
---|
3723 | currentParticle.SetDefinitionAndUpdateE( aSigmaMinus ); |
---|
3724 | break; |
---|
3725 | } |
---|
3726 | incidentHasChanged = true; |
---|
3727 | switch( ipaky2[i] ) |
---|
3728 | { |
---|
3729 | case 10: |
---|
3730 | vec[i3]->SetDefinition( aKaonPlus ); |
---|
3731 | vec[i3]->SetMayBeKilled(false); |
---|
3732 | break; |
---|
3733 | case 11: |
---|
3734 | vec[i3]->SetDefinition( aKaonZS ); |
---|
3735 | vec[i3]->SetMayBeKilled(false); |
---|
3736 | break; |
---|
3737 | case 12: |
---|
3738 | vec[i3]->SetDefinition( aKaonZL ); |
---|
3739 | vec[i3]->SetMayBeKilled(false); |
---|
3740 | break; |
---|
3741 | } |
---|
3742 | } |
---|
3743 | } |
---|
3744 | } |
---|
3745 | else return; |
---|
3746 | // |
---|
3747 | // check the available energy |
---|
3748 | // if there is not enough energy for kkb/ky pair production |
---|
3749 | // then reduce the number of secondary particles |
---|
3750 | // NOTE: |
---|
3751 | // the number of secondaries may have been changed |
---|
3752 | // the incident and/or target particles may have changed |
---|
3753 | // charge conservation is ignored (as well as strangness conservation) |
---|
3754 | // |
---|
3755 | currentMass = currentParticle.GetMass()/GeV; |
---|
3756 | targetMass = targetParticle.GetMass()/GeV; |
---|
3757 | |
---|
3758 | G4double energyCheck = centerofmassEnergy-(currentMass+targetMass); |
---|
3759 | for( i=0; i<vecLen; ++i ) |
---|
3760 | { |
---|
3761 | energyCheck -= vec[i]->GetMass()/GeV; |
---|
3762 | if( energyCheck < 0.0 ) // chop off the secondary List |
---|
3763 | { |
---|
3764 | vecLen = std::max( 0, --i ); // looks like a memory leak @@@@@@@@@@@@ |
---|
3765 | G4int j; |
---|
3766 | for(j=i; j<vecLen; j++) delete vec[j]; |
---|
3767 | break; |
---|
3768 | } |
---|
3769 | } |
---|
3770 | return; |
---|
3771 | } |
---|
3772 | |
---|
3773 | void |
---|
3774 | G4ReactionDynamics::NuclearReaction( |
---|
3775 | G4FastVector<G4ReactionProduct,4> &vec, |
---|
3776 | G4int &vecLen, |
---|
3777 | const G4HadProjectile *originalIncident, |
---|
3778 | const G4Nucleus &targetNucleus, |
---|
3779 | const G4double theAtomicMass, |
---|
3780 | const G4double *mass ) |
---|
3781 | { |
---|
3782 | // derived from original FORTRAN code NUCREC by H. Fesefeldt (12-Feb-1987) |
---|
3783 | // |
---|
3784 | // Nuclear reaction kinematics at low energies |
---|
3785 | // |
---|
3786 | G4ParticleDefinition *aGamma = G4Gamma::Gamma(); |
---|
3787 | G4ParticleDefinition *aProton = G4Proton::Proton(); |
---|
3788 | G4ParticleDefinition *aNeutron = G4Neutron::Neutron(); |
---|
3789 | G4ParticleDefinition *aDeuteron = G4Deuteron::Deuteron(); |
---|
3790 | G4ParticleDefinition *aTriton = G4Triton::Triton(); |
---|
3791 | G4ParticleDefinition *anAlpha = G4Alpha::Alpha(); |
---|
3792 | |
---|
3793 | const G4double aProtonMass = aProton->GetPDGMass()/MeV; |
---|
3794 | const G4double aNeutronMass = aNeutron->GetPDGMass()/MeV; |
---|
3795 | const G4double aDeuteronMass = aDeuteron->GetPDGMass()/MeV; |
---|
3796 | const G4double aTritonMass = aTriton->GetPDGMass()/MeV; |
---|
3797 | const G4double anAlphaMass = anAlpha->GetPDGMass()/MeV; |
---|
3798 | |
---|
3799 | G4ReactionProduct currentParticle; |
---|
3800 | currentParticle = *originalIncident; |
---|
3801 | // |
---|
3802 | // Set beam particle, take kinetic energy of current particle as the |
---|
3803 | // fundamental quantity. Due to the difficult kinematic, all masses have to |
---|
3804 | // be assigned the best measured values |
---|
3805 | // |
---|
3806 | G4double p = currentParticle.GetTotalMomentum(); |
---|
3807 | G4double pp = currentParticle.GetMomentum().mag(); |
---|
3808 | if( pp <= 0.001*MeV ) |
---|
3809 | { |
---|
3810 | G4double phinve = twopi*G4UniformRand(); |
---|
3811 | G4double rthnve = std::acos( std::max( -1.0, std::min( 1.0, -1.0 + 2.0*G4UniformRand() ) ) ); |
---|
3812 | currentParticle.SetMomentum( p*std::sin(rthnve)*std::cos(phinve), |
---|
3813 | p*std::sin(rthnve)*std::sin(phinve), |
---|
3814 | p*std::cos(rthnve) ); |
---|
3815 | } |
---|
3816 | else |
---|
3817 | currentParticle.SetMomentum( currentParticle.GetMomentum() * (p/pp) ); |
---|
3818 | // |
---|
3819 | // calculate Q-value of reactions |
---|
3820 | // |
---|
3821 | G4double currentKinetic = currentParticle.GetKineticEnergy()/MeV; |
---|
3822 | G4double currentMass = currentParticle.GetDefinition()->GetPDGMass()/MeV; |
---|
3823 | G4double qv = currentKinetic + theAtomicMass + currentMass; |
---|
3824 | |
---|
3825 | G4double qval[9]; |
---|
3826 | qval[0] = qv - mass[0]; |
---|
3827 | qval[1] = qv - mass[1] - aNeutronMass; |
---|
3828 | qval[2] = qv - mass[2] - aProtonMass; |
---|
3829 | qval[3] = qv - mass[3] - aDeuteronMass; |
---|
3830 | qval[4] = qv - mass[4] - aTritonMass; |
---|
3831 | qval[5] = qv - mass[5] - anAlphaMass; |
---|
3832 | qval[6] = qv - mass[6] - aNeutronMass - aNeutronMass; |
---|
3833 | qval[7] = qv - mass[7] - aNeutronMass - aProtonMass; |
---|
3834 | qval[8] = qv - mass[8] - aProtonMass - aProtonMass; |
---|
3835 | |
---|
3836 | if( currentParticle.GetDefinition() == aNeutron ) |
---|
3837 | { |
---|
3838 | const G4double A = G4double(targetNucleus.GetA_asInt()); // atomic weight |
---|
3839 | if( G4UniformRand() > ((A-1.0)/230.0)*((A-1.0)/230.0) ) |
---|
3840 | qval[0] = 0.0; |
---|
3841 | if( G4UniformRand() >= currentKinetic/7.9254*A ) |
---|
3842 | qval[2] = qval[3] = qval[4] = qval[5] = qval[8] = 0.0; |
---|
3843 | } |
---|
3844 | else |
---|
3845 | qval[0] = 0.0; |
---|
3846 | |
---|
3847 | G4int i; |
---|
3848 | qv = 0.0; |
---|
3849 | for( i=0; i<9; ++i ) |
---|
3850 | { |
---|
3851 | if( mass[i] < 500.0*MeV )qval[i] = 0.0; |
---|
3852 | if( qval[i] < 0.0 )qval[i] = 0.0; |
---|
3853 | qv += qval[i]; |
---|
3854 | } |
---|
3855 | G4double qv1 = 0.0; |
---|
3856 | G4double ran = G4UniformRand(); |
---|
3857 | G4int index; |
---|
3858 | for( index=0; index<9; ++index ) |
---|
3859 | { |
---|
3860 | if( qval[index] > 0.0 ) |
---|
3861 | { |
---|
3862 | qv1 += qval[index]/qv; |
---|
3863 | if( ran <= qv1 )break; |
---|
3864 | } |
---|
3865 | } |
---|
3866 | if( index == 9 ) // loop continued to the end |
---|
3867 | { |
---|
3868 | throw G4HadronicException(__FILE__, __LINE__, |
---|
3869 | "G4ReactionDynamics::NuclearReaction: inelastic reaction kinematically not possible"); |
---|
3870 | } |
---|
3871 | G4double ke = currentParticle.GetKineticEnergy()/GeV; |
---|
3872 | G4int nt = 2; |
---|
3873 | if( (index>=6) || (G4UniformRand()<std::min(0.5,ke*10.0)) )nt = 3; |
---|
3874 | |
---|
3875 | G4ReactionProduct **v = new G4ReactionProduct * [3]; |
---|
3876 | v[0] = new G4ReactionProduct; |
---|
3877 | v[1] = new G4ReactionProduct; |
---|
3878 | v[2] = new G4ReactionProduct; |
---|
3879 | |
---|
3880 | v[0]->SetMass( mass[index]*MeV ); |
---|
3881 | switch( index ) |
---|
3882 | { |
---|
3883 | case 0: |
---|
3884 | v[1]->SetDefinition( aGamma ); |
---|
3885 | v[2]->SetDefinition( aGamma ); |
---|
3886 | break; |
---|
3887 | case 1: |
---|
3888 | v[1]->SetDefinition( aNeutron ); |
---|
3889 | v[2]->SetDefinition( aGamma ); |
---|
3890 | break; |
---|
3891 | case 2: |
---|
3892 | v[1]->SetDefinition( aProton ); |
---|
3893 | v[2]->SetDefinition( aGamma ); |
---|
3894 | break; |
---|
3895 | case 3: |
---|
3896 | v[1]->SetDefinition( aDeuteron ); |
---|
3897 | v[2]->SetDefinition( aGamma ); |
---|
3898 | break; |
---|
3899 | case 4: |
---|
3900 | v[1]->SetDefinition( aTriton ); |
---|
3901 | v[2]->SetDefinition( aGamma ); |
---|
3902 | break; |
---|
3903 | case 5: |
---|
3904 | v[1]->SetDefinition( anAlpha ); |
---|
3905 | v[2]->SetDefinition( aGamma ); |
---|
3906 | break; |
---|
3907 | case 6: |
---|
3908 | v[1]->SetDefinition( aNeutron ); |
---|
3909 | v[2]->SetDefinition( aNeutron ); |
---|
3910 | break; |
---|
3911 | case 7: |
---|
3912 | v[1]->SetDefinition( aNeutron ); |
---|
3913 | v[2]->SetDefinition( aProton ); |
---|
3914 | break; |
---|
3915 | case 8: |
---|
3916 | v[1]->SetDefinition( aProton ); |
---|
3917 | v[2]->SetDefinition( aProton ); |
---|
3918 | break; |
---|
3919 | } |
---|
3920 | // |
---|
3921 | // calculate centre of mass energy |
---|
3922 | // |
---|
3923 | G4ReactionProduct pseudo1; |
---|
3924 | pseudo1.SetMass( theAtomicMass*MeV ); |
---|
3925 | pseudo1.SetTotalEnergy( theAtomicMass*MeV ); |
---|
3926 | G4ReactionProduct pseudo2 = currentParticle + pseudo1; |
---|
3927 | pseudo2.SetMomentum( pseudo2.GetMomentum() * (-1.0) ); |
---|
3928 | // |
---|
3929 | // use phase space routine in centre of mass system |
---|
3930 | // |
---|
3931 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> tempV; |
---|
3932 | tempV.Initialize( nt ); |
---|
3933 | G4int tempLen = 0; |
---|
3934 | tempV.SetElement( tempLen++, v[0] ); |
---|
3935 | tempV.SetElement( tempLen++, v[1] ); |
---|
3936 | if( nt == 3 )tempV.SetElement( tempLen++, v[2] ); |
---|
3937 | G4bool constantCrossSection = true; |
---|
3938 | GenerateNBodyEvent( pseudo2.GetMass()/MeV, constantCrossSection, tempV, tempLen ); |
---|
3939 | v[0]->Lorentz( *v[0], pseudo2 ); |
---|
3940 | v[1]->Lorentz( *v[1], pseudo2 ); |
---|
3941 | if( nt == 3 )v[2]->Lorentz( *v[2], pseudo2 ); |
---|
3942 | |
---|
3943 | G4bool particleIsDefined = false; |
---|
3944 | if( v[0]->GetMass()/MeV - aProtonMass < 0.1 ) |
---|
3945 | { |
---|
3946 | v[0]->SetDefinition( aProton ); |
---|
3947 | particleIsDefined = true; |
---|
3948 | } |
---|
3949 | else if( v[0]->GetMass()/MeV - aNeutronMass < 0.1 ) |
---|
3950 | { |
---|
3951 | v[0]->SetDefinition( aNeutron ); |
---|
3952 | particleIsDefined = true; |
---|
3953 | } |
---|
3954 | else if( v[0]->GetMass()/MeV - aDeuteronMass < 0.1 ) |
---|
3955 | { |
---|
3956 | v[0]->SetDefinition( aDeuteron ); |
---|
3957 | particleIsDefined = true; |
---|
3958 | } |
---|
3959 | else if( v[0]->GetMass()/MeV - aTritonMass < 0.1 ) |
---|
3960 | { |
---|
3961 | v[0]->SetDefinition( aTriton ); |
---|
3962 | particleIsDefined = true; |
---|
3963 | } |
---|
3964 | else if( v[0]->GetMass()/MeV - anAlphaMass < 0.1 ) |
---|
3965 | { |
---|
3966 | v[0]->SetDefinition( anAlpha ); |
---|
3967 | particleIsDefined = true; |
---|
3968 | } |
---|
3969 | currentParticle.SetKineticEnergy( |
---|
3970 | std::max( 0.001, currentParticle.GetKineticEnergy()/MeV ) ); |
---|
3971 | p = currentParticle.GetTotalMomentum(); |
---|
3972 | pp = currentParticle.GetMomentum().mag(); |
---|
3973 | if( pp <= 0.001*MeV ) |
---|
3974 | { |
---|
3975 | G4double phinve = twopi*G4UniformRand(); |
---|
3976 | G4double rthnve = std::acos( std::max( -1.0, std::min( 1.0, -1.0 + 2.0*G4UniformRand() ) ) ); |
---|
3977 | currentParticle.SetMomentum( p*std::sin(rthnve)*std::cos(phinve), |
---|
3978 | p*std::sin(rthnve)*std::sin(phinve), |
---|
3979 | p*std::cos(rthnve) ); |
---|
3980 | } |
---|
3981 | else |
---|
3982 | currentParticle.SetMomentum( currentParticle.GetMomentum() * (p/pp) ); |
---|
3983 | |
---|
3984 | if( particleIsDefined ) |
---|
3985 | { |
---|
3986 | v[0]->SetKineticEnergy( |
---|
3987 | std::max( 0.001, 0.5*G4UniformRand()*v[0]->GetKineticEnergy()/MeV ) ); |
---|
3988 | p = v[0]->GetTotalMomentum(); |
---|
3989 | pp = v[0]->GetMomentum().mag(); |
---|
3990 | if( pp <= 0.001*MeV ) |
---|
3991 | { |
---|
3992 | G4double phinve = twopi*G4UniformRand(); |
---|
3993 | G4double rthnve = std::acos( std::max(-1.0,std::min(1.0,-1.0+2.0*G4UniformRand())) ); |
---|
3994 | v[0]->SetMomentum( p*std::sin(rthnve)*std::cos(phinve), |
---|
3995 | p*std::sin(rthnve)*std::sin(phinve), |
---|
3996 | p*std::cos(rthnve) ); |
---|
3997 | } |
---|
3998 | else |
---|
3999 | v[0]->SetMomentum( v[0]->GetMomentum() * (p/pp) ); |
---|
4000 | } |
---|
4001 | if( (v[1]->GetDefinition() == aDeuteron) || |
---|
4002 | (v[1]->GetDefinition() == aTriton) || |
---|
4003 | (v[1]->GetDefinition() == anAlpha) ) |
---|
4004 | v[1]->SetKineticEnergy( |
---|
4005 | std::max( 0.001, 0.5*G4UniformRand()*v[1]->GetKineticEnergy()/MeV ) ); |
---|
4006 | else |
---|
4007 | v[1]->SetKineticEnergy( std::max( 0.001, v[1]->GetKineticEnergy()/MeV ) ); |
---|
4008 | |
---|
4009 | p = v[1]->GetTotalMomentum(); |
---|
4010 | pp = v[1]->GetMomentum().mag(); |
---|
4011 | if( pp <= 0.001*MeV ) |
---|
4012 | { |
---|
4013 | G4double phinve = twopi*G4UniformRand(); |
---|
4014 | G4double rthnve = std::acos( std::max(-1.0,std::min(1.0,-1.0+2.0*G4UniformRand())) ); |
---|
4015 | v[1]->SetMomentum( p*std::sin(rthnve)*std::cos(phinve), |
---|
4016 | p*std::sin(rthnve)*std::sin(phinve), |
---|
4017 | p*std::cos(rthnve) ); |
---|
4018 | } |
---|
4019 | else |
---|
4020 | v[1]->SetMomentum( v[1]->GetMomentum() * (p/pp) ); |
---|
4021 | |
---|
4022 | if( nt == 3 ) |
---|
4023 | { |
---|
4024 | if( (v[2]->GetDefinition() == aDeuteron) || |
---|
4025 | (v[2]->GetDefinition() == aTriton) || |
---|
4026 | (v[2]->GetDefinition() == anAlpha) ) |
---|
4027 | v[2]->SetKineticEnergy( |
---|
4028 | std::max( 0.001, 0.5*G4UniformRand()*v[2]->GetKineticEnergy()/MeV ) ); |
---|
4029 | else |
---|
4030 | v[2]->SetKineticEnergy( std::max( 0.001, v[2]->GetKineticEnergy()/MeV ) ); |
---|
4031 | |
---|
4032 | p = v[2]->GetTotalMomentum(); |
---|
4033 | pp = v[2]->GetMomentum().mag(); |
---|
4034 | if( pp <= 0.001*MeV ) |
---|
4035 | { |
---|
4036 | G4double phinve = twopi*G4UniformRand(); |
---|
4037 | G4double rthnve = std::acos( std::max(-1.0,std::min(1.0,-1.0+2.0*G4UniformRand())) ); |
---|
4038 | v[2]->SetMomentum( p*std::sin(rthnve)*std::cos(phinve), |
---|
4039 | p*std::sin(rthnve)*std::sin(phinve), |
---|
4040 | p*std::cos(rthnve) ); |
---|
4041 | } |
---|
4042 | else |
---|
4043 | v[2]->SetMomentum( v[2]->GetMomentum() * (p/pp) ); |
---|
4044 | } |
---|
4045 | G4int del; |
---|
4046 | for(del=0; del<vecLen; del++) delete vec[del]; |
---|
4047 | vecLen = 0; |
---|
4048 | if( particleIsDefined ) |
---|
4049 | { |
---|
4050 | vec.SetElement( vecLen++, v[0] ); |
---|
4051 | } |
---|
4052 | else |
---|
4053 | { |
---|
4054 | delete v[0]; |
---|
4055 | } |
---|
4056 | vec.SetElement( vecLen++, v[1] ); |
---|
4057 | if( nt == 3 ) |
---|
4058 | { |
---|
4059 | vec.SetElement( vecLen++, v[2] ); |
---|
4060 | } |
---|
4061 | else |
---|
4062 | { |
---|
4063 | delete v[2]; |
---|
4064 | } |
---|
4065 | delete [] v; |
---|
4066 | return; |
---|
4067 | } |
---|
4068 | |
---|
4069 | /* end of file */ |
---|
4070 | |
---|