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 | // $Id: G4RPGKMinusInelastic.cc,v 1.1 2007/07/18 21:04:20 dennis Exp $ |
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27 | // GEANT4 tag $Name: geant4-09-03 $ |
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28 | // |
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29 | |
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30 | #include "G4RPGKMinusInelastic.hh" |
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31 | #include "Randomize.hh" |
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32 | |
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33 | G4HadFinalState* |
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34 | G4RPGKMinusInelastic::ApplyYourself( const G4HadProjectile &aTrack, |
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35 | G4Nucleus &targetNucleus ) |
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36 | { |
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37 | const G4HadProjectile *originalIncident = &aTrack; |
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38 | if (originalIncident->GetKineticEnergy()<= 0.1*MeV) |
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39 | { |
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40 | theParticleChange.SetStatusChange(isAlive); |
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41 | theParticleChange.SetEnergyChange(aTrack.GetKineticEnergy()); |
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42 | theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit()); |
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43 | return &theParticleChange; |
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44 | } |
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45 | |
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46 | // create the target particle |
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47 | |
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48 | G4DynamicParticle *originalTarget = targetNucleus.ReturnTargetParticle(); |
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49 | G4ReactionProduct targetParticle( originalTarget->GetDefinition() ); |
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50 | |
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51 | if( verboseLevel > 1 ) |
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52 | { |
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53 | const G4Material *targetMaterial = aTrack.GetMaterial(); |
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54 | G4cout << "G4RPGKMinusInelastic::ApplyYourself called" << G4endl; |
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55 | G4cout << "kinetic energy = " << originalIncident->GetKineticEnergy() << "MeV, "; |
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56 | G4cout << "target material = " << targetMaterial->GetName() << ", "; |
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57 | G4cout << "target particle = " << originalTarget->GetDefinition()->GetParticleName() |
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58 | << G4endl; |
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59 | } |
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60 | G4ReactionProduct currentParticle( const_cast<G4ParticleDefinition *>(originalIncident->GetDefinition()) ); |
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61 | currentParticle.SetMomentum( originalIncident->Get4Momentum().vect() ); |
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62 | currentParticle.SetKineticEnergy( originalIncident->GetKineticEnergy() ); |
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63 | |
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64 | // Fermi motion and evaporation |
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65 | // As of Geant3, the Fermi energy calculation had not been Done |
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66 | |
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67 | G4double ek = originalIncident->GetKineticEnergy(); |
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68 | G4double amas = originalIncident->GetDefinition()->GetPDGMass(); |
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69 | |
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70 | G4double tkin = targetNucleus.Cinema( ek ); |
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71 | ek += tkin; |
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72 | currentParticle.SetKineticEnergy( ek ); |
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73 | G4double et = ek + amas; |
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74 | G4double p = std::sqrt( std::abs((et-amas)*(et+amas)) ); |
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75 | G4double pp = currentParticle.GetMomentum().mag(); |
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76 | if( pp > 0.0 ) |
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77 | { |
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78 | G4ThreeVector momentum = currentParticle.GetMomentum(); |
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79 | currentParticle.SetMomentum( momentum * (p/pp) ); |
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80 | } |
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81 | |
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82 | // calculate black track energies |
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83 | |
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84 | tkin = targetNucleus.EvaporationEffects( ek ); |
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85 | ek -= tkin; |
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86 | currentParticle.SetKineticEnergy( ek ); |
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87 | et = ek + amas; |
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88 | p = std::sqrt( std::abs((et-amas)*(et+amas)) ); |
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89 | pp = currentParticle.GetMomentum().mag(); |
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90 | if( pp > 0.0 ) |
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91 | { |
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92 | G4ThreeVector momentum = currentParticle.GetMomentum(); |
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93 | currentParticle.SetMomentum( momentum * (p/pp) ); |
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94 | } |
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95 | |
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96 | G4ReactionProduct modifiedOriginal = currentParticle; |
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97 | |
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98 | currentParticle.SetSide( 1 ); // incident always goes in forward hemisphere |
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99 | targetParticle.SetSide( -1 ); // target always goes in backward hemisphere |
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100 | G4bool incidentHasChanged = false; |
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101 | G4bool targetHasChanged = false; |
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102 | G4bool quasiElastic = false; |
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103 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> vec; // vec will contain the secondary particles |
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104 | G4int vecLen = 0; |
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105 | vec.Initialize( 0 ); |
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106 | |
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107 | const G4double cutOff = 0.1*MeV; |
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108 | if( currentParticle.GetKineticEnergy() > cutOff ) |
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109 | Cascade( vec, vecLen, |
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110 | originalIncident, currentParticle, targetParticle, |
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111 | incidentHasChanged, targetHasChanged, quasiElastic ); |
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112 | |
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113 | CalculateMomenta( vec, vecLen, |
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114 | originalIncident, originalTarget, modifiedOriginal, |
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115 | targetNucleus, currentParticle, targetParticle, |
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116 | incidentHasChanged, targetHasChanged, quasiElastic ); |
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117 | |
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118 | SetUpChange( vec, vecLen, |
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119 | currentParticle, targetParticle, |
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120 | incidentHasChanged ); |
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121 | |
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122 | delete originalTarget; |
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123 | return &theParticleChange; |
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124 | } |
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125 | |
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126 | |
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127 | void G4RPGKMinusInelastic::Cascade( |
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128 | G4FastVector<G4ReactionProduct,GHADLISTSIZE> &vec, |
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129 | G4int& vecLen, |
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130 | const G4HadProjectile *originalIncident, |
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131 | G4ReactionProduct ¤tParticle, |
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132 | G4ReactionProduct &targetParticle, |
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133 | G4bool &incidentHasChanged, |
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134 | G4bool &targetHasChanged, |
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135 | G4bool &quasiElastic ) |
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136 | { |
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137 | // Derived from H. Fesefeldt's original FORTRAN code CASKM |
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138 | // |
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139 | // K- undergoes interaction with nucleon within a nucleus. Check if it is |
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140 | // energetically possible to produce pions/kaons. In not, assume nuclear excitation |
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141 | // occurs and input particle is degraded in energy. No other particles are produced. |
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142 | // If reaction is possible, find the correct number of pions/protons/neutrons |
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143 | // produced using an interpolation to multiplicity data. Replace some pions or |
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144 | // protons/neutrons by kaons or strange baryons according to the average |
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145 | // multiplicity per Inelastic reaction. |
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146 | // |
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147 | const G4double mOriginal = originalIncident->GetDefinition()->GetPDGMass(); |
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148 | const G4double etOriginal = originalIncident->GetTotalEnergy(); |
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149 | const G4double pOriginal = originalIncident->GetTotalMomentum(); |
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150 | const G4double targetMass = targetParticle.GetMass(); |
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151 | G4double centerofmassEnergy = std::sqrt( mOriginal*mOriginal + |
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152 | targetMass*targetMass + |
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153 | 2.0*targetMass*etOriginal ); |
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154 | G4double availableEnergy = centerofmassEnergy-(targetMass+mOriginal); |
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155 | |
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156 | static G4bool first = true; |
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157 | const G4int numMul = 1200; |
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158 | const G4int numSec = 60; |
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159 | static G4double protmul[numMul], protnorm[numSec]; // proton constants |
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160 | static G4double neutmul[numMul], neutnorm[numSec]; // neutron constants |
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161 | // np = number of pi+, nm = number of pi-, nz = number of pi0 |
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162 | G4int nt(0), np(0), nm(0), nz(0); |
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163 | const G4double c = 1.25; |
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164 | const G4double b[] = { 0.70, 0.70 }; |
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165 | if( first ) // compute normalization constants, this will only be Done once |
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166 | { |
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167 | first = false; |
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168 | G4int i; |
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169 | for( i=0; i<numMul; ++i )protmul[i] = 0.0; |
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170 | for( i=0; i<numSec; ++i )protnorm[i] = 0.0; |
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171 | G4int counter = -1; |
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172 | for( np=0; np<(numSec/3); ++np ) |
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173 | { |
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174 | for( nm=std::max(0,np-1); nm<=(np+1); ++nm ) |
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175 | { |
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176 | for( nz=0; nz<numSec/3; ++nz ) |
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177 | { |
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178 | if( ++counter < numMul ) |
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179 | { |
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180 | nt = np+nm+nz; |
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181 | if( (nt>0) && (nt<=numSec) ) |
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182 | { |
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183 | protmul[counter] = Pmltpc(np,nm,nz,nt,b[0],c); |
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184 | protnorm[nt-1] += protmul[counter]; |
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185 | } |
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186 | } |
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187 | } |
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188 | } |
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189 | } |
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190 | for( i=0; i<numMul; ++i )neutmul[i] = 0.0; |
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191 | for( i=0; i<numSec; ++i )neutnorm[i] = 0.0; |
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192 | counter = -1; |
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193 | for( np=0; np<numSec/3; ++np ) |
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194 | { |
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195 | for( nm=np; nm<=(np+2); ++nm ) |
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196 | { |
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197 | for( nz=0; nz<numSec/3; ++nz ) |
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198 | { |
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199 | if( ++counter < numMul ) |
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200 | { |
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201 | nt = np+nm+nz; |
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202 | if( (nt>0) && (nt<=numSec) ) |
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203 | { |
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204 | neutmul[counter] = Pmltpc(np,nm,nz,nt,b[1],c); |
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205 | neutnorm[nt-1] += neutmul[counter]; |
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206 | } |
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207 | } |
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208 | } |
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209 | } |
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210 | } |
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211 | for( i=0; i<numSec; ++i ) |
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212 | { |
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213 | if( protnorm[i] > 0.0 )protnorm[i] = 1.0/protnorm[i]; |
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214 | if( neutnorm[i] > 0.0 )neutnorm[i] = 1.0/neutnorm[i]; |
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215 | } |
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216 | } // end of initialization |
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217 | |
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218 | const G4double expxu = 82.; // upper bound for arg. of exp |
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219 | const G4double expxl = -expxu; // lower bound for arg. of exp |
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220 | G4ParticleDefinition *aKaonMinus = G4KaonMinus::KaonMinus(); |
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221 | G4ParticleDefinition *aKaonZS = G4KaonZeroShort::KaonZeroShort(); |
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222 | G4ParticleDefinition *aKaonZL = G4KaonZeroLong::KaonZeroLong(); |
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223 | G4ParticleDefinition *aNeutron = G4Neutron::Neutron(); |
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224 | G4ParticleDefinition *aProton = G4Proton::Proton(); |
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225 | G4ParticleDefinition *aPiPlus = G4PionPlus::PionPlus(); |
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226 | G4ParticleDefinition *aPiMinus = G4PionMinus::PionMinus(); |
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227 | G4ParticleDefinition *aPiZero = G4PionZero::PionZero(); |
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228 | G4ParticleDefinition *aLambda = G4Lambda::Lambda(); |
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229 | G4ParticleDefinition *aSigmaPlus = G4SigmaPlus::SigmaPlus(); |
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230 | G4ParticleDefinition *aSigmaMinus = G4SigmaMinus::SigmaMinus(); |
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231 | G4ParticleDefinition *aSigmaZero = G4SigmaZero::SigmaZero(); |
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232 | const G4double cech[] = {1.,1.,1.,0.70,0.60,0.55,0.35,0.25,0.18,0.15}; |
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233 | G4int iplab = G4int(std::min( 9.0, pOriginal/GeV*5.0 )); |
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234 | if( (pOriginal <= 2.0*GeV) && (G4UniformRand() < cech[iplab]) ) |
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235 | { |
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236 | np = nm = nz = nt = 0; |
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237 | iplab = G4int(std::min( 19.0, pOriginal/GeV*10.0 )); |
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238 | const G4double cnk0[] = {0.17,0.18,0.17,0.24,0.26,0.20,0.22,0.21,0.34,0.45, |
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239 | 0.58,0.55,0.36,0.29,0.29,0.32,0.32,0.33,0.33,0.33}; |
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240 | if( G4UniformRand() <= cnk0[iplab] ) |
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241 | { |
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242 | quasiElastic = true; |
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243 | if( targetParticle.GetDefinition() == aProton ) |
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244 | { |
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245 | currentParticle.SetDefinitionAndUpdateE( aKaonZL ); |
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246 | incidentHasChanged = true; |
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247 | targetParticle.SetDefinitionAndUpdateE( aNeutron ); |
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248 | targetHasChanged = true; |
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249 | } |
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250 | } |
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251 | else // random number > cnk0[iplab] |
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252 | { |
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253 | G4double ran = G4UniformRand(); |
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254 | if( ran < 0.25 ) // k- p --> pi- s+ |
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255 | { |
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256 | if( targetParticle.GetDefinition() == aProton ) |
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257 | { |
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258 | currentParticle.SetDefinitionAndUpdateE( aPiMinus ); |
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259 | targetParticle.SetDefinitionAndUpdateE( aSigmaPlus ); |
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260 | incidentHasChanged = true; |
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261 | targetHasChanged = true; |
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262 | } |
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263 | } |
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264 | else if( ran < 0.50 ) // k- p --> pi0 s0 or k- n --> pi- s0 |
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265 | { |
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266 | if( targetParticle.GetDefinition() == aNeutron ) |
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267 | currentParticle.SetDefinitionAndUpdateE( aPiMinus ); |
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268 | else |
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269 | currentParticle.SetDefinitionAndUpdateE( aPiZero ); |
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270 | targetParticle.SetDefinitionAndUpdateE( aSigmaZero ); |
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271 | incidentHasChanged = true; |
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272 | targetHasChanged = true; |
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273 | } |
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274 | else if( ran < 0.75 ) // k- p --> pi+ s- or k- n --> pi0 s- |
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275 | { |
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276 | if( targetParticle.GetDefinition() == aNeutron ) |
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277 | currentParticle.SetDefinitionAndUpdateE( aPiZero ); |
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278 | else |
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279 | currentParticle.SetDefinitionAndUpdateE( aPiPlus ); |
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280 | targetParticle.SetDefinitionAndUpdateE( aSigmaMinus ); |
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281 | incidentHasChanged = true; |
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282 | targetHasChanged = true; |
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283 | } |
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284 | else // k- p --> pi0 L or k- n --> pi- L |
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285 | { |
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286 | if( targetParticle.GetDefinition() == aNeutron ) |
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287 | currentParticle.SetDefinitionAndUpdateE( aPiMinus ); |
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288 | else |
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289 | currentParticle.SetDefinitionAndUpdateE( aPiZero ); |
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290 | targetParticle.SetDefinitionAndUpdateE( aLambda ); |
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291 | incidentHasChanged = true; |
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292 | targetHasChanged = true; |
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293 | } |
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294 | } |
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295 | } |
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296 | else // (pOriginal > 2.0*GeV) || (random number >= cech[iplab]) |
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297 | { |
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298 | if( availableEnergy < aPiPlus->GetPDGMass() ) |
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299 | { // not energetically possible to produce pion(s) |
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300 | quasiElastic = true; |
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301 | return; |
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302 | } |
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303 | G4double n, anpn; |
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304 | GetNormalizationConstant( availableEnergy, n, anpn ); |
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305 | G4double ran = G4UniformRand(); |
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306 | G4double dum, test, excs = 0.0; |
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307 | if( targetParticle.GetDefinition() == aProton ) |
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308 | { |
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309 | G4int counter = -1; |
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310 | for( np=0; np<numSec/3 && ran>=excs; ++np ) |
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311 | { |
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312 | for( nm=std::max(0,np-1); nm<=(np+1) && ran>=excs; ++nm ) |
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313 | { |
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314 | for( nz=0; nz<numSec/3 && ran>=excs; ++nz ) |
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315 | { |
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316 | if( ++counter < numMul ) |
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317 | { |
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318 | nt = np+nm+nz; |
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319 | if( nt > 0 ) |
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320 | { |
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321 | test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) ); |
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322 | dum = (pi/anpn)*nt*protmul[counter]*protnorm[nt-1]/(2.0*n*n); |
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323 | if( std::fabs(dum) < 1.0 ) |
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324 | { |
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325 | if( test >= 1.0e-10 )excs += dum*test; |
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326 | } |
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327 | else |
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328 | excs += dum*test; |
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329 | } |
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330 | } |
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331 | } |
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332 | } |
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333 | } |
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334 | if( ran >= excs ) // 3 previous loops continued to the end |
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335 | { |
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336 | quasiElastic = true; |
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337 | return; |
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338 | } |
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339 | np--; nm--; nz--; |
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340 | if( np == nm ) |
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341 | { |
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342 | if( G4UniformRand() >= 0.75 ) |
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343 | { |
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344 | currentParticle.SetDefinitionAndUpdateE( aKaonZL ); |
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345 | targetParticle.SetDefinitionAndUpdateE( aNeutron ); |
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346 | incidentHasChanged = true; |
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347 | targetHasChanged = true; |
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348 | } |
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349 | } |
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350 | else if( np == nm+1 ) |
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351 | { |
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352 | targetParticle.SetDefinitionAndUpdateE( aNeutron ); |
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353 | targetHasChanged = true; |
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354 | } |
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355 | else |
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356 | { |
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357 | currentParticle.SetDefinitionAndUpdateE( aKaonZL ); |
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358 | incidentHasChanged = true; |
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359 | } |
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360 | } |
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361 | else // target must be a neutron |
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362 | { |
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363 | G4int counter = -1; |
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364 | for( np=0; np<numSec/3 && ran>=excs; ++np ) |
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365 | { |
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366 | for( nm=np; nm<=(np+2) && ran>=excs; ++nm ) |
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367 | { |
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368 | for( nz=0; nz<numSec/3 && ran>=excs; ++nz ) |
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369 | { |
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370 | if( ++counter < numMul ) |
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371 | { |
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372 | nt = np+nm+nz; |
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373 | if( (nt>=1) && (nt<=numSec) ) |
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374 | { |
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375 | test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) ); |
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376 | dum = (pi/anpn)*nt*neutmul[counter]*neutnorm[nt-1]/(2.0*n*n); |
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377 | if( std::fabs(dum) < 1.0 ) |
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378 | { |
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379 | if( test >= 1.0e-10 )excs += dum*test; |
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380 | } |
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381 | else |
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382 | excs += dum*test; |
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383 | } |
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384 | } |
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385 | } |
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386 | } |
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387 | } |
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388 | if( ran >= excs ) // 3 previous loops continued to the end |
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389 | { |
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390 | quasiElastic = true; |
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391 | return; |
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392 | } |
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393 | np--; nm--; nz--; |
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394 | if( np == nm-1 ) |
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395 | { |
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396 | if( G4UniformRand() < 0.5 ) |
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397 | { |
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398 | targetParticle.SetDefinitionAndUpdateE( aProton ); |
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399 | targetHasChanged = true; |
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400 | } |
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401 | else |
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402 | { |
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403 | currentParticle.SetDefinitionAndUpdateE( aKaonZL ); |
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404 | incidentHasChanged = true; |
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405 | } |
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406 | } |
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407 | else if( np != nm ) |
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408 | { |
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409 | currentParticle.SetDefinitionAndUpdateE( aKaonZL ); |
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410 | incidentHasChanged = true; |
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411 | } |
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412 | } |
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413 | if( G4UniformRand() >= 0.5 ) |
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414 | { |
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415 | if( (currentParticle.GetDefinition() == aKaonMinus && |
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416 | targetParticle.GetDefinition() == aNeutron ) || |
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417 | (currentParticle.GetDefinition() == aKaonZL && |
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418 | targetParticle.GetDefinition() == aProton ) ) |
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419 | { |
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420 | ran = G4UniformRand(); |
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421 | if( ran < 0.68 ) |
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422 | { |
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423 | if( targetParticle.GetDefinition() == aProton ) |
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424 | { |
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425 | currentParticle.SetDefinitionAndUpdateE( aPiPlus ); |
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426 | targetParticle.SetDefinitionAndUpdateE( aLambda ); |
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427 | incidentHasChanged = true; |
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428 | targetHasChanged = true; |
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429 | } |
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430 | else |
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431 | { |
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432 | currentParticle.SetDefinitionAndUpdateE( aPiMinus ); |
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433 | targetParticle.SetDefinitionAndUpdateE( aLambda ); |
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434 | incidentHasChanged = true; |
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435 | targetHasChanged = true; |
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436 | } |
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437 | } |
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438 | else if( ran < 0.84 ) |
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439 | { |
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440 | if( targetParticle.GetDefinition() == aProton ) |
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441 | { |
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442 | currentParticle.SetDefinitionAndUpdateE( aPiZero ); |
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443 | targetParticle.SetDefinitionAndUpdateE( aSigmaPlus ); |
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444 | incidentHasChanged = true; |
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445 | targetHasChanged = true; |
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446 | } |
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447 | else |
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448 | { |
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449 | currentParticle.SetDefinitionAndUpdateE( aPiMinus ); |
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450 | targetParticle.SetDefinitionAndUpdateE( aSigmaZero ); |
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451 | incidentHasChanged = true; |
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452 | targetHasChanged = true; |
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453 | } |
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454 | } |
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455 | else |
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456 | { |
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457 | if( targetParticle.GetDefinition() == aProton ) |
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458 | { |
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459 | currentParticle.SetDefinitionAndUpdateE( aPiPlus ); |
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460 | targetParticle.SetDefinitionAndUpdateE( aSigmaZero ); |
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461 | incidentHasChanged = true; |
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462 | targetHasChanged = true; |
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463 | } |
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464 | else |
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465 | { |
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466 | currentParticle.SetDefinitionAndUpdateE( aPiZero ); |
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467 | targetParticle.SetDefinitionAndUpdateE( aSigmaMinus ); |
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468 | incidentHasChanged = true; |
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469 | targetHasChanged = true; |
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470 | } |
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471 | } |
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472 | } |
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473 | else // ( current != aKaonMinus || target != aNeutron ) && |
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474 | // ( current != aKaonZL || target != aProton ) |
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475 | { |
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476 | ran = G4UniformRand(); |
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477 | if( ran < 0.67 ) |
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478 | { |
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479 | currentParticle.SetDefinitionAndUpdateE( aPiZero ); |
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480 | targetParticle.SetDefinitionAndUpdateE( aLambda ); |
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481 | incidentHasChanged = true; |
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482 | targetHasChanged = true; |
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483 | } |
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484 | else if( ran < 0.78 ) |
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485 | { |
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486 | currentParticle.SetDefinitionAndUpdateE( aPiMinus ); |
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487 | targetParticle.SetDefinitionAndUpdateE( aSigmaPlus ); |
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488 | incidentHasChanged = true; |
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489 | targetHasChanged = true; |
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490 | } |
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491 | else if( ran < 0.89 ) |
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492 | { |
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493 | currentParticle.SetDefinitionAndUpdateE( aPiZero ); |
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494 | targetParticle.SetDefinitionAndUpdateE( aSigmaZero ); |
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495 | incidentHasChanged = true; |
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496 | targetHasChanged = true; |
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497 | } |
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498 | else |
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499 | { |
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500 | currentParticle.SetDefinitionAndUpdateE( aPiPlus ); |
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501 | targetParticle.SetDefinitionAndUpdateE( aSigmaMinus ); |
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502 | incidentHasChanged = true; |
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503 | targetHasChanged = true; |
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504 | } |
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505 | } |
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506 | } |
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507 | } |
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508 | if( currentParticle.GetDefinition() == aKaonZL ) |
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509 | { |
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510 | if( G4UniformRand() >= 0.5 ) |
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511 | { |
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512 | currentParticle.SetDefinitionAndUpdateE( aKaonZS ); |
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513 | incidentHasChanged = true; |
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514 | } |
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515 | } |
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516 | if( targetParticle.GetDefinition() == aKaonZL ) |
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517 | { |
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518 | if( G4UniformRand() >= 0.5 ) |
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519 | { |
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520 | targetParticle.SetDefinitionAndUpdateE( aKaonZS ); |
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521 | targetHasChanged = true; |
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522 | } |
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523 | } |
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524 | SetUpPions( np, nm, nz, vec, vecLen ); |
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525 | return; |
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526 | } |
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527 | |
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528 | /* end of file */ |
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529 | |
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530 | |
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531 | |
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