1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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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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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: G4RPGInelastic.cc,v 1.2 2007/08/15 20:38:25 dennis Exp $ |
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27 | // GEANT4 tag $Name: geant4-09-01-patch-02 $ |
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28 | // |
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29 | |
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30 | #include "G4RPGInelastic.hh" |
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31 | #include "Randomize.hh" |
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32 | #include "G4HadReentrentException.hh" |
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33 | #include "G4RPGStrangeProduction.hh" |
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34 | #include "G4RPGTwoBody.hh" |
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35 | |
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36 | |
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37 | G4double G4RPGInelastic::Pmltpc(G4int np, G4int nm, G4int nz, |
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38 | G4int n, G4double b, G4double c) |
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39 | { |
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40 | const G4double expxu = 82.; // upper bound for arg. of exp |
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41 | const G4double expxl = -expxu; // lower bound for arg. of exp |
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42 | G4double npf = 0.0; |
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43 | G4double nmf = 0.0; |
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44 | G4double nzf = 0.0; |
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45 | G4int i; |
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46 | for( i=2; i<=np; i++ )npf += std::log((double)i); |
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47 | for( i=2; i<=nm; i++ )nmf += std::log((double)i); |
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48 | for( i=2; i<=nz; i++ )nzf += std::log((double)i); |
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49 | G4double r; |
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50 | r = std::min( expxu, std::max( expxl, -(np-nm+nz+b)*(np-nm+nz+b)/(2*c*c*n*n)-npf-nmf-nzf ) ); |
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51 | return std::exp(r); |
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52 | } |
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53 | |
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54 | |
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55 | G4int G4RPGInelastic::Factorial( G4int n ) |
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56 | { |
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57 | G4int m = std::min(n,10); |
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58 | G4int result = 1; |
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59 | if( m <= 1 )return result; |
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60 | for( G4int i=2; i<=m; ++i )result *= i; |
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61 | return result; |
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62 | } |
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63 | |
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64 | |
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65 | G4bool G4RPGInelastic::MarkLeadingStrangeParticle( |
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66 | const G4ReactionProduct ¤tParticle, |
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67 | const G4ReactionProduct &targetParticle, |
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68 | G4ReactionProduct &leadParticle ) |
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69 | { |
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70 | // The following was in GenerateXandPt and TwoCluster. |
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71 | // Add a parameter to the GenerateXandPt function telling it about the |
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72 | // strange particle. |
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73 | // |
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74 | // Assumes that the original particle was a strange particle |
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75 | // |
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76 | G4bool lead = false; |
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77 | if( (currentParticle.GetMass() >= G4KaonPlus::KaonPlus()->GetPDGMass()) && |
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78 | (currentParticle.GetDefinition() != G4Proton::Proton()) && |
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79 | (currentParticle.GetDefinition() != G4Neutron::Neutron()) ) |
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80 | { |
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81 | lead = true; |
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82 | leadParticle = currentParticle; // set lead to the incident particle |
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83 | } |
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84 | else if( (targetParticle.GetMass() >= G4KaonPlus::KaonPlus()->GetPDGMass()) && |
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85 | (targetParticle.GetDefinition() != G4Proton::Proton()) && |
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86 | (targetParticle.GetDefinition() != G4Neutron::Neutron()) ) |
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87 | { |
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88 | lead = true; |
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89 | leadParticle = targetParticle; // set lead to the target particle |
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90 | } |
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91 | return lead; |
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92 | } |
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93 | |
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94 | |
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95 | void G4RPGInelastic::SetUpPions(const G4int np, const G4int nm, |
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96 | const G4int nz, |
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97 | G4FastVector<G4ReactionProduct,256> &vec, |
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98 | G4int &vecLen) |
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99 | { |
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100 | if( np+nm+nz == 0 )return; |
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101 | G4int i; |
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102 | G4ReactionProduct *p; |
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103 | for( i=0; i<np; ++i ) |
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104 | { |
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105 | p = new G4ReactionProduct; |
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106 | p->SetDefinition( G4PionPlus::PionPlus() ); |
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107 | (G4UniformRand() < 0.5) ? p->SetSide( -1 ) : p->SetSide( 1 ); |
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108 | vec.SetElement( vecLen++, p ); |
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109 | } |
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110 | for( i=np; i<np+nm; ++i ) |
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111 | { |
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112 | p = new G4ReactionProduct; |
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113 | p->SetDefinition( G4PionMinus::PionMinus() ); |
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114 | (G4UniformRand() < 0.5) ? p->SetSide( -1 ) : p->SetSide( 1 ); |
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115 | vec.SetElement( vecLen++, p ); |
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116 | } |
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117 | for( i=np+nm; i<np+nm+nz; ++i ) |
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118 | { |
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119 | p = new G4ReactionProduct; |
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120 | p->SetDefinition( G4PionZero::PionZero() ); |
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121 | (G4UniformRand() < 0.5) ? p->SetSide( -1 ) : p->SetSide( 1 ); |
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122 | vec.SetElement( vecLen++, p ); |
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123 | } |
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124 | } |
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125 | |
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126 | |
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127 | void G4RPGInelastic::GetNormalizationConstant( |
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128 | const G4double energy, // MeV, <0 means annihilation channels |
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129 | G4double &n, |
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130 | G4double &anpn ) |
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131 | { |
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132 | const G4double expxu = 82.; // upper bound for arg. of exp |
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133 | const G4double expxl = -expxu; // lower bound for arg. of exp |
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134 | const G4int numSec = 60; |
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135 | // |
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136 | // the only difference between the calculation for annihilation channels |
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137 | // and normal is the starting value, iBegin, for the loop below |
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138 | // |
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139 | G4int iBegin = 1; |
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140 | G4double en = energy; |
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141 | if( energy < 0.0 ) |
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142 | { |
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143 | iBegin = 2; |
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144 | en *= -1.0; |
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145 | } |
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146 | // |
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147 | // number of total particles vs. centre of mass Energy - 2*proton mass |
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148 | // |
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149 | G4double aleab = std::log(en/GeV); |
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150 | n = 3.62567 + aleab*(0.665843 + aleab*(0.336514 + aleab*(0.117712 + 0.0136912*aleab))); |
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151 | n -= 2.0; |
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152 | // |
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153 | // normalization constant for kno-distribution |
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154 | // |
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155 | anpn = 0.0; |
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156 | G4double test, temp; |
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157 | for( G4int i=iBegin; i<=numSec; ++i ) |
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158 | { |
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159 | temp = pi*i/(2.0*n*n); |
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160 | test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(i*i)/(n*n) ) ) ); |
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161 | if( temp < 1.0 ) |
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162 | { |
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163 | if( test >= 1.0e-10 )anpn += temp*test; |
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164 | } |
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165 | else |
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166 | anpn += temp*test; |
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167 | } |
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168 | } |
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169 | |
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170 | void G4RPGInelastic::CalculateMomenta( |
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171 | G4FastVector<G4ReactionProduct,256> &vec, |
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172 | G4int &vecLen, |
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173 | const G4HadProjectile *originalIncident, |
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174 | const G4DynamicParticle *originalTarget, |
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175 | G4ReactionProduct &modifiedOriginal, |
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176 | G4Nucleus &targetNucleus, |
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177 | G4ReactionProduct ¤tParticle, |
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178 | G4ReactionProduct &targetParticle, |
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179 | G4bool &incidentHasChanged, |
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180 | G4bool &targetHasChanged, |
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181 | G4bool quasiElastic ) |
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182 | { |
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183 | cache = 0; |
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184 | what = originalIncident->Get4Momentum().vect(); |
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185 | |
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186 | G4ReactionProduct leadingStrangeParticle; |
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187 | |
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188 | strangeProduction.ReactionStage(originalIncident, modifiedOriginal, |
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189 | incidentHasChanged, originalTarget, |
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190 | targetParticle, targetHasChanged, |
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191 | targetNucleus, currentParticle, |
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192 | vec, vecLen, |
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193 | false, leadingStrangeParticle); |
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194 | |
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195 | if( quasiElastic ) |
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196 | { |
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197 | twoBody.ReactionStage(originalIncident, modifiedOriginal, |
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198 | incidentHasChanged, originalTarget, |
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199 | targetParticle, targetHasChanged, |
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200 | targetNucleus, currentParticle, |
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201 | vec, vecLen, |
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202 | false, leadingStrangeParticle); |
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203 | return; |
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204 | } |
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205 | |
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206 | G4bool leadFlag = MarkLeadingStrangeParticle(currentParticle, |
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207 | targetParticle, |
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208 | leadingStrangeParticle ); |
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209 | // |
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210 | // Note: the number of secondaries can be reduced in GenerateXandPt |
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211 | // and TwoCluster |
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212 | // |
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213 | G4bool finishedGenXPt = false; |
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214 | G4bool annihilation = false; |
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215 | if( originalIncident->GetDefinition()->GetPDGEncoding() < 0 && |
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216 | currentParticle.GetMass() == 0.0 && targetParticle.GetMass() == 0.0 ) |
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217 | { |
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218 | // original was an anti-particle and annihilation has taken place |
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219 | annihilation = true; |
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220 | G4double ekcor = 1.0; |
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221 | G4double ek = originalIncident->GetKineticEnergy(); |
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222 | G4double ekOrg = ek; |
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223 | |
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224 | const G4double tarmas = originalTarget->GetDefinition()->GetPDGMass(); |
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225 | if( ek > 1.0*GeV )ekcor = 1./(ek/GeV); |
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226 | const G4double atomicWeight = targetNucleus.GetN(); |
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227 | ek = 2*tarmas + ek*(1.+ekcor/atomicWeight); |
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228 | G4double tkin = targetNucleus.Cinema(ek); |
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229 | ek += tkin; |
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230 | ekOrg += tkin; |
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231 | // modifiedOriginal.SetKineticEnergy( ekOrg ); |
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232 | // |
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233 | // evaporation -- re-calculate black track energies |
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234 | // this was Done already just before the cascade |
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235 | // |
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236 | tkin = targetNucleus.AnnihilationEvaporationEffects(ek, ekOrg); |
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237 | ekOrg -= tkin; |
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238 | ekOrg = std::max( 0.0001*GeV, ekOrg ); |
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239 | modifiedOriginal.SetKineticEnergy( ekOrg ); |
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240 | G4double amas = originalIncident->GetDefinition()->GetPDGMass(); |
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241 | G4double et = ekOrg + amas; |
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242 | G4double p = std::sqrt( std::abs(et*et-amas*amas) ); |
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243 | G4double pp = modifiedOriginal.GetMomentum().mag(); |
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244 | if( pp > 0.0 ) |
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245 | { |
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246 | G4ThreeVector momentum = modifiedOriginal.GetMomentum(); |
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247 | modifiedOriginal.SetMomentum( momentum * (p/pp) ); |
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248 | } |
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249 | if( ekOrg <= 0.0001 ) |
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250 | { |
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251 | modifiedOriginal.SetKineticEnergy( 0.0 ); |
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252 | modifiedOriginal.SetMomentum( 0.0, 0.0, 0.0 ); |
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253 | } |
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254 | } |
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255 | |
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256 | // twsup gives percentage of time two-cluster model is called |
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257 | |
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258 | const G4double twsup[] = { 1.0, 0.7, 0.5, 0.3, 0.2, 0.1 }; |
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259 | G4double rand1 = G4UniformRand(); |
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260 | G4double rand2 = G4UniformRand(); |
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261 | |
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262 | // Cache current, target, and secondaries |
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263 | G4ReactionProduct saveCurrent = currentParticle; |
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264 | G4ReactionProduct saveTarget = targetParticle; |
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265 | std::vector<G4ReactionProduct> savevec; |
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266 | for (G4int i = 0; i < vecLen; i++) savevec.push_back(*vec[i]); |
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267 | |
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268 | if( annihilation || (vecLen >= 6) || |
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269 | (modifiedOriginal.GetKineticEnergy()/GeV >= 1.0) && |
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270 | (((originalIncident->GetDefinition() == G4KaonPlus::KaonPlus() || |
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271 | originalIncident->GetDefinition() == G4KaonMinus::KaonMinus() || |
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272 | originalIncident->GetDefinition() == G4KaonZeroLong::KaonZeroLong() || |
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273 | originalIncident->GetDefinition() == G4KaonZeroShort::KaonZeroShort()) && |
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274 | rand1 < 0.5) || rand2 > twsup[vecLen]) ) |
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275 | |
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276 | finishedGenXPt = |
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277 | fragmentation.ReactionStage(originalIncident, modifiedOriginal, |
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278 | incidentHasChanged, originalTarget, |
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279 | targetParticle, targetHasChanged, |
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280 | targetNucleus, currentParticle, |
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281 | vec, vecLen, |
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282 | leadFlag, leadingStrangeParticle); |
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283 | |
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284 | if( finishedGenXPt ) |
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285 | { |
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286 | Rotate(vec, vecLen); |
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287 | return; |
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288 | } |
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289 | |
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290 | G4bool finishedTwoClu = false; |
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291 | if( modifiedOriginal.GetTotalMomentum()/MeV < 1.0 ) |
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292 | { |
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293 | for(G4int i=0; i<vecLen; i++) delete vec[i]; |
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294 | vecLen = 0; |
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295 | } |
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296 | else |
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297 | { |
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298 | // Occaisionally, GenerateXandPt will fail in the annihilation channel. |
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299 | // Restore current, target and secondaries to pre-GenerateXandPt state |
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300 | // before trying annihilation in TwoCluster |
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301 | |
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302 | if (!finishedGenXPt && annihilation) { |
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303 | currentParticle = saveCurrent; |
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304 | targetParticle = saveTarget; |
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305 | for (G4int i = 0; i < vecLen; i++) delete vec[i]; |
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306 | vecLen = 0; |
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307 | vec.Initialize( 0 ); |
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308 | for (G4int i = 0; i < G4int(savevec.size()); i++) { |
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309 | G4ReactionProduct* p = new G4ReactionProduct; |
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310 | *p = savevec[i]; |
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311 | vec.SetElement( vecLen++, p ); |
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312 | } |
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313 | } |
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314 | |
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315 | pionSuppression.ReactionStage(originalIncident, modifiedOriginal, |
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316 | incidentHasChanged, originalTarget, |
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317 | targetParticle, targetHasChanged, |
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318 | targetNucleus, currentParticle, |
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319 | vec, vecLen, |
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320 | false, leadingStrangeParticle); |
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321 | |
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322 | try |
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323 | { |
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324 | finishedTwoClu = |
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325 | twoCluster.ReactionStage(originalIncident, modifiedOriginal, |
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326 | incidentHasChanged, originalTarget, |
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327 | targetParticle, targetHasChanged, |
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328 | targetNucleus, currentParticle, |
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329 | vec, vecLen, |
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330 | leadFlag, leadingStrangeParticle); |
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331 | } |
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332 | catch(G4HadReentrentException aC) |
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333 | { |
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334 | aC.Report(G4cout); |
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335 | throw G4HadReentrentException(__FILE__, __LINE__, "Failing to calculate momenta"); |
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336 | } |
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337 | } |
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338 | |
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339 | if( finishedTwoClu ) |
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340 | { |
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341 | Rotate(vec, vecLen); |
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342 | return; |
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343 | } |
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344 | |
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345 | twoBody.ReactionStage(originalIncident, modifiedOriginal, |
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346 | incidentHasChanged, originalTarget, |
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347 | targetParticle, targetHasChanged, |
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348 | targetNucleus, currentParticle, |
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349 | vec, vecLen, |
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350 | false, leadingStrangeParticle); |
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351 | } |
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352 | |
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353 | |
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354 | void G4RPGInelastic:: |
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355 | Rotate(G4FastVector<G4ReactionProduct,256> &vec, G4int &vecLen) |
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356 | { |
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357 | G4double rotation = 2.*pi*G4UniformRand(); |
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358 | cache = rotation; |
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359 | G4int i; |
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360 | for( i=0; i<vecLen; ++i ) |
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361 | { |
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362 | G4ThreeVector momentum = vec[i]->GetMomentum(); |
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363 | momentum = momentum.rotate(rotation, what); |
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364 | vec[i]->SetMomentum(momentum); |
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365 | } |
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366 | } |
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367 | |
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368 | void |
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369 | G4RPGInelastic::SetUpChange(G4FastVector<G4ReactionProduct,256> &vec, |
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370 | G4int &vecLen, |
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371 | G4ReactionProduct ¤tParticle, |
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372 | G4ReactionProduct &targetParticle, |
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373 | G4bool &incidentHasChanged ) |
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374 | { |
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375 | theParticleChange.Clear(); |
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376 | G4ParticleDefinition *aKaonZL = G4KaonZeroLong::KaonZeroLong(); |
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377 | G4ParticleDefinition *aKaonZS = G4KaonZeroShort::KaonZeroShort(); |
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378 | G4int i; |
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379 | if( currentParticle.GetDefinition() == aKaonZL ) |
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380 | { |
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381 | if( G4UniformRand() <= 0.5 ) |
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382 | { |
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383 | currentParticle.SetDefinition( aKaonZS ); |
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384 | incidentHasChanged = true; |
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385 | } |
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386 | } |
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387 | else if( currentParticle.GetDefinition() == aKaonZS ) |
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388 | { |
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389 | if( G4UniformRand() > 0.5 ) |
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390 | { |
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391 | currentParticle.SetDefinition( aKaonZL ); |
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392 | incidentHasChanged = true; |
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393 | } |
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394 | } |
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395 | |
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396 | if( targetParticle.GetDefinition() == aKaonZL ) |
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397 | { |
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398 | if( G4UniformRand() <= 0.5 )targetParticle.SetDefinition( aKaonZS ); |
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399 | } |
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400 | else if( targetParticle.GetDefinition() == aKaonZS ) |
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401 | { |
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402 | if( G4UniformRand() > 0.5 )targetParticle.SetDefinition( aKaonZL ); |
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403 | } |
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404 | for( i=0; i<vecLen; ++i ) |
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405 | { |
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406 | if( vec[i]->GetDefinition() == aKaonZL ) |
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407 | { |
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408 | if( G4UniformRand() <= 0.5 )vec[i]->SetDefinition( aKaonZS ); |
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409 | } |
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410 | else if( vec[i]->GetDefinition() == aKaonZS ) |
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411 | { |
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412 | if( G4UniformRand() > 0.5 )vec[i]->SetDefinition( aKaonZL ); |
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413 | } |
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414 | } |
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415 | |
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416 | if( incidentHasChanged ) |
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417 | { |
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418 | G4DynamicParticle* p0 = new G4DynamicParticle; |
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419 | p0->SetDefinition( currentParticle.GetDefinition() ); |
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420 | p0->SetMomentum( currentParticle.GetMomentum() ); |
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421 | theParticleChange.AddSecondary( p0 ); |
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422 | theParticleChange.SetStatusChange( stopAndKill ); |
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423 | theParticleChange.SetEnergyChange( 0.0 ); |
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424 | } |
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425 | else |
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426 | { |
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427 | G4double p = currentParticle.GetMomentum().mag()/MeV; |
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428 | G4ThreeVector m = currentParticle.GetMomentum(); |
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429 | if( p > DBL_MIN ) |
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430 | theParticleChange.SetMomentumChange( m.x()/p, m.y()/p, m.z()/p ); |
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431 | else |
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432 | theParticleChange.SetMomentumChange( 0.0, 0.0, 1.0 ); |
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433 | |
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434 | G4double aE = currentParticle.GetKineticEnergy(); |
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435 | if (std::fabs(aE)<.1*eV) aE=.1*eV; |
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436 | theParticleChange.SetEnergyChange( aE ); |
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437 | } |
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438 | |
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439 | if( targetParticle.GetMass() > 0.0 ) // Tgt particle can be eliminated in TwoBody |
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440 | { |
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441 | G4ThreeVector momentum = targetParticle.GetMomentum(); |
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442 | momentum = momentum.rotate(cache, what); |
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443 | G4double targKE = targetParticle.GetKineticEnergy(); |
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444 | G4ThreeVector dir(0.0, 0.0, 1.0); |
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445 | if (targKE < DBL_MIN) |
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446 | targKE = DBL_MIN; |
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447 | else |
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448 | dir = momentum/momentum.mag(); |
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449 | |
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450 | G4DynamicParticle* p1 = |
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451 | new G4DynamicParticle(targetParticle.GetDefinition(), dir, targKE); |
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452 | |
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453 | theParticleChange.AddSecondary( p1 ); |
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454 | } |
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455 | |
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456 | G4DynamicParticle* p; |
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457 | for( i=0; i<vecLen; ++i ) |
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458 | { |
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459 | G4double secKE = vec[i]->GetKineticEnergy(); |
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460 | G4ThreeVector momentum = vec[i]->GetMomentum(); |
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461 | G4ThreeVector dir(0.0, 0.0, 1.0); |
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462 | if (secKE < DBL_MIN) |
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463 | secKE = DBL_MIN; |
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464 | else |
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465 | dir = momentum/momentum.mag(); |
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466 | |
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467 | p = new G4DynamicParticle(vec[i]->GetDefinition(), dir, secKE); |
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468 | theParticleChange.AddSecondary( p ); |
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469 | delete vec[i]; |
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470 | } |
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471 | } |
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472 | |
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473 | /* end of file */ |
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