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 | // 24.11.08 V. Grichine - first implementation |
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28 | // |
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29 | |
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30 | #include "G4GGNuclNuclCrossSection.hh" |
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31 | |
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32 | #include "G4ParticleTable.hh" |
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33 | #include "G4IonTable.hh" |
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34 | #include "G4ParticleDefinition.hh" |
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35 | |
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36 | |
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37 | |
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38 | //////////////////////////////////////////////////////////////////////////////// |
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39 | // |
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40 | // |
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41 | |
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42 | G4GGNuclNuclCrossSection::G4GGNuclNuclCrossSection() |
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43 | : fUpperLimit( 100000 * GeV ), |
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44 | fLowerLimit( 0.1 * GeV ), |
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45 | fRadiusConst( 1.08*fermi ) // 1.1, 1.3 ? |
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46 | { |
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47 | theProton = G4Proton::Proton(); |
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48 | theNeutron = G4Neutron::Neutron(); |
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49 | } |
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50 | |
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51 | /////////////////////////////////////////////////////////////////////////////////////// |
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52 | // |
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53 | // |
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54 | |
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55 | G4GGNuclNuclCrossSection::~G4GGNuclNuclCrossSection() |
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56 | { |
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57 | } |
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58 | |
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59 | |
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60 | //////////////////////////////////////////////////////////////////////////////////////// |
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61 | // |
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62 | // |
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63 | |
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64 | |
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65 | G4bool |
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66 | G4GGNuclNuclCrossSection::IsApplicable(const G4DynamicParticle* aDP, |
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67 | const G4Element* anElement) |
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68 | { |
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69 | return IsZAApplicable(aDP, anElement->GetZ(), anElement->GetN()); |
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70 | } |
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71 | |
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72 | //////////////////////////////////////////////////////////////////////////////////////// |
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73 | // |
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74 | // |
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75 | |
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76 | G4bool |
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77 | G4GGNuclNuclCrossSection::IsZAApplicable(const G4DynamicParticle* aDP, |
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78 | G4double Z, G4double) |
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79 | { |
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80 | G4bool applicable = false; |
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81 | // G4int baryonNumber = aDP->GetDefinition()->GetBaryonNumber(); |
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82 | G4double kineticEnergy = aDP->GetKineticEnergy(); |
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83 | |
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84 | // const G4ParticleDefinition* theParticle = aDP->GetDefinition(); |
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85 | |
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86 | if ( kineticEnergy >= fLowerLimit && Z > 1.5 ) applicable = true; |
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87 | |
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88 | return applicable; |
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89 | } |
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90 | |
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91 | //////////////////////////////////////////////////////////////////////////////////////// |
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92 | // |
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93 | // Calculates total and inelastic Xsc, derives elastic as total - inelastic accordong to |
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94 | // Glauber model with Gribov correction calculated in the dipole approximation on |
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95 | // light cone. Gaussian density helps to calculate rest integrals of the model. |
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96 | // [1] B.Z. Kopeliovich, nucl-th/0306044 |
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97 | |
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98 | |
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99 | G4double G4GGNuclNuclCrossSection:: |
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100 | GetCrossSection(const G4DynamicParticle* aParticle, const G4Element* anElement, G4double T) |
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101 | { |
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102 | return GetIsoZACrossSection(aParticle, anElement->GetZ(), anElement->GetN(), T); |
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103 | } |
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104 | |
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105 | //////////////////////////////////////////////////////////////////////////////////////// |
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106 | // |
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107 | // Calculates total and inelastic Xsc, derives elastic as total - inelastic accordong to |
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108 | // Glauber model with Gribov correction calculated in the dipole approximation on |
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109 | // light cone. Gaussian density of point-like nucleons helps to calculate rest integrals of the model. |
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110 | // [1] B.Z. Kopeliovich, nucl-th/0306044 + simplification above |
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111 | |
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112 | |
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113 | |
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114 | G4double G4GGNuclNuclCrossSection:: |
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115 | GetIsoZACrossSection(const G4DynamicParticle* aParticle, G4double tZ, G4double tA, G4double) |
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116 | { |
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117 | G4double xsection, sigma, cofInelastic = 2.4, cofTotal = 2.0, nucleusSquare, ratio; |
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118 | |
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119 | G4double pZ = aParticle->GetDefinition()->GetPDGCharge(); |
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120 | G4double pA = aParticle->GetDefinition()->GetBaryonNumber(); |
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121 | |
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122 | G4double pTkin = aParticle->GetKineticEnergy(); |
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123 | pTkin /= pA; |
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124 | |
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125 | G4double pN = pA - pZ; |
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126 | if( pN < 0. ) pN = 0.; |
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127 | |
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128 | G4double tN = tA - tZ; |
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129 | if( tN < 0. ) tN = 0.; |
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130 | |
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131 | G4double tR = GetNucleusRadius(tA); |
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132 | G4double pR = GetNucleusRadius(pA); |
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133 | |
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134 | sigma = (pZ*tZ+pN*tN)*GetHadronNucleonXscNS(theProton, pTkin, theProton) + |
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135 | (pZ*tN+pN*tZ)*GetHadronNucleonXscNS(theProton, pTkin, theNeutron); |
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136 | |
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137 | nucleusSquare = cofTotal*pi*( pR*pR + tR*tR ); // basically 2piRR |
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138 | |
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139 | ratio = sigma/nucleusSquare; |
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140 | |
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141 | xsection = nucleusSquare*std::log( 1. + ratio ); |
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142 | |
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143 | fTotalXsc = xsection; |
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144 | |
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145 | fInelasticXsc = nucleusSquare*std::log( 1. + cofInelastic*ratio )/cofInelastic; |
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146 | |
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147 | fElasticXsc = fTotalXsc - fInelasticXsc; |
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148 | |
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149 | G4double difratio = ratio/(1.+ratio); |
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150 | |
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151 | fDiffractionXsc = 0.5*nucleusSquare*( difratio - std::log( 1. + difratio ) ); |
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152 | |
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153 | // production to be checked !!! edit MK xsc |
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154 | |
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155 | sigma = (pZ*tZ+pN*tN)*GetHadronNucleonXscMK(theProton, pTkin, theProton) + |
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156 | (pZ*tN+pN*tZ)*GetHadronNucleonXscMK(theProton, pTkin, theNeutron); |
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157 | |
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158 | ratio = sigma/nucleusSquare; |
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159 | |
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160 | fProductionXsc = nucleusSquare*std::log( 1. + cofInelastic*ratio )/cofInelastic; |
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161 | |
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162 | if (fElasticXsc < 0.) fElasticXsc = 0.; |
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163 | |
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164 | return xsection; |
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165 | } |
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166 | |
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167 | ////////////////////////////////////////////////////////////////////////// |
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168 | // |
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169 | // Return single-diffraction/inelastic cross-section ratio |
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170 | |
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171 | G4double G4GGNuclNuclCrossSection:: |
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172 | GetRatioSD(const G4DynamicParticle* aParticle, G4double tA, G4double tZ) |
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173 | { |
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174 | G4double sigma, cofInelastic = 2.4, cofTotal = 2.0, nucleusSquare, ratio; |
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175 | |
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176 | G4double pZ = aParticle->GetDefinition()->GetPDGCharge(); |
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177 | G4double pA = aParticle->GetDefinition()->GetBaryonNumber(); |
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178 | |
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179 | G4double pTkin = aParticle->GetKineticEnergy(); |
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180 | pTkin /= pA; |
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181 | |
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182 | G4double pN = pA - pZ; |
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183 | if( pN < 0. ) pN = 0.; |
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184 | |
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185 | G4double tN = tA - tZ; |
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186 | if( tN < 0. ) tN = 0.; |
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187 | |
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188 | G4double tR = GetNucleusRadius(tA); |
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189 | G4double pR = GetNucleusRadius(pA); |
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190 | |
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191 | sigma = (pZ*tZ+pN*tN)*GetHadronNucleonXscNS(theProton, pTkin, theProton) + |
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192 | (pZ*tN+pN*tZ)*GetHadronNucleonXscNS(theProton, pTkin, theNeutron); |
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193 | |
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194 | nucleusSquare = cofTotal*pi*( pR*pR + tR*tR ); // basically 2piRR |
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195 | |
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196 | ratio = sigma/nucleusSquare; |
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197 | |
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198 | |
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199 | fInelasticXsc = nucleusSquare*std::log( 1. + cofInelastic*ratio )/cofInelastic; |
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200 | |
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201 | G4double difratio = ratio/(1.+ratio); |
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202 | |
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203 | fDiffractionXsc = 0.5*nucleusSquare*( difratio - std::log( 1. + difratio ) ); |
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204 | |
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205 | if (fInelasticXsc > 0.) ratio = fDiffractionXsc/fInelasticXsc; |
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206 | else ratio = 0.; |
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207 | |
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208 | return ratio; |
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209 | } |
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210 | |
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211 | ////////////////////////////////////////////////////////////////////////// |
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212 | // |
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213 | // Return suasi-elastic/inelastic cross-section ratio |
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214 | |
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215 | G4double G4GGNuclNuclCrossSection:: |
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216 | GetRatioQE(const G4DynamicParticle* aParticle, G4double tA, G4double tZ) |
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217 | { |
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218 | G4double sigma, cofInelastic = 2.4, cofTotal = 2.0, nucleusSquare, ratio; |
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219 | |
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220 | G4double pZ = aParticle->GetDefinition()->GetPDGCharge(); |
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221 | G4double pA = aParticle->GetDefinition()->GetBaryonNumber(); |
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222 | |
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223 | G4double pTkin = aParticle->GetKineticEnergy(); |
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224 | pTkin /= pA; |
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225 | |
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226 | G4double pN = pA - pZ; |
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227 | if( pN < 0. ) pN = 0.; |
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228 | |
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229 | G4double tN = tA - tZ; |
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230 | if( tN < 0. ) tN = 0.; |
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231 | |
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232 | G4double tR = GetNucleusRadius(tA); |
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233 | G4double pR = GetNucleusRadius(pA); |
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234 | |
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235 | sigma = (pZ*tZ+pN*tN)*GetHadronNucleonXscNS(theProton, pTkin, theProton) + |
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236 | (pZ*tN+pN*tZ)*GetHadronNucleonXscNS(theProton, pTkin, theNeutron); |
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237 | |
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238 | nucleusSquare = cofTotal*pi*( pR*pR + tR*tR ); // basically 2piRR |
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239 | |
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240 | ratio = sigma/nucleusSquare; |
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241 | |
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242 | fInelasticXsc = nucleusSquare*std::log( 1. + cofInelastic*ratio )/cofInelastic; |
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243 | |
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244 | // sigma = GetHNinelasticXsc(aParticle, tA, tZ); |
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245 | ratio = sigma/nucleusSquare; |
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246 | |
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247 | fProductionXsc = nucleusSquare*std::log( 1. + cofInelastic*ratio )/cofInelastic; |
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248 | |
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249 | if (fInelasticXsc > fProductionXsc) ratio = (fInelasticXsc-fProductionXsc)/fInelasticXsc; |
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250 | else ratio = 0.; |
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251 | if ( ratio < 0. ) ratio = 0.; |
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252 | |
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253 | return ratio; |
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254 | } |
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255 | |
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256 | ///////////////////////////////////////////////////////////////////////////////////// |
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257 | // |
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258 | // Returns hadron-nucleon Xsc according to differnt parametrisations: |
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259 | // [2] E. Levin, hep-ph/9710546 |
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260 | // [3] U. Dersch, et al, hep-ex/9910052 |
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261 | // [4] M.J. Longo, et al, Phys.Rev.Lett. 33 (1974) 725 |
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262 | |
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263 | G4double |
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264 | G4GGNuclNuclCrossSection::GetHadronNucleonXsc(const G4DynamicParticle* aParticle, |
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265 | const G4Element* anElement ) |
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266 | { |
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267 | G4double At = anElement->GetN(); // number of nucleons |
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268 | G4double Zt = anElement->GetZ(); // number of protons |
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269 | |
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270 | |
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271 | return GetHadronNucleonXsc( aParticle, At, Zt ); |
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272 | } |
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273 | |
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274 | |
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275 | |
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276 | |
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277 | ///////////////////////////////////////////////////////////////////////////////////// |
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278 | // |
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279 | // Returns hadron-nucleon Xsc according to differnt parametrisations: |
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280 | // [2] E. Levin, hep-ph/9710546 |
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281 | // [3] U. Dersch, et al, hep-ex/9910052 |
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282 | // [4] M.J. Longo, et al, Phys.Rev.Lett. 33 (1974) 725 |
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283 | |
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284 | G4double |
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285 | G4GGNuclNuclCrossSection::GetHadronNucleonXsc(const G4DynamicParticle* aParticle, |
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286 | G4double At, G4double Zt ) |
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287 | { |
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288 | G4double xsection = 0.; |
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289 | |
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290 | |
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291 | G4double targ_mass = G4ParticleTable::GetParticleTable()-> |
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292 | GetIonTable()->GetIonMass( G4int(Zt+0.5) , G4int(At+0.5) ); |
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293 | |
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294 | targ_mass = 0.939*GeV; // ~mean neutron and proton ??? |
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295 | |
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296 | G4double proj_mass = aParticle->GetMass(); |
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297 | G4double proj_momentum = aParticle->GetMomentum().mag(); |
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298 | G4double sMand = CalcMandelstamS ( proj_mass , targ_mass , proj_momentum ); |
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299 | |
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300 | sMand /= GeV*GeV; // in GeV for parametrisation |
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301 | proj_momentum /= GeV; |
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302 | |
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303 | const G4ParticleDefinition* pParticle = aParticle->GetDefinition(); |
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304 | |
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305 | |
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306 | if(pParticle == theNeutron) // as proton ??? |
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307 | { |
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308 | xsection = At*(21.70*std::pow(sMand,0.0808) + 56.08*std::pow(sMand,-0.4525)); |
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309 | } |
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310 | else if(pParticle == theProton) |
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311 | { |
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312 | xsection = At*(21.70*std::pow(sMand,0.0808) + 56.08*std::pow(sMand,-0.4525)); |
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313 | // xsection = At*( 49.51*std::pow(sMand,-0.097) + 0.314*std::log(sMand)*std::log(sMand) ); |
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314 | // xsection = At*( 38.4 + 0.85*std::abs(std::pow(log(sMand),1.47)) ); |
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315 | } |
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316 | |
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317 | xsection *= millibarn; |
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318 | return xsection; |
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319 | } |
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320 | |
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321 | |
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322 | ///////////////////////////////////////////////////////////////////////////////////// |
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323 | // |
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324 | // Returns hadron-nucleon Xsc according to PDG parametrisation (2005): |
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325 | // http://pdg.lbl.gov/2006/reviews/hadronicrpp.pdf |
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326 | |
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327 | G4double |
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328 | G4GGNuclNuclCrossSection::GetHadronNucleonXscPDG(const G4DynamicParticle* aParticle, |
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329 | const G4Element* anElement ) |
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330 | { |
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331 | G4double At = anElement->GetN(); // number of nucleons |
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332 | G4double Zt = anElement->GetZ(); // number of protons |
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333 | |
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334 | |
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335 | return GetHadronNucleonXscPDG( aParticle, At, Zt ); |
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336 | } |
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337 | |
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338 | |
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339 | |
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340 | |
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341 | ///////////////////////////////////////////////////////////////////////////////////// |
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342 | // |
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343 | // Returns hadron-nucleon Xsc according to PDG parametrisation (2005): |
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344 | // http://pdg.lbl.gov/2006/reviews/hadronicrpp.pdf |
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345 | // At = number of nucleons, Zt = number of protons |
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346 | |
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347 | G4double |
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348 | G4GGNuclNuclCrossSection::GetHadronNucleonXscPDG(const G4DynamicParticle* aParticle, |
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349 | G4double At, G4double Zt ) |
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350 | { |
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351 | G4double xsection = 0.; |
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352 | |
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353 | G4double Nt = At-Zt; // number of neutrons |
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354 | if (Nt < 0.) Nt = 0.; |
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355 | |
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356 | |
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357 | G4double targ_mass = G4ParticleTable::GetParticleTable()-> |
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358 | GetIonTable()->GetIonMass( G4int(Zt+0.5) , G4int(At+0.5) ); |
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359 | |
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360 | targ_mass = 0.939*GeV; // ~mean neutron and proton ??? |
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361 | |
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362 | G4double proj_mass = aParticle->GetMass(); |
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363 | G4double proj_momentum = aParticle->GetMomentum().mag(); |
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364 | |
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365 | G4double sMand = CalcMandelstamS ( proj_mass , targ_mass , proj_momentum ); |
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366 | |
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367 | sMand /= GeV*GeV; // in GeV for parametrisation |
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368 | |
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369 | // General PDG fit constants |
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370 | |
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371 | G4double s0 = 5.38*5.38; // in Gev^2 |
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372 | G4double eta1 = 0.458; |
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373 | G4double eta2 = 0.458; |
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374 | G4double B = 0.308; |
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375 | |
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376 | |
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377 | const G4ParticleDefinition* pParticle = aParticle->GetDefinition(); |
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378 | |
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379 | |
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380 | if(pParticle == theNeutron) // proton-neutron fit |
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381 | { |
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382 | xsection = Zt*( 35.80 + B*std::pow(std::log(sMand/s0),2.) |
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383 | + 40.15*std::pow(sMand,-eta1) - 30.*std::pow(sMand,-eta2)); |
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384 | xsection += Nt*( 35.45 + B*std::pow(std::log(sMand/s0),2.) |
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385 | + 42.53*std::pow(sMand,-eta1) - 33.34*std::pow(sMand,-eta2)); // pp for nn |
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386 | } |
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387 | else if(pParticle == theProton) |
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388 | { |
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389 | |
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390 | xsection = Zt*( 35.45 + B*std::pow(std::log(sMand/s0),2.) |
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391 | + 42.53*std::pow(sMand,-eta1) - 33.34*std::pow(sMand,-eta2)); |
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392 | |
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393 | xsection += Nt*( 35.80 + B*std::pow(std::log(sMand/s0),2.) |
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394 | + 40.15*std::pow(sMand,-eta1) - 30.*std::pow(sMand,-eta2)); |
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395 | } |
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396 | xsection *= millibarn; // parametrised in mb |
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397 | return xsection; |
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398 | } |
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399 | |
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400 | |
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401 | |
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402 | |
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403 | ///////////////////////////////////////////////////////////////////////////////////// |
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404 | // |
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405 | // Returns nucleon-nucleon cross-section based on N. Starkov parametrisation of |
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406 | // data from mainly http://wwwppds.ihep.su:8001/c5-6A.html database |
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407 | // projectile nucleon is pParticle with pTkin shooting target nucleon tParticle |
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408 | |
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409 | G4double |
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410 | G4GGNuclNuclCrossSection::GetHadronNucleonXscNS( G4ParticleDefinition* pParticle, |
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411 | G4double pTkin, |
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412 | G4ParticleDefinition* tParticle) |
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413 | { |
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414 | G4double xsection(0), Delta, A0, B0; |
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415 | G4double hpXsc(0); |
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416 | G4double hnXsc(0); |
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417 | |
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418 | |
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419 | G4double targ_mass = tParticle->GetPDGMass(); |
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420 | G4double proj_mass = pParticle->GetPDGMass(); |
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421 | |
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422 | G4double proj_energy = proj_mass + pTkin; |
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423 | G4double proj_momentum = std::sqrt(pTkin*(pTkin+2*proj_mass)); |
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424 | |
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425 | G4double sMand = CalcMandelstamS ( proj_mass , targ_mass , proj_momentum ); |
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426 | |
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427 | sMand /= GeV*GeV; // in GeV for parametrisation |
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428 | proj_momentum /= GeV; |
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429 | proj_energy /= GeV; |
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430 | proj_mass /= GeV; |
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431 | |
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432 | // General PDG fit constants |
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433 | |
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434 | // G4double s0 = 5.38*5.38; // in Gev^2 |
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435 | // G4double eta1 = 0.458; |
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436 | // G4double eta2 = 0.458; |
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437 | // G4double B = 0.308; |
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438 | |
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439 | |
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440 | |
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441 | |
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442 | |
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443 | if( proj_momentum >= 10. ) // high energy: pp = nn = np |
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444 | // if( proj_momentum >= 2.) |
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445 | { |
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446 | Delta = 1.; |
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447 | |
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448 | if( proj_energy < 40. ) Delta = 0.916+0.0021*proj_energy; |
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449 | |
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450 | if( proj_momentum >= 10.) |
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451 | { |
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452 | B0 = 7.5; |
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453 | A0 = 100. - B0*std::log(3.0e7); |
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454 | |
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455 | xsection = A0 + B0*std::log(proj_energy) - 11 |
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456 | + 103*std::pow(2*0.93827*proj_energy + proj_mass*proj_mass+ |
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457 | 0.93827*0.93827,-0.165); // mb |
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458 | } |
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459 | } |
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460 | else // low energy pp = nn != np |
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461 | { |
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462 | if(pParticle == tParticle) // pp or nn // nn to be pp |
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463 | { |
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464 | if( proj_momentum < 0.73 ) |
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465 | { |
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466 | hnXsc = 23 + 50*( std::pow( std::log(0.73/proj_momentum), 3.5 ) ); |
---|
467 | } |
---|
468 | else if( proj_momentum < 1.05 ) |
---|
469 | { |
---|
470 | hnXsc = 23 + 40*(std::log(proj_momentum/0.73))* |
---|
471 | (std::log(proj_momentum/0.73)); |
---|
472 | } |
---|
473 | else // if( proj_momentum < 10. ) |
---|
474 | { |
---|
475 | hnXsc = 39.0 + |
---|
476 | 75*(proj_momentum - 1.2)/(std::pow(proj_momentum,3.0) + 0.15); |
---|
477 | } |
---|
478 | xsection = hnXsc; |
---|
479 | } |
---|
480 | else // pn to be np |
---|
481 | { |
---|
482 | if( proj_momentum < 0.8 ) |
---|
483 | { |
---|
484 | hpXsc = 33+30*std::pow(std::log(proj_momentum/1.3),4.0); |
---|
485 | } |
---|
486 | else if( proj_momentum < 1.4 ) |
---|
487 | { |
---|
488 | hpXsc = 33+30*std::pow(std::log(proj_momentum/0.95),2.0); |
---|
489 | } |
---|
490 | else // if( proj_momentum < 10. ) |
---|
491 | { |
---|
492 | hpXsc = 33.3+ |
---|
493 | 20.8*(std::pow(proj_momentum,2.0)-1.35)/ |
---|
494 | (std::pow(proj_momentum,2.50)+0.95); |
---|
495 | } |
---|
496 | xsection = hpXsc; |
---|
497 | } |
---|
498 | } |
---|
499 | xsection *= millibarn; // parametrised in mb |
---|
500 | return xsection; |
---|
501 | } |
---|
502 | |
---|
503 | /* |
---|
504 | ///////////////////////////////////////////////////////////////////////////////////// |
---|
505 | // |
---|
506 | // Returns hadron-nucleon inelastic cross-section based on proper parametrisation |
---|
507 | |
---|
508 | G4double |
---|
509 | G4GGNuclNuclCrossSection::GetHNinelasticXsc(const G4DynamicParticle* aParticle, |
---|
510 | const G4Element* anElement ) |
---|
511 | { |
---|
512 | G4double At = anElement->GetN(); // number of nucleons |
---|
513 | G4double Zt = anElement->GetZ(); // number of protons |
---|
514 | |
---|
515 | |
---|
516 | return GetHNinelasticXsc( aParticle, At, Zt ); |
---|
517 | } |
---|
518 | |
---|
519 | ///////////////////////////////////////////////////////////////////////////////////// |
---|
520 | // |
---|
521 | // Returns hadron-nucleon inelastic cross-section based on FTF-parametrisation |
---|
522 | |
---|
523 | G4double |
---|
524 | G4GGNuclNuclCrossSection::GetHNinelasticXsc(const G4DynamicParticle* aParticle, |
---|
525 | G4double At, G4double Zt ) |
---|
526 | { |
---|
527 | // G4ParticleDefinition* hadron = aParticle->GetDefinition(); |
---|
528 | G4double sumInelastic, Nt = At - Zt; |
---|
529 | |
---|
530 | if(Nt < 0.) Nt = 0.; |
---|
531 | |
---|
532 | sumInelastic = Zt*GetHadronNucleonXscMK(aParticle, theProton); |
---|
533 | sumInelastic += Nt*GetHadronNucleonXscMK(aParticle, theNeutron); |
---|
534 | |
---|
535 | return sumInelastic; |
---|
536 | } |
---|
537 | */ |
---|
538 | |
---|
539 | ///////////////////////////////////////////////////////////////////////////////////// |
---|
540 | // |
---|
541 | // Returns hadron-nucleon inelastic cross-section based on FTF-parametrisation |
---|
542 | |
---|
543 | G4double |
---|
544 | G4GGNuclNuclCrossSection::GetHNinelasticXscVU(const G4DynamicParticle* aParticle, |
---|
545 | G4double At, G4double Zt ) |
---|
546 | { |
---|
547 | G4int PDGcode = aParticle->GetDefinition()->GetPDGEncoding(); |
---|
548 | G4int absPDGcode = std::abs(PDGcode); |
---|
549 | |
---|
550 | G4double Elab = aParticle->GetTotalEnergy(); |
---|
551 | // (s - 2*0.88*GeV*GeV)/(2*0.939*GeV)/GeV; |
---|
552 | G4double Plab = aParticle->GetMomentum().mag(); |
---|
553 | // std::sqrt(Elab * Elab - 0.88); |
---|
554 | |
---|
555 | Elab /= GeV; |
---|
556 | Plab /= GeV; |
---|
557 | |
---|
558 | G4double LogPlab = std::log( Plab ); |
---|
559 | G4double sqrLogPlab = LogPlab * LogPlab; |
---|
560 | |
---|
561 | //G4cout<<"Plab = "<<Plab<<G4endl; |
---|
562 | |
---|
563 | G4double NumberOfTargetProtons = Zt; |
---|
564 | G4double NumberOfTargetNucleons = At; |
---|
565 | G4double NumberOfTargetNeutrons = NumberOfTargetNucleons - NumberOfTargetProtons; |
---|
566 | |
---|
567 | if(NumberOfTargetNeutrons < 0.) NumberOfTargetNeutrons = 0.; |
---|
568 | |
---|
569 | G4double Xtotal = 0., Xelastic = 0., Xinelastic =0.; |
---|
570 | |
---|
571 | if( absPDGcode > 1000 ) //------Projectile is baryon -------- |
---|
572 | { |
---|
573 | G4double XtotPP = 48.0 + 0. *std::pow(Plab, 0. ) + |
---|
574 | 0.522*sqrLogPlab - 4.51*LogPlab; |
---|
575 | |
---|
576 | G4double XtotPN = 47.3 + 0. *std::pow(Plab, 0. ) + |
---|
577 | 0.513*sqrLogPlab - 4.27*LogPlab; |
---|
578 | |
---|
579 | G4double XelPP = 11.9 + 26.9*std::pow(Plab,-1.21) + |
---|
580 | 0.169*sqrLogPlab - 1.85*LogPlab; |
---|
581 | |
---|
582 | G4double XelPN = 11.9 + 26.9*std::pow(Plab,-1.21) + |
---|
583 | 0.169*sqrLogPlab - 1.85*LogPlab; |
---|
584 | |
---|
585 | Xtotal = ( NumberOfTargetProtons * XtotPP + |
---|
586 | NumberOfTargetNeutrons * XtotPN ); |
---|
587 | |
---|
588 | Xelastic = ( NumberOfTargetProtons * XelPP + |
---|
589 | NumberOfTargetNeutrons * XelPN ); |
---|
590 | } |
---|
591 | Xinelastic = Xtotal - Xelastic; |
---|
592 | |
---|
593 | if(Xinelastic < 0.) Xinelastic = 0.; |
---|
594 | |
---|
595 | return Xinelastic*= millibarn; |
---|
596 | } |
---|
597 | |
---|
598 | ///////////////////////////////////////////////////////////////////////////////////// |
---|
599 | // |
---|
600 | // Returns hadron-nucleon cross-section based on Mikhail Kossov CHIPS parametrisation of |
---|
601 | // data from G4QuasiFreeRatios class |
---|
602 | |
---|
603 | G4double |
---|
604 | G4GGNuclNuclCrossSection::GetHadronNucleonXscMK(G4ParticleDefinition* pParticle, G4double pTkin, |
---|
605 | G4ParticleDefinition* nucleon ) |
---|
606 | { |
---|
607 | G4int I = -1; |
---|
608 | G4int PDG = pParticle->GetPDGEncoding(); |
---|
609 | G4double totalXsc = 0; |
---|
610 | G4double elasticXsc = 0; |
---|
611 | G4double inelasticXsc; |
---|
612 | // G4int absPDG = std::abs(PDG); |
---|
613 | |
---|
614 | G4double pM = pParticle->GetPDGMass(); |
---|
615 | G4double p = std::sqrt(pTkin*(pTkin+2*pM))/GeV; |
---|
616 | |
---|
617 | G4bool F = false; |
---|
618 | if(nucleon == theProton) F = true; |
---|
619 | else if(nucleon == theNeutron) F = false; |
---|
620 | else |
---|
621 | { |
---|
622 | G4cout << "nucleon is not proton or neutron, return xsc for proton" << G4endl; |
---|
623 | F = true; |
---|
624 | } |
---|
625 | |
---|
626 | G4bool kfl = true; // Flag of K0/aK0 oscillation |
---|
627 | G4bool kf = false; |
---|
628 | |
---|
629 | if( PDG == 130 || PDG == 310 ) |
---|
630 | { |
---|
631 | kf = true; |
---|
632 | if( G4UniformRand() > .5 ) kfl = false; |
---|
633 | } |
---|
634 | if ( (PDG == 2212 && F) || (PDG == 2112 && !F) ) I = 0; // pp/nn |
---|
635 | else if( (PDG == 2112 && F) || (PDG == 2212 && !F) ) I = 1; // np/pn |
---|
636 | else |
---|
637 | { |
---|
638 | G4cout<<"MK PDG = "<<PDG |
---|
639 | <<", while it is defined only for p,n,hyperons,anti-baryons,pi,K/antiK"<<G4endl; |
---|
640 | G4Exception("G4QuasiFreeRatio::FetchElTot:","22",FatalException,"CHIPScrash"); |
---|
641 | } |
---|
642 | |
---|
643 | // Each parameter set can have not more than nPoints = 128 parameters |
---|
644 | |
---|
645 | static const G4double lmi = 3.5; // min of (lnP-lmi)^2 parabola |
---|
646 | static const G4double pbe = .0557; // elastic (lnP-lmi)^2 parabola coefficient |
---|
647 | static const G4double pbt = .3; // total (lnP-lmi)^2 parabola coefficient |
---|
648 | static const G4double pmi = .1; // Below that fast LE calculation is made |
---|
649 | static const G4double pma = 1000.; // Above that fast HE calculation is made |
---|
650 | |
---|
651 | if( p <= 0.) |
---|
652 | { |
---|
653 | G4cout<<" p = "<<p<<" is zero or negative"<<G4endl; |
---|
654 | |
---|
655 | elasticXsc = 0.; |
---|
656 | inelasticXsc = 0.; |
---|
657 | totalXsc = 0.; |
---|
658 | |
---|
659 | return totalXsc; |
---|
660 | } |
---|
661 | if (!I) // pp/nn |
---|
662 | { |
---|
663 | if( p < pmi ) |
---|
664 | { |
---|
665 | G4double p2 = p*p; |
---|
666 | elasticXsc = 1./(.00012 + p2*.2); |
---|
667 | totalXsc = elasticXsc; |
---|
668 | } |
---|
669 | else if(p>pma) |
---|
670 | { |
---|
671 | G4double lp = std::log(p)-lmi; |
---|
672 | G4double lp2 = lp*lp; |
---|
673 | elasticXsc = pbe*lp2 + 6.72; |
---|
674 | totalXsc = pbt*lp2 + 38.2; |
---|
675 | } |
---|
676 | else |
---|
677 | { |
---|
678 | G4double p2 = p*p; |
---|
679 | G4double LE = 1./( .00012 + p2*.2); |
---|
680 | G4double lp = std::log(p) - lmi; |
---|
681 | G4double lp2 = lp*lp; |
---|
682 | G4double rp2 = 1./p2; |
---|
683 | elasticXsc = LE + ( pbe*lp2 + 6.72+32.6/p)/( 1. + rp2/p); |
---|
684 | totalXsc = LE + ( pbt*lp2 + 38.2+52.7*rp2)/( 1. + 2.72*rp2*rp2); |
---|
685 | } |
---|
686 | } |
---|
687 | else if( I==1 ) // np/pn |
---|
688 | { |
---|
689 | if( p < pmi ) |
---|
690 | { |
---|
691 | G4double p2 = p*p; |
---|
692 | elasticXsc = 1./( .00012 + p2*( .051 + .1*p2)); |
---|
693 | totalXsc = elasticXsc; |
---|
694 | } |
---|
695 | else if( p > pma ) |
---|
696 | { |
---|
697 | G4double lp = std::log(p) - lmi; |
---|
698 | G4double lp2 = lp*lp; |
---|
699 | elasticXsc = pbe*lp2 + 6.72; |
---|
700 | totalXsc = pbt*lp2 + 38.2; |
---|
701 | } |
---|
702 | else |
---|
703 | { |
---|
704 | G4double p2 = p*p; |
---|
705 | G4double LE = 1./( .00012 + p2*( .051 + .1*p2 ) ); |
---|
706 | G4double lp = std::log(p) - lmi; |
---|
707 | G4double lp2 = lp*lp; |
---|
708 | G4double rp2 = 1./p2; |
---|
709 | elasticXsc = LE + (pbe*lp2 + 6.72 + 30./p)/( 1. + .49*rp2/p); |
---|
710 | totalXsc = LE + (pbt*lp2 + 38.2)/( 1. + .54*rp2*rp2); |
---|
711 | } |
---|
712 | } |
---|
713 | else |
---|
714 | { |
---|
715 | G4cout<<"PDG incoding = "<<I<<" is not defined (0-1)"<<G4endl; |
---|
716 | |
---|
717 | } |
---|
718 | if( elasticXsc > totalXsc ) elasticXsc = totalXsc; |
---|
719 | |
---|
720 | totalXsc *= millibarn; |
---|
721 | elasticXsc *= millibarn; |
---|
722 | inelasticXsc = totalXsc - elasticXsc; |
---|
723 | if (inelasticXsc < 0.) inelasticXsc = 0.; |
---|
724 | |
---|
725 | return inelasticXsc; |
---|
726 | } |
---|
727 | |
---|
728 | //////////////////////////////////////////////////////////////////////////////////// |
---|
729 | // |
---|
730 | // |
---|
731 | |
---|
732 | G4double |
---|
733 | G4GGNuclNuclCrossSection::GetNucleusRadius( const G4DynamicParticle* , |
---|
734 | const G4Element* anElement) |
---|
735 | { |
---|
736 | G4double At = anElement->GetN(); |
---|
737 | G4double oneThird = 1.0/3.0; |
---|
738 | G4double cubicrAt = std::pow (At, oneThird); |
---|
739 | |
---|
740 | |
---|
741 | G4double R; // = fRadiusConst*cubicrAt; |
---|
742 | /* |
---|
743 | G4double tmp = std::pow( cubicrAt-1., 3.); |
---|
744 | tmp += At; |
---|
745 | tmp *= 0.5; |
---|
746 | |
---|
747 | if (At > 20.) // 20. |
---|
748 | { |
---|
749 | R = fRadiusConst*std::pow (tmp, oneThird); |
---|
750 | } |
---|
751 | else |
---|
752 | { |
---|
753 | R = fRadiusConst*cubicrAt; |
---|
754 | } |
---|
755 | */ |
---|
756 | |
---|
757 | R = fRadiusConst*cubicrAt; |
---|
758 | |
---|
759 | // return R; // !!!! |
---|
760 | |
---|
761 | |
---|
762 | |
---|
763 | G4double meanA = 21.; |
---|
764 | |
---|
765 | G4double tauA1 = 40.; |
---|
766 | G4double tauA2 = 10.; |
---|
767 | G4double tauA3 = 5.; |
---|
768 | |
---|
769 | G4double a1 = 0.85; |
---|
770 | G4double b1 = 1. - a1; |
---|
771 | |
---|
772 | G4double b2 = 0.3; |
---|
773 | G4double b3 = 4.; |
---|
774 | |
---|
775 | if (At > 20.) // 20. |
---|
776 | { |
---|
777 | R *= ( a1 + b1*std::exp( -(At - meanA)/tauA1) ); |
---|
778 | } |
---|
779 | else if (At > 3.5) |
---|
780 | { |
---|
781 | R *= ( 1.0 + b2*( 1. - std::exp( (At - meanA)/tauA2) ) ); |
---|
782 | } |
---|
783 | else |
---|
784 | { |
---|
785 | R *= ( 1.0 + b3*( 1. - std::exp( (At - meanA)/tauA3) ) ); |
---|
786 | } |
---|
787 | return R; |
---|
788 | |
---|
789 | } |
---|
790 | |
---|
791 | //////////////////////////////////////////////////////////////////////////////////// |
---|
792 | // |
---|
793 | // |
---|
794 | |
---|
795 | G4double |
---|
796 | G4GGNuclNuclCrossSection::GetNucleusRadius(G4double At) |
---|
797 | { |
---|
798 | G4double R; |
---|
799 | |
---|
800 | // R = GetNucleusRadiusGG(At); |
---|
801 | |
---|
802 | R = GetNucleusRadiusDE(At); |
---|
803 | |
---|
804 | return R; |
---|
805 | } |
---|
806 | |
---|
807 | /////////////////////////////////////////////////////////////////// |
---|
808 | |
---|
809 | G4double |
---|
810 | G4GGNuclNuclCrossSection::GetNucleusRadiusGG(G4double At) |
---|
811 | { |
---|
812 | |
---|
813 | G4double oneThird = 1.0/3.0; |
---|
814 | G4double cubicrAt = std::pow (At, oneThird); |
---|
815 | |
---|
816 | |
---|
817 | G4double R; // = fRadiusConst*cubicrAt; |
---|
818 | |
---|
819 | /* |
---|
820 | G4double tmp = std::pow( cubicrAt-1., 3.); |
---|
821 | tmp += At; |
---|
822 | tmp *= 0.5; |
---|
823 | |
---|
824 | if (At > 20.) |
---|
825 | { |
---|
826 | R = fRadiusConst*std::pow (tmp, oneThird); |
---|
827 | } |
---|
828 | else |
---|
829 | { |
---|
830 | R = fRadiusConst*cubicrAt; |
---|
831 | } |
---|
832 | */ |
---|
833 | |
---|
834 | R = fRadiusConst*cubicrAt; |
---|
835 | |
---|
836 | G4double meanA = 20.; |
---|
837 | G4double tauA = 20.; |
---|
838 | |
---|
839 | if ( At > 20.) // 20. |
---|
840 | { |
---|
841 | R *= ( 0.8 + 0.2*std::exp( -(At - meanA)/tauA) ); |
---|
842 | } |
---|
843 | else |
---|
844 | { |
---|
845 | R *= ( 1.0 + 0.1*( 1. - std::exp( (At - meanA)/tauA) ) ); |
---|
846 | } |
---|
847 | |
---|
848 | return R; |
---|
849 | |
---|
850 | } |
---|
851 | |
---|
852 | |
---|
853 | G4double |
---|
854 | G4GGNuclNuclCrossSection::GetNucleusRadiusDE(G4double A) |
---|
855 | { |
---|
856 | |
---|
857 | // algorithm from diffuse-elastic |
---|
858 | |
---|
859 | G4double R, r0, a11, a12, a13, a2, a3; |
---|
860 | |
---|
861 | a11 = 1.26; // 1.08, 1.16 |
---|
862 | a12 = 1.; // 1.08, 1.16 |
---|
863 | a13 = 1.12; // 1.08, 1.16 |
---|
864 | a2 = 1.1; |
---|
865 | a3 = 1.; |
---|
866 | |
---|
867 | |
---|
868 | if( A < 50. ) |
---|
869 | { |
---|
870 | if( 10 < A && A <= 15. ) r0 = a11*( 1 - std::pow(A, -2./3.) )*fermi; // 1.08*fermi; |
---|
871 | else if( 15 < A && A <= 20 ) r0 = a12*( 1 - std::pow(A, -2./3.) )*fermi; |
---|
872 | else if( 20 < A && A <= 30 ) r0 = a13*( 1 - std::pow(A, -2./3.) )*fermi; |
---|
873 | else r0 = a2*fermi; |
---|
874 | |
---|
875 | R = r0*std::pow( A, 1./3. ); |
---|
876 | } |
---|
877 | else |
---|
878 | { |
---|
879 | r0 = a3*fermi; |
---|
880 | |
---|
881 | R = r0*std::pow(A, 0.27); |
---|
882 | } |
---|
883 | return R; |
---|
884 | |
---|
885 | |
---|
886 | |
---|
887 | } |
---|
888 | |
---|
889 | |
---|
890 | |
---|
891 | |
---|
892 | |
---|
893 | |
---|
894 | //////////////////////////////////////////////////////////////////////////////////// |
---|
895 | // |
---|
896 | // |
---|
897 | |
---|
898 | G4double G4GGNuclNuclCrossSection::CalculateEcmValue( const G4double mp , |
---|
899 | const G4double mt , |
---|
900 | const G4double Plab ) |
---|
901 | { |
---|
902 | G4double Elab = std::sqrt ( mp * mp + Plab * Plab ); |
---|
903 | G4double Ecm = std::sqrt ( mp * mp + mt * mt + 2 * Elab * mt ); |
---|
904 | // G4double Pcm = Plab * mt / Ecm; |
---|
905 | // G4double KEcm = std::sqrt ( Pcm * Pcm + mp * mp ) - mp; |
---|
906 | |
---|
907 | return Ecm ; // KEcm; |
---|
908 | } |
---|
909 | |
---|
910 | |
---|
911 | //////////////////////////////////////////////////////////////////////////////////// |
---|
912 | // |
---|
913 | // |
---|
914 | |
---|
915 | G4double G4GGNuclNuclCrossSection::CalcMandelstamS( const G4double mp , |
---|
916 | const G4double mt , |
---|
917 | const G4double Plab ) |
---|
918 | { |
---|
919 | G4double Elab = std::sqrt ( mp * mp + Plab * Plab ); |
---|
920 | G4double sMand = mp*mp + mt*mt + 2*Elab*mt ; |
---|
921 | |
---|
922 | return sMand; |
---|
923 | } |
---|
924 | |
---|
925 | |
---|
926 | // |
---|
927 | // |
---|
928 | /////////////////////////////////////////////////////////////////////////////////////// |
---|