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 | // 18-Sep-2003 First version is written by T. Koi |
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27 | // 12-Nov-2003 Add energy check at lower side T. Koi |
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28 | // 15-Nov-2006 Above 10GeV/n Cross Section become constant T. Koi (SLAC/SCCS) |
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29 | // 23-Dec-2006 Isotope dependence adde by D. Wright |
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30 | // |
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31 | |
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32 | #include "G4IonsShenCrossSection.hh" |
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33 | #include "G4ParticleTable.hh" |
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34 | #include "G4IonTable.hh" |
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35 | #include "G4HadTmpUtil.hh" |
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36 | |
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37 | |
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38 | G4double G4IonsShenCrossSection:: |
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39 | GetZandACrossSection(const G4DynamicParticle* aParticle, G4int ZZ, |
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40 | G4int AA, G4double /*temperature*/) |
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41 | { |
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42 | G4double xsection = 0.0; |
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43 | |
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44 | G4int Ap = aParticle->GetDefinition()->GetBaryonNumber(); |
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45 | G4int Zp = G4int(aParticle->GetDefinition()->GetPDGCharge()/eplus + 0.5 ); |
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46 | G4double ke_per_N = aParticle->GetKineticEnergy() / Ap; |
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47 | if ( ke_per_N > 10*GeV ) ke_per_N = 10*GeV; |
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48 | |
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49 | // Apply energy check, if less than lower limit then 0 value is returned |
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50 | // if ( ke_per_N < lowerLimit ) return xsection; |
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51 | |
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52 | G4int At = AA; |
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53 | G4int Zt = ZZ; |
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54 | |
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55 | G4double one_third = 1.0 / 3.0; |
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56 | |
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57 | G4double cubicrAt = std::pow ( G4double(At) , G4double(one_third) ); |
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58 | G4double cubicrAp = std::pow ( G4double(Ap) , G4double(one_third) ); |
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59 | |
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60 | G4double Rt = 1.12 * cubicrAt - 0.94 * ( 1.0 / cubicrAt ); |
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61 | G4double Rp = 1.12 * cubicrAp - 0.94 * ( 1.0 / cubicrAp ); |
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62 | |
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63 | G4double r = Rt + Rp + 3.2; // in fm |
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64 | G4double b = 1.0; // in MeV/fm |
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65 | G4double targ_mass = |
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66 | G4ParticleTable::GetParticleTable()->GetIonTable()->GetIonMass(Zt, At); |
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67 | G4double proj_mass = aParticle->GetMass(); |
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68 | G4double proj_momentum = aParticle->GetMomentum().mag(); |
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69 | |
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70 | G4double Ecm = calEcmValue (proj_mass, targ_mass, proj_momentum); |
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71 | |
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72 | G4double B = 1.44 * Zt * Zp / r - b * Rt * Rp / ( Rt + Rp ); |
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73 | if(Ecm <= B) return xsection; |
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74 | //G4double ke_per_N = aParticle->GetKineticEnergy() / Ap; |
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75 | |
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76 | G4double c = calCeValue ( ke_per_N / MeV ); |
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77 | |
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78 | G4double R1 = r0 * (cubicrAt + cubicrAp + 1.85*cubicrAt*cubicrAp/(cubicrAt + cubicrAp) - c); |
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79 | |
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80 | G4double R2 = 1.0 * ( At - 2 * Zt ) * Zp / ( Ap * At ); |
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81 | |
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82 | |
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83 | G4double R3 = 0.176 / std::pow(G4double(Ecm), G4double(one_third)) * cubicrAt * cubicrAp /(cubicrAt + cubicrAp); |
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84 | |
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85 | G4double R = R1 + R2 + R3; |
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86 | |
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87 | xsection = 10 * pi * R * R * ( 1 - B / Ecm ); |
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88 | xsection = xsection * millibarn; // mulitply xsection by millibarn |
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89 | |
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90 | return xsection; |
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91 | } |
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92 | |
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93 | |
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94 | G4double G4IonsShenCrossSection:: |
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95 | GetCrossSection(const G4DynamicParticle* aParticle, const G4Element* anElement, |
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96 | G4double temperature) |
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97 | { |
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98 | G4int nIso = anElement->GetNumberOfIsotopes(); |
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99 | G4double xsection = 0; |
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100 | |
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101 | if (nIso) { |
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102 | G4double sig; |
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103 | G4IsotopeVector* isoVector = anElement->GetIsotopeVector(); |
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104 | G4double* abundVector = anElement->GetRelativeAbundanceVector(); |
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105 | G4int ZZ; |
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106 | G4int AA; |
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107 | |
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108 | for (G4int i = 0; i < nIso; i++) { |
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109 | ZZ = (*isoVector)[i]->GetZ(); |
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110 | AA = (*isoVector)[i]->GetN(); |
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111 | sig = GetZandACrossSection(aParticle, ZZ, AA, temperature); |
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112 | xsection += sig*abundVector[i]; |
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113 | } |
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114 | |
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115 | } else { |
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116 | G4int ZZ = G4lrint(anElement->GetZ()); |
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117 | G4int AA = G4lrint(anElement->GetN()); |
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118 | xsection = GetZandACrossSection(aParticle, ZZ, AA, temperature); |
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119 | } |
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120 | |
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121 | return xsection; |
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122 | } |
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123 | |
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124 | |
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125 | G4double |
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126 | G4IonsShenCrossSection::calEcmValue(const G4double mp, const G4double mt, |
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127 | const G4double Plab) |
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128 | { |
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129 | G4double Elab = std::sqrt ( mp * mp + Plab * Plab ); |
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130 | G4double Ecm = std::sqrt ( mp * mp + mt * mt + 2 * Elab * mt ); |
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131 | G4double Pcm = Plab * mt / Ecm; |
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132 | G4double KEcm = std::sqrt ( Pcm * Pcm + mp * mp ) - mp; |
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133 | return KEcm; |
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134 | } |
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135 | |
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136 | |
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137 | G4double G4IonsShenCrossSection::calCeValue(const G4double ke) |
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138 | { |
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139 | // Calculate c value |
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140 | // This value is indepenent from projectile and target particle |
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141 | // ke is projectile kinetic energy per nucleon in the Lab system |
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142 | // with MeV unit |
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143 | // fitting function is made by T. Koi |
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144 | // There are no data below 30 MeV/n in Kox et al., |
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145 | |
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146 | G4double Ce; |
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147 | G4double log10_ke = std::log10 ( ke ); |
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148 | if (log10_ke > 1.5) |
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149 | { |
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150 | Ce = -10.0/std::pow(G4double(log10_ke), G4double(5)) + 2.0; |
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151 | } |
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152 | else |
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153 | { |
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154 | Ce = (-10.0/std::pow(G4double(1.5), G4double(5) ) + 2.0) / |
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155 | std::pow(G4double(1.5) , G4double(3)) * std::pow(G4double(log10_ke), G4double(3)); |
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156 | } |
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157 | return Ce; |
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158 | } |
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