1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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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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23 | // * acceptance of all terms of the Geant4 Software license. * |
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24 | // ******************************************************************** |
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25 | // |
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26 | // |
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27 | // ------------------------------------------------------------------- |
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28 | // GEANT4 Class file |
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29 | // |
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30 | // For information related to this code contact: |
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31 | // |
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32 | // File name: G4XnpElasticLowE |
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33 | // |
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34 | // Author: |
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35 | // |
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36 | // Creation date: 15 April 1999 |
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37 | // |
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38 | // Modifications: |
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39 | // |
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40 | // Neutron-Proton elastic cross section |
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41 | // Linear interpolation from data table |
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42 | // |
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43 | // ------------------------------------------------------------------- |
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44 | |
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45 | #include "globals.hh" |
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46 | #include "G4ios.hh" |
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47 | #include "G4XnpElasticLowE.hh" |
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48 | #include "G4KineticTrack.hh" |
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49 | #include "G4ParticleDefinition.hh" |
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50 | #include "G4PhysicsVector.hh" |
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51 | #include "G4PhysicsLnVector.hh" |
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52 | #include "G4ParticleDefinition.hh" |
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53 | #include "G4Proton.hh" |
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54 | #include "G4Neutron.hh" |
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55 | |
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56 | const G4double G4XnpElasticLowE::_lowLimit = 0.; |
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57 | const G4double G4XnpElasticLowE::_highLimit = 3.*GeV; |
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58 | |
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59 | // Low energy limit of the cross-section table (in GeV) |
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60 | // Units are assigned while filling the PhysicsVector |
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61 | const G4double G4XnpElasticLowE::_eMinTable = 1.8964808; |
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62 | const G4double G4XnpElasticLowE::_eStepLog = 0.01; |
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63 | |
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64 | // Cross-sections in mb |
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65 | // Units are assigned while filling the PhysicsVector |
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66 | const G4int G4XnpElasticLowE::_tableSize = 101; |
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67 | const G4double G4XnpElasticLowE::_sigmaTable[101] = |
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68 | { |
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69 | 1500.0, //GF was 0.0 |
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70 | 248.20, 93.38, 55.26, 44.50, 41.33, 38.48, 37.20, 35.98, |
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71 | 35.02, 34.47, 32.48, 30.76, 29.46, 28.53, 27.84, 27.20, |
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72 | 26.53, 25.95, 25.59, 25.46, 25.00, 24.49, 24.08, 23.86, |
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73 | 23.17, 22.70, 21.88, 21.48, 20.22, 19.75, 18.97, 18.39, |
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74 | 17.98, 17.63, 17.21, 16.72, 16.68, 16.58, 16.42, 16.22, |
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75 | 15.98, 15.71, 15.42, 15.14, 14.87, 14.65, 14.44, 14.26, |
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76 | 14.10, 13.95, 13.80, 13.64, 13.47, 13.29, 13.09, 12.89, |
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77 | 12.68, 12.47, 12.27, 12.06, 11.84, 11.76, 11.69, 11.60, |
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78 | 11.50, 11.41, 11.29, 11.17, 11.06, 10.93, 10.81, 10.68, |
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79 | 10.56, 10.44, 10.33, 10.21, 10.12, 10.03, 9.96, 9.89, |
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80 | 9.83, 9.80, 9.77, 9.75, 9.74, 9.74, 9.74, 9.76, |
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81 | 9.73, 9.70, 9.68, 9.65, 9.63, 9.60, 9.57, 9.55, |
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82 | 9.52, 9.49, 9.46, 9.43 |
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83 | }; |
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84 | |
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85 | |
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86 | G4XnpElasticLowE::G4XnpElasticLowE() |
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87 | { |
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88 | // Cross-sections are available in the range (_eMin,_eMax) |
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89 | |
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90 | _eMin = _eMinTable * GeV; |
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91 | _eMin = std::exp(std::log(_eMinTable)-_eStepLog)*GeV; |
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92 | _eMax = std::exp(std::log(_eMinTable) + _tableSize * _eStepLog) * GeV; |
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93 | |
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94 | // Protections: validity limits must be compatible with available data |
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95 | |
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96 | if (_eMin < _lowLimit) |
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97 | throw G4HadronicException(__FILE__, __LINE__, "G4XnpElasticLowE::G4XnpElasticLowE - Low energy limit not valid"); |
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98 | |
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99 | if (_highLimit > _eMax) |
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100 | throw G4HadronicException(__FILE__, __LINE__, "G4XnpElasticLowE::G4XnpElasticLowE - High energy limit not valid"); |
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101 | |
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102 | _sigma = new G4PhysicsLnVector(_eMin,_eMax,_tableSize); |
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103 | G4int i; |
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104 | for (i=0; i<_tableSize; i++) |
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105 | { |
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106 | G4double value = _sigmaTable[i] * millibarn; |
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107 | _sigma->PutValue(i,value); |
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108 | } |
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109 | } |
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110 | |
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111 | |
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112 | G4XnpElasticLowE::~G4XnpElasticLowE() |
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113 | { |
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114 | delete _sigma; |
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115 | } |
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116 | |
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117 | |
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118 | G4bool G4XnpElasticLowE::operator==(const G4XnpElasticLowE &right) const |
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119 | { |
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120 | return (this == (G4XnpElasticLowE *) &right); |
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121 | } |
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122 | |
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123 | |
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124 | G4bool G4XnpElasticLowE::operator!=(const G4XnpElasticLowE &right) const |
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125 | { |
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126 | return (this != (G4XnpElasticLowE *) &right); |
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127 | } |
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128 | |
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129 | |
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130 | G4double G4XnpElasticLowE::CrossSection(const G4KineticTrack& trk1, const G4KineticTrack& trk2) const |
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131 | { |
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132 | G4double sigma = 0.; |
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133 | G4double sqrtS = (trk1.Get4Momentum() + trk2.Get4Momentum()).mag(); |
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134 | G4bool dummy = false; |
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135 | |
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136 | G4ParticleDefinition* proton = G4Proton::ProtonDefinition(); |
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137 | G4ParticleDefinition* neutron = G4Neutron::NeutronDefinition(); |
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138 | |
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139 | G4ParticleDefinition* def1 = trk1.GetDefinition(); |
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140 | G4ParticleDefinition* def2 = trk2.GetDefinition(); |
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141 | if ( (def1 == proton && def2 == neutron) || |
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142 | (def1 == neutron && def2 == proton) ) |
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143 | { |
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144 | if (sqrtS >= _eMin && sqrtS <= _eMax) |
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145 | { |
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146 | sigma = _sigma->GetValue(sqrtS,dummy); |
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147 | } else if ( sqrtS < _eMin ) |
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148 | { |
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149 | sigma = _sigma->GetValue(_eMin,dummy); |
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150 | } |
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151 | } |
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152 | |
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153 | return sigma; |
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154 | } |
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155 | |
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156 | void G4XnpElasticLowE::Print() const |
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157 | { |
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158 | // Dump the cross-section table |
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159 | G4cout << Name() << "Cross-section table: " << G4endl; |
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160 | G4bool dummy = false; |
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161 | G4int i; |
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162 | |
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163 | for (i=0; i<_tableSize; i++) |
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164 | { |
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165 | G4double e = _sigma->GetLowEdgeEnergy(i) / GeV; |
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166 | G4double sigma = _sigma->GetValue(e,dummy) / millibarn; |
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167 | G4cout << i << ") e = " << e << " GeV ---- Cross section = " << sigma << " mb " << G4endl; |
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168 | } |
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169 | |
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170 | G4VCrossSectionSource::Print(); |
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171 | } |
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172 | |
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173 | |
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174 | G4String G4XnpElasticLowE::Name() const |
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175 | { |
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176 | G4String name("npElasticLowE"); |
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177 | return name; |
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178 | } |
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179 | |
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180 | |
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181 | G4bool G4XnpElasticLowE::IsValid(G4double e) const |
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182 | { |
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183 | G4bool answer = InLimits(e,_lowLimit,_highLimit); |
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184 | |
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185 | return answer; |
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186 | } |
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187 | |
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188 | |
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