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 | // neutron_hp -- source file |
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27 | // J.P. Wellisch, Nov-1996 |
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28 | // A prototype of the low energy neutron transport model. |
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29 | // |
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30 | // 070523 add neglecting doppler broadening on the fly. T. Koi |
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31 | // 070613 fix memory leaking by T. Koi |
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32 | // 071002 enable cross section dump by T. Koi |
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33 | // 080428 change checking point of "neglecting doppler broadening" flag |
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34 | // from GetCrossSection to BuildPhysicsTable by T. Koi |
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35 | // 081024 G4NucleiPropertiesTable:: to G4NucleiProperties:: |
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36 | // |
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37 | #include "G4NeutronHPCaptureData.hh" |
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38 | #include "G4Neutron.hh" |
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39 | #include "G4ElementTable.hh" |
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40 | #include "G4NeutronHPData.hh" |
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41 | |
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42 | G4bool G4NeutronHPCaptureData::IsApplicable(const G4DynamicParticle*aP, const G4Element*) |
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43 | { |
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44 | G4bool result = true; |
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45 | G4double eKin = aP->GetKineticEnergy(); |
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46 | if(eKin>20*MeV||aP->GetDefinition()!=G4Neutron::Neutron()) result = false; |
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47 | return result; |
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48 | } |
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49 | |
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50 | G4NeutronHPCaptureData::G4NeutronHPCaptureData() |
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51 | { |
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52 | // TKDB |
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53 | theCrossSections = 0; |
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54 | onFlightDB = true; |
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55 | BuildPhysicsTable(*G4Neutron::Neutron()); |
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56 | } |
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57 | |
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58 | G4NeutronHPCaptureData::~G4NeutronHPCaptureData() |
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59 | { |
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60 | // TKDB |
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61 | if ( theCrossSections != 0 ) |
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62 | theCrossSections->clearAndDestroy(); |
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63 | |
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64 | delete theCrossSections; |
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65 | } |
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66 | |
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67 | void G4NeutronHPCaptureData::BuildPhysicsTable(const G4ParticleDefinition& aP) |
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68 | { |
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69 | if(&aP!=G4Neutron::Neutron()) |
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70 | throw G4HadronicException(__FILE__, __LINE__, "Attempt to use NeutronHP data for particles other than neutrons!!!"); |
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71 | |
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72 | //080428 |
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73 | if ( getenv( "G4NEUTRONHP_NEGLECT_DOPPLER" ) ) onFlightDB = false; |
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74 | |
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75 | size_t numberOfElements = G4Element::GetNumberOfElements(); |
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76 | // G4cout << "CALLED G4NeutronHPCaptureData::BuildPhysicsTable "<<numberOfElements<<G4endl; |
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77 | // TKDB |
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78 | if ( theCrossSections == 0 ) theCrossSections = new G4PhysicsTable( numberOfElements ); |
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79 | |
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80 | // make a PhysicsVector for each element |
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81 | |
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82 | static const G4ElementTable *theElementTable = G4Element::GetElementTable(); |
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83 | for( size_t i=0; i<numberOfElements; ++i ) |
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84 | { |
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85 | if(getenv("CaptureDataIndexDebug")) |
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86 | { |
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87 | G4int index_debug = ((*theElementTable)[i])->GetIndex(); |
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88 | G4cout << "IndexDebug "<< i <<" "<<index_debug<<G4endl; |
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89 | } |
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90 | G4PhysicsVector* physVec = G4NeutronHPData:: |
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91 | Instance()->MakePhysicsVector((*theElementTable)[i], this); |
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92 | theCrossSections->push_back(physVec); |
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93 | } |
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94 | } |
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95 | |
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96 | void G4NeutronHPCaptureData::DumpPhysicsTable(const G4ParticleDefinition& aP) |
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97 | { |
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98 | if(&aP!=G4Neutron::Neutron()) |
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99 | throw G4HadronicException(__FILE__, __LINE__, "Attempt to use NeutronHP data for particles other than neutrons!!!"); |
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100 | |
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101 | // |
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102 | // Dump element based cross section |
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103 | // range 10e-5 eV to 20 MeV |
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104 | // 10 point per decade |
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105 | // in barn |
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106 | // |
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107 | |
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108 | G4cout << G4endl; |
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109 | G4cout << G4endl; |
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110 | G4cout << "Capture Cross Section of Neutron HP"<< G4endl; |
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111 | G4cout << "(Pointwise cross-section at 0 Kelvin.)" << G4endl; |
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112 | G4cout << G4endl; |
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113 | G4cout << "Name of Element" << G4endl; |
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114 | G4cout << "Energy[eV] XS[barn]" << G4endl; |
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115 | G4cout << G4endl; |
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116 | |
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117 | size_t numberOfElements = G4Element::GetNumberOfElements(); |
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118 | static const G4ElementTable *theElementTable = G4Element::GetElementTable(); |
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119 | |
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120 | for ( size_t i = 0 ; i < numberOfElements ; ++i ) |
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121 | { |
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122 | |
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123 | G4cout << (*theElementTable)[i]->GetName() << G4endl; |
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124 | |
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125 | G4int ie = 0; |
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126 | |
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127 | for ( ie = 0 ; ie < 130 ; ie++ ) |
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128 | { |
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129 | G4double eKinetic = 1.0e-5 * std::pow ( 10.0 , ie/10.0 ) *eV; |
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130 | G4bool outOfRange = false; |
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131 | |
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132 | if ( eKinetic < 20*MeV ) |
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133 | { |
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134 | G4cout << eKinetic/eV << " " << (*((*theCrossSections)(i))).GetValue(eKinetic, outOfRange)/barn << G4endl; |
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135 | } |
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136 | |
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137 | } |
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138 | |
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139 | G4cout << G4endl; |
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140 | } |
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141 | |
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142 | |
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143 | // G4cout << "G4NeutronHPCaptureData::DumpPhysicsTable still to be implemented"<<G4endl; |
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144 | } |
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145 | |
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146 | #include "G4NucleiProperties.hh" |
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147 | |
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148 | G4double G4NeutronHPCaptureData:: |
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149 | GetCrossSection(const G4DynamicParticle* aP, const G4Element*anE, G4double aT) |
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150 | { |
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151 | G4double result = 0; |
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152 | G4bool outOfRange; |
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153 | G4int index = anE->GetIndex(); |
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154 | |
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155 | // prepare neutron |
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156 | G4double eKinetic = aP->GetKineticEnergy(); |
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157 | |
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158 | //if ( getenv( "G4NEUTRONHP_NEGLECT_DOPPLER" ) ) |
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159 | //080428 |
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160 | if ( !onFlightDB ) |
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161 | { |
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162 | G4double factor = 1.0; |
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163 | if ( eKinetic < aT * k_Boltzmann ) |
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164 | { |
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165 | // below 0.1 eV neutrons |
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166 | // Have to do some, but now just igonre. |
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167 | // Will take care after performance check. |
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168 | // factor = factor * targetV; |
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169 | } |
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170 | return ( (*((*theCrossSections)(index))).GetValue(eKinetic, outOfRange) )* factor; |
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171 | } |
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172 | |
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173 | G4ReactionProduct theNeutron( aP->GetDefinition() ); |
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174 | theNeutron.SetMomentum( aP->GetMomentum() ); |
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175 | theNeutron.SetKineticEnergy( eKinetic ); |
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176 | |
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177 | // prepare thermal nucleus |
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178 | G4Nucleus aNuc; |
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179 | G4double eps = 0.0001; |
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180 | G4double theA = anE->GetN(); |
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181 | G4double theZ = anE->GetZ(); |
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182 | G4double eleMass; |
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183 | eleMass = G4NucleiProperties::GetNuclearMass( static_cast<G4int>(theA+eps) , static_cast<G4int>(theZ+eps) ) / G4Neutron::Neutron()->GetPDGMass(); |
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184 | |
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185 | G4ReactionProduct boosted; |
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186 | G4double aXsection; |
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187 | |
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188 | // MC integration loop |
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189 | G4int counter = 0; |
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190 | G4double buffer = 0; |
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191 | G4int size = G4int(std::max(10., aT/60*kelvin)); |
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192 | G4ThreeVector neutronVelocity = 1./G4Neutron::Neutron()->GetPDGMass()*theNeutron.GetMomentum(); |
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193 | G4double neutronVMag = neutronVelocity.mag(); |
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194 | |
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195 | while(counter == 0 || std::abs(buffer-result/std::max(1,counter)) > 0.03*buffer) |
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196 | { |
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197 | if(counter) buffer = result/counter; |
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198 | while (counter<size) |
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199 | { |
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200 | counter ++; |
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201 | G4ReactionProduct aThermalNuc = aNuc.GetThermalNucleus(eleMass, aT); |
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202 | boosted.Lorentz(theNeutron, aThermalNuc); |
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203 | G4double theEkin = boosted.GetKineticEnergy(); |
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204 | aXsection = (*((*theCrossSections)(index))).GetValue(theEkin, outOfRange); |
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205 | // velocity correction, or luminosity factor... |
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206 | G4ThreeVector targetVelocity = 1./aThermalNuc.GetMass()*aThermalNuc.GetMomentum(); |
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207 | aXsection *= (targetVelocity-neutronVelocity).mag()/neutronVMag; |
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208 | result += aXsection; |
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209 | } |
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210 | size += size; |
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211 | } |
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212 | result /= counter; |
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213 | /* |
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214 | // Checking impact of G4NEUTRONHP_NEGLECT_DOPPLER |
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215 | G4cout << " result " << result << " " |
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216 | << (*((*theCrossSections)(index))).GetValue(eKinetic, outOfRange) << " " |
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217 | << (*((*theCrossSections)(index))).GetValue(eKinetic, outOfRange) /result << G4endl; |
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218 | */ |
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219 | return result; |
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220 | } |
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