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 | // 05-11-21 NeutronHP or Low Energy Parameterization Models |
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28 | // Implemented by T. Koi (SLAC/SCCS) |
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29 | // If NeutronHP data do not available for an element, then Low Energy |
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30 | // Parameterization models handle the interactions of the element. |
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31 | // |
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32 | |
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33 | #include "G4NeutronHPorLCaptureData.hh" |
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34 | #include "G4Neutron.hh" |
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35 | #include "G4ElementTable.hh" |
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36 | #include "G4NeutronHPData.hh" |
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37 | |
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38 | #include "G4PhysicsVector.hh" |
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39 | |
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40 | |
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41 | |
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42 | G4NeutronHPorLCaptureData::G4NeutronHPorLCaptureData( G4NeutronHPChannel* pChannel , std::set< G4String >* pSet ) |
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43 | { |
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44 | theCaptureChannel = pChannel; |
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45 | unavailable_elements = pSet; |
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46 | } |
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47 | |
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48 | |
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49 | |
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50 | G4bool G4NeutronHPorLCaptureData::IsApplicable(const G4DynamicParticle*aP, const G4Element* anElement) |
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51 | { |
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52 | G4bool result = true; |
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53 | G4double eKin = aP->GetKineticEnergy(); |
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54 | if(eKin>20*MeV||aP->GetDefinition()!=G4Neutron::Neutron()) result = false; |
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55 | if ( unavailable_elements->find( anElement->GetName() ) != unavailable_elements->end() ) result = false; |
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56 | return result; |
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57 | } |
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58 | |
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59 | G4NeutronHPorLCaptureData::G4NeutronHPorLCaptureData() |
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60 | { |
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61 | // BuildPhysicsTable(*G4Neutron::Neutron()); |
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62 | } |
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63 | |
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64 | |
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65 | |
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66 | G4NeutronHPorLCaptureData::~G4NeutronHPorLCaptureData() |
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67 | { |
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68 | // delete theCrossSections; |
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69 | } |
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70 | |
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71 | |
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72 | |
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73 | void G4NeutronHPorLCaptureData::BuildPhysicsTable( const G4ParticleDefinition& aP ) |
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74 | { |
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75 | if( &aP!=G4Neutron::Neutron() ) |
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76 | throw G4HadronicException(__FILE__, __LINE__, "Attempt to use NeutronHP data for particles other than neutrons!!!"); |
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77 | } |
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78 | |
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79 | |
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80 | |
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81 | void G4NeutronHPorLCaptureData::DumpPhysicsTable(const G4ParticleDefinition& aP) |
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82 | { |
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83 | if(&aP!=G4Neutron::Neutron()) |
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84 | throw G4HadronicException(__FILE__, __LINE__, "Attempt to use NeutronHP data for particles other than neutrons!!!"); |
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85 | // G4cout << "G4NeutronHPorLCaptureData::DumpPhysicsTable still to be implemented"<<G4endl; |
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86 | } |
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87 | |
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88 | |
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89 | |
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90 | #include "G4Nucleus.hh" |
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91 | #include "G4NucleiPropertiesTable.hh" |
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92 | #include "G4Neutron.hh" |
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93 | #include "G4Electron.hh" |
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94 | |
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95 | G4double G4NeutronHPorLCaptureData:: |
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96 | GetCrossSection(const G4DynamicParticle* aP, const G4Element*anE, G4double aT) |
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97 | { |
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98 | |
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99 | // G4cout << "Choice G4NeutronHPorLCaptureData for element " << anE->GetName() << G4endl; |
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100 | G4double result = 0; |
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101 | // G4bool outOfRange; |
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102 | G4int index = anE->GetIndex(); |
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103 | |
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104 | // prepare neutron |
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105 | G4double eKinetic = aP->GetKineticEnergy(); |
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106 | G4ReactionProduct theNeutron( aP->GetDefinition() ); |
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107 | theNeutron.SetMomentum( aP->GetMomentum() ); |
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108 | theNeutron.SetKineticEnergy( eKinetic ); |
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109 | |
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110 | // prepare thermal nucleus |
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111 | G4Nucleus aNuc; |
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112 | G4double eps = 0.0001; |
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113 | G4double theA = anE->GetN(); |
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114 | G4double theZ = anE->GetZ(); |
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115 | G4double eleMass; |
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116 | eleMass = ( G4NucleiPropertiesTable::GetNuclearMass(static_cast<G4int>(theZ+eps), static_cast<G4int>(theA+eps)) |
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117 | ) / G4Neutron::Neutron()->GetPDGMass(); |
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118 | |
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119 | G4ReactionProduct boosted; |
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120 | G4double aXsection; |
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121 | |
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122 | // MC integration loop |
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123 | G4int counter = 0; |
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124 | G4double buffer = 0; |
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125 | G4int size = G4int(std::max(10., aT/60*kelvin)); |
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126 | G4ThreeVector neutronVelocity = 1./G4Neutron::Neutron()->GetPDGMass()*theNeutron.GetMomentum(); |
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127 | G4double neutronVMag = neutronVelocity.mag(); |
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128 | while(counter == 0 || std::abs(buffer-result/std::max(1,counter)) > 0.03*buffer) |
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129 | { |
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130 | if(counter) buffer = result/counter; |
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131 | while (counter<size) |
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132 | { |
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133 | counter ++; |
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134 | G4ReactionProduct aThermalNuc = aNuc.GetThermalNucleus(eleMass, aT); |
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135 | boosted.Lorentz(theNeutron, aThermalNuc); |
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136 | G4double theEkin = boosted.GetKineticEnergy(); |
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137 | //aXsection = (*((*theCrossSections)(index))).GetValue(theEkin, outOfRange); |
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138 | aXsection = theCaptureChannel[index].GetXsec( theEkin ); |
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139 | // velocity correction. |
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140 | G4ThreeVector targetVelocity = 1./aThermalNuc.GetMass()*aThermalNuc.GetMomentum(); |
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141 | aXsection *= (targetVelocity-neutronVelocity).mag()/neutronVMag; |
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142 | result += aXsection; |
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143 | } |
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144 | size += size; |
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145 | } |
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146 | result /= counter; |
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147 | return result; |
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148 | } |
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