[819] | 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 | // |
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| 34 | #include "G4NeutronHPElasticData.hh" |
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| 35 | #include "G4Neutron.hh" |
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| 36 | #include "G4ElementTable.hh" |
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| 37 | #include "G4NeutronHPData.hh" |
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| 38 | |
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| 39 | G4bool G4NeutronHPElasticData::IsApplicable(const G4DynamicParticle*aP, const G4Element*) |
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| 40 | { |
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| 41 | G4bool result = true; |
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| 42 | G4double eKin = aP->GetKineticEnergy(); |
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| 43 | if(eKin>20*MeV||aP->GetDefinition()!=G4Neutron::Neutron()) result = false; |
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| 44 | return result; |
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| 45 | } |
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| 46 | |
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| 47 | G4NeutronHPElasticData::G4NeutronHPElasticData() |
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| 48 | { |
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| 49 | // TKDB |
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| 50 | theCrossSections = 0; |
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| 51 | BuildPhysicsTable(*G4Neutron::Neutron()); |
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| 52 | } |
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| 53 | |
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| 54 | G4NeutronHPElasticData::~G4NeutronHPElasticData() |
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| 55 | { |
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| 56 | // TKDB |
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| 57 | if ( theCrossSections != 0 ) |
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| 58 | theCrossSections->clearAndDestroy(); |
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| 59 | delete theCrossSections; |
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| 60 | } |
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| 61 | |
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| 62 | void G4NeutronHPElasticData::BuildPhysicsTable(const G4ParticleDefinition& aP) |
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| 63 | { |
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| 64 | |
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| 65 | if(&aP!=G4Neutron::Neutron()) |
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| 66 | throw G4HadronicException(__FILE__, __LINE__, "Attempt to use NeutronHP data for particles other than neutrons!!!"); |
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| 67 | size_t numberOfElements = G4Element::GetNumberOfElements(); |
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| 68 | // TKDB |
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| 69 | if ( theCrossSections == 0 ) theCrossSections = new G4PhysicsTable( numberOfElements ); |
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| 70 | |
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| 71 | // make a PhysicsVector for each element |
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| 72 | |
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| 73 | static const G4ElementTable *theElementTable = G4Element::GetElementTable(); |
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| 74 | for( size_t i=0; i<numberOfElements; ++i ) |
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| 75 | { |
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| 76 | G4PhysicsVector* physVec = G4NeutronHPData:: |
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| 77 | Instance()->MakePhysicsVector((*theElementTable)[i], this); |
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| 78 | theCrossSections->push_back(physVec); |
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| 79 | } |
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| 80 | } |
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| 81 | |
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| 82 | void G4NeutronHPElasticData::DumpPhysicsTable(const G4ParticleDefinition& aP) |
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| 83 | { |
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| 84 | if(&aP!=G4Neutron::Neutron()) |
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| 85 | throw G4HadronicException(__FILE__, __LINE__, "Attempt to use NeutronHP data for particles other than neutrons!!!"); |
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| 86 | |
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| 87 | // |
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| 88 | // Dump element based cross section |
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| 89 | // range 10e-5 eV to 20 MeV |
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| 90 | // 10 point per decade |
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| 91 | // in barn |
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| 92 | // |
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| 93 | |
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| 94 | G4cout << G4endl; |
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| 95 | G4cout << G4endl; |
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| 96 | G4cout << "Elastic Cross Section of Neutron HP"<< G4endl; |
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| 97 | G4cout << "(Pointwise cross-section at 0 Kelvin.)" << G4endl; |
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| 98 | G4cout << G4endl; |
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| 99 | G4cout << "Name of Element" << G4endl; |
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| 100 | G4cout << "Energy[eV] XS[barn]" << G4endl; |
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| 101 | G4cout << G4endl; |
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| 102 | |
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| 103 | size_t numberOfElements = G4Element::GetNumberOfElements(); |
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| 104 | static const G4ElementTable *theElementTable = G4Element::GetElementTable(); |
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| 105 | |
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| 106 | for ( size_t i = 0 ; i < numberOfElements ; ++i ) |
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| 107 | { |
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| 108 | |
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| 109 | G4cout << (*theElementTable)[i]->GetName() << G4endl; |
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| 110 | |
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| 111 | G4int ie = 0; |
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| 112 | |
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| 113 | for ( ie = 0 ; ie < 130 ; ie++ ) |
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| 114 | { |
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| 115 | G4double eKinetic = 1.0e-5 * std::pow ( 10.0 , ie/10.0 ) *eV; |
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| 116 | G4bool outOfRange = false; |
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| 117 | |
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| 118 | if ( eKinetic < 20*MeV ) |
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| 119 | { |
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| 120 | G4cout << eKinetic/eV << " " << (*((*theCrossSections)(i))).GetValue(eKinetic, outOfRange)/barn << G4endl; |
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| 121 | } |
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| 122 | |
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| 123 | } |
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| 124 | |
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| 125 | G4cout << G4endl; |
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| 126 | } |
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| 127 | |
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| 128 | |
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| 129 | // G4cout << "G4NeutronHPElasticData::DumpPhysicsTable still to be implemented"<<G4endl; |
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| 130 | } |
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| 131 | |
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| 132 | #include "G4Nucleus.hh" |
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| 133 | #include "G4NucleiPropertiesTable.hh" |
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| 134 | #include "G4Neutron.hh" |
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| 135 | #include "G4Electron.hh" |
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| 136 | |
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| 137 | G4double G4NeutronHPElasticData:: |
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| 138 | GetCrossSection(const G4DynamicParticle* aP, const G4Element*anE, G4double aT) |
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| 139 | { |
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| 140 | G4double result = 0; |
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| 141 | G4bool outOfRange; |
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| 142 | G4int index = anE->GetIndex(); |
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| 143 | |
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| 144 | // prepare neutron |
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| 145 | G4double eKinetic = aP->GetKineticEnergy(); |
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| 146 | |
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| 147 | // T. K. |
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| 148 | if ( getenv( "G4NEUTRONHP_NEGLECT_DOPPLER" ) ) |
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| 149 | { |
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| 150 | G4double factor = 1.0; |
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| 151 | if ( eKinetic < aT * k_Boltzmann ) |
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| 152 | { |
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| 153 | // below 0.1 eV neutrons |
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| 154 | // Have to do some, but now just igonre. |
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| 155 | // Will take care after performance check. |
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| 156 | // factor = factor * targetV; |
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| 157 | } |
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| 158 | return ( (*((*theCrossSections)(index))).GetValue(eKinetic, outOfRange) )* factor; |
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| 159 | } |
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| 160 | |
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| 161 | G4ReactionProduct theNeutron( aP->GetDefinition() ); |
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| 162 | theNeutron.SetMomentum( aP->GetMomentum() ); |
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| 163 | theNeutron.SetKineticEnergy( eKinetic ); |
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| 164 | |
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| 165 | // prepare thermal nucleus |
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| 166 | G4Nucleus aNuc; |
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| 167 | G4double eps = 0.0001; |
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| 168 | G4double theA = anE->GetN(); |
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| 169 | G4double theZ = anE->GetZ(); |
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| 170 | G4double eleMass; |
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| 171 | |
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| 172 | |
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| 173 | eleMass = ( G4NucleiPropertiesTable::GetNuclearMass(static_cast<G4int>(theZ+eps), static_cast<G4int>(theA+eps)) |
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| 174 | ) / G4Neutron::Neutron()->GetPDGMass(); |
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| 175 | |
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| 176 | G4ReactionProduct boosted; |
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| 177 | G4double aXsection; |
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| 178 | |
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| 179 | // MC integration loop |
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| 180 | G4int counter = 0; |
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| 181 | G4double buffer = 0; |
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| 182 | G4int size = G4int(std::max(10., aT/60*kelvin)); |
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| 183 | G4ThreeVector neutronVelocity = 1./G4Neutron::Neutron()->GetPDGMass()*theNeutron.GetMomentum(); |
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| 184 | G4double neutronVMag = neutronVelocity.mag(); |
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| 185 | |
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| 186 | while(counter == 0 || std::abs(buffer-result/std::max(1,counter)) > 0.03*buffer) |
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| 187 | { |
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| 188 | if(counter) buffer = result/counter; |
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| 189 | while (counter<size) |
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| 190 | { |
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| 191 | counter ++; |
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| 192 | G4ReactionProduct aThermalNuc = aNuc.GetThermalNucleus(eleMass, aT); |
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| 193 | boosted.Lorentz(theNeutron, aThermalNuc); |
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| 194 | G4double theEkin = boosted.GetKineticEnergy(); |
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| 195 | aXsection = (*((*theCrossSections)(index))).GetValue(theEkin, outOfRange); |
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| 196 | // velocity correction. |
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| 197 | G4ThreeVector targetVelocity = 1./aThermalNuc.GetMass()*aThermalNuc.GetMomentum(); |
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| 198 | aXsection *= (targetVelocity-neutronVelocity).mag()/neutronVMag; |
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| 199 | result += aXsection; |
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| 200 | } |
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| 201 | size += size; |
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| 202 | } |
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| 203 | result /= counter; |
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| 204 | /* |
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| 205 | // Checking impact of G4NEUTRONHP_NEGLECT_DOPPLER |
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| 206 | G4cout << " result " << result << " " |
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| 207 | << (*((*theCrossSections)(index))).GetValue(eKinetic, outOfRange) << " " |
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| 208 | << (*((*theCrossSections)(index))).GetValue(eKinetic, outOfRange) /result << G4endl; |
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| 209 | */ |
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| 210 | return result; |
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| 211 | } |
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