[819] | 1 | // |
---|
| 2 | // ******************************************************************** |
---|
| 3 | // * License and Disclaimer * |
---|
| 4 | // * * |
---|
| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
---|
| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
---|
| 7 | // * conditions of the Geant4 Software License, included in the file * |
---|
| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
---|
| 9 | // * include a list of copyright holders. * |
---|
| 10 | // * * |
---|
| 11 | // * Neither the authors of this software system, nor their employing * |
---|
| 12 | // * institutes,nor the agencies providing financial support for this * |
---|
| 13 | // * work make any representation or warranty, express or implied, * |
---|
| 14 | // * regarding this software system or assume any liability for its * |
---|
| 15 | // * use. Please see the license in the file LICENSE and URL above * |
---|
| 16 | // * for the full disclaimer and the limitation of liability. * |
---|
| 17 | // * * |
---|
| 18 | // * This code implementation is the result of the scientific and * |
---|
| 19 | // * technical work of the GEANT4 collaboration. * |
---|
| 20 | // * By using, copying, modifying or distributing the software (or * |
---|
| 21 | // * any work based on the software) you agree to acknowledge its * |
---|
| 22 | // * use in resulting scientific publications, and indicate your * |
---|
| 23 | // * acceptance of all terms of the Geant4 Software license. * |
---|
| 24 | // ******************************************************************** |
---|
| 25 | // |
---|
| 26 | // neutron_hp -- source file |
---|
| 27 | // J.P. Wellisch, Nov-1996 |
---|
| 28 | // A prototype of the low energy neutron transport model. |
---|
| 29 | // |
---|
| 30 | // 070618 fix memory leaking by T. Koi |
---|
| 31 | // 071002 enable cross section dump by T. Koi |
---|
| 32 | |
---|
| 33 | #include "G4NeutronHPFissionData.hh" |
---|
| 34 | #include "G4Neutron.hh" |
---|
| 35 | #include "G4ElementTable.hh" |
---|
| 36 | #include "G4NeutronHPData.hh" |
---|
| 37 | |
---|
| 38 | G4bool G4NeutronHPFissionData::IsApplicable(const G4DynamicParticle*aP, const G4Element*) |
---|
| 39 | { |
---|
| 40 | G4bool result = true; |
---|
| 41 | G4double eKin = aP->GetKineticEnergy(); |
---|
| 42 | if(eKin>20*MeV||aP->GetDefinition()!=G4Neutron::Neutron()) result = false; |
---|
| 43 | return result; |
---|
| 44 | } |
---|
| 45 | |
---|
| 46 | G4NeutronHPFissionData::G4NeutronHPFissionData() |
---|
| 47 | { |
---|
| 48 | theCrossSections = 0; |
---|
| 49 | BuildPhysicsTable(*G4Neutron::Neutron()); |
---|
| 50 | } |
---|
| 51 | |
---|
| 52 | G4NeutronHPFissionData::~G4NeutronHPFissionData() |
---|
| 53 | { |
---|
| 54 | |
---|
| 55 | // TKDB |
---|
| 56 | if ( theCrossSections != NULL ) |
---|
| 57 | { |
---|
| 58 | theCrossSections->clearAndDestroy(); |
---|
| 59 | delete theCrossSections; |
---|
| 60 | } |
---|
| 61 | } |
---|
| 62 | |
---|
| 63 | void G4NeutronHPFissionData::BuildPhysicsTable(const G4ParticleDefinition& aP) |
---|
| 64 | { |
---|
| 65 | if(&aP!=G4Neutron::Neutron()) |
---|
| 66 | throw G4HadronicException(__FILE__, __LINE__, "Attempt to use NeutronHP data for particles other than neutrons!!!"); |
---|
| 67 | size_t numberOfElements = G4Element::GetNumberOfElements(); |
---|
| 68 | //theCrossSections = new G4PhysicsTable( numberOfElements ); |
---|
| 69 | // TKDB |
---|
| 70 | if ( theCrossSections == NULL ) theCrossSections = new G4PhysicsTable( numberOfElements ); |
---|
| 71 | |
---|
| 72 | // make a PhysicsVector for each element |
---|
| 73 | |
---|
| 74 | static const G4ElementTable *theElementTable = G4Element::GetElementTable(); |
---|
| 75 | for( size_t i=0; i<numberOfElements; ++i ) |
---|
| 76 | { |
---|
| 77 | G4PhysicsVector* physVec = G4NeutronHPData:: |
---|
| 78 | Instance()->MakePhysicsVector((*theElementTable)[i], this); |
---|
| 79 | theCrossSections->push_back(physVec); |
---|
| 80 | } |
---|
| 81 | } |
---|
| 82 | |
---|
| 83 | void G4NeutronHPFissionData::DumpPhysicsTable(const G4ParticleDefinition& aP) |
---|
| 84 | { |
---|
| 85 | if(&aP!=G4Neutron::Neutron()) |
---|
| 86 | throw G4HadronicException(__FILE__, __LINE__, "Attempt to use NeutronHP data for particles other than neutrons!!!"); |
---|
| 87 | |
---|
| 88 | // |
---|
| 89 | // Dump element based cross section |
---|
| 90 | // range 10e-5 eV to 20 MeV |
---|
| 91 | // 10 point per decade |
---|
| 92 | // in barn |
---|
| 93 | // |
---|
| 94 | |
---|
| 95 | G4cout << G4endl; |
---|
| 96 | G4cout << G4endl; |
---|
| 97 | G4cout << "Fission Cross Section of Neutron HP"<< G4endl; |
---|
| 98 | G4cout << "(Pointwise cross-section at 0 Kelvin.)" << G4endl; |
---|
| 99 | G4cout << G4endl; |
---|
| 100 | G4cout << "Name of Element" << G4endl; |
---|
| 101 | G4cout << "Energy[eV] XS[barn]" << G4endl; |
---|
| 102 | G4cout << G4endl; |
---|
| 103 | |
---|
| 104 | size_t numberOfElements = G4Element::GetNumberOfElements(); |
---|
| 105 | static const G4ElementTable *theElementTable = G4Element::GetElementTable(); |
---|
| 106 | |
---|
| 107 | for ( size_t i = 0 ; i < numberOfElements ; ++i ) |
---|
| 108 | { |
---|
| 109 | |
---|
| 110 | G4cout << (*theElementTable)[i]->GetName() << G4endl; |
---|
| 111 | |
---|
| 112 | G4int ie = 0; |
---|
| 113 | |
---|
| 114 | for ( ie = 0 ; ie < 130 ; ie++ ) |
---|
| 115 | { |
---|
| 116 | G4double eKinetic = 1.0e-5 * std::pow ( 10.0 , ie/10.0 ) *eV; |
---|
| 117 | G4bool outOfRange = false; |
---|
| 118 | |
---|
| 119 | if ( eKinetic < 20*MeV ) |
---|
| 120 | { |
---|
| 121 | G4cout << eKinetic/eV << " " << (*((*theCrossSections)(i))).GetValue(eKinetic, outOfRange)/barn << G4endl; |
---|
| 122 | } |
---|
| 123 | |
---|
| 124 | } |
---|
| 125 | |
---|
| 126 | G4cout << G4endl; |
---|
| 127 | } |
---|
| 128 | |
---|
| 129 | //G4cout << "G4NeutronHPFissionData::DumpPhysicsTable still to be implemented"<<G4endl; |
---|
| 130 | } |
---|
| 131 | |
---|
| 132 | #include "G4NucleiPropertiesTable.hh" |
---|
| 133 | |
---|
| 134 | G4double G4NeutronHPFissionData:: |
---|
| 135 | GetCrossSection(const G4DynamicParticle* aP, const G4Element*anE, G4double aT) |
---|
| 136 | { |
---|
| 137 | G4double result = 0; |
---|
| 138 | if(anE->GetZ()<90) return result; |
---|
| 139 | G4bool outOfRange; |
---|
| 140 | G4int index = anE->GetIndex(); |
---|
| 141 | |
---|
| 142 | // prepare neutron |
---|
| 143 | G4double eKinetic = aP->GetKineticEnergy(); |
---|
| 144 | G4ReactionProduct theNeutron( aP->GetDefinition() ); |
---|
| 145 | theNeutron.SetMomentum( aP->GetMomentum() ); |
---|
| 146 | theNeutron.SetKineticEnergy( eKinetic ); |
---|
| 147 | |
---|
| 148 | // prepare thermal nucleus |
---|
| 149 | G4Nucleus aNuc; |
---|
| 150 | G4double eps = 0.0001; |
---|
| 151 | G4double theA = anE->GetN(); |
---|
| 152 | G4double theZ = anE->GetZ(); |
---|
| 153 | G4double eleMass; |
---|
| 154 | eleMass = ( G4NucleiPropertiesTable::GetNuclearMass(static_cast<G4int>(theZ+eps), static_cast<G4int>(theA+eps)) |
---|
| 155 | ) / G4Neutron::Neutron()->GetPDGMass(); |
---|
| 156 | |
---|
| 157 | G4ReactionProduct boosted; |
---|
| 158 | G4double aXsection; |
---|
| 159 | |
---|
| 160 | // MC integration loop |
---|
| 161 | G4int counter = 0; |
---|
| 162 | G4double buffer = 0; |
---|
| 163 | G4int size = G4int(std::max(10., aT/60*kelvin)); |
---|
| 164 | G4ThreeVector neutronVelocity = 1./G4Neutron::Neutron()->GetPDGMass()*theNeutron.GetMomentum(); |
---|
| 165 | G4double neutronVMag = neutronVelocity.mag(); |
---|
| 166 | |
---|
| 167 | while(counter == 0 || std::abs(buffer-result/std::max(1,counter)) > 0.01*buffer) |
---|
| 168 | { |
---|
| 169 | if(counter) buffer = result/counter; |
---|
| 170 | while (counter<size) |
---|
| 171 | { |
---|
| 172 | counter ++; |
---|
| 173 | G4ReactionProduct aThermalNuc = aNuc.GetThermalNucleus(eleMass, aT); |
---|
| 174 | boosted.Lorentz(theNeutron, aThermalNuc); |
---|
| 175 | G4double theEkin = boosted.GetKineticEnergy(); |
---|
| 176 | aXsection = (*((*theCrossSections)(index))).GetValue(theEkin, outOfRange); |
---|
| 177 | // velocity correction. |
---|
| 178 | G4ThreeVector targetVelocity = 1./aThermalNuc.GetMass()*aThermalNuc.GetMomentum(); |
---|
| 179 | aXsection *= (targetVelocity-neutronVelocity).mag()/neutronVMag; |
---|
| 180 | result += aXsection; |
---|
| 181 | } |
---|
| 182 | size += size; |
---|
| 183 | } |
---|
| 184 | result /= counter; |
---|
| 185 | return result; |
---|
| 186 | } |
---|