| 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 | // -------------------------------------------------------------------
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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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