[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 | // |
---|
| 27 | // ------------------------------------------------------------------- |
---|
| 28 | // GEANT4 Class file |
---|
| 29 | // |
---|
| 30 | // For information related to this code contact: |
---|
| 31 | // |
---|
| 32 | // File name: G4XnpTotalLowE |
---|
| 33 | // |
---|
| 34 | // Author: |
---|
| 35 | // |
---|
| 36 | // Creation date: 15 April 1999 |
---|
| 37 | // |
---|
| 38 | // Modifications: |
---|
| 39 | // |
---|
| 40 | // Neutron-Proton total cross section |
---|
| 41 | // Linear interpolation from data table |
---|
| 42 | // |
---|
| 43 | // ------------------------------------------------------------------- |
---|
| 44 | |
---|
| 45 | #include "globals.hh" |
---|
| 46 | #include "G4ios.hh" |
---|
| 47 | #include "G4XnpTotalLowE.hh" |
---|
| 48 | #include "G4KineticTrack.hh" |
---|
| 49 | #include "G4ParticleDefinition.hh" |
---|
| 50 | #include "G4PhysicsVector.hh" |
---|
| 51 | #include "G4PhysicsLnVector.hh" |
---|
| 52 | #include "G4ParticleDefinition.hh" |
---|
| 53 | #include "G4Proton.hh" |
---|
| 54 | #include "G4Neutron.hh" |
---|
| 55 | |
---|
| 56 | const G4double G4XnpTotalLowE::_lowLimit = 0.; |
---|
| 57 | const G4double G4XnpTotalLowE::_highLimit = 3.*GeV; |
---|
| 58 | |
---|
| 59 | // Low energy limit of the cross-section table (in GeV) |
---|
| 60 | // Units are assigned while filling the PhysicsVector |
---|
| 61 | const G4double G4XnpTotalLowE::_eMinTable = 1.8964808; |
---|
| 62 | const G4double G4XnpTotalLowE::_eStepLog = 0.01; |
---|
| 63 | |
---|
| 64 | // Cross-sections in mb |
---|
| 65 | // Units are assigned while filling the PhysicsVector |
---|
| 66 | const G4int G4XnpTotalLowE::_tableSize = 101; |
---|
| 67 | const G4double G4XnpTotalLowE::_sigmaTable[101] = |
---|
| 68 | { |
---|
| 69 | 1500.0, |
---|
| 70 | 248.20, 93.38, 55.26, 44.50, 41.33, 38.48, 37.20, 35.98, |
---|
| 71 | 35.02, 34.47, 34.37, 34.67, 35.23, 35.97, 36.75, 37.37, |
---|
| 72 | 37.77, 38.03, 38.40, 38.83, 39.26, 39.67, 40.06, 40.45, |
---|
| 73 | 40.79, 41.06, 41.31, 41.52, 41.70, 41.81, 41.87, 41.98, |
---|
| 74 | 42.12, 42.29, 42.55, 42.82, 43.01, 43.12, 43.16, 43.14, |
---|
| 75 | 43.06, 42.95, 42.81, 42.67, 42.54, 42.45, 42.38, 42.33, |
---|
| 76 | 42.30, 42.29, 42.28, 42.26, 42.24, 42.21, 42.17, 42.14, |
---|
| 77 | 42.10, 42.07, 42.06, 42.05, 42.04, 42.03, 42.02, 42.00, |
---|
| 78 | 41.97, 41.94, 41.89, 41.84, 41.79, 41.73, 41.67, 41.61, |
---|
| 79 | 41.55, 41.49, 41.44, 41.38, 41.34, 41.31, 41.29, 41.28, |
---|
| 80 | 41.27, 41.28, 41.30, 41.33, 41.36, 41.40, 41.44, 41.49, |
---|
| 81 | 41.50, 41.51, 41.51, 41.51, 41.52, 41.51, 41.51, 41.50, |
---|
| 82 | 41.50, 41.49, 41.47, 41.46 |
---|
| 83 | }; |
---|
| 84 | |
---|
| 85 | |
---|
| 86 | G4XnpTotalLowE::G4XnpTotalLowE() |
---|
| 87 | { |
---|
| 88 | // Cross-sections are available in the range (_eMin,_eMax) |
---|
| 89 | |
---|
| 90 | _eMin = _eMinTable * GeV; |
---|
| 91 | _eMin = std::exp(std::log(_eMinTable)-_eStepLog)*GeV; |
---|
| 92 | _eMax = std::exp(std::log(_eMinTable) + _tableSize * _eStepLog) * GeV; |
---|
| 93 | |
---|
| 94 | // Protections: validity limits must be compatible with available data |
---|
| 95 | // @@GF this ought to be _lowLimit < _eMin |
---|
| 96 | if (_eMin < _lowLimit) |
---|
| 97 | throw G4HadronicException(__FILE__, __LINE__, "G4XnpTotalLowE::G4XnpTotalLowE - Low energy limit not valid"); |
---|
| 98 | |
---|
| 99 | if (_highLimit > _eMax) |
---|
| 100 | throw G4HadronicException(__FILE__, __LINE__, "G4XnpTotalLowE::G4XnpTotalLowE - High energy limit not valid"); |
---|
| 101 | |
---|
| 102 | _sigma = new G4PhysicsLnVector(_eMin,_eMax,_tableSize); |
---|
| 103 | G4int i; |
---|
| 104 | for (i=0; i<_tableSize; i++) |
---|
| 105 | { |
---|
| 106 | G4double value = _sigmaTable[i] * millibarn; |
---|
| 107 | _sigma->PutValue(i,value); |
---|
| 108 | } |
---|
| 109 | } |
---|
| 110 | |
---|
| 111 | |
---|
| 112 | G4XnpTotalLowE::~G4XnpTotalLowE() |
---|
| 113 | { |
---|
| 114 | delete _sigma; |
---|
| 115 | } |
---|
| 116 | |
---|
| 117 | |
---|
| 118 | G4bool G4XnpTotalLowE::operator==(const G4XnpTotalLowE &right) const |
---|
| 119 | { |
---|
| 120 | return (this == (G4XnpTotalLowE *) &right); |
---|
| 121 | } |
---|
| 122 | |
---|
| 123 | |
---|
| 124 | G4bool G4XnpTotalLowE::operator!=(const G4XnpTotalLowE &right) const |
---|
| 125 | { |
---|
| 126 | return (this != (G4XnpTotalLowE *) &right); |
---|
| 127 | } |
---|
| 128 | |
---|
| 129 | |
---|
| 130 | G4double G4XnpTotalLowE::CrossSection(const G4KineticTrack& trk1, const G4KineticTrack& trk2) const |
---|
| 131 | { |
---|
| 132 | G4double sigma = 0.; |
---|
| 133 | G4double sqrtS = (trk1.Get4Momentum() + trk2.Get4Momentum()).mag(); |
---|
| 134 | G4bool dummy = false; |
---|
| 135 | |
---|
| 136 | G4ParticleDefinition* proton = G4Proton::ProtonDefinition(); |
---|
| 137 | G4ParticleDefinition* neutron = G4Neutron::NeutronDefinition(); |
---|
| 138 | |
---|
| 139 | G4ParticleDefinition* def1 = trk1.GetDefinition(); |
---|
| 140 | G4ParticleDefinition* def2 = trk2.GetDefinition(); |
---|
| 141 | if ( (def1 == proton && def2 == neutron) || |
---|
| 142 | (def1 == neutron && def2 == proton) ) |
---|
| 143 | { |
---|
| 144 | if (sqrtS >= _eMin && sqrtS <= _eMax) |
---|
| 145 | { |
---|
| 146 | sigma = _sigma->GetValue(sqrtS,dummy); |
---|
| 147 | } else if ( sqrtS < _eMin ) |
---|
| 148 | { |
---|
| 149 | sigma = _sigma->GetValue(_eMin,dummy); |
---|
| 150 | } |
---|
| 151 | } |
---|
| 152 | |
---|
| 153 | return sigma; |
---|
| 154 | } |
---|
| 155 | |
---|
| 156 | void G4XnpTotalLowE::Print() const |
---|
| 157 | { |
---|
| 158 | // Dump the cross-section table |
---|
| 159 | |
---|
| 160 | G4cout << Name() << "Cross-section table: " << G4endl; |
---|
| 161 | G4bool dummy = false; |
---|
| 162 | G4int i; |
---|
| 163 | |
---|
| 164 | for (i=0; i<_tableSize; i++) |
---|
| 165 | { |
---|
| 166 | G4double e = _sigma->GetLowEdgeEnergy(i) / GeV; |
---|
| 167 | G4double sigma = _sigma->GetValue(e,dummy) / millibarn; |
---|
| 168 | G4cout << i << ") e = " << e << " GeV ---- Cross section = " << sigma << " mb " << G4endl; |
---|
| 169 | } |
---|
| 170 | |
---|
| 171 | G4VCrossSectionSource::Print(); |
---|
| 172 | } |
---|
| 173 | |
---|
| 174 | |
---|
| 175 | G4String G4XnpTotalLowE::Name() const |
---|
| 176 | { |
---|
| 177 | G4String name("NNTotalLowE"); |
---|
| 178 | return name; |
---|
| 179 | } |
---|
| 180 | |
---|
| 181 | |
---|
| 182 | G4bool G4XnpTotalLowE::IsValid(G4double e) const |
---|
| 183 | { |
---|
| 184 | G4bool answer = InLimits(e,_lowLimit,_highLimit); |
---|
| 185 | |
---|
| 186 | return answer; |
---|
| 187 | } |
---|
| 188 | |
---|
| 189 | |
---|