[968] | 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 | // 24.11.08 V. Grichine - first implementation |
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| 28 | // |
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| 29 | |
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| 30 | #include "G4GGNuclNuclCrossSection.hh" |
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| 31 | |
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| 32 | #include "G4ParticleTable.hh" |
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| 33 | #include "G4IonTable.hh" |
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| 34 | #include "G4ParticleDefinition.hh" |
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| 35 | |
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| 36 | |
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| 37 | |
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| 38 | //////////////////////////////////////////////////////////////////////////////// |
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| 39 | // |
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| 40 | // |
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| 41 | |
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| 42 | G4GGNuclNuclCrossSection::G4GGNuclNuclCrossSection() |
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| 43 | : fUpperLimit( 100000 * GeV ), |
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[1055] | 44 | fLowerLimit( 0.1 * MeV ), |
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[968] | 45 | fRadiusConst( 1.08*fermi ) // 1.1, 1.3 ? |
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| 46 | { |
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| 47 | theProton = G4Proton::Proton(); |
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| 48 | theNeutron = G4Neutron::Neutron(); |
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| 49 | } |
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| 50 | |
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| 51 | /////////////////////////////////////////////////////////////////////////////////////// |
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| 52 | // |
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| 53 | // |
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| 54 | |
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| 55 | G4GGNuclNuclCrossSection::~G4GGNuclNuclCrossSection() |
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| 56 | { |
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| 57 | } |
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| 58 | |
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| 59 | |
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| 60 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 61 | // |
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| 62 | // |
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| 63 | |
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| 64 | |
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| 65 | G4bool |
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| 66 | G4GGNuclNuclCrossSection::IsApplicable(const G4DynamicParticle* aDP, |
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| 67 | const G4Element* anElement) |
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| 68 | { |
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| 69 | return IsZAApplicable(aDP, anElement->GetZ(), anElement->GetN()); |
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| 70 | } |
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| 71 | |
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| 72 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 73 | // |
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| 74 | // |
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| 75 | |
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| 76 | G4bool |
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| 77 | G4GGNuclNuclCrossSection::IsZAApplicable(const G4DynamicParticle* aDP, |
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| 78 | G4double Z, G4double) |
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| 79 | { |
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| 80 | G4bool applicable = false; |
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| 81 | // G4int baryonNumber = aDP->GetDefinition()->GetBaryonNumber(); |
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| 82 | G4double kineticEnergy = aDP->GetKineticEnergy(); |
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| 83 | |
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| 84 | // const G4ParticleDefinition* theParticle = aDP->GetDefinition(); |
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| 85 | |
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| 86 | if ( kineticEnergy >= fLowerLimit && Z > 1.5 ) applicable = true; |
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| 87 | |
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| 88 | return applicable; |
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| 89 | } |
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| 90 | |
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| 91 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 92 | // |
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| 93 | // Calculates total and inelastic Xsc, derives elastic as total - inelastic accordong to |
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| 94 | // Glauber model with Gribov correction calculated in the dipole approximation on |
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| 95 | // light cone. Gaussian density helps to calculate rest integrals of the model. |
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| 96 | // [1] B.Z. Kopeliovich, nucl-th/0306044 |
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| 97 | |
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| 98 | |
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| 99 | G4double G4GGNuclNuclCrossSection:: |
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| 100 | GetCrossSection(const G4DynamicParticle* aParticle, const G4Element* anElement, G4double T) |
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| 101 | { |
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| 102 | return GetIsoZACrossSection(aParticle, anElement->GetZ(), anElement->GetN(), T); |
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| 103 | } |
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| 104 | |
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| 105 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 106 | // |
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| 107 | // Calculates total and inelastic Xsc, derives elastic as total - inelastic accordong to |
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| 108 | // Glauber model with Gribov correction calculated in the dipole approximation on |
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| 109 | // light cone. Gaussian density of point-like nucleons helps to calculate rest integrals of the model. |
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| 110 | // [1] B.Z. Kopeliovich, nucl-th/0306044 + simplification above |
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| 111 | |
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| 112 | |
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| 113 | |
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| 114 | G4double G4GGNuclNuclCrossSection:: |
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| 115 | GetIsoZACrossSection(const G4DynamicParticle* aParticle, G4double tZ, G4double tA, G4double) |
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| 116 | { |
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[1055] | 117 | G4double xsection, sigma, cofInelastic = 2.4, cofTotal = 2.0, nucleusSquare, cB, ratio; |
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[968] | 118 | |
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| 119 | G4double pZ = aParticle->GetDefinition()->GetPDGCharge(); |
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| 120 | G4double pA = aParticle->GetDefinition()->GetBaryonNumber(); |
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| 121 | |
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| 122 | G4double pTkin = aParticle->GetKineticEnergy(); |
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| 123 | pTkin /= pA; |
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| 124 | |
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| 125 | G4double pN = pA - pZ; |
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| 126 | if( pN < 0. ) pN = 0.; |
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| 127 | |
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| 128 | G4double tN = tA - tZ; |
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| 129 | if( tN < 0. ) tN = 0.; |
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| 130 | |
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| 131 | G4double tR = GetNucleusRadius(tA); |
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| 132 | G4double pR = GetNucleusRadius(pA); |
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| 133 | |
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[1055] | 134 | cB = GetCoulombBarier(aParticle, tZ, tA, pR, tR); |
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| 135 | |
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| 136 | if(cB > 0.) |
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| 137 | { |
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| 138 | |
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| 139 | sigma = (pZ*tZ+pN*tN)*GetHadronNucleonXscNS(theProton, pTkin, theProton) + |
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[968] | 140 | (pZ*tN+pN*tZ)*GetHadronNucleonXscNS(theProton, pTkin, theNeutron); |
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| 141 | |
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[1055] | 142 | nucleusSquare = cofTotal*pi*( pR*pR + tR*tR ); // basically 2piRR |
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[968] | 143 | |
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[1055] | 144 | ratio = sigma/nucleusSquare; |
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[968] | 145 | |
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[1055] | 146 | xsection = nucleusSquare*std::log( 1. + ratio ); |
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[968] | 147 | |
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[1055] | 148 | fTotalXsc = xsection; |
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[968] | 149 | |
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[1055] | 150 | fTotalXsc *= cB; |
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[968] | 151 | |
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[1055] | 152 | fInelasticXsc = nucleusSquare*std::log( 1. + cofInelastic*ratio )/cofInelastic; |
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[968] | 153 | |
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[1055] | 154 | fInelasticXsc *= cB; |
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[968] | 155 | |
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[1055] | 156 | fElasticXsc = fTotalXsc - fInelasticXsc; |
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[968] | 157 | |
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[1055] | 158 | // if (fElasticXsc < DBL_MIN) fElasticXsc = DBL_MIN; |
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| 159 | /* |
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| 160 | G4double difratio = ratio/(1.+ratio); |
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| 161 | |
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| 162 | fDiffractionXsc = 0.5*nucleusSquare*( difratio - std::log( 1. + difratio ) ); |
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| 163 | */ |
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| 164 | // production to be checked !!! edit MK xsc |
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| 165 | |
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| 166 | sigma = (pZ*tZ+pN*tN)*GetHadronNucleonXscMK(theProton, pTkin, theProton) + |
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[968] | 167 | (pZ*tN+pN*tZ)*GetHadronNucleonXscMK(theProton, pTkin, theNeutron); |
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| 168 | |
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[1055] | 169 | ratio = sigma/nucleusSquare; |
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[968] | 170 | |
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[1055] | 171 | fProductionXsc = nucleusSquare*std::log( 1. + cofInelastic*ratio )/cofInelastic; |
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[968] | 172 | |
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[1055] | 173 | if (fElasticXsc < 0.) fElasticXsc = 0.; |
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| 174 | } |
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| 175 | else |
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| 176 | { |
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| 177 | fInelasticXsc = 0.; |
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| 178 | fTotalXsc = 0.; |
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| 179 | fElasticXsc = 0.; |
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| 180 | fProductionXsc = 0.; |
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| 181 | } |
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| 182 | return fInelasticXsc; // xsection; |
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| 183 | } |
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[968] | 184 | |
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[1055] | 185 | //////////////////////////////////////////////////////////////////////////////////////// |
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| 186 | // |
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| 187 | // |
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| 188 | |
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| 189 | G4double G4GGNuclNuclCrossSection:: |
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| 190 | GetCoulombBarier(const G4DynamicParticle* aParticle, G4double tZ, G4double tA, G4double pR, G4double tR) |
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| 191 | { |
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| 192 | G4double ratio; |
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| 193 | G4double pZ = aParticle->GetDefinition()->GetPDGCharge(); |
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| 194 | |
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| 195 | |
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| 196 | G4double pTkin = aParticle->GetKineticEnergy(); |
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| 197 | // G4double pPlab = aParticle->GetTotalMomentum(); |
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| 198 | G4double pM = aParticle->GetDefinition()->GetPDGMass(); |
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| 199 | // G4double tM = tZ*proton_mass_c2 + (tA-tZ)*neutron_mass_c2; // ~ 1% accuracy |
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| 200 | G4double tM = G4ParticleTable::GetParticleTable()->GetIonTable()->GetIonMass( G4int(tZ), G4int(tA) ); |
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| 201 | G4double pElab = pTkin + pM; |
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| 202 | G4double totEcm = std::sqrt(pM*pM + tM*tM + 2.*pElab*tM); |
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| 203 | // G4double pPcm = pPlab*tM/totEcm; |
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| 204 | // G4double pTcm = std::sqrt(pM*pM + pPcm*pPcm) - pM; |
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| 205 | G4double totTcm = totEcm - pM -tM; |
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| 206 | |
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| 207 | G4double bC = fine_structure_const*hbarc*pZ*tZ; |
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| 208 | bC /= pR + tR; |
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| 209 | bC /= 2.; // 4., 2. parametrisation cof ??? vmg |
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| 210 | |
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| 211 | // G4cout<<"pTkin = "<<pTkin/GeV<<"; pPlab = " |
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| 212 | // <<pPlab/GeV<<"; bC = "<<bC/GeV<<"; pTcm = "<<pTcm/GeV<<G4endl; |
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| 213 | |
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| 214 | if( totTcm <= bC ) ratio = 0.; |
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| 215 | else ratio = 1. - bC/totTcm; |
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| 216 | |
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| 217 | // if(ratio < DBL_MIN) ratio = DBL_MIN; |
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| 218 | if( ratio < 0.) ratio = 0.; |
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| 219 | |
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| 220 | // G4cout <<"ratio = "<<ratio<<G4endl; |
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| 221 | return ratio; |
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[968] | 222 | } |
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| 223 | |
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[1055] | 224 | |
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[968] | 225 | ////////////////////////////////////////////////////////////////////////// |
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| 226 | // |
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| 227 | // Return single-diffraction/inelastic cross-section ratio |
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| 228 | |
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| 229 | G4double G4GGNuclNuclCrossSection:: |
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| 230 | GetRatioSD(const G4DynamicParticle* aParticle, G4double tA, G4double tZ) |
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| 231 | { |
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| 232 | G4double sigma, cofInelastic = 2.4, cofTotal = 2.0, nucleusSquare, ratio; |
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| 233 | |
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| 234 | G4double pZ = aParticle->GetDefinition()->GetPDGCharge(); |
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| 235 | G4double pA = aParticle->GetDefinition()->GetBaryonNumber(); |
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| 236 | |
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| 237 | G4double pTkin = aParticle->GetKineticEnergy(); |
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| 238 | pTkin /= pA; |
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| 239 | |
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| 240 | G4double pN = pA - pZ; |
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| 241 | if( pN < 0. ) pN = 0.; |
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| 242 | |
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| 243 | G4double tN = tA - tZ; |
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| 244 | if( tN < 0. ) tN = 0.; |
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| 245 | |
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| 246 | G4double tR = GetNucleusRadius(tA); |
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| 247 | G4double pR = GetNucleusRadius(pA); |
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| 248 | |
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| 249 | sigma = (pZ*tZ+pN*tN)*GetHadronNucleonXscNS(theProton, pTkin, theProton) + |
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| 250 | (pZ*tN+pN*tZ)*GetHadronNucleonXscNS(theProton, pTkin, theNeutron); |
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| 251 | |
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| 252 | nucleusSquare = cofTotal*pi*( pR*pR + tR*tR ); // basically 2piRR |
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| 253 | |
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| 254 | ratio = sigma/nucleusSquare; |
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| 255 | |
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| 256 | |
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| 257 | fInelasticXsc = nucleusSquare*std::log( 1. + cofInelastic*ratio )/cofInelastic; |
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| 258 | |
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| 259 | G4double difratio = ratio/(1.+ratio); |
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| 260 | |
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| 261 | fDiffractionXsc = 0.5*nucleusSquare*( difratio - std::log( 1. + difratio ) ); |
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| 262 | |
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| 263 | if (fInelasticXsc > 0.) ratio = fDiffractionXsc/fInelasticXsc; |
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| 264 | else ratio = 0.; |
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| 265 | |
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| 266 | return ratio; |
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| 267 | } |
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| 268 | |
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| 269 | ////////////////////////////////////////////////////////////////////////// |
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| 270 | // |
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| 271 | // Return suasi-elastic/inelastic cross-section ratio |
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| 272 | |
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| 273 | G4double G4GGNuclNuclCrossSection:: |
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| 274 | GetRatioQE(const G4DynamicParticle* aParticle, G4double tA, G4double tZ) |
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| 275 | { |
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| 276 | G4double sigma, cofInelastic = 2.4, cofTotal = 2.0, nucleusSquare, ratio; |
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| 277 | |
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| 278 | G4double pZ = aParticle->GetDefinition()->GetPDGCharge(); |
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| 279 | G4double pA = aParticle->GetDefinition()->GetBaryonNumber(); |
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| 280 | |
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| 281 | G4double pTkin = aParticle->GetKineticEnergy(); |
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| 282 | pTkin /= pA; |
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| 283 | |
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| 284 | G4double pN = pA - pZ; |
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| 285 | if( pN < 0. ) pN = 0.; |
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| 286 | |
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| 287 | G4double tN = tA - tZ; |
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| 288 | if( tN < 0. ) tN = 0.; |
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| 289 | |
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| 290 | G4double tR = GetNucleusRadius(tA); |
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| 291 | G4double pR = GetNucleusRadius(pA); |
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| 292 | |
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| 293 | sigma = (pZ*tZ+pN*tN)*GetHadronNucleonXscNS(theProton, pTkin, theProton) + |
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| 294 | (pZ*tN+pN*tZ)*GetHadronNucleonXscNS(theProton, pTkin, theNeutron); |
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| 295 | |
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| 296 | nucleusSquare = cofTotal*pi*( pR*pR + tR*tR ); // basically 2piRR |
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| 297 | |
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| 298 | ratio = sigma/nucleusSquare; |
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| 299 | |
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| 300 | fInelasticXsc = nucleusSquare*std::log( 1. + cofInelastic*ratio )/cofInelastic; |
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| 301 | |
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| 302 | // sigma = GetHNinelasticXsc(aParticle, tA, tZ); |
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| 303 | ratio = sigma/nucleusSquare; |
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| 304 | |
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| 305 | fProductionXsc = nucleusSquare*std::log( 1. + cofInelastic*ratio )/cofInelastic; |
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| 306 | |
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| 307 | if (fInelasticXsc > fProductionXsc) ratio = (fInelasticXsc-fProductionXsc)/fInelasticXsc; |
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| 308 | else ratio = 0.; |
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| 309 | if ( ratio < 0. ) ratio = 0.; |
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| 310 | |
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| 311 | return ratio; |
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| 312 | } |
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| 313 | |
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| 314 | ///////////////////////////////////////////////////////////////////////////////////// |
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| 315 | // |
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| 316 | // Returns hadron-nucleon Xsc according to differnt parametrisations: |
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| 317 | // [2] E. Levin, hep-ph/9710546 |
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| 318 | // [3] U. Dersch, et al, hep-ex/9910052 |
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| 319 | // [4] M.J. Longo, et al, Phys.Rev.Lett. 33 (1974) 725 |
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| 320 | |
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| 321 | G4double |
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| 322 | G4GGNuclNuclCrossSection::GetHadronNucleonXsc(const G4DynamicParticle* aParticle, |
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| 323 | const G4Element* anElement ) |
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| 324 | { |
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| 325 | G4double At = anElement->GetN(); // number of nucleons |
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| 326 | G4double Zt = anElement->GetZ(); // number of protons |
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| 327 | |
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| 328 | |
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| 329 | return GetHadronNucleonXsc( aParticle, At, Zt ); |
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| 330 | } |
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| 331 | |
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| 332 | |
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| 333 | |
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| 334 | |
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| 335 | ///////////////////////////////////////////////////////////////////////////////////// |
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| 336 | // |
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| 337 | // Returns hadron-nucleon Xsc according to differnt parametrisations: |
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| 338 | // [2] E. Levin, hep-ph/9710546 |
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| 339 | // [3] U. Dersch, et al, hep-ex/9910052 |
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| 340 | // [4] M.J. Longo, et al, Phys.Rev.Lett. 33 (1974) 725 |
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| 341 | |
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| 342 | G4double |
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| 343 | G4GGNuclNuclCrossSection::GetHadronNucleonXsc(const G4DynamicParticle* aParticle, |
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| 344 | G4double At, G4double Zt ) |
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| 345 | { |
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| 346 | G4double xsection = 0.; |
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| 347 | |
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| 348 | |
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| 349 | G4double targ_mass = G4ParticleTable::GetParticleTable()-> |
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| 350 | GetIonTable()->GetIonMass( G4int(Zt+0.5) , G4int(At+0.5) ); |
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| 351 | |
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| 352 | targ_mass = 0.939*GeV; // ~mean neutron and proton ??? |
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| 353 | |
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| 354 | G4double proj_mass = aParticle->GetMass(); |
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| 355 | G4double proj_momentum = aParticle->GetMomentum().mag(); |
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| 356 | G4double sMand = CalcMandelstamS ( proj_mass , targ_mass , proj_momentum ); |
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| 357 | |
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| 358 | sMand /= GeV*GeV; // in GeV for parametrisation |
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| 359 | proj_momentum /= GeV; |
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| 360 | |
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| 361 | const G4ParticleDefinition* pParticle = aParticle->GetDefinition(); |
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| 362 | |
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| 363 | |
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| 364 | if(pParticle == theNeutron) // as proton ??? |
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| 365 | { |
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| 366 | xsection = At*(21.70*std::pow(sMand,0.0808) + 56.08*std::pow(sMand,-0.4525)); |
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| 367 | } |
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| 368 | else if(pParticle == theProton) |
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| 369 | { |
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| 370 | xsection = At*(21.70*std::pow(sMand,0.0808) + 56.08*std::pow(sMand,-0.4525)); |
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| 371 | // xsection = At*( 49.51*std::pow(sMand,-0.097) + 0.314*std::log(sMand)*std::log(sMand) ); |
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| 372 | // xsection = At*( 38.4 + 0.85*std::abs(std::pow(log(sMand),1.47)) ); |
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| 373 | } |
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| 374 | |
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| 375 | xsection *= millibarn; |
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| 376 | return xsection; |
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| 377 | } |
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| 378 | |
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| 379 | |
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| 380 | ///////////////////////////////////////////////////////////////////////////////////// |
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| 381 | // |
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| 382 | // Returns hadron-nucleon Xsc according to PDG parametrisation (2005): |
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| 383 | // http://pdg.lbl.gov/2006/reviews/hadronicrpp.pdf |
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| 384 | |
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| 385 | G4double |
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| 386 | G4GGNuclNuclCrossSection::GetHadronNucleonXscPDG(const G4DynamicParticle* aParticle, |
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| 387 | const G4Element* anElement ) |
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| 388 | { |
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| 389 | G4double At = anElement->GetN(); // number of nucleons |
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| 390 | G4double Zt = anElement->GetZ(); // number of protons |
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| 391 | |
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| 392 | |
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| 393 | return GetHadronNucleonXscPDG( aParticle, At, Zt ); |
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| 394 | } |
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| 395 | |
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| 396 | |
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| 397 | |
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| 398 | |
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| 399 | ///////////////////////////////////////////////////////////////////////////////////// |
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| 400 | // |
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| 401 | // Returns hadron-nucleon Xsc according to PDG parametrisation (2005): |
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| 402 | // http://pdg.lbl.gov/2006/reviews/hadronicrpp.pdf |
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| 403 | // At = number of nucleons, Zt = number of protons |
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| 404 | |
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| 405 | G4double |
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| 406 | G4GGNuclNuclCrossSection::GetHadronNucleonXscPDG(const G4DynamicParticle* aParticle, |
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| 407 | G4double At, G4double Zt ) |
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| 408 | { |
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| 409 | G4double xsection = 0.; |
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| 410 | |
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| 411 | G4double Nt = At-Zt; // number of neutrons |
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| 412 | if (Nt < 0.) Nt = 0.; |
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| 413 | |
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| 414 | |
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| 415 | G4double targ_mass = G4ParticleTable::GetParticleTable()-> |
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| 416 | GetIonTable()->GetIonMass( G4int(Zt+0.5) , G4int(At+0.5) ); |
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| 417 | |
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| 418 | targ_mass = 0.939*GeV; // ~mean neutron and proton ??? |
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| 419 | |
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| 420 | G4double proj_mass = aParticle->GetMass(); |
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| 421 | G4double proj_momentum = aParticle->GetMomentum().mag(); |
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| 422 | |
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| 423 | G4double sMand = CalcMandelstamS ( proj_mass , targ_mass , proj_momentum ); |
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| 424 | |
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| 425 | sMand /= GeV*GeV; // in GeV for parametrisation |
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| 426 | |
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| 427 | // General PDG fit constants |
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| 428 | |
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| 429 | G4double s0 = 5.38*5.38; // in Gev^2 |
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| 430 | G4double eta1 = 0.458; |
---|
| 431 | G4double eta2 = 0.458; |
---|
| 432 | G4double B = 0.308; |
---|
| 433 | |
---|
| 434 | |
---|
| 435 | const G4ParticleDefinition* pParticle = aParticle->GetDefinition(); |
---|
| 436 | |
---|
| 437 | |
---|
| 438 | if(pParticle == theNeutron) // proton-neutron fit |
---|
| 439 | { |
---|
| 440 | xsection = Zt*( 35.80 + B*std::pow(std::log(sMand/s0),2.) |
---|
| 441 | + 40.15*std::pow(sMand,-eta1) - 30.*std::pow(sMand,-eta2)); |
---|
| 442 | xsection += Nt*( 35.45 + B*std::pow(std::log(sMand/s0),2.) |
---|
| 443 | + 42.53*std::pow(sMand,-eta1) - 33.34*std::pow(sMand,-eta2)); // pp for nn |
---|
| 444 | } |
---|
| 445 | else if(pParticle == theProton) |
---|
| 446 | { |
---|
| 447 | |
---|
| 448 | xsection = Zt*( 35.45 + B*std::pow(std::log(sMand/s0),2.) |
---|
| 449 | + 42.53*std::pow(sMand,-eta1) - 33.34*std::pow(sMand,-eta2)); |
---|
| 450 | |
---|
| 451 | xsection += Nt*( 35.80 + B*std::pow(std::log(sMand/s0),2.) |
---|
| 452 | + 40.15*std::pow(sMand,-eta1) - 30.*std::pow(sMand,-eta2)); |
---|
| 453 | } |
---|
| 454 | xsection *= millibarn; // parametrised in mb |
---|
| 455 | return xsection; |
---|
| 456 | } |
---|
| 457 | |
---|
| 458 | |
---|
| 459 | |
---|
| 460 | |
---|
| 461 | ///////////////////////////////////////////////////////////////////////////////////// |
---|
| 462 | // |
---|
| 463 | // Returns nucleon-nucleon cross-section based on N. Starkov parametrisation of |
---|
| 464 | // data from mainly http://wwwppds.ihep.su:8001/c5-6A.html database |
---|
| 465 | // projectile nucleon is pParticle with pTkin shooting target nucleon tParticle |
---|
| 466 | |
---|
| 467 | G4double |
---|
| 468 | G4GGNuclNuclCrossSection::GetHadronNucleonXscNS( G4ParticleDefinition* pParticle, |
---|
| 469 | G4double pTkin, |
---|
| 470 | G4ParticleDefinition* tParticle) |
---|
| 471 | { |
---|
| 472 | G4double xsection(0), Delta, A0, B0; |
---|
| 473 | G4double hpXsc(0); |
---|
| 474 | G4double hnXsc(0); |
---|
| 475 | |
---|
| 476 | |
---|
| 477 | G4double targ_mass = tParticle->GetPDGMass(); |
---|
| 478 | G4double proj_mass = pParticle->GetPDGMass(); |
---|
| 479 | |
---|
| 480 | G4double proj_energy = proj_mass + pTkin; |
---|
| 481 | G4double proj_momentum = std::sqrt(pTkin*(pTkin+2*proj_mass)); |
---|
| 482 | |
---|
| 483 | G4double sMand = CalcMandelstamS ( proj_mass , targ_mass , proj_momentum ); |
---|
| 484 | |
---|
| 485 | sMand /= GeV*GeV; // in GeV for parametrisation |
---|
| 486 | proj_momentum /= GeV; |
---|
| 487 | proj_energy /= GeV; |
---|
| 488 | proj_mass /= GeV; |
---|
| 489 | |
---|
| 490 | // General PDG fit constants |
---|
| 491 | |
---|
| 492 | // G4double s0 = 5.38*5.38; // in Gev^2 |
---|
| 493 | // G4double eta1 = 0.458; |
---|
| 494 | // G4double eta2 = 0.458; |
---|
| 495 | // G4double B = 0.308; |
---|
| 496 | |
---|
| 497 | |
---|
| 498 | |
---|
| 499 | |
---|
| 500 | |
---|
| 501 | if( proj_momentum >= 10. ) // high energy: pp = nn = np |
---|
| 502 | // if( proj_momentum >= 2.) |
---|
| 503 | { |
---|
| 504 | Delta = 1.; |
---|
| 505 | |
---|
| 506 | if( proj_energy < 40. ) Delta = 0.916+0.0021*proj_energy; |
---|
| 507 | |
---|
| 508 | if( proj_momentum >= 10.) |
---|
| 509 | { |
---|
| 510 | B0 = 7.5; |
---|
| 511 | A0 = 100. - B0*std::log(3.0e7); |
---|
| 512 | |
---|
| 513 | xsection = A0 + B0*std::log(proj_energy) - 11 |
---|
| 514 | + 103*std::pow(2*0.93827*proj_energy + proj_mass*proj_mass+ |
---|
| 515 | 0.93827*0.93827,-0.165); // mb |
---|
| 516 | } |
---|
| 517 | } |
---|
| 518 | else // low energy pp = nn != np |
---|
| 519 | { |
---|
| 520 | if(pParticle == tParticle) // pp or nn // nn to be pp |
---|
| 521 | { |
---|
| 522 | if( proj_momentum < 0.73 ) |
---|
| 523 | { |
---|
| 524 | hnXsc = 23 + 50*( std::pow( std::log(0.73/proj_momentum), 3.5 ) ); |
---|
| 525 | } |
---|
| 526 | else if( proj_momentum < 1.05 ) |
---|
| 527 | { |
---|
| 528 | hnXsc = 23 + 40*(std::log(proj_momentum/0.73))* |
---|
| 529 | (std::log(proj_momentum/0.73)); |
---|
| 530 | } |
---|
| 531 | else // if( proj_momentum < 10. ) |
---|
| 532 | { |
---|
| 533 | hnXsc = 39.0 + |
---|
| 534 | 75*(proj_momentum - 1.2)/(std::pow(proj_momentum,3.0) + 0.15); |
---|
| 535 | } |
---|
| 536 | xsection = hnXsc; |
---|
| 537 | } |
---|
| 538 | else // pn to be np |
---|
| 539 | { |
---|
| 540 | if( proj_momentum < 0.8 ) |
---|
| 541 | { |
---|
| 542 | hpXsc = 33+30*std::pow(std::log(proj_momentum/1.3),4.0); |
---|
| 543 | } |
---|
| 544 | else if( proj_momentum < 1.4 ) |
---|
| 545 | { |
---|
| 546 | hpXsc = 33+30*std::pow(std::log(proj_momentum/0.95),2.0); |
---|
| 547 | } |
---|
| 548 | else // if( proj_momentum < 10. ) |
---|
| 549 | { |
---|
| 550 | hpXsc = 33.3+ |
---|
| 551 | 20.8*(std::pow(proj_momentum,2.0)-1.35)/ |
---|
| 552 | (std::pow(proj_momentum,2.50)+0.95); |
---|
| 553 | } |
---|
| 554 | xsection = hpXsc; |
---|
| 555 | } |
---|
| 556 | } |
---|
| 557 | xsection *= millibarn; // parametrised in mb |
---|
| 558 | return xsection; |
---|
| 559 | } |
---|
| 560 | |
---|
| 561 | /* |
---|
| 562 | ///////////////////////////////////////////////////////////////////////////////////// |
---|
| 563 | // |
---|
| 564 | // Returns hadron-nucleon inelastic cross-section based on proper parametrisation |
---|
| 565 | |
---|
| 566 | G4double |
---|
| 567 | G4GGNuclNuclCrossSection::GetHNinelasticXsc(const G4DynamicParticle* aParticle, |
---|
| 568 | const G4Element* anElement ) |
---|
| 569 | { |
---|
| 570 | G4double At = anElement->GetN(); // number of nucleons |
---|
| 571 | G4double Zt = anElement->GetZ(); // number of protons |
---|
| 572 | |
---|
| 573 | |
---|
| 574 | return GetHNinelasticXsc( aParticle, At, Zt ); |
---|
| 575 | } |
---|
| 576 | |
---|
| 577 | ///////////////////////////////////////////////////////////////////////////////////// |
---|
| 578 | // |
---|
| 579 | // Returns hadron-nucleon inelastic cross-section based on FTF-parametrisation |
---|
| 580 | |
---|
| 581 | G4double |
---|
| 582 | G4GGNuclNuclCrossSection::GetHNinelasticXsc(const G4DynamicParticle* aParticle, |
---|
| 583 | G4double At, G4double Zt ) |
---|
| 584 | { |
---|
| 585 | // G4ParticleDefinition* hadron = aParticle->GetDefinition(); |
---|
| 586 | G4double sumInelastic, Nt = At - Zt; |
---|
| 587 | |
---|
| 588 | if(Nt < 0.) Nt = 0.; |
---|
| 589 | |
---|
| 590 | sumInelastic = Zt*GetHadronNucleonXscMK(aParticle, theProton); |
---|
| 591 | sumInelastic += Nt*GetHadronNucleonXscMK(aParticle, theNeutron); |
---|
| 592 | |
---|
| 593 | return sumInelastic; |
---|
| 594 | } |
---|
| 595 | */ |
---|
| 596 | |
---|
| 597 | ///////////////////////////////////////////////////////////////////////////////////// |
---|
| 598 | // |
---|
| 599 | // Returns hadron-nucleon inelastic cross-section based on FTF-parametrisation |
---|
| 600 | |
---|
| 601 | G4double |
---|
| 602 | G4GGNuclNuclCrossSection::GetHNinelasticXscVU(const G4DynamicParticle* aParticle, |
---|
| 603 | G4double At, G4double Zt ) |
---|
| 604 | { |
---|
| 605 | G4int PDGcode = aParticle->GetDefinition()->GetPDGEncoding(); |
---|
| 606 | G4int absPDGcode = std::abs(PDGcode); |
---|
| 607 | |
---|
| 608 | G4double Elab = aParticle->GetTotalEnergy(); |
---|
| 609 | // (s - 2*0.88*GeV*GeV)/(2*0.939*GeV)/GeV; |
---|
| 610 | G4double Plab = aParticle->GetMomentum().mag(); |
---|
| 611 | // std::sqrt(Elab * Elab - 0.88); |
---|
| 612 | |
---|
| 613 | Elab /= GeV; |
---|
| 614 | Plab /= GeV; |
---|
| 615 | |
---|
| 616 | G4double LogPlab = std::log( Plab ); |
---|
| 617 | G4double sqrLogPlab = LogPlab * LogPlab; |
---|
| 618 | |
---|
| 619 | //G4cout<<"Plab = "<<Plab<<G4endl; |
---|
| 620 | |
---|
| 621 | G4double NumberOfTargetProtons = Zt; |
---|
| 622 | G4double NumberOfTargetNucleons = At; |
---|
| 623 | G4double NumberOfTargetNeutrons = NumberOfTargetNucleons - NumberOfTargetProtons; |
---|
| 624 | |
---|
| 625 | if(NumberOfTargetNeutrons < 0.) NumberOfTargetNeutrons = 0.; |
---|
| 626 | |
---|
| 627 | G4double Xtotal = 0., Xelastic = 0., Xinelastic =0.; |
---|
| 628 | |
---|
| 629 | if( absPDGcode > 1000 ) //------Projectile is baryon -------- |
---|
| 630 | { |
---|
| 631 | G4double XtotPP = 48.0 + 0. *std::pow(Plab, 0. ) + |
---|
| 632 | 0.522*sqrLogPlab - 4.51*LogPlab; |
---|
| 633 | |
---|
| 634 | G4double XtotPN = 47.3 + 0. *std::pow(Plab, 0. ) + |
---|
| 635 | 0.513*sqrLogPlab - 4.27*LogPlab; |
---|
| 636 | |
---|
| 637 | G4double XelPP = 11.9 + 26.9*std::pow(Plab,-1.21) + |
---|
| 638 | 0.169*sqrLogPlab - 1.85*LogPlab; |
---|
| 639 | |
---|
| 640 | G4double XelPN = 11.9 + 26.9*std::pow(Plab,-1.21) + |
---|
| 641 | 0.169*sqrLogPlab - 1.85*LogPlab; |
---|
| 642 | |
---|
| 643 | Xtotal = ( NumberOfTargetProtons * XtotPP + |
---|
| 644 | NumberOfTargetNeutrons * XtotPN ); |
---|
| 645 | |
---|
| 646 | Xelastic = ( NumberOfTargetProtons * XelPP + |
---|
| 647 | NumberOfTargetNeutrons * XelPN ); |
---|
| 648 | } |
---|
| 649 | Xinelastic = Xtotal - Xelastic; |
---|
| 650 | |
---|
| 651 | if(Xinelastic < 0.) Xinelastic = 0.; |
---|
| 652 | |
---|
| 653 | return Xinelastic*= millibarn; |
---|
| 654 | } |
---|
| 655 | |
---|
| 656 | ///////////////////////////////////////////////////////////////////////////////////// |
---|
| 657 | // |
---|
| 658 | // Returns hadron-nucleon cross-section based on Mikhail Kossov CHIPS parametrisation of |
---|
| 659 | // data from G4QuasiFreeRatios class |
---|
| 660 | |
---|
| 661 | G4double |
---|
| 662 | G4GGNuclNuclCrossSection::GetHadronNucleonXscMK(G4ParticleDefinition* pParticle, G4double pTkin, |
---|
| 663 | G4ParticleDefinition* nucleon ) |
---|
| 664 | { |
---|
| 665 | G4int I = -1; |
---|
| 666 | G4int PDG = pParticle->GetPDGEncoding(); |
---|
| 667 | G4double totalXsc = 0; |
---|
| 668 | G4double elasticXsc = 0; |
---|
| 669 | G4double inelasticXsc; |
---|
| 670 | // G4int absPDG = std::abs(PDG); |
---|
| 671 | |
---|
| 672 | G4double pM = pParticle->GetPDGMass(); |
---|
| 673 | G4double p = std::sqrt(pTkin*(pTkin+2*pM))/GeV; |
---|
| 674 | |
---|
| 675 | G4bool F = false; |
---|
| 676 | if(nucleon == theProton) F = true; |
---|
| 677 | else if(nucleon == theNeutron) F = false; |
---|
| 678 | else |
---|
| 679 | { |
---|
| 680 | G4cout << "nucleon is not proton or neutron, return xsc for proton" << G4endl; |
---|
| 681 | F = true; |
---|
| 682 | } |
---|
| 683 | |
---|
| 684 | G4bool kfl = true; // Flag of K0/aK0 oscillation |
---|
| 685 | G4bool kf = false; |
---|
| 686 | |
---|
| 687 | if( PDG == 130 || PDG == 310 ) |
---|
| 688 | { |
---|
| 689 | kf = true; |
---|
| 690 | if( G4UniformRand() > .5 ) kfl = false; |
---|
| 691 | } |
---|
| 692 | if ( (PDG == 2212 && F) || (PDG == 2112 && !F) ) I = 0; // pp/nn |
---|
| 693 | else if( (PDG == 2112 && F) || (PDG == 2212 && !F) ) I = 1; // np/pn |
---|
| 694 | else |
---|
| 695 | { |
---|
| 696 | G4cout<<"MK PDG = "<<PDG |
---|
| 697 | <<", while it is defined only for p,n,hyperons,anti-baryons,pi,K/antiK"<<G4endl; |
---|
| 698 | G4Exception("G4QuasiFreeRatio::FetchElTot:","22",FatalException,"CHIPScrash"); |
---|
| 699 | } |
---|
| 700 | |
---|
| 701 | // Each parameter set can have not more than nPoints = 128 parameters |
---|
| 702 | |
---|
| 703 | static const G4double lmi = 3.5; // min of (lnP-lmi)^2 parabola |
---|
| 704 | static const G4double pbe = .0557; // elastic (lnP-lmi)^2 parabola coefficient |
---|
| 705 | static const G4double pbt = .3; // total (lnP-lmi)^2 parabola coefficient |
---|
| 706 | static const G4double pmi = .1; // Below that fast LE calculation is made |
---|
| 707 | static const G4double pma = 1000.; // Above that fast HE calculation is made |
---|
| 708 | |
---|
| 709 | if( p <= 0.) |
---|
| 710 | { |
---|
| 711 | G4cout<<" p = "<<p<<" is zero or negative"<<G4endl; |
---|
| 712 | |
---|
| 713 | elasticXsc = 0.; |
---|
| 714 | inelasticXsc = 0.; |
---|
| 715 | totalXsc = 0.; |
---|
| 716 | |
---|
| 717 | return totalXsc; |
---|
| 718 | } |
---|
| 719 | if (!I) // pp/nn |
---|
| 720 | { |
---|
| 721 | if( p < pmi ) |
---|
| 722 | { |
---|
| 723 | G4double p2 = p*p; |
---|
| 724 | elasticXsc = 1./(.00012 + p2*.2); |
---|
| 725 | totalXsc = elasticXsc; |
---|
| 726 | } |
---|
| 727 | else if(p>pma) |
---|
| 728 | { |
---|
| 729 | G4double lp = std::log(p)-lmi; |
---|
| 730 | G4double lp2 = lp*lp; |
---|
| 731 | elasticXsc = pbe*lp2 + 6.72; |
---|
| 732 | totalXsc = pbt*lp2 + 38.2; |
---|
| 733 | } |
---|
| 734 | else |
---|
| 735 | { |
---|
| 736 | G4double p2 = p*p; |
---|
| 737 | G4double LE = 1./( .00012 + p2*.2); |
---|
| 738 | G4double lp = std::log(p) - lmi; |
---|
| 739 | G4double lp2 = lp*lp; |
---|
| 740 | G4double rp2 = 1./p2; |
---|
| 741 | elasticXsc = LE + ( pbe*lp2 + 6.72+32.6/p)/( 1. + rp2/p); |
---|
| 742 | totalXsc = LE + ( pbt*lp2 + 38.2+52.7*rp2)/( 1. + 2.72*rp2*rp2); |
---|
| 743 | } |
---|
| 744 | } |
---|
| 745 | else if( I==1 ) // np/pn |
---|
| 746 | { |
---|
| 747 | if( p < pmi ) |
---|
| 748 | { |
---|
| 749 | G4double p2 = p*p; |
---|
| 750 | elasticXsc = 1./( .00012 + p2*( .051 + .1*p2)); |
---|
| 751 | totalXsc = elasticXsc; |
---|
| 752 | } |
---|
| 753 | else if( p > pma ) |
---|
| 754 | { |
---|
| 755 | G4double lp = std::log(p) - lmi; |
---|
| 756 | G4double lp2 = lp*lp; |
---|
| 757 | elasticXsc = pbe*lp2 + 6.72; |
---|
| 758 | totalXsc = pbt*lp2 + 38.2; |
---|
| 759 | } |
---|
| 760 | else |
---|
| 761 | { |
---|
| 762 | G4double p2 = p*p; |
---|
| 763 | G4double LE = 1./( .00012 + p2*( .051 + .1*p2 ) ); |
---|
| 764 | G4double lp = std::log(p) - lmi; |
---|
| 765 | G4double lp2 = lp*lp; |
---|
| 766 | G4double rp2 = 1./p2; |
---|
| 767 | elasticXsc = LE + (pbe*lp2 + 6.72 + 30./p)/( 1. + .49*rp2/p); |
---|
| 768 | totalXsc = LE + (pbt*lp2 + 38.2)/( 1. + .54*rp2*rp2); |
---|
| 769 | } |
---|
| 770 | } |
---|
| 771 | else |
---|
| 772 | { |
---|
| 773 | G4cout<<"PDG incoding = "<<I<<" is not defined (0-1)"<<G4endl; |
---|
| 774 | |
---|
| 775 | } |
---|
| 776 | if( elasticXsc > totalXsc ) elasticXsc = totalXsc; |
---|
| 777 | |
---|
| 778 | totalXsc *= millibarn; |
---|
| 779 | elasticXsc *= millibarn; |
---|
| 780 | inelasticXsc = totalXsc - elasticXsc; |
---|
| 781 | if (inelasticXsc < 0.) inelasticXsc = 0.; |
---|
| 782 | |
---|
| 783 | return inelasticXsc; |
---|
| 784 | } |
---|
| 785 | |
---|
| 786 | //////////////////////////////////////////////////////////////////////////////////// |
---|
| 787 | // |
---|
| 788 | // |
---|
| 789 | |
---|
| 790 | G4double |
---|
| 791 | G4GGNuclNuclCrossSection::GetNucleusRadius( const G4DynamicParticle* , |
---|
| 792 | const G4Element* anElement) |
---|
| 793 | { |
---|
| 794 | G4double At = anElement->GetN(); |
---|
| 795 | G4double oneThird = 1.0/3.0; |
---|
| 796 | G4double cubicrAt = std::pow (At, oneThird); |
---|
| 797 | |
---|
| 798 | |
---|
| 799 | G4double R; // = fRadiusConst*cubicrAt; |
---|
| 800 | /* |
---|
| 801 | G4double tmp = std::pow( cubicrAt-1., 3.); |
---|
| 802 | tmp += At; |
---|
| 803 | tmp *= 0.5; |
---|
| 804 | |
---|
| 805 | if (At > 20.) // 20. |
---|
| 806 | { |
---|
| 807 | R = fRadiusConst*std::pow (tmp, oneThird); |
---|
| 808 | } |
---|
| 809 | else |
---|
| 810 | { |
---|
| 811 | R = fRadiusConst*cubicrAt; |
---|
| 812 | } |
---|
| 813 | */ |
---|
| 814 | |
---|
| 815 | R = fRadiusConst*cubicrAt; |
---|
| 816 | |
---|
| 817 | // return R; // !!!! |
---|
| 818 | |
---|
| 819 | |
---|
| 820 | |
---|
| 821 | G4double meanA = 21.; |
---|
| 822 | |
---|
| 823 | G4double tauA1 = 40.; |
---|
| 824 | G4double tauA2 = 10.; |
---|
| 825 | G4double tauA3 = 5.; |
---|
| 826 | |
---|
| 827 | G4double a1 = 0.85; |
---|
| 828 | G4double b1 = 1. - a1; |
---|
| 829 | |
---|
| 830 | G4double b2 = 0.3; |
---|
| 831 | G4double b3 = 4.; |
---|
| 832 | |
---|
| 833 | if (At > 20.) // 20. |
---|
| 834 | { |
---|
| 835 | R *= ( a1 + b1*std::exp( -(At - meanA)/tauA1) ); |
---|
| 836 | } |
---|
| 837 | else if (At > 3.5) |
---|
| 838 | { |
---|
| 839 | R *= ( 1.0 + b2*( 1. - std::exp( (At - meanA)/tauA2) ) ); |
---|
| 840 | } |
---|
| 841 | else |
---|
| 842 | { |
---|
| 843 | R *= ( 1.0 + b3*( 1. - std::exp( (At - meanA)/tauA3) ) ); |
---|
| 844 | } |
---|
| 845 | return R; |
---|
| 846 | |
---|
| 847 | } |
---|
| 848 | |
---|
| 849 | //////////////////////////////////////////////////////////////////////////////////// |
---|
| 850 | // |
---|
| 851 | // |
---|
| 852 | |
---|
| 853 | G4double |
---|
| 854 | G4GGNuclNuclCrossSection::GetNucleusRadius(G4double At) |
---|
| 855 | { |
---|
| 856 | G4double R; |
---|
| 857 | |
---|
| 858 | // R = GetNucleusRadiusGG(At); |
---|
| 859 | |
---|
| 860 | R = GetNucleusRadiusDE(At); |
---|
| 861 | |
---|
| 862 | return R; |
---|
| 863 | } |
---|
| 864 | |
---|
| 865 | /////////////////////////////////////////////////////////////////// |
---|
| 866 | |
---|
| 867 | G4double |
---|
| 868 | G4GGNuclNuclCrossSection::GetNucleusRadiusGG(G4double At) |
---|
| 869 | { |
---|
| 870 | |
---|
| 871 | G4double oneThird = 1.0/3.0; |
---|
| 872 | G4double cubicrAt = std::pow (At, oneThird); |
---|
| 873 | |
---|
| 874 | |
---|
| 875 | G4double R; // = fRadiusConst*cubicrAt; |
---|
| 876 | |
---|
| 877 | /* |
---|
| 878 | G4double tmp = std::pow( cubicrAt-1., 3.); |
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| 879 | tmp += At; |
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| 880 | tmp *= 0.5; |
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| 881 | |
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| 882 | if (At > 20.) |
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| 883 | { |
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| 884 | R = fRadiusConst*std::pow (tmp, oneThird); |
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| 885 | } |
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| 886 | else |
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| 887 | { |
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| 888 | R = fRadiusConst*cubicrAt; |
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| 889 | } |
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| 890 | */ |
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| 891 | |
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| 892 | R = fRadiusConst*cubicrAt; |
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| 893 | |
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| 894 | G4double meanA = 20.; |
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| 895 | G4double tauA = 20.; |
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| 896 | |
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| 897 | if ( At > 20.) // 20. |
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| 898 | { |
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| 899 | R *= ( 0.8 + 0.2*std::exp( -(At - meanA)/tauA) ); |
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| 900 | } |
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| 901 | else |
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| 902 | { |
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| 903 | R *= ( 1.0 + 0.1*( 1. - std::exp( (At - meanA)/tauA) ) ); |
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| 904 | } |
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| 905 | |
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| 906 | return R; |
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| 907 | |
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| 908 | } |
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| 909 | |
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| 910 | |
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| 911 | G4double |
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| 912 | G4GGNuclNuclCrossSection::GetNucleusRadiusDE(G4double A) |
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| 913 | { |
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| 914 | |
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| 915 | // algorithm from diffuse-elastic |
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| 916 | |
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| 917 | G4double R, r0, a11, a12, a13, a2, a3; |
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| 918 | |
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| 919 | a11 = 1.26; // 1.08, 1.16 |
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| 920 | a12 = 1.; // 1.08, 1.16 |
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| 921 | a13 = 1.12; // 1.08, 1.16 |
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| 922 | a2 = 1.1; |
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| 923 | a3 = 1.; |
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| 924 | |
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| 925 | |
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| 926 | if( A < 50. ) |
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| 927 | { |
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| 928 | if( 10 < A && A <= 15. ) r0 = a11*( 1 - std::pow(A, -2./3.) )*fermi; // 1.08*fermi; |
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| 929 | else if( 15 < A && A <= 20 ) r0 = a12*( 1 - std::pow(A, -2./3.) )*fermi; |
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| 930 | else if( 20 < A && A <= 30 ) r0 = a13*( 1 - std::pow(A, -2./3.) )*fermi; |
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| 931 | else r0 = a2*fermi; |
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| 932 | |
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| 933 | R = r0*std::pow( A, 1./3. ); |
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| 934 | } |
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| 935 | else |
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| 936 | { |
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| 937 | r0 = a3*fermi; |
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| 938 | |
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| 939 | R = r0*std::pow(A, 0.27); |
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| 940 | } |
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| 941 | return R; |
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| 942 | |
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| 943 | |
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| 944 | |
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| 945 | } |
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| 946 | |
---|
| 947 | |
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| 948 | |
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| 949 | |
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| 950 | |
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| 951 | |
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| 952 | //////////////////////////////////////////////////////////////////////////////////// |
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| 953 | // |
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| 954 | // |
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| 955 | |
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| 956 | G4double G4GGNuclNuclCrossSection::CalculateEcmValue( const G4double mp , |
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| 957 | const G4double mt , |
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| 958 | const G4double Plab ) |
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| 959 | { |
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| 960 | G4double Elab = std::sqrt ( mp * mp + Plab * Plab ); |
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| 961 | G4double Ecm = std::sqrt ( mp * mp + mt * mt + 2 * Elab * mt ); |
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| 962 | // G4double Pcm = Plab * mt / Ecm; |
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| 963 | // G4double KEcm = std::sqrt ( Pcm * Pcm + mp * mp ) - mp; |
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| 964 | |
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| 965 | return Ecm ; // KEcm; |
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| 966 | } |
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| 967 | |
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| 968 | |
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| 969 | //////////////////////////////////////////////////////////////////////////////////// |
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| 970 | // |
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| 971 | // |
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| 972 | |
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| 973 | G4double G4GGNuclNuclCrossSection::CalcMandelstamS( const G4double mp , |
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| 974 | const G4double mt , |
---|
| 975 | const G4double Plab ) |
---|
| 976 | { |
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| 977 | G4double Elab = std::sqrt ( mp * mp + Plab * Plab ); |
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| 978 | G4double sMand = mp*mp + mt*mt + 2*Elab*mt ; |
---|
| 979 | |
---|
| 980 | return sMand; |
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| 981 | } |
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| 982 | |
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| 983 | |
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| 984 | // |
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| 985 | // |
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| 986 | /////////////////////////////////////////////////////////////////////////////////////// |
---|