| 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 | // 18-Sep-2003 First version is written by T. Koi |
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| 27 | // 23-Dec-2006 Isotope dependence added by D. Wright |
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| 28 | // |
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| 29 | |
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| 30 | #include "G4IonsSihverCrossSection.hh" |
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| 31 | #include "G4ParticleTable.hh" |
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| 32 | #include "G4IonTable.hh" |
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| 33 | |
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| 34 | G4double G4IonsSihverCrossSection:: |
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| 35 | GetIsoZACrossSection(const G4DynamicParticle* aParticle, G4double /*ZZ*/, |
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| 36 | G4double AA, G4double /*aTemperature*/) |
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| 37 | { |
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| 38 | G4double xsection = 0.0; |
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| 39 | |
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| 40 | G4int At = G4int(AA); |
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| 41 | //G4int Zt = G4int(ZZ); // not used |
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| 42 | |
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| 43 | G4int Ap = aParticle->GetDefinition()->GetBaryonNumber(); |
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| 44 | //Zp = aParticle->GetDefinition()->GetPDGCharge(); // not used |
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| 45 | |
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| 46 | G4double one_third = 1.0 / 3.0; |
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| 47 | |
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| 48 | G4double cubicrAt = std::pow ( G4double(At) , G4double(one_third) ); |
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| 49 | G4double cubicrAp = std::pow ( G4double(Ap) , G4double(one_third) ); |
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| 50 | |
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| 51 | G4double b0 = 1.581 - 0.876 * ( 1.0 / cubicrAp + 1.0 / cubicrAt ); |
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| 52 | |
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| 53 | xsection = pi * square_r0 |
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| 54 | * std::pow ( G4double(cubicrAp + cubicrAt - b0 * ( 1.0 / cubicrAp + 1.0 / cubicrAt ) ), G4double(2) ); |
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| 55 | |
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| 56 | return xsection; |
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| 57 | } |
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| 58 | |
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| 59 | |
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| 60 | G4double G4IonsSihverCrossSection:: |
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| 61 | GetCrossSection(const G4DynamicParticle* aParticle, |
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| 62 | const G4Element* anElement, G4double temperature) |
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| 63 | { |
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| 64 | G4int nIso = anElement->GetNumberOfIsotopes(); |
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| 65 | G4double xsection = 0; |
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| 66 | |
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| 67 | if (nIso) { |
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| 68 | G4double sig; |
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| 69 | G4IsotopeVector* isoVector = anElement->GetIsotopeVector(); |
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| 70 | G4double* abundVector = anElement->GetRelativeAbundanceVector(); |
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| 71 | G4double ZZ; |
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| 72 | G4double AA; |
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| 73 | |
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| 74 | for (G4int i = 0; i < nIso; i++) { |
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| 75 | ZZ = G4double( (*isoVector)[i]->GetZ() ); |
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| 76 | AA = G4double( (*isoVector)[i]->GetN() ); |
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| 77 | sig = GetIsoZACrossSection(aParticle, ZZ, AA, temperature); |
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| 78 | xsection += sig*abundVector[i]; |
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| 79 | } |
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| 80 | |
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| 81 | } else { |
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| 82 | xsection = |
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| 83 | GetIsoZACrossSection(aParticle, anElement->GetZ(), anElement->GetN(), |
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| 84 | temperature); |
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| 85 | } |
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| 86 | |
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| 87 | return xsection; |
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| 88 | } |
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