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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