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24 | // ******************************************************************** |
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25 | // |
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26 | // |
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27 | // $Id: G4QuasiElasticChannel.cc,v 1.1.2.2 2008/04/24 13:44:10 gcosmo Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-01-patch-02 $ |
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29 | // |
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30 | |
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31 | // Author : Gunter Folger March 2007 |
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32 | // Class Description |
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33 | // Final state production model for theoretical models of hadron inelastic |
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34 | // quasi elastic scattering in geant4; |
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35 | // Class Description - End |
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36 | // |
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37 | // Modified: |
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38 | |
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39 | #include "G4QuasiElasticChannel.hh" |
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40 | |
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41 | #include "G4Fancy3DNucleus.hh" |
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42 | |
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43 | |
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44 | #include "G4HadTmpUtil.hh" //lrint |
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45 | |
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46 | //#define debug_scatter |
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47 | |
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48 | G4QuasiElasticChannel::G4QuasiElasticChannel() |
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49 | { |
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50 | theQuasiElastic=G4QuasiFreeRatios::GetPointer(); |
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51 | } |
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52 | |
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53 | G4QuasiElasticChannel::~G4QuasiElasticChannel() |
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54 | {} |
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55 | |
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56 | G4double G4QuasiElasticChannel::GetFraction(G4Nucleus &theNucleus, |
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57 | const G4DynamicParticle & thePrimary) |
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58 | { |
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59 | std::pair<G4double,G4double> ratios; |
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60 | ratios=theQuasiElastic->GetRatios(thePrimary.GetTotalMomentum(), |
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61 | thePrimary.GetDefinition()->GetPDGEncoding(), |
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62 | G4lrint(theNucleus.GetZ()), |
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63 | G4lrint(theNucleus.GetN()-theNucleus.GetZ())); |
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64 | #ifdef debug_getFraction |
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65 | G4cout << "G4QuasiElasticChannel::ratios " << ratios.first << " x " <<ratios.second |
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66 | << " = " << ratios.first*ratios.second << G4endl; |
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67 | #endif |
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68 | |
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69 | return ratios.first*ratios.second; |
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70 | } |
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71 | |
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72 | G4KineticTrackVector * G4QuasiElasticChannel::Scatter(G4Nucleus &theNucleus, |
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73 | const G4DynamicParticle & thePrimary) |
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74 | { |
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75 | |
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76 | |
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77 | G4int A=G4lrint(theNucleus.GetN()); |
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78 | // G4int Z=G4lrint(theNucleus.GetZ()); |
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79 | // build Nucleus and choose random nucleon to scatter with |
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80 | the3DNucleus.Init(theNucleus.GetN(),theNucleus.GetZ()); |
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81 | const std::vector<G4Nucleon *> nucleons=the3DNucleus.GetNucleons(); |
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82 | |
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83 | G4int index; |
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84 | do { |
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85 | index=G4lrint((A-1)*G4UniformRand()); |
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86 | |
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87 | } while (index < 0 || index >= static_cast<G4int>(nucleons.size())); |
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88 | |
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89 | // G4double an=G4UniformRand()*A; |
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90 | G4ParticleDefinition * pDef= nucleons[index]->GetDefinition(); |
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91 | |
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92 | #ifdef debug_scatter |
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93 | G4cout << " neutron - proton? A, Z, an, pdg" <<" " |
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94 | << A <<" "<<G4lrint(theNucleus.GetZ()) |
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95 | << " "<<an <<" " << pDef->GetParticleName()<< G4endl; |
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96 | #endif |
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97 | // G4LorentzVector pNucleon(G4ThreeVector(0,0,0),pDef->GetPDGMass()); |
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98 | G4LorentzVector pNucleon=nucleons[index]->Get4Momentum(); |
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99 | |
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100 | std::pair<G4LorentzVector,G4LorentzVector> result; |
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101 | |
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102 | result=theQuasiElastic->Scatter(pDef->GetPDGEncoding(),pNucleon, |
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103 | thePrimary.GetDefinition()->GetPDGEncoding(), |
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104 | thePrimary.Get4Momentum()); |
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105 | |
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106 | if (result.first.e() == 0.) |
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107 | { |
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108 | G4cout << "Warning - G4QuasiElasticChannel::Scatter no scattering" << G4endl; |
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109 | return 0; //no scatter |
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110 | } |
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111 | |
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112 | #ifdef debug_scatter |
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113 | G4LorentzVector EpConservation=pNucleon+thePrimary.Get4Momentum() |
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114 | - result.first - result.second; |
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115 | if ( (EpConservation.vect().mag2() > 0.01*MeV*MeV ) |
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116 | || (std::abs(EpConservation.e()) > 0.1 * MeV ) ) |
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117 | { |
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118 | G4cout << "Warning - G4QuasiElasticChannel::Scatter E-p non conservation : " |
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119 | << EpConservation << G4endl; |
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120 | } |
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121 | #endif |
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122 | |
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123 | G4KineticTrackVector * ktv; |
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124 | ktv=new G4KineticTrackVector(); |
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125 | G4KineticTrack * sPrim=new G4KineticTrack(thePrimary.GetDefinition(), |
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126 | 0.,G4ThreeVector(0), result.second); |
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127 | ktv->push_back(sPrim); |
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128 | G4KineticTrack * sNuc=new G4KineticTrack(pDef, |
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129 | 0.,G4ThreeVector(0), result.first); |
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130 | ktv->push_back(sNuc); |
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131 | |
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132 | #ifdef debug_scatter |
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133 | G4cout << " scattered Nucleon : " << result.first << " mass " <<result.first.mag() << G4endl; |
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134 | G4cout << " scattered Project : " << result.second << " mass " <<result.second.mag() << G4endl; |
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135 | #endif |
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136 | return ktv; |
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137 | } |
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