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24 | // ******************************************************************** |
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25 | // |
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26 | // neutron_hp -- source file |
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27 | // J.P. Wellisch, Nov-1996 |
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28 | // A prototype of the low energy neutron transport model. |
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29 | // |
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30 | // 25-08-06 New Final State type (refFlag==3 , Legendre (Low Energy) + Probability (High Energy) ) |
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31 | // is added by T. KOI |
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32 | // |
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33 | #include "G4NeutronHPElasticFS.hh" |
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34 | #include "G4ReactionProduct.hh" |
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35 | #include "G4Nucleus.hh" |
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36 | #include "G4Proton.hh" |
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37 | #include "G4Deuteron.hh" |
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38 | #include "G4Triton.hh" |
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39 | #include "G4Alpha.hh" |
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40 | #include "G4ThreeVector.hh" |
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41 | #include "G4LorentzVector.hh" |
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42 | #include "G4ParticleTable.hh" |
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43 | #include "G4NeutronHPDataUsed.hh" |
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44 | |
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45 | void G4NeutronHPElasticFS::Init (G4double A, G4double Z, G4String & dirName, G4String & ) |
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46 | { |
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47 | G4String tString = "/FS/"; |
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48 | G4bool dbool; |
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49 | G4NeutronHPDataUsed aFile = theNames.GetName(static_cast<G4int>(A), static_cast<G4int>(Z), dirName, tString, dbool); |
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50 | G4String filename = aFile.GetName(); |
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51 | theBaseA = aFile.GetA(); |
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52 | theBaseZ = aFile.GetZ(); |
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53 | if(!dbool) |
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54 | { |
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55 | hasAnyData = false; |
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56 | hasFSData = false; |
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57 | hasXsec = false; |
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58 | return; |
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59 | } |
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60 | std::ifstream theData(filename, std::ios::in); |
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61 | theData >> repFlag >> targetMass >> frameFlag; |
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62 | if(repFlag==1) |
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63 | { |
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64 | G4int nEnergy; |
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65 | theData >> nEnergy; |
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66 | theCoefficients = new G4NeutronHPLegendreStore(nEnergy); |
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67 | theCoefficients->InitInterpolation(theData); |
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68 | G4double temp, energy; |
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69 | G4int tempdep, nLegendre; |
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70 | G4int i, ii; |
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71 | for (i=0; i<nEnergy; i++) |
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72 | { |
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73 | theData >> temp >> energy >> tempdep >> nLegendre; |
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74 | energy *=eV; |
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75 | theCoefficients->Init(i, energy, nLegendre); |
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76 | theCoefficients->SetTemperature(i, temp); |
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77 | G4double coeff=0; |
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78 | for(ii=0; ii<nLegendre; ii++) |
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79 | { |
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80 | // load legendre coefficients. |
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81 | theData >> coeff; |
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82 | theCoefficients->SetCoeff(i, ii+1, coeff); // @@@HPW@@@ |
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83 | } |
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84 | } |
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85 | } |
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86 | else if (repFlag==2) |
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87 | { |
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88 | G4int nEnergy; |
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89 | theData >> nEnergy; |
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90 | theProbArray = new G4NeutronHPPartial(nEnergy, nEnergy); |
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91 | theProbArray->InitInterpolation(theData); |
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92 | G4double temp, energy; |
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93 | G4int tempdep, nPoints; |
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94 | for(G4int i=0; i<nEnergy; i++) |
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95 | { |
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96 | theData >> temp >> energy >> tempdep >> nPoints; |
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97 | energy *= eV; |
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98 | theProbArray->InitInterpolation(i, theData); |
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99 | theProbArray->SetT(i, temp); |
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100 | theProbArray->SetX(i, energy); |
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101 | G4double prob, costh; |
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102 | for(G4int ii=0; ii<nPoints; ii++) |
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103 | { |
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104 | // fill probability arrays. |
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105 | theData >> costh >> prob; |
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106 | theProbArray->SetX(i, ii, costh); |
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107 | theProbArray->SetY(i, ii, prob); |
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108 | } |
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109 | } |
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110 | } |
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111 | else if ( repFlag==3 ) |
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112 | { |
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113 | G4int nEnergy_Legendre; |
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114 | theData >> nEnergy_Legendre; |
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115 | theCoefficients = new G4NeutronHPLegendreStore( nEnergy_Legendre ); |
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116 | theCoefficients->InitInterpolation( theData ); |
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117 | G4double temp, energy; |
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118 | G4int tempdep, nLegendre; |
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119 | G4int i, ii; |
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120 | for ( i = 0 ; i < nEnergy_Legendre ; i++ ) |
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121 | { |
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122 | theData >> temp >> energy >> tempdep >> nLegendre; |
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123 | energy *=eV; |
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124 | theCoefficients->Init( i , energy , nLegendre ); |
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125 | theCoefficients->SetTemperature( i , temp ); |
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126 | G4double coeff = 0; |
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127 | for ( ii = 0 ; ii < nLegendre ; ii++ ) |
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128 | { |
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129 | // load legendre coefficients. |
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130 | theData >> coeff; |
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131 | theCoefficients->SetCoeff(i, ii+1, coeff); // @@@HPW@@@ |
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132 | } |
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133 | } |
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134 | |
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135 | tE_of_repFlag3 = energy; |
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136 | |
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137 | G4int nEnergy_Prob; |
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138 | theData >> nEnergy_Prob; |
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139 | theProbArray = new G4NeutronHPPartial( nEnergy_Prob , nEnergy_Prob ); |
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140 | theProbArray->InitInterpolation( theData ); |
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141 | G4int nPoints; |
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142 | for ( G4int i=0 ; i < nEnergy_Prob ; i++ ) |
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143 | { |
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144 | theData >> temp >> energy >> tempdep >> nPoints; |
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145 | |
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146 | energy *= eV; |
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147 | |
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148 | // consistensy check |
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149 | if ( i == 0 ) |
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150 | if ( energy != tE_of_repFlag3 ) |
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151 | G4cout << "Warning Trangition Energy of repFlag3 is not consistent." << G4endl; |
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152 | |
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153 | theProbArray->InitInterpolation( i , theData ); |
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154 | theProbArray->SetT( i , temp ); |
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155 | theProbArray->SetX( i , energy ); |
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156 | G4double prob, costh; |
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157 | for( G4int ii = 0 ; ii < nPoints ; ii++ ) |
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158 | { |
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159 | // fill probability arrays. |
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160 | theData >> costh >> prob; |
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161 | theProbArray->SetX( i , ii , costh ); |
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162 | theProbArray->SetY( i , ii , prob ); |
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163 | } |
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164 | } |
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165 | } |
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166 | else if (repFlag==0) |
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167 | { |
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168 | theData >> frameFlag; |
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169 | } |
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170 | else |
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171 | { |
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172 | G4cout << "unusable number for repFlag: repFlag="<<repFlag<<G4endl; |
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173 | throw G4HadronicException(__FILE__, __LINE__, "G4NeutronHPElasticFS::Init -- unusable number for repFlag"); |
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174 | } |
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175 | theData.close(); |
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176 | } |
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177 | G4HadFinalState * G4NeutronHPElasticFS::ApplyYourself(const G4HadProjectile & theTrack) |
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178 | { |
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179 | // G4cout << "G4NeutronHPElasticFS::ApplyYourself+"<<G4endl; |
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180 | theResult.Clear(); |
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181 | G4double eKinetic = theTrack.GetKineticEnergy(); |
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182 | const G4HadProjectile *incidentParticle = &theTrack; |
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183 | G4ReactionProduct theNeutron( const_cast<G4ParticleDefinition *>(incidentParticle->GetDefinition()) ); |
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184 | theNeutron.SetMomentum( incidentParticle->Get4Momentum().vect() ); |
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185 | theNeutron.SetKineticEnergy( eKinetic ); |
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186 | // G4cout << "G4NeutronHPElasticFS::ApplyYourself++"<<eKinetic<<" "<<G4endl; |
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187 | // G4cout << "CMSVALUES 0 "<<theNeutron.GetTotalMomentum()<<G4endl; |
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188 | |
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189 | G4ReactionProduct theTarget; |
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190 | G4Nucleus aNucleus; |
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191 | G4ThreeVector neuVelo = (1./incidentParticle->GetDefinition()->GetPDGMass())*theNeutron.GetMomentum(); |
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192 | theTarget = aNucleus.GetBiasedThermalNucleus( targetMass, neuVelo, theTrack.GetMaterial()->GetTemperature()); |
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193 | // G4cout << "Nucleus-test"<<" "<<targetMass<<" "; |
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194 | // G4cout << theTarget.GetMomentum().x()<<" "; |
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195 | // G4cout << theTarget.GetMomentum().y()<<" "; |
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196 | // G4cout << theTarget.GetMomentum().z()<<G4endl; |
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197 | |
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198 | // neutron and target defined as reaction products. |
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199 | |
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200 | // prepare lorentz-transformation to Lab. |
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201 | |
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202 | G4ThreeVector the3Neutron = theNeutron.GetMomentum(); |
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203 | G4double nEnergy = theNeutron.GetTotalEnergy(); |
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204 | G4ThreeVector the3Target = theTarget.GetMomentum(); |
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205 | // cout << "@@@" << the3Target<<G4endl; |
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206 | G4double tEnergy = theTarget.GetTotalEnergy(); |
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207 | G4ReactionProduct theCMS; |
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208 | G4double totE = nEnergy+tEnergy; |
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209 | G4ThreeVector the3CMS = the3Target+the3Neutron; |
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210 | theCMS.SetMomentum(the3CMS); |
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211 | G4double cmsMom = std::sqrt(the3CMS*the3CMS); |
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212 | G4double sqrts = std::sqrt((totE-cmsMom)*(totE+cmsMom)); |
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213 | theCMS.SetMass(sqrts); |
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214 | theCMS.SetTotalEnergy(totE); |
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215 | |
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216 | // data come as fcn of n-energy in nuclear rest frame |
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217 | G4ReactionProduct boosted; |
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218 | boosted.Lorentz(theNeutron, theTarget); |
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219 | eKinetic = boosted.GetKineticEnergy(); // get kinetic energy for scattering |
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220 | G4double cosTh = -2; |
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221 | if(repFlag == 1) |
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222 | { |
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223 | cosTh = theCoefficients->SampleElastic(eKinetic); |
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224 | } |
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225 | |
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226 | else if (repFlag==2) |
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227 | { |
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228 | cosTh = theProbArray->Sample(eKinetic); |
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229 | } |
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230 | else if (repFlag==3) |
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231 | { |
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232 | if ( eKinetic <= tE_of_repFlag3 ) |
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233 | { |
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234 | cosTh = theCoefficients->SampleElastic(eKinetic); |
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235 | } |
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236 | else |
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237 | { |
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238 | cosTh = theProbArray->Sample(eKinetic); |
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239 | } |
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240 | } |
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241 | else if (repFlag==0) |
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242 | { |
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243 | cosTh = 2.*G4UniformRand()-1.; |
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244 | } |
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245 | else |
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246 | { |
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247 | G4cout << "unusable number for repFlag: repFlag="<<repFlag<<G4endl; |
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248 | throw G4HadronicException(__FILE__, __LINE__, "G4NeutronHPElasticFS::Init -- unusable number for repFlag"); |
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249 | } |
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250 | if(cosTh<-1.1) { return 0; } |
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251 | G4double phi = twopi*G4UniformRand(); |
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252 | G4double theta = std::acos(cosTh); |
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253 | G4double sinth = std::sin(theta); |
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254 | if (frameFlag == 1) // final state data given in target rest frame. |
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255 | { |
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256 | // we have the scattering angle, now we need the energy, then do the |
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257 | // boosting. |
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258 | // relativistic elastic scattering energy angular correlation: |
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259 | theNeutron.Lorentz(theNeutron, theTarget); |
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260 | G4double e0 = theNeutron.GetTotalEnergy(); |
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261 | G4double p0 = theNeutron.GetTotalMomentum(); |
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262 | G4double mN = theNeutron.GetMass(); |
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263 | G4double mT = theTarget.GetMass(); |
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264 | G4double eE = e0+mT; |
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265 | G4double ap = (mT+eE)*(mT-eE) + (p0+mN)*(p0-mN); |
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266 | G4double a = 4*(eE+p0*cosTh)*(eE-p0*cosTh); |
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267 | G4double b = 4*ap*p0*cosTh; |
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268 | G4double c = (2.*eE*mN-ap)*(2.*eE*mN+ap); |
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269 | G4double en = (-b+std::sqrt(b*b - 4*a*c) )/(2*a); |
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270 | G4ThreeVector tempVector(en*sinth*std::cos(phi), en*sinth*std::sin(phi), en*std::cos(theta) ); |
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271 | theNeutron.SetMomentum(tempVector); |
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272 | theNeutron.SetTotalEnergy(std::sqrt(en*en+theNeutron.GetMass()*theNeutron.GetMass())); |
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273 | // first to lab |
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274 | theNeutron.Lorentz(theNeutron, -1.*theTarget); |
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275 | // now to CMS |
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276 | theNeutron.Lorentz(theNeutron, theCMS); |
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277 | theTarget.SetMomentum(-theNeutron.GetMomentum()); |
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278 | theTarget.SetTotalEnergy(theNeutron.GetTotalEnergy()); |
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279 | // and back to lab |
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280 | theNeutron.Lorentz(theNeutron, -1.*theCMS); |
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281 | theTarget.Lorentz(theTarget, -1.*theCMS); |
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282 | } |
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283 | else if (frameFlag == 2) // CMS |
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284 | { |
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285 | theNeutron.Lorentz(theNeutron, theCMS); |
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286 | theTarget.Lorentz(theTarget, theCMS); |
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287 | G4double en = theNeutron.GetTotalMomentum(); // already in CMS. |
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288 | G4ThreeVector cmsMom=theNeutron.GetMomentum(); // for neutron direction in CMS |
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289 | G4double cms_theta=cmsMom.theta(); |
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290 | G4double cms_phi=cmsMom.phi(); |
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291 | G4ThreeVector tempVector; |
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292 | tempVector.setX(std::cos(theta)*std::sin(cms_theta)*std::cos(cms_phi) |
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293 | +std::sin(theta)*std::cos(phi)*std::cos(cms_theta)*std::cos(cms_phi) |
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294 | -std::sin(theta)*std::sin(phi)*std::sin(cms_phi) ); |
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295 | tempVector.setY(std::cos(theta)*std::sin(cms_theta)*std::sin(cms_phi) |
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296 | +std::sin(theta)*std::cos(phi)*std::cos(cms_theta)*std::sin(cms_phi) |
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297 | +std::sin(theta)*std::sin(phi)*std::cos(cms_phi) ); |
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298 | tempVector.setZ(std::cos(theta)*std::cos(cms_theta) |
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299 | -std::sin(theta)*std::cos(phi)*std::sin(cms_theta) ); |
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300 | tempVector *= en; |
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301 | theNeutron.SetMomentum(tempVector); |
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302 | theTarget.SetMomentum(-tempVector); |
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303 | G4double tP = theTarget.GetTotalMomentum(); |
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304 | G4double tM = theTarget.GetMass(); |
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305 | theTarget.SetTotalEnergy(std::sqrt((tP+tM)*(tP+tM)-2.*tP*tM)); |
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306 | theNeutron.Lorentz(theNeutron, -1.*theCMS); |
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307 | theTarget.Lorentz(theTarget, -1.*theCMS); |
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308 | } |
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309 | else |
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310 | { |
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311 | G4cout <<"Value of frameFlag (1=LAB, 2=CMS): "<<frameFlag; |
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312 | throw G4HadronicException(__FILE__, __LINE__, "G4NeutronHPElasticFS::ApplyYourSelf frameflag incorrect"); |
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313 | } |
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314 | // now all in Lab |
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315 | // nun den recoil generieren...und energy change, momentum change angeben. |
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316 | theResult.SetEnergyChange(theNeutron.GetKineticEnergy()); |
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317 | theResult.SetMomentumChange(theNeutron.GetMomentum().unit()); |
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318 | G4DynamicParticle* theRecoil = new G4DynamicParticle; |
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319 | if(targetMass<4.5) |
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320 | { |
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321 | if(targetMass<1) |
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322 | { |
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323 | // proton |
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324 | theRecoil->SetDefinition(G4Proton::Proton()); |
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325 | } |
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326 | else if(targetMass<2 ) |
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327 | { |
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328 | // deuteron |
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329 | theRecoil->SetDefinition(G4Deuteron::Deuteron()); |
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330 | } |
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331 | else if(targetMass<2.999 ) |
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332 | { |
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333 | // 3He |
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334 | theRecoil->SetDefinition(G4He3::He3()); |
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335 | } |
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336 | else if(targetMass<3 ) |
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337 | { |
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338 | // Triton |
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339 | theRecoil->SetDefinition(G4Triton::Triton()); |
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340 | } |
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341 | else |
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342 | { |
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343 | // alpha |
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344 | theRecoil->SetDefinition(G4Alpha::Alpha()); |
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345 | } |
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346 | } |
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347 | else |
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348 | { |
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349 | theRecoil->SetDefinition(G4ParticleTable::GetParticleTable() |
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350 | ->FindIon(static_cast<G4int>(theBaseZ), static_cast<G4int>(theBaseA), 0, static_cast<G4int>(theBaseZ))); |
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351 | } |
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352 | theRecoil->SetMomentum(theTarget.GetMomentum()); |
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353 | theResult.AddSecondary(theRecoil); |
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354 | // G4cout << "G4NeutronHPElasticFS::ApplyYourself 10+"<<G4endl; |
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355 | // postpone the tracking of the primary neutron |
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356 | theResult.SetStatusChange(suspend); |
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357 | return &theResult; |
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358 | } |
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