1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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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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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 | // 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 | #include "G4NeutronHPLabAngularEnergy.hh" |
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31 | #include "G4Gamma.hh" |
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32 | #include "G4Electron.hh" |
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33 | #include "G4Positron.hh" |
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34 | #include "G4Neutron.hh" |
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35 | #include "G4Proton.hh" |
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36 | #include "G4Deuteron.hh" |
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37 | #include "G4Triton.hh" |
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38 | #include "G4He3.hh" |
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39 | #include "G4Alpha.hh" |
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40 | #include "Randomize.hh" |
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41 | |
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42 | void G4NeutronHPLabAngularEnergy::Init(std::ifstream & aDataFile) |
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43 | { |
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44 | aDataFile >> nEnergies; |
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45 | theManager.Init(aDataFile); |
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46 | theEnergies = new G4double[nEnergies]; |
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47 | nCosTh = new G4int[nEnergies]; |
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48 | theData = new G4NeutronHPVector * [nEnergies]; |
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49 | theSecondManager = new G4InterpolationManager [nEnergies]; |
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50 | for(G4int i=0; i<nEnergies; i++) |
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51 | { |
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52 | aDataFile >> theEnergies[i]; |
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53 | theEnergies[i]*=eV; |
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54 | aDataFile >> nCosTh[i]; |
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55 | theSecondManager[i].Init(aDataFile); |
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56 | theData[i] = new G4NeutronHPVector[nCosTh[i]]; |
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57 | G4double label; |
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58 | for(G4int ii=0; ii<nCosTh[i]; ii++) |
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59 | { |
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60 | aDataFile >> label; |
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61 | theData[i][ii].SetLabel(label); |
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62 | theData[i][ii].Init(aDataFile, eV); |
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63 | } |
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64 | } |
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65 | } |
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66 | |
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67 | G4ReactionProduct * G4NeutronHPLabAngularEnergy::Sample(G4double anEnergy, G4double massCode, G4double ) |
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68 | { |
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69 | G4ReactionProduct * result = new G4ReactionProduct; |
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70 | G4int Z = static_cast<G4int>(massCode/1000); |
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71 | G4int A = static_cast<G4int>(massCode-1000*Z); |
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72 | |
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73 | if(massCode==0) |
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74 | { |
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75 | result->SetDefinition(G4Gamma::Gamma()); |
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76 | } |
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77 | else if(A==0) |
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78 | { |
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79 | result->SetDefinition(G4Electron::Electron()); |
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80 | if(Z==1) result->SetDefinition(G4Positron::Positron()); |
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81 | } |
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82 | else if(A==1) |
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83 | { |
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84 | result->SetDefinition(G4Neutron::Neutron()); |
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85 | if(Z==1) result->SetDefinition(G4Proton::Proton()); |
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86 | } |
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87 | else if(A==2) |
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88 | { |
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89 | result->SetDefinition(G4Deuteron::Deuteron()); |
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90 | } |
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91 | else if(A==3) |
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92 | { |
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93 | result->SetDefinition(G4Triton::Triton()); |
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94 | if(Z==2) result->SetDefinition(G4He3::He3()); |
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95 | } |
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96 | else if(A==4) |
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97 | { |
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98 | result->SetDefinition(G4Alpha::Alpha()); |
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99 | if(Z!=2) throw G4HadronicException(__FILE__, __LINE__, "Unknown ion case 1"); |
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100 | } |
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101 | else |
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102 | { |
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103 | throw G4HadronicException(__FILE__, __LINE__, "G4NeutronHPLabAngularEnergy: Unknown ion case 2"); |
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104 | } |
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105 | |
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106 | // get theta, E |
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107 | G4double cosTh, secEnergy; |
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108 | G4int i, it(0); |
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109 | // find the energy bin |
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110 | for(i=0; i<nEnergies; i++) |
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111 | { |
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112 | it = i; |
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113 | if(anEnergy<theEnergies[i]) break; |
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114 | } |
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115 | if(it==0 || it == nEnergies-1) // it marks the energy bin |
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116 | { |
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117 | // integrate the prob for each costh, and select theta. |
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118 | G4double * running = new G4double [nCosTh[it]]; |
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119 | running[0]=0; |
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120 | for(i=0;i<nCosTh[it]; i++) |
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121 | { |
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122 | if(i!=0) running[i] = running[i-1]; |
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123 | running[i]+=theData[it][i].GetIntegral(); // Does interpolated integral. |
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124 | } |
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125 | G4double random = running[nCosTh[it]-1]*G4UniformRand(); |
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126 | G4int ith(0); |
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127 | for(i=0;i<nCosTh[it]; i++) |
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128 | { |
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129 | ith = i; |
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130 | if(random<running[i]) break; |
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131 | } |
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132 | if(ith==0 || ith==nCosTh[it]-1) |
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133 | { |
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134 | cosTh = theData[it][ith].GetLabel(); |
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135 | secEnergy = theData[it][ith].Sample(); |
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136 | currentMeanEnergy = theData[it][ith].GetMeanX(); |
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137 | } |
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138 | else |
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139 | { |
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140 | G4double x1 = theData[it][ith-1].GetIntegral(); |
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141 | G4double x2 = theData[it][ith].GetIntegral(); |
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142 | G4double x = random; |
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143 | G4double y1 = theData[it][ith-1].GetLabel(); |
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144 | G4double y2 = theData[it][ith].GetLabel(); |
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145 | cosTh = theInt.Interpolate(theSecondManager[it].GetInverseScheme(ith), |
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146 | x, x1, x2, y1, y2); |
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147 | G4NeutronHPVector theBuff1; |
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148 | theBuff1.SetInterpolationManager(theData[it][ith-1].GetInterpolationManager()); |
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149 | G4NeutronHPVector theBuff2; |
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150 | theBuff2.SetInterpolationManager(theData[it][ith].GetInterpolationManager()); |
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151 | x1=y1; |
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152 | x2=y2; |
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153 | G4double y, mu; |
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154 | for(i=0;i<theData[it][ith-1].GetVectorLength(); i++) |
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155 | { |
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156 | mu = theData[it][ith-1].GetX(i); |
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157 | y1 = theData[it][ith-1].GetY(i); |
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158 | y2 = theData[it][ith].GetY(mu); |
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159 | y = theInt.Interpolate(theSecondManager[it].GetScheme(ith), |
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160 | cosTh, x1,x2,y1,y2); |
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161 | theBuff1.SetData(i, mu, y); |
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162 | } |
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163 | for(i=0;i<theData[it][ith].GetVectorLength(); i++) |
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164 | { |
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165 | mu = theData[it][ith].GetX(i); |
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166 | y1 = theData[it][ith-1].GetY(mu); |
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167 | y2 = theData[it][ith].GetY(i); |
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168 | y = theInt.Interpolate(theSecondManager[it].GetScheme(ith), |
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169 | cosTh, x1,x2,y1,y2); |
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170 | theBuff2.SetData(i, mu, y); |
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171 | } |
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172 | G4NeutronHPVector theStore; |
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173 | theStore.Merge(&theBuff1, &theBuff2); |
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174 | secEnergy = theStore.Sample(); |
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175 | currentMeanEnergy = theStore.GetMeanX(); |
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176 | } |
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177 | delete [] running; |
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178 | } |
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179 | else // this is the small big else. |
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180 | { |
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181 | G4double x, x1, x2, y1, y2, y, tmp, E; |
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182 | // integrate the prob for each costh, and select theta. |
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183 | G4NeutronHPVector run1; |
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184 | run1.SetY(0, 0.); |
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185 | for(i=0;i<nCosTh[it-1]; i++) |
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186 | { |
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187 | if(i!=0) run1.SetY(i, run1.GetY(i-1)); |
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188 | run1.SetX(i, theData[it-1][i].GetLabel()); |
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189 | run1.SetY(i, run1.GetY(i)+theData[it-1][i].GetIntegral()); |
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190 | } |
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191 | G4NeutronHPVector run2; |
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192 | run2.SetY(0, 0.); |
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193 | for(i=0;i<nCosTh[it]; i++) |
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194 | { |
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195 | if(i!=0) run2.SetY(i, run2.GetY(i-1)); |
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196 | run2.SetX(i, theData[it][i].GetLabel()); |
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197 | run2.SetY(i, run2.GetY(i)+theData[it][i].GetIntegral()); |
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198 | } |
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199 | // get the distributions for the correct neutron energy |
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200 | x = anEnergy; |
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201 | x1 = theEnergies[it-1]; |
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202 | x2 = theEnergies[it]; |
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203 | G4NeutronHPVector thBuff1; // to be interpolated as run1. |
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204 | thBuff1.SetInterpolationManager(theSecondManager[it-1]); |
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205 | for(i=0; i<run1.GetVectorLength(); i++) |
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206 | { |
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207 | tmp = run1.GetX(i); //theta |
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208 | y1 = run1.GetY(i); // integral |
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209 | y2 = run2.GetY(tmp); |
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210 | y = theInt.Interpolate(theManager.GetScheme(it), x, x1,x2,y1,y2); |
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211 | thBuff1.SetData(i, tmp, y); |
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212 | } |
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213 | G4NeutronHPVector thBuff2; |
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214 | thBuff2.SetInterpolationManager(theSecondManager[it]); |
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215 | for(i=0; i<run2.GetVectorLength(); i++) |
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216 | { |
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217 | tmp = run2.GetX(i); //theta |
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218 | y1 = run1.GetY(tmp); // integral |
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219 | y2 = run2.GetY(i); |
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220 | y = theInt.Lin(x, x1,x2,y1,y2); |
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221 | thBuff2.SetData(i, tmp, y); |
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222 | } |
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223 | G4NeutronHPVector theThVec; |
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224 | theThVec.Merge(&thBuff1 ,&thBuff2); // takes care of interpolation |
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225 | G4double random = (theThVec.GetY(theThVec.GetVectorLength()-1) |
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226 | -theThVec.GetY(0)) *G4UniformRand(); |
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227 | G4int ith(0); |
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228 | for(i=1;i<theThVec.GetVectorLength(); i++) |
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229 | { |
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230 | ith = i; |
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231 | if(random<theThVec.GetY(i)-theThVec.GetY(0)) break; |
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232 | } |
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233 | { |
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234 | // calculate theta |
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235 | G4double x, x1, x2, y1, y2; |
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236 | x = random; |
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237 | x1 = theThVec.GetY(ith-1)-theThVec.GetY(0); // integrals |
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238 | x2 = theThVec.GetY(ith)-theThVec.GetY(0); |
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239 | y1 = theThVec.GetX(ith-1); // std::cos(theta) |
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240 | y2 = theThVec.GetX(ith); |
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241 | cosTh = theInt.Interpolate(theSecondManager[it].GetScheme(ith), |
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242 | x, x1,x2,y1,y2); |
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243 | } |
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244 | G4int i1(0), i2(0); |
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245 | // get the indixes of the vectors close to theta for low energy |
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246 | // first it-1 !!!! i.e. low in energy |
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247 | for(i=0; i<nCosTh[it-1]; i++) |
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248 | { |
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249 | i1 = i; |
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250 | if(cosTh<theData[it-1][i].GetLabel()) break; |
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251 | } |
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252 | // now get the prob at this energy for the right theta value |
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253 | x = cosTh; |
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254 | x1 = theData[it-1][i1-1].GetLabel(); |
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255 | x2 = theData[it-1][i1].GetLabel(); |
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256 | G4NeutronHPVector theBuff1a; |
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257 | theBuff1a.SetInterpolationManager(theData[it-1][i1-1].GetInterpolationManager()); |
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258 | for(i=0;i<theData[it-1][i1-1].GetVectorLength(); i++) |
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259 | { |
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260 | E = theData[it-1][i1-1].GetX(i); |
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261 | y1 = theData[it-1][i1-1].GetY(i); |
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262 | y2 = theData[it-1][i1].GetY(E); |
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263 | y = theInt.Lin(x, x1,x2,y1,y2); |
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264 | theBuff1a.SetData(i, E, y); // wrong E, right theta. |
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265 | } |
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266 | G4NeutronHPVector theBuff2a; |
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267 | theBuff2a.SetInterpolationManager(theData[it-1][i1].GetInterpolationManager()); |
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268 | for(i=0;i<theData[it-1][i1].GetVectorLength(); i++) |
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269 | { |
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270 | E = theData[it-1][i1].GetX(i); |
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271 | y1 = theData[it-1][i1-1].GetY(E); |
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272 | y2 = theData[it-1][i1].GetY(i); |
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273 | y = theInt.Lin(x, x1,x2,y1,y2); |
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274 | theBuff2a.SetData(i, E, y); // wrong E, right theta. |
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275 | } |
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276 | G4NeutronHPVector theStore1; |
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277 | theStore1.Merge(&theBuff1a, &theBuff2a); // wrong E, right theta, complete binning |
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278 | |
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279 | // get the indixes of the vectors close to theta for high energy |
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280 | // then it !!!! i.e. high in energy |
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281 | for(i=0; i<nCosTh[it]; i++) |
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282 | { |
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283 | i2 = i; |
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284 | if(cosTh<theData[it][i2].GetLabel()) break; |
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285 | } // sonderfaelle mit i1 oder i2 head on fehlen. @@@@@ |
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286 | x1 = theData[it][i2-1].GetLabel(); |
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287 | x2 = theData[it][i2].GetLabel(); |
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288 | G4NeutronHPVector theBuff1b; |
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289 | theBuff1b.SetInterpolationManager(theData[it][i2-1].GetInterpolationManager()); |
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290 | for(i=0;i<theData[it][i2-1].GetVectorLength(); i++) |
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291 | { |
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292 | E = theData[it][i2-1].GetX(i); |
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293 | y1 = theData[it][i2-1].GetY(i); |
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294 | y2 = theData[it][i2].GetY(E); |
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295 | y = theInt.Lin(x, x1,x2,y1,y2); |
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296 | theBuff1b.SetData(i, E, y); // wrong E, right theta. |
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297 | } |
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298 | G4NeutronHPVector theBuff2b; |
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299 | theBuff2b.SetInterpolationManager(theData[it][i2].GetInterpolationManager()); |
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300 | for(i=0;i<theData[it][i1].GetVectorLength(); i++) |
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301 | { |
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302 | E = theData[it][i1].GetX(i); |
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303 | y1 = theData[it][i1-1].GetY(E); |
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304 | y2 = theData[it][i1].GetY(i); |
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305 | y = theInt.Lin(x, x1,x2,y1,y2); |
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306 | theBuff2b.SetData(i, E, y); // wrong E, right theta. |
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307 | } |
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308 | G4NeutronHPVector theStore2; |
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309 | theStore2.Merge(&theBuff1b, &theBuff2b); // wrong E, right theta, complete binning |
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310 | // now get to the right energy. |
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311 | |
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312 | x = anEnergy; |
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313 | x1 = theEnergies[it-1]; |
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314 | x2 = theEnergies[it]; |
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315 | G4NeutronHPVector theOne1; |
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316 | theOne1.SetInterpolationManager(theStore1.GetInterpolationManager()); |
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317 | for(i=0; i<theStore1.GetVectorLength(); i++) |
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318 | { |
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319 | E = theStore1.GetX(i); |
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320 | y1 = theStore1.GetY(i); |
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321 | y2 = theStore2.GetY(E); |
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322 | y = theInt.Interpolate(theManager.GetScheme(it), x, x1,x2,y1,y2); |
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323 | theOne1.SetData(i, E, y); // both correct |
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324 | } |
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325 | G4NeutronHPVector theOne2; |
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326 | theOne2.SetInterpolationManager(theStore2.GetInterpolationManager()); |
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327 | for(i=0; i<theStore2.GetVectorLength(); i++) |
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328 | { |
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329 | E = theStore2.GetX(i); |
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330 | y1 = theStore1.GetY(E); |
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331 | y2 = theStore2.GetY(i); |
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332 | y = theInt.Interpolate(theManager.GetScheme(it), x, x1,x2,y1,y2); |
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333 | theOne2.SetData(i, E, y); // both correct |
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334 | } |
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335 | G4NeutronHPVector theOne; |
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336 | theOne.Merge(&theOne1, &theOne2); // both correct, complete binning |
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337 | |
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338 | secEnergy = theOne.Sample(); |
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339 | currentMeanEnergy = theOne.GetMeanX(); |
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340 | } |
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341 | |
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342 | // now do random direction in phi, and fill the result. |
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343 | |
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344 | result->SetKineticEnergy(secEnergy); |
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345 | |
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346 | G4double phi = twopi*G4UniformRand(); |
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347 | G4double theta = std::acos(cosTh); |
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348 | G4double sinth = std::sin(theta); |
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349 | G4double mtot = result->GetTotalMomentum(); |
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350 | G4ThreeVector tempVector(mtot*sinth*std::cos(phi), mtot*sinth*std::sin(phi), mtot*std::cos(theta) ); |
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351 | result->SetMomentum(tempVector); |
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352 | |
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353 | return result; |
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354 | } |
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