1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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9 | // * include a list of copyright holders. * |
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11 | // * Neither the authors of this software system, nor their employing * |
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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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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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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 | //080612 Bug fix contribution from Benoit Pirard and Laurent Desorgher (Univ. Bern) #2,3 |
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31 | //080709 Bug fix Sampling Legendre expansion by T. Koi |
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32 | //101110 Bug fix in MF=6, LAW=2 case; contribution from E. Mendoza, D. Cano-Ott (CIEMAT) |
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33 | // |
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34 | #include "G4NeutronHPDiscreteTwoBody.hh" |
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35 | #include "G4Gamma.hh" |
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36 | #include "G4Electron.hh" |
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37 | #include "G4Positron.hh" |
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38 | #include "G4Neutron.hh" |
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39 | #include "G4Proton.hh" |
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40 | #include "G4Deuteron.hh" |
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41 | #include "G4Triton.hh" |
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42 | #include "G4He3.hh" |
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43 | #include "G4Alpha.hh" |
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44 | #include "G4NeutronHPVector.hh" |
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45 | #include "G4NeutronHPLegendreStore.hh" |
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46 | |
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47 | G4ReactionProduct * G4NeutronHPDiscreteTwoBody::Sample(G4double anEnergy, G4double massCode, G4double ) |
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48 | { // Interpolation still only for the most used parts; rest to be Done @@@@@ |
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49 | G4ReactionProduct * result = new G4ReactionProduct; |
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50 | G4int Z = static_cast<G4int>(massCode/1000); |
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51 | G4int A = static_cast<G4int>(massCode-1000*Z); |
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52 | |
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53 | if(massCode==0) |
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54 | { |
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55 | result->SetDefinition(G4Gamma::Gamma()); |
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56 | } |
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57 | else if(A==0) |
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58 | { |
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59 | result->SetDefinition(G4Electron::Electron()); |
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60 | if(Z==1) result->SetDefinition(G4Positron::Positron()); |
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61 | } |
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62 | else if(A==1) |
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63 | { |
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64 | result->SetDefinition(G4Neutron::Neutron()); |
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65 | if(Z==1) result->SetDefinition(G4Proton::Proton()); |
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66 | } |
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67 | else if(A==2) |
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68 | { |
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69 | result->SetDefinition(G4Deuteron::Deuteron()); |
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70 | } |
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71 | else if(A==3) |
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72 | { |
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73 | result->SetDefinition(G4Triton::Triton()); |
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74 | if(Z==2) result->SetDefinition(G4He3::He3()); |
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75 | } |
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76 | else if(A==4) |
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77 | { |
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78 | result->SetDefinition(G4Alpha::Alpha()); |
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79 | if(Z!=2) throw G4HadronicException(__FILE__, __LINE__, "Unknown ion case 1"); |
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80 | } |
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81 | else |
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82 | { |
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83 | throw G4HadronicException(__FILE__, __LINE__, "G4NeutronHPDiscreteTwoBody: Unknown ion case 2"); |
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84 | } |
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85 | |
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86 | // get cosine(theta) |
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87 | G4int i(0), it(0); |
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88 | G4double cosTh(0); |
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89 | for(i=0; i<nEnergy; i++) |
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90 | { |
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91 | it = i; |
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92 | if(theCoeff[i].GetEnergy()>anEnergy) break; |
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93 | } |
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94 | if(it==0||it==nEnergy-1) |
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95 | { |
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96 | if(theCoeff[it].GetRepresentation()==0) |
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97 | { |
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98 | //TK Legendre expansion |
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99 | G4NeutronHPLegendreStore theStore(1); |
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100 | theStore.SetCoeff(0, theCoeff); |
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101 | theStore.SetManager(theManager); |
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102 | //cosTh = theStore.SampleMax(anEnergy); |
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103 | //080612TK contribution from Benoit Pirard and Laurent Desorgher (Univ. Bern) #3 |
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104 | cosTh = theStore.SampleDiscreteTwoBody(anEnergy); |
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105 | } |
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106 | else if(theCoeff[it].GetRepresentation()==12) // means LINLIN |
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107 | { |
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108 | G4NeutronHPVector theStore; |
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109 | G4InterpolationManager aManager; |
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110 | aManager.Init(LINLIN, theCoeff[it].GetNumberOfPoly()/2); |
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111 | theStore.SetInterpolationManager(aManager); |
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112 | for(i=0;i<theCoeff[it].GetNumberOfPoly(); i++) |
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113 | { |
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114 | //101110 |
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115 | //theStore.SetX(i, theCoeff[it].GetCoeff(i)); |
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116 | //theStore.SetY(i, theCoeff[it].GetCoeff(i)); |
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117 | theStore.SetX(i/2, theCoeff[it].GetCoeff(i)); |
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118 | theStore.SetY(i/2, theCoeff[it].GetCoeff(i+1)); |
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119 | i++; |
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120 | } |
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121 | cosTh = theStore.Sample(); |
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122 | } |
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123 | else if(theCoeff[it].GetRepresentation()==14) //this is LOGLIN |
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124 | { |
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125 | G4NeutronHPVector theStore; |
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126 | G4InterpolationManager aManager; |
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127 | aManager.Init(LOGLIN, theCoeff[it].GetNumberOfPoly()/2); |
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128 | theStore.SetInterpolationManager(aManager); |
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129 | for(i=0;i<theCoeff[it].GetNumberOfPoly(); i++) |
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130 | { |
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131 | //101110 |
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132 | //theStore.SetX(i, theCoeff[it].GetCoeff(i)); |
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133 | //theStore.SetY(i, theCoeff[it].GetCoeff(i)); |
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134 | theStore.SetX(i/2, theCoeff[it].GetCoeff(i)); |
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135 | theStore.SetY(i/2, theCoeff[it].GetCoeff(i+1)); |
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136 | i++; |
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137 | } |
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138 | cosTh = theStore.Sample(); |
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139 | } |
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140 | else |
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141 | { |
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142 | throw G4HadronicException(__FILE__, __LINE__, "unknown representation type in Two-body scattering"); |
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143 | } |
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144 | } |
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145 | else |
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146 | { |
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147 | if(theCoeff[it].GetRepresentation() == theCoeff[it-1].GetRepresentation()) |
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148 | { |
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149 | if(theCoeff[it].GetRepresentation()==0) |
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150 | { |
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151 | //TK Legendre expansion |
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152 | G4NeutronHPLegendreStore theStore(2); |
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153 | theStore.SetCoeff(0, &(theCoeff[it-1])); |
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154 | theStore.SetCoeff(1, &(theCoeff[it])); |
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155 | G4InterpolationManager aManager; |
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156 | aManager.Init(theManager.GetScheme(it), 2); |
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157 | theStore.SetManager(aManager); |
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158 | //cosTh = theStore.SampleMax(anEnergy); |
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159 | //080709 TKDB |
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160 | cosTh = theStore.SampleDiscreteTwoBody(anEnergy); |
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161 | } |
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162 | else if(theCoeff[it].GetRepresentation()==12) // LINLIN |
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163 | { |
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164 | G4NeutronHPVector theBuff1; |
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165 | G4InterpolationManager aManager1; |
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166 | aManager1.Init(LINLIN, theCoeff[it-1].GetNumberOfPoly()/2); |
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167 | theBuff1.SetInterpolationManager(aManager1); |
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168 | for(i=0;i<theCoeff[it-1].GetNumberOfPoly(); i++) |
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169 | { |
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170 | //101110 |
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171 | //theBuff1.SetX(i, theCoeff[it-1].GetCoeff(i)); |
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172 | //theBuff1.SetY(i, theCoeff[it-1].GetCoeff(i)); |
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173 | theBuff1.SetX(i/2, theCoeff[it-1].GetCoeff(i)); |
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174 | theBuff1.SetY(i/2, theCoeff[it-1].GetCoeff(i+1)); |
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175 | i++; |
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176 | } |
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177 | G4NeutronHPVector theBuff2; |
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178 | G4InterpolationManager aManager2; |
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179 | aManager2.Init(LINLIN, theCoeff[it].GetNumberOfPoly()/2); |
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180 | theBuff2.SetInterpolationManager(aManager2); |
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181 | for(i=0;i<theCoeff[it].GetNumberOfPoly(); i++) |
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182 | { |
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183 | //theBuff2.SetX(i, theCoeff[it].GetCoeff(i)); |
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184 | //theBuff2.SetY(i, theCoeff[it].GetCoeff(i)); |
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185 | theBuff2.SetX(i, theCoeff[it].GetCoeff(i)); |
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186 | theBuff2.SetY(i, theCoeff[it].GetCoeff(i+1)); |
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187 | i++; |
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188 | } |
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189 | |
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190 | G4double x1 = theCoeff[it-1].GetEnergy(); |
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191 | G4double x2 = theCoeff[it].GetEnergy(); |
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192 | G4double x = anEnergy; |
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193 | G4double y1, y2, y, mu; |
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194 | |
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195 | G4NeutronHPVector theStore1; |
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196 | theStore1.SetInterpolationManager(aManager1); |
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197 | G4NeutronHPVector theStore2; |
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198 | theStore2.SetInterpolationManager(aManager2); |
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199 | G4NeutronHPVector theStore; |
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200 | |
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201 | // for fixed mu get p1, p2 and interpolate according to x |
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202 | for(i=0; i<theBuff1.GetVectorLength(); i++) |
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203 | { |
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204 | mu = theBuff1.GetX(i); |
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205 | y1 = theBuff1.GetY(i); |
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206 | y2 = theBuff2.GetY(mu); |
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207 | y = theInt.Interpolate(theManager.GetScheme(it), x, x1,x2,y1,y2); |
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208 | theStore1.SetData(i, mu, y); |
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209 | } |
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210 | for(i=0; i<theBuff2.GetVectorLength(); i++) |
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211 | { |
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212 | mu = theBuff2.GetX(i); |
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213 | y1 = theBuff2.GetY(i); |
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214 | y2 = theBuff1.GetY(mu); |
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215 | y = theInt.Interpolate(theManager.GetScheme(it), x, x1,x2,y1,y2); |
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216 | theStore2.SetData(i, mu, y); |
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217 | } |
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218 | theStore.Merge(&theStore1, &theStore2); // merge takes care of interpolationschemes |
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219 | cosTh = theStore.Sample(); |
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220 | } |
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221 | else if(theCoeff[it].GetRepresentation()==14) //TK LOG_LIN |
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222 | { |
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223 | G4NeutronHPVector theBuff1; |
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224 | G4InterpolationManager aManager1; |
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225 | aManager1.Init(LOGLIN, theCoeff[it-1].GetNumberOfPoly()/2); |
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226 | theBuff1.SetInterpolationManager(aManager1); |
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227 | for(i=0;i<theCoeff[it-1].GetNumberOfPoly(); i++) |
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228 | { |
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229 | //101110 |
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230 | //theBuff1.SetX(i, theCoeff[it-1].GetCoeff(i)); |
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231 | //theBuff1.SetY(i, theCoeff[it-1].GetCoeff(i)); |
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232 | theBuff1.SetX(i/2, theCoeff[it-1].GetCoeff(i)); |
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233 | theBuff1.SetY(i/2, theCoeff[it-1].GetCoeff(i+1)); |
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234 | i++; |
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235 | } |
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236 | |
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237 | G4NeutronHPVector theBuff2; |
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238 | G4InterpolationManager aManager2; |
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239 | aManager2.Init(LOGLIN, theCoeff[it].GetNumberOfPoly()/2); |
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240 | theBuff2.SetInterpolationManager(aManager2); |
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241 | for(i=0;i<theCoeff[it].GetNumberOfPoly(); i++) |
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242 | { |
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243 | //101110 |
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244 | //theBuff2.SetX(i, theCoeff[it].GetCoeff(i)); |
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245 | //theBuff2.SetY(i, theCoeff[it].GetCoeff(i)); |
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246 | theBuff2.SetX(i/2, theCoeff[it].GetCoeff(i)); |
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247 | theBuff2.SetY(i/2, theCoeff[it].GetCoeff(i+1)); |
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248 | i++; |
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249 | } |
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250 | |
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251 | G4double x1 = theCoeff[it-1].GetEnergy(); |
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252 | G4double x2 = theCoeff[it].GetEnergy(); |
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253 | G4double x = anEnergy; |
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254 | G4double y1, y2, y, mu; |
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255 | |
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256 | G4NeutronHPVector theStore1; |
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257 | theStore1.SetInterpolationManager(aManager1); |
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258 | G4NeutronHPVector theStore2; |
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259 | theStore2.SetInterpolationManager(aManager2); |
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260 | G4NeutronHPVector theStore; |
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261 | |
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262 | // for fixed mu get p1, p2 and interpolate according to x |
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263 | for(i=0; i<theBuff1.GetVectorLength(); i++) |
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264 | { |
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265 | mu = theBuff1.GetX(i); |
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266 | y1 = theBuff1.GetY(i); |
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267 | y2 = theBuff2.GetY(mu); |
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268 | y = theInt.Interpolate(theManager.GetScheme(it), x, x1,x2,y1,y2); |
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269 | theStore1.SetData(i, mu, y); |
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270 | } |
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271 | for(i=0; i<theBuff2.GetVectorLength(); i++) |
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272 | { |
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273 | mu = theBuff2.GetX(i); |
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274 | y1 = theBuff2.GetY(i); |
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275 | y2 = theBuff1.GetY(mu); |
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276 | y = theInt.Interpolate(theManager.GetScheme(it), x, x1,x2,y1,y2); |
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277 | theStore2.SetData(i, mu, y); |
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278 | } |
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279 | theStore.Merge(&theStore1, &theStore2); |
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280 | cosTh = theStore.Sample(); |
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281 | } |
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282 | else |
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283 | { |
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284 | throw G4HadronicException(__FILE__, __LINE__, "Two neighbouring distributions with different interpolation"); |
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285 | } |
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286 | } |
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287 | else |
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288 | { |
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289 | throw G4HadronicException(__FILE__, __LINE__, "unknown representation type in Two-body scattering, case 2"); |
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290 | } |
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291 | } |
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292 | |
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293 | // now get the energy from kinematics and Q-value. |
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294 | |
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295 | //G4double restEnergy = anEnergy+GetQValue(); |
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296 | |
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297 | // assumed to be in CMS @@@@@@@@@@@@@@@@@ |
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298 | |
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299 | //080612TK contribution from Benoit Pirard and Laurent Desorgher (Univ. Bern) #2 |
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300 | //G4double residualMass = GetTarget()->GetMass() + GetNeutron()->GetMass() |
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301 | // - result->GetMass() - GetQValue(); |
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302 | //G4double kinE = restEnergy/(1+result->GetMass()/residualMass); // non relativistic @@ |
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303 | G4double A1 = GetTarget()->GetMass()/GetNeutron()->GetMass(); |
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304 | G4double A1prim = result->GetMass()/GetNeutron()->GetMass(); |
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305 | G4double E1 = (A1+1)*(A1+1)/A1/A1*anEnergy; |
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306 | G4double kinE = (A1+1-A1prim)/(A1+1)/(A1+1)*(A1*E1+(1+A1)*GetQValue()); |
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307 | |
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308 | result->SetKineticEnergy(kinE); // non relativistic @@ |
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309 | G4double phi = twopi*G4UniformRand(); |
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310 | G4double theta = std::acos(cosTh); |
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311 | G4double sinth = std::sin(theta); |
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312 | G4double mtot = result->GetTotalMomentum(); |
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313 | G4ThreeVector tempVector(mtot*sinth*std::cos(phi), mtot*sinth*std::sin(phi), mtot*std::cos(theta) ); |
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314 | result->SetMomentum(tempVector); |
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315 | |
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316 | // some garbage collection |
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317 | |
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318 | // return the result |
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319 | return result; |
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320 | } |
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