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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 | // 100413 Fix bug in incidence energy by T. Koi |
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31 | // |
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32 | #include "G4NeutronHPEnAngCorrelation.hh" |
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33 | #include "G4LorentzRotation.hh" |
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34 | #include "G4LorentzVector.hh" |
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35 | #include "G4RotationMatrix.hh" |
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36 | |
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37 | G4ReactionProduct * G4NeutronHPEnAngCorrelation::SampleOne(G4double anEnergy) |
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38 | { |
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39 | G4ReactionProduct * result = new G4ReactionProduct; |
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40 | |
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41 | // do we have an appropriate distribution |
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42 | if(nProducts!=1) throw G4HadronicException(__FILE__, __LINE__, "More than one product in SampleOne"); |
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43 | |
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44 | // get the result |
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45 | G4ReactionProductVector * temp=0; |
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46 | G4int i=0; |
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47 | while(temp == 0) temp = theProducts[i++].Sample(anEnergy); |
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48 | |
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49 | // is the multiplicity correct |
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50 | if(temp->size()!=1) throw G4HadronicException(__FILE__, __LINE__, "SampleOne: Yield not correct"); |
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51 | |
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52 | // fill result |
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53 | result = temp->operator[](0); |
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54 | |
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55 | // some garbage collection |
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56 | delete temp; |
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57 | |
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58 | // return result |
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59 | return result; |
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60 | } |
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61 | |
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62 | G4ReactionProductVector * G4NeutronHPEnAngCorrelation::Sample(G4double anEnergy) |
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63 | { |
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64 | G4ReactionProductVector * result = new G4ReactionProductVector; |
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65 | G4int i; |
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66 | G4ReactionProductVector * it; |
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67 | G4ReactionProduct theCMS; |
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68 | G4LorentzRotation toZ; |
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69 | if(frameFlag==2) |
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70 | { |
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71 | // simplify and double check @ |
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72 | G4ThreeVector the3Neutron = theNeutron.GetMomentum(); //theNeutron has value in LAB |
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73 | G4double nEnergy = theNeutron.GetTotalEnergy(); |
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74 | G4ThreeVector the3Target = theTarget.GetMomentum(); //theTarget has value in LAB |
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75 | G4double tEnergy = theTarget.GetTotalEnergy(); |
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76 | G4double totE = nEnergy+tEnergy; |
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77 | G4ThreeVector the3CMS = the3Target+the3Neutron; |
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78 | theCMS.SetMomentum(the3CMS); |
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79 | G4double cmsMom = std::sqrt(the3CMS*the3CMS); |
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80 | G4double sqrts = std::sqrt((totE-cmsMom)*(totE+cmsMom)); |
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81 | theCMS.SetMass(sqrts); |
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82 | theCMS.SetTotalEnergy(totE); |
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83 | G4ReactionProduct aNeutron; |
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84 | aNeutron.Lorentz(theNeutron, theCMS); |
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85 | //TKDB 100413 |
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86 | //ENDF-6 Formats Manual ENDF-102 |
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87 | //CHAPTER 6. FILE 6: PRODUCT ENERGY-ANGLE DISTRIBUTIONS |
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88 | //LCT Reference system for secondary energy and angle (incident energy is always given in the LAB system) |
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89 | //anEnergy = aNeutron.GetKineticEnergy(); |
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90 | anEnergy = theNeutron.GetKineticEnergy(); //should be same argumment of "anEnergy" |
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91 | |
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92 | G4LorentzVector Ptmp (aNeutron.GetMomentum(), aNeutron.GetTotalEnergy()); |
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93 | |
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94 | toZ.rotateZ(-1*Ptmp.phi()); |
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95 | toZ.rotateY(-1*Ptmp.theta()); |
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96 | } |
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97 | theTotalMeanEnergy=0; |
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98 | G4LorentzRotation toLab(toZ.inverse()); //toLab only change axis NOT to LAB system |
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99 | for(i=0; i<nProducts; i++) |
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100 | { |
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101 | it = theProducts[i].Sample(anEnergy); |
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102 | G4double aMeanEnergy = theProducts[i].MeanEnergyOfThisInteraction(); |
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103 | if(aMeanEnergy>0) |
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104 | { |
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105 | theTotalMeanEnergy += aMeanEnergy; |
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106 | } |
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107 | else |
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108 | { |
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109 | theTotalMeanEnergy = anEnergy/nProducts+theProducts[i].GetQValue(); |
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110 | } |
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111 | if(it!=0) |
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112 | { |
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113 | for(unsigned int ii=0; ii<it->size(); ii++) |
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114 | { |
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115 | G4LorentzVector pTmp1 (it->operator[](ii)->GetMomentum(), |
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116 | it->operator[](ii)->GetTotalEnergy()); |
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117 | pTmp1 = toLab*pTmp1; |
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118 | it->operator[](ii)->SetMomentum(pTmp1.vect()); |
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119 | it->operator[](ii)->SetTotalEnergy(pTmp1.e()); |
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120 | if(frameFlag==1) // target rest //TK 100413 should be LAB? |
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121 | { |
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122 | it->operator[](ii)->Lorentz(*(it->operator[](ii)), -1.*theTarget); //TK 100413 Is this really need? |
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123 | } |
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124 | else if(frameFlag==2) // CMS |
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125 | { |
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126 | #ifdef G4_NHP_DEBUG |
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127 | cout <<"G4NeutronHPEnAngCorrelation: "<< |
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128 | it->at(ii)->GetTotalEnergy()<<" "<< |
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129 | it->at(ii)->GetMomentum()<<G4endl; |
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130 | #endif |
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131 | it->operator[](ii)->Lorentz(*(it->operator[](ii)), -1.*theCMS); |
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132 | } |
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133 | else |
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134 | { |
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135 | throw G4HadronicException(__FILE__, __LINE__, "G4NeutronHPEnAngCorrelation::Sample: The frame of the finalstate is not specified"); |
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136 | } |
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137 | result->push_back(it->operator[](ii)); |
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138 | } |
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139 | delete it; |
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140 | } |
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141 | } |
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142 | return result; |
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143 | } |
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144 | |
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