[819] | 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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| 9 | // * include a list of copyright holders. * |
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| 10 | // * * |
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| 11 | // * Neither the authors of this software system, nor their employing * |
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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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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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| 16 | // * for the full disclaimer and the limitation of liability. * |
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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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| 20 | // * By using, copying, modifying or distributing the software (or * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 22 | // * use in resulting scientific publications, and indicate your * |
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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 "G4NeutronHPDiscreteTwoBody.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 "G4NeutronHPVector.hh" |
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| 41 | #include "G4NeutronHPLegendreStore.hh" |
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| 42 | |
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| 43 | G4ReactionProduct * G4NeutronHPDiscreteTwoBody::Sample(G4double anEnergy, G4double massCode, G4double ) |
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| 44 | { // Interpolation still only for the most used parts; rest to be Done @@@@@ |
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| 45 | G4ReactionProduct * result = new G4ReactionProduct; |
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| 46 | G4int Z = static_cast<G4int>(massCode/1000); |
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| 47 | G4int A = static_cast<G4int>(massCode-1000*Z); |
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| 48 | |
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| 49 | if(massCode==0) |
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| 50 | { |
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| 51 | result->SetDefinition(G4Gamma::Gamma()); |
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| 52 | } |
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| 53 | else if(A==0) |
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| 54 | { |
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| 55 | result->SetDefinition(G4Electron::Electron()); |
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| 56 | if(Z==1) result->SetDefinition(G4Positron::Positron()); |
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| 57 | } |
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| 58 | else if(A==1) |
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| 59 | { |
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| 60 | result->SetDefinition(G4Neutron::Neutron()); |
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| 61 | if(Z==1) result->SetDefinition(G4Proton::Proton()); |
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| 62 | } |
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| 63 | else if(A==2) |
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| 64 | { |
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| 65 | result->SetDefinition(G4Deuteron::Deuteron()); |
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| 66 | } |
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| 67 | else if(A==3) |
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| 68 | { |
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| 69 | result->SetDefinition(G4Triton::Triton()); |
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| 70 | if(Z==2) result->SetDefinition(G4He3::He3()); |
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| 71 | } |
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| 72 | else if(A==4) |
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| 73 | { |
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| 74 | result->SetDefinition(G4Alpha::Alpha()); |
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| 75 | if(Z!=2) throw G4HadronicException(__FILE__, __LINE__, "Unknown ion case 1"); |
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| 76 | } |
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| 77 | else |
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| 78 | { |
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| 79 | throw G4HadronicException(__FILE__, __LINE__, "G4NeutronHPDiscreteTwoBody: Unknown ion case 2"); |
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| 80 | } |
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| 81 | |
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| 82 | // get cosine(theta) |
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| 83 | G4int i(0), it(0); |
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| 84 | G4double cosTh(0); |
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| 85 | for(i=0; i<nEnergy; i++) |
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| 86 | { |
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| 87 | it = i; |
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| 88 | if(theCoeff[i].GetEnergy()>anEnergy) break; |
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| 89 | } |
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| 90 | if(it==0||it==nEnergy-1) |
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| 91 | { |
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| 92 | if(theCoeff[it].GetRepresentation()==0) |
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| 93 | { |
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| 94 | G4NeutronHPLegendreStore theStore(1); |
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| 95 | theStore.SetCoeff(0, theCoeff); |
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| 96 | theStore.SetManager(theManager); |
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| 97 | cosTh = theStore.SampleMax(anEnergy); |
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| 98 | } |
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| 99 | else if(theCoeff[it].GetRepresentation()==12) // means LINLIN |
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| 100 | { |
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| 101 | G4NeutronHPVector theStore; |
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| 102 | G4InterpolationManager aManager; |
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| 103 | aManager.Init(LINLIN, theCoeff[it].GetNumberOfPoly()/2); |
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| 104 | theStore.SetInterpolationManager(aManager); |
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| 105 | for(i=0;i<theCoeff[it].GetNumberOfPoly(); i++) |
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| 106 | { |
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| 107 | theStore.SetX(i, theCoeff[it].GetCoeff(i)); |
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| 108 | theStore.SetY(i, theCoeff[it].GetCoeff(i)); |
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| 109 | i++; |
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| 110 | } |
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| 111 | cosTh = theStore.Sample(); |
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| 112 | } |
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| 113 | else if(theCoeff[it].GetRepresentation()==14) //this is LOGLIN |
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| 114 | { |
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| 115 | G4NeutronHPVector theStore; |
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| 116 | G4InterpolationManager aManager; |
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| 117 | aManager.Init(LOGLIN, theCoeff[it].GetNumberOfPoly()/2); |
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| 118 | theStore.SetInterpolationManager(aManager); |
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| 119 | for(i=0;i<theCoeff[it].GetNumberOfPoly(); i++) |
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| 120 | { |
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| 121 | theStore.SetX(i, theCoeff[it].GetCoeff(i)); |
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| 122 | theStore.SetY(i, theCoeff[it].GetCoeff(i)); |
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| 123 | i++; |
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| 124 | } |
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| 125 | cosTh = theStore.Sample(); |
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| 126 | } |
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| 127 | else |
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| 128 | { |
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| 129 | throw G4HadronicException(__FILE__, __LINE__, "unknown representation type in Two-body scattering"); |
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| 130 | } |
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| 131 | } |
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| 132 | else |
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| 133 | { |
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| 134 | if(theCoeff[it].GetRepresentation() == theCoeff[it-1].GetRepresentation()) |
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| 135 | { |
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| 136 | if(theCoeff[it].GetRepresentation()==0) |
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| 137 | { |
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| 138 | G4NeutronHPLegendreStore theStore(2); |
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| 139 | theStore.SetCoeff(0, &(theCoeff[it-1])); |
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| 140 | theStore.SetCoeff(1, &(theCoeff[it])); |
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| 141 | G4InterpolationManager aManager; |
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| 142 | aManager.Init(theManager.GetScheme(it), 2); |
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| 143 | theStore.SetManager(aManager); |
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| 144 | cosTh = theStore.SampleMax(anEnergy); |
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| 145 | } |
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| 146 | else if(theCoeff[it].GetRepresentation()==12) // LINLIN |
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| 147 | { |
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| 148 | G4NeutronHPVector theBuff1; |
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| 149 | G4InterpolationManager aManager1; |
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| 150 | aManager1.Init(LINLIN, theCoeff[it-1].GetNumberOfPoly()/2); |
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| 151 | theBuff1.SetInterpolationManager(aManager1); |
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| 152 | for(i=0;i<theCoeff[it-1].GetNumberOfPoly(); i++) |
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| 153 | { |
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| 154 | theBuff1.SetX(i, theCoeff[it-1].GetCoeff(i)); |
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| 155 | theBuff1.SetY(i, theCoeff[it-1].GetCoeff(i)); |
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| 156 | i++; |
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| 157 | } |
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| 158 | G4NeutronHPVector theBuff2; |
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| 159 | G4InterpolationManager aManager2; |
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| 160 | aManager2.Init(LINLIN, theCoeff[it].GetNumberOfPoly()/2); |
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| 161 | theBuff2.SetInterpolationManager(aManager2); |
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| 162 | for(i=0;i<theCoeff[it].GetNumberOfPoly(); i++) |
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| 163 | { |
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| 164 | theBuff2.SetX(i, theCoeff[it].GetCoeff(i)); |
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| 165 | theBuff2.SetY(i, theCoeff[it].GetCoeff(i)); |
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| 166 | i++; |
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| 167 | } |
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| 168 | |
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| 169 | G4double x1 = theCoeff[it-1].GetEnergy(); |
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| 170 | G4double x2 = theCoeff[it].GetEnergy(); |
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| 171 | G4double x = anEnergy; |
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| 172 | G4double y1, y2, y, mu; |
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| 173 | |
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| 174 | G4NeutronHPVector theStore1; |
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| 175 | theStore1.SetInterpolationManager(aManager1); |
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| 176 | G4NeutronHPVector theStore2; |
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| 177 | theStore2.SetInterpolationManager(aManager2); |
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| 178 | G4NeutronHPVector theStore; |
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| 179 | |
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| 180 | // for fixed mu get p1, p2 and interpolate according to x |
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| 181 | for(i=0; i<theBuff1.GetVectorLength(); i++) |
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| 182 | { |
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| 183 | mu = theBuff1.GetX(i); |
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| 184 | y1 = theBuff1.GetY(i); |
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| 185 | y2 = theBuff2.GetY(mu); |
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| 186 | y = theInt.Interpolate(theManager.GetScheme(it), x, x1,x2,y1,y2); |
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| 187 | theStore1.SetData(i, mu, y); |
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| 188 | } |
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| 189 | for(i=0; i<theBuff2.GetVectorLength(); i++) |
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| 190 | { |
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| 191 | mu = theBuff2.GetX(i); |
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| 192 | y1 = theBuff2.GetY(i); |
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| 193 | y2 = theBuff1.GetY(mu); |
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| 194 | y = theInt.Interpolate(theManager.GetScheme(it), x, x1,x2,y1,y2); |
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| 195 | theStore2.SetData(i, mu, y); |
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| 196 | } |
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| 197 | theStore.Merge(&theStore1, &theStore2); // merge takes care of interpolationschemes |
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| 198 | cosTh = theStore.Sample(); |
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| 199 | } |
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| 200 | else if(theCoeff[it].GetRepresentation()==14) |
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| 201 | { |
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| 202 | G4NeutronHPVector theBuff1; |
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| 203 | G4InterpolationManager aManager1; |
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| 204 | aManager1.Init(LOGLIN, theCoeff[it-1].GetNumberOfPoly()/2); |
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| 205 | theBuff1.SetInterpolationManager(aManager1); |
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| 206 | for(i=0;i<theCoeff[it-1].GetNumberOfPoly(); i++) |
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| 207 | { |
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| 208 | theBuff1.SetX(i, theCoeff[it-1].GetCoeff(i)); |
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| 209 | theBuff1.SetY(i, theCoeff[it-1].GetCoeff(i)); |
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| 210 | i++; |
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| 211 | } |
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| 212 | |
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| 213 | G4NeutronHPVector theBuff2; |
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| 214 | G4InterpolationManager aManager2; |
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| 215 | aManager2.Init(LOGLIN, theCoeff[it].GetNumberOfPoly()/2); |
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| 216 | theBuff2.SetInterpolationManager(aManager2); |
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| 217 | for(i=0;i<theCoeff[it].GetNumberOfPoly(); i++) |
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| 218 | { |
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| 219 | theBuff2.SetX(i, theCoeff[it].GetCoeff(i)); |
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| 220 | theBuff2.SetY(i, theCoeff[it].GetCoeff(i)); |
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| 221 | i++; |
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| 222 | } |
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| 223 | |
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| 224 | G4double x1 = theCoeff[it-1].GetEnergy(); |
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| 225 | G4double x2 = theCoeff[it].GetEnergy(); |
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| 226 | G4double x = anEnergy; |
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| 227 | G4double y1, y2, y, mu; |
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| 228 | |
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| 229 | G4NeutronHPVector theStore1; |
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| 230 | theStore1.SetInterpolationManager(aManager1); |
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| 231 | G4NeutronHPVector theStore2; |
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| 232 | theStore2.SetInterpolationManager(aManager2); |
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| 233 | G4NeutronHPVector theStore; |
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| 234 | |
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| 235 | // for fixed mu get p1, p2 and interpolate according to x |
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| 236 | for(i=0; i<theBuff1.GetVectorLength(); i++) |
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| 237 | { |
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| 238 | mu = theBuff1.GetX(i); |
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| 239 | y1 = theBuff1.GetY(i); |
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| 240 | y2 = theBuff2.GetY(mu); |
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| 241 | y = theInt.Interpolate(theManager.GetScheme(it), x, x1,x2,y1,y2); |
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| 242 | theStore1.SetData(i, mu, y); |
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| 243 | } |
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| 244 | for(i=0; i<theBuff2.GetVectorLength(); i++) |
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| 245 | { |
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| 246 | mu = theBuff2.GetX(i); |
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| 247 | y1 = theBuff2.GetY(i); |
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| 248 | y2 = theBuff1.GetY(mu); |
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| 249 | y = theInt.Interpolate(theManager.GetScheme(it), x, x1,x2,y1,y2); |
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| 250 | theStore2.SetData(i, mu, y); |
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| 251 | } |
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| 252 | theStore.Merge(&theStore1, &theStore2); |
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| 253 | cosTh = theStore.Sample(); |
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| 254 | } |
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| 255 | else |
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| 256 | { |
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| 257 | throw G4HadronicException(__FILE__, __LINE__, "Two neighbouring distributions with different interpolation"); |
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| 258 | } |
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| 259 | } |
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| 260 | else |
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| 261 | { |
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| 262 | throw G4HadronicException(__FILE__, __LINE__, "unknown representation type in Two-body scattering, case 2"); |
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| 263 | } |
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| 264 | } |
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| 265 | |
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| 266 | // now get the energy from kinematics and Q-value. |
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| 267 | |
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| 268 | G4double restEnergy = anEnergy+GetQValue(); |
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| 269 | |
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| 270 | // assumed to be in CMS @@@@@@@@@@@@@@@@@ |
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| 271 | |
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| 272 | G4double residualMass = GetTarget()->GetMass() + GetNeutron()->GetMass() |
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| 273 | - result->GetMass() - GetQValue(); |
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| 274 | G4double kinE = restEnergy/(1+result->GetMass()/residualMass); // non relativistic @@ |
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| 275 | result->SetKineticEnergy(kinE); // non relativistic @@ |
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| 276 | G4double phi = twopi*G4UniformRand(); |
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| 277 | G4double theta = std::acos(cosTh); |
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| 278 | G4double sinth = std::sin(theta); |
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| 279 | G4double mtot = result->GetTotalMomentum(); |
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| 280 | G4ThreeVector tempVector(mtot*sinth*std::cos(phi), mtot*sinth*std::sin(phi), mtot*std::cos(theta) ); |
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| 281 | result->SetMomentum(tempVector); |
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| 282 | |
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| 283 | // some garbage collection |
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| 284 | |
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| 285 | // return the result |
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| 286 | return result; |
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| 287 | } |
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