| 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 | //
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| 27 | // $Id: G4NeutronHPNBodyPhaseSpace.cc,v 1.13 2006/06/29 20:53:11 gunter Exp $
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| 28 | // GEANT4 tag $Name: geant4-09-03-cand-01 $
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| 29 | //
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| 30 | #include "G4NeutronHPNBodyPhaseSpace.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 | #include "G4ThreeVector.hh"
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| 42 |
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| 43 | G4ReactionProduct * G4NeutronHPNBodyPhaseSpace::Sample(G4double anEnergy, G4double massCode, G4double )
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| 44 | {
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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__, "G4NeutronHPNBodyPhaseSpace: Unknown ion case 2");
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| 80 | }
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| 81 |
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| 82 | // Get the energy from phase-space distribution
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| 83 | // in CMS
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| 84 | // P = Cn*std::sqrt(E')*(Emax-E')**(3*n/2-4)
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| 85 | G4double maxE = GetEmax(anEnergy, result->GetMass());
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| 86 | G4double energy;
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| 87 | G4double max(0);
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| 88 | if(theTotalCount<=3)
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| 89 | {
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| 90 | max = maxE/2.;
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| 91 | }
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| 92 | else if(theTotalCount==4)
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| 93 | {
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| 94 | max = maxE/5.;
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| 95 | }
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| 96 | else if(theTotalCount==5)
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| 97 | {
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| 98 | max = maxE/8.;
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| 99 | }
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| 100 | else
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| 101 | {
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| 102 | throw G4HadronicException(__FILE__, __LINE__, "NeutronHP Phase-space distribution cannot cope with this number of particles");
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| 103 | }
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| 104 | G4double testit;
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| 105 | G4double rand0 = Prob(max, maxE, theTotalCount);
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| 106 | G4double rand;
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| 107 |
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| 108 | do
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| 109 | {
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| 110 | rand = rand0*G4UniformRand();
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| 111 | energy = maxE*G4UniformRand();
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| 112 | testit = Prob(energy, maxE, theTotalCount);
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| 113 | }
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| 114 | while(rand > testit);
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| 115 | result->SetKineticEnergy(energy);
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| 116 |
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| 117 | // now do random direction
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| 118 | G4double cosTh = 2.*G4UniformRand()-1.;
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| 119 | G4double phi = twopi*G4UniformRand();
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| 120 | G4double theta = std::acos(cosTh);
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| 121 | G4double sinth = std::sin(theta);
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| 122 | G4double mtot = result->GetTotalMomentum();
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| 123 | G4ThreeVector tempVector(mtot*sinth*std::cos(phi), mtot*sinth*std::sin(phi), mtot*std::cos(theta) );
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| 124 | result->SetMomentum(tempVector);
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| 125 | G4ReactionProduct aCMS = *GetTarget()+*GetNeutron();
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| 126 | result->Lorentz(*result, -1.*aCMS);
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| 127 | return result;
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| 128 | }
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