[1316] | 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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[1337] | 26 | // $Id: G4UnstableFragmentBreakUp.cc,v 1.8 2010/06/25 09:46:09 gunter Exp $ |
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[1347] | 27 | // GEANT4 tag $Name: geant4-09-04-ref-00 $ |
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[1316] | 28 | // |
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| 29 | // ------------------------------------------------------------------- |
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| 30 | // GEANT 4 class file |
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| 31 | // |
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| 32 | // CERN, Geneva, Switzerland |
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| 33 | // |
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| 34 | // File name: G4UnstableFragmentBreakUp |
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| 35 | // |
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| 36 | // Author: V.Ivanchenko |
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| 37 | // |
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| 38 | // Creation date: 11 May 2010 |
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| 39 | // |
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| 40 | //Modifications: |
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| 41 | // |
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| 42 | // ------------------------------------------------------------------- |
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| 43 | // |
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| 44 | |
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| 45 | #include "G4UnstableFragmentBreakUp.hh" |
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| 46 | #include "Randomize.hh" |
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| 47 | #include "G4LorentzVector.hh" |
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| 48 | #include "G4Fragment.hh" |
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| 49 | #include "G4FragmentVector.hh" |
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| 50 | #include "G4NucleiProperties.hh" |
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| 51 | #include "G4NistManager.hh" |
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| 52 | |
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| 53 | G4int G4UnstableFragmentBreakUp::Zfr[6] = {0}; |
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| 54 | G4int G4UnstableFragmentBreakUp::Afr[6] = {0}; |
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| 55 | G4double G4UnstableFragmentBreakUp::masses[6] = {0.0}; |
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| 56 | |
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| 57 | G4UnstableFragmentBreakUp::G4UnstableFragmentBreakUp() |
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| 58 | :verbose(0) |
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| 59 | { |
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| 60 | fNistManager = G4NistManager::Instance(); |
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| 61 | if(0 == Afr[0]) { |
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| 62 | G4int z[6] = {0, 1, 1, 1, 2, 2}; |
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| 63 | G4int a[6] = {1, 1, 2, 3, 3, 4}; |
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| 64 | for(G4int i=0; i<6; ++i) { |
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| 65 | Zfr[i] = z[i]; |
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| 66 | Afr[i] = a[i]; |
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| 67 | masses[i] = G4NucleiProperties::GetNuclearMass(a[i], z[i]); |
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| 68 | } |
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| 69 | } |
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| 70 | } |
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| 71 | |
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| 72 | G4UnstableFragmentBreakUp::~G4UnstableFragmentBreakUp() |
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| 73 | {} |
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| 74 | |
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| 75 | void G4UnstableFragmentBreakUp::Initialize(const G4Fragment&) |
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| 76 | {} |
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| 77 | |
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| 78 | G4Fragment* G4UnstableFragmentBreakUp::EmittedFragment(G4Fragment*) |
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| 79 | { |
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| 80 | return 0; |
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| 81 | } |
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| 82 | |
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| 83 | G4FragmentVector* G4UnstableFragmentBreakUp::BreakUpFragment(G4Fragment* nucleus) |
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| 84 | { |
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| 85 | //G4cout << "G4UnstableFragmentBreakUp::BreakUpFragment" << G4endl; |
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| 86 | G4FragmentVector * theResult = new G4FragmentVector(); |
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| 87 | |
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| 88 | G4int Z = nucleus->GetZ_asInt(); |
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| 89 | G4int A = nucleus->GetA_asInt(); |
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| 90 | G4int Amax = A; |
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| 91 | G4LorentzVector lv = nucleus->GetMomentum(); |
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| 92 | G4double time = nucleus->GetCreationTime(); |
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| 93 | |
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| 94 | G4double deltaE, mass, mass1(0.0), mass2(0.0); |
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| 95 | G4int i, index; |
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| 96 | |
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| 97 | // Starts loop over evaporated particles, loop is limited by number |
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| 98 | // of nucleons |
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| 99 | for(G4int ia=0; ia<Amax; ++ia) { |
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| 100 | |
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| 101 | mass = lv.mag(); |
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| 102 | deltaE = 0.0; |
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| 103 | index = -1; |
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| 104 | for(i=0; i<6; ++i) { |
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| 105 | G4int Zres = Z - Zfr[i]; |
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| 106 | G4int Ares = A - Afr[i]; |
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| 107 | if(Zres >= 0 && Ares >= Zres && Ares > 0) { |
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| 108 | G4double m1 = G4NucleiProperties::GetNuclearMass(Ares, Zres); |
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| 109 | G4double de = mass - m1 - masses[i]; |
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| 110 | if(de > deltaE) { |
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| 111 | mass1 = m1; |
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| 112 | mass2 = masses[i]; |
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| 113 | deltaE= de; |
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| 114 | index = i; |
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| 115 | } |
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| 116 | } |
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| 117 | } |
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| 118 | |
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| 119 | // no decay channels |
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| 120 | if(index < 0) { break; } |
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| 121 | |
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| 122 | // compute energy of light fragment |
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| 123 | G4double e2 = 0.5*((mass - mass1)*(mass + mass1) + mass2*mass2)/mass; |
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| 124 | if(e2 < mass2) { break; } |
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| 125 | |
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| 126 | // sample decay |
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| 127 | G4ThreeVector bst = lv.boostVector(); |
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| 128 | |
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| 129 | G4double cosTheta = 1. - 2. * G4UniformRand(); |
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| 130 | G4double sinTheta = std::sqrt(1. - cosTheta * cosTheta); |
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| 131 | G4double phi = twopi * G4UniformRand(); |
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[1337] | 132 | G4double mom = std::sqrt((e2 - mass2)*(e2 + mass2)); |
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[1316] | 133 | G4LorentzVector mom2(mom * sinTheta * std::cos(phi), |
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| 134 | mom * sinTheta * std::sin(phi), |
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| 135 | mom * cosTheta, |
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| 136 | e2); |
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| 137 | mom2.boost(bst); |
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| 138 | G4Fragment* fr = new G4Fragment(Afr[index], Zfr[index], mom2); |
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| 139 | fr->SetCreationTime(time); |
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| 140 | theResult->push_back(fr); |
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| 141 | |
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| 142 | // residual |
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| 143 | lv -= mom2; |
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| 144 | Z -= Zfr[index]; |
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| 145 | A -= Afr[index]; |
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| 146 | } |
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| 147 | |
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| 148 | // updated fragment |
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| 149 | if( theResult->size() > 0) { |
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| 150 | nucleus->SetZandA_asInt(Z, A); |
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| 151 | nucleus->SetMomentum(lv); |
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| 152 | } |
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| 153 | |
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| 154 | return theResult; |
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| 155 | } |
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| 156 | |
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| 157 | G4FragmentVector* G4UnstableFragmentBreakUp::BreakUp(const G4Fragment&) |
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| 158 | { |
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| 159 | return 0; |
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| 160 | } |
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| 161 | |
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| 162 | G4double G4UnstableFragmentBreakUp::GetEmissionProbability() const |
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| 163 | { |
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| 164 | return 0.0; |
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| 165 | } |
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