1 | // |
---|
2 | // ******************************************************************** |
---|
3 | // * License and Disclaimer * |
---|
4 | // * * |
---|
5 | // * The Geant4 software is copyright of the Copyright Holders of * |
---|
6 | // * the Geant4 Collaboration. It is provided under the terms and * |
---|
7 | // * conditions of the Geant4 Software License, included in the file * |
---|
8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
---|
9 | // * include a list of copyright holders. * |
---|
10 | // * * |
---|
11 | // * Neither the authors of this software system, nor their employing * |
---|
12 | // * institutes,nor the agencies providing financial support for this * |
---|
13 | // * work make any representation or warranty, express or implied, * |
---|
14 | // * regarding this software system or assume any liability for its * |
---|
15 | // * use. Please see the license in the file LICENSE and URL above * |
---|
16 | // * for the full disclaimer and the limitation of liability. * |
---|
17 | // * * |
---|
18 | // * This code implementation is the result of the scientific and * |
---|
19 | // * technical work of the GEANT4 collaboration. * |
---|
20 | // * By using, copying, modifying or distributing the software (or * |
---|
21 | // * any work based on the software) you agree to acknowledge its * |
---|
22 | // * use in resulting scientific publications, and indicate your * |
---|
23 | // * acceptance of all terms of the Geant4 Software license. * |
---|
24 | // ******************************************************************** |
---|
25 | // |
---|
26 | // $Id: G4NeutronRadCapture.cc,v 1.4 2009/12/16 17:51:11 gunter Exp $ |
---|
27 | // GEANT4 tag $Name: geant4-09-03 $ |
---|
28 | // |
---|
29 | // |
---|
30 | // Physics model class G4NeutronRadCapture |
---|
31 | // Created: 31 August 2009 |
---|
32 | // Author V.Ivanchenko |
---|
33 | // |
---|
34 | // Modified: |
---|
35 | // |
---|
36 | // |
---|
37 | |
---|
38 | #include "G4NeutronRadCapture.hh" |
---|
39 | #include "G4ParticleDefinition.hh" |
---|
40 | #include "G4Fragment.hh" |
---|
41 | #include "G4FragmentVector.hh" |
---|
42 | #include "G4NucleiProperties.hh" |
---|
43 | #include "G4PhotonEvaporation.hh" |
---|
44 | #include "G4DynamicParticle.hh" |
---|
45 | #include "G4ParticleDefinition.hh" |
---|
46 | #include "G4ParticleTable.hh" |
---|
47 | #include "G4Deuteron.hh" |
---|
48 | #include "G4Triton.hh" |
---|
49 | #include "G4He3.hh" |
---|
50 | #include "G4Alpha.hh" |
---|
51 | |
---|
52 | G4NeutronRadCapture::G4NeutronRadCapture() |
---|
53 | : G4HadronicInteraction("nRadCapture") |
---|
54 | { |
---|
55 | lowestEnergyLimit = 0.1*eV; |
---|
56 | SetMinEnergy( 0.0*GeV ); |
---|
57 | SetMaxEnergy( 100.*TeV ); |
---|
58 | // photonEvaporation = new G4PhotonEvaporation(); |
---|
59 | photonEvaporation = 0; |
---|
60 | } |
---|
61 | |
---|
62 | G4NeutronRadCapture::~G4NeutronRadCapture() |
---|
63 | { |
---|
64 | delete photonEvaporation; |
---|
65 | } |
---|
66 | |
---|
67 | G4HadFinalState* G4NeutronRadCapture::ApplyYourself( |
---|
68 | const G4HadProjectile& aTrack, G4Nucleus& targetNucleus) |
---|
69 | { |
---|
70 | theParticleChange.Clear(); |
---|
71 | |
---|
72 | G4int Z = static_cast<G4int>(targetNucleus.GetZ()+0.5); |
---|
73 | G4int A = static_cast<G4int>(targetNucleus.GetN()+0.5); |
---|
74 | |
---|
75 | // Create initial state |
---|
76 | G4double m1 = G4NucleiProperties::GetNuclearMass(A, Z); |
---|
77 | G4LorentzVector lv0(0.0,0.0,0.0,m1); |
---|
78 | G4LorentzVector lv1 = aTrack.Get4Momentum() + lv0; |
---|
79 | G4ThreeVector bst = lv1.boostVector(); |
---|
80 | G4double M = lv1.mag(); |
---|
81 | |
---|
82 | ++A; |
---|
83 | G4double m2 = G4NucleiProperties::GetNuclearMass(A, Z); |
---|
84 | if(M - m2 <= lowestEnergyLimit) { |
---|
85 | return &theParticleChange; |
---|
86 | } |
---|
87 | |
---|
88 | if (verboseLevel > 1) { |
---|
89 | G4cout << "G4NeutronRadCapture::DoIt: Eini(MeV)=" |
---|
90 | << aTrack.GetKineticEnergy()/MeV << " Eexc(MeV)= " |
---|
91 | << (M - m2)/MeV |
---|
92 | << " Z= " << Z << " A= " << A << G4endl; |
---|
93 | } |
---|
94 | |
---|
95 | G4double e1 = (M - m2)*(M + m2)/(2*M); |
---|
96 | G4double cost = 2.0*G4UniformRand() - 1.0; |
---|
97 | if(cost > 1.0) {cost = 1.0;} |
---|
98 | else if(cost < -1.0) {cost = -1.0;} |
---|
99 | G4double sint = std::sqrt((1. - cost)*(1.0 + cost)); |
---|
100 | G4double phi = G4UniformRand()*CLHEP::twopi; |
---|
101 | G4LorentzVector lv2(e1*sint*std::cos(phi),e1*sint*std::sin(phi),e1*cost,e1); |
---|
102 | lv2.boost(bst); |
---|
103 | theParticleChange.AddSecondary(new G4DynamicParticle(G4Gamma::Gamma(), lv2)); |
---|
104 | G4ParticleDefinition* theDef = 0; |
---|
105 | |
---|
106 | lv1 -= lv2; |
---|
107 | if(Z > 2 || A > 4) |
---|
108 | { |
---|
109 | theDef = G4ParticleTable::GetParticleTable()->FindIon(Z,A,0,Z); |
---|
110 | } |
---|
111 | else if (Z == 1 && A == 2) {theDef = G4Deuteron::Deuteron();} |
---|
112 | else if (Z == 1 && A == 3) {theDef = G4Triton::Triton();} |
---|
113 | else if (Z == 2 && A == 3) {theDef = G4He3::He3();} |
---|
114 | else if (Z == 2 && A == 4) {theDef = G4Alpha::Alpha();} |
---|
115 | |
---|
116 | if (verboseLevel > 1) { |
---|
117 | G4cout << "Gamma 4-mom: " << lv2 << " " |
---|
118 | << theDef->GetParticleName() << " " << lv1 << G4endl; |
---|
119 | } |
---|
120 | if(theDef) { |
---|
121 | theParticleChange.AddSecondary(new G4DynamicParticle(theDef, lv1)); |
---|
122 | } |
---|
123 | |
---|
124 | /* |
---|
125 | // Create fragment in its rest frame |
---|
126 | lv1.boost(-bst); |
---|
127 | G4Fragment aNucleus(A+1, Z, lv1); |
---|
128 | if(aNucleus.GetExcitationEnergy() <= lowestEnergyLimit) { |
---|
129 | return &theParticleChange; |
---|
130 | } |
---|
131 | |
---|
132 | if (verboseLevel > 1) { |
---|
133 | G4cout << "G4NeutronRadCapture::DoIt: Eini(MeV)=" |
---|
134 | << aTrack.GetKineticEnergy()/MeV << " Eexc(MeV)= " |
---|
135 | << lv1.e() - G4NucleiProperties::GetNuclearMass(A+1, Z) |
---|
136 | << " Z= " << Z << " A= " << A + 1 << G4endl; |
---|
137 | } |
---|
138 | |
---|
139 | // |
---|
140 | // Sample final state |
---|
141 | // |
---|
142 | |
---|
143 | G4FragmentVector* fv = photonEvaporation->BreakItUp(aNucleus); |
---|
144 | size_t n = fv->size(); |
---|
145 | |
---|
146 | if (verboseLevel > 1) { |
---|
147 | G4cout << "G4NeutronRadCapture: " << n << " final particle" << G4endl; |
---|
148 | } |
---|
149 | for(size_t i=0; i<n; ++i) { |
---|
150 | G4Fragment* f = (*fv)[i]; |
---|
151 | G4LorentzVector lvres = f->GetMomentum(); |
---|
152 | lvres.boost(bst); |
---|
153 | G4int Z = G4int(f->GetZ() + 0.5); |
---|
154 | G4int A = G4int(f->GetA() + 0.5); |
---|
155 | |
---|
156 | G4ParticleDefinition* theDef = 0; |
---|
157 | if(0 == Z && 0 == A) {theDef = f->GetParticleDefinition();} |
---|
158 | else if(Z > 2 || A > 4) |
---|
159 | { |
---|
160 | theDef = G4ParticleTable::GetParticleTable()->FindIon(Z,A,0,Z); |
---|
161 | } |
---|
162 | else if (Z == 1 && A == 2) {theDef = G4Deuteron::Deuteron();} |
---|
163 | else if (Z == 1 && A == 3) {theDef = G4Triton::Triton();} |
---|
164 | else if (Z == 2 && A == 3) {theDef = G4He3::He3();} |
---|
165 | else if (Z == 2 && A == 4) {theDef = G4Alpha::Alpha();} |
---|
166 | |
---|
167 | if (verboseLevel > 1) { |
---|
168 | G4cout << i << ". " << theDef->GetParticleName() |
---|
169 | << " " << lvres << G4endl; |
---|
170 | } |
---|
171 | if(theDef) { |
---|
172 | theParticleChange.AddSecondary(new G4DynamicParticle(theDef, lvres)); |
---|
173 | } |
---|
174 | delete f; |
---|
175 | } |
---|
176 | */ |
---|
177 | return &theParticleChange; |
---|
178 | } |
---|
179 | |
---|