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: G4VGammaDeexcitation.cc,v 1.20 2010/11/17 19:17:17 vnivanch Exp $ |
---|
27 | // GEANT4 tag $Name: geant4-09-04-ref-00 $ |
---|
28 | // |
---|
29 | // ------------------------------------------------------------------- |
---|
30 | // GEANT 4 class file |
---|
31 | // |
---|
32 | // CERN, Geneva, Switzerland |
---|
33 | // |
---|
34 | // File name: G4VGammaDeexcitation |
---|
35 | // |
---|
36 | // Author: Maria Grazia Pia (pia@genova.infn.it) |
---|
37 | // |
---|
38 | // Creation date: 23 October 1998 |
---|
39 | // |
---|
40 | // Modifications: |
---|
41 | // |
---|
42 | // 21 Nov 2001, Fan Lei (flei@space.qinetiq.com) |
---|
43 | // Modified GenerateGamma() and UpdateUncleus() for implementation |
---|
44 | // of Internal Conversion processs |
---|
45 | // |
---|
46 | // 15 April 1999, Alessandro Brunengo (Alessandro.Brunengo@ge.infn.it) |
---|
47 | // Added creation time evaluation for products of evaporation |
---|
48 | // |
---|
49 | // 19 April 2010, J. M. Quesada calculations in CM system |
---|
50 | // pending final boost to lab system (not critical) |
---|
51 | // |
---|
52 | // 23 April 2010, V.Ivanchenko rewite kinematic part using PDG formula |
---|
53 | // for 2-body decay |
---|
54 | // |
---|
55 | // ------------------------------------------------------------------- |
---|
56 | |
---|
57 | #include "G4VGammaDeexcitation.hh" |
---|
58 | |
---|
59 | #include "globals.hh" |
---|
60 | #include "Randomize.hh" |
---|
61 | #include "G4Gamma.hh" |
---|
62 | #include "G4Electron.hh" |
---|
63 | #include "G4LorentzVector.hh" |
---|
64 | #include "G4VGammaTransition.hh" |
---|
65 | #include "G4Fragment.hh" |
---|
66 | #include "G4FragmentVector.hh" |
---|
67 | |
---|
68 | #include "G4ParticleTable.hh" |
---|
69 | #include "G4IonTable.hh" |
---|
70 | |
---|
71 | #include "G4DiscreteGammaTransition.hh" |
---|
72 | |
---|
73 | |
---|
74 | G4VGammaDeexcitation::G4VGammaDeexcitation(): _transition(0), _verbose(0), |
---|
75 | _electronO (0), _vSN(-1) |
---|
76 | { |
---|
77 | _nucleus = 0; |
---|
78 | } |
---|
79 | |
---|
80 | G4VGammaDeexcitation::~G4VGammaDeexcitation() |
---|
81 | { |
---|
82 | if (_transition != 0) { delete _transition; } |
---|
83 | } |
---|
84 | |
---|
85 | G4FragmentVector* G4VGammaDeexcitation::DoTransition() |
---|
86 | { |
---|
87 | Initialize(); |
---|
88 | G4FragmentVector* products = new G4FragmentVector(); |
---|
89 | |
---|
90 | if (CanDoTransition()) |
---|
91 | { |
---|
92 | G4Fragment* gamma = GenerateGamma(); |
---|
93 | if (gamma != 0) { products->push_back(gamma); } |
---|
94 | } |
---|
95 | |
---|
96 | if (_verbose > 1) { |
---|
97 | G4cout << "G4VGammaDeexcitation::DoTransition - Transition deleted " << G4endl; |
---|
98 | } |
---|
99 | |
---|
100 | return products; |
---|
101 | } |
---|
102 | |
---|
103 | G4FragmentVector* G4VGammaDeexcitation::DoChain() |
---|
104 | { |
---|
105 | if (_verbose > 1) { G4cout << "G4VGammaDeexcitation::DoChain" << G4endl; } |
---|
106 | const G4double tolerance = CLHEP::keV; |
---|
107 | |
---|
108 | Initialize(); |
---|
109 | G4FragmentVector* products = new G4FragmentVector(); |
---|
110 | |
---|
111 | while (CanDoTransition()) |
---|
112 | { |
---|
113 | _transition->SetEnergyFrom(_nucleus->GetExcitationEnergy()); |
---|
114 | G4Fragment* gamma = GenerateGamma(); |
---|
115 | if (gamma != 0) |
---|
116 | { |
---|
117 | products->push_back(gamma); |
---|
118 | //G4cout << "Eex(keV)= " << _nucleus->GetExcitationEnergy()/keV << G4endl; |
---|
119 | if(_nucleus->GetExcitationEnergy() <= tolerance) { break; } |
---|
120 | Update(); |
---|
121 | } |
---|
122 | } |
---|
123 | |
---|
124 | if (_verbose > 1) { |
---|
125 | G4cout << "G4VGammaDeexcitation::DoChain - Transition deleted, end of chain " << G4endl; |
---|
126 | } |
---|
127 | |
---|
128 | return products; |
---|
129 | } |
---|
130 | |
---|
131 | G4Fragment* G4VGammaDeexcitation::GenerateGamma() |
---|
132 | { |
---|
133 | // 23/04/10 V.Ivanchenko rewrite complitely |
---|
134 | G4double eGamma = 0.; |
---|
135 | |
---|
136 | if (_transition != 0) { |
---|
137 | _transition->SelectGamma(); // it can be conversion electron too |
---|
138 | eGamma = _transition->GetGammaEnergy(); |
---|
139 | if(eGamma <= 0.0) { return 0; } |
---|
140 | } |
---|
141 | G4double excitation = _nucleus->GetExcitationEnergy() - eGamma; |
---|
142 | if(excitation < 0.0) { excitation = 0.0; } |
---|
143 | if (_verbose > 1 && _transition != 0 ) |
---|
144 | { |
---|
145 | G4cout << "G4VGammaDeexcitation::GenerateGamma - Edeexc(MeV)= " << eGamma |
---|
146 | << " ** left Eexc(MeV)= " << excitation |
---|
147 | << G4endl; |
---|
148 | } |
---|
149 | |
---|
150 | // Do complete Lorentz computation |
---|
151 | |
---|
152 | G4LorentzVector lv = _nucleus->GetMomentum(); |
---|
153 | G4double Mass = _nucleus->GetGroundStateMass() + excitation; |
---|
154 | |
---|
155 | // select secondary |
---|
156 | G4ParticleDefinition* gamma = G4Gamma::Gamma(); |
---|
157 | |
---|
158 | G4DiscreteGammaTransition* dtransition = |
---|
159 | dynamic_cast <G4DiscreteGammaTransition*> (_transition); |
---|
160 | if ( dtransition && !( dtransition->IsAGamma()) ) { |
---|
161 | gamma = G4Electron::Electron(); |
---|
162 | _vSN = dtransition->GetOrbitNumber(); |
---|
163 | _electronO.RemoveElectron(_vSN); |
---|
164 | lv += G4LorentzVector(0.0,0.0,0.0,CLHEP::electron_mass_c2 - dtransition->GetBondEnergy()); |
---|
165 | } |
---|
166 | |
---|
167 | // check consistency |
---|
168 | G4double eMass = gamma->GetPDGMass(); |
---|
169 | |
---|
170 | G4double Ecm = lv.mag(); |
---|
171 | G4ThreeVector bst = lv.boostVector(); |
---|
172 | |
---|
173 | G4double GammaEnergy = 0.5*((Ecm - Mass)*(Ecm + Mass) + eMass*eMass)/Ecm; |
---|
174 | if(GammaEnergy <= eMass) { return 0; } |
---|
175 | |
---|
176 | G4double cosTheta = 1. - 2. * G4UniformRand(); |
---|
177 | G4double sinTheta = std::sqrt(1. - cosTheta * cosTheta); |
---|
178 | G4double phi = twopi * G4UniformRand(); |
---|
179 | G4double mom = std::sqrt((GammaEnergy - eMass)*(GammaEnergy + eMass)); |
---|
180 | G4LorentzVector Gamma4P(mom * sinTheta * std::cos(phi), |
---|
181 | mom * sinTheta * std::sin(phi), |
---|
182 | mom * cosTheta, |
---|
183 | GammaEnergy); |
---|
184 | Gamma4P.boost(bst); |
---|
185 | G4Fragment * thePhoton = new G4Fragment(Gamma4P,gamma); |
---|
186 | |
---|
187 | G4double gammaTime = _nucleus->GetCreationTime() + _transition->GetGammaCreationTime(); |
---|
188 | thePhoton->SetCreationTime(gammaTime); |
---|
189 | |
---|
190 | lv -= Gamma4P; |
---|
191 | _nucleus->SetMomentum(lv); |
---|
192 | _nucleus->SetCreationTime(gammaTime); |
---|
193 | |
---|
194 | //G4cout << "G4VGammaDeexcitation::GenerateGamma left nucleus: " << _nucleus << G4endl; |
---|
195 | return thePhoton; |
---|
196 | } |
---|
197 | |
---|
198 | void G4VGammaDeexcitation::Update() |
---|
199 | { |
---|
200 | if (_transition != 0) |
---|
201 | { |
---|
202 | delete _transition; |
---|
203 | _transition = 0; |
---|
204 | if (_verbose > 1) { |
---|
205 | G4cout << "G4VGammaDeexcitation::Update - Transition deleted " << G4endl; |
---|
206 | } |
---|
207 | } |
---|
208 | |
---|
209 | _transition = CreateTransition(); |
---|
210 | if (_transition != 0) |
---|
211 | { |
---|
212 | _transition->SetEnergyFrom(_nucleus->GetExcitationEnergy()); |
---|
213 | // if ( _vSN != -1) (dynamic_cast <G4DiscreteGammaTransition*> (_transition))->SetICM(false); |
---|
214 | // the above line is commented out for bug fix #952. It was intruduced for reason that |
---|
215 | // the k-shell electron is most likely one to be kicked out and there is no time for |
---|
216 | // the atom to deexcite before the next IC. But this limitation is causing other problems as |
---|
217 | // reported in #952 |
---|
218 | } |
---|
219 | |
---|
220 | return; |
---|
221 | } |
---|