| Geant4 Cross Reference |
1 // 1 //
2 // ******************************************* 2 // ********************************************************************
3 // * License and Disclaimer 3 // * License and Disclaimer *
4 // * 4 // * *
5 // * The Geant4 software is copyright of th 5 // * The Geant4 software is copyright of the Copyright Holders of *
6 // * the Geant4 Collaboration. It is provided 6 // * the Geant4 Collaboration. It is provided under the terms and *
7 // * conditions of the Geant4 Software License 7 // * conditions of the Geant4 Software License, included in the file *
8 // * LICENSE and available at http://cern.ch/ 8 // * LICENSE and available at http://cern.ch/geant4/license . These *
9 // * include a list of copyright holders. 9 // * include a list of copyright holders. *
10 // * 10 // * *
11 // * Neither the authors of this software syst 11 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing fin 12 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warran 13 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assum 14 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file 15 // * use. Please see the license in the file LICENSE and URL above *
16 // * for the full disclaimer and the limitatio 16 // * for the full disclaimer and the limitation of liability. *
17 // * 17 // * *
18 // * This code implementation is the result 18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboratio 19 // * technical work of the GEANT4 collaboration. *
20 // * By using, copying, modifying or distri 20 // * By using, copying, modifying or distributing the software (or *
21 // * any work based on the software) you ag 21 // * any work based on the software) you agree to acknowledge its *
22 // * use in resulting scientific publicati 22 // * use in resulting scientific publications, and indicate your *
23 // * acceptance of all terms of the Geant4 Sof 23 // * acceptance of all terms of the Geant4 Software license. *
24 // ******************************************* 24 // ********************************************************************
25 // 25 //
>> 26 // $Id: G4MuMinusCapturePrecompound.cc 81888 2014-06-06 13:17:25Z gcosmo $
26 // 27 //
27 //-------------------------------------------- 28 //-----------------------------------------------------------------------------
28 // 29 //
29 // GEANT4 Class file 30 // GEANT4 Class file
30 // 31 //
31 // File name: G4MuMinusCapturePrecompound 32 // File name: G4MuMinusCapturePrecompound
32 // 33 //
33 // Author: V.Ivanchenko (Vladimir.Ivant 34 // Author: V.Ivanchenko (Vladimir.Ivantchenko@cern.ch)
34 // 35 //
35 // Creation date: 22 April 2012 on base of G4M 36 // Creation date: 22 April 2012 on base of G4MuMinusCaptureCascade
36 // 37 //
37 // 38 //
38 //-------------------------------------------- 39 //-----------------------------------------------------------------------------
39 // 40 //
40 // Modifications: 41 // Modifications:
41 // 42 //
42 //-------------------------------------------- 43 //-----------------------------------------------------------------------------
43 44
44 #include "G4MuMinusCapturePrecompound.hh" 45 #include "G4MuMinusCapturePrecompound.hh"
45 #include "Randomize.hh" 46 #include "Randomize.hh"
46 #include "G4RandomDirection.hh" 47 #include "G4RandomDirection.hh"
47 #include "G4PhysicalConstants.hh" 48 #include "G4PhysicalConstants.hh"
48 #include "G4SystemOfUnits.hh" 49 #include "G4SystemOfUnits.hh"
49 #include "G4MuonMinus.hh" 50 #include "G4MuonMinus.hh"
50 #include "G4NeutrinoMu.hh" 51 #include "G4NeutrinoMu.hh"
51 #include "G4Neutron.hh" 52 #include "G4Neutron.hh"
52 #include "G4Proton.hh" 53 #include "G4Proton.hh"
53 #include "G4Triton.hh" 54 #include "G4Triton.hh"
54 #include "G4LorentzVector.hh" 55 #include "G4LorentzVector.hh"
55 #include "G4ParticleDefinition.hh" 56 #include "G4ParticleDefinition.hh"
56 #include "G4NucleiProperties.hh" 57 #include "G4NucleiProperties.hh"
57 #include "G4VPreCompoundModel.hh" 58 #include "G4VPreCompoundModel.hh"
58 #include "G4PreCompoundModel.hh" 59 #include "G4PreCompoundModel.hh"
59 #include "G4HadronicInteractionRegistry.hh" 60 #include "G4HadronicInteractionRegistry.hh"
60 61
61 //....oooOO0OOooo........oooOO0OOooo........oo 62 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
62 63
63 G4MuMinusCapturePrecompound::G4MuMinusCaptureP 64 G4MuMinusCapturePrecompound::G4MuMinusCapturePrecompound(
64 G4VPreCompoundModel* ptr) 65 G4VPreCompoundModel* ptr)
65 : G4HadronicInteraction("muMinusNuclearCaptu 66 : G4HadronicInteraction("muMinusNuclearCapture")
66 { 67 {
67 fMuMass = G4MuonMinus::MuonMinus()->GetPDGMa 68 fMuMass = G4MuonMinus::MuonMinus()->GetPDGMass();
68 fProton = G4Proton::Proton(); 69 fProton = G4Proton::Proton();
69 fNeutron = G4Neutron::Neutron(); 70 fNeutron = G4Neutron::Neutron();
70 fThreshold = 10*MeV; 71 fThreshold = 10*MeV;
71 fTime = 0.0; 72 fTime = 0.0;
72 fPreCompound = ptr; 73 fPreCompound = ptr;
73 if(!ptr) { 74 if(!ptr) {
74 G4HadronicInteraction* p = 75 G4HadronicInteraction* p =
75 G4HadronicInteractionRegistry::Instance( 76 G4HadronicInteractionRegistry::Instance()->FindModel("PRECO");
76 ptr = static_cast<G4VPreCompoundModel*>(p) 77 ptr = static_cast<G4VPreCompoundModel*>(p);
77 fPreCompound = ptr; 78 fPreCompound = ptr;
78 if(!ptr) { fPreCompound = new G4PreCompoun 79 if(!ptr) { fPreCompound = new G4PreCompoundModel(); }
79 } 80 }
80 } 81 }
81 82
82 //....oooOO0OOooo........oooOO0OOooo........oo 83 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
83 84
84 G4MuMinusCapturePrecompound::~G4MuMinusCapture 85 G4MuMinusCapturePrecompound::~G4MuMinusCapturePrecompound()
85 { 86 {
86 result.Clear(); 87 result.Clear();
87 } 88 }
88 89
89 //....oooOO0OOooo........oooOO0OOooo........oo 90 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
90 91
91 G4HadFinalState* 92 G4HadFinalState*
92 G4MuMinusCapturePrecompound::ApplyYourself(con 93 G4MuMinusCapturePrecompound::ApplyYourself(const G4HadProjectile& projectile,
93 G4Nucleus& targetNucleus) 94 G4Nucleus& targetNucleus)
94 { 95 {
95 result.Clear(); 96 result.Clear();
96 result.SetStatusChange(stopAndKill); 97 result.SetStatusChange(stopAndKill);
97 fTime = projectile.GetGlobalTime(); 98 fTime = projectile.GetGlobalTime();
98 G4double time0 = fTime; 99 G4double time0 = fTime;
99 100
100 G4double muBindingEnergy = projectile.GetBou 101 G4double muBindingEnergy = projectile.GetBoundEnergy();
101 102
102 G4int Z = targetNucleus.GetZ_asInt(); 103 G4int Z = targetNucleus.GetZ_asInt();
103 G4int A = targetNucleus.GetA_asInt(); 104 G4int A = targetNucleus.GetA_asInt();
104 G4double massA = G4NucleiProperties::GetNucl 105 G4double massA = G4NucleiProperties::GetNuclearMass(A, Z);
105 106
106 /* 107 /*
107 G4cout << "G4MuMinusCapturePrecompound::Appl 108 G4cout << "G4MuMinusCapturePrecompound::ApplyYourself: Emu= "
108 << muBindingEnergy << G4endl; 109 << muBindingEnergy << G4endl;
109 */ 110 */
110 // Energy on K-shell 111 // Energy on K-shell
111 G4double muEnergy = fMuMass + muBindingEnerg 112 G4double muEnergy = fMuMass + muBindingEnergy;
112 G4double muMom =std::sqrt(muBindingEnergy*(m 113 G4double muMom =std::sqrt(muBindingEnergy*(muBindingEnergy + 2.0*fMuMass));
113 G4double availableEnergy = massA + fMuMass - 114 G4double availableEnergy = massA + fMuMass - muBindingEnergy;
114 G4double residualMass = G4NucleiProperties:: 115 G4double residualMass = G4NucleiProperties::GetNuclearMass(A, Z - 1);
115 116
116 G4ThreeVector vmu = muMom*G4RandomDirection( 117 G4ThreeVector vmu = muMom*G4RandomDirection();
117 G4LorentzVector aMuMom(vmu, muEnergy); 118 G4LorentzVector aMuMom(vmu, muEnergy);
118 119
119 const G4double nenergy = keV; 120 const G4double nenergy = keV;
120 121
121 // p or 3He as a target 122 // p or 3He as a target
122 // two body reaction mu- + A(Z,A) -> nuMu + 123 // two body reaction mu- + A(Z,A) -> nuMu + A(Z-1,A)
123 if((1 == Z && 1 == A) || (2 == Z && 3 == A)) 124 if((1 == Z && 1 == A) || (2 == Z && 3 == A)) {
124 125
125 const G4ParticleDefinition* pd = 0; 126 const G4ParticleDefinition* pd = 0;
126 if(1 == Z) { pd = fNeutron; } 127 if(1 == Z) { pd = fNeutron; }
127 else { pd = G4Triton::Triton(); } 128 else { pd = G4Triton::Triton(); }
128 129
129 // 130 //
130 // Computation in assumption of CM reacti 131 // Computation in assumption of CM reaction
131 // 132 //
132 G4double e = 0.5*(availableEnergy - 133 G4double e = 0.5*(availableEnergy -
133 residualMass*residualMass/availableE 134 residualMass*residualMass/availableEnergy);
134 135
135 G4ThreeVector nudir = G4RandomDirection(); 136 G4ThreeVector nudir = G4RandomDirection();
136 AddNewParticle(G4NeutrinoMu::NeutrinoMu(), 137 AddNewParticle(G4NeutrinoMu::NeutrinoMu(), nudir, e);
137 nudir *= -1.0; 138 nudir *= -1.0;
138 AddNewParticle(pd, nudir, availableEnergy 139 AddNewParticle(pd, nudir, availableEnergy - e - residualMass);
139 140
140 // d or 4He as a target 141 // d or 4He as a target
141 // three body reaction mu- + A(Z,A) -> nuMu 142 // three body reaction mu- + A(Z,A) -> nuMu + n + A(Z-1,A)
142 // extra neutron produced at rest 143 // extra neutron produced at rest
143 } else if((1 == Z && 2 == A) || (2 == Z && 4 144 } else if((1 == Z && 2 == A) || (2 == Z && 4 == A)) {
144 145
145 const G4ParticleDefinition* pd = 0; 146 const G4ParticleDefinition* pd = 0;
146 if(1 == Z) { pd = fNeutron; } 147 if(1 == Z) { pd = fNeutron; }
147 else { pd = G4Triton::Triton(); } 148 else { pd = G4Triton::Triton(); }
148 149
149 availableEnergy -= neutron_mass_c2 - nener 150 availableEnergy -= neutron_mass_c2 - nenergy;
150 residualMass = pd->GetPDGMass(); 151 residualMass = pd->GetPDGMass();
151 152
152 // 153 //
153 // Computation in assumption of CM reacti 154 // Computation in assumption of CM reaction
154 // 155 //
155 G4double e = 0.5*(availableEnergy - 156 G4double e = 0.5*(availableEnergy -
156 residualMass*residualMass/availableE 157 residualMass*residualMass/availableEnergy);
157 158
158 G4ThreeVector nudir = G4RandomDirection(); 159 G4ThreeVector nudir = G4RandomDirection();
159 AddNewParticle(G4NeutrinoMu::NeutrinoMu(), 160 AddNewParticle(G4NeutrinoMu::NeutrinoMu(), nudir, e);
160 nudir *= -1.0; 161 nudir *= -1.0;
161 AddNewParticle(pd, nudir, availableEnergy 162 AddNewParticle(pd, nudir, availableEnergy - e - residualMass);
162 163
163 // extra low-energy neutron 164 // extra low-energy neutron
164 nudir = G4RandomDirection(); 165 nudir = G4RandomDirection();
165 AddNewParticle(fNeutron, nudir, nenergy); 166 AddNewParticle(fNeutron, nudir, nenergy);
166 167
167 } else { 168 } else {
168 // sample mu- + p -> nuMu + n reaction in 169 // sample mu- + p -> nuMu + n reaction in CM of muonic atom
169 170
170 // nucleus 171 // nucleus
171 G4LorentzVector momInitial(0.0,0.0,0.0,ava 172 G4LorentzVector momInitial(0.0,0.0,0.0,availableEnergy);
172 G4LorentzVector momResidual, momNu; 173 G4LorentzVector momResidual, momNu;
173 174
174 // pick random proton inside nucleus 175 // pick random proton inside nucleus
175 G4double eEx; 176 G4double eEx;
176 fNucleus.Init(A, Z); 177 fNucleus.Init(A, Z);
177 const std::vector<G4Nucleon>& nucleons= fN 178 const std::vector<G4Nucleon>& nucleons= fNucleus.GetNucleons();
178 const G4ParticleDefinition* pDef; 179 const G4ParticleDefinition* pDef;
179 180
180 G4int reentryCount = 0; 181 G4int reentryCount = 0;
181 182
182 do { 183 do {
183 ++reentryCount; 184 ++reentryCount;
184 G4int index = 0; 185 G4int index = 0;
185 do { 186 do {
186 index=G4int(A*G4UniformRand()); 187 index=G4int(A*G4UniformRand());
187 pDef = nucleons[index].GetDefinition(); 188 pDef = nucleons[index].GetDefinition();
188 } while(pDef != fProton); 189 } while(pDef != fProton);
189 G4LorentzVector momP = nucleons[index].G 190 G4LorentzVector momP = nucleons[index].Get4Momentum();
190 191
191 // Get CMS kinematics 192 // Get CMS kinematics
192 G4LorentzVector theCMS = momP + aMuMom; 193 G4LorentzVector theCMS = momP + aMuMom;
193 G4ThreeVector bst = theCMS.boostVector() 194 G4ThreeVector bst = theCMS.boostVector();
194 195
195 G4double Ecms = theCMS.mag(); 196 G4double Ecms = theCMS.mag();
196 G4double Enu = 0.5*(Ecms - neutron_mass 197 G4double Enu = 0.5*(Ecms - neutron_mass_c2*neutron_mass_c2/Ecms);
197 eEx = 0.0; 198 eEx = 0.0;
198 199
199 if(Enu > 0.0) { 200 if(Enu > 0.0) {
200 // make the nu, and transform to lab; 201 // make the nu, and transform to lab;
201 momNu.set(Enu*G4RandomDirection(), Enu); 202 momNu.set(Enu*G4RandomDirection(), Enu);
202 203
203 // nu in lab. 204 // nu in lab.
204 momNu.boost(bst); 205 momNu.boost(bst);
205 momResidual = momInitial - momNu; 206 momResidual = momInitial - momNu;
206 eEx = momResidual.mag() - residualMass; 207 eEx = momResidual.mag() - residualMass;
207 if(eEx < 0.0 && eEx + nenergy >= 0.0) 208 if(eEx < 0.0 && eEx + nenergy >= 0.0) {
208 momResidual.set(0.0, 0.0, 0.0, resid 209 momResidual.set(0.0, 0.0, 0.0, residualMass);
209 eEx = 0.0; <<
210 } 210 }
211 } 211 }
212 // in the case of many iterations stop t <<
213 // with zero excitation energy <<
214 if(reentryCount > 100 && eEx < 0.0) { 212 if(reentryCount > 100 && eEx < 0.0) {
215 G4ExceptionDescription ed; 213 G4ExceptionDescription ed;
216 ed << "Call for " << GetModelName() << G4end 214 ed << "Call for " << GetModelName() << G4endl;
217 ed << "Target Z= " << Z 215 ed << "Target Z= " << Z
218 << " A= " << A << " Eex(MeV)= " << eEx/ 216 << " A= " << A << " Eex(MeV)= " << eEx/MeV << G4endl;
219 ed << " ApplyYourself does not completed aft 217 ed << " ApplyYourself does not completed after 100 attempts -"
220 << " excitation energy is set to zero"; 218 << " excitation energy is set to zero";
221 G4Exception("G4MuMinusCapturePrecompound::Ap 219 G4Exception("G4MuMinusCapturePrecompound::ApplyYourself", "had006",
222 JustWarning, ed); 220 JustWarning, ed);
223 momResidual.set(0.0, 0.0, 0.0, residualMass) 221 momResidual.set(0.0, 0.0, 0.0, residualMass);
224 eEx = 0.0; <<
225 } 222 }
226 // Loop checking, 06-Aug-2015, Vladimir <<
227 } while(eEx <= 0.0); 223 } while(eEx <= 0.0);
228 224
229 G4ThreeVector dir = momNu.vect().unit(); 225 G4ThreeVector dir = momNu.vect().unit();
230 AddNewParticle(G4NeutrinoMu::NeutrinoMu(), 226 AddNewParticle(G4NeutrinoMu::NeutrinoMu(), dir, momNu.e());
231 227
232 G4Fragment initialState(A, Z-1, momResidua 228 G4Fragment initialState(A, Z-1, momResidual);
233 initialState.SetNumberOfExcitedParticle(2, 229 initialState.SetNumberOfExcitedParticle(2,0);
234 initialState.SetNumberOfHoles(1,1); 230 initialState.SetNumberOfHoles(1,1);
235 231
236 // decay time for pre-compound/de-excitati 232 // decay time for pre-compound/de-excitation starts from zero
237 G4ReactionProductVector* rpv = fPreCompoun 233 G4ReactionProductVector* rpv = fPreCompound->DeExcite(initialState);
238 size_t n = rpv->size(); 234 size_t n = rpv->size();
239 for(size_t i=0; i<n; ++i) { 235 for(size_t i=0; i<n; ++i) {
240 G4ReactionProduct* rp = (*rpv)[i]; 236 G4ReactionProduct* rp = (*rpv)[i];
241 237
242 // reaction time 238 // reaction time
243 fTime = time0 + rp->GetTOF(); 239 fTime = time0 + rp->GetTOF();
244 G4ThreeVector direction = rp->GetMomentu 240 G4ThreeVector direction = rp->GetMomentum().unit();
245 AddNewParticle(rp->GetDefinition(), dire 241 AddNewParticle(rp->GetDefinition(), direction, rp->GetKineticEnergy());
246 delete rp; 242 delete rp;
247 } 243 }
248 delete rpv; 244 delete rpv;
249 } 245 }
250 if(verboseLevel > 1) 246 if(verboseLevel > 1)
251 G4cout << "G4MuMinusCapturePrecompound::Ap 247 G4cout << "G4MuMinusCapturePrecompound::ApplyYourself: Nsec= "
252 << result.GetNumberOfSecondaries() 248 << result.GetNumberOfSecondaries()
253 <<" E0(MeV)= " <<availableEnergy/MeV 249 <<" E0(MeV)= " <<availableEnergy/MeV
254 <<" Mres(GeV)= " <<residualMass/GeV 250 <<" Mres(GeV)= " <<residualMass/GeV
255 <<G4endl; 251 <<G4endl;
256 252
257 return &result; 253 return &result;
258 } 254 }
259 255
260 //....oooOO0OOooo........oooOO0OOooo........oo 256 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
261 257
262 void G4MuMinusCapturePrecompound::ModelDescrip 258 void G4MuMinusCapturePrecompound::ModelDescription(std::ostream& outFile) const
263 { 259 {
264 outFile << "Sampling of mu- capture by atomi 260 outFile << "Sampling of mu- capture by atomic nucleus from K-shell"
265 << " mesoatom orbit.\n" 261 << " mesoatom orbit.\n"
266 << "Primary reaction mu- + p -> n + neutri 262 << "Primary reaction mu- + p -> n + neutrino, neutron providing\n"
267 << " initial excitation of the target nuc 263 << " initial excitation of the target nucleus and PreCompound"
268 << " model samples final state\n"; 264 << " model samples final state\n";
269 } 265 }
270 266
271 //....oooOO0OOooo........oooOO0OOooo........oo 267 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
272 268