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>> 26 // $Id: G4MuMinusCapturePrecompound.cc 79215 2014-02-20 14:46:56Z 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 <<
121 // p or 3He as a target 120 // p or 3He as a target
122 // two body reaction mu- + A(Z,A) -> nuMu + 121 // two body reaction mu- + A(Z,A) -> nuMu + A(Z-1,A)
123 if((1 == Z && 1 == A) || (2 == Z && 3 == A)) 122 if((1 == Z && 1 == A) || (2 == Z && 3 == A)) {
124 123
125 const G4ParticleDefinition* pd = 0; << 124 G4ParticleDefinition* pd = 0;
126 if(1 == Z) { pd = fNeutron; } 125 if(1 == Z) { pd = fNeutron; }
127 else { pd = G4Triton::Triton(); } 126 else { pd = G4Triton::Triton(); }
128 127
129 // 128 //
130 // Computation in assumption of CM reacti 129 // Computation in assumption of CM reaction
131 // 130 //
132 G4double e = 0.5*(availableEnergy - 131 G4double e = 0.5*(availableEnergy -
133 residualMass*residualMass/availableE 132 residualMass*residualMass/availableEnergy);
134 133
135 G4ThreeVector nudir = G4RandomDirection(); 134 G4ThreeVector nudir = G4RandomDirection();
136 AddNewParticle(G4NeutrinoMu::NeutrinoMu(), 135 AddNewParticle(G4NeutrinoMu::NeutrinoMu(), nudir, e);
137 nudir *= -1.0; 136 nudir *= -1.0;
138 AddNewParticle(pd, nudir, availableEnergy 137 AddNewParticle(pd, nudir, availableEnergy - e - residualMass);
139 138
140 // d or 4He as a target <<
141 // three body reaction mu- + A(Z,A) -> nuMu <<
142 // extra neutron produced at rest <<
143 } else if((1 == Z && 2 == A) || (2 == Z && 4 <<
144 <<
145 const G4ParticleDefinition* pd = 0; <<
146 if(1 == Z) { pd = fNeutron; } <<
147 else { pd = G4Triton::Triton(); } <<
148 <<
149 availableEnergy -= neutron_mass_c2 - nener <<
150 residualMass = pd->GetPDGMass(); <<
151 <<
152 // <<
153 // Computation in assumption of CM reacti <<
154 // <<
155 G4double e = 0.5*(availableEnergy - <<
156 residualMass*residualMass/availableE <<
157 <<
158 G4ThreeVector nudir = G4RandomDirection(); <<
159 AddNewParticle(G4NeutrinoMu::NeutrinoMu(), <<
160 nudir *= -1.0; <<
161 AddNewParticle(pd, nudir, availableEnergy <<
162 <<
163 // extra low-energy neutron <<
164 nudir = G4RandomDirection(); <<
165 AddNewParticle(fNeutron, nudir, nenergy); <<
166 139
167 } else { 140 } else {
168 // sample mu- + p -> nuMu + n reaction in 141 // sample mu- + p -> nuMu + n reaction in CM of muonic atom
169 142
170 // nucleus 143 // nucleus
171 G4LorentzVector momInitial(0.0,0.0,0.0,ava 144 G4LorentzVector momInitial(0.0,0.0,0.0,availableEnergy);
172 G4LorentzVector momResidual, momNu; 145 G4LorentzVector momResidual, momNu;
173 146
174 // pick random proton inside nucleus 147 // pick random proton inside nucleus
175 G4double eEx; 148 G4double eEx;
176 fNucleus.Init(A, Z); 149 fNucleus.Init(A, Z);
177 const std::vector<G4Nucleon>& nucleons= fN 150 const std::vector<G4Nucleon>& nucleons= fNucleus.GetNucleons();
178 const G4ParticleDefinition* pDef; << 151 G4ParticleDefinition* pDef;
179 152
180 G4int reentryCount = 0; 153 G4int reentryCount = 0;
181 154
182 do { 155 do {
183 ++reentryCount; 156 ++reentryCount;
184 G4int index = 0; 157 G4int index = 0;
185 do { 158 do {
186 index=G4int(A*G4UniformRand()); 159 index=G4int(A*G4UniformRand());
187 pDef = nucleons[index].GetDefinition(); 160 pDef = nucleons[index].GetDefinition();
188 } while(pDef != fProton); 161 } while(pDef != fProton);
189 G4LorentzVector momP = nucleons[index].G 162 G4LorentzVector momP = nucleons[index].Get4Momentum();
190 163
191 // Get CMS kinematics 164 // Get CMS kinematics
192 G4LorentzVector theCMS = momP + aMuMom; 165 G4LorentzVector theCMS = momP + aMuMom;
193 G4ThreeVector bst = theCMS.boostVector() 166 G4ThreeVector bst = theCMS.boostVector();
194 167
195 G4double Ecms = theCMS.mag(); 168 G4double Ecms = theCMS.mag();
196 G4double Enu = 0.5*(Ecms - neutron_mass 169 G4double Enu = 0.5*(Ecms - neutron_mass_c2*neutron_mass_c2/Ecms);
197 eEx = 0.0; 170 eEx = 0.0;
198 171
199 if(Enu > 0.0) { 172 if(Enu > 0.0) {
200 // make the nu, and transform to lab; 173 // make the nu, and transform to lab;
201 momNu.set(Enu*G4RandomDirection(), Enu); 174 momNu.set(Enu*G4RandomDirection(), Enu);
202 175
203 // nu in lab. 176 // nu in lab.
204 momNu.boost(bst); 177 momNu.boost(bst);
205 momResidual = momInitial - momNu; 178 momResidual = momInitial - momNu;
206 eEx = momResidual.mag() - residualMass; 179 eEx = momResidual.mag() - residualMass;
207 if(eEx < 0.0 && eEx + nenergy >= 0.0) <<
208 momResidual.set(0.0, 0.0, 0.0, resid <<
209 eEx = 0.0; <<
210 } <<
211 } 180 }
212 // in the case of many iterations stop t << 181 if(reentryCount > 1000) {
213 // with zero excitation energy <<
214 if(reentryCount > 100 && eEx < 0.0) { <<
215 G4ExceptionDescription ed; 182 G4ExceptionDescription ed;
216 ed << "Call for " << GetModelName() << G4end 183 ed << "Call for " << GetModelName() << G4endl;
217 ed << "Target Z= " << Z 184 ed << "Target Z= " << Z
218 << " A= " << A << " Eex(MeV)= " << eEx/ 185 << " A= " << A << " Eex(MeV)= " << eEx/MeV << G4endl;
219 ed << " ApplyYourself does not completed aft << 186 ed << " ApplyYourself does not completed after 1000 attempts";
220 << " excitation energy is set to zero"; <<
221 G4Exception("G4MuMinusCapturePrecompound::Ap 187 G4Exception("G4MuMinusCapturePrecompound::ApplyYourself", "had006",
222 JustWarning, ed); << 188 FatalException, ed);
223 momResidual.set(0.0, 0.0, 0.0, residualMass) <<
224 eEx = 0.0; <<
225 } 189 }
226 // Loop checking, 06-Aug-2015, Vladimir <<
227 } while(eEx <= 0.0); 190 } while(eEx <= 0.0);
228 191
229 G4ThreeVector dir = momNu.vect().unit(); 192 G4ThreeVector dir = momNu.vect().unit();
230 AddNewParticle(G4NeutrinoMu::NeutrinoMu(), 193 AddNewParticle(G4NeutrinoMu::NeutrinoMu(), dir, momNu.e());
231 194
232 G4Fragment initialState(A, Z-1, momResidua 195 G4Fragment initialState(A, Z-1, momResidual);
233 initialState.SetNumberOfExcitedParticle(2, 196 initialState.SetNumberOfExcitedParticle(2,0);
234 initialState.SetNumberOfHoles(1,1); 197 initialState.SetNumberOfHoles(1,1);
235 198
236 // decay time for pre-compound/de-excitati 199 // decay time for pre-compound/de-excitation starts from zero
237 G4ReactionProductVector* rpv = fPreCompoun 200 G4ReactionProductVector* rpv = fPreCompound->DeExcite(initialState);
238 size_t n = rpv->size(); 201 size_t n = rpv->size();
239 for(size_t i=0; i<n; ++i) { 202 for(size_t i=0; i<n; ++i) {
240 G4ReactionProduct* rp = (*rpv)[i]; 203 G4ReactionProduct* rp = (*rpv)[i];
241 204
242 // reaction time 205 // reaction time
243 fTime = time0 + rp->GetTOF(); 206 fTime = time0 + rp->GetTOF();
244 G4ThreeVector direction = rp->GetMomentu 207 G4ThreeVector direction = rp->GetMomentum().unit();
245 AddNewParticle(rp->GetDefinition(), dire 208 AddNewParticle(rp->GetDefinition(), direction, rp->GetKineticEnergy());
246 delete rp; 209 delete rp;
247 } 210 }
248 delete rpv; 211 delete rpv;
249 } 212 }
250 if(verboseLevel > 1) 213 if(verboseLevel > 1)
251 G4cout << "G4MuMinusCapturePrecompound::Ap 214 G4cout << "G4MuMinusCapturePrecompound::ApplyYourself: Nsec= "
252 << result.GetNumberOfSecondaries() 215 << result.GetNumberOfSecondaries()
253 <<" E0(MeV)= " <<availableEnergy/MeV 216 <<" E0(MeV)= " <<availableEnergy/MeV
254 <<" Mres(GeV)= " <<residualMass/GeV 217 <<" Mres(GeV)= " <<residualMass/GeV
255 <<G4endl; 218 <<G4endl;
256 219
257 return &result; 220 return &result;
258 } 221 }
259 222
260 //....oooOO0OOooo........oooOO0OOooo........oo 223 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
261 224
262 void G4MuMinusCapturePrecompound::ModelDescrip 225 void G4MuMinusCapturePrecompound::ModelDescription(std::ostream& outFile) const
263 { 226 {
264 outFile << "Sampling of mu- capture by atomi 227 outFile << "Sampling of mu- capture by atomic nucleus from K-shell"
265 << " mesoatom orbit.\n" 228 << " mesoatom orbit.\n"
266 << "Primary reaction mu- + p -> n + neutri 229 << "Primary reaction mu- + p -> n + neutrino, neutron providing\n"
267 << " initial excitation of the target nuc 230 << " initial excitation of the target nucleus and PreCompound"
268 << " model samples final state\n"; 231 << " model samples final state\n";
269 } 232 }
270 233
271 //....oooOO0OOooo........oooOO0OOooo........oo 234 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
272 235