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>> 26 // $Id$
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 fPreCompound = ptr; 72 fPreCompound = ptr;
73 if(!ptr) { 73 if(!ptr) {
74 G4HadronicInteraction* p = 74 G4HadronicInteraction* p =
75 G4HadronicInteractionRegistry::Instance( 75 G4HadronicInteractionRegistry::Instance()->FindModel("PRECO");
76 ptr = static_cast<G4VPreCompoundModel*>(p) 76 ptr = static_cast<G4VPreCompoundModel*>(p);
77 fPreCompound = ptr; 77 fPreCompound = ptr;
78 if(!ptr) { fPreCompound = new G4PreCompoun 78 if(!ptr) { fPreCompound = new G4PreCompoundModel(); }
79 } 79 }
80 } 80 }
81 81
82 //....oooOO0OOooo........oooOO0OOooo........oo 82 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
83 83
84 G4MuMinusCapturePrecompound::~G4MuMinusCapture 84 G4MuMinusCapturePrecompound::~G4MuMinusCapturePrecompound()
85 { 85 {
86 result.Clear(); 86 result.Clear();
87 } 87 }
88 88
89 //....oooOO0OOooo........oooOO0OOooo........oo 89 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
90 90
91 G4HadFinalState* 91 G4HadFinalState*
92 G4MuMinusCapturePrecompound::ApplyYourself(con 92 G4MuMinusCapturePrecompound::ApplyYourself(const G4HadProjectile& projectile,
93 G4Nucleus& targetNucleus) 93 G4Nucleus& targetNucleus)
94 { 94 {
95 result.Clear(); 95 result.Clear();
96 result.SetStatusChange(stopAndKill); 96 result.SetStatusChange(stopAndKill);
97 fTime = projectile.GetGlobalTime(); 97 fTime = projectile.GetGlobalTime();
98 G4double time0 = fTime; 98 G4double time0 = fTime;
99 99
100 G4double muBindingEnergy = projectile.GetBou 100 G4double muBindingEnergy = projectile.GetBoundEnergy();
101 101
102 G4int Z = targetNucleus.GetZ_asInt(); 102 G4int Z = targetNucleus.GetZ_asInt();
103 G4int A = targetNucleus.GetA_asInt(); 103 G4int A = targetNucleus.GetA_asInt();
104 G4double massA = G4NucleiProperties::GetNucl 104 G4double massA = G4NucleiProperties::GetNuclearMass(A, Z);
105 105
106 /* 106 /*
107 G4cout << "G4MuMinusCapturePrecompound::Appl 107 G4cout << "G4MuMinusCapturePrecompound::ApplyYourself: Emu= "
108 << muBindingEnergy << G4endl; 108 << muBindingEnergy << G4endl;
109 */ 109 */
110 // Energy on K-shell 110 // Energy on K-shell
111 G4double muEnergy = fMuMass + muBindingEnerg 111 G4double muEnergy = fMuMass + muBindingEnergy;
112 G4double muMom =std::sqrt(muBindingEnergy*(m << 112 G4double muMom = std::sqrt(muBindingEnergy*(muBindingEnergy + 2.0*fMuMass));
113 G4double availableEnergy = massA + fMuMass - 113 G4double availableEnergy = massA + fMuMass - muBindingEnergy;
114 G4double residualMass = G4NucleiProperties:: 114 G4double residualMass = G4NucleiProperties::GetNuclearMass(A, Z - 1);
115 115
116 G4ThreeVector vmu = muMom*G4RandomDirection( 116 G4ThreeVector vmu = muMom*G4RandomDirection();
117 G4LorentzVector aMuMom(vmu, muEnergy); 117 G4LorentzVector aMuMom(vmu, muEnergy);
118 118
119 const G4double nenergy = keV; <<
120 <<
121 // p or 3He as a target 119 // p or 3He as a target
122 // two body reaction mu- + A(Z,A) -> nuMu + 120 // two body reaction mu- + A(Z,A) -> nuMu + A(Z-1,A)
123 if((1 == Z && 1 == A) || (2 == Z && 3 == A)) 121 if((1 == Z && 1 == A) || (2 == Z && 3 == A)) {
124 122
125 const G4ParticleDefinition* pd = 0; << 123 G4ParticleDefinition* pd = 0;
126 if(1 == Z) { pd = fNeutron; } 124 if(1 == Z) { pd = fNeutron; }
127 else { pd = G4Triton::Triton(); } 125 else { pd = G4Triton::Triton(); }
128 126
129 // 127 //
130 // Computation in assumption of CM reacti 128 // Computation in assumption of CM reaction
131 // 129 //
132 G4double e = 0.5*(availableEnergy - 130 G4double e = 0.5*(availableEnergy -
133 residualMass*residualMass/availableE 131 residualMass*residualMass/availableEnergy);
134 132
135 G4ThreeVector nudir = G4RandomDirection(); 133 G4ThreeVector nudir = G4RandomDirection();
136 AddNewParticle(G4NeutrinoMu::NeutrinoMu(), 134 AddNewParticle(G4NeutrinoMu::NeutrinoMu(), nudir, e);
137 nudir *= -1.0; 135 nudir *= -1.0;
138 AddNewParticle(pd, nudir, availableEnergy 136 AddNewParticle(pd, nudir, availableEnergy - e - residualMass);
139 137
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); <<
166 138
167 } else { 139 } else {
168 // sample mu- + p -> nuMu + n reaction in 140 // sample mu- + p -> nuMu + n reaction in CM of muonic atom
169 141
>> 142 // muon
>> 143 //
>> 144 // NOTE by K.Genser and J.Yarba:
>> 145 // The code below isn't working because emu always turns smaller than fMuMass
>> 146 // For this reason the sqrt is producing a NaN
>> 147 //
>> 148 // G4double emu = (availableEnergy*availableEnergy - massA*massA
>> 149 // + fMuMass*fMuMass)/(2*availableEnergy);
>> 150 // G4ThreeVector mudir = G4RandomDirection();
>> 151 // G4LorentzVector momMuon(std::sqrt(emu*emu - fMuMass*fMuMass)*mudir, emu);
>> 152
170 // nucleus 153 // nucleus
171 G4LorentzVector momInitial(0.0,0.0,0.0,ava 154 G4LorentzVector momInitial(0.0,0.0,0.0,availableEnergy);
172 G4LorentzVector momResidual, momNu; 155 G4LorentzVector momResidual, momNu;
173 156
174 // pick random proton inside nucleus 157 // pick random proton inside nucleus
175 G4double eEx; 158 G4double eEx;
176 fNucleus.Init(A, Z); 159 fNucleus.Init(A, Z);
177 const std::vector<G4Nucleon>& nucleons= fN 160 const std::vector<G4Nucleon>& nucleons= fNucleus.GetNucleons();
178 const G4ParticleDefinition* pDef; << 161 G4ParticleDefinition* pDef;
179 162
>> 163 G4int nneutrons = 1;
180 G4int reentryCount = 0; 164 G4int reentryCount = 0;
181 165
182 do { 166 do {
183 ++reentryCount; 167 ++reentryCount;
184 G4int index = 0; 168 G4int index = 0;
185 do { 169 do {
186 index=G4int(A*G4UniformRand()); 170 index=G4int(A*G4UniformRand());
187 pDef = nucleons[index].GetDefinition(); 171 pDef = nucleons[index].GetDefinition();
188 } while(pDef != fProton); 172 } while(pDef != fProton);
189 G4LorentzVector momP = nucleons[index].G 173 G4LorentzVector momP = nucleons[index].Get4Momentum();
190 174
191 // Get CMS kinematics 175 // Get CMS kinematics
192 G4LorentzVector theCMS = momP + aMuMom; 176 G4LorentzVector theCMS = momP + aMuMom;
193 G4ThreeVector bst = theCMS.boostVector() 177 G4ThreeVector bst = theCMS.boostVector();
194 178
195 G4double Ecms = theCMS.mag(); 179 G4double Ecms = theCMS.mag();
196 G4double Enu = 0.5*(Ecms - neutron_mass 180 G4double Enu = 0.5*(Ecms - neutron_mass_c2*neutron_mass_c2/Ecms);
197 eEx = 0.0; 181 eEx = 0.0;
198 182
199 if(Enu > 0.0) { 183 if(Enu > 0.0) {
200 // make the nu, and transform to lab; 184 // make the nu, and transform to lab;
201 momNu.set(Enu*G4RandomDirection(), Enu); 185 momNu.set(Enu*G4RandomDirection(), Enu);
202 186
203 // nu in lab. 187 // nu in lab.
204 momNu.boost(bst); 188 momNu.boost(bst);
205 momResidual = momInitial - momNu; 189 momResidual = momInitial - momNu;
206 eEx = momResidual.mag() - residualMass; 190 eEx = momResidual.mag() - residualMass;
207 if(eEx < 0.0 && eEx + nenergy >= 0.0) << 191
208 momResidual.set(0.0, 0.0, 0.0, resid << 192 // release neutron
209 eEx = 0.0; << 193
>> 194 if(eEx > 0.0) {
>> 195 G4double eth = residualMass - massA + fThreshold + 2*neutron_mass_c2;
>> 196 if(Ecms - Enu > eth) {
>> 197 theCMS -= momNu;
>> 198 G4double ekin = theCMS.e() - eth;
>> 199 G4ThreeVector dir = theCMS.vect().unit();
>> 200 AddNewParticle(fNeutron, dir, ekin);
>> 201 momResidual -=
>> 202 result.GetSecondary(0)->GetParticle()->Get4Momentum();
>> 203 --Z;
>> 204 --A;
>> 205 residualMass = G4NucleiProperties::GetNuclearMass(A, Z);
>> 206 nneutrons = 0;
>> 207 }
210 } 208 }
211 } 209 }
212 // in the case of many iterations stop t << 210 if(Enu <= 0.0 && eEx <= 0.0 && reentryCount > 100) {
213 // with zero excitation energy <<
214 if(reentryCount > 100 && eEx < 0.0) { <<
215 G4ExceptionDescription ed; 211 G4ExceptionDescription ed;
216 ed << "Call for " << GetModelName() << G4end 212 ed << "Call for " << GetModelName() << G4endl;
217 ed << "Target Z= " << Z 213 ed << "Target Z= " << Z
218 << " A= " << A << " Eex(MeV)= " << eEx/ << 214 << " A= " << A << G4endl;
219 ed << " ApplyYourself does not completed aft << 215 ed << " ApplyYourself does not completed after 100 attempts" << G4endl;
220 << " excitation energy is set to zero"; << 216 G4Exception("G4MuMinusCapturePrecompound::AtRestDoIt", "had006",
221 G4Exception("G4MuMinusCapturePrecompound::Ap << 217 FatalException, ed);
222 JustWarning, ed); <<
223 momResidual.set(0.0, 0.0, 0.0, residualMass) <<
224 eEx = 0.0; <<
225 } 218 }
226 // Loop checking, 06-Aug-2015, Vladimir <<
227 } while(eEx <= 0.0); 219 } while(eEx <= 0.0);
228 220
229 G4ThreeVector dir = momNu.vect().unit(); 221 G4ThreeVector dir = momNu.vect().unit();
230 AddNewParticle(G4NeutrinoMu::NeutrinoMu(), 222 AddNewParticle(G4NeutrinoMu::NeutrinoMu(), dir, momNu.e());
231 223
232 G4Fragment initialState(A, Z-1, momResidua << 224 G4Fragment initialState(A, Z, momResidual);
233 initialState.SetNumberOfExcitedParticle(2, << 225 initialState.SetNumberOfExcitedParticle(nneutrons,0);
234 initialState.SetNumberOfHoles(1,1); 226 initialState.SetNumberOfHoles(1,1);
235 227
236 // decay time for pre-compound/de-excitati 228 // decay time for pre-compound/de-excitation starts from zero
237 G4ReactionProductVector* rpv = fPreCompoun 229 G4ReactionProductVector* rpv = fPreCompound->DeExcite(initialState);
238 size_t n = rpv->size(); 230 size_t n = rpv->size();
239 for(size_t i=0; i<n; ++i) { 231 for(size_t i=0; i<n; ++i) {
240 G4ReactionProduct* rp = (*rpv)[i]; 232 G4ReactionProduct* rp = (*rpv)[i];
241 233
242 // reaction time 234 // reaction time
243 fTime = time0 + rp->GetTOF(); 235 fTime = time0 + rp->GetTOF();
244 G4ThreeVector direction = rp->GetMomentu 236 G4ThreeVector direction = rp->GetMomentum().unit();
245 AddNewParticle(rp->GetDefinition(), dire 237 AddNewParticle(rp->GetDefinition(), direction, rp->GetKineticEnergy());
246 delete rp; 238 delete rp;
247 } 239 }
248 delete rpv; 240 delete rpv;
249 } 241 }
250 if(verboseLevel > 1) 242 if(verboseLevel > 1)
251 G4cout << "G4MuMinusCapturePrecompound::Ap 243 G4cout << "G4MuMinusCapturePrecompound::ApplyYourself: Nsec= "
252 << result.GetNumberOfSecondaries() 244 << result.GetNumberOfSecondaries()
253 <<" E0(MeV)= " <<availableEnergy/MeV 245 <<" E0(MeV)= " <<availableEnergy/MeV
254 <<" Mres(GeV)= " <<residualMass/GeV 246 <<" Mres(GeV)= " <<residualMass/GeV
255 <<G4endl; 247 <<G4endl;
256 248
257 return &result; 249 return &result;
258 } 250 }
259 251
260 //....oooOO0OOooo........oooOO0OOooo........oo 252 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
261 253
262 void G4MuMinusCapturePrecompound::ModelDescrip 254 void G4MuMinusCapturePrecompound::ModelDescription(std::ostream& outFile) const
263 { 255 {
264 outFile << "Sampling of mu- capture by atomi 256 outFile << "Sampling of mu- capture by atomic nucleus from K-shell"
265 << " mesoatom orbit.\n" 257 << " mesoatom orbit.\n"
266 << "Primary reaction mu- + p -> n + neutri 258 << "Primary reaction mu- + p -> n + neutrino, neutron providing\n"
267 << " initial excitation of the target nuc 259 << " initial excitation of the target nucleus and PreCompound"
268 << " model samples final state\n"; 260 << " model samples final state\n";
269 } 261 }
270 262
271 //....oooOO0OOooo........oooOO0OOooo........oo 263 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
272 264