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Geant4/processes/hadronic/models/radioactive_decay/src/G4BetaMinusDecay.cc

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Differences between /processes/hadronic/models/radioactive_decay/src/G4BetaMinusDecay.cc (Version 11.3.0) and /processes/hadronic/models/radioactive_decay/src/G4BetaMinusDecay.cc (Version 11.2)


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 27 //                                                 27 //                                                                            //
 28 //  File:   G4BetaMinusDecay.cc                    28 //  File:   G4BetaMinusDecay.cc                                               //
 29 //  Author: D.H. Wright (SLAC)                     29 //  Author: D.H. Wright (SLAC)                                                //
 30 //  Date:   25 October 2014                        30 //  Date:   25 October 2014                                                   //
 31 //  Modifications:                                 31 //  Modifications:                                                            //
 32 //    23.08.2023 V.Ivanchenko make it thread s     32 //    23.08.2023 V.Ivanchenko make it thread safe using static utility        //
 33 //                                                 33 //                                                                            //
 34 //////////////////////////////////////////////     34 ////////////////////////////////////////////////////////////////////////////////
 35                                                    35 
 36 #include "G4BetaMinusDecay.hh"                     36 #include "G4BetaMinusDecay.hh"
 37 #include "G4BetaDecayCorrections.hh"               37 #include "G4BetaDecayCorrections.hh"
 38 #include "G4ThreeVector.hh"                        38 #include "G4ThreeVector.hh"
 39 #include "G4LorentzVector.hh"                      39 #include "G4LorentzVector.hh"
 40 #include "G4DynamicParticle.hh"                    40 #include "G4DynamicParticle.hh"
 41 #include "G4DecayProducts.hh"                      41 #include "G4DecayProducts.hh"
 42 #include "G4PhysicalConstants.hh"                  42 #include "G4PhysicalConstants.hh"
 43 #include "G4SystemOfUnits.hh"                      43 #include "G4SystemOfUnits.hh"
 44 #include "G4Electron.hh"                           44 #include "G4Electron.hh"
 45 #include "G4AntiNeutrinoE.hh"                      45 #include "G4AntiNeutrinoE.hh"
 46 #include "G4RandomDirection.hh"                    46 #include "G4RandomDirection.hh"
 47 #include "G4BetaSpectrumSampler.hh"                47 #include "G4BetaSpectrumSampler.hh"
 48 #include <iostream>                                48 #include <iostream>
 49 #include <iomanip>                                 49 #include <iomanip>
 50                                                    50 
 51 namespace {                                        51 namespace {
 52   const G4double eMass = CLHEP::electron_mass_     52   const G4double eMass = CLHEP::electron_mass_c2;
 53 }                                                  53 }
 54                                                    54 
 55 G4BetaMinusDecay::G4BetaMinusDecay(const G4Par     55 G4BetaMinusDecay::G4BetaMinusDecay(const G4ParticleDefinition* theParentNucleus,
 56                                    const G4dou     56                                    const G4double& branch, const G4double& e0,
 57                                    const G4dou     57                                    const G4double& excitationE,
 58                                    const G4Ion     58                                    const G4Ions::G4FloatLevelBase& flb,
 59                                    const G4Bet     59                                    const G4BetaDecayType& betaType)
 60  : G4NuclearDecay("beta- decay", BetaMinus, ex     60  : G4NuclearDecay("beta- decay", BetaMinus, excitationE, flb),
 61    maxEnergy(e0/eMass),                        <<  61    maxEnergy(e0),
 62    estep(maxEnergy/(G4double)(npti - 1))           62    estep(maxEnergy/(G4double)(npti - 1))
 63 {                                                  63 {
 64   SetParent(theParentNucleus);  // Store name      64   SetParent(theParentNucleus);  // Store name of parent nucleus, delete G4MT_parent 
 65   SetBR(branch);                                   65   SetBR(branch);
 66   SetNumberOfDaughters(3);                         66   SetNumberOfDaughters(3);
 67                                                    67 
 68   fPrimaryIon = theParentNucleus;                  68   fPrimaryIon = theParentNucleus;
 69   fLepton = G4Electron::Electron();                69   fLepton = G4Electron::Electron();
 70   fNeutrino = G4AntiNeutrinoE::AntiNeutrinoE()     70   fNeutrino = G4AntiNeutrinoE::AntiNeutrinoE();
 71                                                    71 
 72   G4IonTable* theIonTable = G4ParticleTable::G     72   G4IonTable* theIonTable = G4ParticleTable::GetParticleTable()->GetIonTable();
 73   G4int daughterZ = theParentNucleus->GetAtomi     73   G4int daughterZ = theParentNucleus->GetAtomicNumber() + 1;
 74   G4int daughterA = theParentNucleus->GetAtomi     74   G4int daughterA = theParentNucleus->GetAtomicMass();
 75   fResIon = const_cast<const G4ParticleDefinit     75   fResIon = const_cast<const G4ParticleDefinition*>(theIonTable->GetIon(daughterZ, daughterA,
 76                                                    76                                                                         excitationE, flb));
 77   parentMass = theParentNucleus->GetPDGMass();     77   parentMass = theParentNucleus->GetPDGMass();
 78   resMass = fResIon->GetPDGMass();                 78   resMass = fResIon->GetPDGMass();
 79                                                    79 
 80   SetUpBetaSpectrumSampler(daughterZ, daughter     80   SetUpBetaSpectrumSampler(daughterZ, daughterA, betaType);
 81                                                    81 
 82   SetDaughter(0, fResIon);                         82   SetDaughter(0, fResIon);
 83   SetDaughter(1, fLepton);                         83   SetDaughter(1, fLepton);
 84   SetDaughter(2, fNeutrino);                       84   SetDaughter(2, fNeutrino);
 85                                                    85 
 86   // Fill G4MT_parent with theParentNucleus (s     86   // Fill G4MT_parent with theParentNucleus (stored by SetParent in ctor)  
 87   CheckAndFillParent();                            87   CheckAndFillParent();
 88                                                    88 
 89   // Fill G4MT_daughters with e-, nu and resid     89   // Fill G4MT_daughters with e-, nu and residual nucleus (stored by SetDaughter)  
 90   CheckAndFillDaughters();                         90   CheckAndFillDaughters();
 91 }                                                  91 }
 92                                                    92 
 93 G4DecayProducts* G4BetaMinusDecay::DecayIt(G4d     93 G4DecayProducts* G4BetaMinusDecay::DecayIt(G4double)
 94 {                                                  94 {
 95   // Set up final state                            95   // Set up final state
 96   // parentParticle is set at rest here becaus     96   // parentParticle is set at rest here because boost with correct momentum 
 97   // is done later                                 97   // is done later
 98   G4DynamicParticle prim(fPrimaryIon, G4ThreeV     98   G4DynamicParticle prim(fPrimaryIon, G4ThreeVector(0,0,1), 0.0);
 99   G4DecayProducts* products = new G4DecayProdu     99   G4DecayProducts* products = new G4DecayProducts(prim);
100                                                   100 
101   // Generate electron isotropic in angle, wit << 101   // Generate positron isotropic in angle, with energy from stored spectrum
102   const G4double eKE = eMass*G4BetaSpectrumSam    102   const G4double eKE = eMass*G4BetaSpectrumSampler::shoot(npti, cdf, estep);
103                                                   103 
104   G4double eMomentum = std::sqrt(eKE*(eKE + 2.    104   G4double eMomentum = std::sqrt(eKE*(eKE + 2.*eMass));
105   G4ThreeVector dir = G4RandomDirection();        105   G4ThreeVector dir = G4RandomDirection();
106   G4DynamicParticle* dp = new G4DynamicParticl    106   G4DynamicParticle* dp = new G4DynamicParticle(fLepton, dir, eKE);
107   products->PushProducts(dp);                     107   products->PushProducts(dp);
108   /*                                              108   /*
109   G4cout << "G4BetaPlusDecay::DecayIt: " << fP    109   G4cout << "G4BetaPlusDecay::DecayIt: " << fPrimaryIon->GetParticleName() 
110    << " -> " << fResIon->GetParticleName() <<     110    << " -> " << fResIon->GetParticleName() << " + " << fLepton->GetParticleName()
111    << " + " << fNeutrino->GetParticleName() <<    111    << " + " << fNeutrino->GetParticleName() << " Ee(MeV)=" << eKE
112          << G4endl;                               112          << G4endl;
113   */                                              113   */
                                                   >> 114   // Fill G4MT_parent with theParentNucleus (stored by SetParent in ctor)  
114                                                   115 
115   // 4-momentum of residual ion and neutrino      116   // 4-momentum of residual ion and neutrino
116   G4LorentzVector lv(-eMomentum*dir.x(), -eMom    117   G4LorentzVector lv(-eMomentum*dir.x(), -eMomentum*dir.y(), -eMomentum*dir.z(),
117                      parentMass - eKE - eMass)    118                      parentMass - eKE - eMass);
118                                                   119 
119   // centrum of mass system                    << 120   G4double edel =  std::max(lv.e() - resMass, 0.0);
120   G4double M = lv.mag();                       << 121   if (edel > CLHEP::eV) {
121   const G4double elim = CLHEP::eV;             << 122 
122   G4double edel = M - resMass;                 << 123     // centrum of mass system
123   // Free energy should be above limit         << 124     G4double M = lv.mag();
124   if (edel >= elim) {                          << 125 
125     // neutrino                                   126     // neutrino
126     G4double eNu = 0.5*(M - resMass*resMass/M)    127     G4double eNu = 0.5*(M - resMass*resMass/M);
127     G4LorentzVector lvnu(eNu*G4RandomDirection    128     G4LorentzVector lvnu(eNu*G4RandomDirection(), eNu);
128     lvnu.boost(lv.boostVector());                 129     lvnu.boost(lv.boostVector());
129     dir = lvnu.vect().unit();                     130     dir = lvnu.vect().unit();
130     dp = new G4DynamicParticle(fNeutrino, dir,    131     dp = new G4DynamicParticle(fNeutrino, dir, lvnu.e());
131     products->PushProducts(dp);                   132     products->PushProducts(dp);
132                                                   133 
133     // residual                                   134     // residual
134     lv -= lvnu;                                   135     lv -= lvnu;
135     dir = lv.vect().unit();                       136     dir = lv.vect().unit();
136     G4double ekin = std::max(lv.e() - resMass,    137     G4double ekin = std::max(lv.e() - resMass, 0.0);
137     dp = new G4DynamicParticle(fResIon, dir, e    138     dp = new G4DynamicParticle(fResIon, dir, ekin);
138     products->PushProducts(dp);                   139     products->PushProducts(dp);
139                                                   140 
140   } else {                                        141   } else {
141     // neglecting relativistic kinematic and g << 142     // neglecting relativistic kinematic and giving all energy to neutrino
142     dp = new G4DynamicParticle(fNeutrino, G4Ra << 143     dp = new G4DynamicParticle(fNeutrino, G4RandomDirection(), edel);
143     products->PushProducts(dp);                   144     products->PushProducts(dp);
144     dp = new G4DynamicParticle(fResIon, G4Thre    145     dp = new G4DynamicParticle(fResIon, G4ThreeVector(0.0,0.0,1.0), 0.0);
145     products->PushProducts(dp);                   146     products->PushProducts(dp);
146   }                                               147   }
147                                                   148 
148   return products;                                149   return products;
149 }                                                 150 }
150                                                   151 
151                                                   152 
152 void                                              153 void
153 G4BetaMinusDecay::SetUpBetaSpectrumSampler(con    154 G4BetaMinusDecay::SetUpBetaSpectrumSampler(const G4int& daughterZ,
154                                            con    155                                            const G4int& daughterA,
155                                            con    156                                            const G4BetaDecayType& betaType)
156 {                                                 157 {
157   cdf[0] = 0.0;                                   158   cdf[0] = 0.0;
158                                                   159 
159   // Check for cases in which Q < 0            << 160   // Check for cases in which Q < 2Me (e.g. z67.a162) 
160   if (maxEnergy > 0.) {                           161   if (maxEnergy > 0.) {
161     G4BetaDecayCorrections corrections(daughte    162     G4BetaDecayCorrections corrections(daughterZ, daughterA);
162                                                   163 
163     // Fill array to store cumulative spectrum    164     // Fill array to store cumulative spectrum
164     G4double ex;  // Kinetic energy normalized << 165     G4double ex;
165     G4double p;   // Momentum in units of elec << 166     G4double p;   // Positron momentum in units of electron mass
166     G4double f;   // Spectral shape function      167     G4double f;   // Spectral shape function
167     G4double f0 = 0.0;                         << 
168     G4double sum = 0.0;                           168     G4double sum = 0.0;
169     for (G4int i = 1; i < npti-1; ++i) {       << 169     for (G4int i = 1; i < npti; ++i) {
170       ex = estep*i;                               170       ex = estep*i;
171       p = std::sqrt(ex*(ex + 2.));                171       p = std::sqrt(ex*(ex + 2.));
172       f = p*(1. + ex)*(maxEnergy - ex)*(maxEne    172       f = p*(1. + ex)*(maxEnergy - ex)*(maxEnergy - ex);
173                                                   173 
174       // Apply Fermi factor to get allowed sha    174       // Apply Fermi factor to get allowed shape
175       f *= corrections.FermiFunction(1. + ex);    175       f *= corrections.FermiFunction(1. + ex);
176                                                   176 
177       // Apply shape factor for forbidden tran    177       // Apply shape factor for forbidden transitions
178       f *= corrections.ShapeFactor(betaType, p    178       f *= corrections.ShapeFactor(betaType, p, maxEnergy - ex);
179       sum += f + f0;                           << 179       sum += f;
180       cdf[i] = sum;                               180       cdf[i] = sum;
181       f0 = f;                                  << 
182     }                                             181     }
183     cdf[npti-1] = sum + f0;                    << 
184   } else {                                        182   } else {
185     for (G4int i = 1; i < npti; ++i) { cdf[i]     183     for (G4int i = 1; i < npti; ++i) { cdf[i] = 0.0; }
186   }                                               184   }
187 }                                                 185 }
188                                                   186 
189                                                   187 
190 void G4BetaMinusDecay::DumpNuclearInfo()          188 void G4BetaMinusDecay::DumpNuclearInfo()
191 {                                                 189 {
192   G4cout << " G4BetaMinusDecay  " << fPrimaryI    190   G4cout << " G4BetaMinusDecay  " << fPrimaryIon->GetParticleName()
193    << " -> " << fResIon->GetParticleName() <<     191    << " -> " << fResIon->GetParticleName() << " + " << fLepton->GetParticleName()
194    << " + " << fNeutrino->GetParticleName() <<    192    << " + " << fNeutrino->GetParticleName() << " Eemax(MeV)="
195    << maxEnergy*eMass << " BR=" << GetBR() <<     193    << maxEnergy*eMass << " BR=" << GetBR() << "%" << G4endl;
196 }                                                 194 }
197                                                   195 
198                                                   196