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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 ////////////////////////////////////////////// 26 //////////////////////////////////////////////////////////////////////////////// 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/eMass), 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 electron 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 */ 114 114 115 // 4-momentum of residual ion and neutrino 115 // 4-momentum of residual ion and neutrino 116 G4LorentzVector lv(-eMomentum*dir.x(), -eMom 116 G4LorentzVector lv(-eMomentum*dir.x(), -eMomentum*dir.y(), -eMomentum*dir.z(), 117 parentMass - eKE - eMass) 117 parentMass - eKE - eMass); 118 118 119 // centrum of mass system 119 // centrum of mass system 120 G4double M = lv.mag(); 120 G4double M = lv.mag(); 121 const G4double elim = CLHEP::eV; 121 const G4double elim = CLHEP::eV; 122 G4double edel = M - resMass; 122 G4double edel = M - resMass; 123 // Free energy should be above limit 123 // Free energy should be above limit 124 if (edel >= elim) { 124 if (edel >= elim) { 125 // neutrino 125 // neutrino 126 G4double eNu = 0.5*(M - resMass*resMass/M) 126 G4double eNu = 0.5*(M - resMass*resMass/M); 127 G4LorentzVector lvnu(eNu*G4RandomDirection 127 G4LorentzVector lvnu(eNu*G4RandomDirection(), eNu); 128 lvnu.boost(lv.boostVector()); 128 lvnu.boost(lv.boostVector()); 129 dir = lvnu.vect().unit(); 129 dir = lvnu.vect().unit(); 130 dp = new G4DynamicParticle(fNeutrino, dir, 130 dp = new G4DynamicParticle(fNeutrino, dir, lvnu.e()); 131 products->PushProducts(dp); 131 products->PushProducts(dp); 132 132 133 // residual 133 // residual 134 lv -= lvnu; 134 lv -= lvnu; 135 dir = lv.vect().unit(); 135 dir = lv.vect().unit(); 136 G4double ekin = std::max(lv.e() - resMass, 136 G4double ekin = std::max(lv.e() - resMass, 0.0); 137 dp = new G4DynamicParticle(fResIon, dir, e 137 dp = new G4DynamicParticle(fResIon, dir, ekin); 138 products->PushProducts(dp); 138 products->PushProducts(dp); 139 139 140 } else { 140 } else { 141 // neglecting relativistic kinematic and g 141 // neglecting relativistic kinematic and giving some energy to neutrino 142 dp = new G4DynamicParticle(fNeutrino, G4Ra 142 dp = new G4DynamicParticle(fNeutrino, G4RandomDirection(), elim); 143 products->PushProducts(dp); 143 products->PushProducts(dp); 144 dp = new G4DynamicParticle(fResIon, G4Thre 144 dp = new G4DynamicParticle(fResIon, G4ThreeVector(0.0,0.0,1.0), 0.0); 145 products->PushProducts(dp); 145 products->PushProducts(dp); 146 } 146 } 147 147 148 return products; 148 return products; 149 } 149 } 150 150 151 151 152 void 152 void 153 G4BetaMinusDecay::SetUpBetaSpectrumSampler(con 153 G4BetaMinusDecay::SetUpBetaSpectrumSampler(const G4int& daughterZ, 154 con 154 const G4int& daughterA, 155 con 155 const G4BetaDecayType& betaType) 156 { 156 { 157 cdf[0] = 0.0; 157 cdf[0] = 0.0; 158 158 159 // Check for cases in which Q < 0 159 // Check for cases in which Q < 0 160 if (maxEnergy > 0.) { 160 if (maxEnergy > 0.) { 161 G4BetaDecayCorrections corrections(daughte 161 G4BetaDecayCorrections corrections(daughterZ, daughterA); 162 162 163 // Fill array to store cumulative spectrum 163 // Fill array to store cumulative spectrum 164 G4double ex; // Kinetic energy normalized 164 G4double ex; // Kinetic energy normalized on electron mass 165 G4double p; // Momentum in units of elec 165 G4double p; // Momentum in units of electron mass 166 G4double f; // Spectral shape function 166 G4double f; // Spectral shape function 167 G4double f0 = 0.0; 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-1; ++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 + f0; 180 cdf[i] = sum; 180 cdf[i] = sum; 181 f0 = f; 181 f0 = f; 182 } 182 } 183 cdf[npti-1] = sum + f0; 183 cdf[npti-1] = sum + f0; 184 } else { 184 } else { 185 for (G4int i = 1; i < npti; ++i) { cdf[i] 185 for (G4int i = 1; i < npti; ++i) { cdf[i] = 0.0; } 186 } 186 } 187 } 187 } 188 188 189 189 190 void G4BetaMinusDecay::DumpNuclearInfo() 190 void G4BetaMinusDecay::DumpNuclearInfo() 191 { 191 { 192 G4cout << " G4BetaMinusDecay " << fPrimaryI 192 G4cout << " G4BetaMinusDecay " << fPrimaryIon->GetParticleName() 193 << " -> " << fResIon->GetParticleName() << 193 << " -> " << fResIon->GetParticleName() << " + " << fLepton->GetParticleName() 194 << " + " << fNeutrino->GetParticleName() << 194 << " + " << fNeutrino->GetParticleName() << " Eemax(MeV)=" 195 << maxEnergy*eMass << " BR=" << GetBR() << 195 << maxEnergy*eMass << " BR=" << GetBR() << "%" << G4endl; 196 } 196 } 197 197 198 198