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Geant4/processes/hadronic/models/radioactive_decay/src/G4AlphaDecay.cc

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Diff markup

Differences between /processes/hadronic/models/radioactive_decay/src/G4AlphaDecay.cc (Version 11.3.0) and /processes/hadronic/models/radioactive_decay/src/G4AlphaDecay.cc (Version 11.2.2)


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 26 //////////////////////////////////////////////     26 ////////////////////////////////////////////////////////////////////////////////
 27 //                                                 27 //                                                                            //
 28 //  File:   G4AlphaDecay.cc                        28 //  File:   G4AlphaDecay.cc                                                   //
 29 //  Author: D.H. Wright (SLAC)                     29 //  Author: D.H. Wright (SLAC)                                                //
 30 //  Date:   20 October 2014                        30 //  Date:   20 October 2014                                                   //
 31 //                                                 31 //                                                                            //
 32 //////////////////////////////////////////////     32 ////////////////////////////////////////////////////////////////////////////////
 33                                                    33 
 34 #include "G4AlphaDecay.hh"                         34 #include "G4AlphaDecay.hh"
 35 #include "G4IonTable.hh"                           35 #include "G4IonTable.hh"
 36 #include "Randomize.hh"                            36 #include "Randomize.hh"
 37 #include "G4ThreeVector.hh"                        37 #include "G4ThreeVector.hh"
 38 #include "G4DynamicParticle.hh"                    38 #include "G4DynamicParticle.hh"
 39 #include "G4DecayProducts.hh"                      39 #include "G4DecayProducts.hh"
 40 #include "G4PhysicalConstants.hh"                  40 #include "G4PhysicalConstants.hh"
 41 #include "G4SystemOfUnits.hh"                      41 #include "G4SystemOfUnits.hh"
 42 #include <iostream>                                42 #include <iostream>
 43 #include <iomanip>                                 43 #include <iomanip>
 44                                                    44 
 45 G4AlphaDecay::G4AlphaDecay(const G4ParticleDef     45 G4AlphaDecay::G4AlphaDecay(const G4ParticleDefinition* theParentNucleus,
 46                            const G4double& bra     46                            const G4double& branch, const G4double& Qvalue,
 47                            const G4double& exc     47                            const G4double& excitationE,
 48                            const G4Ions::G4Flo     48                            const G4Ions::G4FloatLevelBase& flb)
 49  : G4NuclearDecay("alpha decay", Alpha, excita     49  : G4NuclearDecay("alpha decay", Alpha, excitationE, flb), transitionQ(Qvalue)
 50 {                                                  50 {
 51   SetParent(theParentNucleus);  // Store name      51   SetParent(theParentNucleus);  // Store name of parent nucleus, delete G4MT_parent 
 52   SetBR(branch);                                   52   SetBR(branch);
 53                                                    53 
 54   SetNumberOfDaughters(2);                         54   SetNumberOfDaughters(2);
 55   G4IonTable* theIonTable =                        55   G4IonTable* theIonTable =
 56     (G4IonTable*)(G4ParticleTable::GetParticle     56     (G4IonTable*)(G4ParticleTable::GetParticleTable()->GetIonTable());
 57   G4int daughterZ = theParentNucleus->GetAtomi     57   G4int daughterZ = theParentNucleus->GetAtomicNumber() - 2;
 58   G4int daughterA = theParentNucleus->GetAtomi     58   G4int daughterA = theParentNucleus->GetAtomicMass() - 4;
 59   SetDaughter(0, theIonTable->GetIon(daughterZ     59   SetDaughter(0, theIonTable->GetIon(daughterZ, daughterA, excitationE, flb) );
 60   SetDaughter(1, "alpha");                         60   SetDaughter(1, "alpha");
 61 }                                                  61 }
 62                                                    62 
 63                                                    63 
 64 G4AlphaDecay::~G4AlphaDecay()                      64 G4AlphaDecay::~G4AlphaDecay()
 65 {}                                                 65 {}
 66                                                    66 
 67                                                    67 
 68 G4DecayProducts* G4AlphaDecay::DecayIt(G4doubl     68 G4DecayProducts* G4AlphaDecay::DecayIt(G4double)
 69 {                                                  69 {
 70   // Fill G4MT_parent with theParentNucleus (s     70   // Fill G4MT_parent with theParentNucleus (stored by SetParent in ctor)  
 71   CheckAndFillParent();                            71   CheckAndFillParent();
 72                                                    72 
 73   // Fill G4MT_daughters with alpha and residu     73   // Fill G4MT_daughters with alpha and residual nucleus (stored by SetDaughter)  
 74   CheckAndFillDaughters();                         74   CheckAndFillDaughters();
 75                                                    75 
 76   G4double alphaMass = G4MT_daughters[1]->GetP     76   G4double alphaMass = G4MT_daughters[1]->GetPDGMass();
 77   // Excitation energy included in PDG mass        77   // Excitation energy included in PDG mass
 78   G4double nucleusMass = G4MT_daughters[0]->Ge     78   G4double nucleusMass = G4MT_daughters[0]->GetPDGMass();
 79                                                    79 
 80   // Q value was calculated from atomic masses     80   // Q value was calculated from atomic masses.
 81   // Use it to get correct alpha energy.           81   // Use it to get correct alpha energy.
 82   G4double cmMomentum = std::sqrt(transitionQ*     82   G4double cmMomentum = std::sqrt(transitionQ*(transitionQ + 2.*alphaMass)*
 83                                 (transitionQ +     83                                 (transitionQ + 2.*nucleusMass)*
 84                                 (transitionQ +     84                                 (transitionQ + 2.*alphaMass + 2.*nucleusMass) )/
 85                                 (transitionQ +     85                                 (transitionQ + alphaMass + nucleusMass)/2.; 
 86                                                    86 
 87   // Set up final state                            87   // Set up final state
 88   // parentParticle is set at rest here becaus     88   // parentParticle is set at rest here because boost with correct momentum 
 89   // is done later                                 89   // is done later
 90   G4DynamicParticle parentParticle(G4MT_parent     90   G4DynamicParticle parentParticle(G4MT_parent, G4ThreeVector(0,0,0), 0.0);
 91   G4DecayProducts* products = new G4DecayProdu     91   G4DecayProducts* products = new G4DecayProducts(parentParticle);
 92                                                    92 
 93   G4double costheta = 2.*G4UniformRand()-1.0;      93   G4double costheta = 2.*G4UniformRand()-1.0;
 94   G4double sintheta = std::sqrt(1.0 - costheta     94   G4double sintheta = std::sqrt(1.0 - costheta*costheta);
 95   G4double phi  = twopi*G4UniformRand()*rad;       95   G4double phi  = twopi*G4UniformRand()*rad;
 96   G4ThreeVector direction(sintheta*std::cos(ph     96   G4ThreeVector direction(sintheta*std::cos(phi),sintheta*std::sin(phi),
 97                           costheta);               97                           costheta);
 98                                                    98 
 99   G4double KE = std::sqrt(cmMomentum*cmMomentu     99   G4double KE = std::sqrt(cmMomentum*cmMomentum + alphaMass*alphaMass)
100               - alphaMass;                        100               - alphaMass;
101   G4DynamicParticle* daughterparticle =           101   G4DynamicParticle* daughterparticle =
102     new G4DynamicParticle(G4MT_daughters[1], d    102     new G4DynamicParticle(G4MT_daughters[1], direction, KE, alphaMass);
103   products->PushProducts(daughterparticle);       103   products->PushProducts(daughterparticle);
104                                                   104 
105   KE = std::sqrt(cmMomentum*cmMomentum + nucle    105   KE = std::sqrt(cmMomentum*cmMomentum + nucleusMass*nucleusMass) - nucleusMass;
106   daughterparticle =                              106   daughterparticle =
107     new G4DynamicParticle(G4MT_daughters[0], -    107     new G4DynamicParticle(G4MT_daughters[0], -1.0*direction, KE, nucleusMass);
108   products->PushProducts(daughterparticle);       108   products->PushProducts(daughterparticle);
109                                                   109 
110   // Energy conservation check                    110   // Energy conservation check
111   // For alpha decays, do final energy check a    111   // For alpha decays, do final energy check against reaction Q value
112   // which is well-measured using atomic mass     112   // which is well-measured using atomic mass differences.  Nuclear masses
113   // should not be used since they are not usu    113   // should not be used since they are not usually directly measured and we
114   // always decay atoms and not fully stripped    114   // always decay atoms and not fully stripped nuclei.
115   /*                                              115   /*
116   G4int nProd = products->entries();              116   G4int nProd = products->entries();
117   G4DynamicParticle* temp = 0;                    117   G4DynamicParticle* temp = 0;
118   G4double Esum = 0.0;                            118   G4double Esum = 0.0;
119   for (G4int i = 0; i < nProd; i++) {             119   for (G4int i = 0; i < nProd; i++) {
120     temp = products->operator[](i);               120     temp = products->operator[](i);
121     Esum += temp->GetKineticEnergy();             121     Esum += temp->GetKineticEnergy();
122   }                                               122   }
123   G4double eCons = (transitionQ - Esum)/keV;      123   G4double eCons = (transitionQ - Esum)/keV;
124   if (eCons > 1.e-07) G4cout << " Alpha decay     124   if (eCons > 1.e-07) G4cout << " Alpha decay check: Ediff (keV) = " << eCons << G4endl;
125   */                                              125   */
126   return products;                                126   return products;
127 }                                                 127 }
128                                                   128 
129                                                   129 
130 void G4AlphaDecay::DumpNuclearInfo()              130 void G4AlphaDecay::DumpNuclearInfo()
131 {                                                 131 {
132   G4cout << " G4AlphaDecay for parent nucleus     132   G4cout << " G4AlphaDecay for parent nucleus " << GetParentName() << G4endl;
133   G4cout << " decays to " << GetDaughterName(0    133   G4cout << " decays to " << GetDaughterName(0) << " + " << GetDaughterName(1)
134          << " with branching ratio " << GetBR(    134          << " with branching ratio " << GetBR() << "% and Q value "
135          << transitionQ << G4endl;                135          << transitionQ << G4endl;
136 }                                                 136 }
137                                                   137 
138                                                   138