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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 : G4VDecayChannel("alpha decay"), transitionQ(Qvalue), daughterEx(excitationE),
49 : G4NuclearDecay("alpha decay", Alpha, excita << 49 halflifeThreshold(nanosecond)
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 SetDaughter(0, "alpha"); // Store name of 1st daughter
55 G4IonTable* theIonTable = 56 G4IonTable* theIonTable =
56 (G4IonTable*)(G4ParticleTable::GetParticle 57 (G4IonTable*)(G4ParticleTable::GetParticleTable()->GetIonTable());
57 G4int daughterZ = theParentNucleus->GetAtomi 58 G4int daughterZ = theParentNucleus->GetAtomicNumber() - 2;
58 G4int daughterA = theParentNucleus->GetAtomi << 59 G4int daughterA = theParentNucleus->GetAtomicMass() - 4;
59 SetDaughter(0, theIonTable->GetIon(daughterZ << 60 SetDaughter(1, theIonTable->GetIon(daughterZ, daughterA, daughterEx) );
60 SetDaughter(1, "alpha"); <<
61 } 61 }
62 62
63 63
>> 64 G4AlphaDecay::G4AlphaDecay(const G4AlphaDecay& right)
>> 65 : G4VDecayChannel(right), transitionQ(right.transitionQ),
>> 66 daughterEx(right.daughterEx), halflifeThreshold(right.halflifeThreshold)
>> 67 {}
>> 68
>> 69
64 G4AlphaDecay::~G4AlphaDecay() 70 G4AlphaDecay::~G4AlphaDecay()
65 {} 71 {}
66 72
67 73
68 G4DecayProducts* G4AlphaDecay::DecayIt(G4doubl 74 G4DecayProducts* G4AlphaDecay::DecayIt(G4double)
69 { 75 {
70 // Fill G4MT_parent with theParentNucleus (s 76 // Fill G4MT_parent with theParentNucleus (stored by SetParent in ctor)
71 CheckAndFillParent(); << 77 if (G4MT_parent == 0) FillParent();
72 78
73 // Fill G4MT_daughters with alpha and residu 79 // Fill G4MT_daughters with alpha and residual nucleus (stored by SetDaughter)
74 CheckAndFillDaughters(); << 80 if (G4MT_daughters == 0) FillDaughters();
75 81
76 G4double alphaMass = G4MT_daughters[1]->GetP << 82 G4double alphaMass = G4MT_daughters[0]->GetPDGMass();
77 // Excitation energy included in PDG mass 83 // Excitation energy included in PDG mass
78 G4double nucleusMass = G4MT_daughters[0]->Ge << 84 G4double nucleusMass = G4MT_daughters[1]->GetPDGMass();
79 85
80 // Q value was calculated from atomic masses 86 // Q value was calculated from atomic masses.
81 // Use it to get correct alpha energy. 87 // Use it to get correct alpha energy.
82 G4double cmMomentum = std::sqrt(transitionQ* 88 G4double cmMomentum = std::sqrt(transitionQ*(transitionQ + 2.*alphaMass)*
83 (transitionQ + 89 (transitionQ + 2.*nucleusMass)*
84 (transitionQ + 90 (transitionQ + 2.*alphaMass + 2.*nucleusMass) )/
85 (transitionQ + 91 (transitionQ + alphaMass + nucleusMass)/2.;
86 92
87 // Set up final state 93 // Set up final state
88 // parentParticle is set at rest here becaus 94 // parentParticle is set at rest here because boost with correct momentum
89 // is done later 95 // is done later
90 G4DynamicParticle parentParticle(G4MT_parent 96 G4DynamicParticle parentParticle(G4MT_parent, G4ThreeVector(0,0,0), 0.0);
91 G4DecayProducts* products = new G4DecayProdu 97 G4DecayProducts* products = new G4DecayProducts(parentParticle);
92 98
93 G4double costheta = 2.*G4UniformRand()-1.0; 99 G4double costheta = 2.*G4UniformRand()-1.0;
94 G4double sintheta = std::sqrt(1.0 - costheta 100 G4double sintheta = std::sqrt(1.0 - costheta*costheta);
95 G4double phi = twopi*G4UniformRand()*rad; 101 G4double phi = twopi*G4UniformRand()*rad;
96 G4ThreeVector direction(sintheta*std::cos(ph 102 G4ThreeVector direction(sintheta*std::cos(phi),sintheta*std::sin(phi),
97 costheta); 103 costheta);
98 104
99 G4double KE = std::sqrt(cmMomentum*cmMomentu 105 G4double KE = std::sqrt(cmMomentum*cmMomentum + alphaMass*alphaMass)
100 - alphaMass; 106 - alphaMass;
101 G4DynamicParticle* daughterparticle = 107 G4DynamicParticle* daughterparticle =
102 new G4DynamicParticle(G4MT_daughters[1], d << 108 new G4DynamicParticle(G4MT_daughters[0], direction, KE, alphaMass);
103 products->PushProducts(daughterparticle); 109 products->PushProducts(daughterparticle);
104 110
105 KE = std::sqrt(cmMomentum*cmMomentum + nucle 111 KE = std::sqrt(cmMomentum*cmMomentum + nucleusMass*nucleusMass) - nucleusMass;
106 daughterparticle = 112 daughterparticle =
107 new G4DynamicParticle(G4MT_daughters[0], - << 113 new G4DynamicParticle(G4MT_daughters[1], -1.0*direction, KE, nucleusMass);
108 products->PushProducts(daughterparticle); 114 products->PushProducts(daughterparticle);
109 115
110 // Energy conservation check <<
111 // For alpha decays, do final energy check a <<
112 // which is well-measured using atomic mass <<
113 // should not be used since they are not usu <<
114 // always decay atoms and not fully stripped <<
115 /* <<
116 G4int nProd = products->entries(); <<
117 G4DynamicParticle* temp = 0; <<
118 G4double Esum = 0.0; <<
119 for (G4int i = 0; i < nProd; i++) { <<
120 temp = products->operator[](i); <<
121 Esum += temp->GetKineticEnergy(); <<
122 } <<
123 G4double eCons = (transitionQ - Esum)/keV; <<
124 if (eCons > 1.e-07) G4cout << " Alpha decay <<
125 */ <<
126 return products; 116 return products;
127 } 117 }
128 118
129 119
130 void G4AlphaDecay::DumpNuclearInfo() << 120 void G4AlphaDecay::DumpInfo()
131 { 121 {
132 G4cout << " G4AlphaDecay for parent nucleus 122 G4cout << " G4AlphaDecay for parent nucleus " << GetParentName() << G4endl;
133 G4cout << " decays to " << GetDaughterName(0 123 G4cout << " decays to " << GetDaughterName(0) << " + " << GetDaughterName(1)
134 << " with branching ratio " << GetBR( << 124 << " with branching ratio " << GetBR() << " and Q value "
135 << transitionQ << G4endl; 125 << transitionQ << G4endl;
136 } 126 }
137 127
138 128