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25 //
26 //
27 // File: G4ElementSelector
28 //
29 // Author: V.Ivanchenko (Vladimir.Ivanchenko@cern.ch)
30 //
31 // Creation date: 2 April 2000
32 //
33 // Modifications:
34 // 18/08/2000 V.Ivanchenko Update description
35 // 17/05/2006 V.Ivanchenko Cleanup
36 // 02/10/2007 V.Ivanchenko Fixed typo in computation of Lambda-factor
37 // proposed by Victor Pec
38 //
39 //---------------------------------------------------------------------
40
41 #include "G4ElementSelector.hh"
42 #include "Randomize.hh"
43 #include "G4Material.hh"
44 #include "G4Nucleus.hh"
45
46 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
47
48 G4ElementSelector::G4ElementSelector()
49 {}
50
51 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
52
53 G4ElementSelector::~G4ElementSelector()
54 {}
55
56 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
57
58 const G4Element*
59 G4ElementSelector::SelectZandA(const G4Track& track, G4Nucleus* target)
60 {
61 // Fermi-Teller Z-low of mu- capture and exceptions
62 // for halogens and oxigen.
63 // N.C.Mukhopadhyay Phys. Rep. 30 (1977) 1.
64
65 std::size_t i = 0;
66 const G4Material* mat = track.GetMaterial();
67 std::size_t numberOfElements = mat->GetNumberOfElements();
68 const G4ElementVector* theElementVector = mat->GetElementVector();
69
70 if(1 < numberOfElements) {
71 if(numberOfElements > prob.size()) { prob.resize(numberOfElements, 0.0); }
72
73 const G4double* theAtomNumDensity = mat->GetAtomicNumDensityVector();
74
75 G4double sum = 0.0;
76 for (i=0; i < numberOfElements; ++i) {
77
78 G4int Z = (*theElementVector)[i]->GetZasInt();
79
80 // Halogens
81 if( (9 == Z) || (17 == Z) || (35 == Z) || (53 == Z) || (85 == Z) ) {
82 sum += 0.66 * Z * theAtomNumDensity[i];
83
84 // Oxigen
85 } else if( 8 == Z ) {
86 sum += 0.56 * Z * theAtomNumDensity[i];
87
88 // Others
89 } else {
90 sum += Z * theAtomNumDensity[i];
91 }
92 prob[i] = sum;
93 }
94
95 sum *= G4UniformRand();
96 for (i=0; i < numberOfElements; ++i) {
97 if(sum <= prob[i]) { break; }
98 }
99 }
100
101 const G4Element* elm = (*theElementVector)[i];
102 G4int Z = elm->GetZasInt();
103
104 // select isotope
105 const G4IsotopeVector* isv = elm->GetIsotopeVector();
106 std::size_t ni = isv->size();
107 i = 0;
108
109 if(1 < ni) {
110
111 const G4double* ab = elm->GetRelativeAbundanceVector();
112 G4double y = G4UniformRand();
113 for(i=0; i<ni; ++i) {
114 y -= ab[i];
115 if(y <= 0.0) { break; }
116 }
117 }
118
119 G4int A = elm->GetIsotope((G4int)i)->GetN();
120 target->SetParameters(A, Z);
121
122 return elm;
123 }
124