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G4ElementSelector.cc
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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 
49 {}
50 
51 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
52 
54 {}
55 
56 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
57 
58 G4Element*
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  size_t i = 0;
66  const G4Material* mat = track.GetMaterial();
67  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 = G4lrint((*theElementVector)[i]->GetZ());
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  G4Element* elm = (*theElementVector)[i];
102  G4int Z = G4lrint(elm->GetZ());
103 
104  // select isotope
105  const G4IsotopeVector* isv = elm->GetIsotopeVector();
106  size_t ni = isv->size();
107  i = 0;
108 
109  if(1 < ni) {
110 
111  const G4double* ab = elm->GetRelativeAbundanceVector();
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(i)->GetN();
120  target->SetParameters(A, Z);
121 
122  return elm;
123 }
124