Geant4_10
G4NeutronHPSimpleEvapSpectrum.hh
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28 #ifndef G4NeutronHPSimpleEvapSpectrum_h
29 #define G4NeutronHPSimpleEvapSpectrum_h 1
30 
31 #include <fstream>
33 
34 #include "globals.hh"
35 #include "G4ios.hh"
36 #include "Randomize.hh"
37 #include "G4NeutronHPVector.hh"
38 #include "G4VNeutronHPEDis.hh"
39 
40 // we will need a List of these .... one per term.
41 
43 {
44  public:
46  {
47  expm1 = std::exp(-1.);
48  }
50  {
51  }
52 
53  inline void Init(std::istream & aDataFile)
54  {
55  theFractionalProb.Init(aDataFile, CLHEP::eV);
56  theThetaDist.Init(aDataFile, CLHEP::eV);
57  }
58 
60  {
61  return theFractionalProb.GetY(anEnergy);
62  }
63 
64  inline G4double Sample(G4double anEnergy)
65  {
66  G4double theta = theThetaDist.GetY(anEnergy)*CLHEP::eV;
67  G4double random, cut, max, result;
68  max = 10.*theta;
69  do
70  {
71  random = G4UniformRand();
72  result = -theta*std::log(random);
73  cut = G4UniformRand();
74  }
75  while(cut>result/max);
76  return result;
77  }
78 
79  private:
80 
81  inline G4double Evapo(G4double anEnergy, G4double theta)
82  {
83  G4double result = (anEnergy*CLHEP::eV)*std::exp(-anEnergy*CLHEP::eV/theta);
84  return result;
85  }
86 
87  private:
88 
89  G4double expm1;
90 
91  G4NeutronHPVector theFractionalProb;
92 
93  G4NeutronHPVector theThetaDist;
94 
95 };
96 
97 #endif
G4double GetY(G4double x)
G4double G4NeutronHPJENDLHEData::G4double result
void Init(std::istream &aDataFile, G4int total, G4double ux=1., G4double uy=1.)
#define G4UniformRand()
Definition: Randomize.hh:87
T max(const T t1, const T t2)
brief Return the largest of the two arguments
double G4double
Definition: G4Types.hh:76
G4double GetFractionalProbability(G4double anEnergy)