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G4NeutronHPWattSpectrum.hh
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27 // $Id$
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29 #ifndef G4NeutronHPWattSpectrum_h
30 #define G4NeutronHPWattSpectrum_h 1
31 
32 #include <fstream>
34 
35 #include "globals.hh"
36 #include "G4ios.hh"
37 #include "Randomize.hh"
38 #include "G4NeutronHPVector.hh"
39 #include "G4VNeutronHPEDis.hh"
40 
41 // we will need a List of these .... one per term.
42 
44 {
45  public:
47  {
48  expm1 = std::exp(-1.);
49  }
51  {
52  }
53 
54  inline void Init(std::ifstream & aDataFile)
55  {
56  theFractionalProb.Init(aDataFile, CLHEP::eV);
57  theApar.Init(aDataFile, CLHEP::eV);
58  theBpar.Init(aDataFile, CLHEP::eV);
59  }
60 
62  {
63  return theFractionalProb.GetY(anEnergy);
64  }
65 
66  G4double Sample(G4double anEnergy);
67 
68  private:
69 
70  inline G4double Watt(G4double anEnergy, G4double a, G4double b)
71  {
72  G4double energy = anEnergy/CLHEP::eV;
73  G4double result = std::exp(-energy/a)*std::sinh(std::sqrt(b*energy));
74  return result;
75  }
76 
77  private:
78 
79  G4double expm1;
80 
81  G4NeutronHPVector theFractionalProb;
82 
83  G4NeutronHPVector theApar;
84  G4NeutronHPVector theBpar;
85 
86 };
87 
88 #endif