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26 //
27 // P. Arce, June-2014 Conversion neutron_hp to particle_hp
28 //
29 #ifndef G4ParticleHPSimpleEvapSpectrum_h
30 #define G4ParticleHPSimpleEvapSpectrum_h 1
31
32 #include "G4Exp.hh"
33 #include "G4Log.hh"
34 #include "G4ParticleHPVector.hh"
35 #include "G4VParticleHPEDis.hh"
36 #include "G4ios.hh"
37 #include "Randomize.hh"
38 #include "globals.hh"
39
40 #include <CLHEP/Units/SystemOfUnits.h>
41
42 #include <fstream>
43
44 // we will need a List of these .... one per term.
45
46 class G4ParticleHPSimpleEvapSpectrum : public G4VParticleHPEDis
47 {
48 public:
49 G4ParticleHPSimpleEvapSpectrum() { expm1 = G4Exp(-1.); }
50 ~G4ParticleHPSimpleEvapSpectrum() override = default;
51
52 inline void Init(std::istream& aDataFile) override
53 {
54 theFractionalProb.Init(aDataFile, CLHEP::eV);
55 theThetaDist.Init(aDataFile, CLHEP::eV);
56 }
57
58 inline G4double GetFractionalProbability(G4double anEnergy) override
59 {
60 return theFractionalProb.GetY(anEnergy);
61 }
62
63 inline G4double Sample(G4double anEnergy) override
64 {
65 G4double theta = theThetaDist.GetY(anEnergy) * CLHEP::eV;
66 G4double random, cut, max, result = 0.;
67 max = 10. * theta;
68 G4int icounter = 0;
69 G4int icounter_max = 1024;
70 do {
71 icounter++;
72 if (icounter > icounter_max) {
73 G4cout << "Loop-counter exceeded the threshold value at " << __LINE__ << "th line of "
74 << __FILE__ << "." << G4endl;
75 break;
76 }
77 random = G4UniformRand();
78 result = -theta * G4Log(random);
79 cut = G4UniformRand();
80 } while (cut > result / max); // Loop checking, 11.05.2015, T. Koi
81 return result;
82 }
83
84 private:
85 inline G4double Evapo(G4double anEnergy, G4double theta)
86 {
87 G4double result = (anEnergy * CLHEP::eV) * G4Exp(-anEnergy * CLHEP::eV / theta);
88 return result;
89 }
90
91 private:
92 G4double expm1;
93
94 G4ParticleHPVector theFractionalProb;
95
96 G4ParticleHPVector theThetaDist;
97 };
98
99 #endif
100