include/Geant4/G4ParticleHPWattSpectrum.hh

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0025 //
0026 //
0027 // P. Arce, June-2014 Conversion neutron_hp to particle_hp
0028 //
0029 #ifndef G4ParticleHPWattSpectrum_h
0030 #define G4ParticleHPWattSpectrum_h 1
0031
0032 #include "G4Exp.hh"
0033 #include "G4ParticleHPVector.hh"
0034 #include "G4VParticleHPEDis.hh"
0035 #include "G4ios.hh"
0036 #include "Randomize.hh"
0037 #include "globals.hh"
0038
0039 #include <CLHEP/Units/SystemOfUnits.h>
0040
0041 #include <fstream>
0042
0043 // we will need a List of these .... one per term.
0044
0045 class G4ParticleHPWattSpectrum : public G4VParticleHPEDis
0046 {
0047   public:
0048     G4ParticleHPWattSpectrum() { expm1 = G4Exp(-1.); }
0049     ~G4ParticleHPWattSpectrum() override = default;
0050
0051     inline void Init(std::istream& aDataFile) override
0052     {
0053       theFractionalProb.Init(aDataFile, CLHEP::eV);
0054       theApar.Init(aDataFile, CLHEP::eV);
0055       theBpar.Init(aDataFile, CLHEP::eV);
0056     }
0057
0058     inline G4double GetFractionalProbability(G4double anEnergy) override
0059     {
0060       return theFractionalProb.GetY(anEnergy);
0061     }
0062
0063     G4double Sample(G4double anEnergy) override;
0064
0065   private:
0066     inline G4double Watt(G4double anEnergy, G4double a, G4double b)
0067     {
0068       G4double energy = anEnergy / CLHEP::eV;
0069       G4double result = G4Exp(-energy / a) * std::sinh(std::sqrt(b * energy));
0070       return result;
0071     }
0072
0073   private:
0074     G4double expm1;
0075
0076     G4ParticleHPVector theFractionalProb;
0077
0078     G4ParticleHPVector theApar;
0079     G4ParticleHPVector theBpar;
0080 };
0081
0082 #endif