include/Geant4/G4ParticleHPNBodyPhaseSpace.hh

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0025 //
0026 //
0027 // P. Arce, June-2014 Conversion neutron_hp to particle_hp
0028 //
0029 #ifndef G4ParticleHPNBodyPhaseSpace_h
0030 #define G4ParticleHPNBodyPhaseSpace_h 1
0031
0032 #include "G4Neutron.hh"
0033 #include "G4Pow.hh"
0034 #include "G4ReactionProduct.hh"
0035 #include "G4VParticleHPEnergyAngular.hh"
0036 #include "G4ios.hh"
0037 #include "globals.hh"
0038
0039 #include <CLHEP/Units/PhysicalConstants.h>
0040
0041 #include <fstream>
0042
0043 class G4ParticleHPNBodyPhaseSpace : public G4VParticleHPEnergyAngular
0044 {
0045   public:
0046     G4ParticleHPNBodyPhaseSpace()
0047     {
0048       theTotalMass = 0.0;
0049       theTotalCount = 0;
0050     }
0051     ~G4ParticleHPNBodyPhaseSpace() override = default;
0052
0053   public:
0054     void Init(G4double aMass, G4int aCount)
0055     {
0056       theTotalMass = aMass;
0057       theTotalCount = aCount;
0058     }
0059
0060     void Init(std::istream& aDataFile) override
0061     {
0062       aDataFile >> theTotalMass >> theTotalCount;
0063       theTotalMass *= G4Neutron::Neutron()->GetPDGMass();
0064     }
0065
0066     G4ReactionProduct* Sample(G4double anEnergy, G4double massCode, G4double mass) override;
0067
0068   private:
0069     inline G4double Prob(G4double anEnergy, G4double eMax, G4int n)
0070     {
0071       G4double result;
0072       result = std::sqrt(anEnergy) * G4Pow::GetInstance()->powA(eMax - anEnergy, 3. * n / 2. - 4.);
0073       return result;
0074     }
0075
0076     inline G4double C(G4double anEnergy, G4double mass)
0077     {
0078       G4double result(0);
0079       if (theTotalCount == 3)
0080         result = 4. / CLHEP::pi / G4Pow::GetInstance()->powN(GetEmax(anEnergy, mass), 2);
0081       if (theTotalCount == 4)
0082         result = 105. / 32. / G4Pow::GetInstance()->powA(GetEmax(anEnergy, mass), 3.5);
0083       // if(theTotalCount==5) result =
0084       // 256./14./CLHEP::pi/G4Pow::GetInstance()->powA(GetEmax(anEnergy, mass), 5.);
0085       if (theTotalCount == 5)
0086         result = 256. / 14. / CLHEP::pi / G4Pow::GetInstance()->powN(GetEmax(anEnergy, mass), 5);
0087       return result;
0088     }
0089
0090     inline G4double GetEmax(G4double anEnergy, G4double mass)
0091     {
0092       G4double result;
0093       G4double tMass = GetTarget()->GetMass();
0094       G4double pMass = GetProjectileRP()->GetMass();
0095       G4double availableEnergy = GetQValue() + anEnergy * tMass / (pMass + tMass);
0096       result = availableEnergy * (theTotalMass - mass) / theTotalMass;
0097       return result;
0098     }
0099
0100     G4double MeanEnergyOfThisInteraction() override { return -1; }
0101
0102   private:
0103     G4double theTotalMass;
0104     G4int theTotalCount;
0105 };
0106 #endif