include/Geant4/G4ChargeExchangeXS.hh

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0027 // -------------------------------------------------------------------
0028 //
0029 // GEANT4 Class header file G4ChargeExchangeXS
0030 //
0031 // Author V.Ivanchenko
0032 //
0033 // Modified: 09.08.2023 Tim Lok Chau, CERN summer student program
0034 //
0035
0036 // This is a class for charge exchange hadronic cross sections:
0037 // pi- + N(Z, A) -> X + N(Z-1, A)
0038 // pi+ + N(Z, A) -> X + N(Z+1, A)
0039 //
0040 // where X = pi0, eta, etaP, omega, f2
0041 // V. Lyubovitsky, NA64 Collaboration (CERN)
0042 //
0043 // K- + N(Z, A) -> Y  + N(Z-1, A)
0044 // K+ + N(Z, A) -> Y  + N(Z+1, A)
0045 // KL + N(Z, A) -> K+ + N(Z-1, A)
0046 // KL + N(Z, A) -> K- + N(Z+1, A)
0047 //
0048 // where Y = KS, KL
0049 //
0050
0051 #ifndef G4CHARGEEXCHANGEXS_HH
0052 #define G4CHARGEEXCHANGEXS_HH
0053
0054 #include "G4VCrossSectionDataSet.hh"
0055 #include "globals.hh"
0056 #include <vector>
0057
0058 class G4DynamicParticle;
0059 class G4ParticleDefinition;
0060 class G4Isotope;
0061 class G4Element;
0062 class G4Material;
0063 class G4Pow;
0064
0065 class G4ChargeExchangeXS final : public G4VCrossSectionDataSet
0066 {
0067 public:
0068
0069   G4ChargeExchangeXS();
0070
0071   ~G4ChargeExchangeXS() override = default;
0072
0073   G4bool IsElementApplicable(const G4DynamicParticle*, G4int Z,
0074                              const G4Material*) final;
0075
0076   G4double GetElementCrossSection(const G4DynamicParticle*, G4int Z,
0077                                   const G4Material*) final;
0078
0079   void CrossSectionDescription(std::ostream&) const final;
0080
0081   const G4ParticleDefinition*
0082   SampleSecondaryType(const G4ParticleDefinition*, const G4Material*,
0083               G4int Z, G4int A, G4double etot);
0084
0085   G4double GetPartialPionXS(G4int idx) const;
0086
0087   void SetEnergyLimit(G4double val) { fEnergyLimit = val; };
0088
0089   void SetPionCrossSectionFactor(G4double val) { fFactorPi = val; };
0090
0091   void SetKaonCrossSectionFactor(G4double val) { fFactorK = val; };
0092
0093   G4double GetCrossSectionFactor() const { return fFactor; };
0094
0095   G4bool isPion() const { return findex >= 0; };
0096
0097   G4double SampleTforPion(const G4double etot,
0098               const G4double tmax) const;
0099
0100   G4ChargeExchangeXS & operator=(const G4ChargeExchangeXS &right) = delete;
0101   G4ChargeExchangeXS(const G4ChargeExchangeXS&) = delete;
0102
0103 private:
0104
0105   G4double GetCrossSection(const G4ParticleDefinition*, const G4Material*,
0106                G4int Z, G4double etot);
0107
0108   G4double ComputeDeuteronFraction(const G4Material*) const;
0109
0110   G4Pow* g4calc;
0111   G4int findex{-1};
0112   const G4ParticleDefinition* fPionSecPD[5];
0113   G4double fXSecPion[5] = {0.0, 0.0, 0.0, 0.0, 0.0};
0114   G4double fEnergyLimit{0.0};
0115   G4double fFactorPi{1.0};
0116   G4double fFactorK{1.0};
0117   G4double fFactor{1.0};
0118   G4double fMassPi;
0119 };
0120
0121 #endif