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27 // -------------------------------------------------------------------
28 //
29 // GEANT4 Class header file G4ChargeExchangeXS
30 //
31 // Author V.Ivanchenko
32 //
33 // Modified: 09.08.2023 Tim Lok Chau, CERN summer student program
34 //
35
36 // This is a class for charge exchange hadronic cross sections:
37 // pi- + N(Z, A) -> X + N(Z-1, A)
38 // pi+ + N(Z, A) -> X + N(Z+1, A)
39 //
40 // where X = pi0, eta, etaP, omega, f2
41 // V. Lyubovitsky, NA64 Collaboration (CERN)
42 //
43 // K- + N(Z, A) -> Y + N(Z-1, A)
44 // K+ + N(Z, A) -> Y + N(Z+1, A)
45 // KL + N(Z, A) -> K+ + N(Z-1, A)
46 // KL + N(Z, A) -> K- + N(Z+1, A)
47 //
48 // where Y = KS, KL
49 //
50
51 #ifndef G4ChargeExchangeXS_h
52 #define G4ChargeExchangeXS_h
53
54 #include "G4VCrossSectionDataSet.hh"
55 #include "globals.hh"
56 #include <vector>
57
58 class G4DynamicParticle;
59 class G4ParticleDefinition;
60 class G4Isotope;
61 class G4Element;
62 class G4Material;
63 class G4Pow;
64
65 class G4ChargeExchangeXS final : public G4VCrossSectionDataSet
66 {
67 public:
68
69 G4ChargeExchangeXS();
70
71 ~G4ChargeExchangeXS() override = default;
72
73 G4bool IsElementApplicable(const G4DynamicParticle*, G4int Z,
74 const G4Material*) final;
75
76 G4double GetElementCrossSection(const G4DynamicParticle*, G4int Z,
77 const G4Material*) final;
78
79 void CrossSectionDescription(std::ostream&) const final;
80
81 const G4ParticleDefinition*
82 SampleSecondaryType(const G4ParticleDefinition*,
83 const G4int Z, const G4int A);
84
85 void SetEnergyLimit(G4double val) { fEnergyLimit = val; };
86
87 void SetCrossSectionFactor(G4double val) { fFactor = val; };
88
89 G4double GetCrossSectionFactor() const { return fFactor; };
90
91 G4ChargeExchangeXS & operator=(const G4ChargeExchangeXS &right) = delete;
92 G4ChargeExchangeXS(const G4ChargeExchangeXS&) = delete;
93
94 private:
95
96 G4double ComputeDeuteronFraction(const G4Material*);
97
98 G4Pow* g4calc;
99 const G4ParticleDefinition* fPionSecPD[5];
100 G4double fXSecPion[5] = {0.0, 0.0, 0.0, 0.0, 0.0};
101 G4double fEnergyLimit{0.0};
102 G4double fFactor{1.0};
103 };
104
105 #endif
106