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28 //
29 // GEANT4 Class header file
30 //
31 //
32 // File name: G4GammaNuclearXS
33 //
34 // Authors V.Ivantchenko, Geant4, 20 October 2020
35 // B.Kutsenko, BINP/NSU, 10 August 2021
36 //
37 //
38 // Class Description:
39 // This is a base class for gamma-nuclear cross section based on
40 // data files from IAEA Evaluated Photonuclear Data Library (IAEA/PD-2019)
41 // https://www-nds.iaea.org/photonuclear/
42 // Database review:
43 // https://www.sciencedirect.com/science/article/pii/S0090375219300699?via%3Dihub
44 //
45
46 #ifndef G4GammaNuclearXS_h
47 #define G4GammaNuclearXS_h 1
48
49 #include "G4VCrossSectionDataSet.hh"
50 #include "globals.hh"
51 #include <vector>
52
53 class G4DynamicParticle;
54 class G4ParticleDefinition;
55 class G4Element;
56 class G4ElementData;
57 class G4PhysicsVector;
58 class G4PhotoNuclearCrossSection;
59
60 class G4GammaNuclearXS final : public G4VCrossSectionDataSet
61 {
62 public:
63
64 G4GammaNuclearXS();
65
66 ~G4GammaNuclearXS() override = default;
67
68 static const char* Default_Name() { return "GammaNuclearXS"; }
69
70 G4bool IsElementApplicable(const G4DynamicParticle*,
71 G4int Z, const G4Material*) final;
72
73 G4bool IsIsoApplicable(const G4DynamicParticle*, G4int Z, G4int A,
74 const G4Element*, const G4Material* mat) final;
75
76 G4double GetElementCrossSection(const G4DynamicParticle*,
77 G4int Z,
78 const G4Material* mat = nullptr) final;
79
80 G4double GetIsoCrossSection(const G4DynamicParticle*, G4int Z, G4int A,
81 const G4Isotope* iso = nullptr,
82 const G4Element* elm = nullptr,
83 const G4Material* mat = nullptr) final;
84
85 const G4Isotope* SelectIsotope(const G4Element*,
86 G4double kinEnergy, G4double logE) final;
87
88 void BuildPhysicsTable(const G4ParticleDefinition&) final;
89
90 G4double IsoCrossSection(const G4double ekin, const G4int Z, const G4int A);
91
92 G4double ElementCrossSection(const G4double ekin, const G4int Z);
93
94 G4double LowEnergyCrossSection(G4double ekin, G4int Z);
95
96 void CrossSectionDescription(std::ostream&) const final;
97
98 G4GammaNuclearXS & operator=(const G4GammaNuclearXS &right) = delete;
99 G4GammaNuclearXS(const G4GammaNuclearXS&) = delete;
100
101 private:
102
103 void Initialise(G4int Z);
104
105 const G4String& FindDirectoryPath();
106
107 G4PhysicsVector* RetrieveVector(std::ostringstream& in, G4bool warn, G4int Z);
108
109 G4PhotoNuclearCrossSection* ggXsection = nullptr;
110 const G4ParticleDefinition* gamma;
111
112 // Cache
113 G4double fXS = 0.0;
114 G4double fEkin = 0.0;
115 G4int fZ = 0;
116
117 static const G4int MAXZGAMMAXS = 95;
118 static const G4int MAXNFREE = 11;
119 static G4ElementData* data;
120 // The list of elements with non-linear parametrisation for better precision
121 static const G4int freeVectorException[MAXNFREE];
122 // CHIPS photonuclear model had a problem with high energy parametrisation
123 // for isotopes of H and He, coefficient is needed to connect isotope cross
124 // section with element cross-section on high energies.
125 static G4double coeff[3][3];
126 static G4double xs150[MAXZGAMMAXS];
127 static G4String gDataDirectory;
128
129 std::vector<G4double> temp;
130 };
131
132 #endif
133