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25 //
26 //
27 // -------------------------------------------------------------------
28 //
29 // GEANT4 Class file
30 //
31 // File name: G4EmElementXS
32 //
33 // Author: V. Ivanchenko
34 //
35 // Creation date: 22 August 2024
36 //
37 // -------------------------------------------------------------------
38 //
39
40 #include "G4EmElementXS.hh"
41 #include "G4ElementData.hh"
42 #include "G4ElementDataRegistry.hh"
43 #include "G4EmParameters.hh"
44 #include "G4PhysicsVector.hh"
45 #include "G4PhysicsFreeVector.hh"
46 #include "G4AutoLock.hh"
47 #include "G4SystemOfUnits.hh"
48
49 namespace
50 {
51 G4Mutex elementXSMutex = G4MUTEX_INITIALIZER;
52 }
53
54 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
55
56 G4EmElementXS::G4EmElementXS(G4int zmin, G4int zmax, const G4String& name,
57 const G4String& subname)
58 : Zmin(zmin - 1), Zmax(zmax), fSubName(subname)
59 {
60 fParameters = G4EmParameters::Instance();
61 auto reg = G4ElementDataRegistry::Instance();
62 fData = reg->GetElementDataByName(name);
63 if (nullptr == fData) {
64 fData = new G4ElementData(Zmax - Zmin);
65 fData->SetName(name);
66 reg->RegisterMe(fData);
67 }
68 }
69
70 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
71
72 G4PhysicsVector* G4EmElementXS::Retrieve(G4int ZZ) const
73 {
74 G4int Z = std::min(ZZ, Zmax);
75 auto v = fData->GetElementData(Z);
76 if (nullptr == v) {
77 G4AutoLock l(&elementXSMutex);
78 v = fData->GetElementData(Z);
79 if (nullptr == v) {
80 v = new G4PhysicsFreeVector(false);
81 std::ostringstream ost;
82 ost << fParameters->GetDirLEDATA() << fSubName << Z << ".dat";
83 std::ifstream fin(ost.str().c_str());
84 if (!fin.is_open()) {
85 G4ExceptionDescription ed;
86 ed << "G4EmElementXS: data file <" << ost.str().c_str() << "> for Z=" << Z
87 << " is not opened!" << G4endl;
88 G4Exception("G4EmElementXS::Retrieve()", "em0003", FatalException, ed,
89 "G4LEDATA version should be checked");
90 } else {
91 v->Retrieve(fin, true);
92 v->ScaleVector(CLHEP::MeV, CLHEP::barn);
93 }
94 fData->InitialiseForElement(Z, v);
95 l.unlock();
96 }
97 }
98 return v;
99 }
100
101 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
102
103 G4double G4EmElementXS::GetXS(G4int Z, G4double ekin) const
104 {
105 auto v = Retrieve(Z);
106 return (nullptr != v) ? v->Value(ekin) : 0.0;
107 }
108
109 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
110
111