G4EmElementXS.cc

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//
// -------------------------------------------------------------------
//
// GEANT4 Class file
//
// File name:     G4EmElementXS
//
// Author:        V. Ivanchenko 
// 
// Creation date: 22 August 2024
//
// -------------------------------------------------------------------
//
 
#include "G4EmElementXS.hh"
#include "G4ElementData.hh"
#include "G4ElementDataRegistry.hh"
#include "G4EmParameters.hh"
#include "G4PhysicsVector.hh"
#include "G4PhysicsFreeVector.hh"
#include "G4AutoLock.hh"
#include "G4SystemOfUnits.hh"
 
namespace
{
  G4Mutex elementXSMutex = G4MUTEX_INITIALIZER;
}
 
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G4EmElementXS::G4EmElementXS(G4int zmin, G4int zmax, const G4String& name,
                 const G4String& subname)
  : Zmin(zmin - 1), Zmax(zmax), fSubName(subname)
{
  fParameters = G4EmParameters::Instance();
  auto reg = G4ElementDataRegistry::Instance();
  fData = reg->GetElementDataByName(name);
  if (nullptr == fData) {
    fData = new G4ElementData(Zmax - Zmin);
    fData->SetName(name);
    reg->RegisterMe(fData);
  }
}
 
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G4PhysicsVector* G4EmElementXS::Retrieve(G4int ZZ) const
{
  G4int Z = std::min(ZZ, Zmax);
  auto v = fData->GetElementData(Z);
  if (nullptr == v) {
    G4AutoLock l(&elementXSMutex);
    v = fData->GetElementData(Z);
    if (nullptr == v) {
      v = new G4PhysicsFreeVector(false);
      std::ostringstream ost;
      ost << fParameters->GetDirLEDATA() << fSubName << Z << ".dat";
      std::ifstream fin(ost.str().c_str());
      if (!fin.is_open()) {
    G4ExceptionDescription ed;
    ed << "G4EmElementXS: data file <" << ost.str().c_str() << "> for Z=" << Z
       << " is not opened!" << G4endl;
    G4Exception("G4EmElementXS::Retrieve()", "em0003", FatalException, ed,
            "G4LEDATA version should be checked");
      } else {
    v->Retrieve(fin, true);
    v->ScaleVector(CLHEP::MeV, CLHEP::barn);
      }
      fData->InitialiseForElement(Z, v);
      l.unlock();
    }
  }
  return v;
}
 
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G4double G4EmElementXS::GetXS(G4int Z, G4double ekin) const
{
  auto v = Retrieve(Z);
  return (nullptr != v) ? v->Value(ekin) : 0.0;
}
 
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