G4ecpssrFormFactorKxsModel.cc

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// 
// History:
// -----------
//  01 Oct 2011   A.M., S.I. - 1st implementation
// 
// Class description
// ----------------
//  Computation of K, L & M shell ECPSSR ionisation cross sections for protons and alphas
//  Based on the work of A. Taborda et al. 
//  X-Ray Spectrom. 2011, 40, 127-134
// ---------------------------------------------------------------------------------------

#include <fstream>
#include <iomanip>

#include "G4ecpssrFormFactorKxsModel.hh"

#include "globals.hh"
#include "G4SystemOfUnits.hh"
#include "G4ios.hh"

#include "G4EMDataSet.hh"
#include "G4LogLogInterpolation.hh"
#include "G4Proton.hh"
#include "G4Alpha.hh"

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G4ecpssrFormFactorKxsModel::G4ecpssrFormFactorKxsModel()
{ 
  interpolation = new G4LogLogInterpolation();

  for (G4int i=6; i<93; i++) 
  {
      protonDataSetMap[i] = new G4EMDataSet(i,interpolation);
      protonDataSetMap[i]->LoadData("pixe/ecpssr/proton/k-");
  }

  for (G4int i=6; i<93; i++) 
  {
      alphaDataSetMap[i] = new G4EMDataSet(i,interpolation);
      alphaDataSetMap[i]->LoadData("pixe/ecpssr/alpha/k-");
  }

}

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G4ecpssrFormFactorKxsModel::~G4ecpssrFormFactorKxsModel()
{ 
  protonDataSetMap.clear();
  alphaDataSetMap.clear();
  delete interpolation;
}

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G4double G4ecpssrFormFactorKxsModel::CalculateCrossSection(G4int zTarget,G4double massIncident, G4double energyIncident)
{
  G4Proton* aProton = G4Proton::Proton();
  G4Alpha* aAlpha = G4Alpha::Alpha();  
  G4double sigma = 0;

  if (energyIncident > 0.1*MeV && energyIncident < 100.*MeV && zTarget < 93 && zTarget > 5) {

    if (massIncident == aProton->GetPDGMass())
      {         
        sigma = protonDataSetMap[zTarget]->FindValue(energyIncident/MeV);  
        if (sigma !=0 && energyIncident > protonDataSetMap[zTarget]->GetEnergies(0).back()*MeV) return 0.;
      }
    else if (massIncident == aAlpha->GetPDGMass())
      {
        sigma = alphaDataSetMap[zTarget]->FindValue(energyIncident/MeV); 
        if (sigma !=0 && energyIncident > alphaDataSetMap[zTarget]->GetEnergies(0).back()*MeV) return 0.;
      }
    else
      { 
        sigma = 0.;
      }
  }
  
  // sigma is in internal units: it has been converted from 
  // the input file in barns bt the EmDataset
  return sigma;
}

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