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#ifndef G4IonsShenCrossSection_h
#define G4IonsShenCrossSection_h
//
// Class Description
// Implementation of formulas 
// Shen et al. Nuc. Phys. A 491 130 (1989); 
// Total Reaction Cross Section for Heavy-Ion Collisions 
//
// Class Description - End
// 18-Sep-2003 First version is written by T. Koi
// 12-Nov-2003 Set upper limit at 10 GeV/n
// 12-Nov-2003 Insted of the lower limit,
//             0 is returned to a partilce with energy lowae than 10 MeV/n
// 15-Nov-2006 Change upper limit to 1 TeV/n
//             However above 10GeV/n XS become constant.
// 23-Dec-2006 Isotope dependence added by D. Wright
//

#include "globals.hh"
#include "G4Proton.hh"

#include "G4VCrossSectionDataSet.hh"

class G4IonsShenCrossSection : public G4VCrossSectionDataSet
{
   public:
      G4IonsShenCrossSection ():
         upperLimit ( 1 * TeV ),
         lowerLimit ( 10 * MeV ),
         r0 ( 1.1 )
      {
      }
   
   virtual
   G4bool IsApplicable(const G4DynamicParticle* aDP, const G4Element*)
   {
     return IsIsoApplicable(aDP, 0, 0);
   }

   virtual
   G4bool IsIsoApplicable(const G4DynamicParticle* aDP,
                          G4int /*ZZ*/, G4int /*AA*/)
   {
     G4int baryonNumber = aDP->GetDefinition()->GetBaryonNumber();
     G4double kineticEnergy = aDP->GetKineticEnergy(); 
     if ( kineticEnergy / baryonNumber <= upperLimit ) 
        return true;
     return false;
   }


   virtual
   G4double GetCrossSection(const G4DynamicParticle*, 
                            const G4Element*, G4double aTemperature);

   virtual
   G4double GetZandACrossSection(const G4DynamicParticle*, G4int ZZ, 
                                 G4int AA, G4double aTemperature);

   virtual
   void BuildPhysicsTable(const G4ParticleDefinition&)
   {}

   virtual
   void DumpPhysicsTable(const G4ParticleDefinition&) 
   {G4cout << "G4IonsShenCrossSection: uses Shen formula"<<G4endl;}

   private:
      const G4double upperLimit;
      const G4double lowerLimit; 
      const G4double r0;

      G4double calEcmValue(const G4double, const G4double, const G4double); 
      G4double calCeValue(const G4double); 
};

#endif
