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// $Id: G4QElastic.hh,v 1.4 2008/10/02 21:10:07 dennis Exp $
// GEANT4 tag $Name: geant4-09-02-ref-02 $
//
//      ---------------- G4QElastic header ----------------
//                 by Mikhail Kossov, December 2003.
//  Header of G4QElastic class (hadron+A) of the CHIPS Simulation Branch in GEANT4
// -------------------------------------------------------------------------------
// This is a unique CHIPS class for the Hadron-Nuclear Elastic Scattering Prosesses
// -------------------------------------------------------------------------------
// At present (Jan-06) only proton-proton scattering is implemented The interaction with
// nuclei are planned only. The scattering of nuclei on nuclei are possible...
// The simulation is based on the CHIPS approximation of total elastic and differential
// elastic cross sections from E=0 to the highest energyes.
// -------------------------------------------------------------------------------

#ifndef G4QElastic_hh
#define G4QElastic_hh

// GEANT4 Headers
#include "globals.hh"
#include "G4ios.hh"
#include "Randomize.hh" 
#include "G4VDiscreteProcess.hh"
#include "G4Track.hh"
#include "G4Step.hh"
#include "G4ParticleTypes.hh"
#include "G4VParticleChange.hh"
#include "G4ParticleDefinition.hh"
#include "G4DynamicParticle.hh"
#include "G4NucleiPropertiesTable.hh"
#include "G4ThreeVector.hh"
#include "G4LorentzVector.hh"
#include "G4HadronicProcessType.hh"

// CHIPS Headers
#include "G4QElasticCrossSection.hh"
#include "G4QIsotope.hh"
#include "G4QPDGToG4Particle.hh"
#include "G4QCHIPSWorld.hh"
#include "G4QHadron.hh"
#include <vector>

class G4QElastic : public G4VDiscreteProcess
{
public:

  // Constructor
  G4QElastic(const G4String& processName ="CHIPSElasticScattering");

  // Destructor
  ~G4QElastic();

  G4bool IsApplicable(const G4ParticleDefinition& particle);

  G4double GetMeanFreePath(const G4Track& aTrack, G4double previousStepSize,
                           G4ForceCondition* condition);
  // It returns the MeanFreePath of the process for the current track :
  // (energy, material)
  // The previousStepSize and G4ForceCondition* are not used.
  // This function overloads a virtual function of the base class.		      
  // It is invoked by the ProcessManager of the Particle.
 

  G4VParticleChange* PostStepDoIt(const G4Track& aTrack, const G4Step& aStep); 
  // It computes the final state of the process (at end of step),
  // returned as a ParticleChange object.			    
  // This function overloads a virtual function of the base class.
  // It is invoked by the ProcessManager of the Particle.


  G4LorentzVector GetEnegryMomentumConservation();

  G4int GetNumberOfNeutronsInTarget();

private:

  // Hide assignment operator as private 
  G4QElastic& operator=(const G4QElastic &right);

  // Copy constructor
  G4QElastic(const G4QElastic&);

  // Calculate XS/t: oxs=true - only CS; xst=true - calculate XS, xst=false(oxs=f/t) - t/tm
  G4double CalculateXSt(G4bool oxs, G4bool xst, G4double p, G4int Z, G4int N, G4int pPDG);

		// BODY
  // Static Parameters --------------------------------------------------------------------
  static G4int    nPartCWorld; // The#of particles for hadronization (limit of A of fragm.)
  //--------------------------------- End of static parameters ---------------------------
  // Working parameters
  G4VQCrossSection* theCS;
  G4LorentzVector EnMomConservation;                  // Residual of Energy/Momentum Cons.
  G4int nOfNeutrons;                                  // #of neutrons in the target nucleus

  // Modifires for the reaction
  G4double Time;                                      // Time shift of the capture reaction
  G4double EnergyDeposition;                          // Energy deposited in the reaction
  static std::vector <G4int> ElementZ;                // Z of the element(i) in theLastCalc
  static std::vector <G4double> ElProbInMat;          // SumProbabilityElements in Material
  static std::vector <std::vector<G4int>*> ElIsoN;    // N of isotope(j) of Element(i)
  static std::vector <std::vector<G4double>*> IsoProbInEl;// SumProbabIsotopes in Element i
};
#endif

