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// GEANT4 tag $Name: geant4-09-03-cand-01 $
//
//
// GEANT4 physics class: G4QNeutronNuclearCrossSection -- header file
// Created: M.V. Kossov, CERN/ITEP(Moscow), 17-May-2009
// The last update: M.V. Kossov, CERN/ITEP (Moscow) 21-May-2009
//
// **********************************************************************
// ****** This HEADER is property of the CHIPS model (M. Kosov) *********
// ******************** DO NOT MAKE ANY CHANGE! (M.K.) ******************
//=========================================================================
// Short description: CHIPS cross-sections for neutron-nuclear interactions
// ------------------------------------------------------------------------

#ifndef G4QNeutronNuclearCrossSection_h
#define G4QNeutronNuclearCrossSection_h 1

#include "G4ParticleTable.hh"
#include "G4NucleiProperties.hh"
#include <vector>
#include "G4VQCrossSection.hh"

class G4QNeutronNuclearCrossSection : public G4VQCrossSection
{
protected:

  G4QNeutronNuclearCrossSection()  {}

public:

  ~G4QNeutronNuclearCrossSection();

  static G4VQCrossSection* GetPointer(); // Gives a pointer to this singletone

  // At present momentum (pMom) in MeV/c, CS in mb (@@ Units)
  virtual G4double GetCrossSection(G4bool fCS, G4double pMom, G4int tgZ, G4int tgN,
                                   G4int pPDG=2112);

  G4double CalculateCrossSection(G4bool CS, G4int F, G4int I, G4int PDG, G4int Z,
                                 G4int N, G4double Momentum);

private:
  G4double CrossSectionLin(G4int targZ, G4int targN, G4double P);
  G4double CrossSectionLog(G4int targZ, G4int targN, G4double lP);
  G4double CrossSectionFormula(G4int targZ, G4int targN, G4double P, G4double lP);
// Body
private:
  static G4double  lastSig; // Last value of the Cross Section
  static G4double* lastLEN; // Pointer to the last array of LowEnergy cross sections
  static G4double* lastHEN; // Pointer to the last array of HighEnergy cross sections
  static G4double  lastE;   // Last used in the cross section Energy
  static G4int     lastPDG; // The last projectile PDG
  static G4int     lastN;   // The last N of calculated nucleus
  static G4int     lastZ;   // The last Z of calculated nucleus
  static G4double  lastP;   // Last used in the cross section Momentum
  static G4double  lastTH;  // Last value of the Momentum Threshold
  static G4double  lastCS;  // Last value of the Cross Section
  static G4int     lastI;   // The last position in the DAMDB
  static G4double  HEthresh;  // High energy threshold parameter for the CS calculation
  static std::vector<G4double*>* LEN;  // Vector of pointers to LowEnNeutronCrossSection
  static std::vector<G4double*>* HEN;  // Vector of pointers to HighEnNeutronCrossSection
};

#endif
