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//	G4IonCoulombCrossSection.hh
//-------------------------------------------------------------------
//
// GEANT4 Class header file
//
// File name:    G4IonCoulombCrossSection
//
// Author:      Cristina Consolandi
//
// Creation date: 05.10.2010 from G4eCoulombScatteringModel
//
// Class Description:
//      Computation of Screen-Coulomb Cross Section
//      for protons, alpha and heavy Ions
//
//
// Reference:
//      M.J. Boschini et al. "Nuclear and Non-Ionizing Energy-Loss
//      for Coulomb Scattered Particles from Low Energy up to Relativistic
//      Regime in Space Radiation Environment"
//      Accepted for publication in the Proceedings of  the  ICATPP Conference
//      on Cosmic Rays for Particle and Astroparticle Physics, Villa  Olmo, 7-8
//      October,  2010, to be published by World Scientific (Singapore).
//
//      Available for downloading at:
//      http://arxiv.org/abs/1011.4822
//
// -------------------------------------------------------------------

//
#ifndef G4IonCoulombCrossSection_h
#define G4IonCoulombCrossSection_h 1

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

#include "globals.hh"
#include "G4Material.hh"
#include "G4Element.hh"
#include "G4ElementVector.hh"
#include "G4NistManager.hh"
#include "G4ThreeVector.hh"
#include "G4Pow.hh"
#include "G4LossTableManager.hh"

class G4ParticleDefinition;

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

class G4IonCoulombCrossSection
{

public:

  	G4IonCoulombCrossSection();

  	virtual ~G4IonCoulombCrossSection();

   	void Initialise(const G4ParticleDefinition*, G4double cosThetaLim);

  	G4double NuclearCrossSection();

  	G4double SampleCosineTheta();

  	inline void SetupParticle(const G4ParticleDefinition*);

  	void SetupKinematic(G4double kinEnergy, G4double cut,G4int iz);

  	void SetupTarget(G4double Z, G4double kinEnergy,G4int heavycorr);

	inline G4double GetMomentum2();

private:
         void   SetScreenRSquare(G4int iz);


 	G4IonCoulombCrossSection & operator=(const  G4IonCoulombCrossSection &right);
  	G4IonCoulombCrossSection(const  G4IonCoulombCrossSection&);



  	const G4ParticleDefinition* theProton;  

  	G4NistManager*  fNistManager;		

protected:
  	G4double                coeff;	  

	//cost - min - max 
        G4double                cosThetaMin;// def 1.0
        G4double                cosThetaMax;// def -1.0

						//SetupTarget
        G4double                cosTetMinNuc;// -->cosThetaMin
        G4double                cosTetMaxNuc;// -->cosThetaMax


	//cross section
  	G4double                nucXSection;    	

	//energy cut
  	G4double                ecut;	    
   	G4double                etag;	    

	// projectile........................
 	const G4ParticleDefinition* particle;

  	G4double                chargeSquare;  
 	G4double                spin;	   
  	G4double                mass;	   

	//lab of incedent particle 
        G4double                tkinLab;
        G4double                momLab2;
        G4double                invbetaLab2;

	//relative system with nucleus
 	G4double                tkin;	   
  	G4double                mom2;	   
  	G4double                invbeta2;	   

  	// target nucleus
  	G4double                targetZ;    
  	G4double                targetMass; 
  	G4double                screenZ; 
  

private:

  	G4double                alpha2;
  	G4double 		ScreenRSquare;  

};


//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....

inline void G4IonCoulombCrossSection::SetupParticle(const G4ParticleDefinition* p)
{
  	particle = p;
  	mass = particle->GetPDGMass();
  	spin = particle->GetPDGSpin();
  		if(0.0 != spin) { spin = 0.5; }
  	G4double q = std::fabs(particle->GetPDGCharge()/eplus);
  	chargeSquare = q*q;
  	tkin = 0.0;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....


inline G4double G4IonCoulombCrossSection::GetMomentum2(){
	return mom2;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....

#endif