G4IonCoulombCrossSection.hh

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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

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#include <CLHEP/Units/SystemOfUnits.h>

#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;

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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;  

};


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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()/CLHEP::eplus);
    chargeSquare = q*q;
    tkin = 0.0;
}
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inline G4double G4IonCoulombCrossSection::GetMomentum2(){
    return mom2;
}
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#endif