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#include "G4NuclearShellModelDensity.hh"

G4NuclearShellModelDensity::G4NuclearShellModelDensity(G4double anA, G4double aZ) 
{
        const G4double r0sq=0.8133*fermi*fermi;
	theA = G4int(anA);
	theZ = G4int(aZ);
	theRsquare= r0sq * std::pow(G4double(theA), 2./3. );
	Setrho0(std::pow(1./(pi*theRsquare),3./2.));
}

G4NuclearShellModelDensity::~G4NuclearShellModelDensity() {}
    
G4double G4NuclearShellModelDensity::GetRelativeDensity(const G4ThreeVector & aPosition) const
{
	return std::exp(-1*aPosition.mag2()/theRsquare);
}
    
G4double G4NuclearShellModelDensity::GetRadius(const G4double maxRelativeDensity) const
{

     return (maxRelativeDensity>0 && maxRelativeDensity <= 1 ) ?
             std::sqrt(theRsquare * std::log(1/maxRelativeDensity) ) : DBL_MAX;
}
   
G4double   G4NuclearShellModelDensity::GetDeriv(const G4ThreeVector & aPosition) const
{
     return -2* aPosition.mag() / theRsquare * GetDensity(aPosition);
}