Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/processes/hadronic/util/include/G4NuclearFermiDensity.hh

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 26 //
 27 
 28 #ifndef G4NuclearFermiDensity_h
 29 #define G4NuclearFermiDensity_h 1
 30 
 31 #include "globals.hh"
 32 #include "G4ThreeVector.hh"
 33 #include "G4VNuclearDensity.hh"
 34 
 35 #include <CLHEP/Units/PhysicalConstants.h>  // pi, fermi,..
 36 #include "G4Exp.hh"
 37 #include "G4Log.hh"
 38 //#include <cmath>        // pow
 39 
 40 class G4NuclearFermiDensity : public G4VNuclearDensity
 41 {
 42   public:
 43     G4NuclearFermiDensity(G4int anA, G4int aZ);
 44     ~G4NuclearFermiDensity();
 45     
 46     G4double GetRelativeDensity(const G4ThreeVector & aPosition) const
 47     {
 48       return 1./(1.+G4Exp((aPosition.mag()-theR)/a));
 49     }
 50     
 51     G4double GetRadius(const G4double maxRelativeDenisty) const
 52     {
 53       return (maxRelativeDenisty>0 && maxRelativeDenisty <= 1 ) ?
 54              (theR + a*G4Log((1-maxRelativeDenisty+G4Exp(-1*theR/a))/maxRelativeDenisty))  : DBL_MAX;
 55     }
 56     
 57     G4double GetDeriv(const G4ThreeVector & aPosition) const
 58     {
 59       G4double currentR=aPosition.mag();
 60       if (currentR > 40*theR  ) {return 0;}
 61       else return -G4Exp((currentR-theR)/a) * sqr(GetDensity(aPosition)) / (a*Getrho0());
 62     }   
 63    
 64   private:
 65     G4int theA;
 66     G4double theR;      // Nuclear Radius 
 67     const G4double a; // Determines the nuclear surface thickness
 68 };
 69 
 70 #endif
 71 
 72