Import Geant4 6.0.0 source tree

2016-06-09 10:41:53 +02:00
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+//
+// ********************************************************************
+// * DISCLAIMER                                                       *
+// *                                                                  *
+// * The following disclaimer summarizes all the specific disclaimers *
+// * of contributors to this software. The specific disclaimers,which *
+// * govern, are listed with their locations in:                      *
+// *   http://cern.ch/geant4/license                                  *
+// *                                                                  *
+// * Neither the authors of this software system, nor their employing *
+// * institutes,nor the agencies providing financial support for this *
+// * work  make  any representation or  warranty, express or implied, *
+// * regarding  this  software system or assume any liability for its *
+// * use.                                                             *
+// *                                                                  *
+// * This  code  implementation is the  intellectual property  of the *
+// * GEANT4 collaboration.                                            *
+// * By copying,  distributing  or modifying the Program (or any work *
+// * based  on  the Program)  you indicate  your  acceptance of  this *
+// * statement, and all its terms.                                    *
+// ********************************************************************
+//
+//
+//
+#ifndef G4NuclearFermiDensity_h
+#define G4NuclearFermiDensity_h 1
+
+#include "globals.hh"
+#include "G4ThreeVector.hh"
+#include "G4VNuclearDensity.hh"
+
+#include <CLHEP/Units/PhysicalConstants.h>	// pi, fermi,..
+#include <math.h>				// pow
+
+class G4NuclearFermiDensity : public G4VNuclearDensity
+{
+
+  public:
+    G4NuclearFermiDensity(G4double anA, G4double aZ);
+    ~G4NuclearFermiDensity();
+    
+    G4double GetRelativeDensity(const G4ThreeVector & aPosition) const
+    {
+      return 1./(1.+exp((aPosition.mag()-theR)/a));
+    }
+    
+    G4double GetRadius(const G4double maxRelativeDenisty) const
+    {
+      return (maxRelativeDenisty>0 && maxRelativeDenisty <= 1 ) ?
+             (theR + a*log((1-maxRelativeDenisty+exp(-1*theR/a))/maxRelativeDenisty))  : DBL_MAX;
+    }
+    
+    G4double GetDeriv(const G4ThreeVector & aPosition) const
+    {
+      return -exp((aPosition.mag()-theR)/a) * sqr(GetDensity(aPosition)) / (a*Getrho0());
+    }   
+   
+  private:
+  
+    G4int    theA;
+    G4int    theZ;
+    G4double theR;      // Nuclear Radius 
+    const G4double a;	// Determines the nuclear surface thickness
+  
+};
+
+#endif
+