Import Geant4 11.0.0.beta source tree

2021-06-25 16:12:29 +02:00
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+//
+// ********************************************************************
+// * License and Disclaimer                                           *
+// *                                                                  *
+// * The  Geant4 software  is  copyright of the Copyright Holders  of *
+// * the Geant4 Collaboration.  It is provided  under  the terms  and *
+// * conditions of the Geant4 Software License,  included in the file *
+// * LICENSE and available at  http://cern.ch/geant4/license .  These *
+// * include a list of copyright holders.                             *
+// *                                                                  *
+// * 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.  Please see the license in the file  LICENSE  and URL above *
+// * for the full disclaimer and the limitation of liability.         *
+// *                                                                  *
+// * This  code  implementation is the result of  the  scientific and *
+// * technical work of the GEANT4 collaboration.                      *
+// * By using,  copying,  modifying or  distributing the software (or *
+// * any work based  on the software)  you  agree  to acknowledge its *
+// * use  in  resulting  scientific  publications,  and indicate your *
+// * acceptance of all terms of the Geant4 Software license.          *
+// ********************************************************************
+//
+//
+
+#ifndef G4NuclearFermiDensity_h
+#define G4NuclearFermiDensity_h 1
+
+#include "globals.hh"
+#include "G4ThreeVector.hh"
+#include "G4VNuclearDensity.hh"
+
+#include <CLHEP/Units/PhysicalConstants.h>	// pi, fermi,..
+#include "G4Exp.hh"
+#include "G4Log.hh"
+//#include <cmath>				// pow
+
+class G4NuclearFermiDensity : public G4VNuclearDensity
+{
+  public:
+    G4NuclearFermiDensity(G4int anA, G4int aZ);
+    ~G4NuclearFermiDensity();
+    
+    G4double GetRelativeDensity(const G4ThreeVector & aPosition) const
+    {
+      return 1./(1.+G4Exp((aPosition.mag()-theR)/a));
+    }
+    
+    G4double GetRadius(const G4double maxRelativeDenisty) const
+    {
+      return (maxRelativeDenisty>0 && maxRelativeDenisty <= 1 ) ?
+             (theR + a*G4Log((1-maxRelativeDenisty+G4Exp(-1*theR/a))/maxRelativeDenisty))  : DBL_MAX;
+    }
+    
+    G4double GetDeriv(const G4ThreeVector & aPosition) const
+    {
+      G4double currentR=aPosition.mag();
+      if (currentR > 40*theR  ) {return 0;}
+      else return -G4Exp((currentR-theR)/a) * sqr(GetDensity(aPosition)) / (a*Getrho0());
+    }   
+   
+  private:
+    G4int theA;
+    G4double theR;      // Nuclear Radius 
+    const G4double a;	// Determines the nuclear surface thickness
+};
+
+#endif
+