Geant4  v4-10.4-release
 모두 클래스 네임스페이스들 파일들 함수 변수 타입정의 열거형 타입 열거형 멤버 Friends 매크로 그룹들 페이지들
G4NuclearFermiDensity.hh
이 파일의 문서화 페이지로 가기
1 //
2 // ********************************************************************
3 // * License and Disclaimer *
4 // * *
5 // * The Geant4 software is copyright of the Copyright Holders of *
6 // * the Geant4 Collaboration. It is provided under the terms and *
7 // * conditions of the Geant4 Software License, included in the file *
8 // * LICENSE and available at http://cern.ch/geant4/license . These *
9 // * include a list of copyright holders. *
10 // * *
11 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file LICENSE and URL above *
16 // * for the full disclaimer and the limitation of liability. *
17 // * *
18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboration. *
20 // * By using, copying, modifying or distributing the software (or *
21 // * any work based on the software) you agree to acknowledge its *
22 // * use in resulting scientific publications, and indicate your *
23 // * acceptance of all terms of the Geant4 Software license. *
24 // ********************************************************************
25 //
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 
41 {
42  public:
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:
66  G4double theR; // Nuclear Radius
67  const G4double a; // Determines the nuclear surface thickness
68 };
69 
70 #endif
71 
G4double G4Exp(G4double initial_x)
Exponential Function double precision.
Definition: G4Exp.hh:183
G4double GetDensity(const G4ThreeVector &aPosition) const
G4double G4Log(G4double x)
Definition: G4Log.hh:230
G4double GetRadius(const G4double maxRelativeDenisty) const
double G4double
Definition: G4Types.hh:76
G4double GetDeriv(const G4ThreeVector &aPosition) const
G4double GetRelativeDensity(const G4ThreeVector &aPosition) const
G4double Getrho0() const
double mag() const
int G4int
Definition: G4Types.hh:78
G4NuclearFermiDensity(G4int anA, G4int aZ)
T sqr(const T &x)
Definition: templates.hh:145
#define DBL_MAX
Definition: templates.hh:83