Geant4  10.00.p01
G4NeutronField.cc
Go to the documentation of this file.
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 // GEANT 4 class implementation file
29 //
30 // CERN, Geneva, Switzerland
31 //
32 // File name: G4NeutronField.cc
33 //
34 // Author: Alessandro Brunengo (Alessandro.Brunengo@ge.infn.it)
35 //
36 // Creation date: 5 June 2000
37 // -------------------------------------------------------------------
38 
39 #include "G4NeutronField.hh"
40 #include "G4PhysicalConstants.hh"
41 #include "G4SystemOfUnits.hh"
42 #include "G4VNuclearDensity.hh"
43 #include "G4FermiMomentum.hh"
44 
46  G4VNuclearField(aNucleus), theDensity(theNucleus->GetNuclearDensity())
47 {
52  G4double aR=0;
53  while(aR<theR)
54  {
55  G4ThreeVector aPosition(0,0,aR);
56  G4double density = GetDensity(aPosition);
57  G4double fermiMom = GetFermiMomentum(density);
58  theFermiMomBuffer.push_back(fermiMom);
59  aR+=0.3*fermi;
60  }
61  {
62  G4ThreeVector aPosition(0,0,theR);
63  G4double density = GetDensity(aPosition);
64  G4double fermiMom = GetFermiMomentum(density);
65  theFermiMomBuffer.push_back(fermiMom);
66  }
67  {
68  G4ThreeVector aPosition(0,0,theR+0.001*fermi);
69  theFermiMomBuffer.push_back(0);
70  }
71  {
72  G4ThreeVector aPosition(0,0,1.*m);
73  theFermiMomBuffer.push_back(0);
74  }
75 }
76 
78 { }
79 
81 {
82  G4double x = aPosition.mag();
83  G4int index = static_cast<G4int>(x/(0.3*fermi) );
84  if(index+2> static_cast<G4int>(theFermiMomBuffer.size())) return theFermiMomBuffer.back();
85  G4double y1 = theFermiMomBuffer[index];
86  G4double y2 = theFermiMomBuffer[index+1];
87  G4double x1 = (0.3*fermi)*index;
88  G4double x2 = (0.3*fermi)*(index+1);
89  G4double fermiMom = y1 + (x-x1)*(y2-y1)/(x2-x1);
90  return -1*(fermiMom*fermiMom)/(2*neutron_mass_c2);
91 }
92 
94 {
95 /*
96  * G4double A = theNucleus->GetMassNumber();
97  * G4double Z = theNucleus->GetCharge();
98  *
99  * return G4NucleiPropertiesTable::GetBindingEnergy(Z, A)/A;
100  */
101  return 0.;
102 }
103 
104 
105 
106 
107 
108 
G4FermiMomentum theFermi
virtual G4int GetCharge()=0
CLHEP::Hep3Vector G4ThreeVector
G4double GetDensity(const G4ThreeVector &aPosition)
virtual G4int GetMassNumber()=0
G4NeutronField(G4V3DNucleus *nucleus)
int G4int
Definition: G4Types.hh:78
virtual G4double GetField(const G4ThreeVector &aPosition)
virtual G4double GetOuterRadius()=0
G4double density
Definition: TRTMaterials.hh:39
std::vector< G4double > theFermiMomBuffer
void Init(G4int anA, G4int aZ)
G4V3DNucleus * theNucleus
static const double m
Definition: G4SIunits.hh:110
virtual G4double GetBarrier()
double G4double
Definition: G4Types.hh:76
G4double GetFermiMomentum(const G4double aDensity)
virtual ~G4NeutronField()
static const double fermi
Definition: G4SIunits.hh:93