Geant4  10.01.p01
G4VhElectronicStoppingPower.cc
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28 //
29 // GEANT4 Class file
30 //
31 //
32 // File name: G4VhElectronicStoppingPower
33 //
34 // Author: V.Ivanchenko (Vladimir.Ivanchenko@cern.ch)
35 //
36 // Creation date: 20 July 2000
37 //
38 // Modifications:
39 // 20/07/2000 V.Ivanchenko First implementation
40 //
41 // Class Description:
42 //
43 // Low energy hadrons/ions electronic stopping power parametrisation
44 //
45 // Class Description: End
46 //
47 // -------------------------------------------------------------------
48 //
49 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
50 
52 #include "G4SystemOfUnits.hh"
53 #include "G4UnitsTable.hh"
54 
55 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
56 
58  theHeMassAMU(4.0026)
59 {;}
60 
61 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
62 
64 {;}
65 
66 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
67 
69  const G4double z,
70  const G4double kineticEnergyHe) const
71 {
72  // The aproximation of He effective charge from:
73  // J.F.Ziegler, J.P. Biersack, U. Littmark
74  // The Stopping and Range of Ions in Matter,
75  // Vol.1, Pergamon Press, 1985
76 
77  static const G4double c[6] = {0.2865, 0.1266, -0.001429,
78  0.02402,-0.01135, 0.001475} ;
79 
80  G4double e = std::log( std::max( 1.0, kineticEnergyHe/(keV*GetHeMassAMU()))) ;
81  G4double x = c[0] ;
82  G4double y = 1.0 ;
83  for (G4int i=1; i<6; i++) {
84  y *= e ;
85  x += y * c[i] ;
86  }
87 
88  G4double w = 7.6 - e ;
89  w = 1.0 + (0.007 + 0.00005*z) * std::exp( -w*w ) ;
90  w = 4.0 * (1.0 - std::exp(-x)) * w * w ;
91  return w;
92 }
G4double z
Definition: TRTMaterials.hh:39
int G4int
Definition: G4Types.hh:78
G4double HeEffChargeSquare(const G4double z, const G4double kineticEnergyHe) const
T max(const T t1, const T t2)
brief Return the largest of the two arguments
static const double keV
Definition: G4SIunits.hh:195
double G4double
Definition: G4Types.hh:76