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G4VhElectronicStoppingPower.cc
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25 //
26 //
27 // -------------------------------------------------------------------
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 
51 #include "G4VhElectronicStoppingPower.hh"
52 #include "G4SystemOfUnits.hh"
53 #include "G4UnitsTable.hh"
54 #include "G4Exp.hh"
55 
56 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
57 
58 G4VhElectronicStoppingPower::G4VhElectronicStoppingPower():
59  theHeMassAMU(4.0026)
60 {;}
61 
62 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
63 
64 G4VhElectronicStoppingPower::~G4VhElectronicStoppingPower()
65 {;}
66 
67 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
68 
69 G4double G4VhElectronicStoppingPower::HeEffChargeSquare(
70  const G4double z,
71  const G4double kineticEnergyHe) const
72 {
73  // The aproximation of He effective charge from:
74  // J.F.Ziegler, J.P. Biersack, U. Littmark
75  // The Stopping and Range of Ions in Matter,
76  // Vol.1, Pergamon Press, 1985
77 
78  static const G4double c[6] = {0.2865, 0.1266, -0.001429,
79  0.02402,-0.01135, 0.001475} ;
80 
81  G4double e = std::log( std::max( 1.0, kineticEnergyHe/(keV*GetHeMassAMU()))) ;
82  G4double x = c[0] ;
83  G4double y = 1.0 ;
84  for (G4int i=1; i<6; i++) {
85  y *= e ;
86  x += y * c[i] ;
87  }
88 
89  G4double w = 7.6 - e ;
90  w = 1.0 + (0.007 + 0.00005*z) * G4Exp( -w*w ) ;
91  w = 4.0 * (1.0 - G4Exp(-x)) * w * w ;
92  return w;
93 }