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24 // ******************************************* 24 // ********************************************************************
25 // 25 //
26 // 26 //
27 // ------------------------------------------- 27 // -------------------------------------------------------------------
28 // 28 //
29 // GEANT4 Class file 29 // GEANT4 Class file
30 // 30 //
31 // 31 //
32 // File name: G4VhElectronicStoppingPower 32 // File name: G4VhElectronicStoppingPower
33 // 33 //
34 // Author: V.Ivanchenko (Vladimir.Ivanc 34 // Author: V.Ivanchenko (Vladimir.Ivanchenko@cern.ch)
35 // 35 //
36 // Creation date: 20 July 2000 36 // Creation date: 20 July 2000
37 // 37 //
38 // Modifications: 38 // Modifications:
39 // 20/07/2000 V.Ivanchenko First implementati 39 // 20/07/2000 V.Ivanchenko First implementation
40 // 40 //
41 // Class Description: 41 // Class Description:
42 // 42 //
43 // Low energy hadrons/ions electronic stopping 43 // Low energy hadrons/ions electronic stopping power parametrisation
44 // 44 //
45 // Class Description: End 45 // Class Description: End
46 // 46 //
47 // ------------------------------------------- 47 // -------------------------------------------------------------------
48 // 48 //
49 //....oooOO0OOooo........oooOO0OOooo........oo 49 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
50 50
51 #include "G4VhElectronicStoppingPower.hh" 51 #include "G4VhElectronicStoppingPower.hh"
52 #include "G4SystemOfUnits.hh" 52 #include "G4SystemOfUnits.hh"
53 #include "G4UnitsTable.hh" 53 #include "G4UnitsTable.hh"
54 #include "G4Exp.hh" 54 #include "G4Exp.hh"
55 55
56 //....oooOO0OOooo........oooOO0OOooo........oo 56 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
57 57
58 G4VhElectronicStoppingPower::G4VhElectronicSto 58 G4VhElectronicStoppingPower::G4VhElectronicStoppingPower():
59 theHeMassAMU(4.0026) 59 theHeMassAMU(4.0026)
60 {;} 60 {;}
61 61
62 //....oooOO0OOooo........oooOO0OOooo........oo 62 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
63 63
64 G4VhElectronicStoppingPower::~G4VhElectronicSt 64 G4VhElectronicStoppingPower::~G4VhElectronicStoppingPower()
65 {;} 65 {;}
66 66
67 //....oooOO0OOooo........oooOO0OOooo........oo 67 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
68 68
69 G4double G4VhElectronicStoppingPower::HeEffCha 69 G4double G4VhElectronicStoppingPower::HeEffChargeSquare(
70 const G4 70 const G4double z,
71 const G4 71 const G4double kineticEnergyHe) const
72 { 72 {
73 // The aproximation of He effective charge f 73 // The aproximation of He effective charge from:
74 // J.F.Ziegler, J.P. Biersack, U. Littmark 74 // J.F.Ziegler, J.P. Biersack, U. Littmark
75 // The Stopping and Range of Ions in Matter, 75 // The Stopping and Range of Ions in Matter,
76 // Vol.1, Pergamon Press, 1985 76 // Vol.1, Pergamon Press, 1985
77 77
78 static const G4double c[6] = {0.2865, 0.126 78 static const G4double c[6] = {0.2865, 0.1266, -0.001429,
79 0.02402,-0.01135, 0.001475} ; 79 0.02402,-0.01135, 0.001475} ;
80 80
81 G4double e = std::log( std::max( 1.0, kineti 81 G4double e = std::log( std::max( 1.0, kineticEnergyHe/(keV*GetHeMassAMU()))) ;
82 G4double x = c[0] ; 82 G4double x = c[0] ;
83 G4double y = 1.0 ; 83 G4double y = 1.0 ;
84 for (G4int i=1; i<6; i++) { 84 for (G4int i=1; i<6; i++) {
85 y *= e ; 85 y *= e ;
86 x += y * c[i] ; 86 x += y * c[i] ;
87 } 87 }
88 88
89 G4double w = 7.6 - e ; 89 G4double w = 7.6 - e ;
90 w = 1.0 + (0.007 + 0.00005*z) * G4Exp( -w*w 90 w = 1.0 + (0.007 + 0.00005*z) * G4Exp( -w*w ) ;
91 w = 4.0 * (1.0 - G4Exp(-x)) * w * w ; 91 w = 4.0 * (1.0 - G4Exp(-x)) * w * w ;
92 return w; 92 return w;
93 } 93 }
94 94