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>> 1 // This code implementation is the intellectual property of
>> 2 // the GEANT4 collaboration.
1 // 3 //
2 // ******************************************* << 4 // By copying, distributing or modifying the Program (or any work
3 // * License and Disclaimer << 5 // based on the Program) you indicate your acceptance of this statement,
4 // * << 6 // and all its terms.
5 // * The Geant4 software is copyright of th <<
6 // * the Geant4 Collaboration. It is provided <<
7 // * conditions of the Geant4 Software License <<
8 // * LICENSE and available at http://cern.ch/ <<
9 // * include a list of copyright holders. <<
10 // * <<
11 // * Neither the authors of this software syst <<
12 // * institutes,nor the agencies providing fin <<
13 // * work make any representation or warran <<
14 // * regarding this software system or assum <<
15 // * use. Please see the license in the file <<
16 // * for the full disclaimer and the limitatio <<
17 // * <<
18 // * This code implementation is the result <<
19 // * technical work of the GEANT4 collaboratio <<
20 // * By using, copying, modifying or distri <<
21 // * any work based on the software) you ag <<
22 // * use in resulting scientific publicati <<
23 // * acceptance of all terms of the Geant4 Sof <<
24 // ******************************************* <<
25 // <<
26 // 7 //
27 // ------------------------------------------- 8 // -------------------------------------------------------------------
28 // 9 //
29 // GEANT4 Class file 10 // GEANT4 Class file
30 // 11 //
>> 12 // For information related to this code contact:
>> 13 // Geant4 Collaboration
31 // 14 //
32 // File name: G4VhElectronicStoppingPower 15 // File name: G4VhElectronicStoppingPower
33 // 16 //
34 // Author: V.Ivanchenko (Vladimir.Ivanc 17 // Author: V.Ivanchenko (Vladimir.Ivanchenko@cern.ch)
35 // << 18 //
36 // Creation date: 20 July 2000 19 // Creation date: 20 July 2000
37 // 20 //
38 // Modifications: << 21 // Modifications:
39 // 20/07/2000 V.Ivanchenko First implementati 22 // 20/07/2000 V.Ivanchenko First implementation
40 // 23 //
41 // Class Description: << 24 // Class Description:
42 // 25 //
43 // Low energy hadrons/ions electronic stopping 26 // Low energy hadrons/ions electronic stopping power parametrisation
44 // 27 //
45 // Class Description: End << 28 // Class Description: End
46 // 29 //
47 // ------------------------------------------- 30 // -------------------------------------------------------------------
48 // 31 //
49 //....oooOO0OOooo........oooOO0OOooo........oo 32 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
50 33
51 #include "G4VhElectronicStoppingPower.hh" << 34 #include "G4VhElectronicStoppingPower.hh"
52 #include "G4SystemOfUnits.hh" <<
53 #include "G4UnitsTable.hh" 35 #include "G4UnitsTable.hh"
54 #include "G4Exp.hh" <<
55 36
56 //....oooOO0OOooo........oooOO0OOooo........oo 37 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
57 38
58 G4VhElectronicStoppingPower::G4VhElectronicSto 39 G4VhElectronicStoppingPower::G4VhElectronicStoppingPower():
59 theHeMassAMU(4.0026) 40 theHeMassAMU(4.0026)
60 {;} 41 {;}
61 42
62 //....oooOO0OOooo........oooOO0OOooo........oo 43 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
63 44
64 G4VhElectronicStoppingPower::~G4VhElectronicSt << 45 G4VhElectronicStoppingPower::~G4VhElectronicStoppingPower()
65 {;} 46 {;}
66 47
67 //....oooOO0OOooo........oooOO0OOooo........oo 48 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
68 << 49
69 G4double G4VhElectronicStoppingPower::HeEffCha 50 G4double G4VhElectronicStoppingPower::HeEffChargeSquare(
70 const G4 << 51 const G4double z,
71 const G4 52 const G4double kineticEnergyHe) const
72 { 53 {
73 // The aproximation of He effective charge f << 54 // The aproximation of He effective charge from:
74 // J.F.Ziegler, J.P. Biersack, U. Littmark 55 // J.F.Ziegler, J.P. Biersack, U. Littmark
75 // The Stopping and Range of Ions in Matter, 56 // The Stopping and Range of Ions in Matter,
76 // Vol.1, Pergamon Press, 1985 57 // Vol.1, Pergamon Press, 1985
77 58
78 static const G4double c[6] = {0.2865, 0.126 << 59 static G4double c[6] = {0.2865, 0.1266, -0.001429,
79 0.02402,-0.01135, 0.001475} ; << 60 0.02402,-0.01135, 0.001475} ;
80 61
81 G4double e = std::log( std::max( 1.0, kineti << 62 G4double e = log( G4std::max( 1.0, kineticEnergyHe/(keV*GetHeMassAMU()))) ;
82 G4double x = c[0] ; 63 G4double x = c[0] ;
83 G4double y = 1.0 ; 64 G4double y = 1.0 ;
84 for (G4int i=1; i<6; i++) { 65 for (G4int i=1; i<6; i++) {
85 y *= e ; 66 y *= e ;
86 x += y * c[i] ; 67 x += y * c[i] ;
87 } 68 }
88 69
89 G4double w = 7.6 - e ; 70 G4double w = 7.6 - e ;
90 w = 1.0 + (0.007 + 0.00005*z) * G4Exp( -w*w << 71 w = 1.0 + (0.007 + 0.00005*z) * exp( -w*w ) ;
91 w = 4.0 * (1.0 - G4Exp(-x)) * w * w ; << 72 w = 4.0 * (1.0 - exp(-x)) * w * w ;
>> 73
92 return w; 74 return w;
93 } 75 }
94 76