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1 //
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25 //
26 //
27 // -------------------------------------------------------------------
28 //
29 // GEANT4 Class file
30 //
31 //
32 // File name: G4hZiegler1985Nuclear
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 // Nuclear stopping power parametrised according to
44 // J.F.Ziegler, J.P. Biersack, U. Littmark
45 // The Stopping and Range of Ions in Matter,
46 // Vol.1, Pergamon Press, 1985
47 //
48 // Class Description: End
49 //
50 // -------------------------------------------------------------------
51 //
52 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
53
54 #include "G4hZiegler1985Nuclear.hh"
55
56 #include "globals.hh"
57 #include "Randomize.hh"
58 #include "G4SystemOfUnits.hh"
59 #include "G4UnitsTable.hh"
60
61 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
62
63 G4hZiegler1985Nuclear::G4hZiegler1985Nuclear():G4VhNuclearStoppingPower()
64 {;}
65
66 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
67
68 G4hZiegler1985Nuclear::~G4hZiegler1985Nuclear()
69 {;}
70
71 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
72
73 G4double G4hZiegler1985Nuclear::NuclearStoppingPower(G4double kineticEnergy,
74 G4double z1, G4double z2,
75 G4double m1, G4double m2Local) const
76 {
77 G4double energy = kineticEnergy/keV ; // energy in keV
78 G4double ionloss ;
79
80 G4double rm = (m1 + m2Local) * ( std::pow(z1, .23) + std::pow(z2, .23)) ;
81
82 G4double er = 32.536 * m2Local * energy / ( z1 * z2 * rm ) ; // reduced energy
83
84 if ( er <= 30 ) {
85 ionloss = 0.5*std::log(1+1.1383*er)/
86 (er+0.01312*std::pow(er,0.21226)+0.19593*std::sqrt(er)) ;
87
88 } else {
89 ionloss = 0.5*std::log(er)/er ;
90 }
91
92 // Stragling
93 if(lossFlucFlag) {
94 G4double sig = 4.0 * m1 * m2Local / ((m1 + m2Local)*(m1 + m2Local)*
95 (4.0 + 0.197*std::pow(er,-1.6991)+6.584*std::pow(er,-1.0494))) ;
96
97 ionloss *= G4RandGauss::shoot(1.0,sig) ;
98 }
99
100 ionloss *= 8.462 * z1 * z2 * m1 / rm ; // Return to [ev/(10^15 atoms/cm^2]
101
102 if ( ionloss < 0.0) ionloss = 0.0 ;
103
104 return ionloss;
105 }
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111