Geant4  10.01.p02
G4hZiegler1985Nuclear.cc
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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 //
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53 
54 #include "G4hZiegler1985Nuclear.hh"
55 
56 #include "globals.hh"
57 #include "Randomize.hh"
58 #include "G4SystemOfUnits.hh"
59 #include "G4UnitsTable.hh"
60 
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62 
64 {;}
65 
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67 
69 {;}
70 
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72 
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 
98  ionloss *= G4RandGauss::shoot(1.0,sig) ;
99  }
100 
101  ionloss *= 8.462 * z1 * z2 * m1 / rm ; // Return to [ev/(10^15 atoms/cm^2]
102 
103  if ( ionloss < 0.0) ionloss = 0.0 ;
104 
105  return ionloss;
106 }
107 
108 
109 
110 
111 
ThreeVector shoot(const G4int Ap, const G4int Af)
G4double NuclearStoppingPower(G4double kineticEnergy, G4double z1, G4double z2, G4double m1, G4double m2) const
G4double energy(const ThreeVector &p, const G4double m)
static const double keV
Definition: G4SIunits.hh:195
double G4double
Definition: G4Types.hh:76