source: trunk/source/processes/electromagnetic/lowenergy/src/G4hICRU49Nuclear.cc@ 1005

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// -------------------------------------------------------------------
//
// GEANT4 Class file
//
//
// File name:     G4hICRU49Nuclear
//
// Author:        V.Ivanchenko (Vladimir.Ivanchenko@cern.ch)
// 
// Creation date: 20 July 2000
//
// Modifications: 
// 20/07/2000  V.Ivanchenko First implementation
// 10/05/2001  V.Ivanchenko Clean up againist Linux compilation with -Wall
//
// Class Description: 
//
// Nuclear stopping power parametrised according to
// ICRU Report N49, 1993. Moliere model.
// G.Moliere "Theorie der Streuung schneller geladener Teilchen I;
// Einzelstreuungam abbgeschirmten Coulomb-Feld" Z. f. Naturforsch, A2,
// 133 (1947).
//
// Class Description: End 
//
// -------------------------------------------------------------------
//
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....

#include "G4hICRU49Nuclear.hh"
#include "G4UnitsTable.hh"
#include "globals.hh"
#include "Randomize.hh"

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....

G4hICRU49Nuclear::G4hICRU49Nuclear():G4VhNuclearStoppingPower()
{;}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....

G4hICRU49Nuclear::~G4hICRU49Nuclear() 
{;}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....

G4double G4hICRU49Nuclear::NuclearStoppingPower(G4double kineticEnergy,
                                G4double z1, G4double z2, 
                                G4double m1, G4double m2) const
{  
  G4double energy = kineticEnergy/keV ;  // energy in keV
  G4double ionloss = 0.0;
  
  G4double rm = (m1 + m2) * ( std::pow(z1, .23) + std::pow(z2, .23) ) ;

  G4double er = 32.536 * m2 * energy / ( z1 * z2 * rm ) ;  // reduced energy

  static G4double a[104][2] = {
  { 1.0E+8, 5.831E-8},
  { 8.0E+7, 7.288E-8},
  { 6.0E+7, 9.719E-8},
  { 5.0E+7, 1.166E-7},
  { 4.0E+7, 1.457E-7},
  { 3.0E+7, 1.942E-7},
  { 2.0E+7, 2.916E-7},
  { 1.5E+7, 3.887E-7},

  { 1.0E+7, 5.833E-7},
  { 8.0E+6, 7.287E-7},
  { 6.0E+6, 9.712E-7},
  { 5.0E+6, 1.166E-6},
  { 4.0E+6, 1.457E-6},
  { 3.0E+6, 1.941E-6},
  { 2.0E+6, 2.911E-6},
  { 1.5E+6, 3.878E-6},

  { 1.0E+6, 5.810E-6},
  { 8.0E+5, 7.262E-6},
  { 6.0E+5, 9.663E-6},
  { 5.0E+5, 1.157E-5},
  { 4.0E+5, 1.442E-5},
  { 3.0E+5, 1.913E-5},
  { 2.0E+5, 2.845E-5},
  { 1.5E+5, 3.762E-5},

  { 1.0E+5, 5.554E-5},
  { 8.0E+4, 6.866E-5},
  { 6.0E+4, 9.020E-5},
  { 5.0E+4, 1.070E-4},
  { 4.0E+4, 1.319E-4},
  { 3.0E+4, 1.722E-4},
  { 2.0E+4, 2.499E-4},
  { 1.5E+4, 3.248E-4},

  { 1.0E+4, 4.688E-4},
  { 8.0E+3, 5.729E-4},
  { 6.0E+3, 7.411E-4},
  { 5.0E+3, 8.718E-4},
  { 4.0E+3, 1.063E-3},
  { 3.0E+3, 1.370E-3},
  { 2.0E+3, 1.955E-3},
  { 1.5E+3, 2.511E-3},

  { 1.0E+3, 3.563E-3},
  { 8.0E+2, 4.314E-3},
  { 6.0E+2, 5.511E-3},
  { 5.0E+2, 6.430E-3},
  { 4.0E+2, 7.756E-3},
  { 3.0E+2, 9.855E-3},
  { 2.0E+2, 1.375E-2},
  { 1.5E+2, 1.736E-2},

  { 1.0E+2, 2.395E-2},
  { 8.0E+1, 2.850E-2},
  { 6.0E+1, 3.552E-2},
  { 5.0E+1, 4.073E-2},
  { 4.0E+1, 4.802E-2},
  { 3.0E+1, 5.904E-2},
  { 1.5E+1, 9.426E-2},

  { 1.0E+1, 1.210E-1},
  { 8.0E+0, 1.377E-1},
  { 6.0E+0, 1.611E-1},
  { 5.0E+0, 1.768E-1},
  { 4.0E+0, 1.968E-1},
  { 3.0E+0, 2.235E-1},
  { 2.0E+0, 2.613E-1},
  { 1.5E+0, 2.871E-1},

  { 1.0E+0, 3.199E-1},
  { 8.0E-1, 3.354E-1},
  { 6.0E-1, 3.523E-1},
  { 5.0E-1, 3.609E-1},
  { 4.0E-1, 3.693E-1},
  { 3.0E-1, 3.766E-1},
  { 2.0E-1, 3.803E-1},
  { 1.5E-1, 3.788E-1},

  { 1.0E-1, 3.711E-1},
  { 8.0E-2, 3.644E-1},
  { 6.0E-2, 3.530E-1},
  { 5.0E-2, 3.444E-1},
  { 4.0E-2, 3.323E-1},
  { 3.0E-2, 3.144E-1},
  { 2.0E-2, 2.854E-1},
  { 1.5E-2, 2.629E-1},

  { 1.0E-2, 2.298E-1},
  { 8.0E-3, 2.115E-1},
  { 6.0E-3, 1.883E-1},
  { 5.0E-3, 1.741E-1},
  { 4.0E-3, 1.574E-1},
  { 3.0E-3, 1.372E-1},
  { 2.0E-3, 1.116E-1},
  { 1.5E-3, 9.559E-2},

  { 1.0E-3, 7.601E-2},
  { 8.0E-4, 6.668E-2},
  { 6.0E-4, 5.605E-2},
  { 5.0E-4, 5.008E-2},
  { 4.0E-4, 4.352E-2},
  { 3.0E-4, 3.617E-2},
  { 2.0E-4, 2.768E-2},
  { 1.5E-4, 2.279E-2},

  { 1.0E-4, 1.723E-2},
  { 8.0E-5, 1.473E-2},
  { 6.0E-5, 1.200E-2},
  { 5.0E-5, 1.052E-2},
  { 4.0E-5, 8.950E-3},
  { 3.0E-5, 7.246E-3},
  { 2.0E-5, 5.358E-3},
  { 1.5E-5, 4.313E-3},
  { 0.0, 3.166E-3}
  };
  
  for (G4int i=1; i<104; i++)
    {
      if (er > a[i][0]) {
        ionloss = 
         (a[i][1]-a[i-1][1])*(er-a[i-1][0])/(a[i][0]-a[i-1][0])+a[i-1][1];   
        break;
      }
    }

  // Stragling
  if(lossFlucFlag) {
    G4double sig = 4.0 * m1 * m2 / ((m1 + m2)*(m1 + m2)*
                  (4.0 + 0.197*std::pow(er,-1.6991)+6.584*std::pow(er,-1.0494))) ;

    ionloss *= G4RandGauss::shoot(1.0,sig) ;
  } 
   
  ionloss *= 8.462 * z1 * z2 * m1 / rm ; // Return to [ev/(10^15 atoms/cm^2]

  if ( ionloss < 0.0) ionloss = 0.0 ;
  
  return ionloss;
}