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This commit is contained in:
Gabriele Cosmo
2016-06-09 10:15:15 +02:00
parent 37fff30d2e
commit fbd4999cf7
4396 changed files with 56662 additions and 52446 deletions
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source/particles/leptons/src/G4Positron.cc
+2 -79
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@@ -21,8 +21,8 @@
// ********************************************************************
//
//
// $Id: G4Positron.cc,v 1.6 2001/10/16 08:16:18 kurasige Exp $
// GEANT4 tag $Name: geant4-05-00 $
// $Id: G4Positron.cc,v 1.7 2002/12/16 11:15:42 gcosmo Exp $
// GEANT4 tag $Name: geant4-05-01 $
//
//
// ----------------------------------------------------------------------
@@ -84,83 +84,6 @@ G4Positron G4Positron::thePositron(
G4Positron* G4Positron::PositronDefinition() {return &thePositron;}
// **********************************************************************
// ************************* ComputeLoss ********************************
// **********************************************************************
G4double G4Positron::ComputeLoss(G4double AtomicNumber,
G4double KineticEnergy) const
{
static G4double Z;
static G4double taul, ionpot, ionpotlog;
const G4double cbr1=0.02, cbr2=-5.7e-5, cbr3=1., cbr4=0.072;
const G4double Tlow=10.*keV, Thigh=1.*GeV;
static G4double bremfactor = 0.1 ;
// calculate dE/dx for electrons
if( abs(AtomicNumber-Z)>0.1 )
{
Z = AtomicNumber;
taul = Tlow/GetPDGMass();
ionpot = 1.6e-5*MeV*exp(0.9*log(Z))/GetPDGMass();
ionpotlog = log(ionpot);
}
G4double tau = KineticEnergy/GetPDGMass();
G4double dEdx;
if(tau<taul)
{
G4double t1 = taul+1.;
G4double t2 = taul+2.;
G4double tsq = taul*taul;
G4double beta2 = taul*t2/(t1*t1);
G4double f = 2.*log(taul)
-(6.*taul+1.5*tsq-taul*(1.-tsq/3.)/t2-tsq*(0.5-tsq/12.)/
(t2*t2))/(t1*t1);
dEdx = (log(2.*taul+4.)-2.*ionpotlog+f)/beta2;
dEdx = twopi_mc2_rcl2*Z*dEdx;
G4double clow = dEdx*sqrt(taul);
dEdx = clow/sqrt(KineticEnergy/GetPDGMass());
} else {
G4double t1 = tau+1.;
G4double t2 = tau+2.;
G4double tsq = tau*tau;
G4double beta2 = tau*t2/(t1*t1);
G4double f = 2.*log(tau)
- (6.*tau+1.5*tsq-tau*(1.-tsq/3.)/t2-tsq*(0.5-tsq/12.)/
(t2*t2))/(t1*t1);
dEdx = (log(2.*tau+4.)-2.*ionpotlog+f)/beta2;
dEdx = twopi_mc2_rcl2*Z*dEdx;
// loss from bremsstrahlung follows
G4double cbrem = (cbr1+cbr2*Z)
*(cbr3+cbr4*log(KineticEnergy/Thigh));
cbrem = Z*(Z+1.)*cbrem*tau/beta2;
cbrem *= bremfactor ;
dEdx += twopi_mc2_rcl2*cbrem;
}
return dEdx;
}
// **********************************************************************
// *********************** BuildRangeVector *****************************
// **********************************************************************
void G4Positron::BuildRangeVector(const G4Material* aMaterial,
const G4LossTable* aLossTable,
G4double maxEnergy,
G4double aMass,
G4PhysicsLogVector* rangeVector)
{
G4Electron* pElectron = G4Electron::ElectronDefinition();
pElectron->BuildRangeVector(aMaterial,
aLossTable,
maxEnergy,
aMass,
rangeVector);
}
G4Positron* G4Positron::Positron()
{
return &thePositron;