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This commit is contained in:
Gabriele Cosmo
2016-06-09 12:11:21 +02:00
parent 516dbf1a58
commit d93e1e39a9
5384 changed files with 125662 additions and 82444 deletions
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source/processes/electromagnetic/utils/src/G4ionEffectiveCharge.cc
+13 -9
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@@ -20,8 +20,8 @@
// * statement, and all its terms. *
// ********************************************************************
//
// $Id: G4ionEffectiveCharge.cc,v 1.6 2004/12/01 18:01:01 vnivanch Exp $
// GEANT4 tag $Name: geant4-07-00-cand-03 $
// $Id: G4ionEffectiveCharge.cc,v 1.10 2005/02/27 18:07:33 vnivanch Exp $
// GEANT4 tag $Name: geant4-07-01 $
//
// -------------------------------------------------------------------
//
@@ -36,6 +36,7 @@
//
// Modifications:
// 12.09.2004 Set low energy limit to 1 keV (V.Ivanchenko)
// 25.01.2005 Add protection - min Charge 0.1 eplus (V.Ivanchenko)
//
// -------------------------------------------------------------------
@@ -53,12 +54,11 @@
G4ionEffectiveCharge::G4ionEffectiveCharge()
{
chargeCorrection = 1.0;
// energyHighLimit = 1.*MeV;
energyHighLimit = 25.*MeV;
// energyLowLimit = 3.25*keV;
energyHighLimit = 10.0*MeV;
energyLowLimit = 1.0*keV;
energyBohr = 25.*keV;
massFactor = amu_c2/(proton_mass_c2*keV);
minCharge = 0.1;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
@@ -152,6 +152,7 @@ G4double G4ionEffectiveCharge::EffectiveCharge(const G4ParticleDefinition* p,
reducedEnergy = std::max(reducedEnergy,energyLowLimit);
G4double q;
// Helium ion case
if( Zi < 2.5 ) {
@@ -172,7 +173,7 @@ G4double G4ionEffectiveCharge::EffectiveCharge(const G4ParticleDefinition* p,
G4double zi13 = std::pow(Zi, 0.33333);
G4double zi23 = zi13*zi13;
reducedEnergy = std::max(reducedEnergy,energyBohr/z23);
// v1 is ion velocity in vF unit
G4double v1 = std::sqrt( reducedEnergy / energyBohr )/ vF ;
G4double y ;
@@ -189,18 +190,21 @@ G4double G4ionEffectiveCharge::EffectiveCharge(const G4ParticleDefinition* p,
G4double y3 = std::pow(y, 0.3) ;
// G4cout << "y= " << y << " y3= " << y3 << " v1= " << v1 << " vF= " << vF << G4endl;
q = 1.0 - std::exp( 0.803*y3 - 1.3167*y3*y3 - 0.38157*y - 0.008983*y*y ) ;
if(q < 0.0) q = 0.0;
G4double qmin = minCharge/Zi;
if(q < qmin) q = qmin;
G4double tq = 7.6 - std::log(reducedEnergy/keV);
G4double sq = 1.0 + ( 0.18 + 0.0015 * z ) * std::exp( -tq*tq )/ (Zi*Zi);
// G4cout << "sq= " << sq << G4endl;
// Screen length according to
// J.F.Ziegler and J.M.Manoyan, The stopping of ions in compaunds,
// Nucl. Inst. & Meth. in Phys. Res. B35 (1988) 215-228.
G4double lambda = 10.0 * vF * std::pow(1.0-q, 0.6667) / (zi13 * (6.0 + q)) ;
chargeCorrection = sq * (q + 0.5*(1.0 - q)*std::log(1.0 + lambda*lambda)/(vF*vF) );
if(q > 0.0) chargeCorrection /= q;
chargeCorrection = sq * (1.0 + (0.5/q - 0.5)*std::log(1.0 + lambda*lambda)/(vF*vF) );
}
// G4cout << "G4ionEffectiveCharge: charge= " << charge << " q= " << q
// << " chargeCor= " << chargeCorrection