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This commit is contained in:
Gabriele Cosmo
2020-06-26 10:23:25 +02:00
parent c02c370437
commit 67ba86d073
1871 changed files with 174422 additions and 131884 deletions
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source/processes/cuts/src/G4RToEConvForPositron.cc
+33 -39
View File
@@ -23,13 +23,10 @@
// * acceptance of all terms of the Geant4 Software license. *
// ********************************************************************
//
// G4RToEConvForPositron class implementation
//
//
//
// --------------------------------------------------------------
// GEANT 4 class implementation file/ History:
// 5 Oct. 2002, H.Kuirashige : Structure created based on object model
// --------------------------------------------------------------
// Author: H.Kurashige, 05 October 2002 - First implementation
// --------------------------------------------------------------------
#include "G4RToEConvForPositron.hh"
#include "G4ParticleDefinition.hh"
@@ -41,46 +38,44 @@
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
// --------------------------------------------------------------------
G4RToEConvForPositron::G4RToEConvForPositron()
: G4VRangeToEnergyConverter(),
Mass(0.0),
Z(-1.),
taul(0.0),
ionpot(0.0),
ionpotlog(-1.0e-10),
bremfactor(0.1)
: G4VRangeToEnergyConverter()
{
theParticle = G4ParticleTable::GetParticleTable()->FindParticle("e+");
if (theParticle ==0) {
theParticle = G4ParticleTable::GetParticleTable()->FindParticle("e+");
if (theParticle == nullptr)
{
#ifdef G4VERBOSE
if (GetVerboseLevel()>0) {
G4cout << " G4RToEConvForPositron::G4RToEConvForPositron() ";
G4cout << " Positron is not defined !!" << G4endl;
if (GetVerboseLevel()>0)
{
G4cout << "G4RToEConvForPositron::G4RToEConvForPositron() - ";
G4cout << "Positron is not defined !!" << G4endl;
}
#endif
} else {
}
else
{
Mass = theParticle->GetPDGMass();
}
}
// --------------------------------------------------------------------
G4RToEConvForPositron::~G4RToEConvForPositron()
{
}
// **********************************************************************
// ************************* ComputeLoss ********************************
// **********************************************************************
G4double G4RToEConvForPositron::ComputeLoss(G4double AtomicNumber,
G4double KineticEnergy)
G4double KineticEnergy)
{
const G4double cbr1=0.02, cbr2=-5.7e-5, cbr3=1., cbr4=0.072;
const G4double Tlow=10.*keV, Thigh=1.*GeV;
const G4double cbr1=0.02, cbr2=-5.7e-5, cbr3=1., cbr4=0.072;
const G4double Tlow=10.*keV, Thigh=1.*GeV;
// calculate dE/dx for electrons
if( std::fabs(AtomicNumber-Z)>0.1 ) {
// calculate dE/dx for electrons
if( std::fabs(AtomicNumber-Z)>0.1 )
{
Z = AtomicNumber;
taul = Tlow/Mass;
ionpot = 1.6e-5*MeV*std::exp(0.9*std::log(Z))/Mass;
@@ -90,39 +85,38 @@ G4double G4RToEConvForPositron::ComputeLoss(G4double AtomicNumber,
G4double tau = KineticEnergy/Mass;
G4double dEdx;
if(tau<taul)
if(tau<taul)
{
G4double t1 = taul+1.;
G4double t2 = taul+2.;
G4double tsq = taul*taul;
G4double beta2 = taul*t2/(t1*t1);
G4double f = 2.*std::log(taul)
-(6.*taul+1.5*tsq-taul*(1.-tsq/3.)/t2-tsq*(0.5-tsq/12.)/
(t2*t2))/(t1*t1);
-(6.*taul+1.5*tsq-taul*(1.-tsq/3.)/t2
-tsq*(0.5-tsq/12.)/(t2*t2))/(t1*t1);
dEdx = (std::log(2.*taul+4.)-2.*ionpotlog+f)/beta2;
dEdx = twopi_mc2_rcl2*Z*dEdx;
G4double clow = dEdx*std::sqrt(taul);
dEdx = clow/std::sqrt(KineticEnergy/Mass);
} else {
G4double t1 = tau+1.;
}
else
{
G4double t1 = tau+1.;
G4double t2 = tau+2.;
G4double tsq = tau*tau;
G4double beta2 = tau*t2/(t1*t1);
G4double f = 2.*std::log(tau)
- (6.*tau+1.5*tsq-tau*(1.-tsq/3.)/t2-tsq*(0.5-tsq/12.)/
(t2*t2))/(t1*t1);
- (6.*tau+1.5*tsq-tau*(1.-tsq/3.)/t2
-tsq*(0.5-tsq/12.)/(t2*t2))/(t1*t1);
dEdx = (std::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*std::log(KineticEnergy/Thigh));
* (cbr3+cbr4*std::log(KineticEnergy/Thigh));
cbrem = Z*(Z+1.)*cbrem*tau/beta2;
cbrem *= bremfactor ;
cbrem *= bremfactor;
dEdx += twopi_mc2_rcl2*cbrem;
}
return dEdx;
}