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286caacf0615ab1ea1652d253dbac6f63224dae6
geant4/source/processes/electromagnetic/muons/src/G4MuPairProductionModel.cc
T
Gabriele Cosmo 286caacf06 Import Geant4 10.0.0 source tree
2016-06-10 11:51:14 +02:00

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//
// ********************************************************************
// * License and Disclaimer *
// * *
// * The Geant4 software is copyright of the Copyright Holders of *
// * the Geant4 Collaboration. It is provided under the terms and *
// * conditions of the Geant4 Software License, included in the file *
// * LICENSE and available at http://cern.ch/geant4/license . These *
// * include a list of copyright holders. *
// * *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work make any representation or warranty, express or implied, *
// * regarding this software system or assume any liability for its *
// * use. Please see the license in the file LICENSE and URL above *
// * for the full disclaimer and the limitation of liability. *
// * *
// * This code implementation is the result of the scientific and *
// * technical work of the GEANT4 collaboration. *
// * By using, copying, modifying or distributing the software (or *
// * any work based on the software) you agree to acknowledge its *
// * use in resulting scientific publications, and indicate your *
// * acceptance of all terms of the Geant4 Software license. *
// ********************************************************************
//
// $Id: G4MuPairProductionModel.cc 74544 2013-10-14 12:40:29Z gcosmo $
//
// -------------------------------------------------------------------
//
// GEANT4 Class file
//
//
// File name: G4MuPairProductionModel
//
// Author: Vladimir Ivanchenko on base of Laszlo Urban code
//
// Creation date: 24.06.2002
//
// Modifications:
//
// 04-12-02 Change G4DynamicParticle constructor in PostStep (V.Ivanchenko)
// 23-12-02 Change interface in order to move to cut per region (V.Ivanchenko)
// 24-01-03 Fix for compounds (V.Ivanchenko)
// 27-01-03 Make models region aware (V.Ivanchenko)
// 13-02-03 Add model (V.Ivanchenko)
// 06-06-03 Fix in cross section calculation for high energy (V.Ivanchenko)
// 20-10-03 2*xi in ComputeDDMicroscopicCrossSection (R.Kokoulin)
// 8 integration points in ComputeDMicroscopicCrossSection
// 12-01-04 Take min cut of e- and e+ not its sum (V.Ivanchenko)
// 10-02-04 Update parameterisation using R.Kokoulin model (V.Ivanchenko)
// 28-04-04 For complex materials repeat calculation of max energy for each
// material (V.Ivanchenko)
// 01-11-04 Fix bug inside ComputeDMicroscopicCrossSection (R.Kokoulin)
// 08-04-05 Major optimisation of internal interfaces (V.Ivantchenko)
// 03-08-05 Add SetParticle method (V.Ivantchenko)
// 23-10-05 Add protection in sampling of e+e- pair energy needed for
// low cuts (V.Ivantchenko)
// 13-02-06 Add ComputeCrossSectionPerAtom (mma)
// 24-04-07 Add protection in SelectRandomAtom method (V.Ivantchenko)
// 12-05-06 Updated sampling (use cut) in SelectRandomAtom (A.Bogdanov)
// 11-10-07 Add ignoreCut flag (V.Ivanchenko)
//
// Class Description:
//
//
// -------------------------------------------------------------------
//
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
#include "G4MuPairProductionModel.hh"
#include "G4PhysicalConstants.hh"
#include "G4SystemOfUnits.hh"
#include "G4Electron.hh"
#include "G4Positron.hh"
#include "G4MuonMinus.hh"
#include "G4MuonPlus.hh"
#include "Randomize.hh"
#include "G4Material.hh"
#include "G4Element.hh"
#include "G4ElementVector.hh"
#include "G4ProductionCutsTable.hh"
#include "G4ParticleChangeForLoss.hh"
#include "G4ParticleChangeForGamma.hh"
#include "G4Log.hh"
#include "G4Exp.hh"
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
// static members
//
const G4int G4MuPairProductionModel::zdat[]={1, 4, 13, 29, 92};
const G4double G4MuPairProductionModel::adat[]={1.01, 9.01,26.98, 63.55, 238.03};
const G4double G4MuPairProductionModel::xgi[]={ 0.0199, 0.1017, 0.2372, 0.4083,
0.5917, 0.7628, 0.8983, 0.9801 };
const G4double G4MuPairProductionModel::wgi[]={ 0.0506, 0.1112, 0.1569, 0.1813,
0.1813, 0.1569, 0.1112, 0.0506 };
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
using namespace std;
G4MuPairProductionModel::G4MuPairProductionModel(const G4ParticleDefinition* p,
const G4String& nam)
: G4VEmModel(nam),
particle(0),
factorForCross(4.*fine_structure_const*fine_structure_const
*classic_electr_radius*classic_electr_radius/(3.*pi)),
sqrte(sqrt(G4Exp(1.))),
currentZ(0),
fParticleChange(0),
minPairEnergy(4.*electron_mass_c2),
lowestKinEnergy(1.0*GeV),
nzdat(5),
nYBinPerDecade(4),
nbiny(1000),
nbine(0),
ymin(-5.),
dy(0.005)
{
nist = G4NistManager::Instance();
theElectron = G4Electron::Electron();
thePositron = G4Positron::Positron();
particleMass = lnZ = z13 = z23 = 0;
// setup lowest limit dependent on particle mass
if(p) {
SetParticle(p);
G4double limit = p->GetPDGMass()*8;
if(limit > lowestKinEnergy) { lowestKinEnergy = limit; }
}
emin = lowestKinEnergy;
emax = 10*TeV;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
G4MuPairProductionModel::~G4MuPairProductionModel()
{}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
G4double G4MuPairProductionModel::MinPrimaryEnergy(const G4Material*,
const G4ParticleDefinition*,
G4double cut)
{
return std::max(lowestKinEnergy,cut);
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
void G4MuPairProductionModel::Initialise(const G4ParticleDefinition* p,
const G4DataVector& cuts)
{
SetParticle(p);
// define scale of internal table for each thread only once
if(0 == nbine) {
emax = HighEnergyLimit();
emin = std::max(lowestKinEnergy, LowEnergyLimit());
nbine = size_t(nYBinPerDecade*std::log10(emax/emin));
if(nbine < 3) { nbine = 3; }
ymin = G4Log(minPairEnergy/emin);
dy = -ymin/G4double(nbiny);
}
if(IsMaster() && p == particle) {
if(!fElementData) {
fElementData = new G4ElementData();
MakeSamplingTables();
}
InitialiseElementSelectors(p, cuts);
}
if(!fParticleChange) { fParticleChange = GetParticleChangeForLoss(); }
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
void G4MuPairProductionModel::InitialiseLocal(const G4ParticleDefinition* p,
G4VEmModel* masterModel)
{
if(p == particle) {
SetElementSelectors(masterModel->GetElementSelectors());
fElementData = masterModel->GetElementData();
}
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
G4double G4MuPairProductionModel::ComputeDEDXPerVolume(
const G4Material* material,
const G4ParticleDefinition*,
G4double kineticEnergy,
G4double cutEnergy)
{
G4double dedx = 0.0;
if (cutEnergy <= minPairEnergy || kineticEnergy <= lowestKinEnergy)
{ return dedx; }
const G4ElementVector* theElementVector = material->GetElementVector();
const G4double* theAtomicNumDensityVector =
material->GetAtomicNumDensityVector();
// loop for elements in the material
for (size_t i=0; i<material->GetNumberOfElements(); ++i) {
G4double Z = (*theElementVector)[i]->GetZ();
G4double tmax = MaxSecondaryEnergyForElement(kineticEnergy, Z);
G4double loss = ComputMuPairLoss(Z, kineticEnergy, cutEnergy, tmax);
dedx += loss*theAtomicNumDensityVector[i];
}
if (dedx < 0.) { dedx = 0.; }
return dedx;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
G4double G4MuPairProductionModel::ComputMuPairLoss(G4double Z,
G4double tkin,
G4double cutEnergy,
G4double tmax)
{
G4double loss = 0.0;
G4double cut = std::min(cutEnergy,tmax);
if(cut <= minPairEnergy) { return loss; }
// calculate the rectricted loss
// numerical integration in log(PairEnergy)
G4double ak1=6.9;
G4double ak2=1.0;
G4double aaa = G4Log(minPairEnergy);
G4double bbb = G4Log(cut);
G4int kkk = (G4int)((bbb-aaa)/ak1+ak2);
if (kkk > 8) { kkk = 8; }
else if (kkk < 1) { kkk = 1; }
G4double hhh = (bbb-aaa)/(G4double)kkk;
G4double x = aaa;
for (G4int l=0 ; l<kkk; l++)
{
for (G4int ll=0; ll<8; ll++)
{
G4double ep = G4Exp(x+xgi[ll]*hhh);
loss += wgi[ll]*ep*ep*ComputeDMicroscopicCrossSection(tkin, Z, ep);
}
x += hhh;
}
loss *= hhh;
if (loss < 0.) loss = 0.;
return loss;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
G4double G4MuPairProductionModel::ComputeMicroscopicCrossSection(
G4double tkin,
G4double Z,
G4double cutEnergy)
{
G4double cross = 0.;
G4double tmax = MaxSecondaryEnergyForElement(tkin, Z);
G4double cut = std::max(cutEnergy, minPairEnergy);
if (tmax <= cut) { return cross; }
G4double ak1=6.9 ;
G4double ak2=1.0 ;
G4double aaa = G4Log(cut);
G4double bbb = G4Log(tmax);
G4int kkk = (G4int)((bbb-aaa)/ak1 + ak2);
if(kkk > 8) { kkk = 8; }
else if (kkk < 1) { kkk = 1; }
G4double hhh = (bbb-aaa)/G4double(kkk);
G4double x = aaa;
for(G4int l=0; l<kkk; ++l)
{
for(G4int i=0; i<8; ++i)
{
G4double ep = G4Exp(x + xgi[i]*hhh);
cross += ep*wgi[i]*ComputeDMicroscopicCrossSection(tkin, Z, ep);
}
x += hhh;
}
cross *= hhh;
if(cross < 0.0) { cross = 0.0; }
return cross;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
G4double G4MuPairProductionModel::ComputeDMicroscopicCrossSection(
G4double tkin,
G4double Z,
G4double pairEnergy)
// Calculates the differential (D) microscopic cross section
// using the cross section formula of R.P. Kokoulin (18/01/98)
// Code modified by R.P. Kokoulin, V.N. Ivanchenko (27/01/04)
{
static const G4double bbbtf= 183. ;
static const G4double bbbh = 202.4 ;
static const G4double g1tf = 1.95e-5 ;
static const G4double g2tf = 5.3e-5 ;
static const G4double g1h = 4.4e-5 ;
static const G4double g2h = 4.8e-5 ;
G4double totalEnergy = tkin + particleMass;
G4double residEnergy = totalEnergy - pairEnergy;
G4double massratio = particleMass/electron_mass_c2 ;
G4double massratio2 = massratio*massratio ;
G4double cross = 0.;
G4double c3 = 0.75*sqrte*particleMass;
if (residEnergy <= c3*z13) { return cross; }
G4double c7 = 4.*CLHEP::electron_mass_c2;
G4double c8 = 6.*particleMass*particleMass;
G4double alf = c7/pairEnergy;
G4double a3 = 1. - alf;
if (a3 <= 0.) { return cross; }
// zeta calculation
G4double bbb,g1,g2;
if( Z < 1.5 ) { bbb = bbbh ; g1 = g1h ; g2 = g2h ; }
else { bbb = bbbtf; g1 = g1tf; g2 = g2tf; }
G4double zeta = 0;
G4double zeta1 =
0.073*G4Log(totalEnergy/(particleMass+g1*z23*totalEnergy))-0.26;
if ( zeta1 > 0.)
{
G4double zeta2 =
0.058*G4Log(totalEnergy/(particleMass+g2*z13*totalEnergy))-0.14;
zeta = zeta1/zeta2 ;
}
G4double z2 = Z*(Z+zeta);
G4double screen0 = 2.*electron_mass_c2*sqrte*bbb/(z13*pairEnergy);
G4double a0 = totalEnergy*residEnergy;
G4double a1 = pairEnergy*pairEnergy/a0;
G4double bet = 0.5*a1;
G4double xi0 = 0.25*massratio2*a1;
G4double del = c8/a0;
G4double rta3 = sqrt(a3);
G4double tmnexp = alf/(1. + rta3) + del*rta3;
if(tmnexp >= 1.0) { return cross; }
G4double tmn = G4Log(tmnexp);
G4double sum = 0.;
// Gaussian integration in ln(1-ro) ( with 8 points)
for (G4int i=0; i<8; ++i)
{
G4double a4 = G4Exp(tmn*xgi[i]); // a4 = (1.-asymmetry)
G4double a5 = a4*(2.-a4) ;
G4double a6 = 1.-a5 ;
G4double a7 = 1.+a6 ;
G4double a9 = 3.+a6 ;
G4double xi = xi0*a5 ;
G4double xii = 1./xi ;
G4double xi1 = 1.+xi ;
G4double screen = screen0*xi1/a5 ;
G4double yeu = 5.-a6+4.*bet*a7 ;
G4double yed = 2.*(1.+3.*bet)*G4Log(3.+xii)-a6-a1*(2.-a6) ;
G4double ye1 = 1.+yeu/yed ;
G4double ale = G4Log(bbb/z13*sqrt(xi1*ye1)/(1.+screen*ye1)) ;
G4double cre = 0.5*G4Log(1.+2.25*z23*xi1*ye1/massratio2) ;
G4double be;
if (xi <= 1.e3) {
be = ((2.+a6)*(1.+bet)+xi*a9)*G4Log(1.+xii)+(a5-bet)/xi1-a9;
} else {
be = (3.-a6+a1*a7)/(2.*xi);
}
G4double fe = (ale-cre)*be;
if ( fe < 0.) fe = 0. ;
G4double ymu = 4.+a6 +3.*bet*a7 ;
G4double ymd = a7*(1.5+a1)*G4Log(3.+xi)+1.-1.5*a6 ;
G4double ym1 = 1.+ymu/ymd ;
G4double alm_crm = G4Log(bbb*massratio/(1.5*z23*(1.+screen*ym1)));
G4double a10,bm;
if ( xi >= 1.e-3)
{
a10 = (1.+a1)*a5 ;
bm = (a7*(1.+1.5*bet)-a10*xii)*G4Log(xi1)+xi*(a5-bet)/xi1+a10;
} else {
bm = (5.-a6+bet*a9)*(xi/2.);
}
G4double fm = alm_crm*bm;
if ( fm < 0.) { fm = 0.; }
sum += wgi[i]*a4*(fe+fm/massratio2);
}
cross = -tmn*sum*factorForCross*z2*residEnergy/(totalEnergy*pairEnergy);
if(cross < 0.0) { cross = 0.0; }
return cross;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
G4double G4MuPairProductionModel::ComputeCrossSectionPerAtom(
const G4ParticleDefinition*,
G4double kineticEnergy,
G4double Z, G4double,
G4double cutEnergy,
G4double maxEnergy)
{
G4double cross = 0.0;
if (kineticEnergy <= lowestKinEnergy) { return cross; }
G4double maxPairEnergy = MaxSecondaryEnergyForElement(kineticEnergy, Z);
G4double tmax = std::min(maxEnergy, maxPairEnergy);
G4double cut = std::max(cutEnergy, minPairEnergy);
if (cut >= tmax) { return cross; }
cross = ComputeMicroscopicCrossSection(kineticEnergy, Z, cut);
if(tmax < kineticEnergy) {
cross -= ComputeMicroscopicCrossSection(kineticEnergy, Z, tmax);
}
return cross;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
void G4MuPairProductionModel::MakeSamplingTables()
{
G4double factore = G4Exp(G4Log(emax/emin)/G4double(nbine));
for (G4int iz=0; iz<nzdat; ++iz) {
G4double Z = zdat[iz];
G4Physics2DVector* pv = new G4Physics2DVector(nbiny+1,nbine+1);
G4double kinEnergy = emin;
for (size_t it=0; it<=nbine; ++it) {
pv->PutY(it, G4Log(kinEnergy/MeV));
G4double maxPairEnergy = MaxSecondaryEnergyForElement(kinEnergy, Z);
/*
G4cout << "it= " << it << " E= " << kinEnergy
<< " " << particle->GetParticleName()
<< " maxE= " << maxPairEnergy << " minE= " << minPairEnergy
<< " ymin= " << ymin << G4endl;
*/
G4double coef = G4Log(minPairEnergy/kinEnergy)/ymin;
G4double ymax = G4Log(maxPairEnergy/kinEnergy)/coef;
G4double fac = (ymax - ymin)/dy;
size_t imax = (size_t)fac;
fac -= (G4double)imax;
G4double xSec = 0.0;
G4double x = ymin;
/*
G4cout << "Z= " << currentZ << " z13= " << z13
<< " mE= " << maxPairEnergy << " ymin= " << ymin
<< " dy= " << dy << " c= " << coef << G4endl;
*/
// start from zero
pv->PutValue(0, it, 0.0);
if(0 == it) { pv->PutX(nbiny, 0.0); }
for (size_t i=0; i<nbiny; ++i) {
if(0 == it) { pv->PutX(i, x); }
if(i < imax) {
G4double ep = kinEnergy*G4Exp(coef*(x + dy*0.5));
// not multiplied by interval, because table
// will be used only for sampling
//G4cout << "i= " << i << " x= " << x << "E= " << kinEnergy
// << " Egamma= " << ep << G4endl;
xSec += ep*ComputeDMicroscopicCrossSection(kinEnergy, Z, ep);
// last bin before the kinematic limit
} else if(i == imax) {
G4double ep = kinEnergy*G4Exp(coef*(x + fac*dy*0.5));
xSec += ep*fac*ComputeDMicroscopicCrossSection(kinEnergy, Z, ep);
}
pv->PutValue(i + 1, it, xSec);
x += dy;
}
kinEnergy *= factore;
// to avoid precision lost
if(it+1 == nbine) { kinEnergy = emax; }
}
fElementData->InitialiseForElement(zdat[iz], pv);
}
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
void G4MuPairProductionModel::SampleSecondaries(
std::vector<G4DynamicParticle*>* vdp,
const G4MaterialCutsCouple* couple,
const G4DynamicParticle* aDynamicParticle,
G4double tmin,
G4double tmax)
{
G4double kineticEnergy = aDynamicParticle->GetKineticEnergy();
//G4cout << "------- G4MuPairProductionModel::SampleSecondaries E(MeV)= "
// << kineticEnergy << " "
// << aDynamicParticle->GetDefinition()->GetParticleName() << G4endl;
G4double totalEnergy = kineticEnergy + particleMass;
G4double totalMomentum =
sqrt(kineticEnergy*(kineticEnergy + 2.0*particleMass));
G4ThreeVector partDirection = aDynamicParticle->GetMomentumDirection();
// select randomly one element constituing the material
const G4Element* anElement = SelectRandomAtom(couple,particle,kineticEnergy);
// define interval of energy transfer
G4double maxPairEnergy = MaxSecondaryEnergyForElement(kineticEnergy,
anElement->GetZ());
G4double maxEnergy = std::min(tmax, maxPairEnergy);
G4double minEnergy = std::max(tmin, minPairEnergy);
if(minEnergy >= maxEnergy) { return; }
//G4cout << "emin= " << minEnergy << " emax= " << maxEnergy
// << " minPair= " << minPairEnergy << " maxpair= " << maxPairEnergy
// << " ymin= " << ymin << " dy= " << dy << G4endl;
G4double coeff = G4Log(minPairEnergy/kineticEnergy)/ymin;
// compute limits
G4double yymin = G4Log(minEnergy/kineticEnergy)/coeff;
G4double yymax = G4Log(maxEnergy/kineticEnergy)/coeff;
//G4cout << "yymin= " << yymin << " yymax= " << yymax << G4endl;
// units should not be used, bacause table was built without
G4double logTkin = G4Log(kineticEnergy/MeV);
// sample e-e+ energy, pair energy first
// select sample table via Z
G4int iz1(0), iz2(0);
for(G4int iz=0; iz<nzdat; ++iz) {
if(currentZ == zdat[iz]) {
iz1 = iz2 = currentZ;
break;
} else if(currentZ < zdat[iz]) {
iz2 = zdat[iz];
if(iz > 0) { iz1 = zdat[iz-1]; }
else { iz1 = iz2; }
break;
}
}
if(0 == iz1) { iz1 = iz2 = zdat[nzdat-1]; }
G4double PairEnergy = 0.0;
G4int count = 0;
//G4cout << "start loop Z1= " << iz1 << " Z2= " << iz2 << G4endl;
do {
++count;
// sampling using only one random number
G4double rand = G4UniformRand();
G4double x = FindScaledEnergy(iz1, rand, logTkin, yymin, yymax);
if(iz1 != iz2) {
G4double x2 = FindScaledEnergy(iz2, rand, logTkin, yymin, yymax);
G4double lz1= nist->GetLOGZ(iz1);
G4double lz2= nist->GetLOGZ(iz2);
//G4cout << count << ". x= " << x << " x2= " << x2
// << " Z1= " << iz1 << " Z2= " << iz2 << G4endl;
x += (x2 - x)*(lnZ - lz1)/(lz2 - lz1);
}
//G4cout << "x= " << x << " coeff= " << coeff << G4endl;
PairEnergy = kineticEnergy*G4Exp(x*coeff);
} while((PairEnergy < minEnergy || PairEnergy > maxEnergy) && 10 > count);
//G4cout << "## PairEnergy(GeV)= " << PairEnergy/GeV
// << " Etot(GeV)= " << totalEnergy/GeV << G4endl;
// sample r=(E+-E-)/PairEnergy ( uniformly .....)
G4double rmax =
(1.-6.*particleMass*particleMass/(totalEnergy*(totalEnergy-PairEnergy)))
*sqrt(1.-minPairEnergy/PairEnergy);
G4double r = rmax * (-1.+2.*G4UniformRand()) ;
// compute energies from PairEnergy,r
G4double ElectronEnergy = (1.-r)*PairEnergy*0.5;
G4double PositronEnergy = PairEnergy - ElectronEnergy;
// The angle of the emitted virtual photon is sampled
// according to the muon bremsstrahlung model
G4double gam = totalEnergy/particleMass;
G4double gmax = gam*std::min(1.0, totalEnergy/PairEnergy - 1.0);
G4double gmax2= gmax*gmax;
G4double x = G4UniformRand()*gmax2/(1.0 + gmax2);
G4double theta = sqrt(x/(1.0 - x))/gam;
G4double sint = sin(theta);
G4double phi = twopi * G4UniformRand() ;
G4double dirx = sint*cos(phi), diry = sint*sin(phi), dirz = cos(theta) ;
G4ThreeVector gDirection(dirx, diry, dirz);
gDirection.rotateUz(partDirection);
// the angles of e- and e+ assumed to be the same as virtual gamma
// create G4DynamicParticle object for the particle1
G4DynamicParticle* aParticle1 =
new G4DynamicParticle(theElectron, gDirection,
ElectronEnergy - electron_mass_c2);
// create G4DynamicParticle object for the particle2
G4DynamicParticle* aParticle2 =
new G4DynamicParticle(thePositron, gDirection,
PositronEnergy - electron_mass_c2);
// primary change
kineticEnergy -= (ElectronEnergy + PositronEnergy);
fParticleChange->SetProposedKineticEnergy(kineticEnergy);
partDirection *= totalMomentum;
partDirection -= (aParticle1->GetMomentum() + aParticle2->GetMomentum());
partDirection = partDirection.unit();
fParticleChange->SetProposedMomentumDirection(partDirection);
// add secondary
vdp->push_back(aParticle1);
vdp->push_back(aParticle2);
//G4cout << "-- G4MuPairProductionModel::SampleSecondaries done" << G4endl;
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
void G4MuPairProductionModel::DataCorrupted(G4int Z, G4double logTkin)
{
G4ExceptionDescription ed;
ed << "G4ElementData is not properly initialized Z= " << Z
<< " Ekin(MeV)= " << G4Exp(logTkin)
<< " IsMasterThread= " << IsMaster()
<< " Model " << GetName();
G4Exception("G4MuPairProductionModel::()","em0033",FatalException,
ed,"");
}
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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