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This commit is contained in:
Gabriele Cosmo
2016-06-10 12:08:39 +02:00
parent 286caacf06
commit c9b32a6c0a
5770 changed files with 1050949 additions and 367105 deletions
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source/processes/electromagnetic/standard/src/G4DeltaAngle.cc
+86 -45
View File
@@ -53,6 +53,7 @@
#include "G4ParticleDefinition.hh"
#include "G4Electron.hh"
#include "G4AtomicShells.hh"
#include "G4SystemOfUnits.hh"
#include "G4Log.hh"
using namespace std;
@@ -63,45 +64,64 @@ G4DeltaAngle::G4DeltaAngle(const G4String&)
fElectron = G4Electron::Electron();
nprob = 26;
prob.resize(nprob,0.0);
fShellIdx = -1;
}
G4DeltaAngle::~G4DeltaAngle()
{}
G4ThreeVector&
G4DeltaAngle::SampleDirectionForShell(const G4DynamicParticle* dp,
G4double kinEnergyFinal, G4int Z, G4int idx,
const G4Material* mat)
{
fShellIdx = idx;
return SampleDirection(dp, kinEnergyFinal,Z, mat);
}
G4ThreeVector&
G4DeltaAngle::SampleDirection(const G4DynamicParticle* dp,
G4double kinEnergyFinal, G4int Z,
const G4Material*)
{
G4int nShells = G4AtomicShells::GetNumberOfShells(Z);
if(nShells> nprob) {
nprob = nShells;
prob.resize(nprob,0.0);
}
G4int idx;
G4double sum = 0.0;
for(idx=0; idx<nShells; ++idx) {
sum += G4AtomicShells::GetNumberOfElectrons(Z, idx)
/G4AtomicShells::GetBindingEnergy(Z, idx);
prob[idx] = sum;
}
sum *= G4UniformRand();
for(idx=0; idx<nShells; ++idx) {
if(sum <= prob[idx]) { break; }
G4int idx = fShellIdx;
// if idx is not properly defined sample shell index
if(idx < 0 || idx >= nShells) {
if(nShells> nprob) {
nprob = nShells;
prob.resize(nprob,0.0);
}
G4double sum = 0.0;
for(idx=0; idx<nShells; ++idx) {
sum += G4AtomicShells::GetNumberOfElectrons(Z, idx)
/G4AtomicShells::GetBindingEnergy(Z, idx);
prob[idx] = sum;
}
sum *= G4UniformRand();
for(idx=0; idx<nShells; ++idx) {
if(sum <= prob[idx]) { break; }
}
}
G4double bindingEnergy = G4AtomicShells::GetBindingEnergy(Z, idx);
G4double mass = dp->GetParticleDefinition()->GetPDGMass();
G4ThreeVector bst(0.0,0.0,0.0);
G4double cost, en, mom;
G4double cost;
/*
G4cout << "E(keV)= " << kinEnergyFinal/keV
<< " Ebind(keV)= " << bindingEnergy
<< " idx= " << idx << " nShells= " << nShells << G4endl;
*/
G4int n = 0;
G4bool isOK = false;
static const G4int nmax = 100;
do {
++n;
// the atomic electron
G4double x = -G4Log(G4UniformRand());
G4double eKinEnergy = bindingEnergy*x;
G4double ePotEnergy = bindingEnergy*(1.0 + x);
G4double e = kinEnergyFinal + ePotEnergy + electron_mass_c2;
G4double p = sqrt((e + electron_mass_c2)*(e - electron_mass_c2));
G4double totEnergy = dp->GetTotalEnergy();
G4double totMomentum = dp->GetTotalMomentum();
@@ -111,41 +131,62 @@ G4DeltaAngle::SampleDirection(const G4DynamicParticle* dp,
*(totEnergy - electron_mass_c2));
}
G4double eTotMomentum = sqrt(eKinEnergy*(eKinEnergy + 2*electron_mass_c2));
G4double phi = G4UniformRand()*twopi;
G4double eTotEnergy = eKinEnergy + electron_mass_c2;
G4double eTotMomentum = sqrt(eKinEnergy*(eTotEnergy + electron_mass_c2));
G4double costet = 2*G4UniformRand() - 1;
G4double sintet = sqrt((1 - costet)*(1 + costet));
G4LorentzVector lv0(eTotMomentum*sintet*cos(phi),
eTotMomentum*sintet*sin(phi),
eTotMomentum*costet + totMomentum,
eKinEnergy + electron_mass_c2 + totEnergy);
bst = lv0.boostVector();
G4double m0 = lv0.mag();
G4double bet = lv0.beta();
G4double gam = lv0.gamma();
cost = 1.0;
if(n >= nmax) {
/*
G4ExceptionDescription ed;
ed << "### G4DeltaAngle Warning: " << n
<< " iterations - stop the loop with cost= 1.0 "
<< " for " << dp->GetDefinition()->GetParticleName() << "\n"
<< " Ekin(MeV)= " << dp->GetKineticEnergy()/MeV
<< " Efinal(MeV)= " << kinEnergyFinal/MeV
<< " Ebinding(MeV)= " << bindingEnergy/MeV;
G4Exception("G4DeltaAngle::SampleDirection","em0044",
JustWarning, ed,"");
*/
if(0.0 == bindingEnergy) { isOK = true; }
bindingEnergy = 0.0;
}
en = 0.5*(m0*m0 - mass*mass + electron_mass_c2*electron_mass_c2)/m0;
mom = sqrt((en + electron_mass_c2)*(en - electron_mass_c2));
G4double x0 = p*(totMomentum + eTotMomentum*costet);
/*
G4cout << " x0= " << x0 << " p= " << p
<< " ptot= " << totMomentum << " pe= " << eTotMomentum
<< " e= " << e << " totMom= " << totMomentum
<< G4endl;
*/
if(x0 > 0.0) {
G4double x1 = p*eTotMomentum*sintet;
G4double x2 = totEnergy*(eTotEnergy - e) - e*eTotEnergy
- totMomentum*eTotMomentum*costet + electron_mass_c2*electron_mass_c2;
G4double y = -x2/x0;
if(std::fabs(y) <= 1.0) {
cost = -(x2 + x1*sqrt(1. - y*y))/x0;
if(std::fabs(cost) <= 1.0) { isOK = true; }
else { cost = 1.0; }
}
cost= (e/gam - en)/(mom*bet);
/*
G4cout << " Ekin(MeV)= " << dp->GetKineticEnergy()
<< " e1(keV)= " << eKinEnergy/keV
<< " e2(keV)= " << (e - electron_mass_c2)/keV
<< " 1-cost= " << 1-cost
<< " x0= " << x0 << " x1= " << x1 << " x2= " << x2
<< G4endl;
*/
}
//G4cout << "e= " << e << " gam= " << gam << " en= " << en
// << " mom= " << mom << " beta= " << bet << " cost= " << cost
// << G4endl;
} while(std::fabs(cost) > 1.0);
} while(!isOK);
G4double sint = sqrt((1 - cost)*(1 + cost));
G4double phi = twopi*G4UniformRand();
G4LorentzVector lv1(sint*std::cos(phi)*mom, sint*std::sin(phi)*mom,
mom*cost, en);
lv1.boost(bst);
fLocalDirection.set(lv1.x(), lv1.y(), lv1.z());
fLocalDirection = fLocalDirection.unit();
fLocalDirection.set(sint*cos(phi), sint*sin(phi), cost);
fLocalDirection.rotateUz(dp->GetMomentumDirection());
return fLocalDirection;