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This commit is contained in:
Gabriele Cosmo
2016-06-09 10:41:53 +02:00
parent 4aea781e80
commit 96686e0c8f
6560 changed files with 153347 additions and 238155 deletions
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source/processes/cuts/src/G4RToEConvForGamma.cc
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//
// ********************************************************************
// * DISCLAIMER *
// * *
// * The following disclaimer summarizes all the specific disclaimers *
// * of contributors to this software. The specific disclaimers,which *
// * govern, are listed with their locations in: *
// * http://cern.ch/geant4/license *
// * *
// * 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. *
// * *
// * This code implementation is the intellectual property of the *
// * GEANT4 collaboration. *
// * By copying, distributing or modifying the Program (or any work *
// * based on the Program) you indicate your acceptance of this *
// * statement, and all its terms. *
// ********************************************************************
//
//
// $Id: G4RToEConvForGamma.cc,v 1.1 2003/09/19 14:47:01 gcosmo Exp $
// GEANT4 tag $Name: geant4-06-00 $
//
//
// --------------------------------------------------------------
// GEANT 4 class implementation file/ History:
// 5 Oct. 2002, H.Kuirashige : Structure created based on object model
// --------------------------------------------------------------
#include "G4RToEConvForGamma.hh"
#include "G4ParticleDefinition.hh"
#include "G4ParticleTable.hh"
#include "G4Material.hh"
#include "G4PhysicsLogVector.hh"
#include "G4ios.hh"
#include <iomanip>
#include <strstream>
G4RToEConvForGamma::G4RToEConvForGamma() : G4VRangeToEnergyConverter()
{
theParticle = G4ParticleTable::GetParticleTable()->FindParticle("gamma");
if (theParticle ==0) {
#ifdef G4VERBOSE
if (GetVerboseLevel()>0) {
G4cout << " G4RToEConvForGamma::G4RToEConvForGamma() ";
G4cout << " Gamma is not defined !!" << G4endl;
}
#endif
}
TotBin = 100;
}
G4RToEConvForGamma::~G4RToEConvForGamma()
{
}
// ***********************************************************************
// ******************* BuildAbsorptionLengthVector ***********************
// ***********************************************************************
void G4RToEConvForGamma::BuildAbsorptionLengthVector(
const G4Material* aMaterial,
G4double ,
G4double ,
G4RangeVector* absorptionLengthVector )
{
// fill the absorption length vector for this material
// absorption length is defined here as
//
// absorption length = 5./ macroscopic absorption cross section
//
const G4CrossSectionTable* aCrossSectionTable = (G4CrossSectionTable*)(theLossTable);
const G4ElementVector* elementVector = aMaterial->GetElementVector();
const G4double* atomicNumDensityVector = aMaterial->GetAtomicNumDensityVector();
// fill absorption length vector
G4int NumEl = aMaterial->GetNumberOfElements();
G4double absorptionLengthMax = 0.0;
for (size_t ibin=0; ibin<size_t(TotBin); ibin++) {
G4double lowEdgeEnergy = absorptionLengthVector->GetLowEdgeEnergy(ibin);
G4double SIGMA = 0. ;
for (size_t iel=0; iel<size_t(NumEl); iel++) {
G4bool isOut;
G4int IndEl = (*elementVector)[iel]->GetIndex();
SIGMA += atomicNumDensityVector[iel]*
(*aCrossSectionTable)[IndEl]->GetValue(lowEdgeEnergy,isOut);
}
// absorption length=5./SIGMA
absorptionLengthVector->PutValue(ibin, 5./SIGMA);
if (absorptionLengthMax < 5./SIGMA ) absorptionLengthMax = 5./SIGMA;
}
}
// ***********************************************************************
// ********************** ComputeCrossSection ****************************
// ***********************************************************************
G4double G4RToEConvForGamma::ComputeCrossSection(G4double AtomicNumber,
G4double KineticEnergy) const
{
// Compute the "absorption" cross section of the photon "absorption"
// cross section means here the sum of the cross sections of the
// pair production, Compton scattering and photoelectric processes
static G4double Z;
const G4double t1keV = 1.*keV;
const G4double t200keV = 200.*keV;
const G4double t100MeV = 100.*MeV;
static G4double s200keV, s1keV;
static G4double tmin, tlow;
static G4double smin, slow;
static G4double cmin, clow, chigh;
// compute Z dependent quantities in the case of a new AtomicNumber
if(abs(AtomicNumber-Z)>0.1) {
Z = AtomicNumber;
G4double Zsquare = Z*Z;
G4double Zlog = log(Z);
G4double Zlogsquare = Zlog*Zlog;
s200keV = (0.2651-0.1501*Zlog+0.02283*Zlogsquare)*Zsquare;
tmin = (0.552+218.5/Z+557.17/Zsquare)*MeV;
smin = (0.01239+0.005585*Zlog-0.000923*Zlogsquare)*exp(1.5*Zlog);
cmin=log(s200keV/smin)/(log(tmin/t200keV)*log(tmin/t200keV));
tlow = 0.2*exp(-7.355/sqrt(Z))*MeV;
slow = s200keV*exp(0.042*Z*log(t200keV/tlow)*log(t200keV/tlow));
s1keV = 300.*Zsquare;
clow =log(s1keV/slow)/log(tlow/t1keV);
chigh=(7.55e-5-0.0542e-5*Z)*Zsquare*Z/log(t100MeV/tmin);
}
// calculate the cross section (using an approximate empirical formula)
G4double s;
if ( KineticEnergy<tlow ) {
if(KineticEnergy<t1keV) s = slow*exp(clow*log(tlow/t1keV));
else s = slow*exp(clow*log(tlow/KineticEnergy));
} else if ( KineticEnergy<t200keV ) {
s = s200keV
* exp(0.042*Z*log(t200keV/KineticEnergy)*log(t200keV/KineticEnergy));
} else if( KineticEnergy<tmin ){
s = smin
* exp(cmin*log(tmin/KineticEnergy)*log(tmin/KineticEnergy));
} else {
s = smin + chigh*log(KineticEnergy/tmin);
}
return s * barn;
}