Import Geant4 0.0.0 source tree
This commit is contained in:
Gabriele Cosmo
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// This code implementation is the intellectual property of
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// the RD44 GEANT4 collaboration.
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//
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// By copying, distributing or modifying the Program (or any work
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// based on the Program) you indicate your acceptance of this statement,
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// and all its terms.
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//
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// $Id: G4Gamma.cc,v 2.4 1998/09/24 05:42:30 kurasige Exp $
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// GEANT4 tag $Name: geant4-00 $
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//
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//
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// ----------------------------------------------------------------------
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// GEANT 4 class implementation file
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//
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// For information related to this code contact:
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// CERN, CN Division, ASD Group
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// History: first implementation, based on object model of
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// 4th April 1996, G.Cosmo
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// **********************************************************************
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// Added particle definitions, H.Kurashige, 19 April 1996
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// Added SetCuts implementation , L.Urban , 12 June 1996
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// Code uses operators (+=, *=, ++, -> etc.) correctly, P. Urban, 26/6/96
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// Add GammaDefinition(), H.Kurashige, 4 July 1996
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// ----------------------------------------------------------------------
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#include "G4ios.hh"
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#include <fstream.h>
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#include <iomanip.h>
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#include "G4Gamma.hh"
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// ######################################################################
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// ### GAMMA ###
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// ######################################################################
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G4Gamma::G4Gamma(
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const G4String& aName, G4double mass,
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G4double width, G4double charge,
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G4int iSpin, G4int iParity,
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G4int iConjugation, G4int iIsospin,
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G4int iIsospin3, G4int gParity,
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const G4String& pType, G4int lepton,
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G4int baryon, G4int encoding,
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G4bool stable, G4double lifetime,
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G4DecayTable *decaytable )
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: G4VBoson( aName,mass,width,charge,iSpin,iParity,
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iConjugation,iIsospin,iIsospin3,gParity,pType,
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lepton,baryon,encoding,stable,lifetime,decaytable )
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//-- members initialisation for SetCuts ------------------------------
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{
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const G4double DefaultLowestEnergy = 1.0*keV;
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const G4double DefaultHighestEnergy = 1.0*GeV;
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const G4int DefaultTotBin = 100;
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//-- members initialisation for SetCuts ------------------------------
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LowestEnergy = DefaultLowestEnergy;
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HighestEnergy = DefaultHighestEnergy;
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TotBin = DefaultTotBin;
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// Anti-particle of gamma is gamma itself
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SetAntiPDGEncoding(encoding);
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}
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// ......................................................................
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// ... static member definitions ...
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// ......................................................................
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//
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// Arguments for constructor are as follows
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// name mass width charge
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// 2*spin parity C-conjugation
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// 2*Isospin 2*Isospin3 G-parity
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// type lepton number baryon number PDG encoding
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// stable lifetime decay table
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G4Gamma G4Gamma::theGamma(
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"gamma", 0.0*MeV, 0.0*MeV, 0.0,
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2, -1, -1,
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0, 0, 0,
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"gamma", 0, 0, 22,
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true, 0.0, NULL
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);
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G4Gamma* G4Gamma::GammaDefinition() {return &theGamma;}
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// initialization for static cut values
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G4double G4Gamma::theGammaLengthCut = -1.0;
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G4double* G4Gamma::theGammaKineticEnergyCuts = NULL;
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// ***********************************************************************
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// ******************* BuildAbsorptionLengthVector ***********************
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// ***********************************************************************
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void G4Gamma::BuildAbsorptionLengthVector(
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const G4Material* aMaterial,
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const G4CrossSectionTable* aCrossSectionTable,
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G4double ,
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G4double ,
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G4RangeVector* absorptionLengthVector )
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{
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// fill the absorption length vector for this material
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// absorption length is defined here as
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//
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// absorption length = 5./ macroscopic absorption cross section
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//
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const G4ElementVector* elementVector = aMaterial->GetElementVector();
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const G4double* atomicNumDensityVector = aMaterial->GetAtomicNumDensityVector();
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// fill absorption length vector
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if (absorptionLengthVector == NULL) {
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G4String aErrorMessage("Error in G4Gamma::BuildAbsorptionLengthVector()");
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aErrorMessage += " NULL pointer is found in absorptionLengthVector \n";
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G4Exception((const char*)aErrorMessage);
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}
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G4int NumEl = aMaterial->GetNumberOfElements();
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G4double absorptionLengthMax = 0.0;
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for (G4int ibin=0; ibin<TotBin; ibin++)
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{
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G4double lowEdgeEnergy = absorptionLengthVector->GetLowEdgeEnergy(ibin);
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G4double SIGMA = 0. ;
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for (G4int iel=0; iel<NumEl; iel++)
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{
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G4bool isOut;
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G4int IndEl = (*elementVector)(iel)->GetIndex();
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SIGMA += atomicNumDensityVector[iel]*
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(*aCrossSectionTable)[IndEl]->GetValue(lowEdgeEnergy,isOut);
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}
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// absorption length=5./SIGMA
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absorptionLengthVector->PutValue(ibin, 5./SIGMA);
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if (absorptionLengthMax < 5./SIGMA ) absorptionLengthMax = 5./SIGMA;
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}
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if ( theCutInMaxInteractionLength >= absorptionLengthMax ) {
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G4cout << "******** SetCuts for " << GetParticleName();
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G4cout << " ********************" << endl;
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G4cout << "The maximal meaningful cut is ";
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G4cout << absorptionLengthMax/mm << " mm." << endl;
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G4cout << "All the " << GetParticleName() << "will be killed !" << endl;
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G4cout << "in the material " << aMaterial->GetName() << "." << endl;
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}
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}
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// ***********************************************************************
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// ********************** ComputeCrossSection ****************************
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// ***********************************************************************
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G4double G4Gamma::ComputeCrossSection(G4double AtomicNumber,
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G4double KineticEnergy) const
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{
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// Compute the "absorption" cross section of the photon "absorption"
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// cross section means here the sum of the cross sections of the
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// pair production, Compton scattering and photoelectric processes
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static G4double Z;
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const G4double t1keV = 1.*keV;
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const G4double t200keV = 200.*keV;
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const G4double t100MeV = 100.*MeV;
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static G4double s200keV, s1keV;
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static G4double tmin, tlow;
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static G4double smin, slow;
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static G4double cmin, clow, chigh;
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// compute Z dependent quantities in the case of a new AtomicNumber
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if(abs(AtomicNumber-Z)>0.1)
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{
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Z = AtomicNumber;
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G4double Zsquare = Z*Z;
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G4double Zlog = log(Z);
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G4double Zlogsquare = Zlog*Zlog;
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s200keV = (0.2651-0.1501*Zlog+0.02283*Zlogsquare)*Zsquare;
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tmin = (0.552+218.5/Z+557.17/Zsquare)*MeV;
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smin = (0.01239+0.005585*Zlog-0.000923*Zlogsquare)*exp(1.5*Zlog);
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cmin=log(s200keV/smin)/(log(tmin/t200keV)*log(tmin/t200keV));
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tlow = 0.2*exp(-7.355/sqrt(Z))*MeV;
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slow = s200keV*exp(0.042*Z*log(t200keV/tlow)*log(t200keV/tlow));
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s1keV = 300.*Zsquare;
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clow =log(s1keV/slow)/log(tlow/t1keV);
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chigh=(7.55e-5-0.0542e-5*Z)*Zsquare*Z/log(t100MeV/tmin);
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}
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// calculate the cross section (using an approximate empirical formula)
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G4double s;
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if ( KineticEnergy<tlow ) {
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if(KineticEnergy<t1keV) s = slow*exp(clow*log(tlow/t1keV));
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else s = slow*exp(clow*log(tlow/KineticEnergy));
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} else if ( KineticEnergy<t200keV ) {
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s = s200keV
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* exp(0.042*Z*log(t200keV/KineticEnergy)*log(t200keV/KineticEnergy));
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} else if( KineticEnergy<tmin ){
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s = smin
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* exp(cmin*log(tmin/KineticEnergy)*log(tmin/KineticEnergy));
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} else {
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s = smin + chigh*log(KineticEnergy/tmin);
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}
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return s * barn;
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}
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// **********************************************************************
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// ******************** ConvertCutToKineticEnergy ***********************
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// **********************************************************************
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G4double G4Gamma::ConvertCutToKineticEnergy(
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G4RangeVector* absorptionLengthVector) const
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{
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const G4double epsilon=0.01;
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const G4int NBIN=200;
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// find max. absorption length and the corresponding energy (rmax,Tmax)
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G4double fac=log(HighestEnergy/LowestEnergy)/NBIN;
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fac=exp(fac);
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G4double T=LowestEnergy/fac;
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G4double Tmax = T;
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G4double rmax = -1.e10*mm;
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G4bool isOut;
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for (G4int ibin=0; ibin<NBIN; ibin++)
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{
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T=fac*T;
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G4double r=absorptionLengthVector->GetValue(T,isOut);
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if ( r>rmax )
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{
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Tmax=T;
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rmax=r;
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}
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}
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G4double T1 = LowestEnergy;
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G4double r1 = absorptionLengthVector->GetValue(T1,isOut);
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if ( theCutInMaxInteractionLength <= r1 ) {
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return T1;
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} else if ( theCutInMaxInteractionLength >= rmax ) {
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G4cout << "******** ConvertCutToKineticEnergy for " << GetParticleName();
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G4cout << " ********************" << endl;
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G4cout << "The cut energy is set " << DBL_MAX/GeV << "GeV " <<endl;
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return DBL_MAX;
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} else {
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G4double T2 = Tmax;
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G4double T3 = sqrt(T1*T2);
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G4double r3 = absorptionLengthVector->GetValue(T3,isOut);
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while ( abs(1.-r3/theCutInMaxInteractionLength)>epsilon ) {
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if ( theCutInMaxInteractionLength <= r3 )
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T2 = T3;
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else
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T1 = T3;
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T3 = sqrt(T1*T2);
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r3 = absorptionLengthVector->GetValue(T3,isOut);
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}
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return T3;
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}
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}
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