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geant4/source/processes/hadronic/cross_sections/include/G4ElectroNuclearCrossSection.hh
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Gabriele Cosmo 921d3b1cda Import Geant4 4.0.0 source tree
2016-06-08 16:18:25 +02:00

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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 *
// * authors in 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: G4ElectroNuclearCrossSection.hh,v 1.6 2001/11/30 14:58:04 stesting Exp $
// GEANT4 tag $Name: geant4-04-00 $
//
//
// GEANT4 physics class: G4ElectroNuclearCrossSection -- header file
// M.V. Kossov, ITEP(Moscow), 24-OCT-01
//
#ifndef G4ElectroNuclearCrossSection_h
#define G4ElectroNuclearCrossSection_h 1
#include "G4VCrossSectionDataSet.hh"
#include "G4DynamicParticle.hh"
#include "G4Element.hh"
#include "G4ParticleTable.hh"
#include "G4NucleiProperties.hh"
#include "G4NucleiPropertiesTable.hh"
#include "g4std/vector"
#include "Randomize.hh"
#include "G4Electron.hh"
#include "G4Positron.hh"
class G4ElectroNuclearCrossSection : public G4VCrossSectionDataSet
{
public:
G4ElectroNuclearCrossSection() // Constructor @@??
{
//theHadronCrossSections = G4HadronCrossSections::Instance();
}
~G4ElectroNuclearCrossSection() {}
G4bool IsApplicable(const G4DynamicParticle* aParticle, const G4Element* anElement)
{
//return theHadronCrossSections->IsApplicable(aParticle, anElement);
// Possible prototype
G4bool result = false;
if( aParticle->GetDefinition()==G4Electron::ElectronDefinition()) result = true;
if( aParticle->GetDefinition()==G4Positron::PositronDefinition()) result = true;
return result;
}
G4double GetCrossSection(const G4DynamicParticle* aParticle, const G4Element* anElement,
G4double temperature=0.);
G4double GetEffectivePhotonEnergy();
void BuildPhysicsTable(const G4ParticleDefinition&) {}
void DumpPhysicsTable(const G4ParticleDefinition&) {}
private:
G4int GetFunctions(G4double a, G4double* y, G4double* z);
G4double LinearFit(G4double X, G4int N, const G4double* XN, const G4double* YN);
G4double ThresholdEnergy(G4int Z, G4int N);
G4double HighEnergyPhi(G4double lE);
G4double HighEnergyFun(G4double lE);
G4double SolveTheEquation(G4double f);
G4double Fun(G4double x);
G4double DFun(G4double x);
// Body
private:
static G4int lastF; // Last used in the cross section TheFirstBin
static G4double* lastPhi; // Pointer to the last array of the Phi function
static G4double* lastFun; // Pointer to the last array of the Fun function
static G4int lastL; // Last used in the cross section TheLastBin
static G4double lastLE; // Last used in the cross section TheLogE
static G4double lastSig; // Last value of the Cross Section
static G4double lastH; // Last value of the High energy A-dependence
};
// Gives the threshold energy for different nuclei (min of p- and n-threshold)
inline G4double G4ElectroNuclearCrossSection::ThresholdEnergy(G4int Z, G4int N)
{
// CHIPS - Direct GEANT
//static const G4double mNeut = G4QPDGCode(2112).GetMass();
//static const G4double mProt = G4QPDGCode(2212).GetMass();
static const G4double mNeut = G4NucleiProperties::GetNuclearMass(1,0);
static const G4double mProt = G4NucleiProperties::GetNuclearMass(1,1);
// ---------
static const G4double infEn = 9.e27;
G4int A=Z+N;
if(A<1) return infEn;
else if(A==1) return 134.9766; // Pi0 threshold for the nucleon
// CHIPS - Direct GEANT
//G4double mT= G4QPDGCode(111).GetNuclMass(Z,N,0);
G4double mT= 0.;
if(G4NucleiPropertiesTable::IsInTable(Z,A)) mT=G4NucleiProperties::GetNuclearMass(A,Z);
else return 0.; // If it is not in the Table of Stable Nuclei, then the Threshold=0
// ---------
G4double mP= infEn;
//if(Z) mP= G4QPDGCode(111).GetNuclMass(Z-1,N,0);
if(Z&&G4NucleiPropertiesTable::IsInTable(Z-1,A-1)) mP=G4NucleiProperties::GetNuclearMass(A-1,Z-1);
else return infEn;
G4double mN= infEn;
//if(N) mN= G4QPDGCode(111).GetNuclMass(Z,N-1,0);
if(N&&G4NucleiPropertiesTable::IsInTable(Z,A-1)) mN=G4NucleiProperties::GetNuclearMass(A-1,Z);
else return infEn;
G4double dP= mP+mProt-mT;
G4double dN= mN+mNeut-mT;
if(dP<dN)dN=dP;
return dN;
}
inline G4double G4ElectroNuclearCrossSection::DFun(G4double x)
{
static const G4double f21=.75;
static const G4double f22=.78;
static const G4double f23=.9;
G4double f2=1.;
if (lastH<.005) f2=f21;
else if(lastH<0.01) f2=f22;
else if(lastH<0.07) f2=f23;
return (lastLE-x)*(0.0116*exp(0.16*x)+f2*exp(-0.26*x));
}
inline G4double G4ElectroNuclearCrossSection::Fun(G4double x)
{return (lastLE*HighEnergyPhi(x)-HighEnergyFun(x));}
inline G4double G4ElectroNuclearCrossSection::HighEnergyPhi(G4double lEn)
{
static const G4double le=log(2000.);
static const G4double c1=0.16;
static const G4double f1=.0116/c1;
static const G4double e1=exp(c1*le);
static const G4double c2=-0.26;
static const G4double f21=.75/c2;
static const G4double f22=.78/c2;
static const G4double f23=.9/c2;
static const G4double f24=1./c2;
static const G4double e2=exp(c2*le);
G4double f2=f24;
if (lastH<.005) f2=f21;
else if(lastH<0.01) f2=f22;
else if(lastH<0.07) f2=f23;
return f1*(exp(c1*lEn)-e1)+f2*(exp(c2*lEn)-e2);
}
inline G4double G4ElectroNuclearCrossSection::HighEnergyFun(G4double lEn)
{
static const G4double le=log(2000.);
static const G4double c1=0.16;
static const G4double f1=.0116/c1/c1;
static const G4double e1=(c1*le-1.)*exp(c1*le);
static const G4double c2=-0.26;
static const G4double f21=.75/c2/c2;
static const G4double f22=.78/c2/c2;
static const G4double f23=.9/c2/c2;
static const G4double f24=1./c2/c2;
static const G4double e2=(c2*le-1.)*exp(c2*le);
G4double f2=f24;
if (lastH<.005) f2=f21;
else if(lastH<0.01) f2=f22;
else if(lastH<0.07) f2=f23;
G4double h1=c1*lEn;
G4double h2=c2*lEn;
return f1*((h1-1.)*exp(h1)-e1)+f2*((h2-1.)*exp(h2)-e2);
}
#endif
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