Gabriele Cosmo
118 lines
4.1 KiB
C++
118 lines
4.1 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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//
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// GEANT4 physics class: G4ElectroNuclearCrossSection -- header file
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// M.V. Kossov, ITEP(Moscow), 24-OCT-01
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// The last update: M.V. Kossov, CERN/ITEP (Moscow) 25-Sept-03
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// A. Dotti 2-May-2013: Re-write caching logic and optimizations
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#ifndef G4ElectroNuclearCrossSection_h
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#define G4ElectroNuclearCrossSection_h 1
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#include "G4VCrossSectionDataSet.hh"
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#include "G4DynamicParticle.hh"
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#include "G4Element.hh"
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#include "G4ParticleTable.hh"
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#include "G4NucleiProperties.hh"
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#include "G4NistManager.hh"
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#include <vector>
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#include "Randomize.hh"
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#include "G4Electron.hh"
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#include "G4Positron.hh"
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#include <map>
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//A cache element
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struct cacheEl_t {
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G4int F;
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G4double* J1;
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G4double* J2;
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G4double* J3;
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G4double H;
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G4double TH;
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};
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class G4ElectroNuclearCrossSection : public G4VCrossSectionDataSet
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{
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public:
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G4ElectroNuclearCrossSection();
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~G4ElectroNuclearCrossSection() override;
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static const char* Default_Name() {return "ElectroNuclearXS";}
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void CrossSectionDescription(std::ostream&) const override;
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G4bool IsElementApplicable(const G4DynamicParticle*, G4int Z,
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const G4Material*) override;
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G4double GetElementCrossSection(const G4DynamicParticle*, G4int Z,
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const G4Material* mat) override;
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G4double GetEquivalentPhotonEnergy();
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G4double GetVirtualFactor(G4double nu, G4double Q2);
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G4double GetEquivalentPhotonQ2(G4double nu);
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G4ElectroNuclearCrossSection& operator=
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(const G4ElectroNuclearCrossSection &right) = delete;
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G4ElectroNuclearCrossSection(const G4ElectroNuclearCrossSection&) = delete;
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private:
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G4int GetFunctions(G4double a, G4double* x, G4double* y, G4double* z);
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G4double ThresholdEnergy(G4int Z, G4int N);
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G4double SolveTheEquation(G4double f);
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G4double Fun(G4double x);
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G4double DFun(G4double x);
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G4double HighEnergyJ1(G4double lE);
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G4double HighEnergyJ2(G4double lE, G4double E);
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G4double HighEnergyJ3(G4double lE, G4double E2);
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// Body
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private:
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G4int currentN;
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G4int currentZ;
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//Cache structure
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G4int lastZ;
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std::vector<cacheEl_t*> cache;
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cacheEl_t* lastUsedCacheEl;
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G4NistManager* nistmngr;
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//Cache values for XS
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G4double lastE ; //Last used energy value
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G4double lastSig; //Last used XS value
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G4double lastG; //Last value of gamma=lnE-ln(me)
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G4int lastL; //Last used in the cross section TheLastBin
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const G4double mNeut;
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const G4double mProt;
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};
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#endif
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