G4LowEPComptonModel.hh

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// |                                                                   |
// |             G4LowEPComptonModel-- Geant4 Monash University        |
// |                   low energy Compton scattering model.            |
// |             J. M. C. Brown, Monash University, Australia          |
// |                    ## Unpolarised photons only ##                 |
// |                                                                   |
// |                                                                   |
// *********************************************************************
// |                                                                   |
// | The following is a Geant4 class to simulate the process of        |
// | bound electron Compton scattering. General code structure is      |
// | based on G4LowEnergyCompton.cc and G4LivermoreComptonModel.cc.    |
// | Algorithms for photon energy, and ejected Compton electron        |
// | direction taken from:                                             |
// |                                                                   |
// | J. M. C. Brown, M. R. Dimmock, J. E. Gillam and D. M. Paganin,    |
// | "A low energy bound atomic electron Compton scattering model      |
// |  for Geant4", NIMB, Vol. 338, 77-88, 2014.                        |
// |                                                                   |
// | The author acknowledges the work of the Geant4 collaboration      |
// | in developing the following algorithms that have been employed    |
// | or adapeted for the present software:                             |    
// |                                                                   |
// |  # sampling of photon scattering angle,                           |
// |  # target element selection in composite materials,               |
// |  # target shell selection in element,                             |
// |  # and sampling of bound electron momentum from Compton profiles. |
// |                                                                   |
// *********************************************************************
// |                                                                   |
// | History:                                                          |
// | --------                                                          |
// |                                                                   |
// | Nov. 2011 JMCB       - First version                              |
// | Feb. 2012 JMCB       - Migration to Geant4 9.5                    |
// | Sep. 2012 JMCB       - Final fixes for Geant4 9.6                 |
// | Feb. 2013 JMCB       - Geant4 9.6 FPE fix for bug 1426            |
// | Jan. 2015 JMCB       - Migration to MT (Based on Livermore        |
// |                        implementation)                            |
// | Feb. 2016 JMCB       - Geant4 10.2 FPE fix for bug 1676           |
// |                                                                   |
// *********************************************************************
 
#ifndef G4LowEPComptonModel_h
#define G4LowEPComptonModel_h 1
 
#include "G4VEmModel.hh"
#include "G4PhysicsFreeVector.hh"
 
class G4ParticleChangeForGamma;
class G4VAtomDeexcitation;
class G4ShellData;
class G4DopplerProfile;
 
class G4LowEPComptonModel : public G4VEmModel
{
 
public:
 
  explicit G4LowEPComptonModel(const G4ParticleDefinition* p = nullptr, 
                  const G4String& nam = "LowEPComptonModel");
    virtual ~G4LowEPComptonModel();
 
  void Initialise(const G4ParticleDefinition*, const G4DataVector&) override;
  void InitialiseLocal(const G4ParticleDefinition*,
                               G4VEmModel* masterModel) override;
 
  void InitialiseForElement(const G4ParticleDefinition*, G4int Z) override;
 
  G4double ComputeCrossSectionPerAtom( const G4ParticleDefinition*,
                       G4double kinEnergy,
                       G4double Z,
                       G4double A=0,
                       G4double cut=0,
                       G4double emax=DBL_MAX ) override;
 
  void SampleSecondaries(std::vector<G4DynamicParticle*>*,
             const G4MaterialCutsCouple*,
             const G4DynamicParticle*,
             G4double tmin,
             G4double maxEnergy) override;
 
  G4LowEPComptonModel & operator=(const  G4LowEPComptonModel &right) = delete;
  G4LowEPComptonModel(const  G4LowEPComptonModel&) = delete;
 
private:
  void ReadData(size_t Z, const char* path = 0);
  G4double ComputeScatteringFunction(G4double x, G4int Z);
 
  G4ParticleChangeForGamma* fParticleChange;
  G4VAtomDeexcitation*      fAtomDeexcitation;
  static G4ShellData*       shellData;
  static G4DopplerProfile*  profileData;
 
  static const G4int maxZ = 99;
  static G4PhysicsFreeVector* data[100];
  static const G4double ScatFuncFitParam[101][9];
 
  G4int verboseLevel;
  G4bool isInitialised;
};
 
//****************************************************************************
 
#endif