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0001 //
0002 // ********************************************************************
0003 // * License and Disclaimer                                           *
0004 // *                                                                  *
0005 // * The  Geant4 software  is  copyright of the Copyright Holders  of *
0006 // * the Geant4 Collaboration.  It is provided  under  the terms  and *
0007 // * conditions of the Geant4 Software License,  included in the file *
0008 // * LICENSE and available at  http://cern.ch/geant4/license .  These *
0009 // * include a list of copyright holders.                             *
0010 // *                                                                  *
0011 // * Neither the authors of this software system, nor their employing *
0012 // * institutes,nor the agencies providing financial support for this *
0013 // * work  make  any representation or  warranty, express or implied, *
0014 // * regarding  this  software system or assume any liability for its *
0015 // * use.  Please see the license in the file  LICENSE  and URL above *
0016 // * for the full disclaimer and the limitation of liability.         *
0017 // *                                                                  *
0018 // * This  code  implementation is the result of  the  scientific and *
0019 // * technical work of the GEANT4 collaboration.                      *
0020 // * By using,  copying,  modifying or  distributing the software (or *
0021 // * any work based  on the software)  you  agree  to acknowledge its *
0022 // * use  in  resulting  scientific  publications,  and indicate your *
0023 // * acceptance of all terms of the Geant4 Software license.          *
0024 // ********************************************************************
0025 //
0026 /// \file processes/phonon/include/G4PhononDownconversion.hh
0027 /// \brief Definition of the G4PhononDownconversion class
0028 //
0029 //
0030 #ifndef G4PhononDownconversion_h
0031 #define G4PhononDownconversion_h 1
0032 
0033 #include "G4VPhononProcess.hh"
0034 
0035 class G4PhononDownconversion : public G4VPhononProcess {
0036 public:
0037   G4PhononDownconversion(const G4String& processName ="phononDownconversion");
0038   virtual ~G4PhononDownconversion();
0039 
0040   virtual G4VParticleChange* PostStepDoIt(const G4Track&, const G4Step& );
0041   
0042   virtual G4bool IsApplicable(const G4ParticleDefinition&);
0043   
0044 protected:
0045   virtual G4double GetMeanFreePath(const G4Track&, G4double, G4ForceCondition*);
0046   
0047 private:
0048   // relative probability that anharmonic decay occurs L->L'+T'
0049   G4double GetLTDecayProb(G4double, G4double) const;
0050   G4double GetTTDecayProb(G4double, G4double) const;
0051   G4double MakeLDeviation(G4double, G4double) const;
0052   G4double MakeTTDeviation(G4double, G4double) const;
0053   G4double MakeTDeviation(G4double, G4double) const;
0054 
0055   void MakeTTSecondaries(const G4Track&);
0056   void MakeLTSecondaries(const G4Track&);
0057 
0058 private:
0059   G4double fBeta, fGamma, fLambda, fMu; // Local buffers for calculations
0060 
0061   // hide assignment operator as private 
0062   G4PhononDownconversion(G4PhononDownconversion&);
0063   G4PhononDownconversion& operator=(const G4PhononDownconversion& right);
0064 };
0065 
0066 #endif