| 1 | //
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| 2 | // ********************************************************************
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| 3 | // * License and Disclaimer *
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| 4 | // * *
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of *
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and *
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| 7 | // * conditions of the Geant4 Software License, included in the file *
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These *
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| 9 | // * include a list of copyright holders. *
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| 10 | // * *
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| 11 | // * Neither the authors of this software system, nor their employing *
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| 12 | // * institutes,nor the agencies providing financial support for this *
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| 13 | // * work make any representation or warranty, express or implied, *
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| 14 | // * regarding this software system or assume any liability for its *
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| 15 | // * use. Please see the license in the file LICENSE and URL above *
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| 16 | // * for the full disclaimer and the limitation of liability. *
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| 17 | // * *
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| 18 | // * This code implementation is the result of the scientific and *
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| 19 | // * technical work of the GEANT4 collaboration. *
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| 20 | // * By using, copying, modifying or distributing the software (or *
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| 21 | // * any work based on the software) you agree to acknowledge its *
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| 22 | // * use in resulting scientific publications, and indicate your *
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| 23 | // * acceptance of all terms of the Geant4 Software license. *
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| 24 | // ********************************************************************
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| 25 | //
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| 26 | //
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| 27 | //
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| 28 | //$Id: G4GeneralPhaseSpaceDecay.hh,v 1.1 1997/05/21
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| 29 | // ----------------------------------------------------------------
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| 30 | // GEANT 4 class header file
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| 31 | //
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| 32 | // History: first implementation, A. Feliciello, 20th May 1998
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| 33 | //
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| 34 | // Note: this class is a generalization of the
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| 35 | // G4PhaseSpaceDecayChannel one
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| 36 | // ----------------------------------------------------------------
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| 37 | #ifndef G4GeneralPhaseSpaceDecay_h
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| 38 | #define G4GeneralPhaseSpaceDecay_h 1
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| 39 |
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| 40 | #include "G4ios.hh"
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| 41 | #include "globals.hh"
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| 42 | #include "G4VDecayChannel.hh"
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| 43 | #include "G4HadronicException.hh"
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| 44 |
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| 45 | class G4GeneralPhaseSpaceDecay : public G4VDecayChannel
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| 46 | {
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| 47 | public:
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| 48 | //Constructors
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| 49 | G4GeneralPhaseSpaceDecay(G4int Verbose = 1);
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| 50 |
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| 51 | G4GeneralPhaseSpaceDecay(const G4String& theParentName,
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| 52 | G4double theBR,
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| 53 | G4int theNumberOfDaughters,
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| 54 | const G4String& theDaughterName1,
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| 55 | const G4String& theDaughterName2 = "",
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| 56 | const G4String& theDaughterName3 = "");
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| 57 |
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| 58 | G4GeneralPhaseSpaceDecay(const G4String& theParentName,
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| 59 | G4double theParentMass,
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| 60 | G4double theBR,
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| 61 | G4int theNumberOfDaughters,
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| 62 | const G4String& theDaughterName1,
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| 63 | const G4String& theDaughterName2 = "",
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| 64 | const G4String& theDaughterName3 = "");
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| 65 |
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| 66 | G4GeneralPhaseSpaceDecay(const G4String& theParentName,
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| 67 | G4double theParentMass,
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| 68 | G4double theBR,
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| 69 | G4int theNumberOfDaughters,
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| 70 | const G4String& theDaughterName1,
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| 71 | const G4String& theDaughterName2 ,
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| 72 | const G4String& theDaughterName3 ,
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| 73 | const G4double * masses);
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| 74 |
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| 75 | // Destructor
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| 76 | virtual ~G4GeneralPhaseSpaceDecay();
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| 77 |
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| 78 | public:
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| 79 | G4double GetParentMass() const;
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| 80 | void SetParentMass(const G4double aParentMass);
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| 81 | virtual G4DecayProducts* DecayIt(G4double mass=0.0);
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| 82 | static G4double Pmx(G4double e, G4double p1, G4double p2);
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| 83 |
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| 84 | protected:
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| 85 | G4DecayProducts* OneBodyDecayIt();
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| 86 | G4DecayProducts* TwoBodyDecayIt();
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| 87 | G4DecayProducts* ThreeBodyDecayIt();
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| 88 | G4DecayProducts* ManyBodyDecayIt();
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| 89 |
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| 90 | private:
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| 91 | G4double parentmass;
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| 92 | const G4double * theDaughterMasses;
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| 93 |
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| 94 | };
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| 95 |
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| 96 |
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| 97 |
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| 98 | inline G4double G4GeneralPhaseSpaceDecay::GetParentMass() const
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| 99 | {
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| 100 | return parentmass;
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| 101 | }
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| 102 |
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| 103 | inline void G4GeneralPhaseSpaceDecay::SetParentMass(const G4double aParentMass)
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| 104 | {
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| 105 | parentmass = aParentMass;
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| 106 | }
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| 107 |
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| 108 |
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| 109 |
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| 110 | inline
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| 111 | G4double G4GeneralPhaseSpaceDecay::Pmx(G4double e, G4double p1, G4double p2)
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| 112 | {
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| 113 | // calculate momentum of daughter particles in two-body decay
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| 114 | if (e-p1-p2 < 0 )
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| 115 | {
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| 116 | G4HadronicException(__FILE__, __LINE__, "G4GeneralPhaseSpaceDecay::Pmx energy in cms > mass1+mass2");
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| 117 | }
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| 118 | G4double ppp = (e+p1+p2)*(e+p1-p2)*(e-p1+p2)*(e-p1-p2)/(4.0*e*e);
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| 119 | if (ppp>0) return std::sqrt(ppp);
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| 120 | else return -1.;
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| 121 | }
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| 122 |
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| 123 | #endif
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