| 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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