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25 //
26 //
27 //
28 // ----------------------------------------------------------------
29 // GEANT 4 class header file
30 //
31 // History: first implementation, A. Feliciello, 20th May 1998
32 //
33 // Note: this class is a generalization of the
34 // G4PhaseSpaceDecayChannel one
35 // ----------------------------------------------------------------
36 #ifndef G4GeneralPhaseSpaceDecay_h
37 #define G4GeneralPhaseSpaceDecay_h 1
38
39 #include "G4ios.hh"
40 #include "globals.hh"
41 #include "G4VDecayChannel.hh"
42 #include "G4HadronicException.hh"
43
44 class G4GeneralPhaseSpaceDecay : public G4VDecayChannel
45 {
46 public:
47 //Constructors
48 G4GeneralPhaseSpaceDecay(G4int Verbose = 1);
49
50 G4GeneralPhaseSpaceDecay(const G4String& theParentName,
51 G4double theBR,
52 G4int theNumberOfDaughters,
53 const G4String& theDaughterName1,
54 const G4String& theDaughterName2 = "",
55 const G4String& theDaughterName3 = "");
56
57 G4GeneralPhaseSpaceDecay(const G4String& theParentName,
58 G4double theParentMass,
59 G4double theBR,
60 G4int theNumberOfDaughters,
61 const G4String& theDaughterName1,
62 const G4String& theDaughterName2 = "",
63 const G4String& theDaughterName3 = "");
64
65 G4GeneralPhaseSpaceDecay(const G4String& theParentName,
66 G4double theParentMass,
67 G4double theBR,
68 G4int theNumberOfDaughters,
69 const G4String& theDaughterName1,
70 const G4String& theDaughterName2 ,
71 const G4String& theDaughterName3 ,
72 const G4double * masses);
73
74 G4GeneralPhaseSpaceDecay(const G4String& theParentName,
75 G4double theParentMass,
76 G4double theBR,
77 G4int theNumberOfDaughters,
78 const G4String& theDaughterName1,
79 const G4String& theDaughterName2 ,
80 const G4String& theDaughterName3 ,
81 const G4String& theDaughterName4 ,
82 const G4double * masses);
83
84 // Destructor
85 virtual ~G4GeneralPhaseSpaceDecay();
86
87 public:
88 G4double GetParentMass() const;
89 void SetParentMass(const G4double aParentMass);
90 virtual G4DecayProducts* DecayIt(G4double mass=0.0);
91 static G4double Pmx(G4double e, G4double p1, G4double p2);
92
93 protected:
94 G4DecayProducts* OneBodyDecayIt();
95 G4DecayProducts* TwoBodyDecayIt();
96 G4DecayProducts* ThreeBodyDecayIt();
97 G4DecayProducts* ManyBodyDecayIt();
98
99 private:
100 G4double parentmass;
101 const G4double * theDaughterMasses;
102
103 };
104
105
106
107 inline G4double G4GeneralPhaseSpaceDecay::GetParentMass() const
108 {
109 return parentmass;
110 }
111
112 inline void G4GeneralPhaseSpaceDecay::SetParentMass(const G4double aParentMass)
113 {
114 parentmass = aParentMass;
115 }
116
117
118
119 inline
120 G4double G4GeneralPhaseSpaceDecay::Pmx(G4double e, G4double p1, G4double p2)
121 {
122 // calculate momentum of daughter particles in two-body decay
123 if (e-p1-p2 < 0 )
124 {
125 throw G4HadronicException(__FILE__, __LINE__, "G4GeneralPhaseSpaceDecay::Pmx energy in cms < mass1+mass2");
126 }
127 G4double ppp = (e+p1+p2)*(e+p1-p2)*(e-p1+p2)*(e-p1-p2)/(4.0*e*e);
128 if (ppp>0) return std::sqrt(ppp);
129 else return -1.;
130 }
131
132 #endif
133