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25 //
26 //
27 //
28 //
29 // ------------------------------------------------------------
30 // GEANT 4 class header file
31 //
32 // History: first implementation, based on object model of
33 // 7 July 1996 H.Kurashige
34 // ------------------------------------------------------------
35 // New Physics scheme 18 Jan. 1997 H.Kurahige
36 // ------------------------------------------------------------
37 // modified 4 Feb. 1997 H.Kurahige
38 // modified 8 Sep. 1997 H.Kurahige
39 // remove BuildPhysicsTable() 27 Nov. 1997 H.Kurashige
40 // modified for new ParticleChange 12 Mar. 1998 H.Kurashige
41 // added aPhysicsTable 2 Aug. 1998 H.Kurashige
42 // PreAssignedDecayTime 18 Jan. 2001 H.Kurashige
43 // Add External Decayer 23 Feb. 2001 H.Kurashige
44 // Remove PhysicsTable 12 Feb. 2002 H.Kurashige
45 // Fixed bug in PostStepGPIL
46 // in case of stopping during AlongStepDoIt 12 Mar. 2004 H.Kurashige
47 // Add GetRemainderLifeTime 10 Aug/2004 H.Kurashige
48 // Add DaughterPolarization 23 July 2008 H.Kurashige
49
50
51 #ifndef G4Decay_h
52 #define G4Decay_h 1
53
54 #include "G4ios.hh"
55 #include "globals.hh"
56 #include "G4VRestDiscreteProcess.hh"
57 #include "G4ParticleChangeForDecay.hh"
58 #include "G4DecayProcessType.hh"
59
60 class G4VExtDecayer;
61
62 class G4Decay : public G4VRestDiscreteProcess
63 {
64 // Class Description
65 // This class is a decay process
66
67 public:
68 // Constructors
69 G4Decay(const G4String& processName ="Decay");
70
71 // Destructor
72 virtual ~G4Decay();
73
74 private:
75 // copy constructor
76 G4Decay(const G4Decay &right);
77
78 // Assignment Operation (generated)
79 G4Decay & operator=(const G4Decay &right);
80
81 public: //With Description
82 // G4Decay Process has both
83 // PostStepDoIt (for decay in flight)
84 // and
85 // AtRestDoIt (for decay at rest)
86
87 virtual G4VParticleChange *PostStepDoIt(
88 const G4Track& aTrack,
89 const G4Step& aStep
90 ) override;
91
92 virtual G4VParticleChange* AtRestDoIt(
93 const G4Track& aTrack,
94 const G4Step& aStep
95 ) override;
96
97 virtual void BuildPhysicsTable(const G4ParticleDefinition&) override;
98 // In G4Decay, thePhysicsTable stores values of
99 // beta * std::sqrt( 1 - beta*beta)
100 // as a function of normalized kinetic enregy (=Ekin/mass),
101 // becasuse this table is universal for all particle types,
102
103
104 virtual G4bool IsApplicable(const G4ParticleDefinition&) override;
105 // returns "true" if the decay process can be applied to
106 // the particle type.
107
108 protected: // With Description
109 virtual G4VParticleChange* DecayIt(
110 const G4Track& aTrack,
111 const G4Step& aStep
112 );
113 // The DecayIt() method returns by pointer a particle-change object,
114 // which has information of daughter particles.
115
116 // Set daughter polarization
117 // NO OPERATION in the base class of G4Decay
118 virtual void DaughterPolarization(const G4Track& aTrack,
119 G4DecayProducts* products);
120
121 public:
122 virtual G4double AtRestGetPhysicalInteractionLength(
123 const G4Track& track,
124 G4ForceCondition* condition
125 ) override;
126
127 virtual G4double PostStepGetPhysicalInteractionLength(
128 const G4Track& track,
129 G4double previousStepSize,
130 G4ForceCondition* condition
131 ) override;
132
133 protected: // With Description
134 // GetMeanFreePath returns ctau*beta*gamma for decay in flight
135 // GetMeanLifeTime returns ctau for decay at rest
136 virtual G4double GetMeanFreePath(const G4Track& aTrack,
137 G4double previousStepSize,
138 G4ForceCondition* condition
139 ) override;
140
141 virtual G4double GetMeanLifeTime(const G4Track& aTrack,
142 G4ForceCondition* condition
143 ) override;
144
145 public: //With Description
146 virtual void StartTracking(G4Track*) override;
147 virtual void EndTracking() override;
148 // inform Start/End of tracking for each track to the physics process
149
150 public: //With Description
151 void SetExtDecayer(G4VExtDecayer*);
152 const G4VExtDecayer* GetExtDecayer() const;
153 // Set/Get External Decayer
154
155 G4double GetRemainderLifeTime() const;
156 //Get Remainder of life time at rest decay
157
158 virtual void ProcessDescription(std::ostream& outFile) const override;
159 //
160
161 protected:
162 G4int verboseLevel;
163 // controle flag for output message
164 // 0: Silent
165 // 1: Warning message
166 // 2: More
167
168 protected:
169 // HighestValue.
170 const G4double HighestValue;
171
172 // Remainder of life time at rest
173 G4double fRemainderLifeTime;
174
175 // ParticleChange for decay process
176 G4ParticleChangeForDecay fParticleChangeForDecay;
177
178 // External Decayer
179 G4VExtDecayer* pExtDecayer;
180 };
181
182 inline
183 G4VParticleChange* G4Decay::AtRestDoIt(
184 const G4Track& aTrack,
185 const G4Step& aStep
186 )
187 {
188 return DecayIt(aTrack, aStep);
189 }
190
191
192 inline
193 const G4VExtDecayer* G4Decay::GetExtDecayer() const
194 {
195 return pExtDecayer;
196 }
197
198 inline
199 G4double G4Decay::GetRemainderLifeTime() const
200 {
201 return fRemainderLifeTime;
202 }
203
204 #endif
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