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25 //
26 //
27 //
28 //
29 // ------------------------------------------------------------
30 // GEANT 4 class header file
31 //
32 //
33 #ifndef G4UnknownDecay_h
34 #define G4UnknownDecay_h 1
35
36 #include <CLHEP/Units/PhysicalConstants.h>
37
38 #include "G4ios.hh"
39 #include "globals.hh"
40 #include "G4VDiscreteProcess.hh"
41 #include "G4ParticleChangeForDecay.hh"
42
43 class G4UnknownDecay : public G4VDiscreteProcess
44 {
45 // Class Description
46 // This class is a decay process for "unknown" particle.
47
48 public:
49 // Constructors
50 G4UnknownDecay(const G4String& processName ="UnknownDecay");
51
52 // Destructor
53 virtual ~G4UnknownDecay();
54
55 private:
56 // copy constructor
57 G4UnknownDecay(const G4UnknownDecay &right);
58
59 // Assignment Operation (generated)
60 G4UnknownDecay & operator=(const G4UnknownDecay &right);
61
62 public: //With Description
63
64 virtual G4VParticleChange *PostStepDoIt(
65 const G4Track& aTrack,
66 const G4Step& aStep
67 ) override;
68
69 virtual void BuildPhysicsTable(const G4ParticleDefinition&) override;
70 // In G4UnknownDecay, thePhysicsTable stores values of
71 // beta * std::sqrt( 1 - beta*beta)
72 // as a function of normalized kinetic enregy (=Ekin/mass),
73 // becasuse this table is universal for all particle types,
74
75
76 virtual G4bool IsApplicable(const G4ParticleDefinition&) override;
77 // returns "true" if the decay process can be applied to
78 // the particle type.
79
80 virtual void ProcessDescription(std::ostream& outFile) const override;
81 //
82
83 protected: // With Description
84 virtual G4VParticleChange* DecayIt(
85 const G4Track& aTrack,
86 const G4Step& aStep
87 ) ;
88 // The DecayIt() method returns by pointer a particle-change object,
89 // which has information of daughter particles.
90
91 public:
92
93 virtual G4double PostStepGetPhysicalInteractionLength(
94 const G4Track& track,
95 G4double previousStepSize,
96 G4ForceCondition* condition
97 ) override;
98
99
100 protected: // With Description
101 // GetMeanFreePath returns ctau*beta*gamma for decay in flight
102 virtual G4double GetMeanFreePath(const G4Track& aTrack,
103 G4double previousStepSize,
104 G4ForceCondition* condition
105 ) override;
106
107 private:
108 G4int verboseLevel;
109 // controle flag for output message
110 // 0: Silent
111 // 1: Warning message
112 // 2: More
113
114 private:
115 // HighestValue.
116 const G4double HighestValue;
117
118 // ParticleChange for decay process
119 G4ParticleChangeForDecay fParticleChangeForDecay;
120
121 };
122
123 inline
124 G4double G4UnknownDecay::PostStepGetPhysicalInteractionLength(
125 const G4Track& track,
126 G4double /*previousStepSize*/,
127 G4ForceCondition* condition
128 )
129 {
130 // pre-assigned UnknownDecay time
131 G4double pTime = track.GetDynamicParticle()->GetPreAssignedDecayProperTime();
132
133 if (pTime < 0.) pTime = DBL_MIN;
134
135 // condition is set to "Not Forced"
136 *condition = NotForced;
137
138 // reminder proper time
139 G4double remainder = pTime - track.GetProperTime();
140 if (remainder <= 0.0) remainder = DBL_MIN;
141
142 // use pre-assigned Decay time to determine PIL
143 //return GetMeanFreePath(track, previousStepSize, condition);
144 return remainder*CLHEP::c_light;
145
146 }
147
148 inline
149 G4VParticleChange* G4UnknownDecay::PostStepDoIt(
150 const G4Track& aTrack,
151 const G4Step& aStep
152 )
153 {
154 return DecayIt(aTrack, aStep);
155 }
156
157 #endif
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