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26 //
27 // -------------------------------------------------------------------
28 // GEANT4 Class file
29 //
30 // For information related to this code contact:
31 //
32 // File name: G4VElasticCollision
33 //
34 // Author: Maria Grazia Pia
35 //
36 // Creation date: 15 April 1999
37 //
38 // Modifications:
39 //
40 // -------------------------------------------------------------------
41
42 #ifndef G4VSCATTERINGCOLLISION_HH
43 #define G4VSCATTERINGCOLLISION_HH
44
45 #include "globals.hh"
46 #include "G4Log.hh"
47 #include "G4VCollision.hh"
48 #include "G4VCrossSectionSource.hh"
49 #include "G4VAngularDistribution.hh"
50 #include "G4KineticTrackVector.hh"
51
52 class G4KineticTrack;
53
54
55 class G4VScatteringCollision : public G4VCollision
56 {
57
58 public:
59
60 G4VScatteringCollision();
61 void establish_G4MT_TLS_G4VScatteringCollision();
62 virtual ~G4VScatteringCollision();
63
64 G4bool operator==(const G4VScatteringCollision &right) const;
65 G4bool operator!=(const G4VScatteringCollision &right) const;
66
67 virtual G4KineticTrackVector* FinalState(const G4KineticTrack& trk1,
68 const G4KineticTrack& trk2) const;
69 virtual const G4VAngularDistribution* GetAngularDistribution() const
70 {
71 return theAngularDistribution;
72 }
73
74 private:
75 G4VScatteringCollision(const G4VScatteringCollision &);
76 G4VScatteringCollision & operator= (const G4VScatteringCollision &);
77
78 protected:
79
80 virtual const std::vector<const G4ParticleDefinition*> & GetOutgoingParticles() const = 0;
81
82 private:
83
84 double BrWigInt0(const double x, const double gamma, const double m0) const
85 { return 2.0*gamma*std::atan( 2.0 * (x-m0)/ gamma ); }
86
87 G4double BrWigInt1(const G4double x, const G4double gamma, const G4double m0) const
88 { return 0.5*gamma*gamma*G4Log( (x-m0)*(x-m0)+gamma*gamma/4.0 ) + m0*BrWigInt0(x,gamma,m0); }
89
90 double BrWigInv(const double x, const double gamma, const double m0) const
91 { return 0.5*gamma*std::tan( 0.5*x/gamma )+m0; }
92
93 double SampleResonanceMass(const double poleMass,
94 const double width,
95 const double minMass,
96 const double maxMass) const;
97 private:
98
99 G4VAngularDistribution * theAngularDistribution;
100
101 };
102
103
104
105
106 #endif
107