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25 //
26 //
27 // Geant4 Header : G4HadronElastic
28 //
29 // Author : V.Ivanchenko 29 June 2009 (redesign old elastic model)
30 //
31 // Modified:
32 //
33 // Class Description
34 // Default model for elastic scattering; GHEISHA algorithm is used
35 // Class Description - End
36
37 #ifndef G4HadronElastic_h
38 #define G4HadronElastic_h 1
39
40 #include "globals.hh"
41 #include "G4HadronicInteraction.hh"
42 #include "G4HadProjectile.hh"
43 #include "G4Nucleus.hh"
44 #include "G4NucleiProperties.hh"
45
46 class G4ParticleDefinition;
47
48 class G4HadronElastic : public G4HadronicInteraction
49 {
50 public:
51
52 explicit G4HadronElastic(const G4String& name = "hElasticLHEP");
53
54 ~G4HadronElastic() override;
55
56 // implementation of the G4HadronicInteraction interface
57 G4HadFinalState* ApplyYourself(const G4HadProjectile & aTrack,
58 G4Nucleus & targetNucleus) override;
59
60 // sample momentum transfer using Lab. momentum
61 G4double SampleInvariantT(const G4ParticleDefinition* p, G4double plab,
62 G4int Z, G4int A) override;
63
64 G4double GetSlopeCof( const G4int pdg );
65
66 inline void SetLowestEnergyLimit(G4double value);
67
68 inline G4double LowestEnergyLimit() const;
69
70 inline G4double ComputeMomentumCMS(const G4ParticleDefinition* p,
71 G4double plab, G4int Z, G4int A);
72
73 void ModelDescription(std::ostream&) const override;
74
75 protected:
76
77 G4double pLocalTmax;
78 G4int secID; // Creator model ID for the recoil
79
80 private:
81
82 G4ParticleDefinition* theProton;
83 G4ParticleDefinition* theNeutron;
84 G4ParticleDefinition* theDeuteron;
85 G4ParticleDefinition* theAlpha;
86
87 G4double lowestEnergyLimit;
88 G4int nwarn;
89 };
90
91 inline void G4HadronElastic::SetLowestEnergyLimit(G4double value)
92 {
93 lowestEnergyLimit = value;
94 }
95
96 inline G4double G4HadronElastic::LowestEnergyLimit() const
97 {
98 return lowestEnergyLimit;
99 }
100
101 inline G4double
102 G4HadronElastic::ComputeMomentumCMS(const G4ParticleDefinition* p,
103 G4double plab, G4int Z, G4int A)
104 {
105 G4double m1 = p->GetPDGMass();
106 G4double m12= m1*m1;
107 G4double mass2 = G4NucleiProperties::GetNuclearMass(A, Z);
108 return plab*mass2/std::sqrt(m12 + mass2*mass2 + 2.*mass2*std::sqrt(m12 + plab*plab));
109 }
110
111 #endif
112