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25 //
26 // INCL++ intra-nuclear cascade model
27 // Alain Boudard, CEA-Saclay, France
28 // Joseph Cugnon, University of Liege, Belgium
29 // Jean-Christophe David, CEA-Saclay, France
30 // Pekka Kaitaniemi, CEA-Saclay, France, and Helsinki Institute of Physics, Finland
31 // Sylvie Leray, CEA-Saclay, France
32 // Davide Mancusi, CEA-Saclay, France
33 //
34 #define INCLXX_IN_GEANT4_MODE 1
35
36 #include "globals.hh"
37
38 #ifndef G4INCLPHASESPACERAUBOLDLYNCH_HH
39 #define G4INCLPHASESPACERAUBOLDLYNCH_HH
40
41 #include "G4INCLThreeVector.hh"
42 #include "G4INCLParticle.hh"
43 #include "G4INCLIPhaseSpaceGenerator.hh"
44 #include "G4INCLInterpolationTable.hh"
45 #include <vector>
46
47 namespace G4INCL {
48 /// \brief Generate momenta using the RauboldLynch method
49 class PhaseSpaceRauboldLynch : public IPhaseSpaceGenerator {
50
51 public:
52 PhaseSpaceRauboldLynch();
53 virtual ~PhaseSpaceRauboldLynch();
54
55 /// \brief Dummy copy constructor to silence Coverity warning
56 PhaseSpaceRauboldLynch(PhaseSpaceRauboldLynch const &other);
57
58 /// \brief Dummy assignment operator to silence Coverity warning
59 PhaseSpaceRauboldLynch &operator=(PhaseSpaceRauboldLynch const &rhs);
60
61 /** \brief Generate momenta according to a uniform, Lorentz-invariant phase-space model
62 *
63 * This function will assign momenta to the particles in the list that is
64 * passed as an argument. The event is generated in the CM frame.
65 *
66 * \param sqrtS total centre-of-mass energy of the system
67 * \param particles list of particles
68 */
69 void generate(const G4double sqrtS, ParticleList &particles);
70
71 /// \brief Return the largest generated weight
72 G4double getMaxGeneratedWeight() const;
73
74 private:
75 std::vector<G4double> masses;
76 std::vector<G4double> sumMasses;
77 std::vector<G4double> rnd;
78 std::vector<G4double> invariantMasses;
79 std::vector<G4double> momentaCM;
80 size_t nParticles;
81 G4double sqrtS;
82 G4double availableEnergy;
83 G4double maxGeneratedWeight;
84
85 static const size_t nMasslessParticlesTable = 13;
86 static const size_t wMaxNE = 30;
87 static const G4double wMaxMasslessX[wMaxNE];
88 static const G4double wMaxMasslessY[wMaxNE];
89 static const G4double wMaxCorrectionX[wMaxNE];
90 static const G4double wMaxCorrectionY[wMaxNE];
91 static const G4double wMaxInterpolationMargin;
92
93 InterpolationTable *wMaxMassless;
94 InterpolationTable *wMaxCorrection;
95
96 static const size_t wMaxNP = 20;
97
98 /// \brief Precalculated coefficients: -ln(n)
99 G4double prelog[wMaxNP];
100
101 /// \brief Initialize internal structures (masses and sum of masses)
102 void initialize(ParticleList &particles);
103
104 /// \brief Compute the maximum possible weight using a naive algorithm
105 G4double computeMaximumWeightNaive();
106
107 /// \brief Compute the maximum possible weight using parametrizations
108 G4double computeMaximumWeightParam();
109
110 /// \brief Compute the maximum possible weight
111 G4double computeWeight();
112
113 /// \brief Generate an event
114 void generateEvent(ParticleList &particles);
115 };
116 }
117
118 #endif // G4INCLPHASESPACERAUBOLDLYNCH_HH
119