Gabriele Cosmo
119 lines
4.7 KiB
C++
119 lines
4.7 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// INCL++ intra-nuclear cascade model
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// Alain Boudard, CEA-Saclay, France
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// Joseph Cugnon, University of Liege, Belgium
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// Jean-Christophe David, CEA-Saclay, France
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// Pekka Kaitaniemi, CEA-Saclay, France, and Helsinki Institute of Physics, Finland
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// Sylvie Leray, CEA-Saclay, France
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// Davide Mancusi, CEA-Saclay, France
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//
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#define INCLXX_IN_GEANT4_MODE 1
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#include "globals.hh"
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#ifndef G4INCLPHASESPACERAUBOLDLYNCH_HH
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#define G4INCLPHASESPACERAUBOLDLYNCH_HH
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#include "G4INCLThreeVector.hh"
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#include "G4INCLParticle.hh"
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#include "G4INCLIPhaseSpaceGenerator.hh"
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#include "G4INCLInterpolationTable.hh"
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#include <vector>
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namespace G4INCL {
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/// \brief Generate momenta using the RauboldLynch method
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class PhaseSpaceRauboldLynch : public IPhaseSpaceGenerator {
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public:
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PhaseSpaceRauboldLynch();
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virtual ~PhaseSpaceRauboldLynch();
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/// \brief Dummy copy constructor to silence Coverity warning
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PhaseSpaceRauboldLynch(PhaseSpaceRauboldLynch const &other);
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/// \brief Dummy assignment operator to silence Coverity warning
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PhaseSpaceRauboldLynch &operator=(PhaseSpaceRauboldLynch const &rhs);
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/** \brief Generate momenta according to a uniform, Lorentz-invariant phase-space model
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*
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* This function will assign momenta to the particles in the list that is
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* passed as an argument. The event is generated in the CM frame.
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*
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* \param sqrtS total centre-of-mass energy of the system
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* \param particles list of particles
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*/
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void generate(const G4double sqrtS, ParticleList &particles);
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/// \brief Return the largest generated weight
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G4double getMaxGeneratedWeight() const;
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private:
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std::vector<G4double> masses;
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std::vector<G4double> sumMasses;
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std::vector<G4double> rnd;
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std::vector<G4double> invariantMasses;
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std::vector<G4double> momentaCM;
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size_t nParticles;
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G4double sqrtS;
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G4double availableEnergy;
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G4double maxGeneratedWeight;
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static const size_t nMasslessParticlesTable = 13;
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static const size_t wMaxNE = 30;
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static const G4double wMaxMasslessX[wMaxNE];
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static const G4double wMaxMasslessY[wMaxNE];
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static const G4double wMaxCorrectionX[wMaxNE];
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static const G4double wMaxCorrectionY[wMaxNE];
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static const G4double wMaxInterpolationMargin;
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InterpolationTable *wMaxMassless;
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InterpolationTable *wMaxCorrection;
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static const size_t wMaxNP = 20;
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/// \brief Precalculated coefficients: -ln(n)
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G4double prelog[wMaxNP];
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/// \brief Initialize internal structures (masses and sum of masses)
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void initialize(ParticleList &particles);
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/// \brief Compute the maximum possible weight using a naive algorithm
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G4double computeMaximumWeightNaive();
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/// \brief Compute the maximum possible weight using parametrizations
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G4double computeMaximumWeightParam();
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/// \brief Compute the maximum possible weight
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G4double computeWeight();
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/// \brief Generate an event
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void generateEvent(ParticleList &particles);
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};
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}
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#endif // G4INCLPHASESPACERAUBOLDLYNCH_HH
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