INukeOsetTable.h

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/**
 * @brief Table-based implementation of Oset model
 * 
 * @author Tomasz Golan
 * @date 2015
 * @warning Applicable for pion with Tk < 350 MeV
 * @remarks 
 * Tables taken from NuWro's implementation of:
 * E. Oset et al., Nucl. Phys. A484 (1988) 557-592
 * 
 * This implementation is kept from historical reasons.
 * Due to different approach to cascade in GENIE and NuWro there are some normalization issues.
 * Default Oset model can be found in INukeOsetFormula
 * 
*/
 
#ifndef INUKE_OSET_TABLE_H
#define INUKE_OSET_TABLE_H
 
#include "INukeOset.h"
#include <vector>
#include <string>
 
// handle tables with Oset cross sections
class INukeOsetTable : public INukeOset
{
  public:
 
  //! constructor
  INukeOsetTable (const char* filename);  
 
  //! use to set up Oset class (assign pion Tk, nuclear density etc)
  void setupOset (const double &density, const double &pionTk, const int &pionPDG, const double &protonFraction);
 
  private:
  
  //! quasi-elastic piN cross section
  /*! vector contains values in the following order:
   * d0 e0, d0 e1, ... , d0 en, d1 e0 ... \n
   * channel = 0 -> pi+n or pi-p, 1 -> pi+p or pi-n, 2 -> pi0
   */
  std::vector <double> fQelCrossSectionTable [fNChannels]; 
  
  //! charge-exchange piN cross section
  /*! vector contains values in the following order:
   * d0 e0, d0 e1, ... , d0 en, d1 e0 ... \n
   * channel = 0 -> pi+n or pi-p, 1 -> pi+p or pi-n, 2 -> pi0
   */
  std::vector <double> fCexCrossSectionTable [fNChannels];
  
  //! pi absorption cross section
  /*! vector contains values in the following order:
   * d0 e0, d0 e1, ... , d0 en, d1 e0 ...
   */
  std::vector <double> fAbsorptionCrossSectionTable;
 
  unsigned int fNDensityBins; //!< number of denisty bins
  unsigned int fNEnergyBins;  //!< number of energy bins
  double fDensityBinWidth;    //!< density step (must be fixed)
  double fEnergyBinWidth;     //!< energy step (must be fixed)
 
  //! interpolate cross section (method fixed for Oset tables)
  double interpolate (const std::vector<double> &data) const;
 
  //! process single line from table file, push values to proper vector (method fixed for Oset tables)
  int processLine (const std::string &line);
  
  //! check if data in file is consistent (method fixed for Oset tables)
  int checkIntegrity (const double &densityValue, const double &energyValue);
  
  //! stop program and through an error if input file is corrupted (method fixed for Oset tables)
  void badFile (const char* file, const int &errorCode, const int &line = 0) const;
 
  //! calculalte cross sections for each channel
  void setCrossSections ();
 
  //! handle table's index and weights for given density and energy 
  struct PointHandler
  {
    double value;      //!< exact value as read from table
    double lowWeight;  //!< distance from high boundary
    double highWeight; //!< distance from low boundary
    int index;         //!< point index = index of low boundary
    double binWidth;   //!< bin width used to calculate distances
    int nBins;         //!< nBins to check isEdge
    bool isEdge; //!< true if value is on edge of table (should never happen)
 
    PointHandler () : value (-1.0) {}; //!< constructor
 
    //! set up binWidth and nBins
    inline void setHandler (const double &width, const int &bins)
    {
      binWidth = width;
      nBins    = bins;
    }
    
    void update (const double &newValue); //!< update point if changed
  };
 
  PointHandler fDensityHandler; //!< nuclear density handler
  PointHandler fEnergyHandler;  //!< pion kinetic energy handler
};
 
#endif // INUKE_OSET_TABLE_H