DMaterial.h

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// $Id$
//
//    File: DMaterial.h
// Created: Fri Apr 25 15:44:12 EDT 2008
// Creator: davidl (on Darwin swire-d95.jlab.org 8.11.1 i386)
//

#ifndef _DMaterial_
#define _DMaterial_

#include <string>
#include <string.h>
using std::string;

#include <particleType.h>


/// The DMaterial class holds information on a single material type. The
/// main purpose is to hold information needed to estimate energy loss and
/// multiple scattering for particles being swum through the detector.
/// The GetdEdx() method can be used to calculate dE/dx through this
/// material for a given particle type and mometum using the Bethe
/// formula. 

class DMaterial{
   public:
      DMaterial(string &name, double A, double Z, double density, double radlen);
      virtual ~DMaterial(){}
   
      double GetRadiationLength(void) const {return kXo;}
      double GetDensity(void) const {return kdensity;}
      double GetAtomicWeight(void) const {return kA;}
      double GetAtomicNumber(void) const {return kZ;}
      double GetdEdx(Particle_t ptype, double kp);
      const string& GetName(void) const {return kname;}

      double Xo(void) const {return kXo;}
      double rho(void) const {return kdensity;}
      double A(void) const {return kA;}
      double Z(void) const {return kZ;}
      
      string toString(void);

   private:
      DMaterial(); ///< Prevent use of trivial constructor
   
      double kXo; ///< radiation length of this material
      double kdensity; ///< denisty of material in g/cm^3
      double kA; ///< Effective atomic weight
      double kZ; ///< Effective atomic number
      string kname;

      Particle_t last_ptype;
      double last_p;
      double last_dEdx;
      
      void GetMaterials(void);
};

#endif // _DMaterial_