G4PiMinusStopTa.cc

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//
//      File name:     G4PiMinusStopTa
//
//      Author:        Maria Grazia Pia (pia@genova.infn.it)
// 
//      Creation date: 8 May 1998
//
// -------------------------------------------------------------------

#include "G4ios.hh"

#include "G4PiMinusStopTa.hh"

#include <vector>

#include "globals.hh"
#include "Randomize.hh"
#include "G4Proton.hh"
#include "G4Neutron.hh"
#include "G4ParticleTypes.hh"
#include "G4ReactionKinematics.hh"
#include "G4DynamicParticleVector.hh"
#include "G4LorentzVector.hh"
#include "G4PiMinusStopMaterial.hh"
#include "G4DistributionGenerator.hh"

// np/pp production ratio
// Experimental values: 
// R(np/pp) = 6.3 +- 1.4 (R. Madey  et al., Phys Rev C25 (1982) 3050
G4double G4PiMinusStopTa::npRatio = 17.;
 
// Average numbers of final nucleons detected, for N-pair absorption
// (R. Madey  et al., Phys Rev C25 (1982) 3050
G4double G4PiMinusStopTa::nFinalNucleons = 1.8;

// Kinetic energy (MeV) distributions measured for coincident nucleon 
// emission
// (R. Madey  et al., Phys Rev C25 (1982) 3050

G4int G4PiMinusStopTa::eKinEntries = 10;

G4double G4PiMinusStopTa::eKinData[10] = { 0.24, 0.59, 1.13, 1.38,
                                     1.50, 
                     1.38, 1.13, 0.83, 0.49, 0.22};

G4double G4PiMinusStopTa::eKin[11] = { 5.2, 12., 25., 41.5,
                                  49.6,
                  57.7, 79.3, 94.4, 104., 120., 140.};


// Opening angle distributions measured for coincident nucleon emission
// (P.Heusi et al., Nucl. Phys. A407 (1983) 429

G4int G4PiMinusStopTa::angleEntries = 7;

G4double G4PiMinusStopTa::angleData[7] = 
{ 1.43, 1.67, 2.62, 4.29, 7.62, 11.90, 14.76 };

G4double G4PiMinusStopTa::angle[8] = { 1.308997, 1.570796, 1.832596, 2.094395, 
                  2.356194, 2.617994, 2.967060, 3.1415927 };



// Constructor

G4PiMinusStopTa::G4PiMinusStopTa()
{
  // Cluster size: nucleon pair, alpha, triton etc.
  // First implementation: interaction with nucleon pair only
  _clusterSize = 2;

  // R ratio
  theR = 1. / (1. + npRatio);

  _definitions = new std::vector<G4ParticleDefinition*>();
  _momenta = new std::vector<G4LorentzVector*>();

  std::vector<double> eKinVector;
  std::vector<double> eKinDataVector;
  int i;
  for (i=0; i<eKinEntries; i++)
    {
      eKinVector.push_back(eKin[i]);
      eKinDataVector.push_back(eKinData[i]);
    }
  eKinVector.push_back(eKin[eKinEntries]);
  _distributionE = new G4DistributionGenerator(eKinVector,eKinDataVector);

  std::vector<double> angleVector;
  std::vector<double> angleDataVector;
  for (i=0; i<angleEntries; i++)
    {
      angleVector.push_back(angle[i]);
      angleDataVector.push_back(angleData[i]);
    }
  angleVector.push_back(angle[angleEntries]);
  _distributionAngle = new G4DistributionGenerator(angleVector,angleDataVector);
}


// Destructor

G4PiMinusStopTa::~G4PiMinusStopTa()
{}

G4double G4PiMinusStopTa::FinalNucleons()
{
  return nFinalNucleons;
}