G4HEAntiXiZeroInelastic.cc

Go to the documentation of this file.

//
// ********************************************************************
// * License and Disclaimer                                           *
// *                                                                  *
// * The  Geant4 software  is  copyright of the Copyright Holders  of *
// * the Geant4 Collaboration.  It is provided  under  the terms  and *
// * conditions of the Geant4 Software License,  included in the file *
// * LICENSE and available at  http://cern.ch/geant4/license .  These *
// * include a list of copyright holders.                             *
// *                                                                  *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work  make  any representation or  warranty, express or implied, *
// * regarding  this  software system or assume any liability for its *
// * use.  Please see the license in the file  LICENSE  and URL above *
// * for the full disclaimer and the limitation of liability.         *
// *                                                                  *
// * This  code  implementation is the result of  the  scientific and *
// * technical work of the GEANT4 collaboration.                      *
// * By using,  copying,  modifying or  distributing the software (or *
// * any work based  on the software)  you  agree  to acknowledge its *
// * use  in  resulting  scientific  publications,  and indicate your *
// * acceptance of all terms of the Geant4 Software license.          *
// ********************************************************************
//
// $Id$
//

// G4 Process: Gheisha High Energy Collision model.
// This includes the high energy cascading model, the two-body-resonance model
// and the low energy two-body model. Not included are the low energy stuff
// like nuclear reactions, nuclear fission without any cascading and all
// processes for particles at rest.  
// First work done by J.L.Chuma and F.W.Jones, TRIUMF, June 96.  
// H. Fesefeldt, RWTH-Aachen, 23-October-1996
 
#include "G4HEAntiXiZeroInelastic.hh"
#include "globals.hh"
#include "G4ios.hh"
#include "G4PhysicalConstants.hh"

void G4HEAntiXiZeroInelastic::ModelDescription(std::ostream& outFile) const
{
  outFile << "G4HEAntiXiZeroInelastic is one of the High Energy\n"
          << "Parameterized (HEP) models used to implement inelastic\n"
          << "anti-Xi0 scattering from nuclei.  It is a re-engineered\n"
          << "version of the GHEISHA code of H. Fesefeldt.  It divides the\n"
          << "initial collision products into backward- and forward-going\n"
          << "clusters which are then decayed into final state hadrons.\n"
          << "The model does not conserve energy on an event-by-event\n"
          << "basis.  It may be applied to anti-Xi0 with initial energies\n"
          << "above 20 GeV.\n";
}


G4HadFinalState*
G4HEAntiXiZeroInelastic::ApplyYourself(const G4HadProjectile& aTrack,
                                       G4Nucleus& targetNucleus)
{
  G4HEVector* pv = new G4HEVector[MAXPART];
  const G4HadProjectile* aParticle = &aTrack;
  const G4double A = targetNucleus.GetA_asInt();
  const G4double Z = targetNucleus.GetZ_asInt();
  G4HEVector incidentParticle(aParticle);
     
  G4double atomicNumber = Z;
  G4double atomicWeight = A;

  G4int incidentCode = incidentParticle.getCode();
  G4double incidentMass = incidentParticle.getMass();
  G4double incidentTotalEnergy = incidentParticle.getEnergy();

  // G4double incidentTotalMomentum = incidentParticle.getTotalMomentum();
  // DHW 19 May 2011: variable set but not used

  G4double incidentKineticEnergy = incidentTotalEnergy - incidentMass;

  if (incidentKineticEnergy < 1.)
    G4cout << "GHEAntiXiZeroInelastic: incident energy < 1 GeV" << G4endl;

  if (verboseLevel > 1) {
    G4cout << "G4HEAntiXiZeroInelastic::ApplyYourself" << G4endl;
    G4cout << "incident particle " << incidentParticle.getName()
           << "mass "              << incidentMass
           << "kinetic energy "    << incidentKineticEnergy
           << G4endl;
    G4cout << "target material with (A,Z) = (" 
           << atomicWeight << "," << atomicNumber << ")" << G4endl;
  }
    
  G4double inelasticity = NuclearInelasticity(incidentKineticEnergy, 
                                              atomicWeight, atomicNumber);
  if (verboseLevel > 1)
    G4cout << "nuclear inelasticity = " << inelasticity << G4endl;
    
  incidentKineticEnergy -= inelasticity;
    
  G4double excitationEnergyGNP = 0.;
  G4double excitationEnergyDTA = 0.; 

  G4double excitation = NuclearExcitation(incidentKineticEnergy,
                                          atomicWeight, atomicNumber,
                                          excitationEnergyGNP,
                                          excitationEnergyDTA);
  if (verboseLevel > 1)
    G4cout << "nuclear excitation = " << excitation << excitationEnergyGNP 
           << excitationEnergyDTA << G4endl;             

  incidentKineticEnergy -= excitation;
  incidentTotalEnergy = incidentKineticEnergy + incidentMass;
  // incidentTotalMomentum = std::sqrt((incidentTotalEnergy-incidentMass)                    
  //                                  *(incidentTotalEnergy+incidentMass));
  // DHW 19 May 2011: variable set but not used

  G4HEVector targetParticle;
  if (G4UniformRand() < atomicNumber/atomicWeight) { 
    targetParticle.setDefinition("Proton");
  } else { 
    targetParticle.setDefinition("Neutron");
  }

  G4double targetMass = targetParticle.getMass();
  G4double centerOfMassEnergy = std::sqrt(incidentMass*incidentMass
                                        + targetMass*targetMass
                                        + 2.0*targetMass*incidentTotalEnergy);
  G4double availableEnergy = centerOfMassEnergy - targetMass - incidentMass;

  G4bool inElastic = true;
  vecLength = 0;           
        
  if (verboseLevel > 1)
    G4cout << "ApplyYourself: CallFirstIntInCascade for particle "
           << incidentCode << G4endl;

  G4bool successful = false; 
    
  FirstIntInCasAntiXiZero(inElastic, availableEnergy, pv, vecLength,
                          incidentParticle, targetParticle, atomicWeight);

  if (verboseLevel > 1)
    G4cout << "ApplyYourself::StrangeParticlePairProduction" << G4endl;

  if ((vecLength > 0) && (availableEnergy > 1.)) 
    StrangeParticlePairProduction(availableEnergy, centerOfMassEnergy,
                                  pv, vecLength,
                                  incidentParticle, targetParticle);

  HighEnergyCascading(successful, pv, vecLength,
                      excitationEnergyGNP, excitationEnergyDTA,
                      incidentParticle, targetParticle,
                      atomicWeight, atomicNumber);
  if (!successful)
    HighEnergyClusterProduction(successful, pv, vecLength,
                                excitationEnergyGNP, excitationEnergyDTA,
                                incidentParticle, targetParticle,
                                atomicWeight, atomicNumber);
  if (!successful) 
    MediumEnergyCascading(successful, pv, vecLength, 
                          excitationEnergyGNP, excitationEnergyDTA, 
                          incidentParticle, targetParticle,
                          atomicWeight, atomicNumber);

  if (!successful)
    MediumEnergyClusterProduction(successful, pv, vecLength,
                                  excitationEnergyGNP, excitationEnergyDTA,       
                                  incidentParticle, targetParticle,
                                  atomicWeight, atomicNumber);
  if (!successful)
    QuasiElasticScattering(successful, pv, vecLength,
                           excitationEnergyGNP, excitationEnergyDTA,
                           incidentParticle, targetParticle, 
                           atomicWeight, atomicNumber);
  if (!successful)
    ElasticScattering(successful, pv, vecLength,
                      incidentParticle,    
                      atomicWeight, atomicNumber);
  if (!successful)
    G4cout << "GHEInelasticInteraction::ApplyYourself fails to produce final state particles"
           << G4endl;

  FillParticleChange(pv, vecLength);
  delete [] pv;
  theParticleChange.SetStatusChange(stopAndKill);
  return &theParticleChange;
}


void
G4HEAntiXiZeroInelastic::FirstIntInCasAntiXiZero(G4bool& inElastic,
                                                 const G4double availableEnergy,
                                                 G4HEVector pv[],
                                                 G4int& vecLen,
                                                 const G4HEVector& incidentParticle,
                                                 const G4HEVector& targetParticle,
                                                 const G4double atomicWeight)

// AntiXi0 undergoes interaction with nucleon within a nucleus.  
// As in Geant3, we think that this routine has absolutely no influence
// on the whole performance of the program. Take AntiLambda instaed. 
// ( decay Xi0 -> L Pi > 99 % )
{
  static const G4double expxu = 82.;     // upper bound for arg. of exp
  static const G4double expxl = -expxu;  // lower bound for arg. of exp

  static const G4double protb = 0.7;
  static const G4double neutb = 0.7;
  static const G4double     c = 1.25;

  static const G4int numMul   = 1200;
  static const G4int numMulAn = 400;
  static const G4int numSec   = 60;

  G4int protonCode  = Proton.getCode();

  G4int targetCode = targetParticle.getCode();
  G4double incidentTotalMomentum = incidentParticle.getTotalMomentum();

  static G4bool first = true;
  static G4double protmul[numMul],  protnorm[numSec];   // proton constants
  static G4double protmulAn[numMulAn],protnormAn[numSec]; 
  static G4double neutmul[numMul],  neutnorm[numSec];   // neutron constants
  static G4double neutmulAn[numMulAn],neutnormAn[numSec];

  //  misc. local variables
  //  npos = number of pi+,  nneg = number of pi-,  nzero = number of pi0

  G4int i, counter, nt, npos, nneg, nzero;

   if( first ) 
     {           // compute normalization constants, this will only be done once
       first = false;
       for( i=0; i<numMul  ; i++ ) protmul[i]  = 0.0;
       for( i=0; i<numSec  ; i++ ) protnorm[i] = 0.0;
       counter = -1;
       for( npos=0; npos<(numSec/3); npos++ ) 
          {
            for( nneg=std::max(0,npos-2); nneg<=(npos+1); nneg++ ) 
               {
                 for( nzero=0; nzero<numSec/3; nzero++ ) 
                    {
                      if( ++counter < numMul ) 
                        {
                          nt = npos+nneg+nzero;
                          if( (nt>0) && (nt<=numSec) ) 
                            {
                              protmul[counter] = pmltpc(npos,nneg,nzero,nt,protb,c);
                              protnorm[nt-1] += protmul[counter];
                            }
                        }
                    }
               }
          }
       for( i=0; i<numMul; i++ )neutmul[i]  = 0.0;
       for( i=0; i<numSec; i++ )neutnorm[i] = 0.0;
       counter = -1;
       for( npos=0; npos<numSec/3; npos++ ) 
          {
            for( nneg=std::max(0,npos-1); nneg<=(npos+2); nneg++ ) 
               {
                 for( nzero=0; nzero<numSec/3; nzero++ ) 
                    {
                      if( ++counter < numMul ) 
                        {
                          nt = npos+nneg+nzero;
                          if( (nt>0) && (nt<=numSec) ) 
                            {
                               neutmul[counter] = pmltpc(npos,nneg,nzero,nt,neutb,c);
                               neutnorm[nt-1] += neutmul[counter];
                            }
                        }
                    }
               }
          }
       for( i=0; i<numSec; i++ ) 
          {
            if( protnorm[i] > 0.0 )protnorm[i] = 1.0/protnorm[i];
            if( neutnorm[i] > 0.0 )neutnorm[i] = 1.0/neutnorm[i];
          }
                                                                   // annihilation
       for( i=0; i<numMulAn  ; i++ ) protmulAn[i]  = 0.0;
       for( i=0; i<numSec    ; i++ ) protnormAn[i] = 0.0;
       counter = -1;
       for( npos=1; npos<(numSec/3); npos++ ) 
          {
            nneg = std::max(0,npos-1); 
            for( nzero=0; nzero<numSec/3; nzero++ ) 
               {
                 if( ++counter < numMulAn ) 
                   {
                     nt = npos+nneg+nzero;
                     if( (nt>1) && (nt<=numSec) ) 
                       {
                         protmulAn[counter] = pmltpc(npos,nneg,nzero,nt,protb,c);
                         protnormAn[nt-1] += protmulAn[counter];
                       }
                   }
               }
          }
       for( i=0; i<numMulAn; i++ ) neutmulAn[i]  = 0.0;
       for( i=0; i<numSec;   i++ ) neutnormAn[i] = 0.0;
       counter = -1;
       for( npos=0; npos<numSec/3; npos++ ) 
          {
            nneg = npos; 
            for( nzero=0; nzero<numSec/3; nzero++ ) 
               {
                 if( ++counter < numMulAn ) 
                   {
                     nt = npos+nneg+nzero;
                     if( (nt>1) && (nt<=numSec) ) 
                       {
                          neutmulAn[counter] = pmltpc(npos,nneg,nzero,nt,neutb,c);
                          neutnormAn[nt-1] += neutmulAn[counter];
                       }
                   }
               }
          }
       for( i=0; i<numSec; i++ ) 
          {
            if( protnormAn[i] > 0.0 )protnormAn[i] = 1.0/protnormAn[i];
            if( neutnormAn[i] > 0.0 )neutnormAn[i] = 1.0/neutnormAn[i];
          }
     }                                          // end of initialization

         
                                              // initialize the first two places
                                              // the same as beam and target                                    
   pv[0] = incidentParticle;
   pv[1] = targetParticle;
   vecLen = 2;

   if( !inElastic ) 
     {                                        // some two-body reactions 
       G4double cech[] = {0.50, 0.45, 0.40, 0.35, 0.30, 0.25, 0.06, 0.04, 0.005, 0.};

       G4int iplab = std::min(9, G4int( incidentTotalMomentum*2.5 ));
       if( G4UniformRand() < cech[iplab]/std::pow(atomicWeight,0.42) ) 
         {           
           G4double ran = G4UniformRand();

           if ( targetCode == protonCode)
             {
               if(ran < 0.2)
                 {
                   pv[0] = AntiSigmaZero;
                 }
               else if (ran < 0.4)
                 {
                   pv[0] = AntiSigmaMinus;
                   pv[1] = Neutron;
                 }
               else if (ran < 0.6)
                 {
                   pv[0] = Proton;
                   pv[1] = AntiLambda;
                 }
               else if (ran < 0.8)
                 {
                   pv[0] = Proton;
                   pv[1] = AntiSigmaZero;
                 }
               else
                 {
                   pv[0] = Neutron;
                   pv[1] = AntiSigmaMinus;
                 }     
             }
           else
             {
               if (ran < 0.2)
                 {
                   pv[0] = AntiSigmaZero;
                 }
               else if (ran < 0.4)
                 {
                   pv[0] = AntiSigmaPlus;
                   pv[1] = Proton;
                 }
               else if (ran < 0.6)
                 {
                   pv[0] = Neutron;
                   pv[1] = AntiLambda;
                 }
               else if (ran < 0.8)
                 {
                   pv[0] = Neutron;
                   pv[1] = AntiSigmaZero;
                 }
               else
                 {
                   pv[0] = Proton;
                   pv[1] = AntiSigmaPlus;
                 } 
             }  
         }   
       return;
     }
   else if (availableEnergy <= PionPlus.getMass())
       return;

                                                  //   inelastic scattering

   npos = 0; nneg = 0; nzero = 0;
   G4double anhl[] = {1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 0.97, 0.88, 
                      0.85, 0.81, 0.75, 0.64, 0.64, 0.55, 0.55, 0.45, 0.47, 0.40, 
                      0.39, 0.36, 0.33, 0.10, 0.01};
   G4int            iplab =      G4int( incidentTotalMomentum*10.);
   if ( iplab >  9) iplab = 10 + G4int( (incidentTotalMomentum  -1.)*5. );          
   if ( iplab > 14) iplab = 15 + G4int(  incidentTotalMomentum  -2.     );
   if ( iplab > 22) iplab = 23 + G4int( (incidentTotalMomentum -10.)/10.); 
                    iplab = std::min(24, iplab);

   if ( G4UniformRand() > anhl[iplab] )
     {                                           // non- annihilation channels

                         //  number of total particles vs. centre of mass Energy - 2*proton mass
   
           G4double aleab = std::log(availableEnergy);
           G4double n     = 3.62567+aleab*(0.665843+aleab*(0.336514
                            + aleab*(0.117712+0.0136912*aleab))) - 2.0;
   
                         // normalization constant for kno-distribution.
                         // calculate first the sum of all constants, check for numerical problems.   
           G4double test, dum, anpn = 0.0;

           for (nt=1; nt<=numSec; nt++) {
             test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) );
             dum = pi*nt/(2.0*n*n);
             if (std::fabs(dum) < 1.0) { 
               if( test >= 1.0e-10 )anpn += dum*test;
             } else { 
               anpn += dum*test;
             }
           }
   
           G4double ran = G4UniformRand();
           G4double excs = 0.0;
           if( targetCode == protonCode ) 
             {
               counter = -1;
               for( npos=0; npos<numSec/3; npos++ ) 
                  {
                    for( nneg=std::max(0,npos-2); nneg<=(npos+1); nneg++ ) 
                       {
                         for( nzero=0; nzero<numSec/3; nzero++ ) 
                            {
                              if( ++counter < numMul ) 
                                {
                                  nt = npos+nneg+nzero;
                                  if ( (nt>0) && (nt<=numSec) ) {
                                    test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) );
                                    dum = (pi/anpn)*nt*protmul[counter]*protnorm[nt-1]/(2.0*n*n);
                                    if (std::fabs(dum) < 1.0) { 
                                      if( test >= 1.0e-10 )excs += dum*test;
                                    } else { 
                                      excs += dum*test;
                                    }

                                    if (ran < excs) goto outOfLoop;      //----------------------->
                                  }   
                                }    
                            }     
                       }                                                                                  
                  }
       
                                // 3 previous loops continued to the end
               inElastic = false;         // quasi-elastic scattering   
               return;
             }
           else   
             {                                         // target must be a neutron
               counter = -1;
               for( npos=0; npos<numSec/3; npos++ ) 
                  {
                    for( nneg=std::max(0,npos-1); nneg<=(npos+2); nneg++ ) 
                       {
                         for( nzero=0; nzero<numSec/3; nzero++ ) 
                            {
                              if( ++counter < numMul ) 
                                {
                                  nt = npos+nneg+nzero;
                                  if ( (nt>0) && (nt<=numSec) ) {
                                    test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) );
                                    dum = (pi/anpn)*nt*neutmul[counter]*neutnorm[nt-1]/(2.0*n*n);
                                    if (std::fabs(dum) < 1.0) { 
                                      if( test >= 1.0e-10 )excs += dum*test;
                                    } else { 
                                      excs += dum*test;
                                    }

                                    if (ran < excs) goto outOfLoop;       // -------------------------->
                                  }
                                }
                            }
                       }
                  }
                                                      // 3 previous loops continued to the end
               inElastic = false;                     // quasi-elastic scattering.
               return;
             }
          
       outOfLoop:           //  <------------------------------------------------------------------------   
    
       ran = G4UniformRand();

       if( targetCode == protonCode)
         {
           if( npos == nneg)
             {
               if (ran < 0.40)
                 {
                 }
               else if (ran < 0.8)
                 {
                   pv[0] = AntiSigmaZero;
                 }
               else
                 {
                   pv[0] = AntiSigmaMinus;
                   pv[1] = Neutron;
                 } 
             }
           else if (npos == (nneg+1))
             {
               if( ran < 0.25)
                 {
                   pv[1] = Neutron;
                 }
               else if (ran < 0.5)
                 {
                   pv[0] = AntiSigmaZero;
                   pv[1] = Neutron;
                 }
               else
                 {
                   pv[0] = AntiSigmaPlus;
                 }
             }
           else if (npos == (nneg-1))
             {  
               pv[0] = AntiSigmaMinus;
             }
           else      
             {
               pv[0] = AntiSigmaPlus;
               pv[1] = Neutron;
             } 
         }  
       else
         {
           if( npos == nneg)
             {
               if (ran < 0.4)
                 {
                 }
               else if(ran < 0.8)
                 {
                   pv[0] = AntiSigmaZero;
                 }
               else
                 {
                   pv[0] = AntiSigmaPlus;
                   pv[1] = Proton;
                 }
             } 
           else if ( npos == (nneg-1))
             {
               if (ran < 0.5)
                 {
                   pv[0] = AntiSigmaMinus;
                 }
               else if (ran < 0.75)
                 {
                   pv[1] = Proton;
                 }
               else
                 {
                   pv[0] = AntiSigmaZero;
                   pv[1] = Proton;
                 } 
             }
           else if (npos == (nneg+1))
             {
               pv[0] = AntiSigmaPlus;
             }
           else 
             {
               pv[0] = AntiSigmaMinus;
               pv[1] = Proton;
             }
         }      
     
     }
   else                                                               // annihilation
     {  
       if ( availableEnergy > 2. * PionPlus.getMass() )
         {

           G4double aleab = std::log(availableEnergy);
           G4double n     = 3.62567+aleab*(0.665843+aleab*(0.336514
                            + aleab*(0.117712+0.0136912*aleab))) - 2.0;
   
                      //   normalization constant for kno-distribution.
                      //   calculate first the sum of all constants, check for numerical problems.   
           G4double test, dum, anpn = 0.0;

           for (nt=2; nt<=numSec; nt++) {
             test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) );
             dum = pi*nt/(2.0*n*n);
             if (std::fabs(dum) < 1.0) { 
               if( test >= 1.0e-10 )anpn += dum*test;
             } else { 
               anpn += dum*test;
             }
           }
   
           G4double ran = G4UniformRand();
           G4double excs = 0.0;
           if( targetCode == protonCode ) 
             {
               counter = -1;
               for( npos=1; npos<numSec/3; npos++ ) 
                  {
                    nneg = npos-1; 
                    for( nzero=0; nzero<numSec/3; nzero++ ) 
                      {
                        if( ++counter < numMulAn ) 
                          {
                            nt = npos+nneg+nzero;
                            if ( (nt>1) && (nt<=numSec) ) {
                              test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) );
                              dum = (pi/anpn)*nt*protmulAn[counter]*protnormAn[nt-1]/(2.0*n*n);
                              if (std::fabs(dum) < 1.0) { 
                                if( test >= 1.0e-10 )excs += dum*test;
                              } else { 
                                excs += dum*test;
                              }

                              if (ran < excs) goto outOfLoopAn;      //----------------------->
                            }   
                          }    
                      }     
                 }                                                                                  
                                      // 3 previous loops continued to the end
               inElastic = false;            // quasi-elastic scattering   
               return;
             }
           else   
             {                                // target must be a neutron
               counter = -1;
               for( npos=0; npos<numSec/3; npos++ ) 
                 { 
                   nneg = npos; 
                   for( nzero=0; nzero<numSec/3; nzero++ ) 
                      {
                        if( ++counter < numMulAn ) 
                          {
                            nt = npos+nneg+nzero;
                            if ( (nt>1) && (nt<=numSec) ) {
                              test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) );
                              dum = (pi/anpn)*nt*neutmulAn[counter]*neutnormAn[nt-1]/(2.0*n*n);
                              if (std::fabs(dum) < 1.0) { 
                                if( test >= 1.0e-10 )excs += dum*test;
                              } else { 
                                excs += dum*test;
                              }
                              if (ran < excs) goto outOfLoopAn;       // -------------------------->
                            }
                          }
                      }
                 }
               inElastic = false;                     // quasi-elastic scattering.
               return;
             }
       outOfLoopAn:           //  <------------------------------------------------------------------   
       vecLen = 0;
         }
     }

   nt = npos + nneg + nzero;
   while ( nt > 0)
       {
         G4double ran = G4UniformRand();
         if ( ran < (G4double)npos/nt)
            { 
              if( npos > 0 ) 
                { pv[vecLen++] = PionPlus;
                  npos--;
                }
            }
         else if ( ran < (G4double)(npos+nneg)/nt)
            {   
              if( nneg > 0 )
                { 
                  pv[vecLen++] = PionMinus;
                  nneg--;
                }
            }
         else
            {
              if( nzero > 0 )
                { 
                  pv[vecLen++] = PionZero;
                  nzero--;
                }
            }
         nt = npos + nneg + nzero;
       } 
   if (verboseLevel > 1)
      {
        G4cout << "Particles produced: " ;
        G4cout << pv[0].getCode() << " " ;
        G4cout << pv[1].getCode() << " " ;
        for (i=2; i < vecLen; i++)   
            { 
              G4cout << pv[i].getCode() << " " ;
            }
         G4cout << G4endl;
      }
   return;
 }

---