G4DecayTable.cc

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//
// G4DecayTable class implementation
//
// Author: H.Kurashige, 7 July 1996
// --------------------------------------------------------------------
 
#include "globals.hh"
#include "G4DecayTable.hh"
#include "Randomize.hh"
 
G4DecayTable::G4DecayTable()
{
  channels =  new G4VDecayChannelVector;
}
 
G4DecayTable::~G4DecayTable()
{
  // remove and delete all contents  
  for (auto iCh = channels->cbegin(); iCh!= channels->cend(); ++iCh)
  {
    delete (*iCh);
  }
  channels->clear();
  delete  channels;
  channels = nullptr;
  parent = nullptr;
}    
 
void G4DecayTable::Insert(G4VDecayChannel* aChannel)
{
  if (parent == nullptr)
  { 
    parent = (G4ParticleDefinition*)(aChannel->GetParent()); 
  }
  if (parent != aChannel->GetParent())
  {
#ifdef G4VERBOSE
    G4cout << " G4DecayTable::Insert :: bad G4VDecayChannel (mismatch parent) "
           << "       " << parent->GetParticleName()
           << " input:" << aChannel->GetParent()->GetParticleName() << G4endl;
#endif
  }
  else
  {
    G4double br = aChannel->GetBR();
    for (auto iCh = channels->cbegin(); iCh!= channels->cend(); ++iCh)
    {
      if (br > (*iCh)->GetBR())
      {
        channels->insert(iCh,aChannel);
        return;
      }
    }
    channels->push_back(aChannel);
  }
}
 
G4VDecayChannel* G4DecayTable::SelectADecayChannel(G4double parentMass)
{
  // check if contents exist
  if (channels->size()<1) return nullptr;
 
  if(parentMass < 0.) parentMass=parent->GetPDGMass(); 
 
  G4double sumBR = 0.;
  for (auto iCh = channels->cbegin(); iCh!= channels->cend(); ++iCh)
  {
    if ( !((*iCh)->IsOKWithParentMass(parentMass)) ) continue;
    sumBR += (*iCh)->GetBR();
  }
  if (sumBR <= 0.0)
  {
#ifdef G4VERBOSE
    G4cout << " G4DecayTable::SelectADecayChannel :: no possible DecayChannel"
           << "       " << parent->GetParticleName() << G4endl;
#endif
    return nullptr;
  }
 
  const std::size_t MAX_LOOP = 10000;
  for (std::size_t loop_counter=0; loop_counter<MAX_LOOP; ++loop_counter)
  {
    G4double sum = 0.0;
    G4double br= sumBR*G4UniformRand();
    // select decay channel
    for (auto iCh = channels->cbegin(); iCh!= channels->cend(); ++iCh)
    {
      sum += (*iCh)->GetBR();
      if ( !((*iCh)->IsOKWithParentMass(parentMass)) ) continue;
      if (br < sum) return (*iCh);
    }
  }
  return nullptr;
}
 
void G4DecayTable::DumpInfo() const
{
  G4cout << "G4DecayTable:  " << parent->GetParticleName() << G4endl;
  G4int index =0;
  for (auto iCh = channels->cbegin(); iCh!= channels->cend(); ++iCh)
  {
    G4cout << index << ": ";
    (*iCh)->DumpInfo();
    index += 1;
  }
  G4cout << G4endl;
}