It visits the event record & computes a Fermi motion momentum for initial state nucleons bound in nuclei. Is a concrete implementation of the EventRecordVisitorI interface. More...

#include <FermiMover.h>

Inheritance diagram for genie::FermiMover:

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Collaboration diagram for genie::FermiMover:

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Public Member Functions
	FermiMover ()

	FermiMover (string config)

	~FermiMover ()

void	ProcessEventRecord (GHepRecord *event_rec) const

void	Configure (const Registry &config)

void	Configure (string config)

Public Member Functions inherited from genie::EventRecordVisitorI
virtual	~EventRecordVisitorI ()

Public Member Functions inherited from genie::Algorithm
virtual	~Algorithm ()

virtual void	FindConfig (void)

virtual const Registry &	GetConfig (void) const

Registry *	GetOwnedConfig (void)

virtual const AlgId &	Id (void) const
	Get algorithm ID. More...

virtual AlgStatus_t	GetStatus (void) const
	Get algorithm status. More...

virtual bool	AllowReconfig (void) const

virtual AlgCmp_t	Compare (const Algorithm *alg) const
	Compare with input algorithm. More...

virtual void	SetId (const AlgId &id)
	Set algorithm ID. More...

virtual void	SetId (string name, string config)

const Algorithm *	SubAlg (const RgKey &registry_key) const

void	AdoptConfig (void)

void	AdoptSubstructure (void)

virtual void	Print (ostream &stream) const
	Print algorithm info. More...

Private Member Functions
void	KickHitNucleon (GHepRecord *evrec) const
	give hit nucleon a momentum More...

void	AddTargetNucleusRemnant (GHepRecord *evrec) const
	add a recoiled nucleus remnant More...

void	LoadConfig (void)

Private Attributes
bool	fKeepNuclOnMassShell
	keep hit bound nucleon on the mass shell? More...

bool	fMomDepErmv
	use momentum dependent calculation of Ermv More...

const NuclearModelI *	fNuclModel
	nuclear model More...

const SecondNucleonEmissionI *	fSecondEmitter

Additional Inherited Members
Static Public Member Functions inherited from genie::Algorithm
static string	BuildParamVectKey (const std::string &comm_name, unsigned int i)

static string	BuildParamVectSizeKey (const std::string &comm_name)

static string	BuildParamMatKey (const std::string &comm_name, unsigned int i, unsigned int j)

static string	BuildParamMatRowSizeKey (const std::string &comm_name)

static string	BuildParamMatColSizeKey (const std::string &comm_name)

Protected Member Functions inherited from genie::EventRecordVisitorI
	EventRecordVisitorI ()

	EventRecordVisitorI (string name)

	EventRecordVisitorI (string name, string config)

Protected Member Functions inherited from genie::Algorithm
	Algorithm ()

	Algorithm (string name)

	Algorithm (string name, string config)

void	Initialize (void)

void	DeleteConfig (void)

void	DeleteSubstructure (void)

Registry *	ExtractLocalConfig (const Registry &in) const

Registry *	ExtractLowerConfig (const Registry &in, const string &alg_key) const
	Split an incoming configuration Registry into a block valid for the sub-algo identified by alg_key. More...

template<class T >
bool	GetParam (const RgKey &name, T &p, bool is_top_call=true) const

template<class T >
bool	GetParamDef (const RgKey &name, T &p, const T &def) const

template<class T >
int	GetParamVect (const std::string &comm_name, std::vector< T > &v, bool is_top_call=true) const
	Handle to load vectors of parameters. More...

int	GetParamVectKeys (const std::string &comm_name, std::vector< RgKey > &k, bool is_top_call=true) const

template<class T >
int	GetParamMat (const std::string &comm_name, TMatrixT< T > &mat, bool is_top_call=true) const
	Handle to load matrix of parameters. More...

template<class T >
int	GetParamMatSym (const std::string &comm_name, TMatrixTSym< T > &mat, bool is_top_call=true) const

int	GetParamMatKeys (const std::string &comm_name, std::vector< RgKey > &k, bool is_top_call=true) const

int	AddTopRegistry (Registry *rp, bool owns=true)
	add registry with top priority, also update ownership More...

int	AddLowRegistry (Registry *rp, bool owns=true)
	add registry with lowest priority, also update ownership More...

int	MergeTopRegistry (const Registry &r)

int	AddTopRegisties (const vector< Registry * > &rs, bool owns=false)
	Add registries with top priority, also udated Ownerships. More...

Protected Attributes inherited from genie::Algorithm
bool	fAllowReconfig

bool	fOwnsSubstruc
	true if it owns its substructure (sub-algs,...) More...

AlgId	fID
	algorithm name and configuration set More...

vector< Registry * >	fConfVect

vector< bool >	fOwnerships
	ownership for every registry in fConfVect More...

AlgStatus_t	fStatus
	algorithm execution status More...

AlgMap *	fOwnedSubAlgMp
	local pool for owned sub-algs (taken out of the factory pool) More...

Detailed Description

It visits the event record & computes a Fermi motion momentum for initial state nucleons bound in nuclei. Is a concrete implementation of the EventRecordVisitorI interface.

Author: Costas Andreopoulos <c.andreopoulos cern.ch> University of Liverpool

Created:: October 08, 2004

License:: Copyright (c) 2003-2024, The GENIE Collaboration For the full text of the license visit http://copyright.genie-mc.org

Definition at line 35 of file FermiMover.h.

Constructor & Destructor Documentation

FermiMover::FermiMover ( )

Definition at line 65 of file FermiMover.cxx.

                        :
 EventRecordVisitorI("genie::FermiMover")
 {
 
 }

FermiMover::FermiMover ( string config )

Definition at line 71 of file FermiMover.cxx.

                                     :
 EventRecordVisitorI("genie::FermiMover", config)
 {
 
 }

FermiMover::~FermiMover ( )

Definition at line 77 of file FermiMover.cxx.

 {
 
 }

Member Function Documentation

void FermiMover::AddTargetNucleusRemnant ( GHepRecord * evrec ) const

private

add a recoiled nucleus remnant

Definition at line 224 of file FermiMover.cxx.

Referenced by ProcessEventRecord().

 {
 // add the remnant nuclear target at the GHEP record
 
   LOG("FermiMover", pINFO) << "Adding final state nucleus";
 
   double Px = 0;
   double Py = 0;
   double Pz = 0;
   double E  = 0;
 
   GHepParticle * nucleus = evrec->TargetNucleus();
   int A = nucleus->A();
   int Z = nucleus->Z();
 
   int fd = nucleus->FirstDaughter();
   int ld = nucleus->LastDaughter();
 
   for(int id = fd; id <= ld; id++) {
 
     // compute A,Z for final state nucleus & get its PDG code and its mass
     GHepParticle * particle = evrec->Particle(id);
     assert(particle);
     int  pdgc = particle->Pdg();
     bool is_p  = pdg::IsProton (pdgc);
     bool is_n  = pdg::IsNeutron(pdgc);
 
     if (is_p) Z--;
     if (is_p || is_n) A--;
 
     Px += particle->Px();
     Py += particle->Py();
     Pz += particle->Pz();
     E  += particle->E();
 
   }//daughters
 
   TParticlePDG * remn = 0;
   int ipdgc = pdg::IonPdgCode(A, Z);
   remn = PDGLibrary::Instance()->Find(ipdgc);
   if(!remn) {
     LOG("HadronicVtx", pFATAL)
           << "No particle with [A = " << A << ", Z = " << Z
                             << ", pdgc = " << ipdgc << "] in PDGLibrary!";
     assert(remn);
   }
 
   double Mi = nucleus->Mass();
   Px *= -1;
   Py *= -1;
   Pz *= -1;
   E = Mi-E;
 
   // Add the nucleus to the event record
   LOG("FermiMover", pINFO)
      << "Adding nucleus [A = " << A << ", Z = " << Z
      << ", pdgc = " << ipdgc << "]";
 
   int imom = evrec->TargetNucleusPosition();
   evrec->AddParticle(
        ipdgc,kIStStableFinalState, imom,-1,-1,-1, Px,Py,Pz,E, 0,0,0,0);
 }

void FermiMover::Configure ( const Registry & config )

virtual

Configure the algorithm with an external registry The registry is merged with the top level registry if it is owned, Otherwise a copy of it is added with the highest priority

Reimplemented from genie::Algorithm.

Definition at line 287 of file FermiMover.cxx.

References genie::Algorithm::Configure(), and LoadConfig().

 {
   Algorithm::Configure(config);
   this->LoadConfig();
 }

void FermiMover::Configure ( string config )

virtual

Configure the algorithm from the AlgoConfigPool based on param_set string given in input An algorithm contains a vector of registries coming from different xml configuration files, which are loaded according a very precise prioriy This methods will load a number registries in order of priority: 1) "Tunable" parameter set from CommonParametes. This is loaded with the highest prioriry and it is designed to be used for tuning procedure Usage not expected from the user. 2) For every string defined in "CommonParame" the corresponding parameter set will be loaded from CommonParameter.xml 3) parameter set specified by the config string and defined in the xml file of the algorithm 4) if config is not "Default" also the Default parameter set from the same xml file will be loaded Effectively this avoids the repetion of a parameter when it is not changed in the requested configuration

Reimplemented from genie::Algorithm.

Definition at line 293 of file FermiMover.cxx.

References genie::Algorithm::Configure(), and LoadConfig().

 {
   Algorithm::Configure(config);
   this->LoadConfig();
 }

void FermiMover::KickHitNucleon ( GHepRecord * evrec ) const

private

give hit nucleon a momentum

Definition at line 100 of file FermiMover.cxx.

References genie::units::A, genie::GHepParticle::A(), genie::GHepRecord::EventFlags(), genie::PDGLibrary::Find(), fKeepNuclOnMassShell, fMomDepErmv, fNuclModel, genie::NuclearModelI::GenerateNucleon(), genie::NuclearModelI::GetFermiMoverInteractionType(), genie::GHepRecord::HitNucleon(), genie::Target::HitNucP4Ptr(), genie::PDGLibrary::Instance(), genie::pdg::IonPdgCode(), genie::KPhaseSpace::IsAboveThreshold(), genie::Target::IsNucleus(), genie::pdg::IsProton(), genie::kBelowThrNRF, genie::kFermiMoveEffectiveSF1p1h, genie::kFermiMoveEffectiveSF2p2h_eject, genie::kFermiMoveEffectiveSF2p2h_noeject, genie::kPdgNeutron, genie::kPdgProton, genie::kRfHitNucRest, LOG, genie::utils::res::Mass(), genie::GHepParticle::Mass(), genie::NuclearModelI::Momentum3(), genie::GHepParticle::Pdg(), pFATAL, genie::Interaction::PhaseSpace(), pINFO, pNOTICE, genie::InitialState::ProbeE(), genie::units::rad, genie::NuclearModelI::RemovalEnergy(), genie::GHepParticle::SetMomentum(), genie::exceptions::EVGThreadException::SetReason(), genie::GHepParticle::SetRemovalEnergy(), genie::exceptions::EVGThreadException::SwitchOnFastForward(), genie::GHepRecord::TargetNucleus(), genie::KPhaseSpace::Threshold(), genie::GHepParticle::X4(), and genie::GHepParticle::Z().

Referenced by ProcessEventRecord().

 {
   Interaction *  interaction = evrec       -> Summary();
   InitialState * init_state  = interaction -> InitStatePtr();
   Target *       tgt         = init_state  -> TgtPtr();
 
   // do nothing for non-nuclear targets
   if(!tgt->IsNucleus()) return;
 
   TLorentzVector * p4 = tgt->HitNucP4Ptr();
 
   // do nothing if the struct nucleon 4-momentum was set (eg as part of the
   // initial state selection)
   if(p4->Px()>0 || p4->Py()>0 || p4->Pz()>0) return;
 
   // access the hit nucleon and target nucleus at the GHEP record
   GHepParticle * nucleon = evrec->HitNucleon();
   GHepParticle * nucleus = evrec->TargetNucleus();
   assert(nucleon);
   assert(nucleus);
 
   // generate a Fermi momentum & removal energy
   // call GenerateNucleon with a radius in case the model is LocalFGM
   double rad = nucleon->X4()->Vect().Mag();
   fNuclModel->GenerateNucleon(*tgt,rad);
 
   TVector3 p3 = fNuclModel->Momentum3();
   double w    = fNuclModel->RemovalEnergy();
 
   LOG("FermiMover", pINFO)
      << "Generated nucleon momentum: ("
      << p3.Px() << ", " << p3.Py() << ", " << p3.Pz() << "), "
      << "|p| = " << p3.Mag();
   LOG("FermiMover", pINFO)
      << "Generated nucleon removal energy: w = " << w;
 
   double pF2 = p3.Mag2(); // (fermi momentum)^2
 
   nucleon->SetRemovalEnergy(w);
 
   // struck nucleon energy:
   // two possible prescriptions depending on whether you want to force
   // the sruck nucleon to be on the mass-shell or not...
 
   double EN=0;
   FermiMoverInteractionType_t interaction_type = fNuclModel->GetFermiMoverInteractionType();
 
   // EffectiveSF treatment or momentum-dependent removal energy
   if (interaction_type == kFermiMoveEffectiveSF1p1h || fMomDepErmv ) {
     EN = nucleon->Mass() - w - pF2 / (2 * (nucleus->Mass() - nucleon->Mass()));
   } else if (interaction_type == kFermiMoveEffectiveSF2p2h_eject ||
              interaction_type == kFermiMoveEffectiveSF2p2h_noeject) {
 
                 int other_nucleon_pdg = nucleon->Pdg() == kPdgProton ? kPdgNeutron : kPdgProton ;
                 TParticlePDG * other_nucleon = PDGLibrary::Instance()->Find( other_nucleon_pdg );
 
     TParticlePDG * deuteron = PDGLibrary::Instance()->Find(1000010020);
     EN = deuteron->Mass() - 2 * w - TMath::Sqrt(pF2 + other_nucleon->Mass() * other_nucleon->Mass());
 
   // Do default Fermi Moving
   } else  {
     if (!fKeepNuclOnMassShell) {
       //-- compute A,Z for final state nucleus & get its PDG code
       int nucleon_pdgc = nucleon->Pdg();
       bool is_p  = pdg::IsProton(nucleon_pdgc);
       int Z = (is_p) ? nucleus->Z()-1 : nucleus->Z();
       int A = nucleus->A() - 1;
 
       TParticlePDG * fnucleus = 0;
       int ipdgc = pdg::IonPdgCode(A, Z);
       fnucleus = PDGLibrary::Instance()->Find(ipdgc);
       if(!fnucleus) {
         LOG("FermiMover", pFATAL)
               << "No particle with [A = " << A << ", Z = " << Z
               << ", pdgc = " << ipdgc << "] in PDGLibrary!";
         exit(1);
       }
       //-- compute the energy of the struck (off the mass-shell) nucleus
 
       double Mf  = fnucleus -> Mass(); // remnant nucleus mass
       double Mi  = nucleus  -> Mass(); // initial nucleus mass
 
       EN = Mi - TMath::Sqrt(pF2 + Mf*Mf);
     } else {
       double MN  = nucleon->Mass();
       double MN2 = TMath::Power(MN,2);
       EN = TMath::Sqrt(MN2+pF2);
     }
 
   }
 
   //-- update the struck nucleon 4p at the interaction summary and at
   //   the GHEP record
   p4->SetPx( p3.Px() );
   p4->SetPy( p3.Py() );
   p4->SetPz( p3.Pz() );
   p4->SetE ( EN      );
 
   nucleon->SetMomentum(*p4); // update GHEP value
 
   // Sometimes, for interactions near threshold, Fermi momentum might bring
   // the neutrino energy in the nucleon rest frame below threshold (for the
   // selected interaction). In this case mark the event as unphysical and
   // abort the current thread.
   const KPhaseSpace & kps = interaction->PhaseSpace();
   if(!kps.IsAboveThreshold()) {
      LOG("FermiMover", pNOTICE)
                   << "Event below threshold after generating Fermi momentum";
 
      double Ethr = kps.Threshold();
      double Ev   = init_state->ProbeE(kRfHitNucRest);
      LOG("FermiMover", pNOTICE)
               << "Ev (@ nucleon rest frame) = " << Ev << ", Ethr = " << Ethr;
 
      evrec->EventFlags()->SetBitNumber(kBelowThrNRF, true);
      genie::exceptions::EVGThreadException exception;
      exception.SetReason("E < Ethr after generating nucleon Fermi momentum");
      exception.SwitchOnFastForward();
      throw exception;
   }
 
 
 }

void FermiMover::LoadConfig ( void )

private

Definition at line 299 of file FermiMover.cxx.

References fKeepNuclOnMassShell, fMomDepErmv, fNuclModel, fSecondEmitter, genie::Algorithm::GetParamDef(), and genie::Algorithm::SubAlg().

Referenced by Configure().

 {
   RgKey nuclkey = "NuclearModel";
   fNuclModel = 0;
   fNuclModel = dynamic_cast<const NuclearModelI *> (this->SubAlg(nuclkey));
   assert(fNuclModel);
 
   this->GetParamDef("KeepHitNuclOnMassShell", fKeepNuclOnMassShell, false);
 
   bool mom_dep_energy_removal_def = false;
   this->GetParamDef("LFG-MomentumDependentErmv", mom_dep_energy_removal_def, false ) ;
   // it defaults to whatever the nuclear model sets. Since only the LFG has this option
   // this simple search is enough.
 
   this->GetParamDef("MomentumDependentErmv", fMomDepErmv, mom_dep_energy_removal_def);
 
   RgKey nuclearrecoilkey = "SecondNucleonEmitter" ;
   fSecondEmitter = dynamic_cast<const SecondNucleonEmissionI *> (this->SubAlg(nuclearrecoilkey));
   
   assert(fSecondEmitter);
 
 }

void FermiMover::ProcessEventRecord ( GHepRecord * event_rec ) const

virtual

Implements genie::EventRecordVisitorI.

Definition at line 82 of file FermiMover.cxx.

References AddTargetNucleusRemnant(), fSecondEmitter, genie::GHepRecord::HitNucleon(), genie::Interaction::InitState(), genie::Target::IsNucleus(), KickHitNucleon(), genie::GHepRecord::Summary(), and genie::InitialState::Tgt().

 {
   // skip if not a nuclear target
   if(! evrec->Summary()->InitState().Tgt().IsNucleus()) return;
 
   // skip if no hit nucleon is set
   if(! evrec->HitNucleon()) return;
 
   // give hit nucleon a Fermi momentum
   this->KickHitNucleon(evrec);
 
   // handle the addition of the recoil nucleon
   if ( fSecondEmitter ) fSecondEmitter -> ProcessEventRecord( evrec ) ;
 
   // add a recoiled nucleus remnant
   this->AddTargetNucleusRemnant(evrec);
 }