Generates nuclear de-excitation gamma rays. More...

#include <NucDeExcitationSim.h>

Inheritance diagram for genie::NucDeExcitationSim:

Collaboration diagram for genie::NucDeExcitationSim:

Public Member Functions
	NucDeExcitationSim ()

	NucDeExcitationSim (string config)

	~NucDeExcitationSim ()

void	Configure (const Registry &config) override

void	Configure (std::string config) override

void	ProcessEventRecord (GHepRecord *evrec) const override

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

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

virtual void	Configure (string config)

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	OxygenTargetSim (GHepRecord *evrec) const

void	CarbonTargetSim (GHepRecord *evrec) const

void	ArgonTargetSim (GHepRecord *evrec) const

void	AddPhoton (GHepRecord *evrec, double E0, double t) const

double	PhotonEnergySmearing (double E0, double t) const

TLorentzVector	Photon4P (double E) const

void	LoadConfig ()

Private Attributes
bool	fDoCarbon = false

bool	fDoArgon = false

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

Generates nuclear de-excitation gamma rays.

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

References:: 16O: H.Ejiri,Phys.Rev.C48,1442(1993); K.Kobayashi et al., Nucl.Phys.B (proc Suppl) 139 (2005)

Created:: March 05, 2008

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

Definition at line 31 of file NucDeExcitationSim.h.

Constructor & Destructor Documentation

NucDeExcitationSim::NucDeExcitationSim ( )

Definition at line 47 of file NucDeExcitationSim.cxx.

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

NucDeExcitationSim::NucDeExcitationSim ( string config )

Definition at line 53 of file NucDeExcitationSim.cxx.

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

NucDeExcitationSim::~NucDeExcitationSim ( )

Definition at line 59 of file NucDeExcitationSim.cxx.

 {
 
 }

Member Function Documentation

void NucDeExcitationSim::AddPhoton	(	GHepRecord *	evrec,
		double	E0,
		double	t
	)		const

private

Definition at line 486 of file NucDeExcitationSim.cxx.

Referenced by ArgonTargetSim(), CarbonTargetSim(), and OxygenTargetSim().

 {
 // Add a photon at the event record & recoil the remnant nucleus so as to
 // conserve energy/momenta
 //
   double E = (dt>0) ? this->PhotonEnergySmearing(E0, dt) : E0;
 
   LOG("NucDeEx", pNOTICE)
     << "Adding a " << E/units::MeV << " MeV photon from nucl. deexcitation";
 
   GHepParticle * target  = evrec->Particle(1);
   GHepParticle * remnant = 0;
   for(int i = target->FirstDaughter(); i <= target->LastDaughter(); i++) {
     remnant  = evrec->Particle(i);
     if(pdg::IsIon(remnant->Pdg())) break;
   }
 
   TLorentzVector x4(0,0,0,0);
   TLorentzVector p4 = this->Photon4P(E);
   GHepParticle gamma(kPdgGamma, kIStStableFinalState,1,-1,-1,-1, p4, x4);  // note that this assigns the parent of the photon as the initial-state nucleon/nucleus.  (do we want that??)
   evrec->AddParticle(gamma);
 
 
   remnant->SetPx     ( remnant->Px() - p4.Px() );
   remnant->SetPy     ( remnant->Py() - p4.Py() );
   remnant->SetPz     ( remnant->Pz() - p4.Pz() );
   remnant->SetEnergy ( remnant->E()  - p4.E()  );
 }

void NucDeExcitationSim::ArgonTargetSim ( GHepRecord * evrec ) const

private

Definition at line 555 of file NucDeExcitationSim.cxx.

References AddPhoton(), fDoArgon, genie::GHepRecord::HitNucleon(), genie::RandomGen::Instance(), genie::pdg::IsNucleon(), genie::kPdgProton, LOG, genie::GHepParticle::Pdg(), pNOTICE, and genie::RandomGen::RndDec().

Referenced by ProcessEventRecord().

 {
   // If we've disabled argon de-excitations, then this function is a no-op
   if ( !fDoArgon ) return;
 
   LOG( "NucDeEx", pNOTICE ) << "Simulating nuclear de-excitation gamma-rays"
     " for an argon target";
 
   // Load the leading gamma-ray spectra and emission probabilities from prior
   // simulation results
   static bool loaded_hists = false;
   static TH1D* hist_n = nullptr;
   static TH1D* hist_p = nullptr;
   static double prob_gamma_n = 0.;
   static double prob_gamma_p = 0.;
 
   if ( !loaded_hists ) {
     std::string data_file_name = std::string( gSystem->Getenv("GENIE") )
       + "/data/evgen/nucl/marley_argon_sf_lead_gamma_hists.root";
 
     TFile data_file( data_file_name.c_str(), "read" );
 
     TParameter< double >* prob_n = nullptr;
     TParameter< double >* prob_p = nullptr;
 
     data_file.GetObject( "hist_n", hist_n );
     data_file.GetObject( "hist_p", hist_p );
 
     hist_n->SetDirectory( nullptr );
     hist_p->SetDirectory( nullptr );
 
     data_file.GetObject( "prob_gamma_n", prob_n );
     data_file.GetObject( "prob_gamma_p", prob_p );
 
     assert( hist_n && hist_p && prob_n && prob_p );
 
     prob_gamma_n = prob_n->GetVal();
     prob_gamma_p = prob_p->GetVal();
 
     loaded_hists = true;
   }
 
   GHepParticle* hitnuc = evrec->HitNucleon();
   if ( !hitnuc ) return;
 
   // Choose the appropriate gamma-ray distribution based on the struck nucleon
   int hit_nuc_pdg = hitnuc->Pdg();
   if ( !genie::pdg::IsNucleon(hit_nuc_pdg) ) return;
 
   TH1D* lead_gamma_hist = hist_n;
   double gamma_prob = prob_gamma_n;
   if ( hit_nuc_pdg == kPdgProton ) {
     lead_gamma_hist = hist_p;
     gamma_prob = prob_gamma_p;
   }
 
   // Throw a random number to see if this de-excitation event contains at least
   // one gamma-ray. If it doesn't, just return without doing anything.
   RandomGen* rnd = RandomGen::Instance();
   double r_gamma = rnd->RndDec().Rndm();
   if ( r_gamma > gamma_prob ) {
     LOG( "NucDeEx", pNOTICE ) << "No gamma-ray emitted";
     return;
   }
   // If it does, then sample the leading gamma from the pre-saved distribution
   // and add it to the event. Note that the MARLEY histogram is in MeV, so we
   // also convert to GeV here for consistency with GENIE conventions.
   double E_gamma = lead_gamma_hist->GetRandom() / 1e3;
   this->AddPhoton( evrec, E_gamma, -1. );
 
   LOG( "NucDeEx", pNOTICE ) << "Added gamma with energy " << E_gamma << " GeV";
 }

void NucDeExcitationSim::CarbonTargetSim ( GHepRecord * evrec ) const

private

Definition at line 378 of file NucDeExcitationSim.cxx.

References AddPhoton(), fDoCarbon, genie::GHepRecord::HitNucleon(), genie::RandomGen::Instance(), LOG, pNOTICE, and genie::RandomGen::RndDec().

Referenced by ProcessEventRecord().

 {
   // If we've disabled carbon de-excitations, then this function is a no-op
   if ( !fDoCarbon ) return;
 
   LOG("NucDeEx", pNOTICE)
      << "Simulating nuclear de-excitation gamma rays for Carbon target";
 
   GHepParticle * hitnuc = evrec->HitNucleon();
   if(!hitnuc) return;
 
   //  bool p_hole = (hitnuc->Pdg() == kPdgProton);
 
 
 
   double dt   = -1;
 
   RandomGen * rnd = RandomGen::Instance();
 
 
     //
     // * Define all the data required for simulating deexcitations of n-hole states
     //
 
     //std::cout << "Rik simulating n-hole in carbon " << std::endl;
 
     // > probabilities for creating a n-hole in the P1/2, P3/2, S1/2 shells
     // Kamyshkov gives it a different way than the oxygen folks did.
     // A probability for the Pstates combined, and branching fractions for S1/2
     double Pp12 = 0.0; //  0.75/6.0; // 0.25;  // P1/2  Rik says set to zero.
     double Pp32 = 4.0/6.0; // 0.44;  // P3/2
     double Ps12 = 2.00/6.0;  //0.09;  // S1/2
     //>
     double p32Elv = 0.0020;
     //>
     const int ns12 = 8;
     double s12Elv[ns12] = {0.0005, 0.0007, 0.0017, 0.0021, 0.0033, 0.0035, 0.0047, 0.0063};
     //double s12Plv[ns12] = {0.21, 0.295, 0.14, 0.26, 0.14, 0.2, 0.03, 0.03};
     // the above multiply by 0.2
     double s12Plv[ns12] = {0.042, 0.059, 0.028, 0.052, 0.028, 0.04, 0.006, 0.006};
     // the above multiply by 0.2 and by 2/6.
     //double s12Plv[ns12] = {0.0140, 0.01967, 0.0933, 0.01733, 0.00933, 0.0133, 0.0020, 0.0020};
 
 
     //double s12Elv = 0.00703;
     //double s12Plv = 0.222;
 
     // Select one of the P1/2, P3/2 or S1/2
     double rshell = rnd->RndDec().Rndm();
     //
     // >> P1/2 shell
     //
     if(rshell < Pp12) {
       // Rik says this probability is already set to zero for Kamyshkov
         LOG("NucDeEx", pNOTICE)
           << "Hit nucleon left a P1/2 shell n-hole. Remnant is at g.s.";
         return;
     }
     //
     // >> P3/2 shell
     //
     else
     if(rshell < Pp12 + Pp32) {
         LOG("NucDeEx", pNOTICE)
             << "Hit nucleon left a P3/2 shell n-hole";
 
         double myrand  = rnd->RndDec().Rndm();
         if(myrand < 0.2){
           this->AddPhoton(evrec, p32Elv, dt);
           //std::cout << "Rik made p32Elv " << p32Elv << std::endl;
         } else {
           //std::cout << "Rik made none p32" << std::endl;
         }
     }
     //
     // >> S1/2 shell
     //
     else
     if(rshell < Pp12 + Pp32 + Ps12) {
        LOG("NucDeEx", pNOTICE)
             << "Hit nucleon left an S1/2 shell p-hole";
         // Select one of the excited states caused by a S1/2 shell hole
         double rdecmode  = rnd->RndDec().Rndm();
         double prob_sum  = 0.;
         int    sel_state = -1;
         for(int istate=0; istate<ns12; istate++) {
             prob_sum += s12Plv[istate];
             if(rdecmode < prob_sum) {
               sel_state = istate;
               break;
             }
         }
         LOG("NucDeEx", pNOTICE)
             << "Selected S1/2 excited state = " << sel_state;
         if(sel_state >= 0){
           this->AddPhoton(evrec, s12Elv[sel_state], dt);
           //std::cout << "Rik made s12Elv " << s12Elv[sel_state] << std::endl;
         } else {
           //std::cout << "Rik made none s12" << std::endl;
         }
     }
     else {
       //std::cout << "Rik made none at all" << std::endl;
     }
 
 
 }

void NucDeExcitationSim::Configure ( const Registry & config )

overridevirtual

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 628 of file NucDeExcitationSim.cxx.

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

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

void NucDeExcitationSim::Configure ( std::string config )

override

Definition at line 634 of file NucDeExcitationSim.cxx.

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

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

void NucDeExcitationSim::LoadConfig ( void )

private

Definition at line 640 of file NucDeExcitationSim.cxx.

References fDoArgon, fDoCarbon, and genie::Algorithm::GetParamDef().

Referenced by Configure().

 {
   // Boolean flag that enables/disables de-excitation handling for carbon
   GetParamDef( "DoCarbon", fDoCarbon, false );
 
   // Boolean flag that enables/disables de-excitation handling for argon
   GetParamDef( "DoArgon", fDoArgon, false );
 }

void NucDeExcitationSim::OxygenTargetSim ( GHepRecord * evrec ) const

private

Definition at line 126 of file NucDeExcitationSim.cxx.

References AddPhoton(), genie::GHepRecord::HitNucleon(), genie::RandomGen::Instance(), genie::kPdgProton, LOG, genie::GHepParticle::Pdg(), pNOTICE, and genie::RandomGen::RndDec().

Referenced by ProcessEventRecord().

 {
   LOG("NucDeEx", pNOTICE)
      << "Simulating nuclear de-excitation gamma rays for Oxygen target";
 
   //LOG("NucDeEx", pNOTICE) << *evrec;
 
   GHepParticle * hitnuc = evrec->HitNucleon();
   if(!hitnuc) return;
 
   bool p_hole = (hitnuc->Pdg() == kPdgProton);
   double dt   = -1;
 
   RandomGen * rnd = RandomGen::Instance();
 
   //
   // ****** P-Hole
   //
   if (p_hole) {
     //
     // * Define all the data required for simulating deexcitations of p-hole states
     //
 
     // > probabilities for creating a p-hole in the P1/2, P3/2, S1/2 shells
     double Pp12 = 0.25;              // P1/2
     double Pp32 = 0.47;              // P3/2
     double Ps12 = 1. - Pp12 - Pp32;  // S1/2
 
     // > excited state energy levels & probabilities for P3/2-shell p-holes
     const int np32 = 3;
     double p32Elv[np32] = { 0.00632, 0.00993, 0.01070 };
     double p32Plv[np32] = { 0.872,   0.064,   0.064   };
     // - probabilities for deexcitation modes of P3/2-shell p-hole state '1'
     double p32Plv1_1gamma  = 0.78;  // prob to decay via 1 gamma
     double p32Plv1_cascade = 0.22;  // prob to decay via gamma cascade
 
     // > excited state energy levels & probabilities for S1/2-shell p-holes
     const int ns12 = 11;
     double s12Elv[ns12] = {
                0.00309, 0.00368, 0.00385, 0.00444, 0.00492,
                0.00511, 0.00609, 0.00673, 0.00701, 0.00703, 0.00734 };
     double s12Plv[ns12] = {
                0.0625,  0.1875,  0.075,   0.1375,  0.1375,
                0.0125,  0.0125,  0.075,   0.0563,  0.0563,  0.1874  };
     // - gamma energies and probabilities for S1/2-shell p-hole excited
     //   states '2','7' and '10' with >1 deexcitation modes
     const int ns12lv2 = 3;
     double s12Elv2[ns12lv2]    = { 0.00309, 0.00369, 0.00385 };
     double s12Plv2[ns12lv2]    = { 0.013,   0.360,   0.625   };
     const int ns12lv7 = 2;
     double s12Elv7[ns12lv7]    = { 0.00609, 0.00673 };
     double s12Plv7[ns12lv7]    = { 0.04,    0.96    };
     const int ns12lv10 = 3;
     double s12Elv10[ns12lv10]  = { 0.00609, 0.00673, 0.00734 };
     double s12Plv10[ns12lv10]  = { 0.050,   0.033,   0.017   };
 
     // Select one of the P1/2, P3/2 or S1/2
     double rshell = rnd->RndDec().Rndm();
     //
     // >> P1/2 shell
     //
     if(rshell < Pp12) {
         LOG("NucDeEx", pNOTICE)
           << "Hit nucleon left a P1/2 shell p-hole. Remnant is at g.s.";
         return;
     }
     //
     // >> P3/2 shell
     //
     else
     if(rshell < Pp12 + Pp32) {
         LOG("NucDeEx", pNOTICE)
             << "Hit nucleon left a P3/2 shell p-hole";
         // Select one of the excited states
         double rdecmode  = rnd->RndDec().Rndm();
         double prob_sum  = 0;
         int    sel_state = -1;
         for(int istate=0; istate<np32; istate++) {
             prob_sum += p32Plv[istate];
             if(rdecmode < prob_sum) {
               sel_state = istate;
               break;
             }
         }
         LOG("NucDeEx", pNOTICE)
             << "Selected P3/2 excited state = " << sel_state;
 
         // Decay that excited state
         // >> 6.32 MeV state
         if(sel_state==0) {
             this->AddPhoton(evrec, p32Elv[0], dt);
         }
         // >> 9.93 MeV state
         else
         if(sel_state==1) {
             double r = rnd->RndDec().Rndm();
             // >>> emit a single gamma
             if(r < p32Plv1_1gamma) {
                this->AddPhoton(evrec, p32Elv[1], dt);
             }
             // >>> emit a cascade of gammas
             else
             if(r < p32Plv1_1gamma + p32Plv1_cascade) {
                this->AddPhoton(evrec, p32Elv[1],           dt);
                this->AddPhoton(evrec, p32Elv[1]-p32Elv[0], dt);
             }
         }
         // >> 10.7 MeV state
         else
         if(sel_state==2) {
            // Above the particle production threshold - need to emit
            // a 0.5 MeV kinetic energy proton.
            // Will neglect that given that it is a very low energy
            // kinetic energy nucleon and the intranuke break-up nucleon
            // cross sections are already tuned.
            return;
         }
     } //p3/2
     //
     // >> S1/2 shell
     //
     else if (rshell < Pp12 + Pp32 + Ps12) {
         LOG("NucDeEx", pNOTICE)
             << "Hit nucleon left an S1/2 shell p-hole";
         // Select one of the excited states caused by a S1/2 shell hole
         double rdecmode  = rnd->RndDec().Rndm();
         double prob_sum  = 0;
         int    sel_state = -1;
         for(int istate=0; istate<ns12; istate++) {
             prob_sum += s12Plv[istate];
             if(rdecmode < prob_sum) {
               sel_state = istate;
               break;
             }
         }
         LOG("NucDeEx", pNOTICE)
             << "Selected S1/2 excited state = " << sel_state;
 
         // Decay that excited state
         bool multiple_decay_modes =
               (sel_state==2 || sel_state==7 || sel_state==10);
         if(!multiple_decay_modes) {
           this->AddPhoton(evrec, s12Elv[sel_state], dt);
         } else {
           int ndec = -1;
           double * pdec = 0, * edec = 0;
           switch(sel_state) {
            case(2) :
               ndec = ns12lv2;  pdec = s12Plv2;  edec = s12Elv2;
               break;
            case(7) :
               ndec = ns12lv7;  pdec = s12Plv7;  edec = s12Elv7;
               break;
            case(10) :
               ndec = ns12lv10; pdec = s12Plv10; edec = s12Elv10;
               break;
            default:
              return;
           }
           double r = rnd->RndDec().Rndm();
           double decmode_prob_sum = 0;
           int sel_decmode = -1;
           for(int idecmode=0; idecmode < ndec; idecmode++) {
              decmode_prob_sum += pdec[idecmode];
              if(r < decmode_prob_sum) {
                  sel_decmode = idecmode;
                  break;
              }
           }
           if(sel_decmode == -1) return;
           this->AddPhoton(evrec, edec[sel_decmode], dt);
         }//mult.dec.ch
 
     } // s1/2
     else {
     }
   } // p-hole
 
   //
   // ****** n-hole
   //
   else {
     //
     // * Define all the data required for simulating deexcitations of n-hole states
     //
 
     // > probabilities for creating a n-hole in the P1/2, P3/2, S1/2 shells
     double Pp12 = 0.25;  // P1/2
     double Pp32 = 0.44;  // P3/2
     double Ps12 = 0.09;  // S1/2
     //>
     double p32Elv = 0.00618;
     //>
     double s12Elv = 0.00703;
     double s12Plv = 0.222;
 
     // Select one of the P1/2, P3/2 or S1/2
     double rshell = rnd->RndDec().Rndm();
     //
     // >> P1/2 shell
     //
     if(rshell < Pp12) {
         LOG("NucDeEx", pNOTICE)
           << "Hit nucleon left a P1/2 shell n-hole. Remnant is at g.s.";
         return;
     }
     //
     // >> P3/2 shell
     //
     else
     if(rshell < Pp12 + Pp32) {
         LOG("NucDeEx", pNOTICE)
             << "Hit nucleon left a P3/2 shell n-hole";
         this->AddPhoton(evrec, p32Elv, dt);
     }
     //
     // >> S1/2 shell
     //
     else
     if(rshell < Pp12 + Pp32 + Ps12) {
         LOG("NucDeEx", pNOTICE)
             << "Hit nucleon left a S1/2 shell n-hole";
         // only one of the deexcitation modes involve a (7.03 MeV) photon
         double r = rnd->RndDec().Rndm();
         if(r < s12Plv) this->AddPhoton(evrec, s12Elv,dt);
     }
     else {
     }
   } //n-hole
 }

TLorentzVector NucDeExcitationSim::Photon4P ( double E ) const

private

Definition at line 533 of file NucDeExcitationSim.cxx.

References genie::RandomGen::Instance(), genie::constants::kPi, and genie::RandomGen::RndDec().

Referenced by AddPhoton().

 {
 // Generate a photon 4p
 
   RandomGen * rnd = RandomGen::Instance();
 
   double costheta = -1. + 2. * rnd->RndDec().Rndm();
   double sintheta = TMath::Sqrt(TMath::Max(0., 1.-TMath::Power(costheta,2)));
   double phi      = 2*kPi * rnd->RndDec().Rndm();
   double cosphi   = TMath::Cos(phi);
   double sinphi   = TMath::Sin(phi);
 
   double px = E * sintheta * cosphi;
   double py = E * sintheta * sinphi;
   double pz = E * costheta;
 
   TLorentzVector p4(px,py,pz,E);
   return p4;
 }

double NucDeExcitationSim::PhotonEnergySmearing	(	double	E0,
		double	t
	)		const

private

Definition at line 516 of file NucDeExcitationSim.cxx.

References genie::RandomGen::Instance(), genie::constants::kPlankConstant, LOG, pNOTICE, genie::RandomGen::RndDec(), and genie::units::s.

Referenced by AddPhoton().

 {
 // Returns the smeared energy of the emitted gamma
 // E0 : energy of the excited state (GeV)
 // dt: excited state lifetime (sec)
 //
   double dE = kPlankConstant / (dt*units::s);
 
   RandomGen * rnd = RandomGen::Instance();
   double E = rnd->RndDec().Gaus(E0 /*mean*/, dE /*sigma*/);
 
   LOG("NucDeEx", pNOTICE)
      << "<E> = " << E0 << ", dE = " << dE << " -> E = " << E;
 
   return E;
 }

void NucDeExcitationSim::ProcessEventRecord ( GHepRecord * evrec ) const

overridevirtual

Implements genie::EventRecordVisitorI.

Definition at line 64 of file NucDeExcitationSim.cxx.

References ArgonTargetSim(), CarbonTargetSim(), genie::RandomGen::Instance(), genie::ProcessInfo::IsDeepInelastic(), genie::ProcessInfo::IsMEC(), genie::ProcessInfo::IsQuasiElastic(), genie::ProcessInfo::IsResonant(), LOG, OxygenTargetSim(), pINFO, pNOTICE, genie::Interaction::ProcInfo(), genie::RandomGen::RndDec(), genie::GHepRecord::Summary(), genie::GHepRecord::TargetNucleus(), and genie::GHepParticle::Z().

 {
   LOG("NucDeEx", pNOTICE)
      << "Simulating nuclear de-excitation gamma rays";
 
   GHepParticle * nucltgt = evrec->TargetNucleus();
   if (!nucltgt) {
     LOG("NucDeEx", pINFO)
       << "No nuclear target found - Won't simulate nuclear de-excitation";
     return;
   }
 
   if(nucltgt->Z()==8) this->OxygenTargetSim(evrec);
 
   // if oxygen, keep the existing genie behavior
 
   // if not oxygen, only simulate these for QE events
   // double nucleon knockout produces fewer photons.
   // too much energy and it all leaves as nucleon ejection.
   // either set them to zero, or set them to 1/10 probability.
   // proc_info.IsQuasiElastic();
   // RIK TODO  still need to test that this works.
   // Then move the photon spectrom to p-hole too
   // Then activate for Argon.
   // Then make plots of the spectra.
   // do not do this for coherent ?  MEC, RES, DIS only ?
   // ask if the exotic processes are used and should get it.
 
   RandomGen * rnd = RandomGen::Instance();
 
   if(evrec->Summary()->ProcInfo().IsQuasiElastic()){ // || rand < 0.1}
     //suppress_probability_factor = 1.0;
     if(nucltgt->Z()==6) this->CarbonTargetSim(evrec);
     // simulate argon with a dedicated calculation
     if(nucltgt->Z()==18) this->ArgonTargetSim(evrec);
   } else if(evrec->Summary()->ProcInfo().IsResonant() ||
             evrec->Summary()->ProcInfo().IsMEC() ||
             evrec->Summary()->ProcInfo().IsDeepInelastic()){
 
     double suppress_probability_factor = 0.20;
     // deexcitation is less likely after multiple nucleon knockout
     // because there is too much energy.
     // the decay will happen via nucleon or alpha ejection
     // and the KE will be carried away in that fashion, not gamma.
     if(rnd->RndDec().Rndm() < suppress_probability_factor){
       if(nucltgt->Z()==6) this->CarbonTargetSim(evrec);
       // simulate argon with the same probabilities.
       // Argoneut using FLUKA says
       if(nucltgt->Z()==18) this->ArgonTargetSim(evrec);
     } else {
       //std::cout << "Rik made none nonQE " << std::endl;
     }
 
   }
 
 
            // else if rand < 0.1
 
   LOG("NucDeEx", pINFO)
      << "Done with this event";
 }

Member Data Documentation

bool genie::NucDeExcitationSim::fDoArgon = false

private

Definition at line 56 of file NucDeExcitationSim.h.

Referenced by ArgonTargetSim(), and LoadConfig().

bool genie::NucDeExcitationSim::fDoCarbon = false

private

Definition at line 55 of file NucDeExcitationSim.h.

Referenced by CarbonTargetSim(), and LoadConfig().

The documentation for this class was generated from the following files:

Public Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation