G4QIonIonElastic Class Reference

#include <G4QIonIonElastic.hh>

Inheritance diagram for G4QIonIonElastic:

Public Member Functions
	G4QIonIonElastic (const G4String &processName="CHIPS_IonIonElasticScattering")
	~G4QIonIonElastic ()
G4bool	IsApplicable (const G4ParticleDefinition &particle)
G4double	GetMeanFreePath (const G4Track &aTrack, G4double previousStepSize, G4ForceCondition *condition)
G4VParticleChange *	PostStepDoIt (const G4Track &aTrack, const G4Step &aStep)
G4LorentzVector	GetEnegryMomentumConservation ()
G4int	GetNumberOfNeutronsInTarget ()
Public Member Functions inherited from G4VDiscreteProcess
	G4VDiscreteProcess (const G4String &, G4ProcessType aType=fNotDefined)
	G4VDiscreteProcess (G4VDiscreteProcess &)
virtual	~G4VDiscreteProcess ()
virtual G4double	PostStepGetPhysicalInteractionLength (const G4Track &track, G4double previousStepSize, G4ForceCondition *condition)
virtual G4VParticleChange *	PostStepDoIt (const G4Track &, const G4Step &)
virtual G4double	AlongStepGetPhysicalInteractionLength (const G4Track &, G4double, G4double, G4double &, G4GPILSelection *)
virtual G4double	AtRestGetPhysicalInteractionLength (const G4Track &, G4ForceCondition *)
virtual G4VParticleChange *	AtRestDoIt (const G4Track &, const G4Step &)
virtual G4VParticleChange *	AlongStepDoIt (const G4Track &, const G4Step &)
Public Member Functions inherited from G4VProcess
	G4VProcess (const G4String &aName="NoName", G4ProcessType aType=fNotDefined)
	G4VProcess (const G4VProcess &right)
virtual	~G4VProcess ()
G4int	operator== (const G4VProcess &right) const
G4int	operator!= (const G4VProcess &right) const
virtual G4VParticleChange *	PostStepDoIt (const G4Track &track, const G4Step &stepData)=0
virtual G4VParticleChange *	AlongStepDoIt (const G4Track &track, const G4Step &stepData)=0
virtual G4VParticleChange *	AtRestDoIt (const G4Track &track, const G4Step &stepData)=0
virtual G4double	AlongStepGetPhysicalInteractionLength (const G4Track &track, G4double previousStepSize, G4double currentMinimumStep, G4double &proposedSafety, G4GPILSelection *selection)=0
virtual G4double	AtRestGetPhysicalInteractionLength (const G4Track &track, G4ForceCondition *condition)=0
virtual G4double	PostStepGetPhysicalInteractionLength (const G4Track &track, G4double previousStepSize, G4ForceCondition *condition)=0
G4double	GetCurrentInteractionLength () const
void	SetPILfactor (G4double value)
G4double	GetPILfactor () const
G4double	AlongStepGPIL (const G4Track &track, G4double previousStepSize, G4double currentMinimumStep, G4double &proposedSafety, G4GPILSelection *selection)
G4double	AtRestGPIL (const G4Track &track, G4ForceCondition *condition)
G4double	PostStepGPIL (const G4Track &track, G4double previousStepSize, G4ForceCondition *condition)
virtual G4bool	IsApplicable (const G4ParticleDefinition &)
virtual void	BuildPhysicsTable (const G4ParticleDefinition &)
virtual void	PreparePhysicsTable (const G4ParticleDefinition &)
virtual G4bool	StorePhysicsTable (const G4ParticleDefinition *, const G4String &, G4bool)
virtual G4bool	RetrievePhysicsTable (const G4ParticleDefinition *, const G4String &, G4bool)
const G4String &	GetPhysicsTableFileName (const G4ParticleDefinition *, const G4String &directory, const G4String &tableName, G4bool ascii=false)
const G4String &	GetProcessName () const
G4ProcessType	GetProcessType () const
void	SetProcessType (G4ProcessType)
G4int	GetProcessSubType () const
void	SetProcessSubType (G4int)
virtual void	StartTracking (G4Track *)
virtual void	EndTracking ()
virtual void	SetProcessManager (const G4ProcessManager *)
virtual const G4ProcessManager *	GetProcessManager ()
virtual void	ResetNumberOfInteractionLengthLeft ()
G4double	GetNumberOfInteractionLengthLeft () const
G4double	GetTotalNumberOfInteractionLengthTraversed () const
G4bool	isAtRestDoItIsEnabled () const
G4bool	isAlongStepDoItIsEnabled () const
G4bool	isPostStepDoItIsEnabled () const
virtual void	DumpInfo () const
void	SetVerboseLevel (G4int value)
G4int	GetVerboseLevel () const

Additional Inherited Members
Static Public Member Functions inherited from G4VProcess
static const G4String &	GetProcessTypeName (G4ProcessType)
virtual G4double	GetMeanFreePath (const G4Track &aTrack, G4double previousStepSize, G4ForceCondition *condition)=0
Protected Member Functions inherited from G4VProcess
void	SubtractNumberOfInteractionLengthLeft (G4double previousStepSize)
void	ClearNumberOfInteractionLengthLeft ()
Protected Attributes inherited from G4VProcess
const G4ProcessManager *	aProcessManager
G4VParticleChange *	pParticleChange
G4ParticleChange	aParticleChange
G4double	theNumberOfInteractionLengthLeft
G4double	currentInteractionLength
G4double	theInitialNumberOfInteractionLength
G4String	theProcessName
G4String	thePhysicsTableFileName
G4ProcessType	theProcessType
G4int	theProcessSubType
G4double	thePILfactor
G4bool	enableAtRestDoIt
G4bool	enableAlongStepDoIt
G4bool	enablePostStepDoIt
G4int	verboseLevel

Detailed Description

Definition at line 66 of file G4QIonIonElastic.hh.

Constructor & Destructor Documentation

G4QIonIonElastic()

G4QIonIonElastic::G4QIonIonElastic

(

const G4String &

processName = "CHIPS_IonIonElasticScattering"

)

Definition at line 60 of file G4QIonIonElastic.cc.

                                                             :
  G4VDiscreteProcess(processName, fHadronic)
{
  G4HadronicDeprecate("G4QIonIonElastic");
 
#ifdef debug
  G4cout<<"G4QIonIonElastic::Constructor is called processName="<<processName<<G4endl;
#endif
  if (verboseLevel>0) G4cout << GetProcessName() << " process is created "<< G4endl;
  //G4QCHIPSWorld::Get()->GetParticles(nPartCWorld); // Create CHIPS World (234 part. max)
}

~G4QIonIonElastic()

G4QIonIonElastic::~G4QIonIonElastic

(

)

Definition at line 73 of file G4QIonIonElastic.cc.

{}

Member Function Documentation

GetEnegryMomentumConservation()

G4LorentzVector G4QIonIonElastic::GetEnegryMomentumConservation ( )

inline

Definition at line 94 of file G4QIonIonElastic.hh.

{return EnMomConservation;}

GetMeanFreePath()

G4double G4QIonIonElastic::GetMeanFreePath ( const G4Track &  aTrack, G4double  previousStepSize, G4ForceCondition *  condition  )

virtual

Implements G4VDiscreteProcess.

Definition at line 78 of file G4QIonIonElastic.cc.

{
  static const G4double mProt = G4QPDGCode(2212).GetMass()/MeV;// CHIPS proton Mass in MeV
  *Fc = NotForced;
  const G4DynamicParticle* incidentParticle = aTrack.GetDynamicParticle();
  G4ParticleDefinition* incidentParticleDefinition=incidentParticle->GetDefinition();
  if( !IsApplicable(*incidentParticleDefinition))
    G4cout<<"-Warning-G4QIonIonElastic::GetMeanFreePath: notImplementedParticle"<<G4endl;
  // Calculate the mean Cross Section for the set of Elements(*Isotopes) in the Material
  G4double Momentum = incidentParticle->GetTotalMomentum(); // 3-momentum of the Particle
#ifdef debug
  G4double KinEn = incidentParticle->GetKineticEnergy();
  G4cout<<"G4QIonIonElastic::GetMeanFreePath: kinE="<<KinEn<<",Mom="<<Momentum<<G4endl;
#endif
  const G4Material* material = aTrack.GetMaterial();        // Get the current material
  const G4double* NOfNucPerVolume = material->GetVecNbOfAtomsPerVolume();
  const G4ElementVector* theElementVector = material->GetElementVector();
  G4int nE=material->GetNumberOfElements();
#ifdef debug
  G4cout<<"G4QIonIonElastic::GetMeanFreePath:"<<nE<<" Elem's in theMaterial"<<G4endl;
#endif
  G4VQCrossSection* CSmanager=G4QIonIonCrossSection::GetPointer();
  G4VQCrossSection* PCSmanager=G4QProtonElasticCrossSection::GetPointer();
  G4int pPDG=0;
  // Probably enough: pPDG=incidentParticleDefinition->GetPDGEncoding();
  G4int pZ=static_cast<G4int>(incidentParticleDefinition->GetPDGCharge());
  G4int pA=incidentParticleDefinition->GetBaryonNumber();
  if      (incidentParticleDefinition ==  G4Deuteron::Deuteron()     ) pPDG = 1000010020;
  else if (incidentParticleDefinition ==  G4Alpha::Alpha()           ) pPDG = 1000020040;
  else if (incidentParticleDefinition ==  G4Triton::Triton()         ) pPDG = 1000010030;
  else if (incidentParticleDefinition ==  G4He3::He3()               ) pPDG = 1000020030;
  else if (incidentParticleDefinition ==  G4GenericIon::GenericIon() || (pZ > 0 && pA > 0))
  {
    pPDG=incidentParticleDefinition->GetPDGEncoding();
#ifdef debug
    G4int prPDG=1000000000+10000*pZ+10*pA;
    G4cout<<"G4QIonIonElastic::GetMeanFreePath: PDG="<<prPDG<<"="<<pPDG<<G4endl;
#endif
  }
  else G4cout<<"-Warning-G4QIonIonElastic::GetMeanFreePath:Unknown projectile Ion"<<G4endl;
  Momentum/=incidentParticleDefinition->GetBaryonNumber(); // Divide Mom by projectile A
  G4QIsotope* Isotopes = G4QIsotope::Get(); // Pointer to the G4QIsotopes singleton
  G4double sigma=0.;                        // Sums over elements for the material
  G4int IPIE=IsoProbInEl.size();            // How many old elements?
  if(IPIE) for(G4int ip=0; ip<IPIE; ++ip)   // Clean up the SumProb's of Isotopes (SPI)
  {
    std::vector<G4double>* SPI=IsoProbInEl[ip]; // Pointer to the SPI vector
    SPI->clear();
    delete SPI;
    std::vector<G4int>* IsN=ElIsoN[ip];     // Pointer to the N vector
    IsN->clear();
    delete IsN;
  }
  ElProbInMat.clear();                      // Clean up the SumProb's of Elements (SPE)
  ElementZ.clear();                         // Clear the body vector for Z of Elements
  IsoProbInEl.clear();                      // Clear the body vector for SPI
  ElIsoN.clear();                           // Clear the body vector for N of Isotopes
  for(G4int i=0; i<nE; ++i)
  {
    G4Element* pElement=(*theElementVector)[i]; // Pointer to the current element
    G4int Z = static_cast<G4int>(pElement->GetZ()); // Z of the Element
    ElementZ.push_back(Z);                  // Remember Z of the Element
    G4int isoSize=0;                        // The default for the isoVectorLength is 0
    G4int indEl=0;                          // Index of non-natural element or 0(default)
    G4IsotopeVector* isoVector=pElement->GetIsotopeVector(); // Get the predefined IsoVect
    if(isoVector) isoSize=isoVector->size();// Get size of the existing isotopeVector
#ifdef debug
    G4cout<<"G4QIonIonElastic::GetMeanFreePath: isovectorLength="<<isoSize<<G4endl;
#endif
    if(isoSize)                             // The Element has non-trivial abundance set
    {
      indEl=pElement->GetIndex()+1;         // Index of the non-trivial element is an order
#ifdef debug
      G4cout<<"G4QIIEl::GetMFP:iE="<<indEl<<", def="<<Isotopes->IsDefined(Z,indEl)<<G4endl;
#endif
      if(!Isotopes->IsDefined(Z,indEl))     // This index is not defined for this Z: define
      {
        std::vector<std::pair<G4int,G4double>*>* newAbund =
                                               new std::vector<std::pair<G4int,G4double>*>;
        G4double* abuVector=pElement->GetRelativeAbundanceVector();
        for(G4int j=0; j<isoSize; j++)      // Calculation of abundance vector for isotopes
        {
          G4int N=pElement->GetIsotope(j)->GetN()-Z; // N means A=N+Z !
          if(pElement->GetIsotope(j)->GetZ()!=Z) G4cerr<<"G4QIonIonEl::GetMeanFreePath Z="
                                         <<pElement->GetIsotope(j)->GetZ()<<"#"<<Z<<G4endl;
          G4double abund=abuVector[j];
          std::pair<G4int,G4double>* pr= new std::pair<G4int,G4double>(N,abund);
#ifdef debug
          G4cout<<"G4QIonIonElastic::GetMeanFP:pair#="<<j<<",N="<<N<<",ab="<<abund<<G4endl;
#endif
          newAbund->push_back(pr);
        }
#ifdef debug
        G4cout<<"G4QIonIonElastic::GetMeanFP: pairVectorLength="<<newAbund->size()<<G4endl;
#endif
        indEl=G4QIsotope::Get()->InitElement(Z,indEl,newAbund); // definition of the newInd
        for(G4int k=0; k<isoSize; k++) delete (*newAbund)[k];   // Cleaning temporary
        delete newAbund; // Was "new" in the beginning of the name space
      }
    }
    std::vector<std::pair<G4int,G4double>*>* cs= Isotopes->GetCSVector(Z,indEl);//CSPointer
    std::vector<G4double>* SPI = new std::vector<G4double>; // Pointer to the SPI vector
    IsoProbInEl.push_back(SPI);
    std::vector<G4int>* IsN = new std::vector<G4int>; // Pointer to the N vector
    ElIsoN.push_back(IsN);
    G4int nIs=cs->size();                   // A#Of Isotopes in the Element
#ifdef debug
    G4cout<<"G4QIonIonEl::GetMFP:=***=> #isot="<<nIs<<", Z="<<Z<<", indEl="<<indEl<<G4endl;
#endif
    G4double susi=0.;                       // sum of CS over isotopes
    if(nIs) for(G4int j=0; j<nIs; j++)      // Calculate CS for eachIsotope of El
    {
      std::pair<G4int,G4double>* curIs=(*cs)[j]; // A pointer, which is used twice
      G4int N=curIs->first;                 // #of Neuterons in the isotope j of El i
      IsN->push_back(N);                    // Remember Min N for the Element
#ifdef debug
      G4cout<<"G4QIIE::GMFP:true,P="<<Momentum<<",Z="<<Z<<",N="<<N<<",pPDG="<<pPDG<<G4endl;
#endif
      G4bool ccsf=false;                    // Extract elastic Ion-Ion cross-section
#ifdef debug
      G4cout<<"G4QIonIonElastic::GMFP: GetCS #1 j="<<j<<G4endl;
#endif
      G4double CSI=0.;
      if(Z==1 && !N)                        // Proton target. Reversed kinematics.
      {
        G4double projM=G4QPDGCode(2212).GetNuclMass(pZ,pA-pZ,0); // Mass of the projNucleus
        CSI=PCSmanager->GetCrossSection(true, Momentum*mProt/projM, Z, N, 2212); // Ap CS
      }
      else CSI=CSmanager->GetCrossSection(ccsf,Momentum,Z,N,pPDG); // CS(j,i) for isotope
#ifdef debug
      G4cout<<"G4QIonIonElastic::GMFP: jI="<<j<<", Zt="<<Z<<", Nt="<<N<<", Mom="<<Momentum
            <<", XSec="<<CSI/millibarn<<G4endl;
#endif
      curIs->second = CSI;
      susi+=CSI;                            // Make a sum per isotopes
      SPI->push_back(susi);                 // Remember summed cross-section
    } // End of temporary initialization of the cross sections in the G4QIsotope singeltone
    sigma+=Isotopes->GetMeanCrossSection(Z,indEl)*NOfNucPerVolume[i];//SUM(MeanCS*NOfNperV)
#ifdef debug
    G4cout<<"G4QIonIonEl::GMFP:<S>="<<Isotopes->GetMeanCrossSection(Z,indEl)<<",AddToSig="
          <<Isotopes->GetMeanCrossSection(Z,indEl)*NOfNucPerVolume[i]<<G4endl;
#endif
    ElProbInMat.push_back(sigma);
  } // End of LOOP over Elements
  // Check that cross section is not zero and return the mean free path
#ifdef debug
  G4cout<<"G4QIonIonElastic::GetMeanFreePath: MeanFreePath="<<1./sigma<<G4endl;
#endif
  if(sigma > 0.00000000001) return 1./sigma;                 // Mean path [distance] 
  return DBL_MAX;
}

Referenced by PostStepDoIt().

GetNumberOfNeutronsInTarget()

G4int G4QIonIonElastic::GetNumberOfNeutronsInTarget ( )

inline

Definition at line 96 of file G4QIonIonElastic.hh.

{return nOfNeutrons;}

IsApplicable()

G4bool G4QIonIonElastic::IsApplicable ( const G4ParticleDefinition &  particle )

virtual

Reimplemented from G4VProcess.

Definition at line 232 of file G4QIonIonElastic.cc.

{
  G4int Z=static_cast<G4int>(particle.GetPDGCharge());
  G4int A=particle.GetBaryonNumber();
  if      (particle == *( G4Deuteron::Deuteron()     )) return true;
  else if (particle == *( G4Alpha::Alpha()           )) return true;
  else if (particle == *( G4Triton::Triton()         )) return true;
  else if (particle == *( G4He3::He3()               )) return true;
  else if (particle == *( G4GenericIon::GenericIon() )) return true;
  else if (Z > 0 && A > 0)                              return true;
#ifdef debug
  G4cout<<"***>>G4QIonIonElastic::IsApplicable: PDG="<<particle.GetPDGEncoding()<<", A="
        <<A<<", Z="<<Z<<G4endl;
#endif
  return false;
}

Referenced by GetMeanFreePath(), and PostStepDoIt().

PostStepDoIt()

G4VParticleChange * G4QIonIonElastic::PostStepDoIt ( const G4Track &  aTrack, const G4Step &  aStep  )

virtual

Reimplemented from G4VDiscreteProcess.

Definition at line 249 of file G4QIonIonElastic.cc.

{
  static const G4double mProt= G4QPDGCode(2212).GetMass(); // CHIPS proton mass in MeV
  static const G4double fm2MeV2 = 3*38938./1.09; // (3/1.09)*(hc)^2 in fm^2*MeV^2
  static G4bool CWinit = true;                   // CHIPS Warld needs to be initted
  if(CWinit)
  {
    CWinit=false;
    G4QCHIPSWorld::Get()->GetParticles(nPartCWorld); // Create CHIPS World (234 part.max)
  }
  //-------------------------------------------------------------------------------------
  const G4DynamicParticle* projHadron = track.GetDynamicParticle();
  const G4ParticleDefinition* particle=projHadron->GetDefinition();
#ifdef debug
  G4cout<<"G4QIonIonElastic::PostStepDoIt: Before the GetMeanFreePath is called In4M="
        <<projHadron->Get4Momentum()<<" of PDG="<<particle->GetPDGEncoding()<<", Type="
        <<particle->GetParticleType()<<", Subtp="<<particle->GetParticleSubType()<<G4endl;
#endif
  G4LorentzVector proj4M=(projHadron->Get4Momentum())/MeV; // Convert to MeV!
  G4double momentum = projHadron->GetTotalMomentum()/MeV; // 3-momentum of the Proj in MeV
  G4double Momentum = proj4M.rho();                   // @@ Just for the test purposes
  if(std::fabs(Momentum-momentum)>.000001)
    G4cerr<<"-Warn-G4QIonIonElastic::PostStepDoIt:P(IU)="<<Momentum<<"#"<<momentum<<G4endl;
  G4double pM2=proj4M.m2();        // in MeV^2
  G4double pM=std::sqrt(pM2);      // in MeV
#ifdef pdebug
  G4cout<<"G4QIonIonEl::PostStepDoIt: pP(IU)="<<Momentum<<"="<<momentum<<",pM="<<pM<<G4endl;
#endif
  if (!IsApplicable(*particle))  // Check applicability
  {
    G4cerr<<"G4QIonIonElastic::PostStepDoIt: Only NA elastic is implemented."<<G4endl;
    return 0;
  }
  const G4Material* material = track.GetMaterial();      // Get the current material
  const G4ElementVector* theElementVector = material->GetElementVector();
  G4int nE=material->GetNumberOfElements();
#ifdef debug
  G4cout<<"G4QIonIonElastic::PostStepDoIt: "<<nE<<" elements in the material."<<G4endl;
#endif
  // Probably enough: projPDG=particle->GetPDGEncoding();
  G4int projPDG=0;                           // CHIPS PDG Code for the captured hadron
  G4int pZ=static_cast<G4int>(particle->GetPDGCharge());
  G4int pA=particle->GetBaryonNumber();
  if      (particle ==  G4Deuteron::Deuteron() ) projPDG= 1000010020;
  else if (particle ==  G4Alpha::Alpha()       ) projPDG= 1000020040;
  else if (particle ==  G4Triton::Triton()     ) projPDG= 1000010030;
  else if (particle ==  G4He3::He3()           ) projPDG= 1000020030;
  else if (particle ==  G4GenericIon::GenericIon() || (pZ > 0 && pA > 0))
  {
    projPDG=particle->GetPDGEncoding();
#ifdef debug
    G4int prPDG=1000000000+10000*pZ+10*pA;
    G4cout<<"G4QIonIonElastic::PostStepDoIt: PDG="<<prPDG<<"="<<projPDG<<G4endl;
#endif
  }
  else G4cout<<"-Warning-G4QIonIonElastic::PostStepDoIt:Unknown projectile Ion"<<G4endl;
#ifdef debug
  G4int prPDG=particle->GetPDGEncoding();
  G4cout<<"G4QIonIonElastic::PostStepDoIt: projPDG="<<projPDG<<", stPDG="<<prPDG<<G4endl;
#endif
  if(!projPDG)
  {
    G4cerr<<"-Warning-G4QIonIonElastic::PostStepDoIt:Undefined interactingNucleus"<<G4endl;
    return 0;
  }
  G4int pN=pA-pZ;                           // Projectile N
  G4int EPIM=ElProbInMat.size();
#ifdef debug
  G4cout<<"G4QIonIonElastic::PSDI:m="<<EPIM<<",n="<<nE<<",T="<<ElProbInMat[EPIM-1]<<G4endl;
#endif
  G4int i=0;
  if(EPIM>1)
  {
    G4double rnd = ElProbInMat[EPIM-1]*G4UniformRand();
    for(i=0; i<nE; ++i)
    {
#ifdef debug
      G4cout<<"G4QIonIonElastic::PSDI: EPM["<<i<<"]="<<ElProbInMat[i]<<", r="<<rnd<<G4endl;
#endif
      if (rnd<ElProbInMat[i]) break;
    }
    if(i>=nE) i=nE-1;                        // Top limit for the Element
  }
  G4Element* pElement=(*theElementVector)[i];
  G4int tZ=static_cast<G4int>(pElement->GetZ());
#ifdef debug
    G4cout<<"G4QIonIonElastic::PostStepDoIt: i="<<i<<", Z(element)="<<tZ<<G4endl;
#endif
  if(tZ<=0)
  {
    G4cerr<<"---Warning---G4QIonIonElastic::PostStepDoIt: Element with Z="<<tZ<<G4endl;
    if(tZ<0) return 0;
  }
  std::vector<G4double>* SPI = IsoProbInEl[i];// Vector of summedProbabilities for isotopes
  std::vector<G4int>* IsN = ElIsoN[i];     // Vector of "#of neutrons" in the isotope El[i]
  G4int nofIsot=SPI->size();               // #of isotopes in the element i
#ifdef debug
  G4cout<<"G4QIonIonElastic::PosStDoIt: nI="<<nofIsot<<",T="<<(*SPI)[nofIsot-1]<<G4endl;
#endif
  G4int j=0;
  if(nofIsot>1)
  {
    G4double rndI=(*SPI)[nofIsot-1]*G4UniformRand(); // Randomize the isotop of the Element
    for(j=0; j<nofIsot; ++j)
    {
#ifdef debug
      G4cout<<"G4QIonIonElastic::PostStDI: SP["<<j<<"]="<<(*SPI)[j]<<", r="<<rndI<<G4endl;
#endif
      if(rndI < (*SPI)[j]) break;
    }
    if(j>=nofIsot) j=nofIsot-1;            // Top limit for the isotope
  }
  G4int tN =(*IsN)[j]; ;                   // Randomized number of neutrons
#ifdef debug
  G4cout<<"G4QIonIonElastic::PostStepDoIt:j="<<i<<",N(isotope)="<<tN<<",MeV="<<MeV<<G4endl;
#endif
  if(tN<0)
  {
    G4cerr<<"-Warning-G4QIonIonElastic::PostStepDoIt:IsotopeZ="<<tZ<<" & 0>N="<<tN<<G4endl;
    return 0;
  }
  nOfNeutrons=tN;                           // Remember it for the energy-momentum check
#ifdef debug
  G4cout<<"G4QIonIonElastic::PostStepDoIt: N="<<tN<<" for element with Z="<<tZ<<G4endl;
#endif
  aParticleChange.Initialize(track);
#ifdef debug
  G4cout<<"G4QIonIonElastic::PostStepDoIt: track is initialized"<<G4endl;
#endif
  G4double weight        = track.GetWeight();
  G4double localtime     = track.GetGlobalTime();
  G4ThreeVector position = track.GetPosition();
#ifdef debug
  G4cout<<"G4QIonIonElastic::PostStepDoIt: before Touchable extraction"<<G4endl;
#endif
  G4TouchableHandle trTouchable = track.GetTouchableHandle();
#ifdef debug
  G4cout<<"G4QIonIonElastic::PostStepDoIt: Touchable is extracted"<<G4endl;
#endif
  // Definitions for do nothing
  G4double kinEnergy= projHadron->GetKineticEnergy()*MeV; // Kin energy in MeV (Is *MeV n?)
  G4ParticleMomentum dir = projHadron->GetMomentumDirection();// It is a unit three-vector
  // !! Exception for the proton target !!
  G4bool revkin=false;
  G4ThreeVector bvel(0.,0.,0.);
  G4int tA=tZ+tN;
  G4int targPDG=90000000+tZ*1000+tN;       // CHIPS PDG Code of the target nucleus
  G4QPDGCode targQPDG(targPDG);            // @@ one can use G4Ion & get rid of CHIPS World
  G4double tM=targQPDG.GetMass();          // CHIPS target mass in MeV
  G4LorentzVector targ4M(0.,0.,0.,tM);
  if(tZ==1 && !tN)                         // Update parameters in DB and trans to Antilab
  {
    G4ForceCondition cond=NotForced;
    GetMeanFreePath(track, -27., &cond);   // @@ ?? jus to update parameters?
#ifdef debug
    G4cout<<"G4QIonIonElastic::PostStepDoIt: After the GetMeanFreePath is called"<<G4endl;
#endif
    revkin=true;
    tZ=pZ;
    tN=pN;
    tA=tZ+tN;
    tM=pM;
    pZ=1;                                  // @@ Is that necessary ??
    pN=0;                                  // @@ Is that necessary ??
    pA=1;                                  // @@ Is that necessary ??
    pM=mProt;
    bvel=proj4M.vect()/proj4M.e();         // Lab->Antilab transition boost velocity
    proj4M=targ4M.boost(-bvel);            // Proton 4-mom in Antilab
    targ4M=G4LorentzVector(0.,0.,0.,tM);   // Projectile nucleus 4-mom in Antilab
    Momentum = proj4M.rho();               // Recalculate Momentum in Antilab
  }
  G4LorentzVector tot4M=proj4M+targ4M;     // Total 4-mom of the reaction
#ifdef debug
  G4cout<<"G4QIonIonElastic::PostStDI: tM="<<tM<<", p4M="<<proj4M<<", t4M="<<tot4M<<G4endl;
#endif
  EnMomConservation=tot4M;                 // Total 4-mom of reaction for E/M conservation
  G4VQCrossSection* PELmanager=G4QProtonElasticCrossSection::GetPointer();
  G4VQCrossSection* NELmanager=G4QNeutronElasticCrossSection::GetPointer();
  G4VQCrossSection* CSmanager=G4QIonIonCrossSection::GetPointer();
  // @@ Probably this is not necessary any more
#ifdef debug
  G4cout<<"G4QIIEl::PSDI:f, P="<<Momentum<<",Z="<<tZ<<",N="<<tN<<",tPDG="<<projPDG<<G4endl;
#endif
  // false means elastic cross-section
  G4double xSec=0.;                           // Proto of Recalculated Cross Section
  if(revkin) xSec=PELmanager->GetCrossSection(false, Momentum, tZ, tN, 2212);
  else       xSec=CSmanager->GetCrossSection(false, Momentum, tZ, tN, projPDG);
#ifdef debug
  G4cout<<"G4QIIEl::PSDI: pPDG="<<projPDG<<",P="<<Momentum<<",CS="<<xSec/millibarn<<G4endl;
#endif
#ifdef nandebug
  if(xSec>0. || xSec<0. || xSec==0);
  else  G4cout<<"-NaN-Warning-G4QIonIonElastic::PostStDoIt: xSec="<<xSec/millibarn<<G4endl;
#endif
  // @@ check a possibility to separate p, n, or alpha (!)
  if(xSec <= 0.) // The cross-section iz 0 -> Do Nothing
  {
#ifdef pdebug
    G4cerr<<"-Warning-G4QIonIonElastic::PostStDoIt: *Zero cross-section* PDG="<<projPDG
          <<",tPDG="<<targPDG<<",P="<<Momentum<<G4endl;
#endif
    //Do Nothing Action insead of the reaction
    aParticleChange.ProposeEnergy(kinEnergy);
    aParticleChange.ProposeLocalEnergyDeposit(0.);
    aParticleChange.ProposeMomentumDirection(dir) ;
    return G4VDiscreteProcess::PostStepDoIt(track,step);
  }
  G4double mint=0;
  G4double maxt=0;
  G4double dtM=tM+tM;
  if(revkin)
  {
    mint=PELmanager->GetExchangeT(tZ,tN,2212); // functional randomized -t in MeV^2
    maxt=PELmanager->GetHMaxT();
  }
  else
  {
    G4double PA=Momentum*pA;
    G4double PA2=PA*PA;
    maxt=dtM*PA2/(std::sqrt(PA2+pM2)+tM/2+pM2/dtM);
#ifdef pdebug
    G4cout<<"G4QIonIonElastic::PostStDoIt:pPDG="<<projPDG<<",tPDG="<<targPDG<<",P="
          <<Momentum<<",CS="<<xSec<<",maxt="<<maxt<<G4endl;
#endif
    xSec=PELmanager->GetCrossSection(false, Momentum, 1, 0, 2212);// pp=nn
    G4double B1=PELmanager->GetSlope(1,0,2212); // slope for pp=nn
    xSec=NELmanager->GetCrossSection(false, Momentum, 1, 0, 2112);// np=pn
    G4double B2 =NELmanager->GetSlope(1,0,2112); // slope for np=pn
    G4double mB =((pZ*tZ+pN*tN)*B1+(pZ*tN+pN*tZ)*B2)/(pA+tA);
    G4double pR2=std::pow(pA+4.,.305)/fm2MeV2;
    G4double tR2=std::pow(tA+4.,.305)/fm2MeV2;
    G4double eB =mB+pR2+tR2;
    mint=-std::log(1.-G4UniformRand()*(1.-std::exp(-eB*maxt)))/eB;
    mint+=mint;
#ifdef pdebug
    G4cout<<"G4QIonIonElastic::PostStDoIt:B1="<<B1<<",B2="<<B2<<",mB="<<mB
          <<",pR2="<<pR2<<",tR2="<<tR2<<",eB="<<eB<<",mint="<<mint<<G4endl;
#endif
  }
#ifdef nandebug
  if(mint>-.0000001);
  else  G4cout<<"-Warning-G4QIonIonElastic::PostStDoIt:-t="<<mint<<G4endl;
#endif
  G4double cost=1.-mint/maxt; // cos(theta) in CMS
  // 
#ifdef ppdebug
  G4cout<<"G4QIonIonElastic::PoStDoI:t="<<mint<<",dpcm2="<<CSmanager->GetHMaxT()<<",Ek="
        <<kinEnergy<<",tM="<<tM<<",pM="<<pM<<",cost="<<cost<<G4endl;
#endif
  if(cost>1. || cost<-1. || !(cost>-1. || cost<1.))
  {
    if(cost>1.000001 || cost<-1.000001 || !(cost>-1. || cost<1.))
    {
      G4double tM2=tM*tM;                         // Squared target mass
      G4double pEn=pM+kinEnergy;                  // tot projectile Energy in MeV
      G4double sM=dtM*pEn+tM2+pM2;                // Mondelstam s
      G4double twop2cm=(tM2+tM2)*(pEn*pEn-pM2)/sM;// Max_t/2 (2*p^2_cm)
      G4cout<<"-Warning-G4QIonIonElastic::PoStDI:cos="<<cost<<",t="<<mint<<",T="<<kinEnergy
            <<",tM="<<tM<<",tmax="<<2*kinEnergy*tM<<",p="<<projPDG<<",t="<<targPDG<<G4endl;
      G4cout<<"G4QIonIonElastic::PSDI:dpcm2="<<twop2cm<<"="<<CSmanager->GetHMaxT()<<G4endl;
    }
    if     (cost>1.)  cost=1.;
    else if(cost<-1.) cost=-1.;
  }
  G4LorentzVector scat4M(0.,0.,0.,pM);            // 4-mom of the scattered projectile
  G4LorentzVector reco4M(0.,0.,0.,tM);            // 4-mom of the recoil target
  G4LorentzVector dir4M=tot4M-G4LorentzVector(0.,0.,0.,(tot4M.e()-tM-pM)*.01);
  if(!G4QHadron(tot4M).RelDecayIn2(scat4M, reco4M, dir4M, cost, cost))
  {
    G4cout<<"-Warning-G4QIonIonE::PSDI:t4M="<<tot4M<<",pM="<<pM<<",tM="<<tM<<",cost="
          <<cost<<G4endl;
  }
  if(revkin)
  {
    G4LorentzVector tmpLV=scat4M.boost(bvel);     // Recoil target Back to LS
    scat4M=reco4M.boost(bvel);                    // Scattered Progectile Back to LS
    reco4M=tmpLV;
    pM=tM;
    tM=mProt;
  }
#ifdef debug
  G4cout<<"G4QIonIonElast::PSDI:s4M="<<scat4M<<"+r4M="<<reco4M<<"="<<scat4M+reco4M<<G4endl;
  G4cout<<"G4QIonIonElastic::PSDI:scatE="<<scat4M.e()-pM<<",recoE="<<reco4M.e()-tM<<",d4M="
        <<tot4M-scat4M-reco4M<<G4endl;
#endif
  // Update G4VParticleChange for the scattered projectile
  G4double finE=scat4M.e()-pM;             // Final kinetic energy of the scattered proton
  if(finE>0.0) aParticleChange.ProposeEnergy(finE);
  else
  {
    if(finE<-1.e-8 || !(finE>-1.||finE<1.)) // NAN or negative
      G4cerr<<"*Warning*G4QIonIonElastic::PostStDoIt: Zero or negative scattered E="<<finE
            <<", s4M="<<scat4M<<", r4M="<<reco4M<<", d4M="<<tot4M-scat4M-reco4M<<G4endl;
    aParticleChange.ProposeEnergy(0.) ;
    aParticleChange.ProposeTrackStatus(fStopButAlive);
  }
  G4ThreeVector findir=scat4M.vect()/scat4M.rho();  // Unit vector in new direction
  aParticleChange.ProposeMomentumDirection(findir); // new direction for the scattered part
  EnMomConservation-=scat4M;                        // It must be initialized by (pE+tM,pP)
  // This is how in general the secondary should be identified
  G4DynamicParticle* theSec = new G4DynamicParticle; // A secondary for the recoil hadron 
#ifdef pdebug
  G4cout<<"G4QIonIonElastic::PostStepDoIt: Ion tZ="<<tZ<<", tA="<<tA<<G4endl;
#endif
  G4ParticleDefinition* theDefinition=0;
  if(revkin) theDefinition = G4Proton::Proton();
  else       theDefinition = G4ParticleTable::GetParticleTable()->FindIon(tZ,tA,0,tZ);
  if(!theDefinition)G4cout<<"-Warning-G4QIonIonElastic::PoStDI:drop PDG="<<targPDG<<G4endl;
#ifdef pdebug
  G4cout<<"G4QIonIonElastic::PoStDI:RecoilName="<<theDefinition->GetParticleName()<<G4endl;
#endif
  theSec->SetDefinition(theDefinition);
  EnMomConservation-=reco4M;
#ifdef tdebug
  G4cout<<"G4QIonIonElastic::PSD:"<<targPDG<<reco4M<<reco4M.m()<<EnMomConservation<<G4endl;
#endif
  theSec->Set4Momentum(reco4M);
#ifdef debug
  G4ThreeVector curD=theSec->GetMomentumDirection();
  G4double curM=theSec->GetMass();
  G4double curE=theSec->GetKineticEnergy()+curM;
  G4cout<<"G4QIonIonElastic::PSDI: p="<<curD<<curD.mag()<<",e="<<curE<<",m="<<curM<<G4endl;
#endif
  // Make a recoil nucleus
  G4Track* aNewTrack = new G4Track(theSec, localtime, position );
  aNewTrack->SetWeight(weight);                                   //    weighted
  aNewTrack->SetTouchableHandle(trTouchable);
  aParticleChange.AddSecondary( aNewTrack );
#ifdef debug
    G4cout<<"G4QIonIonElastic::PostStepDoIt: **** PostStepDoIt is done ****"<<G4endl;
#endif
  return G4VDiscreteProcess::PostStepDoIt(track, step);
}

---

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

• G4QIonIonElastic.hh
• G4QIonIonElastic.cc