source: trunk/source/processes/hadronic/models/chiral_inv_phase_space/interface/src/G4QCoherentChargeExchange.cc @ 968

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26// $Id: G4QCoherentChargeExchange.cc,v 1.7 2008/10/02 21:10:07 dennis Exp $
27// GEANT4 tag $Name: geant4-09-02-ref-02 $
28//
29//      ---------------- G4QCoherentChargeExchange class -----------------
30//                 by Mikhail Kossov, December 2003.
31// G4QCoherentChargeExchange class of the CHIPS Simulation Branch in GEANT4
32// ---------------------------------------------------------------
33// ****************************************************************************************
34// ********** This CLASS is temporary moved from the photolepton_hadron directory *********
35// ****************************************************************************************
36
37//#define debug
38//#define pdebug
39//#define tdebug
40//#define nandebug
41//#define ppdebug
42
43#include "G4QCoherentChargeExchange.hh"
44
45// Initialization of static vectors
46G4int    G4QCoherentChargeExchange::nPartCWorld=152;  // #of particles initialized in CHIPS
47std::vector<G4int> G4QCoherentChargeExchange::ElementZ; // Z of element(i) in theLastCalc
48std::vector<G4double> G4QCoherentChargeExchange::ElProbInMat; // SumProbOfElem in Material
49std::vector<std::vector<G4int>*> G4QCoherentChargeExchange::ElIsoN;// N of isotope(j), E(i)
50std::vector<std::vector<G4double>*>G4QCoherentChargeExchange::IsoProbInEl;//SumProbIsotE(i)
51
52// Constructor
53G4QCoherentChargeExchange::G4QCoherentChargeExchange(const G4String& processName)
54  : G4VDiscreteProcess(processName, fHadronic)
55{
56#ifdef debug
57  G4cout<<"G4QCohChargeEx::Constructor is called processName="<<processName<<G4endl;
58#endif
59  if (verboseLevel>0) G4cout << GetProcessName() << " process is created "<< G4endl;
60  SetProcessSubType(fChargeExchange);
61  //G4QCHIPSWorld::Get()->GetParticles(nPartCWorld); // Create CHIPS World (234 part. max)
62}
63
64// Destructor
65G4QCoherentChargeExchange::~G4QCoherentChargeExchange() {}
66
67
68G4LorentzVector G4QCoherentChargeExchange::GetEnegryMomentumConservation()
69                                                                {return EnMomConservation;}
70
71G4int G4QCoherentChargeExchange::GetNumberOfNeutronsInTarget() {return nOfNeutrons;}
72
73// output of the function must be in units of length! L=1/sig_V,sig_V=SUM(n(j,i)*sig(j,i)),
74// where n(i,j) is a number of nuclei of the isotop j of the element i in V=1(lengtUnit^3)
75// ********** All CHIPS cross sections are calculated in the surface units ************
76G4double G4QCoherentChargeExchange::GetMeanFreePath(const G4Track& aTrack,G4double Q,
77                                                    G4ForceCondition* Fc)
78{
79  *Fc = NotForced;
80  const G4DynamicParticle* incidentParticle = aTrack.GetDynamicParticle();
81  G4ParticleDefinition* incidentParticleDefinition=incidentParticle->GetDefinition();
82  if( !IsApplicable(*incidentParticleDefinition))
83    G4cout<<"*W*G4QCohChargeEx::GetMeanFreePath called for notImplementedParticle"<<G4endl;
84  // Calculate the mean Cross Section for the set of Elements(*Isotopes) in the Material
85  G4double Momentum = incidentParticle->GetTotalMomentum(); // 3-momentum of the Particle
86#ifdef debug
87  G4double KinEn = incidentParticle->GetKineticEnergy();
88  G4cout<<"G4QCohChEx::GetMeanFreePath: kinE="<<KinEn<<",Mom="<<Momentum<<G4endl; // Result
89#endif
90  const G4Material* material = aTrack.GetMaterial();        // Get the current material
91  const G4double* NOfNucPerVolume = material->GetVecNbOfAtomsPerVolume();
92  const G4ElementVector* theElementVector = material->GetElementVector();
93  G4int nE=material->GetNumberOfElements();
94#ifdef debug
95  G4cout<<"G4QCohChargeExchange::GetMeanFreePath:"<<nE<<" Elem's in theMaterial"<<G4endl;
96#endif
97  G4int pPDG=0;
98
99  if     (incidentParticleDefinition == G4Proton::Proton()  ) pPDG=2212;
100  else if(incidentParticleDefinition == G4Neutron::Neutron()) pPDG=2112;
101  else G4cout<<"G4QCohChargeEx::GetMeanFreePath: only nA & pA are implemented"<<G4endl;
102 
103  G4QIsotope* Isotopes = G4QIsotope::Get(); // Pointer to the G4QIsotopes singleton
104  G4double sigma=0.;                        // Sums over elements for the material
105  G4int IPIE=IsoProbInEl.size();            // How many old elements?
106  if(IPIE) for(G4int ip=0; ip<IPIE; ++ip)   // Clean up the SumProb's of Isotopes (SPI)
107  {
108    std::vector<G4double>* SPI=IsoProbInEl[ip]; // Pointer to the SPI vector
109    SPI->clear();
110    delete SPI;
111    std::vector<G4int>* IsN=ElIsoN[ip];     // Pointer to the N vector
112    IsN->clear();
113    delete IsN;
114  }
115  ElProbInMat.clear();                      // Clean up the SumProb's of Elements (SPE)
116  ElementZ.clear();                         // Clear the body vector for Z of Elements
117  IsoProbInEl.clear();                      // Clear the body vector for SPI
118  ElIsoN.clear();                           // Clear the body vector for N of Isotopes
119  for(G4int i=0; i<nE; ++i)
120  {
121    G4Element* pElement=(*theElementVector)[i]; // Pointer to the current element
122    G4int Z = static_cast<G4int>(pElement->GetZ()); // Z of the Element
123    ElementZ.push_back(Z);                  // Remember Z of the Element
124    G4int isoSize=0;                        // The default for the isoVectorLength is 0
125    G4int indEl=0;                          // Index of non-natural element or 0(default)
126    G4IsotopeVector* isoVector=pElement->GetIsotopeVector(); // Get the predefined IsoVect
127    if(isoVector) isoSize=isoVector->size();// Get size of the existing isotopeVector
128#ifdef debug
129    G4cout<<"G4QCoherentChargeExchange::GetMeanFreePath:isovectorLength="<<isoSize<<G4endl;
130#endif
131    if(isoSize)                             // The Element has non-trivial abundance set
132    {
133      indEl=pElement->GetIndex()+1;         // Index of the non-trivial element is an order
134#ifdef debug
135      G4cout<<"G4QCCX::GetMFP: iE="<<indEl<<", def="<<Isotopes->IsDefined(Z,indEl)<<G4endl;
136#endif
137      if(!Isotopes->IsDefined(Z,indEl))     // This index is not defined for this Z: define
138      {
139        std::vector<std::pair<G4int,G4double>*>* newAbund =
140                                               new std::vector<std::pair<G4int,G4double>*>;
141        G4double* abuVector=pElement->GetRelativeAbundanceVector();
142        for(G4int j=0; j<isoSize; j++)      // Calculation of abundance vector for isotopes
143        {
144          G4int N=pElement->GetIsotope(j)->GetN()-Z; // N means A=N+Z !
145          if(pElement->GetIsotope(j)->GetZ()!=Z)G4cerr<<"G4QCohChX::GetMeanFreePath: Z="
146                                         <<pElement->GetIsotope(j)->GetZ()<<"#"<<Z<<G4endl;
147          G4double abund=abuVector[j];
148                                                                  std::pair<G4int,G4double>* pr= new std::pair<G4int,G4double>(N,abund);
149#ifdef debug
150          G4cout<<"G4QCohChEx::GetMeanFreePath:pair#="<<j<<",N="<<N<<",ab="<<abund<<G4endl;
151#endif
152          newAbund->push_back(pr);
153                                                  }
154#ifdef debug
155        G4cout<<"G4QCohChEx::GetMeanFreePath: pairVectorLength="<<newAbund->size()<<G4endl;
156#endif
157        indEl=G4QIsotope::Get()->InitElement(Z,indEl,newAbund); // definition of the newInd
158        for(G4int k=0; k<isoSize; k++) delete (*newAbund)[k];   // Cleaning temporary
159        delete newAbund; // Was "new" in the beginning of the name space
160      }
161    }
162    std::vector<std::pair<G4int,G4double>*>* cs= Isotopes->GetCSVector(Z,indEl);//CSPointer
163    std::vector<G4double>* SPI = new std::vector<G4double>; // Pointer to the SPI vector
164    IsoProbInEl.push_back(SPI);
165    std::vector<G4int>* IsN = new std::vector<G4int>; // Pointer to the N vector
166    ElIsoN.push_back(IsN);
167    G4int nIs=cs->size();                   // A#Of Isotopes in the Element
168#ifdef debug
169    G4cout<<"G4QCohChargEx::GMFP:=***=>,#isot="<<nIs<<", Z="<<Z<<", indEl="<<indEl<<G4endl;
170#endif
171    G4double susi=0.;                       // sum of CS over isotopes
172    if(nIs) for(G4int j=0; j<nIs; j++)      // Calculate CS for eachIsotope of El
173    {
174      std::pair<G4int,G4double>* curIs=(*cs)[j]; // A pointer, which is used twice
175      G4int N=curIs->first;                 // #of Neuterons in the isotope j of El i
176      IsN->push_back(N);                    // Remember Min N for the Element
177#ifdef debug
178      G4cout<<"G4QCCX::GMFP:true, P="<<Momentum<<",Z="<<Z<<",N="<<N<<",PDG="<<pPDG<<G4endl;
179#endif
180                    G4bool ccsf=true;
181      if(Q==-27.) ccsf=false;
182#ifdef debug
183      G4cout<<"G4QCoherentChargeExchange::GMFP: GetCS #1 j="<<j<<G4endl;
184#endif
185      G4double CSI=CalculateXSt(ccsf, true, Momentum, Z, N, pPDG);// CS(j,i) for theIsotope
186
187#ifdef debug
188      G4cout<<"G4QCohChEx::GetMeanFreePath:jI="<<j<<",Zt="<<Z<<",Nt="<<N<<",Mom="<<Momentum
189            <<", XSec="<<CSI/millibarn<<G4endl;
190#endif
191      curIs->second = CSI;
192      susi+=CSI;                            // Make a sum per isotopes
193      SPI->push_back(susi);                 // Remember summed cross-section
194    } // End of temporary initialization of the cross sections in the G4QIsotope singeltone
195    sigma+=Isotopes->GetMeanCrossSection(Z,indEl)*NOfNucPerVolume[i];//SUM(MeanCS*NOfNperV)
196#ifdef debug
197    G4cout<<"G4QCohChEx::GMFP:<S>="<<Isotopes->GetMeanCrossSection(Z,indEl)<<",AddToSigma="
198          <<Isotopes->GetMeanCrossSection(Z,indEl)*NOfNucPerVolume[i]<<G4endl;
199#endif
200    ElProbInMat.push_back(sigma);
201  } // End of LOOP over Elements
202  // Check that cross section is not zero and return the mean free path
203#ifdef debug
204  G4cout<<"G4QCoherentChargeExchange::GetMeanFreePath: MeanFreePath="<<1./sigma<<G4endl;
205#endif
206  if(sigma > 0.) return 1./sigma;                 // Mean path [distance]
207  return DBL_MAX;
208}
209
210G4bool G4QCoherentChargeExchange::IsApplicable(const G4ParticleDefinition& particle) 
211{
212  if      (particle == *(        G4Proton::Proton()        )) return true;
213  else if (particle == *(       G4Neutron::Neutron()       )) return true;
214  //else if (particle == *(     G4MuonMinus::MuonMinus()     )) return true;
215  //else if (particle == *(       G4TauPlus::TauPlus()       )) return true;
216  //else if (particle == *(      G4TauMinus::TauMinus()      )) return true;
217  //else if (particle == *(      G4Electron::Electron()      )) return true;
218  //else if (particle == *(      G4Positron::Positron()      )) return true;
219  //else if (particle == *(         G4Gamma::Gamma()         )) return true;
220  //else if (particle == *(      G4MuonPlus::MuonPlus()      )) return true;
221  //else if (particle == *(G4AntiNeutrinoMu::AntiNeutrinoMu())) return true;
222  //else if (particle == *(   G4NeutrinoMu::NeutrinoMu()   )) return true;
223  //else if (particle == *(     G4PionMinus::PionMinus()     )) return true;
224  //else if (particle == *(      G4PionPlus::PionPlus()      )) return true;
225  //else if (particle == *(      G4KaonPlus::KaonPlus()      )) return true;
226  //else if (particle == *(     G4KaonMinus::KaonMinus()     )) return true;
227  //else if (particle == *(  G4KaonZeroLong::KaonZeroLong()  )) return true;
228  //else if (particle == *( G4KaonZeroShort::KaonZeroShort() )) return true;
229  //else if (particle == *(        G4Lambda::Lambda()        )) return true;
230  //else if (particle == *(     G4SigmaPlus::SigmaPlus()     )) return true;
231  //else if (particle == *(    G4SigmaMinus::SigmaMinus()    )) return true;
232  //else if (particle == *(     G4SigmaZero::SigmaZero()     )) return true;
233  //else if (particle == *(       G4XiMinus::XiMinus()       )) return true;
234  //else if (particle == *(        G4XiZero::XiZero()        )) return true;
235  //else if (particle == *(    G4OmegaMinus::OmegaMinus()    )) return true;
236  //else if (particle == *(   G4AntiNeutron::AntiNeutron()   )) return true;
237  //else if (particle == *(    G4AntiProton::AntiProton()    )) return true;
238#ifdef debug
239  G4cout<<"***>>G4QCoherChargeExch::IsApplicable: PDG="<<particle.GetPDGEncoding()<<G4endl;
240#endif
241  return false;
242}
243
244G4VParticleChange* G4QCoherentChargeExchange::PostStepDoIt(const G4Track& track,
245                                                           const G4Step& step)
246{
247  static const G4double mProt= G4QPDGCode(2212).GetMass();     // CHIPS pMass in MeV
248  static const G4double mNeut= G4QPDGCode(2212).GetMass();     // CHIPS pMass in MeV
249  //
250  //-------------------------------------------------------------------------------------
251  static G4bool CWinit = true;                       // CHIPS Warld needs to be initted
252  if(CWinit)
253                {
254    CWinit=false;
255    G4QCHIPSWorld::Get()->GetParticles(nPartCWorld); // Create CHIPS World (234 part.max)
256  }
257  //-------------------------------------------------------------------------------------
258  const G4DynamicParticle* projHadron = track.GetDynamicParticle();
259  const G4ParticleDefinition* particle=projHadron->GetDefinition();
260#ifdef debug
261  G4cout<<"G4QCohChargeExchange::PostStepDoIt: Before the GetMeanFreePath is called In4M="
262        <<projHadron->Get4Momentum()<<" of PDG="<<particle->GetPDGEncoding()<<", Type="
263        <<particle->GetParticleType()<<", Subtp="<<particle->GetParticleSubType()<<G4endl;
264#endif
265  G4ForceCondition cond=NotForced;
266  GetMeanFreePath(track, -27., &cond);                  // @@ ?? jus to update parameters?
267#ifdef debug
268  G4cout<<"G4QCohChargeExchange::PostStepDoIt: After GetMeanFreePath is called"<<G4endl;
269#endif
270  G4LorentzVector proj4M=(projHadron->Get4Momentum())/MeV; // Convert to MeV!
271  G4double momentum = projHadron->GetTotalMomentum()/MeV; // 3-momentum of the Proj in MeV
272  G4double Momentum = proj4M.rho();                   // @@ Just for the test purposes
273  if(std::fabs(Momentum-momentum)>.000001)
274       G4cerr<<"*Warning*G4QCohChEx::PostStepDoIt:P(IU)="<<Momentum<<"#"<<momentum<<G4endl;
275#ifdef pdebug
276  G4cout<<"G4QCoherentChargeExchange::PostStepDoIt: pP(IU)="<<Momentum<<"="<<momentum
277        <<",pM="<<pM<<",proj4M="<<proj4M<<proj4M.m()<<G4endl;
278#endif
279  if (!IsApplicable(*particle))  // Check applicability
280  {
281    G4cerr<<"G4QCoherentChargeExchange::PostStepDoIt: Only NA is implemented."<<G4endl;
282    return 0;
283  }
284  const G4Material* material = track.GetMaterial();      // Get the current material
285  G4int Z=0;
286  const G4ElementVector* theElementVector = material->GetElementVector();
287  G4int nE=material->GetNumberOfElements();
288#ifdef debug
289  G4cout<<"G4QCohChargeExchange::PostStepDoIt: "<<nE<<" elements in the material."<<G4endl;
290#endif
291  G4int projPDG=0;                           // PDG Code prototype for the captured hadron
292  // Not all these particles are implemented yet (see Is Applicable)
293  if      (particle ==          G4Proton::Proton()         ) projPDG= 2212;
294  else if (particle ==         G4Neutron::Neutron()        ) projPDG= 2112;
295  //else if (particle ==       G4PionMinus::PionMinus()      ) projPDG= -211;
296  //else if (particle ==        G4PionPlus::PionPlus()       ) projPDG=  211;
297  //else if (particle ==        G4KaonPlus::KaonPlus()       ) projPDG= 2112;
298  //else if (particle ==       G4KaonMinus::KaonMinus()      ) projPDG= -321;
299  //else if (particle ==    G4KaonZeroLong::KaonZeroLong()   ) projPDG=  130;
300  //else if (particle ==   G4KaonZeroShort::KaonZeroShort()  ) projPDG=  310;
301  //else if (particle ==        G4MuonPlus::MuonPlus()       ) projPDG=  -13;
302  //else if (particle ==       G4MuonMinus::MuonMinus()      ) projPDG=   13;
303  //else if (particle ==      G4NeutrinoMu::NeutrinoMu()     ) projPDG=   14;
304  //else if (particle ==  G4AntiNeutrinoMu::AntiNeutrinoMu() ) projPDG=  -14;
305  //else if (particle ==        G4Electron::Electron()       ) projPDG=   11;
306  //else if (particle ==        G4Positron::Positron()       ) projPDG=  -11;
307  //else if (particle ==       G4NeutrinoE::NeutrinoE()      ) projPDG=   12;
308  //else if (particle ==   G4AntiNeutrinoE::AntiNeutrinoE()  ) projPDG=  -12;
309  //else if (particle ==           G4Gamma::Gamma()          ) projPDG=   22;
310  //else if (particle ==         G4TauPlus::TauPlus()        ) projPDG=  -15;
311  //else if (particle ==        G4TauMinus::TauMinus()       ) projPDG=   15;
312  //else if (particle ==     G4NeutrinoTau::NeutrinoTau()    ) projPDG=   16;
313  //else if (particle == G4AntiNeutrinoTau::AntiNeutrinoTau()) projPDG=  -16;
314  //else if (particle ==          G4Lambda::Lambda()         ) projPDG= 3122;
315  //else if (particle ==       G4SigmaPlus::SigmaPlus()      ) projPDG= 3222;
316  //else if (particle ==      G4SigmaMinus::SigmaMinus()     ) projPDG= 3112;
317  //else if (particle ==       G4SigmaZero::SigmaZero()      ) projPDG= 3212;
318  //else if (particle ==         G4XiMinus::XiMinus()        ) projPDG= 3312;
319  //else if (particle ==          G4XiZero::XiZero()         ) projPDG= 3322;
320  //else if (particle ==      G4OmegaMinus::OmegaMinus()     ) projPDG= 3334;
321  //else if (particle ==     G4AntiNeutron::AntiNeutron()    ) projPDG=-2112;
322  //else if (particle ==      G4AntiProton::AntiProton()     ) projPDG=-2212;
323#ifdef debug
324  G4int prPDG=particle->GetPDGEncoding();
325                G4cout<<"G4QCohChrgExchange::PostStepDoIt: projPDG="<<projPDG<<", stPDG="<<prPDG<<G4endl;
326#endif
327  if(!projPDG)
328  {
329    G4cerr<<"*Warning*G4QCoherentChargeExchange::PostStepDoIt:UndefinedProjHadron"<<G4endl;
330    return 0;
331  }
332  //G4double pM2=proj4M.m2();        // in MeV^2
333  //G4double pM=std::sqrt(pM2);      // in MeV
334  G4double pM=mNeut;
335  G4int    fPDG=2112;
336  if(projPDG==2112)
337  {
338    pM=mProt;
339    fPDG=2212;
340  }
341  G4double pM2=pM*pM;
342                // Element treatment
343  G4int EPIM=ElProbInMat.size();
344#ifdef debug
345                G4cout<<"G4QCohChEx::PostStDoIt:m="<<EPIM<<",n="<<nE<<",T="<<ElProbInMat[EPIM-1]<<G4endl;
346#endif
347  G4int i=0;
348  if(EPIM>1)
349  {
350    G4double rnd = ElProbInMat[EPIM-1]*G4UniformRand();
351    for(i=0; i<nE; ++i)
352                  {
353#ifdef debug
354                                  G4cout<<"G4QCohChEx::PostStepDoIt:EPM["<<i<<"]="<<ElProbInMat[i]<<",r="<<rnd<<G4endl;
355#endif
356      if (rnd<ElProbInMat[i]) break;
357    }
358    if(i>=nE) i=nE-1;                        // Top limit for the Element
359  }
360  G4Element* pElement=(*theElementVector)[i];
361  Z=static_cast<G4int>(pElement->GetZ());
362#ifdef debug
363                                G4cout<<"G4QCoherentChargeExchange::PostStepDoIt: i="<<i<<", Z(element)="<<Z<<G4endl;
364#endif
365  if(Z<=0)
366  {
367    G4cerr<<"-Warning-G4QCoherentChargeExchange::PostStepDoIt: Element with Z="<<Z<<G4endl;
368    if(Z<0) return 0;
369  }
370  std::vector<G4double>* SPI = IsoProbInEl[i];// Vector of summedProbabilities for isotopes
371  std::vector<G4int>* IsN = ElIsoN[i];     // Vector of "#of neutrons" in the isotope El[i]
372  G4int nofIsot=SPI->size();               // #of isotopes in the element i
373#ifdef debug
374                G4cout<<"G4QCohChargeExchange::PosStDoIt:nI="<<nofIsot<<",T="<<(*SPI)[nofIsot-1]<<G4endl;
375#endif
376  G4int j=0;
377  if(nofIsot>1)
378  {
379    G4double rndI=(*SPI)[nofIsot-1]*G4UniformRand(); // Randomize the isotop of the Element
380    for(j=0; j<nofIsot; ++j)
381    {
382#ifdef debug
383                                  G4cout<<"G4QCohChargEx::PostStepDoIt: SP["<<j<<"]="<<(*SPI)[j]<<", r="<<rndI<<G4endl;
384#endif
385      if(rndI < (*SPI)[j]) break;
386    }
387    if(j>=nofIsot) j=nofIsot-1;            // Top limit for the isotope
388  }
389  G4int N =(*IsN)[j]; ;                    // Randomized number of neutrons
390#ifdef debug
391                G4cout<<"G4QCohChargeEx::PostStepDoIt: j="<<i<<", N(isotope)="<<N<<", MeV="<<MeV<<G4endl;
392#endif
393  if(N<0)
394  {
395    G4cerr<<"*Warning*G4QCohChEx::PostStepDoIt: Isotope with Z="<<Z<<", 0>N="<<N<<G4endl;
396    return 0;
397  }
398  nOfNeutrons=N;                           // Remember it for the energy-momentum check
399#ifdef debug
400  G4cout<<"G4QCohChargeExchange::PostStepDoIt: N="<<N<<" for element with Z="<<Z<<G4endl;
401#endif
402  if(N<0)
403  {
404    G4cerr<<"*Warning*G4QCoherentChargeExchange::PostStepDoIt:Element with N="<<N<< G4endl;
405    return 0;
406  }
407  aParticleChange.Initialize(track);
408#ifdef debug
409  G4cout<<"G4QCoherentChargeExchange::PostStepDoIt: track is initialized"<<G4endl;
410#endif
411  G4double      weight    = track.GetWeight();
412  G4double      localtime = track.GetGlobalTime();
413  G4ThreeVector position  = track.GetPosition();
414#ifdef debug
415  G4cout<<"G4QCoherentChargeExchange::PostStepDoIt: before Touchable extraction"<<G4endl;
416#endif
417  G4TouchableHandle trTouchable = track.GetTouchableHandle();
418#ifdef debug
419  G4cout<<"G4QCoherentChargeExchange::PostStepDoIt: Touchable is extracted"<<G4endl;
420#endif
421  //
422  G4int targPDG=90000000+Z*1000+N;         // CHIPS PDG Code of the target nucleus
423  if(projPDG==2212) targPDG+=999;          // convert to final nucleus code
424  else if(projPDG==2112) targPDG-=999;
425  G4QPDGCode targQPDG(targPDG);            // @@ use G4Ion and get rid of CHIPS World
426  G4double tM=targQPDG.GetMass();          // CHIPS final nucleus mass in MeV
427  G4double kinEnergy= projHadron->GetKineticEnergy()*MeV; // Kin energy in MeV (Is *MeV n?)
428  G4ParticleMomentum dir = projHadron->GetMomentumDirection();// It is a unit three-vector
429  G4LorentzVector tot4M=proj4M+G4LorentzVector(0.,0.,0.,tM); // Total 4-mom of the reaction
430#ifdef debug
431  G4cout<<"G4QCohChrgEx::PostStepDoIt: tM="<<tM<<", p4M="<<proj4M<<", t4M="<<tot4M<<G4endl;
432#endif
433  EnMomConservation=tot4M;                 // Total 4-mom of reaction for E/M conservation
434  // @@ Probably this is not necessary any more
435#ifdef debug
436  G4cout<<"G4QCCX::PSDI:false, P="<<Momentum<<",Z="<<Z<<",N="<<N<<",PDG="<<projPDG<<G4endl;
437#endif
438  G4double xSec=CalculateXSt(false, true, Momentum, Z, N, projPDG); // Recalc. CrossSection
439#ifdef debug
440  G4cout<<"G4QCoChEx::PSDI:PDG="<<projPDG<<",P="<<Momentum<<",CS="<<xSec/millibarn<<G4endl;
441#endif
442#ifdef nandebug
443  if(xSec>0. || xSec<0. || xSec==0);
444  else  G4cout<<"*Warning*G4QCohChargeExchange::PSDI: xSec="<<xSec/millibarn<<G4endl;
445#endif
446  // @@ check a possibility to separate p, n, or alpha (!)
447  if(xSec <= 0.) // The cross-section iz 0 -> Do Nothing
448  {
449#ifdef pdebug
450    G4cerr<<"*Warning*G4QCoherentChargeExchange::PSDoIt:*Zero cross-section* PDG="<<projPDG
451          <<",tPDG="<<targPDG<<",P="<<Momentum<<G4endl;
452#endif
453    //Do Nothing Action insead of the reaction
454    aParticleChange.ProposeEnergy(kinEnergy);
455    aParticleChange.ProposeLocalEnergyDeposit(0.);
456    aParticleChange.ProposeMomentumDirection(dir) ;
457    return G4VDiscreteProcess::PostStepDoIt(track,step);
458  }
459  G4double mint=CalculateXSt(false, false, Momentum, Z, N, projPDG);// randomize t in MeV^2
460#ifdef pdebug
461  G4cout<<"G4QCohChEx::PoStDoIt:pPDG="<<projPDG<<",tPDG="<<targPDG<<",P="<<Momentum<<",CS="
462        <<xSec<<",-t="<<mint<<G4endl;
463#endif
464#ifdef nandebug
465  if(mint>-.0000001);
466  else  G4cout<<"*Warning*G4QCoherentChargeExchange::PostStDoIt:-t="<<mint<<G4endl;
467#endif
468  G4double maxt=CalculateXSt(true, false, Momentum, Z, N, projPDG);
469  if(maxt<=0.) maxt=1.e-27;
470  G4double cost=1.-mint/maxt; // cos(theta) in CMS (@@ we neglect mass diff for ChEx)
471  //
472#ifdef ppdebug
473  G4cout<<"G4QCoherentChargeExchange::PoStDoIt:t="<<mint<<",dpcm2="<<maxt
474        <<",Ek="<<kinEnergy<<",tM="<<tM<<",pM="<<pM<<",cost="<<cost<<G4endl;
475#endif
476  if(cost>1. || cost<-1. || !(cost>-1. || cost<1.))
477  {
478    if(cost>1.000001 || cost<-1.000001 || !(cost>-1. || cost<1.))
479    {
480      G4double tM2=tM*tM;                         // Squared target mass
481      G4double pEn=pM+kinEnergy;                  // tot projectile Energy in MeV
482      G4double sM=(tM+tM)*pEn+tM2+pM2;            // Mondelstam s
483      G4double twop2cm=(tM2+tM2)*(pEn*pEn-pM2)/sM;// Max_t/2 (2*p^2_cm)
484      G4cout<<"*Warning*G4QCohChEx::PostStepDoIt:cos="<<cost<<",t="<<mint<<",T="<<kinEnergy
485            <<",tM="<<tM<<",tmax="<<2*kinEnergy*tM<<",p="<<projPDG<<",t="<<targPDG<<G4endl;
486      G4cout<<"..G4QCohChEx::PoStDoI: dpcm2="<<twop2cm<<"="<<maxt<<G4endl;
487    }
488    if     (cost>1.)  cost=1.;
489    else if(cost<-1.) cost=-1.;
490  }
491  G4LorentzVector reco4M=G4LorentzVector(0.,0.,0.,tM);      // 4mom of the recoil target
492  G4LorentzVector scat4M=G4LorentzVector(0.,0.,0.,pM);      // 4mom of the recoil target
493  G4LorentzVector dir4M=tot4M-G4LorentzVector(0.,0.,0.,(tot4M.e()-tM-pM)*.01);
494  if(!G4QHadron(tot4M).RelDecayIn2(scat4M, reco4M, dir4M, cost, cost))
495  {
496    G4cerr<<"G4QCohChEx::PSDI:t4M="<<tot4M<<",pM="<<pM<<",tM="<<tM<<",cost="<<cost<<G4endl;
497    //G4Exception("G4QCoherentChargeExchange::PostStepDoIt:","009",FatalException,"Decay");
498  }
499#ifdef debug
500  G4cout<<"G4QCohChEx::PoStDoIt:s4M="<<scat4M<<"+r4M="<<reco4M<<"="<<scat4M+reco4M<<G4endl;
501  G4cout<<"G4QCohChEx::PoStDoIt: scatE="<<scat4M.e()-pM<<", recoE="<<reco4M.e()-tM<<",d4M="
502        <<tot4M-scat4M-reco4M<<G4endl;
503#endif
504  // Kill scattered hadron
505  aParticleChange.ProposeTrackStatus(fStopAndKill);
506  // Definition of the scattered nucleon
507                G4DynamicParticle* theSec = new G4DynamicParticle; // A secondary for the recoil hadron
508  G4ParticleDefinition* theDefinition=G4Proton::Proton();
509  if(projPDG==2212) theDefinition=G4Neutron::Neutron();
510  theSec->SetDefinition(theDefinition);
511  EnMomConservation-=scat4M;
512  theSec->Set4Momentum(scat4M);
513  G4Track* aNewTrack = new G4Track(theSec, localtime, position );
514  aNewTrack->SetWeight(weight);                                   //    weighted
515  aNewTrack->SetTouchableHandle(trTouchable);
516  aParticleChange.AddSecondary( aNewTrack );
517  // Filling the recoil nucleus
518                theSec = new G4DynamicParticle; // A secondary for the recoil hadron
519  G4int aA = Z+N;
520#ifdef pdebug
521                G4cout<<"G4QCoherentChargeExchange::PostStepDoIt: Ion Z="<<Z<<", A="<<aA<<G4endl;
522#endif
523  theDefinition=G4ParticleTable::GetParticleTable()->FindIon(Z,aA,0,Z);
524  if(!theDefinition)G4cout<<"*Warning*G4QCohChEx::PostStepDoIt:drop PDG="<<targPDG<<G4endl;
525#ifdef pdebug
526  G4cout<<"G4QCohChEx::PostStepDoIt:RecoilName="<<theDefinition->GetParticleName()<<G4endl;
527#endif
528  theSec->SetDefinition(theDefinition);
529  EnMomConservation-=reco4M;
530#ifdef tdebug
531  G4cout<<"G4QCohChEx::PostSDoIt:"<<targPDG<<reco4M<<reco4M.m()<<EnMomConservation<<G4endl;
532#endif
533  theSec->Set4Momentum(reco4M);
534#ifdef debug
535  G4ThreeVector curD=theSec->GetMomentumDirection();
536  G4double curM=theSec->GetMass();
537  G4double curE=theSec->GetKineticEnergy()+curM;
538  G4cout<<"G4QCohChEx::PostStpDoIt:p="<<curD<<curD.mag()<<",e="<<curE<<",m="<<curM<<G4endl;
539#endif
540  // Make a recoil nucleus
541  aNewTrack = new G4Track(theSec, localtime, position );
542  aNewTrack->SetWeight(weight);                                   //    weighted
543  aNewTrack->SetTouchableHandle(trTouchable);
544  aParticleChange.AddSecondary( aNewTrack );
545#ifdef debug
546    G4cout<<"G4QCoherentChargeExchange::PostStepDoIt:*** PostStepDoIt is done ***"<<G4endl;
547#endif
548  return G4VDiscreteProcess::PostStepDoIt(track, step);
549}
550
551G4double G4QCoherentChargeExchange::CalculateXSt(G4bool oxs, G4bool xst, G4double p,
552                                                 G4int Z, G4int N, G4int pPDG) 
553{
554  static G4bool init=false;
555  static G4bool first=true;
556  static G4VQCrossSection* CSmanager;
557  G4QuasiFreeRatios* qfMan=G4QuasiFreeRatios::GetPointer();
558  if(first)                              // Connection with a singletone
559  {
560    CSmanager=G4QElasticCrossSection::GetPointer();
561    first=false;
562  }
563  G4double res=0.;
564  if(oxs && xst)                         // Only the Cross-Section can be returened
565  {
566    res=CSmanager->GetCrossSection(true, p, Z, N, pPDG); // XS for isotope
567    res*=qfMan->ChExElCoef(p*MeV, Z, N, pPDG);
568  }
569  else if(!oxs && xst)                   // Calculate Cross-Section & prepare differential
570  {
571    res=CSmanager->GetCrossSection(false, p, Z, N, pPDG);// XS for isotope + init t-distr.
572    res*=qfMan->ChExElCoef(p*MeV, Z, N, pPDG);
573    // The XS for the nucleus must be calculated the last
574    init=true;
575  }
576  else if(init)                          // Return t-value for scattering (=G4QElastic)
577  {
578    if(oxs) res=CSmanager->GetHMaxT();   // Calculate the max_t value
579                                else res=CSmanager->GetExchangeT(Z, N, pPDG); // fanctionally randomized -t in MeV^2
580  }
581  else G4cout<<"*Warning*G4QCohChrgExchange::CalculateXSt: NotInitiatedScattering"<<G4endl;
582  return res;
583}
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