source: trunk/source/processes/hadronic/models/chiral_inv_phase_space/interface/src/G4QIonIonElastic.cc @ 1055

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26// $Id: G4QIonIonElastic.cc,v 1.4 2009/02/23 09:49:24 mkossov Exp $
27// GEANT4 tag $Name: geant4-09-03-beta-cand-01 $
28//
29//      ---------------- G4QIonIonElastic class -----------------
30//                 by Mikhail Kossov, December 2006.
31// G4QIonIonElastic class of the CHIPS Simulation Branch in GEANT4
32// ---------------------------------------------------------------
33// ****************************************************************************************
34// ********** This CLASS is temporary moved from the photolepton_hadron directory *********
35// ****************************************************************************************
36// Short description: a simple process for the Ion-Ion elastic scattering.
37// For heavy by heavy ions it can reach 50% of the total cross-section.
38// -----------------------------------------------------------------------
39
40//#define debug
41//#define pdebug
42//#define tdebug
43//#define nandebug
44//#define ppdebug
45
46#include "G4QIonIonElastic.hh"
47
48// Initialization of static vectors
49G4int G4QIonIonElastic::nPartCWorld=152;     // The#of particles initialized in CHIPS World
50std::vector<G4int> G4QIonIonElastic::ElementZ;        // Z of the element(i) in theLastCalc
51std::vector<G4double> G4QIonIonElastic::ElProbInMat;  // SumProbabilityElements in Material
52std::vector<std::vector<G4int>*> G4QIonIonElastic::ElIsoN; // N of isotope(j) of Element(i)
53std::vector<std::vector<G4double>*>G4QIonIonElastic::IsoProbInEl;//SumProbabIsotopes in ElI
54
55// Constructor
56G4QIonIonElastic::G4QIonIonElastic(const G4String& processName):
57  G4VDiscreteProcess(processName, fHadronic)
58{
59#ifdef debug
60  G4cout<<"G4QIonIonElastic::Constructor is called processName="<<processName<<G4endl;
61#endif
62  if (verboseLevel>0) G4cout << GetProcessName() << " process is created "<< G4endl;
63  SetProcessSubType(fHadronElastic);
64  //G4QCHIPSWorld::Get()->GetParticles(nPartCWorld); // Create CHIPS World (234 part. max)
65}
66
67// Destructor
68G4QIonIonElastic::~G4QIonIonElastic() {}
69
70// output of the function must be in units of length! L=1/sig_V,sig_V=SUM(n(j,i)*sig(j,i)),
71// where n(i,j) is a number of nuclei of the isotop j of the element i in V=1(lengtUnit^3)
72// ********** All CHIPS cross sections are calculated in the surface units ************
73G4double G4QIonIonElastic::GetMeanFreePath(const G4Track& aTrack, G4double,
74                                           G4ForceCondition* Fc)
75{
76  *Fc = NotForced;
77  const G4DynamicParticle* incidentParticle = aTrack.GetDynamicParticle();
78  G4ParticleDefinition* incidentParticleDefinition=incidentParticle->GetDefinition();
79  if( !IsApplicable(*incidentParticleDefinition))
80    G4cout<<"-Warning-G4QIonIonElastic::GetMeanFreePath: notImplementedParticle"<<G4endl;
81  // Calculate the mean Cross Section for the set of Elements(*Isotopes) in the Material
82  G4double Momentum = incidentParticle->GetTotalMomentum(); // 3-momentum of the Particle
83#ifdef debug
84  G4double KinEn = incidentParticle->GetKineticEnergy();
85  G4cout<<"G4QIonIonElastic::GetMeanFreePath: kinE="<<KinEn<<",Mom="<<Momentum<<G4endl;
86#endif
87  const G4Material* material = aTrack.GetMaterial();        // Get the current material
88  const G4double* NOfNucPerVolume = material->GetVecNbOfAtomsPerVolume();
89  const G4ElementVector* theElementVector = material->GetElementVector();
90  G4int nE=material->GetNumberOfElements();
91#ifdef debug
92  G4cout<<"G4QIonIonElastic::GetMeanFreePath:"<<nE<<" Elem's in theMaterial"<<G4endl;
93#endif
94  G4VQCrossSection* CSmanager=G4QIonIonCrossSection::GetPointer();
95  G4int pPDG=0;
96  // Probably enough: pPDG=incidentParticleDefinition->GetPDGEncoding();
97  if      ( incidentParticleDefinition ==  G4Deuteron::Deuteron()     ) pPDG = 100001002;
98  else if ( incidentParticleDefinition ==  G4Alpha::Alpha()           ) pPDG = 100002004;
99  else if ( incidentParticleDefinition ==  G4Triton::Triton()         ) pPDG = 100001003;
100  else if ( incidentParticleDefinition ==  G4He3::He3()               ) pPDG = 100002003;
101  else if ( incidentParticleDefinition ==  G4GenericIon::GenericIon() )
102  {
103    pPDG=incidentParticleDefinition->GetPDGEncoding();
104#ifdef debug
105    G4int B=incidentParticleDefinition->GetBaryonNumber();
106    G4int C=incidentParticleDefinition->GetPDGCharge();
107    prPDG=100000000+1000*C+B;
108    G4cout<<"G4QIonIonElastic::GetMeanFreePath: PDG="<<prPDG<<"="<<pPDG<<G4endl;
109#endif
110  }
111  else G4cout<<"-Warning-G4QIonIonElastic::GetMeanFreePath:Unknown projectile Ion"<<G4endl;
112  Momentum/=incidentParticleDefinition->GetBaryonNumber(); // Divide Mom by projectile A
113  G4QIsotope* Isotopes = G4QIsotope::Get(); // Pointer to the G4QIsotopes singleton
114  G4double sigma=0.;                        // Sums over elements for the material
115  G4int IPIE=IsoProbInEl.size();            // How many old elements?
116  if(IPIE) for(G4int ip=0; ip<IPIE; ++ip)   // Clean up the SumProb's of Isotopes (SPI)
117  {
118    std::vector<G4double>* SPI=IsoProbInEl[ip]; // Pointer to the SPI vector
119    SPI->clear();
120    delete SPI;
121    std::vector<G4int>* IsN=ElIsoN[ip];     // Pointer to the N vector
122    IsN->clear();
123    delete IsN;
124  }
125  ElProbInMat.clear();                      // Clean up the SumProb's of Elements (SPE)
126  ElementZ.clear();                         // Clear the body vector for Z of Elements
127  IsoProbInEl.clear();                      // Clear the body vector for SPI
128  ElIsoN.clear();                           // Clear the body vector for N of Isotopes
129  for(G4int i=0; i<nE; ++i)
130  {
131    G4Element* pElement=(*theElementVector)[i]; // Pointer to the current element
132    G4int Z = static_cast<G4int>(pElement->GetZ()); // Z of the Element
133    ElementZ.push_back(Z);                  // Remember Z of the Element
134    G4int isoSize=0;                        // The default for the isoVectorLength is 0
135    G4int indEl=0;                          // Index of non-natural element or 0(default)
136    G4IsotopeVector* isoVector=pElement->GetIsotopeVector(); // Get the predefined IsoVect
137    if(isoVector) isoSize=isoVector->size();// Get size of the existing isotopeVector
138#ifdef debug
139    G4cout<<"G4QIonIonElastic::GetMeanFreePath: isovectorLength="<<isoSize<<G4endl;
140#endif
141    if(isoSize)                             // The Element has non-trivial abundance set
142    {
143      indEl=pElement->GetIndex()+1;         // Index of the non-trivial element is an order
144#ifdef debug
145      G4cout<<"G4QIIEl::GetMFP:iE="<<indEl<<", def="<<Isotopes->IsDefined(Z,indEl)<<G4endl;
146#endif
147      if(!Isotopes->IsDefined(Z,indEl))     // This index is not defined for this Z: define
148      {
149        std::vector<std::pair<G4int,G4double>*>* newAbund =
150                                               new std::vector<std::pair<G4int,G4double>*>;
151        G4double* abuVector=pElement->GetRelativeAbundanceVector();
152        for(G4int j=0; j<isoSize; j++)      // Calculation of abundance vector for isotopes
153        {
154          G4int N=pElement->GetIsotope(j)->GetN()-Z; // N means A=N+Z !
155          if(pElement->GetIsotope(j)->GetZ()!=Z) G4cerr<<"G4QIonIonEl::GetMeanFreePath Z="
156                                         <<pElement->GetIsotope(j)->GetZ()<<"#"<<Z<<G4endl;
157          G4double abund=abuVector[j];
158          std::pair<G4int,G4double>* pr= new std::pair<G4int,G4double>(N,abund);
159#ifdef debug
160          G4cout<<"G4QIonIonElastic::GetMeanFP:pair#="<<j<<",N="<<N<<",ab="<<abund<<G4endl;
161#endif
162          newAbund->push_back(pr);
163        }
164#ifdef debug
165        G4cout<<"G4QIonIonElastic::GetMeanFP: pairVectorLength="<<newAbund->size()<<G4endl;
166#endif
167        indEl=G4QIsotope::Get()->InitElement(Z,indEl,newAbund); // definition of the newInd
168        for(G4int k=0; k<isoSize; k++) delete (*newAbund)[k];   // Cleaning temporary
169        delete newAbund; // Was "new" in the beginning of the name space
170      }
171    }
172    std::vector<std::pair<G4int,G4double>*>* cs= Isotopes->GetCSVector(Z,indEl);//CSPointer
173    std::vector<G4double>* SPI = new std::vector<G4double>; // Pointer to the SPI vector
174    IsoProbInEl.push_back(SPI);
175    std::vector<G4int>* IsN = new std::vector<G4int>; // Pointer to the N vector
176    ElIsoN.push_back(IsN);
177    G4int nIs=cs->size();                   // A#Of Isotopes in the Element
178#ifdef debug
179    G4cout<<"G4QIonIonEl::GetMFP:=***=> #isot="<<nIs<<", Z="<<Z<<", indEl="<<indEl<<G4endl;
180#endif
181    G4double susi=0.;                       // sum of CS over isotopes
182    if(nIs) for(G4int j=0; j<nIs; j++)      // Calculate CS for eachIsotope of El
183    {
184      std::pair<G4int,G4double>* curIs=(*cs)[j]; // A pointer, which is used twice
185      G4int N=curIs->first;                 // #of Neuterons in the isotope j of El i
186      IsN->push_back(N);                    // Remember Min N for the Element
187#ifdef debug
188      G4cout<<"G4QIIEl::GMFP:true,P="<<Momentum<<",Z="<<Z<<",N="<<N<<",PDG="<<pPDG<<G4endl;
189#endif
190      G4bool ccsf=false;                    // Extract elastic Ion-Ion cross-section
191#ifdef debug
192      G4cout<<"G4QIonIonElastic::GMFP: GetCS #1 j="<<j<<G4endl;
193#endif
194      G4double CSI=CSmanager->GetCrossSection(ccsf,Momentum,Z,N,pPDG);//CS(j,i) for isotope
195#ifdef debug
196      G4cout<<"G4QIonIonElastic::GMFP: jI="<<j<<", Zt="<<Z<<", Nt="<<N<<", Mom="<<Momentum
197            <<", XSec="<<CSI/millibarn<<G4endl;
198#endif
199      curIs->second = CSI;
200      susi+=CSI;                            // Make a sum per isotopes
201      SPI->push_back(susi);                 // Remember summed cross-section
202    } // End of temporary initialization of the cross sections in the G4QIsotope singeltone
203    sigma+=Isotopes->GetMeanCrossSection(Z,indEl)*NOfNucPerVolume[i];//SUM(MeanCS*NOfNperV)
204#ifdef debug
205    G4cout<<"G4QIonIonEl::GMFP:<S>="<<Isotopes->GetMeanCrossSection(Z,indEl)<<",AddToSig="
206          <<Isotopes->GetMeanCrossSection(Z,indEl)*NOfNucPerVolume[i]<<G4endl;
207#endif
208    ElProbInMat.push_back(sigma);
209  } // End of LOOP over Elements
210  // Check that cross section is not zero and return the mean free path
211#ifdef debug
212  G4cout<<"G4QIonIonElastic::GetMeanFreePath: MeanFreePath="<<1./sigma<<G4endl;
213#endif
214  if(sigma > 0.) return 1./sigma;                 // Mean path [distance]
215  return DBL_MAX;
216}
217
218
219G4bool G4QIonIonElastic::IsApplicable(const G4ParticleDefinition& particle) 
220{
221  if      (particle == *( G4Deuteron::Deuteron()     )) return true;
222  else if (particle == *( G4Alpha::Alpha()           )) return true;
223  else if (particle == *( G4Triton::Triton()         )) return true;
224  else if (particle == *( G4He3::He3()               )) return true;
225  else if (particle == *( G4GenericIon::GenericIon() )) return true;
226#ifdef debug
227  G4cout<<"***>>G4QIonIonElastic::IsApplicable: PDG="<<particle.GetPDGEncoding()<<G4endl;
228#endif
229  return false;
230}
231
232G4VParticleChange* G4QIonIonElastic::PostStepDoIt(const G4Track& track, const G4Step& step)
233{
234  static const G4double fm2MeV2 = 3*38938./1.09; // (3/1.09)*(hc)^2 in fm^2*MeV^2
235  static G4bool CWinit = true;                   // CHIPS Warld needs to be initted
236  if(CWinit)
237  {
238    CWinit=false;
239    G4QCHIPSWorld::Get()->GetParticles(nPartCWorld); // Create CHIPS World (234 part.max)
240  }
241  //-------------------------------------------------------------------------------------
242  const G4DynamicParticle* projHadron = track.GetDynamicParticle();
243  const G4ParticleDefinition* particle=projHadron->GetDefinition();
244#ifdef debug
245  G4cout<<"G4QIonIonElastic::PostStepDoIt: Before the GetMeanFreePath is called In4M="
246        <<projHadron->Get4Momentum()<<" of PDG="<<particle->GetPDGEncoding()<<", Type="
247        <<particle->GetParticleType()<<", Subtp="<<particle->GetParticleSubType()<<G4endl;
248#endif
249  //G4ForceCondition cond=NotForced;
250  //GetMeanFreePath(track, -27., &cond);                // @@ ?? jus to update parameters?
251#ifdef debug
252  G4cout<<"G4QIonIonElastic::PostStepDoIt: After the GetMeanFreePath is called"<<G4endl;
253#endif
254  G4LorentzVector proj4M=(projHadron->Get4Momentum())/MeV; // Convert to MeV!
255  G4LorentzVector scat4M=proj4M;                      // @@ Must be filled (?)
256  G4double momentum = projHadron->GetTotalMomentum()/MeV; // 3-momentum of the Proj in MeV
257  G4double Momentum = proj4M.rho();                   // @@ Just for the test purposes
258  if(std::fabs(Momentum-momentum)>.000001)
259    G4cerr<<"-Warn-G4QIonIonElastic::PostStepDoIt:P(IU)="<<Momentum<<"#"<<momentum<<G4endl;
260  G4double pM2=proj4M.m2();        // in MeV^2
261  G4double pM=std::sqrt(pM2);      // in MeV
262#ifdef pdebug
263  G4cout<<"G4QIonIonElastic::PostStepDoIt: pP(IU)="<<Momentum<<"="<<momentum<<",pM="<<pM
264        <<",scat4M="<<scat4M<<scat4M.m()<<G4endl;
265#endif
266  if (!IsApplicable(*particle))  // Check applicability
267  {
268    G4cerr<<"G4QIonIonElastic::PostStepDoIt: Only NA elastic is implemented."<<G4endl;
269    return 0;
270  }
271  const G4Material* material = track.GetMaterial();      // Get the current material
272  G4int Z=0;
273  const G4ElementVector* theElementVector = material->GetElementVector();
274  G4int nE=material->GetNumberOfElements();
275#ifdef debug
276  G4cout<<"G4QIonIonElastic::PostStepDoIt: "<<nE<<" elements in the material."<<G4endl;
277#endif
278  // Probably enough: projPDG=particle->GetPDGEncoding();
279  G4int projPDG=0;                           // CHIPS PDG Code for the captured hadron
280  if      (particle ==  G4Deuteron::Deuteron()     ) projPDG= 100001002;
281  else if (particle ==  G4Alpha::Alpha()           ) projPDG= 100002004;
282  else if (particle ==  G4Triton::Triton()         ) projPDG= 100001003;
283  else if (particle ==  G4He3::He3()               ) projPDG= 100002003;
284  else if (particle ==  G4GenericIon::GenericIon() )
285  {
286    projPDG=particle->GetPDGEncoding();
287#ifdef debug
288    G4int B=particle->GetBaryonNumber();
289    G4int C=particle->GetPDGCharge();
290    prPDG=100000000+1000*C+B;
291    G4cout<<"G4QIonIonElastic::PostStepDoIt: PDG="<<prPDG<<"="<<projPDG<<G4endl;
292#endif
293  }
294  else G4cout<<"-Warning-G4QIonIonElastic::PostStepDoIt:Unknown projectile Ion"<<G4endl;
295#ifdef debug
296  G4int prPDG=particle->GetPDGEncoding();
297  G4cout<<"G4QIonIonElastic::PostStepDoIt: projPDG="<<projPDG<<", stPDG="<<prPDG<<G4endl;
298#endif
299  if(!projPDG)
300  {
301    G4cerr<<"-Warning-G4QIonIonElastic::PostStepDoIt:Undefined interactingNucleus"<<G4endl;
302    return 0;
303  }
304  G4double pA=particle->GetBaryonNumber();     // Projectile A
305  G4double pZ=particle->GetPDGCharge();        // Projectile Z
306  G4double pN=pA-pZ;                           // Projectile N
307  G4int EPIM=ElProbInMat.size();
308#ifdef debug
309  G4cout<<"G4QIonIonElastic::PSDI:m="<<EPIM<<",n="<<nE<<",T="<<ElProbInMat[EPIM-1]<<G4endl;
310#endif
311  G4int i=0;
312  if(EPIM>1)
313  {
314    G4double rnd = ElProbInMat[EPIM-1]*G4UniformRand();
315    for(i=0; i<nE; ++i)
316    {
317#ifdef debug
318      G4cout<<"G4QIonIonElastic::PSDI: EPM["<<i<<"]="<<ElProbInMat[i]<<", r="<<rnd<<G4endl;
319#endif
320      if (rnd<ElProbInMat[i]) break;
321    }
322    if(i>=nE) i=nE-1;                        // Top limit for the Element
323  }
324  G4Element* pElement=(*theElementVector)[i];
325  Z=static_cast<G4int>(pElement->GetZ());
326#ifdef debug
327    G4cout<<"G4QIonIonElastic::PostStepDoIt: i="<<i<<", Z(element)="<<Z<<G4endl;
328#endif
329  if(Z<=0)
330  {
331    G4cerr<<"---Warning---G4QIonIonElastic::PostStepDoIt: Element with Z="<<Z<<G4endl;
332    if(Z<0) return 0;
333  }
334  std::vector<G4double>* SPI = IsoProbInEl[i];// Vector of summedProbabilities for isotopes
335  std::vector<G4int>* IsN = ElIsoN[i];     // Vector of "#of neutrons" in the isotope El[i]
336  G4int nofIsot=SPI->size();               // #of isotopes in the element i
337#ifdef debug
338  G4cout<<"G4QIonIonElastic::PosStDoIt: nI="<<nofIsot<<",T="<<(*SPI)[nofIsot-1]<<G4endl;
339#endif
340  G4int j=0;
341  if(nofIsot>1)
342  {
343    G4double rndI=(*SPI)[nofIsot-1]*G4UniformRand(); // Randomize the isotop of the Element
344    for(j=0; j<nofIsot; ++j)
345    {
346#ifdef debug
347      G4cout<<"G4QIonIonElastic::PostStDI: SP["<<j<<"]="<<(*SPI)[j]<<", r="<<rndI<<G4endl;
348#endif
349      if(rndI < (*SPI)[j]) break;
350    }
351    if(j>=nofIsot) j=nofIsot-1;            // Top limit for the isotope
352  }
353  G4int N =(*IsN)[j]; ;                    // Randomized number of neutrons
354#ifdef debug
355  G4cout<<"G4QIonIonElastic::PostStepDoIt:j="<<i<<",N(isotope)="<<N<<", MeV="<<MeV<<G4endl;
356#endif
357  if(N<0)
358  {
359    G4cerr<<"-Warning-G4QIonIonElastic::PostStepDoIt:IsotopeZ="<<Z<<" has 0>N="<<N<<G4endl;
360    return 0;
361  }
362  nOfNeutrons=N;                           // Remember it for the energy-momentum check
363#ifdef debug
364  G4cout<<"G4QIonIonElastic::PostStepDoIt: N="<<N<<" for element with Z="<<Z<<G4endl;
365#endif
366  if(N<0)
367  {
368    G4cerr<<"-Warning-G4QIonIonElastic::PostStepDoIt:Element with N="<<N<< G4endl;
369    return 0;
370  }
371  aParticleChange.Initialize(track);
372#ifdef debug
373  G4cout<<"G4QIonIonElastic::PostStepDoIt: track is initialized"<<G4endl;
374#endif
375  G4double weight        = track.GetWeight();
376  G4double localtime     = track.GetGlobalTime();
377  G4ThreeVector position = track.GetPosition();
378#ifdef debug
379  G4cout<<"G4QIonIonElastic::PostStepDoIt: before Touchable extraction"<<G4endl;
380#endif
381  G4TouchableHandle trTouchable = track.GetTouchableHandle();
382#ifdef debug
383  G4cout<<"G4QIonIonElastic::PostStepDoIt: Touchable is extracted"<<G4endl;
384#endif
385  //
386  G4double tA=Z+N;
387  G4int targPDG=90000000+Z*1000+N;         // CHIPS PDG Code of the target nucleus
388  G4QPDGCode targQPDG(targPDG);            // @@ one can use G4Ion & get rid of CHIPS World
389  G4double tM=targQPDG.GetMass();          // CHIPS target mass in MeV
390  G4double kinEnergy= projHadron->GetKineticEnergy()*MeV; // Kin energy in MeV (Is *MeV n?)
391  G4ParticleMomentum dir = projHadron->GetMomentumDirection();// It is a unit three-vector
392  G4LorentzVector tot4M=proj4M+G4LorentzVector(0.,0.,0.,tM); // Total 4-mom of the reaction
393#ifdef debug
394  G4cout<<"G4QIonIonElastic::PostStDI: tM="<<tM<<", p4M="<<proj4M<<", t4M="<<tot4M<<G4endl;
395#endif
396  EnMomConservation=tot4M;                 // Total 4-mom of reaction for E/M conservation
397  G4VQCrossSection* ELmanager=G4QElasticCrossSection::GetPointer();
398  G4VQCrossSection* CSmanager=G4QIonIonCrossSection::GetPointer();
399  // @@ Probably this is not necessary any more
400#ifdef debug
401  G4cout<<"G4QIIEl::PSDI:false,P="<<Momentum<<",Z="<<Z<<",N="<<N<<",PDG="<<projPDG<<G4endl;
402#endif
403  // false means elastic cross-section
404  G4double xSec=CSmanager->GetCrossSection(false, Momentum, Z, N, projPDG);// Rec.CrossSect
405#ifdef debug
406  G4cout<<"G4QIIEl::PSDI: pPDG="<<projPDG<<",P="<<Momentum<<",CS="<<xSec/millibarn<<G4endl;
407#endif
408#ifdef nandebug
409  if(xSec>0. || xSec<0. || xSec==0);
410  else  G4cout<<"-NaN-Warning-G4QIonIonElastic::PostStDoIt: xSec="<<xSec/millibarn<<G4endl;
411#endif
412  // @@ check a possibility to separate p, n, or alpha (!)
413  if(xSec <= 0.) // The cross-section iz 0 -> Do Nothing
414  {
415#ifdef pdebug
416    G4cerr<<"-Warning-G4QIonIonElastic::PostStDoIt: *Zero cross-section* PDG="<<projPDG
417          <<",tPDG="<<targPDG<<",P="<<Momentum<<G4endl;
418#endif
419    //Do Nothing Action insead of the reaction
420    aParticleChange.ProposeEnergy(kinEnergy);
421    aParticleChange.ProposeLocalEnergyDeposit(0.);
422    aParticleChange.ProposeMomentumDirection(dir) ;
423    return G4VDiscreteProcess::PostStepDoIt(track,step);
424  }
425  G4double dtM=tM+tM;
426  G4double PA=Momentum*pA;
427  G4double PA2=PA*PA;
428  G4double maxt=dtM*PA2/(std::sqrt(PA2+pM2)+tM/2+pM2/dtM);
429#ifdef pdebug
430  G4cout<<"G4QIonIonElastic::PostStDoIt:pPDG="<<projPDG<<",tPDG="<<targPDG<<",P="<<Momentum
431        <<",CS="<<xSec<<",maxt="<<maxt<<G4endl;
432#endif
433  xSec=ELmanager->GetCrossSection(false, Momentum, 1, 0, 2212);// pp=nn
434  G4double B1=ELmanager->GetSlope(1,0,2212); // slope for pp=nn
435  xSec=ELmanager->GetCrossSection(false, Momentum, 1, 0, 2112);// np=pn
436  G4double B2 =ELmanager->GetSlope(1,0,2112); // slope for np=pn
437  G4double mB =((pZ*Z+pN*N)*B1+(pZ*N+pN*Z)*B2)/(pA+tA);
438  G4double pR2=std::pow(pA+4.,.305)/fm2MeV2;
439  G4double tR2=std::pow(tA+4.,.305)/fm2MeV2;
440  G4double eB =mB+pR2+tR2;
441  G4double mint=-std::log(1.-G4UniformRand()*(1.-std::exp(-eB*maxt)))/eB;
442#ifdef pdebug
443  G4cout<<"G4QIonIonElastic::PostStDoIt:B1="<<B1<<",B2="<<B2<<",mB="<<mB
444        <<",pR2="<<pR2<<",tR2="<<tR2<<",eB="<<eB<<",mint="<<mint<<G4endl;
445#endif
446#ifdef nandebug
447  if(mint>-.0000001);
448  else  G4cout<<"-Warning-G4QIonIonElastic::PostStDoIt:-t="<<mint<<G4endl;
449#endif
450  G4double cost=1.-(mint+mint)/maxt; // cos(theta) in CMS
451  //
452#ifdef ppdebug
453  G4cout<<"G4QIonIonElastic::PoStDoI:t="<<mint<<",dpcm2="<<CSmanager->GetHMaxT()<<",Ek="
454        <<kinEnergy<<",tM="<<tM<<",pM="<<pM<<",cost="<<cost<<G4endl;
455#endif
456  if(cost>1. || cost<-1. || !(cost>-1. || cost<1.))
457  {
458    if(cost>1.000001 || cost<-1.000001 || !(cost>-1. || cost<1.))
459    {
460      G4double tM2=tM*tM;                         // Squared target mass
461      G4double pEn=pM+kinEnergy;                  // tot projectile Energy in MeV
462      G4double sM=dtM*pEn+tM2+pM2;                // Mondelstam s
463      G4double twop2cm=(tM2+tM2)*(pEn*pEn-pM2)/sM;// Max_t/2 (2*p^2_cm)
464      G4cout<<"-Warning-G4QIonIonElastic::PoStDI:cos="<<cost<<",t="<<mint<<",T="<<kinEnergy
465            <<",tM="<<tM<<",tmax="<<2*kinEnergy*tM<<",p="<<projPDG<<",t="<<targPDG<<G4endl;
466      G4cout<<"G4QIonIonElastic::PSDI:dpcm2="<<twop2cm<<"="<<CSmanager->GetHMaxT()<<G4endl;
467    }
468    if     (cost>1.)  cost=1.;
469    else if(cost<-1.) cost=-1.;
470  }
471  G4LorentzVector reco4M=G4LorentzVector(0.,0.,0.,tM);      // 4mom of the recoil target
472  G4LorentzVector dir4M=tot4M-G4LorentzVector(0.,0.,0.,(tot4M.e()-tM-pM)*.01);
473  if(!G4QHadron(tot4M).RelDecayIn2(scat4M, reco4M, dir4M, cost, cost))
474  {
475    G4cerr<<"G4QIonIonE::PSDI:t4M="<<tot4M<<",pM="<<pM<<",tM="<<tM<<",cost="<<cost<<G4endl;
476  }
477#ifdef debug
478  G4cout<<"G4QIonIonElast::PSDI:s4M="<<scat4M<<"+r4M="<<reco4M<<"="<<scat4M+reco4M<<G4endl;
479  G4cout<<"G4QIonIonElastic::PSDI:scatE="<<scat4M.e()-pM<<",recoE="<<reco4M.e()-tM<<",d4M="
480        <<tot4M-scat4M-reco4M<<G4endl;
481#endif
482  // Update G4VParticleChange for the scattered projectile
483  G4double finE=scat4M.e()-pM;             // Final kinetic energy of the scattered proton
484  if(finE>0.0) aParticleChange.ProposeEnergy(finE);
485  else
486  {
487    if(finE<-1.e-8 || !(finE>-1.||finE<1.)) // NAN or negative
488      G4cerr<<"*Warning*G4QIonIonElastic::PostStDoIt: Zero or negative scattered E="<<finE
489            <<", s4M="<<scat4M<<", r4M="<<reco4M<<", d4M="<<tot4M-scat4M-reco4M<<G4endl;
490    aParticleChange.ProposeEnergy(0.) ;
491    aParticleChange.ProposeTrackStatus(fStopButAlive);
492  }
493  G4ThreeVector findir=scat4M.vect()/scat4M.rho();  // Unit vector in new direction
494  aParticleChange.ProposeMomentumDirection(findir); // new direction for the scattered part
495  EnMomConservation-=scat4M;                        // It must be initialized by (pE+tM,pP)
496  // This is how in general the secondary should be identified
497  G4DynamicParticle* theSec = new G4DynamicParticle; // A secondary for the recoil hadron
498  G4int aA = Z+N;
499#ifdef pdebug
500  G4cout<<"G4QIonIonElastic::PostStepDoIt: Ion Z="<<Z<<", A="<<aA<<G4endl;
501#endif
502  G4ParticleDefinition* theDefinition=G4ParticleTable::GetParticleTable()
503                                                                       ->FindIon(Z,aA,0,Z);
504  if(!theDefinition)G4cout<<"-Warning-G4QIonIonElastic::PoStDI:drop PDG="<<targPDG<<G4endl;
505#ifdef pdebug
506  G4cout<<"G4QIonIonElastic::PoStDI:RecoilName="<<theDefinition->GetParticleName()<<G4endl;
507#endif
508  theSec->SetDefinition(theDefinition);
509
510  EnMomConservation-=reco4M;
511#ifdef tdebug
512  G4cout<<"G4QIonIonElastic::PSD:"<<targPDG<<reco4M<<reco4M.m()<<EnMomConservation<<G4endl;
513#endif
514  theSec->Set4Momentum(reco4M);
515#ifdef debug
516  G4ThreeVector curD=theSec->GetMomentumDirection();
517  G4double curM=theSec->GetMass();
518  G4double curE=theSec->GetKineticEnergy()+curM;
519  G4cout<<"G4QIonIonElastic::PSDI: p="<<curD<<curD.mag()<<",e="<<curE<<",m="<<curM<<G4endl;
520#endif
521  // Make a recoil nucleus
522  G4Track* aNewTrack = new G4Track(theSec, localtime, position );
523  aNewTrack->SetWeight(weight);                                   //    weighted
524  aNewTrack->SetTouchableHandle(trTouchable);
525  aParticleChange.AddSecondary( aNewTrack );
526#ifdef debug
527    G4cout<<"G4QIonIonElastic::PostStepDoIt: **** PostStepDoIt is done ****"<<G4endl;
528#endif
529  return G4VDiscreteProcess::PostStepDoIt(track, step);
530}
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