source: trunk/source/processes/hadronic/models/chiral_inv_phase_space/interface/src/G4QIonIonCrossSection.cc @ 1197

Last change on this file since 1197 was 1055, checked in by garnier, 15 years ago

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26//
27// The lust update: M.V. Kossov, CERN/ITEP(Moscow) 19-Aug-07
28// GEANT4 tag $Name: geant4-09-03-beta-cand-01 $
29//
30//
31// G4 Physics class: G4QIonIonCrossSection for gamma+A cross sections
32// Created: M.V. Kossov, CERN/ITEP(Moscow), 20-Dec-03
33// The last update: M.V. Kossov, CERN/ITEP (Moscow) 15-Feb-04
34// --------------------------------------------------------------------------------
35// ****************************************************************************************
36// ***** This HEADER is a property of the CHIPS hadronic package in Geant4 (M. Kosov) *****
37// *********** DO NOT MAKE ANY CHANGE without approval of Mikhail.Kossov@cern.ch **********
38// ****************************************************************************************
39// Short description: CHIPS cross-sectons for Ion-Ion interactions
40// ---------------------------------------------------------------
41//
42//#define debug
43//#define pdebug
44//#define debug3
45//#define debugn
46//#define debugs
47
48#include "G4QIonIonCrossSection.hh"
49
50// Initialization of the
51G4double* G4QIonIonCrossSection::lastLENI=0;// Pointer to the lastArray of LowEn Inelast CS
52G4double* G4QIonIonCrossSection::lastHENI=0;// Pointer to the lastArray of HighEn InelastCS
53G4double* G4QIonIonCrossSection::lastLENE=0;// Pointer to the lastArray of LowEn Elastic CS
54G4double* G4QIonIonCrossSection::lastHENE=0;// Pointer to the lastArray of HighEn ElasticCS
55G4int     G4QIonIonCrossSection::lastPDG=0; // The last PDG code of the projectile
56G4int     G4QIonIonCrossSection::lastN=0;   // The last N of calculated nucleus
57G4int     G4QIonIonCrossSection::lastZ=0;   // The last Z of calculated nucleus
58G4double  G4QIonIonCrossSection::lastP=0.;  // Last used in cross section Momentum
59G4double  G4QIonIonCrossSection::lastTH=0.; // Last threshold momentum
60G4double  G4QIonIonCrossSection::lastICS=0.;// Last value of the Inelastic Cross Section
61G4double  G4QIonIonCrossSection::lastECS=0.;// Last value of the Elastic Cross Section
62G4int     G4QIonIonCrossSection::lastI=0;   // The last position in the DAMDB
63
64// Returns Pointer to the G4VQCrossSection class
65G4VQCrossSection* G4QIonIonCrossSection::GetPointer()
66{
67  static G4QIonIonCrossSection theCrossSection; //**Static body of Cross Section**
68  return &theCrossSection;
69}
70
71// The main member function giving the collision cross section (P is in IU, CS is in mb)
72// Make pMom in independent units ! (Now it is MeV)
73G4double G4QIonIonCrossSection::GetCrossSection(G4bool fCS, G4double pMom, G4int tZ,
74                                                G4int tN, G4int pPDG)
75{
76  static G4int j;                      // A#0f records found in DB for this projectile
77  static std::vector <G4int>    colPDG;// Vector of the projectile PDG code
78  static std::vector <G4int>    colN;  // Vector of N for calculated nuclei (isotops)
79  static std::vector <G4int>    colZ;  // Vector of Z for calculated nuclei (isotops)
80  static std::vector <G4double> colP;  // Vector of last momenta for the reaction
81  static std::vector <G4double> colTH; // Vector of energy thresholds for the reaction
82  static std::vector <G4double> colICS;// Vector of last inelastic cross-sections
83  static std::vector <G4double> colECS;// Vector of last elastic cross-sections
84  // ***---*** End of the mandatory Static Definitions of the Associative Memory ***---***
85#ifdef pdebug
86  G4cout<<"G4QIICS::GetCS:>>> f="<<fCS<<", Z="<<tZ<<"("<<lastZ<<"), N="<<tN<<"("<<lastN
87        <<"),PDG="<<pPDG<<"("<<lastPDG<<"), p="<<pMom<<"("<<lastTH<<")"<<",Sz="
88        <<colN.size()<<G4endl;
89  //CalculateCrossSection(fCS,-27,j,lastPDG,lastZ,lastN,pMom); // DUMMY TEST
90#endif
91  if(!pPDG)
92  {
93#ifdef pdebug
94    G4cout<<"G4QIonIonCS::GetCS: *** Found pPDG="<<pPDG<<" ====> CS=0"<<G4endl;
95    //CalculateCrossSection(fCS,-27,j,lastPDG,lastZ,lastN,pMom); // DUMMY TEST
96#endif
97    return 0.;                         // projectile PDG=0 is a mistake (?!) @@
98  }
99  G4bool in=false;                     // By default the isotope must be found in the AMDB
100  if(tN!=lastN || tZ!=lastZ || pPDG!=lastPDG)// The nucleus was not the last used isotope
101  {
102    in = false;                        // By default the isotope haven't be found in AMDB 
103    lastP   = 0.;                      // New momentum history (nothing to compare with)
104    lastPDG = pPDG;                    // The last PDG of the projectile
105    lastN   = tN;                      // The last N of the calculated nucleus
106    lastZ   = tZ;                      // The last Z of the calculated nucleus
107    lastI   = colN.size();             // Size of the Associative Memory DB in the heap
108    j  = 0;                            // A#0f records found in DB for this projectile
109    if(lastI) for(G4int i=0; i<lastI; i++) if(colPDG[i]==pPDG) // The partType is found
110    {                                  // The nucleus with projPDG is found in AMDB
111      if(colN[i]==tN && colZ[i]==tZ)
112      {
113        lastI=i;
114        lastTH =colTH[i];                // Last THreshold (A-dependent)
115#ifdef pdebug
116        G4cout<<"G4QIICS::GetCS:*Found* P="<<pMom<<",Threshold="<<lastTH<<",j="<<j<<G4endl;
117        //CalculateCrossSection(fCS,-27,j,lastPDG,lastZ,lastN,pMom); // DUMMY TEST
118#endif
119        if(pMom<=lastTH)
120        {
121#ifdef pdebug
122          G4cout<<"G4QIICS::GetCS:Found P="<<pMom<<"<Threshold="<<lastTH<<"->XS=0"<<G4endl;
123          //CalculateCrossSection(fCS,-27,j,lastPDG,lastZ,lastN,pMom); // DUMMY TEST
124#endif
125          return 0.;                     // Energy is below the Threshold value
126        }
127        lastP  =colP [i];                // Last Momentum  (A-dependent)
128        lastICS=colICS[i];               // Last Inelastic Cross-Section (A-dependent)
129        lastECS=colECS[i];               // Last Elastic Cross-Section (A-dependent)
130        if(std::fabs(lastP/pMom-1.)<tolerance)
131        {
132#ifdef pdebug
133          G4cout<<"G4QIonIonCS::GetCS:P="<<pMom<<",InXS="<<lastICS*millibarn<<",ElXS="
134                <<lastECS*millibarn<<G4endl;
135#endif
136          CalculateCrossSection(fCS,-1,j,lastPDG,lastZ,lastN,pMom); // Update param's only
137          if(fCS) return lastICS*millibarn;     // Use theLastInelasticCS
138          return         lastECS*millibarn;     // Use theLastElasticCS
139        }
140        in = true;                       // This is the case when the isotop is found in DB
141        // Momentum pMom is in IU ! @@ Units
142#ifdef pdebug
143        G4cout<<"G4QIICS::G:UpdatDB P="<<pMom<<",f="<<fCS<<",lI="<<lastI<<",j="<<j<<G4endl;
144#endif
145        lastICS=CalculateCrossSection( true,-1,j,lastPDG,lastZ,lastN,pMom);// read & update
146        lastECS=CalculateCrossSection(false,-1,j,lastPDG,lastZ,lastN,pMom);// read & update
147#ifdef pdebug
148        G4cout<<"G4QIonIonCS::GetCS:=>New(inDB) InCS="<<lastICS<<",ElCS="<<lastECS<<G4endl;
149#endif
150        if((lastICS<=0. || lastECS<=0.) && pMom>lastTH) // Correct the threshold
151        {
152#ifdef pdebug
153          G4cout<<"G4QIonIonCS::GetCS:New,T="<<pMom<<"(CS=0) > Threshold="<<lastTH<<G4endl;
154#endif
155          lastTH=pMom;
156        }
157        break;                           // Go out of the LOOP
158      }
159#ifdef pdebug
160      G4cout<<"--->G4QIonIonCrossSec::GetCrosSec: pPDG="<<pPDG<<",j="<<j<<",N="<<colN[i]
161            <<",Z["<<i<<"]="<<colZ[i]<<",PDG="<<colPDG[i]<<G4endl;
162      //CalculateCrossSection(fCS,-27,j,lastPDG,lastZ,lastN,pMom); // DUMMY TEST
163#endif
164      j++;                             // Increment a#0f records found in DB for this pPDG
165    }
166    if(!in)                            // This nucleus has not been calculated previously
167    {
168#ifdef pdebug
169      G4cout<<"G4QIICS::GetCrosSec:CalcNew P="<<pMom<<",f="<<fCS<<",lastI="<<lastI<<G4endl;
170#endif
171      //!!The slave functions must provide cross-sections in millibarns (mb) !! (not in IU)
172      lastICS=CalculateCrossSection(true ,0,j,lastPDG,lastZ,lastN,pMom); //calculate&create
173      lastECS=CalculateCrossSection(false,0,j,lastPDG,lastZ,lastN,pMom); //calculate&create
174      if(lastICS<=0. || lastECS<=0.)
175      {
176        lastTH = ThresholdEnergy(tZ, tN); // The Threshold Energy which is now the last
177#ifdef pdebug
178        G4cout<<"G4QIonIonCrossSect::GetCrossSect:NewThresh="<<lastTH<<",P="<<pMom<<G4endl;
179#endif
180        if(pMom>lastTH)
181        {
182#ifdef pdebug
183          G4cout<<"G4QIonIonCS::GetCS:1-st,P="<<pMom<<">Thresh="<<lastTH<<"->XS=0"<<G4endl;
184#endif
185          lastTH=pMom;
186        }
187      }
188#ifdef pdebug
189      G4cout<<"G4QIICS::GetCS: *New* ICS="<<lastICS<<", ECS="<<lastICS<<",N="<<lastN<<",Z="
190            <<lastZ<<G4endl;
191#endif
192      colN.push_back(tN);
193      colZ.push_back(tZ);
194      colPDG.push_back(pPDG);
195      colP.push_back(pMom);
196      colTH.push_back(lastTH);
197      colICS.push_back(lastICS);
198      colECS.push_back(lastECS);
199#ifdef pdebug
200      G4cout<<"G4QIICS::GetCS:*1st*, P="<<pMom<<"(MeV), InCS="<<lastICS*millibarn
201            <<", ElCS="<<lastECS*millibarn<<"(mb)"<<G4endl;
202#endif
203      if(fCS) return lastICS*millibarn;     // Use theLastInelasticCS
204      return         lastECS*millibarn;     // Use theLastElasticCS
205    } // End of creation of the new set of parameters
206    else
207    {
208#ifdef pdebug
209      G4cout<<"G4QIICS::GetCS: Update lastI="<<lastI<<",j="<<j<<G4endl;
210#endif
211      colP[lastI]=pMom;
212      colPDG[lastI]=pPDG;
213      colICS[lastI]=lastICS;
214      colECS[lastI]=lastECS;
215    }
216  } // End of parameters udate
217  else if(pMom<=lastTH)
218  {
219#ifdef pdebug
220    G4cout<<"G4QIICS::GetCS: Current T="<<pMom<<" < Threshold="<<lastTH<<", CS=0"<<G4endl;
221    //CalculateCrossSection(fCS,-27,j,lastPDG,lastZ,lastN,pMom); // DUMMY TEST
222#endif
223    return 0.;                         // Momentum is below the Threshold Value -> CS=0
224  }
225  else if(std::fabs(lastP/pMom-1.)<tolerance)
226  {
227#ifdef pdebug
228    G4cout<<"G4QIICS::GetCS:OldCur P="<<pMom<<"="<<pMom<<", InCS="<<lastICS*millibarn
229          <<", ElCS="<<lastECS*millibarn<<"(mb)"<<G4endl;
230#endif
231    if(fCS) return lastICS*millibarn;     // Use theLastInelasticCS
232    return         lastECS*millibarn;     // Use theLastElasticCS
233  }
234  else
235  {
236#ifdef pdebug
237    G4cout<<"G4QIICS::GetCS:UpdatCur P="<<pMom<<",f="<<fCS<<",I="<<lastI<<",j="<<j<<G4endl;
238#endif
239    lastICS=CalculateCrossSection( true,1,j,lastPDG,lastZ,lastN,pMom); // Only UpdateDB
240    lastECS=CalculateCrossSection(false,1,j,lastPDG,lastZ,lastN,pMom); // Only UpdateDB
241    lastP=pMom;
242  }
243#ifdef pdebug
244  G4cout<<"G4QIICS::GetCroSec:*End*,P="<<pMom<<"(MeV), InCS="<<lastICS*millibarn<<", ElCS="
245        <<lastECS*millibarn<<"(mb)"<<G4endl;
246#endif
247    if(fCS) return lastICS*millibarn;     // Use theLastInelasticCS
248    return         lastECS*millibarn;     // Use theLastElasticCS
249}
250
251// The main member function giving the A-A cross section (Momentum in MeV, CS in mb)
252G4double G4QIonIonCrossSection::CalculateCrossSection(G4bool XS,G4int F,G4int I,G4int pPDG,
253                                                      G4int tZ,G4int tN, G4double TotMom)
254{
255  //static const G4double third=1./3.; // power for A^P->R conversion [R=1.1*A^(1/3)]
256  //static const G4double conv=38.; // coeff. R2->sig=c*(pR+tR)^2, c=pi*10(mb/fm^2)*1.21
257  // If change the following, please change in ::GetFunctions:
258  static const G4double THmin=0.;  // @@ start from threshold (?) minimum Energy Threshold
259  static const G4double dP=10.;    // step for the LEN table
260  static const G4int    nL=100;    // A#of LENesonance points in E (each MeV from 2 to 106)
261  static const G4double Pmin=THmin+(nL-1)*dP; // minE for the HighE part
262  static const G4double Pmax=300000.;   // maxE for the HighE part
263  static const G4int    nH=100;         // A#of HResonance points in lnE
264  static const G4double milP=std::log(Pmin); // Low logarithm energy for the HighE part
265  static const G4double malP=std::log(Pmax); // High logarithm energy (each 2.75 percent)
266  static const G4double dlP=(malP-milP)/(nH-1); // Step in log energy in the HighE part
267  //
268  // Associative memory for acceleration
269  static std::vector <G4double*> LENI;   // Vector of pointers: LowEnIneIonIonCrossSection
270  static std::vector <G4double*> HENI;   // Vector of pointers: HighEnIneIonIonCrossSection
271  static std::vector <G4double*> LENE;   // Vector of pointers: LowEnElaIonIonCrossSection
272  static std::vector <G4double*> HENE;   // Vector of pointers: HighEnElaIonIonCrossSection
273#ifdef debug
274  G4cout<<"G4QIonIonCrossSection::CalcCS:N="<<targN<<",Z="<<targZ<<",P="<<Momentum<<G4endl;
275#endif
276  G4int dPDG=pPDG/10;                // 10SZZZAAA
277  G4int zPDG=dPDG/1000;              // 10SZZZ (?)
278  G4int zA=dPDG%1000;                // proj A
279  G4int pZ=zPDG%1000;                // proj Z (?)
280  G4int pN=zA-pZ;                    // proj N (?)
281  G4double Momentum=TotMom/zA;       // Momentum per nucleon
282  if (Momentum<THmin) return 0.;     // @@ This can be dangerouse for the heaviest nuc.!
283  G4double sigma=0.;
284  if(F&&I) sigma=0.;                 // @@ *!* Fake line *!* to use F & I !!!Temporary!!!
285  G4double tA=tN+tZ;                 // Target weight
286  G4double pA=zA;                    // Projectile weight
287  if(F<=0)                           // This isotope was not the last used isotop
288  {
289    if(F<0)                          // This isotope was found in DAMDB =========> RETRIEVE
290    {
291      lastLENI=LENI[I];              // Pointer to Low Energy inelastic cross sections
292      lastHENI=HENI[I];              // Pointer to High Energy inelastic cross sections
293      lastLENE=LENE[I];              // Pointer to Low Energy inelastic cross sections
294      lastHENE=HENE[I];              // Pointer to High Energy inelastic cross sections
295    }
296    else                             // This isotope wasn't calculated previously => CREATE
297    {
298      lastLENI = new G4double[nL];   // Allocate memory for the new LEN cross sections
299      lastHENI = new G4double[nH];   // Allocate memory for the new HEN cross sections
300      lastLENE = new G4double[nL];   // Allocate memory for the new LEN cross sections
301      lastHENE = new G4double[nH];   // Allocate memory for the new HEN cross sections
302      G4int er=GetFunctions(pZ,pN,tZ,tN,lastLENI,lastHENI,lastLENE,lastHENE);
303      if(er<1) G4cerr<<"*W*G4QIonIonCroSec::CalcCrossSection: pA="<<tA<<",tA="<<tA<<G4endl;
304#ifdef debug
305      G4cout<<"G4QIonIonCrossSection::CalcCS: GetFunctions er="<<er<<",pA="<<pA<<",tA="<<tA
306            <<G4endl;
307#endif
308      // *** The synchronization check ***
309      G4int sync=LENI.size();
310      if(sync!=I) G4cerr<<"***G4IonIonCrossSec::CalcCrossSect:Sync="<<sync<<"#"<<I<<G4endl;
311      LENI.push_back(lastLENI);      // added LEN Inelastic
312      HENI.push_back(lastHENI);      // added HEN Inelastic
313      LENE.push_back(lastLENE);      // added LEN Elastic
314      HENE.push_back(lastHENE);      // added HEN Elastic
315    } // End of creation of the new set of parameters
316  } // End of parameters udate
317  // ============================== NOW the Magic Formula =================================
318  if (Momentum<lastTH) return 0.;    // It must be already checked in the interface class
319  else if (Momentum<Pmin)            // LEN region (approximated in E, not in lnE)
320  {
321#ifdef debug
322    G4cout<<"G4QIICS::CalCS:p="<<pA<<",t="<<tA<<",n="<<nL<<",T="<<THmin<<",d="<<dP<<G4endl;
323#endif
324    if(tA<1. || pA<1.)
325    {
326      G4cout<<"-Warning-G4QIICS::CalcCS: pA="<<pA<<" or tA="<<tA<<" aren't nuclei"<<G4endl;
327      sigma=0.;
328    }
329    else
330    {
331      if(XS) sigma=EquLinearFit(Momentum,nL,THmin,dP,lastLENI);
332      else   sigma=EquLinearFit(Momentum,nL,THmin,dP,lastLENE);
333    }
334#ifdef debugn
335    if(sigma<0.) G4cout<<"-Warning-G4QIICS::CalcCS:pA="<<pA<<",tA="<<tA<<",XS="<<XS<<",P="
336                       <<Momentum<<", Th="<<THmin<<", dP="<<dP<<G4endl;
337#endif
338  }
339  else if (Momentum<Pmax)                     // High Energy region
340  {
341    G4double lP=std::log(Momentum);
342#ifdef debug
343    G4cout<<"G4QIonIonCS::CalcCS:before HEN nH="<<nH<<",iE="<<milP<<",dlP="<<dlP<<G4endl;
344#endif
345    if(tA<=1. || pA<=1.)
346    {
347      G4cout<<"-Warning-G4QIICS::CalcCS:pA="<<pA<<"or tA="<<tA<<" aren't composit"<<G4endl;
348      sigma=0.;
349    }
350    else
351    {
352      if(XS) sigma=EquLinearFit(lP,nH,milP,dlP,lastHENI);
353      else   sigma=EquLinearFit(lP,nH,milP,dlP,lastHENE);
354    }
355  }
356  else                                      // UltraHighE region (not frequent)
357  {
358    std::pair<G4double, G4double> inelel = CalculateXS(pZ, pN, tZ, tN, Momentum);
359    if(XS) sigma=inelel.first;
360    else   sigma=inelel.second;
361  }
362#ifdef debug
363  G4cout<<"G4IonIonCrossSection::CalculateCrossSection: sigma="<<sigma<<G4endl;
364#endif
365  if(sigma<0.) return 0.;
366  return sigma;
367}
368
369// Linear fit for YN[N] tabulated (from X0 with fixed step DX) function to X point
370
371// Calculate the functions for the log(A)
372G4int G4QIonIonCrossSection::GetFunctions(G4int pZ,G4int pN,G4int tZ,G4int tN,G4double* li,
373                                          G4double* hi, G4double* le, G4double* he)
374{
375  // If change the following, please change in ::CalculateCrossSection:
376  static const G4double THmin=0.;  // @@ start from threshold (?) minimum Energy Threshold
377  static const G4double dP=10.;    // step for the LEN table
378  static const G4int    nL=100;    // A#of LENesonance points in E (each MeV from 2 to 106)
379  static const G4double Pmin=THmin+(nL-1)*dP;   // minE for the HighE part
380  static const G4double Pmax=100000.;           // maxE for the HighE part
381  static const G4int    nH=100;                 // A#of HResonance points in lnE
382  static const G4double milP=std::log(Pmin);    // Low logarithm energy for the HighE part
383  static const G4double malP=std::log(Pmax);    // High logarithm energy
384  static const G4double dlP=(malP-milP)/(nH-1); // Step in log energy in the HighE part
385  static const G4double lP=std::exp(dlP);       // Multiplication factor in the HighE part
386  // If the cross section approximation formula is changed - replace from file.
387  if(pZ<1 || pN<0 || tZ<1 || pN<0)
388  {
389    G4cout<<"-W-G4QIonIonCS::GetFunct:pZ="<<pZ<<",pN="<<pN<<",tZ="<<tZ<<",tN="<<tN<<G4endl;
390    return -1;
391  }
392  G4double Mom=THmin;
393  for(G4int k=0; k<nL; k++)
394  {
395    std::pair<G4double,G4double> len = CalculateXS(pZ, pN, tZ, tN, Mom);
396    li[k]=len.first;
397    le[k]=len.second;
398    Mom+=dP;
399  }
400  G4double lMom=Pmin;
401  for(G4int j=0; j<nH; j++)
402  {
403    std::pair<G4double,G4double> len = CalculateXS(pZ, pN, pZ, pN, Mom);
404    hi[j]=len.first;
405    he[j]=len.second;
406    lMom*=lP;
407  }
408#ifdef debug
409  G4cout<<"G4QIonIonCS::GetFunctions:p="<<pA<<",t="<<tA<<" pair is calculated"<<G4endl;
410#endif
411  return 1;
412}
413
414// Momentum (Mom=p/A) is in MeV/c, first=InelasticXS, second=ElasticXS (mb)
415std::pair<G4double,G4double> G4QIonIonCrossSection::CalculateXS(G4int pZ,G4int pN,G4int tZ,
416                                                                G4int tN, G4double Mom)
417{
418  static G4VQCrossSection* ElCSman = G4QElasticCrossSection::GetPointer();
419  static G4VQCrossSection* InelPCSman = G4QProtonNuclearCrossSection::GetPointer();
420  static G4VQCrossSection* InelNCSman = G4QNeutronNuclearCrossSection::GetPointer();
421  G4double pA=pZ+pN;
422  G4double tA=tZ+tN;
423  if(pA<.9 || tA<.9 ||pA>239. || tA>239 || Mom < 0.) return std::make_pair(0.,0.);
424  G4double inCS=0.;
425  G4double elCS=0.;
426  if(pA<1.1 || tA<1.1) // Ion-nucleon/nucleon-ion interaction use NA(in,el)
427  {
428    if ( (pZ == 1 && !pN) || (tZ == 1 && !tN) ) // proton-nuclear
429    {
430      elCS=InelPCSman->GetCrossSection(true, Mom, tZ, tN, 2212);
431      inCS=ElCSman->GetCrossSection(true, Mom, tZ, tN, 2212);
432    }
433    else if(pN==1 && !pZ)                // neutron-nuclear
434    {
435      elCS=InelNCSman->GetCrossSection(true, Mom, tZ, tN, 2112);
436      inCS=ElCSman->GetCrossSection(true, Mom, tZ, tN, 2112);
437    }
438    else G4cerr<<"-Warn-G4QIICS::CaCS:pZ="<<pZ<<",pN="<<pN<<",tZ="<<tZ<<",tN="<<tN<<G4endl;
439  }
440  else
441  {
442    G4double P2=Mom*Mom;
443    G4double P4=P2*P2;
444    G4double P8=P4*P4;
445    G4double T=ThresholdMomentum(pZ, pN, tZ, tN); // @@ Can be cashed as lastTH (?)
446    G4double T2=T*T;
447    G4double T4=T2*T2;
448    G4double tot=CalculateTotal(pA, tA, Mom)*P8/(P8+T4*T4); // @@ convert to Indep. Units
449    G4double rat=CalculateElTot(pA, tA, Mom);
450    elCS=tot*rat;
451    inCS=tot-elCS;
452  }
453  return std::make_pair(inCS,elCS);
454}
455
456// Total Ion-ion cross-section (mb), Momentum (Mom) here is p/A (MeV/c=IU)
457G4double G4QIonIonCrossSection::CalculateTotal(G4double pA, G4double tA, G4double Mom)
458{
459  G4double y=std::log(Mom/1000.); // Log of momentum in GeV/c
460  G4double ab=pA+tA;
461  G4double al=std::log(ab);
462  G4double ap=std::log(pA*tA);
463  G4double e=std::pow(pA,0.1)+std::pow(tA,0.1);
464  G4double d=e-1.55/std::pow(al,0.2);
465  G4double f=3.3+130./ab/ab+2.25/e;
466  if(pA<4. || tA<4.) f=4.;
467  G4double c=(385.+11.*ab/(1.+.02*ab*al)+(.5*ab+500./al/al)/al)*std::pow(d,f);
468  G4double r=y-3.-4./ap/ap;
469  return c+d*r*r;
470}
471
472// Ratio elastic/Total, Momentum (Mom) here is p/A (MeV/c=IU)
473G4double G4QIonIonCrossSection::CalculateElTot(G4double pA, G4double tA, G4double Mom)
474{
475  G4double y=std::log(Mom/1000.); // Log of momentum in GeV/c
476  G4double ab=pA*tA;
477  G4double ap=std::log(ab);
478  G4double r=y-3.92-1.73/ap/ap;
479  G4double d=.00166/(1.+.002*std::pow(ab,1.33333));
480  G4double al=std::log(pA+tA);
481  G4double e=1.+.235*(std::fabs(ap-5.78));
482  if     (std::fabs(pA-2.)<.1 && std::fabs(tA-2.)<.1) e=2.18;
483  else if(std::fabs(pA-2.)<.1 && std::fabs(tA-3.)<.1) e=1.90;
484  else if(std::fabs(pA-3.)<.1 && std::fabs(tA-2.)<.1) e=1.90;
485  else if(std::fabs(pA-2.)<.1 && std::fabs(tA-4.)<.1) e=1.65;
486  else if(std::fabs(pA-4.)<.1 && std::fabs(tA-2.)<.1) e=1.65;
487  else if(std::fabs(pA-3.)<.1 && std::fabs(tA-4.)<.1) e=1.32;
488  else if(std::fabs(pA-4.)<.1 && std::fabs(tA-3.)<.1) e=1.32;
489  else if(std::fabs(pA-4.)<.1 && std::fabs(tA-4.)<.1) e=1.;
490  G4double f=.37+.0188*al;
491  G4double g=std::log(std::pow(pA,0.35)+std::pow(tA,0.35));
492  G4double h=g*g;
493  G4double c=f/(1.+e/h/h);
494  return c+d*r*r;
495}
496
497// Electromagnetic momentum/A-threshold (in MeV/c)
498G4double G4QIonIonCrossSection::ThresholdMomentum(G4int pZ, G4int pN, G4int tZ, G4int tN)
499{
500  static const G4double third=1./3.;
501  static const G4double pM = G4QPDGCode(2212).GetMass(); // Proton mass in MeV
502  static const G4double tpM= pM+pM;       // Doubled proton mass (MeV)
503  if(pZ<.99 || pN<0. || tZ<.99 || tN<0.) return 0.;
504  G4double tA=tZ+tN;
505  G4double pA=pZ+pN;
506  //G4double dE=1.263*tZ/(1.+std::pow(tA,third));
507  G4double dE=pZ*tZ/(std::pow(pA,third)+std::pow(tA,third))/pA; // dE/pA
508  return std::sqrt(dE*(tpM+dE));
509}
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