source: trunk/source/processes/hadronic/models/chiral_inv_phase_space/cross_sections/src/G4QIonIonCrossSection.cc @ 1316

Last change on this file since 1316 was 1315, checked in by garnier, 14 years ago

update geant4-09-04-beta-cand-01 interfaces-V09-03-09 vis-V09-03-08
File size: 23.9 KB
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26//
27// The lust update: M.V. Kossov, CERN/ITEP(Moscow) 19-Aug-07
28// GEANT4 tag $Name: geant4-09-04-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): fCS=true->Inelastic, fCS=false->Elastic
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#endif
90  if(!pPDG)
91  {
92#ifdef pdebug
93    G4cout<<"G4QIonIonCS::GetCS: *** Found pPDG="<<pPDG<<" ====> CS=0"<<G4endl;
94#endif
95    return 0.;                         // projectile PDG=0 is a mistake (?!) @@
96  }
97  G4bool in=false;                     // By default the isotope must be found in the AMDB
98  if(tN!=lastN || tZ!=lastZ || pPDG!=lastPDG)// The nucleus was not the last used isotope
99  {
100    in = false;                        // By default the isotope haven't be found in AMDB 
101    lastP   = 0.;                      // New momentum history (nothing to compare with)
102    lastPDG = pPDG;                    // The last PDG of the projectile
103    lastN   = tN;                      // The last N of the calculated nucleus
104    lastZ   = tZ;                      // The last Z of the calculated nucleus
105    lastI   = colN.size();             // Size of the Associative Memory DB in the heap
106    j  = 0;                            // A#0f records found in DB for this projectile
107#ifdef pdebug
108    G4cout<<"G4QIICS::GetCS:FindI="<<lastI<<",pPDG="<<pPDG<<",tN="<<tN<<",tZ="<<tZ<<G4endl;
109#endif
110    if(lastI) for(G4int i=0; i<lastI; i++) // Loop over all DB
111    {                                  // The nucleus with projPDG is found in AMDB
112#ifdef pdebug
113      G4cout<<"G4QII::GCS:P="<<colPDG[i]<<",N="<<colN[i]<<",Z="<<colZ[i]<<",j="<<j<<G4endl;
114#endif
115      if(colPDG[i]==pPDG && colN[i]==tN && colZ[i]==tZ)
116      {
117        lastI=i;
118        lastTH =colTH[i];                // Last THreshold (A-dependent)
119#ifdef pdebug
120        G4cout<<"G4QIICS::GetCS:*Found* P="<<pMom<<",Threshold="<<lastTH<<",j="<<j<<G4endl;
121#endif
122        if(pMom<=lastTH)
123        {
124#ifdef pdebug
125          G4cout<<"G4QIICS::GetCS:Found P="<<pMom<<"<Threshold="<<lastTH<<"->XS=0"<<G4endl;
126#endif
127          return 0.;                     // Energy is below the Threshold value
128        }
129        lastP  =colP [i];                // Last Momentum  (A-dependent)
130        lastICS=colICS[i];               // Last Inelastic Cross-Section (A-dependent)
131        lastECS=colECS[i];               // Last Elastic Cross-Section (A-dependent)
132        if(std::fabs(lastP/pMom-1.)<tolerance)
133        {
134#ifdef pdebug
135          G4cout<<"G4QIonIonCS::GetCS:P="<<pMom<<",InXS="<<lastICS*millibarn<<",ElXS="
136                <<lastECS*millibarn<<G4endl;
137#endif
138          CalculateCrossSection(fCS,-1,j,lastPDG,lastZ,lastN,pMom); // Update param's only
139          if(fCS) return lastICS*millibarn;     // Use theLastInelasticCS
140          return         lastECS*millibarn;     // Use theLastElasticCS
141        }
142        in = true;                       // This is the case when the isotop is found in DB
143        // Momentum pMom is in IU ! @@ Units
144#ifdef pdebug
145        G4cout<<"G4QIICS::G:UpdatDB P="<<pMom<<",f="<<fCS<<",lI="<<lastI<<",j="<<j<<G4endl;
146#endif
147        lastICS=CalculateCrossSection( true,-1,j,lastPDG,lastZ,lastN,pMom);// read & update
148        lastECS=CalculateCrossSection(false,-1,j,lastPDG,lastZ,lastN,pMom);// read & update
149#ifdef pdebug
150        G4cout<<"G4QIonIonCS::GetCS:=>New(inDB) InCS="<<lastICS<<",ElCS="<<lastECS<<G4endl;
151#endif
152        if((lastICS<=0. || lastECS<=0.) && pMom>lastTH) // Correct the threshold
153        {
154#ifdef pdebug
155          G4cout<<"G4QIonIonCS::GetCS:New,T="<<pMom<<"(CS=0) > Threshold="<<lastTH<<G4endl;
156#endif
157          lastTH=pMom;
158        }
159        break;                           // Go out of the LOOP
160      }
161#ifdef pdebug
162      G4cout<<"--->G4QIonIonCrossSec::GetCrosSec: pPDG="<<pPDG<<",j="<<j<<",N="<<colN[i]
163            <<",Z["<<i<<"]="<<colZ[i]<<",PDG="<<colPDG[i]<<G4endl;
164#endif
165      j++;                             // Increment a#0f records found in DB for this pPDG
166    }
167    if(!in)                            // This nucleus has not been calculated previously
168    {
169#ifdef pdebug
170      G4cout<<"G4QIICS::GetCrosSec:CalcNew P="<<pMom<<",f="<<fCS<<",lastI="<<lastI<<G4endl;
171#endif
172      //!!The slave functions must provide cross-sections in millibarns (mb) !! (not in IU)
173      lastICS=CalculateCrossSection(true ,0,j,lastPDG,lastZ,lastN,pMom); //calculate&create
174      lastECS=CalculateCrossSection(false,0,j,lastPDG,lastZ,lastN,pMom); //calculate&create
175      if(lastICS<=0. || lastECS<=0.)
176      {
177        lastTH = ThresholdEnergy(tZ, tN); // Threshold Energy=Mom=0 which is now the last
178#ifdef pdebug
179        G4cout<<"G4QIonIonCrossSect::GetCrossSect:NewThresh="<<lastTH<<",P="<<pMom<<G4endl;
180#endif
181        if(pMom>lastTH)
182        {
183#ifdef pdebug
184          G4cout<<"G4QIonIonCS::GetCS:1-st,P="<<pMom<<">Thresh="<<lastTH<<"->XS=0"<<G4endl;
185#endif
186          lastTH=pMom;
187        }
188      }
189#ifdef pdebug
190      G4cout<<"G4QIICS::GetCS: *New* ICS="<<lastICS<<", ECS="<<lastECS<<",N="<<lastN<<",Z="
191            <<lastZ<<G4endl;
192#endif
193      colN.push_back(tN);
194      colZ.push_back(tZ);
195      colPDG.push_back(pPDG);
196      colP.push_back(pMom);
197      colTH.push_back(lastTH);
198      colICS.push_back(lastICS);
199      colECS.push_back(lastECS);
200#ifdef pdebug
201      G4cout<<"G4QIICS::GetCS:*1st*, P="<<pMom<<"(MeV), InCS="<<lastICS*millibarn
202            <<", ElCS="<<lastECS*millibarn<<"(mb)"<<G4endl;
203#endif
204      if(fCS) return lastICS*millibarn;     // Use theLastInelasticCS
205      return         lastECS*millibarn;     // Use theLastElasticCS
206    } // End of creation of the new set of parameters
207    else
208    {
209#ifdef pdebug
210      G4cout<<"G4QIICS::GetCS: Update lastI="<<lastI<<",j="<<j<<G4endl;
211#endif
212      colP[lastI]=pMom;
213      colPDG[lastI]=pPDG;
214      colICS[lastI]=lastICS;
215      colECS[lastI]=lastECS;
216    }
217  } // End of parameters udate
218  else if(pMom<=lastTH)
219  {
220#ifdef pdebug
221    G4cout<<"G4QIICS::GetCS: Current T="<<pMom<<" < Threshold="<<lastTH<<", CS=0"<<G4endl;
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: Z="<<tZ<<", N="<<tN<<", P="<<TotMom<<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 || !XS)                   // This isotope was found in DAMDB or Elast =>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) G4cout<<"*W*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      G4double dPp=dP*pA;
332      if(XS) sigma=EquLinearFit(Momentum,nL,THmin,dPp,lastLENI);
333      else   sigma=EquLinearFit(Momentum,nL,THmin,dPp,lastLENE);
334    }
335#ifdef debugn
336    if(sigma<0.) G4cout<<"-Warning-G4QIICS::CalcCS:pA="<<pA<<",tA="<<tA<<",XS="<<XS<<",P="
337                       <<Momentum<<", Th="<<THmin<<", dP="<<dP<<G4endl;
338#endif
339  }
340  else if (Momentum<Pmax*pA)                     // High Energy region
341  {
342    G4double lP=std::log(Momentum);
343#ifdef debug
344    G4cout<<"G4QIonIonCS::CalcCS:before HEN nH="<<nH<<",iE="<<milP<<",dlP="<<dlP<<G4endl;
345#endif
346    if(tA<1. || pA<1.)
347    {
348      G4cout<<"-Warning-G4QIICS::CalCS:pA="<<pA<<" or tA="<<tA<<" aren't composit"<<G4endl;
349      sigma=0.;
350    }
351    else
352    {
353      G4double milPp=milP+std::log(pA);
354      if(XS) sigma=EquLinearFit(lP,nH,milPp,dlP,lastHENI);
355      else   sigma=EquLinearFit(lP,nH,milPp,dlP,lastHENE);
356    }
357  }
358  else                                      // UltraHighE region (not frequent)
359  {
360    std::pair<G4double, G4double> inelel = CalculateXS(pZ, pN, tZ, tN, Momentum);
361    if(XS) sigma=inelel.first;
362    else   sigma=inelel.second;
363  }
364#ifdef debug
365  G4cout<<"G4IonIonCrossSection::CalculateCrossSection: sigma="<<sigma<<G4endl;
366#endif
367  if(sigma<0.) return 0.;
368  return sigma;
369}
370
371// Linear fit for YN[N] tabulated (from X0 with fixed step DX) function to X point
372
373// Calculate the functions for the log(A)
374G4int G4QIonIonCrossSection::GetFunctions(G4int pZ,G4int pN,G4int tZ,G4int tN,G4double* li,
375                                          G4double* hi, G4double* le, G4double* he)
376{
377  // If change the following, please change in ::CalculateCrossSection:
378  static const G4double THmin=0.;  // @@ start from threshold (?) minimum Energy Threshold
379  static const G4double dP=10.;    // step for the LEN table
380  static const G4int    nL=100;    // A#of LENesonance points in E (each MeV from 2 to 106)
381  static const G4double Pmin=THmin+(nL-1)*dP;   // minE for the HighE part
382  static const G4double Pmax=300000.;           // maxE for the HighE part
383  static const G4int    nH=100;                 // A#of HResonance points in lnE
384  static const G4double milP=std::log(Pmin);    // Low logarithm energy for the HighE part
385  static const G4double malP=std::log(Pmax);    // High logarithm energy
386  static const G4double dlP=(malP-milP)/(nH-1); // Step in log energy in the HighE part
387  static const G4double lP=std::exp(dlP);       // Multiplication factor in the HighE part
388  // If the cross section approximation formula is changed - replace from file.
389  if(pZ<1 || pN<0 || tZ<1 || tN<0)
390  {
391    G4cout<<"-W-G4QIonIonCS::GetFunct:pZ="<<pZ<<",pN="<<pN<<",tZ="<<tZ<<",tN="<<tN<<G4endl;
392    return -1;
393  }
394  G4int pA=pN+pZ;
395  G4double dPp=dP*pA;
396  G4double Mom=THmin;
397  for(G4int k=0; k<nL; k++)
398  {
399    std::pair<G4double,G4double> len = CalculateXS(pZ, pN, tZ, tN, Mom);
400    li[k]=len.first;
401    le[k]=len.second;
402    Mom+=dPp;
403  }
404  G4double lMom=Pmin*pA;
405  for(G4int j=0; j<nH; j++)
406  {
407    std::pair<G4double,G4double> len = CalculateXS(pZ, pN, pZ, pN, lMom);
408    hi[j]=len.first;
409    he[j]=len.second;
410    lMom*=lP;
411  }
412#ifdef debug
413  G4cout<<"G4QIonIonCS::GetFunctions: pZ="<<pZ<<", tZ="<<tZ<<" pair is calculated"<<G4endl;
414#endif
415  return 1;
416}
417
418// Momentum (Mom=p/A) is in MeV/c, first=InelasticXS, second=ElasticXS (mb)
419std::pair<G4double,G4double> G4QIonIonCrossSection::CalculateXS(G4int pZ,G4int pN,G4int tZ,
420                                                                G4int tN, G4double Mom)
421{
422  static G4VQCrossSection* PElCSman = G4QProtonElasticCrossSection::GetPointer();
423  static G4VQCrossSection* NElCSman = G4QNeutronElasticCrossSection::GetPointer();
424  static G4VQCrossSection* InelPCSman = G4QProtonNuclearCrossSection::GetPointer();
425  static G4VQCrossSection* InelNCSman = G4QNeutronNuclearCrossSection::GetPointer();
426  G4double pA=pZ+pN;
427  G4double tA=tZ+tN;
428  if(pA<.9 || tA<.9 ||pA>239. || tA>239 || Mom < 0.) return std::make_pair(0.,0.);
429  G4double inCS=0.;
430  G4double elCS=0.;
431  if(pA<1.1 )               // nucleon-ion interaction use NA(in,el)
432  {
433    if     (pZ == 1 && !pN) // proton-nuclear
434    {
435      inCS=InelPCSman->GetCrossSection(true, Mom, tZ, tN, 2212);
436      elCS=PElCSman->GetCrossSection(true, Mom, tZ, tN, 2212);
437    }
438    else if(pN == 1 && !pZ) // neutron-nuclear
439    {
440      inCS=InelNCSman->GetCrossSection(true, Mom, tZ, tN, 2112);
441      elCS=NElCSman->GetCrossSection(true, Mom, tZ, tN, 2112);
442    }
443    else G4cerr<<"-Warn-G4QIICS::CaCS:pZ="<<pZ<<",pN="<<pN<<",tZ="<<tZ<<",tN="<<tN<<G4endl;
444  }
445  else
446  {
447    G4double T=ThresholdMomentum(pZ, pN, tZ, tN); // @@ Can be cashed as lastTH (?)
448    if(Mom<=T)
449    {
450      elCS=0.;
451      inCS=0.;
452    }
453    else
454    {
455      G4double P2=Mom*Mom;
456      G4double T2=T*T;
457      G4double R=1.-T2/P2;                        // @@ Very rough threshold effect
458      //G4double P4=P2*P2;
459      //G4double P8=P4*P4;
460      //G4double T4=T2*T2;
461      //G4double tot=CalculateTotal(pA, tA, Mom)*P8/(P8+T4*T4); // @@ convert to IndepUnits
462      G4double tot=R*CalculateTotal(pA, tA, Mom); // @@ convert to IndepUnits
463      G4double rat=CalculateElTot(pA, tA, Mom);
464      elCS=tot*rat;
465      inCS=tot-elCS;
466    }
467  }
468  return std::make_pair(inCS,elCS);
469}
470
471// Total Ion-ion cross-section (mb), Momentum (Mom) here is p/A (MeV/c=IU) (No Threshold)
472G4double G4QIonIonCrossSection::CalculateTotal(G4double pA, G4double tA, G4double Mom)
473{
474  G4double y=std::log(Mom/1000.); // Log of momentum in GeV/c
475  G4double ab=pA+tA;
476  G4double al=std::log(ab);
477  G4double ap=std::log(pA*tA);
478  G4double e=std::pow(pA,0.1)+std::pow(tA,0.1);
479  G4double d=e-1.55/std::pow(al,0.2);
480  G4double f=4.;
481  if(pA>4. && tA>4.) f=3.3+130./ab/ab+2.25/e;
482  G4double c=(385.+11.*ab/(1.+.02*ab*al)+(.5*ab+500./al/al)/al)*std::pow(d,f);
483  G4double r=y-3.-4./ap/ap;
484#ifdef pdebug
485  G4cout<<"G4QIonIonCS::CalcTot:P="<<Mom<<", stot="<<c+d*r*r<<", d="<<d<<", r="<<r<<G4endl;
486#endif
487  return c+d*r*r;
488}
489
490// Ratio elastic/Total, Momentum (Mom) here is p/A (MeV/c=IU)
491G4double G4QIonIonCrossSection::CalculateElTot(G4double pA, G4double tA, G4double Mom)
492{
493  G4double y=std::log(Mom/1000.); // Log of momentum in GeV/c
494  G4double ab=pA*tA;
495  G4double ap=std::log(ab);
496  G4double r=y-3.92-1.73/ap/ap;
497  G4double d=.00166/(1.+.002*std::pow(ab,1.33333));
498  G4double al=std::log(pA+tA);
499  G4double e=1.+.235*(std::fabs(ap-5.78));
500  if     (std::fabs(pA-2.)<.1 && std::fabs(tA-2.)<.1) e=2.18;
501  else if(std::fabs(pA-2.)<.1 && std::fabs(tA-3.)<.1) e=1.90;
502  else if(std::fabs(pA-3.)<.1 && std::fabs(tA-2.)<.1) e=1.90;
503  else if(std::fabs(pA-2.)<.1 && std::fabs(tA-4.)<.1) e=1.65;
504  else if(std::fabs(pA-4.)<.1 && std::fabs(tA-2.)<.1) e=1.65;
505  else if(std::fabs(pA-3.)<.1 && std::fabs(tA-4.)<.1) e=1.32;
506  else if(std::fabs(pA-4.)<.1 && std::fabs(tA-3.)<.1) e=1.32;
507  else if(std::fabs(pA-4.)<.1 && std::fabs(tA-4.)<.1) e=1.;
508  G4double f=.37+.0188*al;
509  G4double g=std::log(std::pow(pA,0.35)+std::pow(tA,0.35));
510  G4double h=g*g;
511  G4double c=f/(1.+e/h/h);
512#ifdef pdebug
513  G4cout<<"G4QIonIonCS::CalcElT:P="<<Mom<<",el/tot="<<c+d*r*r<<",d="<<d<<", r="<<r<<G4endl;
514#endif
515  return c+d*r*r;
516}
517
518// Electromagnetic momentum/A-threshold (in MeV/c)
519G4double G4QIonIonCrossSection::ThresholdMomentum(G4int pZ, G4int pN, G4int tZ, G4int tN)
520{
521  static const G4double third=1./3.;
522  static const G4double pM = G4QPDGCode(2212).GetMass(); // Proton mass in MeV
523  static const G4double tpM= pM+pM;       // Doubled proton mass (MeV)
524  if(pZ<.99 || pN<0. || tZ<.99 || tN<0.) return 0.;
525  G4double tA=tZ+tN;
526  G4double pA=pZ+pN;
527  //G4double dE=1.263*tZ/(1.+std::pow(tA,third));
528  G4double dE=pZ*tZ/(std::pow(pA,third)+std::pow(tA,third))/pA; // dE/pA (per projNucleon)
529  return std::sqrt(dE*(tpM+dE));
530}
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