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source: trunk/source/processes/hadronic/models/chiral_inv_phase_space/cross_sections/src/G4QAntiBaryonPlusNuclearCrossSection.cc @ 1337

Last change on this file since 1337 was 1337, checked in by garnier, 14 years ago
tag geant4.9.4 beta 1 + modifs locales
File size: 18.6 KB

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19	// * technical work of the GEANT4 collaboration. *
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25	//
26	//
27	// The lust update: M.V. Kossov, CERN/ITEP(Moscow) 17-June-02
28	// GEANT4 tag $Name: geant4-09-04-beta-01 $
29	//
30	//
31	// G4 Physics class: G4QAntiBaryonPlusNuclearCrossSection 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 part of the CHIPS physics package (author: M. Kosov)
37	// ****************************************************************************************
38	// Short description: CHIPS cross-sections for AntiBaryon(plus)-nuclear interactions
39	// -------------------------------------------------------------------------------------
40	//
41	//#define debug
42	//#define pdebug
43	//#define debug3
44	//#define debugn
45	//#define debugs
46
47	#include "G4QAntiBaryonPlusNuclearCrossSection.hh"
48
49	// Initialization of the
50	G4double* G4QAntiBaryonPlusNuclearCrossSection::lastLEN=0; // PointerToLastArray ofLowEn CS
51	G4double* G4QAntiBaryonPlusNuclearCrossSection::lastHEN=0; // PointerToLastArray ofHighEnCS
52	G4int G4QAntiBaryonPlusNuclearCrossSection::lastN=0; // TheLastN of calculatedNucleus
53	G4int G4QAntiBaryonPlusNuclearCrossSection::lastZ=0; // TheLastZ of calculatedNucleus
54	G4double G4QAntiBaryonPlusNuclearCrossSection::lastP=0.; // LastUsedCrossSectionMomentum
55	G4double G4QAntiBaryonPlusNuclearCrossSection::lastTH=0.; // Last threshold momentum
56	G4double G4QAntiBaryonPlusNuclearCrossSection::lastCS=0.; // LastValue of the CrossSection
57	G4int G4QAntiBaryonPlusNuclearCrossSection::lastI=0; // TheLastPosition in the DAMDB
58	std::vector<G4double> G4QAntiBaryonPlusNuclearCrossSection::LEN =
59	new std::vector<G4double*>;
60	std::vector<G4double> G4QAntiBaryonPlusNuclearCrossSection::HEN =
61	new std::vector<G4double*>;
62
63	// Returns Pointer to the G4VQCrossSection class
64	G4VQCrossSection* G4QAntiBaryonPlusNuclearCrossSection::GetPointer()
65	{
66	static G4QAntiBaryonPlusNuclearCrossSection theCrossSection;//Static body of CrossSection
67	return &theCrossSection;
68	}
69
70	G4QAntiBaryonPlusNuclearCrossSection::~G4QAntiBaryonPlusNuclearCrossSection()
71	{
72	G4int lens=LEN->size();
73	for(G4int i=0; i<lens; ++i) delete[] (*LEN)[i];
74	delete LEN;
75	G4int hens=HEN->size();
76	for(G4int i=0; i<hens; ++i) delete[] (*HEN)[i];
77	delete HEN;
78	}
79
80	// The main member function giving the collision cross section (P is in IU, CS is in mb)
81	// Make pMom in independent units ! (Now it is MeV)
82	G4double G4QAntiBaryonPlusNuclearCrossSection::GetCrossSection(G4bool fCS, G4double pMom,
83	G4int tgZ, G4int tgN, G4int PDG)
84	{
85	static G4double tolerance=0.001; // Tolerance (0.1%) to consider as "the same mom"
86	static G4int j; // A#0f Z/N-records already tested in AMDB
87	static std::vector <G4int> colN; // Vector of N for calculated nuclei (isotops)
88	static std::vector <G4int> colZ; // Vector of Z for calculated nuclei (isotops)
89	static std::vector <G4double> colP; // Vector of last momenta for the reaction
90	static std::vector <G4double> colTH; // Vector of energy thresholds for the reaction
91	static std::vector <G4double> colCS; // Vector of last cross sections for the reaction
92	// *---* End of the mandatory Static Definitions of the Associative Memory *---*
93	#ifdef debug
94	G4cout<<"G4QaBPCS::GetCS:>>>f="<<fCS<<", p="<<pMom<<", Z="<<tgZ<<"("<<lastZ<<") ,N="<<tgN
95	<<"("<<lastN<<"),PDG="<<PDG<<", thresh="<<lastTH<<",Sz="<<colN.size()<<G4endl;
96	#endif
97	if(PDG!=-3112 && PDG!=-3312 && PDG!=-3334)
98	G4cout<<"-Warning-G4QAntiBaryonPlusCS::GetCS: Not a PositiveAntiBar,PDG="<<PDG<<G4endl;
99	G4bool in=false; // By default the isotope must be found in the AMDB
100	if(tgN!=lastN \|\| tgZ!=lastZ) // 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	lastN = tgN; // The last N of the calculated nucleus
105	lastZ = tgZ; // The last Z of the calculated nucleus
106	lastI = colN.size(); // Size of the Associative Memory DB in the heap
107	j = 0; // A#0f records found in DB for this projectile
108	#ifdef debug
109	G4cout<<"G4QABPNuclCS::GetCS: the amount of records in the AMDB lastI="<<lastI<<G4endl;
110	#endif
111	if(lastI) for(G4int i=0; i<lastI; i++) // AMDB exists, try to find the (Z,N) isotope
112	{
113	if(colN[i]==tgN && colZ[i]==tgZ) // Try the record "i" in the AMDB
114	{
115	lastI=i; // Remember the index for future fast/last use
116	lastTH =colTH[i]; // The last THreshold (A-dependent)
117	#ifdef debug
118	G4cout<<"G4QaBPCS::GetCS:FoundP="<<pMom<<",Threshold="<<lastTH<<",j="<<j<<G4endl;
119	#endif
120	if(pMom<=lastTH)
121	{
122	#ifdef debug
123	G4cout<<"G4QPCS::GetCS:Found,P="<<pMom<<" < Threshold="<<lastTH<<",CS=0"<<G4endl;
124	#endif
125	return 0.; // Energy is below the Threshold value
126	}
127	lastP =colP [i]; // Last Momentum (A-dependent)
128	lastCS =colCS[i]; // Last CrossSect (A-dependent)
129	if(std::fabs(lastP-pMom)<tolerance*pMom)
130	//if(lastP==pMom) // VI do not use tolerance
131	{
132	#ifdef debug
133	G4cout<<"G4QaBPNCS::GetCS:.DoNothing.P="<<pMom<<",CS="<<lastCS*millibarn<<G4endl;
134	#endif
135	//CalculateCrossSection(fCS,-1,j,PDG,lastZ,lastN,pMom); // Update param's only
136	return lastCS*millibarn; // Use theLastCS
137	}
138	in = true; // This is the case when the isotop is found in DB
139	// Momentum pMom is in IU ! @@ Units
140	#ifdef debug
141	G4cout<<"G4QaBPNCS::G:UpdDB,P="<<pMom<<",f="<<fCS<<",lI="<<lastI<<",j="<<j<<G4endl;
142	#endif
143	lastCS=CalculateCrossSection(fCS,-1,j,PDG,lastZ,lastN,pMom); // read & update
144	#ifdef debug
145	G4cout<<"G4QaBPNuCS::GetCrosSec: *****> New (inDB) Calculated CS="<<lastCS<<G4endl;
146	#endif
147	if(lastCS<=0. && pMom>lastTH) // Correct the threshold (@@ No intermediate Zeros)
148	{
149	#ifdef debug
150	G4cout<<"G4QaBPNuCS::GetCS: New P="<<pMom<<"(CS=0) > Threshold="<<lastTH<<G4endl;
151	#endif
152	lastCS=0.;
153	lastTH=pMom;
154	}
155	break; // Go out of the LOOP
156	}
157	#ifdef debug
158	G4cout<<"-->G4QaBarPNucCrossSec::GetCrosSec: pPDG="<<PDG<<", j="<<j<<", N="<<colN[i]
159	<<",Z["<<i<<"]="<<colZ[i]<<G4endl;
160	#endif
161	j++; // Increment a#0f records found in DB
162	}
163	#ifdef debug
164	G4cout<<"-?-G4QaBPNCS::GeCS:R,Z="<<tgZ<<",N="<<tgN<<",in="<<in<<",j="<<j<<" ?"<<G4endl;
165	#endif
166	if(!in) // This isotope has not been calculated previously
167	{
168	#ifdef debug
169	G4cout<<"^^^G4QaBPCS::GetCS:CalcNewP="<<pMom<<", f="<<fCS<<", lastI="<<lastI<<G4endl;
170	#endif
171	//!!The slave functions must provide cross-sections in millibarns (mb) !! (not in IU)
172	lastCS=CalculateCrossSection(fCS,0,j,PDG,lastZ,lastN,pMom); //calculate & create
173	//if(lastCS>0.) // It means that the AMBD was initialized
174	//{
175
176	lastTH = ThresholdEnergy(tgZ, tgN); // The Threshold Energy which is now the last
177	#ifdef debug
178	G4cout<<"G4QaBPNucCrossSec::GetCrossSect: NewThresh="<<lastTH<<",P="<<pMom<<G4endl;
179	#endif
180	colN.push_back(tgN);
181	colZ.push_back(tgZ);
182	colP.push_back(pMom);
183	colTH.push_back(lastTH);
184	colCS.push_back(lastCS);
185	#ifdef debug
186	G4cout<<"G4QaBPNCS::GetCrosSec:lCS="<<lastCS<<",lZ="<<lastN<<",lN="<<lastZ<<G4endl;
187	#endif
188	//} // M.K. Presence of H1 with high threshold breaks the syncronization
189	#ifdef pdebug
190	G4cout<<"G4QaBPNCS::GCS:1st,P="<<pMom<<"(MeV),CS="<<lastCS*millibarn<<"(mb)"<<G4endl;
191	#endif
192	return lastCS*millibarn;
193	} // End of creation of the new set of parameters
194	else
195	{
196	#ifdef debug
197	G4cout<<"G4QaBarPNucCrossSect::GetCrosSect: Update lastI="<<lastI<<",j="<<j<<G4endl;
198	#endif
199	colP[lastI]=pMom;
200	colCS[lastI]=lastCS;
201	}
202	} // End of parameters udate
203	else if(pMom<=lastTH)
204	{
205	#ifdef debug
206	G4cout<<"G4QaBPNuCS::GetCS:CurrentP="<<pMom<<" < Threshold="<<lastTH<<", CS=0"<<G4endl;
207	#endif
208	return 0.; // Momentum is below the Threshold Value -> CS=0
209	}
210	else if(std::fabs(lastP-pMom)<tolerance*pMom)
211	//else if(lastP==pMom) // VI do not use tolerance
212	{
213	#ifdef debug
214	G4cout<<"G4QaBPCS::GetCS:OldNZ&P="<<lastP<<"="<<pMom<<",CS="<<lastCS*millibarn<<G4endl;
215	#endif
216	return lastCS*millibarn; // Use theLastCS
217	}
218	else // It is the last used -> use the current tables
219	{
220	#ifdef debug
221	G4cout<<"-!-G4QaBPCS::GeCS:UseCurP="<<pMom<<",f="<<fCS<<",I="<<lastI<<",j="<<j<<G4endl;
222	#endif
223	lastCS=CalculateCrossSection(fCS,1,j,PDG,lastZ,lastN,pMom); // Only read and UpdateDB
224	lastP=pMom;
225	}
226	#ifdef debug
227	G4cout<<"==>G4QaBPCS::GetCroSec:P="<<pMom<<"(MeV),CS="<<lastCS*millibarn<<"(mb)"<<G4endl;
228	#endif
229	return lastCS*millibarn;
230	}
231
232	// The main member function giving the gamma-A cross section (E in GeV, CS in mb)
233	G4double G4QAntiBaryonPlusNuclearCrossSection::CalculateCrossSection(G4bool, G4int F, G4int I,
234	G4int, G4int targZ, G4int targN, G4double Momentum)
235	{
236	static const G4double THmin=27.; // default minimum Momentum (MeV/c) Threshold
237	static const G4double THmiG=THmin*.001; // minimum Momentum (GeV/c) Threshold
238	static const G4double dP=10.; // step for the LEN (Low ENergy) table MeV/c
239	static const G4double dPG=dP*.001; // step for the LEN (Low ENergy) table GeV/c
240	static const G4int nL=105; // A#of LEN points in E (step 10 MeV/c)
241	static const G4double Pmin=THmin+(nL-1)*dP; // minP for the HighE part with safety
242	static const G4double Pmax=227000.; // maxP for the HEN (High ENergy) part 227 GeV
243	static const G4int nH=224; // A#of HEN points in lnE
244	static const G4double milP=std::log(Pmin);// Low logarithm energy for the HEN part
245	static const G4double malP=std::log(Pmax);// High logarithm energy (each 2.75 percent)
246	static const G4double dlP=(malP-milP)/(nH-1); // Step in log energy in the HEN part
247	static const G4double milPG=std::log(.001*Pmin);// Low logarithmEnergy for HEN part GeV/c
248	#ifdef debug
249	G4cout<<"G4QaBPNuCS::CalCS:N="<<targN<<",Z="<<targZ<<",P="<<Momentum<<">"<<THmin<<G4endl;
250	#endif
251	G4double sigma=0.;
252	if(F&&I) sigma=0.; // @@ ! Fake line ! to use F & I !!!Temporary!!!
253	G4double A=targN+targZ; // A of the target
254	#ifdef debug
255	G4cout<<"G4QaBarPNucCS::CalCS:A="<<A<<",F="<<F<<",I="<<I<<",nL="<<nL<<",nH="<<nH<<G4endl;
256	#endif
257	if(F<=0) // This isotope was not the last used isotop
258	{
259	if(F<0) // This isotope was found in DAMDB =======> RETRIEVE
260	{
261	G4int sync=LEN->size();
262	if(sync<=I) G4cerr<<"!G4QaBarPNuclCS::CalcCrosSect: Sync="<<sync<<"<="<<I<<G4endl;
263	lastLEN=(*LEN)[I]; // Pointer to prepared LowEnergy cross sections
264	lastHEN=(*HEN)[I]; // Pointer to prepared High Energy cross sections
265	}
266	else // This isotope wasn't calculated before => CREATE
267	{
268	lastLEN = new G4double[nL]; // Allocate memory for the new LEN cross sections
269	lastHEN = new G4double[nH]; // Allocate memory for the new HEN cross sections
270	// --- Instead of making a separate function ---
271	G4double P=THmiG; // Table threshold in GeV/c
272	for(G4int m=0; m<nL; m++)
273	{
274	lastLEN[m] = CrossSectionLin(targZ, targN, P);
275	P+=dPG;
276	}
277	G4double lP=milPG;
278	for(G4int n=0; n<nH; n++)
279	{
280	lastHEN[n] = CrossSectionLog(targZ, targN, lP);
281	lP+=dlP;
282	}
283	#ifdef debug
284	G4cout<<"-*->G4QaBarPNucCS::CalCS:Tab for Z="<<targZ<<",N="<<targN<<",I="<<I<<G4endl;
285	#endif
286	// --- End of possible separate function
287	// * The synchronization check *
288	G4int sync=LEN->size();
289	if(sync!=I)
290	{
291	G4cerr<<"***G4QaBarPNuclCS::CalcCrossSect: Sinc="<<sync<<"#"<<I<<", Z=" <<targZ
292	<<", N="<<targN<<", F="<<F<<G4endl;
293	//G4Exception("G4PiMinusNuclearCS::CalculateCS:","39",FatalException,"DBoverflow");
294	}
295	LEN->push_back(lastLEN); // remember the Low Energy Table
296	HEN->push_back(lastHEN); // remember the High Energy Table
297	} // End of creation of the new set of parameters
298	} // End of parameters udate
299	// ============================== NOW the Magic Formula =================================
300	#ifdef debug
301	G4cout<<"G4QaBPNCS::CalCS:lTH="<<lastTH<<",Pmi="<<Pmin<<",dP="<<dP<<",dlP="<<dlP<<G4endl;
302	#endif
303	if (Momentum<lastTH) return 0.; // It must be already checked in the interface class
304	else if (Momentum<Pmin) // High Energy region
305	{
306	#ifdef debug
307	G4cout<<"G4QaBPNCS::CalcCS:bLEN A="<<A<<", nL="<<nL<<",TH="<<THmin<<",dP="<<dP<<G4endl;
308	#endif
309	if(A<=1.) sigma=0.;
310	else sigma=EquLinearFit(Momentum,nL,THmin,dP,lastLEN);
311	#ifdef debugn
312	if(sigma<0.)
313	G4cout<<"G4QaBPNCS::CalcCS:A="<<A<<",E="<<Momentum<<",T="<<THmin<<",dP="<<dP<<G4endl;
314	#endif
315	}
316	else if (Momentum<Pmax) // High Energy region
317	{
318	G4double lP=std::log(Momentum);
319	#ifdef debug
320	G4cout<<"G4QaBarPNucCS::CalcCS:before HEN nH="<<nH<<",iE="<<milP<<",dlP="<<dlP<<G4endl;
321	#endif
322	sigma=EquLinearFit(lP,nH,milP,dlP,lastHEN);
323	}
324	else // UHE region (calculation, not frequent)
325	{
326	G4double P=0.001*Momentum; // Approximation formula is for P in GeV/c
327	sigma=CrossSectionFormula(targZ, targN, P, std::log(P));
328	}
329	#ifdef debug
330	G4cout<<"G4QAntiBaryonPlusNuclearCrossSection::CalcCS: CS="<<sigma<<G4endl;
331	#endif
332	if(sigma<0.) return 0.;
333	return sigma;
334	}
335
336	// Electromagnetic momentum-threshold (in MeV/c)
337	G4double G4QAntiBaryonPlusNuclearCrossSection::ThresholdMomentum(G4int tZ, G4int tN)
338	{
339	static const G4double third=1./3.;
340	static const G4double prM = G4QPDGCode(2212).GetMass(); // Proton mass in MeV
341	static const G4double pM = G4QPDGCode(3112).GetMass(); // Projectile mass in MeV
342	static const G4double tpM= pM+pM; // Doubled projectile mass (MeV)
343	G4double tA=tZ+tN;
344	if(tZ<.99 \|\| tN<0.) return 0.;
345	G4double dE=tZ/(1.+std::pow(tA,third)); // Safety for diffused edge of the nucleus (QE)
346	G4double tM=931.5*tA;
347	if(tZ==1 && tN==0) tM=prM; // A threshold on the free proton
348	G4double T=dE+dE*(dE/2+pM)/tM;
349	return std::sqrt(T*(tpM+T));
350	}
351
352	// Calculation formula for piMinus-nuclear inelastic cross-section (mb) (P in GeV/c)
353	G4double G4QAntiBaryonPlusNuclearCrossSection::CrossSectionLin(G4int tZ, G4int tN,
354	G4double P)
355	{
356	G4double lP=std::log(P);
357	return CrossSectionFormula(tZ, tN, P, lP);
358	}
359
360	// Calculation formula for piMinus-nuclear inelastic cross-section (mb) log(P in GeV/c)
361	G4double G4QAntiBaryonPlusNuclearCrossSection::CrossSectionLog(G4int tZ, G4int tN,
362	G4double lP)
363	{
364	G4double P=std::exp(lP);
365	return CrossSectionFormula(tZ, tN, P, lP);
366	}
367	// Calculation formula for piMinus-nuclear inelastic cross-section (mb) log(P in GeV/c)
368	G4double G4QAntiBaryonPlusNuclearCrossSection::CrossSectionFormula(G4int tZ, G4int tN,
369	G4double P, G4double lP)
370	{
371	G4double sigma=0.;
372	if(tZ==1 && !tN) // AntiBar-Prot interaction from G4QuasiElRatios
373	{
374	G4double ld=lP-3.5;
375	G4double ld2=ld*ld;
376	G4double ye=std::exp(lP*1.25);
377	G4double yt=std::exp(lP*0.35);
378	G4double El=80./(ye+1.);
379	G4double To=(80./yt+.3)/yt;
380	sigma=(To-El)+.2443*ld2+31.48;
381	}
382	else if(tZ==1 && tN==1)
383	{
384	G4double p2=P*P;
385	G4double p4=p2*p2;
386	G4double r=lP-3.7;
387	sigma=(0.6rr+67.+90.std::exp(-lP.666))/(1.+4.E-7/p4/p4);
388	}
389	else if(tZ<97 && tN<152) // General solution
390	{
391	G4double d=lP-4.2;
392	G4double sp=std::sqrt(P);
393	G4double p2=P*P;
394	G4double p4=p2*p2;
395	G4double a=tN+tZ; // A of the target
396	G4double sa=std::sqrt(a);
397	G4double a2=a*a;
398	G4double a3=a2*a;
399	G4double a4=a2*a2;
400	G4double a2s=a2*sa;
401	G4double c=(170.+3600./a2s)/(1.+65./a2s)+40.*std::pow(a,0.712)/(1.+12.2/a)/(1.+34./a2);
402	G4double r=(170.+0.01*a3)/(1.+a3/28000.);
403	G4double h=.016(1.+1.5E-8a3*a2s)/a4;
404	sigma=(c+d*d+r/sp)/(1.+h/p4/p4);
405	#ifdef pdebug
406	G4cout<<"G4QAntiBarPlNucCS::CSForm: A="<<a<<",P="<<P<<",CS="<<sigma<<",c="<<c<<",g="<<g
407	<<",d="<<d<<",r="<<r<<",e="<<e<<",h="<<h<<G4endl;
408	#endif
409	}
410	else
411	{
412	G4cerr<<"-Warning-G4QAntiBarPlNuclCroSect::CSForm:Bad A Z="<<tZ<<", N="<<tN<<G4endl;
413	sigma=0.;
414	}
415	if(sigma<0.) return 0.;
416	return sigma;
417	}

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