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source: trunk/source/processes/hadronic/models/chiral_inv_phase_space/cross_sections/src/G4QAntiBaryonPlusNuclearCrossSection.cc @ 1315

Last change on this file since 1315 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: 18.7 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-cand-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 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-sections for AntiBaryon(plus)-nuclear interactions
40	// -------------------------------------------------------------------------------------
41	//
42	//#define debug
43	//#define pdebug
44	//#define debug3
45	//#define debugn
46	//#define debugs
47
48	#include "G4QAntiBaryonPlusNuclearCrossSection.hh"
49
50	// Initialization of the
51	G4double* G4QAntiBaryonPlusNuclearCrossSection::lastLEN=0; // PointerToLastArray ofLowEn CS
52	G4double* G4QAntiBaryonPlusNuclearCrossSection::lastHEN=0; // PointerToLastArray ofHighEnCS
53	G4int G4QAntiBaryonPlusNuclearCrossSection::lastN=0; // TheLastN of calculatedNucleus
54	G4int G4QAntiBaryonPlusNuclearCrossSection::lastZ=0; // TheLastZ of calculatedNucleus
55	G4double G4QAntiBaryonPlusNuclearCrossSection::lastP=0.; // LastUsedCrossSectionMomentum
56	G4double G4QAntiBaryonPlusNuclearCrossSection::lastTH=0.; // Last threshold momentum
57	G4double G4QAntiBaryonPlusNuclearCrossSection::lastCS=0.; // LastValue of the CrossSection
58	G4int G4QAntiBaryonPlusNuclearCrossSection::lastI=0; // TheLastPosition in the DAMDB
59	std::vector<G4double> G4QAntiBaryonPlusNuclearCrossSection::LEN =
60	new std::vector<G4double*>;
61	std::vector<G4double> G4QAntiBaryonPlusNuclearCrossSection::HEN =
62	new std::vector<G4double*>;
63
64	// Returns Pointer to the G4VQCrossSection class
65	G4VQCrossSection* G4QAntiBaryonPlusNuclearCrossSection::GetPointer()
66	{
67	static G4QAntiBaryonPlusNuclearCrossSection theCrossSection;//Static body of CrossSection
68	return &theCrossSection;
69	}
70
71	G4QAntiBaryonPlusNuclearCrossSection::~G4QAntiBaryonPlusNuclearCrossSection()
72	{
73	G4int lens=LEN->size();
74	for(G4int i=0; i<lens; ++i) delete[] (*LEN)[i];
75	delete LEN;
76	G4int hens=HEN->size();
77	for(G4int i=0; i<hens; ++i) delete[] (*HEN)[i];
78	delete HEN;
79	}
80
81	// The main member function giving the collision cross section (P is in IU, CS is in mb)
82	// Make pMom in independent units ! (Now it is MeV)
83	G4double G4QAntiBaryonPlusNuclearCrossSection::GetCrossSection(G4bool fCS, G4double pMom,
84	G4int tgZ, G4int tgN, G4int PDG)
85	{
86	static G4double tolerance=0.001; // Tolerance (0.1%) to consider as "the same mom"
87	static G4int j; // A#0f Z/N-records already tested in AMDB
88	static std::vector <G4int> colN; // Vector of N for calculated nuclei (isotops)
89	static std::vector <G4int> colZ; // Vector of Z for calculated nuclei (isotops)
90	static std::vector <G4double> colP; // Vector of last momenta for the reaction
91	static std::vector <G4double> colTH; // Vector of energy thresholds for the reaction
92	static std::vector <G4double> colCS; // Vector of last cross sections for the reaction
93	// *---* End of the mandatory Static Definitions of the Associative Memory *---*
94	#ifdef debug
95	G4cout<<"G4QaBPCS::GetCS:>>>f="<<fCS<<", p="<<pMom<<", Z="<<tgZ<<"("<<lastZ<<") ,N="<<tgN
96	<<"("<<lastN<<"),PDG="<<PDG<<", thresh="<<lastTH<<",Sz="<<colN.size()<<G4endl;
97	#endif
98	if(PDG!=-3112 && PDG!=-3312 && PDG!=-3334)
99	G4cout<<"-Warning-G4QAntiBaryonPlusCS::GetCS: Not a PositiveAntiBar,PDG="<<PDG<<G4endl;
100	G4bool in=false; // By default the isotope must be found in the AMDB
101	if(tgN!=lastN \|\| tgZ!=lastZ) // The nucleus was not the last used isotope
102	{
103	in = false; // By default the isotope haven't be found in AMDB
104	lastP = 0.; // New momentum history (nothing to compare with)
105	lastN = tgN; // The last N of the calculated nucleus
106	lastZ = tgZ; // 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	#ifdef debug
110	G4cout<<"G4QABPNuclCS::GetCS: the amount of records in the AMDB lastI="<<lastI<<G4endl;
111	#endif
112	if(lastI) for(G4int i=0; i<lastI; i++) // AMDB exists, try to find the (Z,N) isotope
113	{
114	if(colN[i]==tgN && colZ[i]==tgZ) // Try the record "i" in the AMDB
115	{
116	lastI=i; // Remember the index for future fast/last use
117	lastTH =colTH[i]; // The last THreshold (A-dependent)
118	#ifdef debug
119	G4cout<<"G4QaBPCS::GetCS:FoundP="<<pMom<<",Threshold="<<lastTH<<",j="<<j<<G4endl;
120	#endif
121	if(pMom<=lastTH)
122	{
123	#ifdef debug
124	G4cout<<"G4QPCS::GetCS:Found,P="<<pMom<<" < Threshold="<<lastTH<<",CS=0"<<G4endl;
125	#endif
126	return 0.; // Energy is below the Threshold value
127	}
128	lastP =colP [i]; // Last Momentum (A-dependent)
129	lastCS =colCS[i]; // Last CrossSect (A-dependent)
130	if(std::fabs(lastP-pMom)<tolerance*pMom)
131	//if(lastP==pMom) // VI do not use tolerance
132	{
133	#ifdef debug
134	G4cout<<"G4QaBPNCS::GetCS:.DoNothing.P="<<pMom<<",CS="<<lastCS*millibarn<<G4endl;
135	#endif
136	//CalculateCrossSection(fCS,-1,j,PDG,lastZ,lastN,pMom); // Update param's only
137	return lastCS*millibarn; // Use theLastCS
138	}
139	in = true; // This is the case when the isotop is found in DB
140	// Momentum pMom is in IU ! @@ Units
141	#ifdef debug
142	G4cout<<"G4QaBPNCS::G:UpdDB,P="<<pMom<<",f="<<fCS<<",lI="<<lastI<<",j="<<j<<G4endl;
143	#endif
144	lastCS=CalculateCrossSection(fCS,-1,j,PDG,lastZ,lastN,pMom); // read & update
145	#ifdef debug
146	G4cout<<"G4QaBPNuCS::GetCrosSec: *****> New (inDB) Calculated CS="<<lastCS<<G4endl;
147	#endif
148	if(lastCS<=0. && pMom>lastTH) // Correct the threshold (@@ No intermediate Zeros)
149	{
150	#ifdef debug
151	G4cout<<"G4QaBPNuCS::GetCS: New P="<<pMom<<"(CS=0) > Threshold="<<lastTH<<G4endl;
152	#endif
153	lastCS=0.;
154	lastTH=pMom;
155	}
156	break; // Go out of the LOOP
157	}
158	#ifdef debug
159	G4cout<<"-->G4QaBarPNucCrossSec::GetCrosSec: pPDG="<<PDG<<", j="<<j<<", N="<<colN[i]
160	<<",Z["<<i<<"]="<<colZ[i]<<G4endl;
161	#endif
162	j++; // Increment a#0f records found in DB
163	}
164	#ifdef debug
165	G4cout<<"-?-G4QaBPNCS::GeCS:R,Z="<<tgZ<<",N="<<tgN<<",in="<<in<<",j="<<j<<" ?"<<G4endl;
166	#endif
167	if(!in) // This isotope has not been calculated previously
168	{
169	#ifdef debug
170	G4cout<<"^^^G4QaBPCS::GetCS:CalcNewP="<<pMom<<", f="<<fCS<<", lastI="<<lastI<<G4endl;
171	#endif
172	//!!The slave functions must provide cross-sections in millibarns (mb) !! (not in IU)
173	lastCS=CalculateCrossSection(fCS,0,j,PDG,lastZ,lastN,pMom); //calculate & create
174	//if(lastCS>0.) // It means that the AMBD was initialized
175	//{
176
177	lastTH = ThresholdEnergy(tgZ, tgN); // The Threshold Energy which is now the last
178	#ifdef debug
179	G4cout<<"G4QaBPNucCrossSec::GetCrossSect: NewThresh="<<lastTH<<",P="<<pMom<<G4endl;
180	#endif
181	colN.push_back(tgN);
182	colZ.push_back(tgZ);
183	colP.push_back(pMom);
184	colTH.push_back(lastTH);
185	colCS.push_back(lastCS);
186	#ifdef debug
187	G4cout<<"G4QaBPNCS::GetCrosSec:lCS="<<lastCS<<",lZ="<<lastN<<",lN="<<lastZ<<G4endl;
188	#endif
189	//} // M.K. Presence of H1 with high threshold breaks the syncronization
190	#ifdef pdebug
191	G4cout<<"G4QaBPNCS::GCS:1st,P="<<pMom<<"(MeV),CS="<<lastCS*millibarn<<"(mb)"<<G4endl;
192	#endif
193	return lastCS*millibarn;
194	} // End of creation of the new set of parameters
195	else
196	{
197	#ifdef debug
198	G4cout<<"G4QaBarPNucCrossSect::GetCrosSect: Update lastI="<<lastI<<",j="<<j<<G4endl;
199	#endif
200	colP[lastI]=pMom;
201	colCS[lastI]=lastCS;
202	}
203	} // End of parameters udate
204	else if(pMom<=lastTH)
205	{
206	#ifdef debug
207	G4cout<<"G4QaBPNuCS::GetCS:CurrentP="<<pMom<<" < Threshold="<<lastTH<<", CS=0"<<G4endl;
208	#endif
209	return 0.; // Momentum is below the Threshold Value -> CS=0
210	}
211	else if(std::fabs(lastP-pMom)<tolerance*pMom)
212	//else if(lastP==pMom) // VI do not use tolerance
213	{
214	#ifdef debug
215	G4cout<<"G4QaBPCS::GetCS:OldNZ&P="<<lastP<<"="<<pMom<<",CS="<<lastCS*millibarn<<G4endl;
216	#endif
217	return lastCS*millibarn; // Use theLastCS
218	}
219	else // It is the last used -> use the current tables
220	{
221	#ifdef debug
222	G4cout<<"-!-G4QaBPCS::GeCS:UseCurP="<<pMom<<",f="<<fCS<<",I="<<lastI<<",j="<<j<<G4endl;
223	#endif
224	lastCS=CalculateCrossSection(fCS,1,j,PDG,lastZ,lastN,pMom); // Only read and UpdateDB
225	lastP=pMom;
226	}
227	#ifdef debug
228	G4cout<<"==>G4QaBPCS::GetCroSec:P="<<pMom<<"(MeV),CS="<<lastCS*millibarn<<"(mb)"<<G4endl;
229	#endif
230	return lastCS*millibarn;
231	}
232
233	// The main member function giving the gamma-A cross section (E in GeV, CS in mb)
234	G4double G4QAntiBaryonPlusNuclearCrossSection::CalculateCrossSection(G4bool, G4int F, G4int I,
235	G4int, G4int targZ, G4int targN, G4double Momentum)
236	{
237	static const G4double THmin=27.; // default minimum Momentum (MeV/c) Threshold
238	static const G4double THmiG=THmin*.001; // minimum Momentum (GeV/c) Threshold
239	static const G4double dP=10.; // step for the LEN (Low ENergy) table MeV/c
240	static const G4double dPG=dP*.001; // step for the LEN (Low ENergy) table GeV/c
241	static const G4int nL=105; // A#of LEN points in E (step 10 MeV/c)
242	static const G4double Pmin=THmin+(nL-1)*dP; // minP for the HighE part with safety
243	static const G4double Pmax=227000.; // maxP for the HEN (High ENergy) part 227 GeV
244	static const G4int nH=224; // A#of HEN points in lnE
245	static const G4double milP=std::log(Pmin);// Low logarithm energy for the HEN part
246	static const G4double malP=std::log(Pmax);// High logarithm energy (each 2.75 percent)
247	static const G4double dlP=(malP-milP)/(nH-1); // Step in log energy in the HEN part
248	static const G4double milPG=std::log(.001*Pmin);// Low logarithmEnergy for HEN part GeV/c
249	#ifdef debug
250	G4cout<<"G4QaBPNuCS::CalCS:N="<<targN<<",Z="<<targZ<<",P="<<Momentum<<">"<<THmin<<G4endl;
251	#endif
252	G4double sigma=0.;
253	if(F&&I) sigma=0.; // @@ ! Fake line ! to use F & I !!!Temporary!!!
254	G4double A=targN+targZ; // A of the target
255	#ifdef debug
256	G4cout<<"G4QaBarPNucCS::CalCS:A="<<A<<",F="<<F<<",I="<<I<<",nL="<<nL<<",nH="<<nH<<G4endl;
257	#endif
258	if(F<=0) // This isotope was not the last used isotop
259	{
260	if(F<0) // This isotope was found in DAMDB =======> RETRIEVE
261	{
262	G4int sync=LEN->size();
263	if(sync<=I) G4cerr<<"!G4QaBarPNuclCS::CalcCrosSect: Sync="<<sync<<"<="<<I<<G4endl;
264	lastLEN=(*LEN)[I]; // Pointer to prepared LowEnergy cross sections
265	lastHEN=(*HEN)[I]; // Pointer to prepared High Energy cross sections
266	}
267	else // This isotope wasn't calculated before => CREATE
268	{
269	lastLEN = new G4double[nL]; // Allocate memory for the new LEN cross sections
270	lastHEN = new G4double[nH]; // Allocate memory for the new HEN cross sections
271	// --- Instead of making a separate function ---
272	G4double P=THmiG; // Table threshold in GeV/c
273	for(G4int m=0; m<nL; m++)
274	{
275	lastLEN[m] = CrossSectionLin(targZ, targN, P);
276	P+=dPG;
277	}
278	G4double lP=milPG;
279	for(G4int n=0; n<nH; n++)
280	{
281	lastHEN[n] = CrossSectionLog(targZ, targN, lP);
282	lP+=dlP;
283	}
284	#ifdef debug
285	G4cout<<"-*->G4QaBarPNucCS::CalCS:Tab for Z="<<targZ<<",N="<<targN<<",I="<<I<<G4endl;
286	#endif
287	// --- End of possible separate function
288	// * The synchronization check *
289	G4int sync=LEN->size();
290	if(sync!=I)
291	{
292	G4cerr<<"***G4QaBarPNuclCS::CalcCrossSect: Sinc="<<sync<<"#"<<I<<", Z=" <<targZ
293	<<", N="<<targN<<", F="<<F<<G4endl;
294	//G4Exception("G4PiMinusNuclearCS::CalculateCS:","39",FatalException,"DBoverflow");
295	}
296	LEN->push_back(lastLEN); // remember the Low Energy Table
297	HEN->push_back(lastHEN); // remember the High Energy Table
298	} // End of creation of the new set of parameters
299	} // End of parameters udate
300	// ============================== NOW the Magic Formula =================================
301	#ifdef debug
302	G4cout<<"G4QaBPNCS::CalCS:lTH="<<lastTH<<",Pmi="<<Pmin<<",dP="<<dP<<",dlP="<<dlP<<G4endl;
303	#endif
304	if (Momentum<lastTH) return 0.; // It must be already checked in the interface class
305	else if (Momentum<Pmin) // High Energy region
306	{
307	#ifdef debug
308	G4cout<<"G4QaBPNCS::CalcCS:bLEN A="<<A<<", nL="<<nL<<",TH="<<THmin<<",dP="<<dP<<G4endl;
309	#endif
310	if(A<=1.) sigma=0.;
311	else sigma=EquLinearFit(Momentum,nL,THmin,dP,lastLEN);
312	#ifdef debugn
313	if(sigma<0.)
314	G4cout<<"G4QaBPNCS::CalcCS:A="<<A<<",E="<<Momentum<<",T="<<THmin<<",dP="<<dP<<G4endl;
315	#endif
316	}
317	else if (Momentum<Pmax) // High Energy region
318	{
319	G4double lP=std::log(Momentum);
320	#ifdef debug
321	G4cout<<"G4QaBarPNucCS::CalcCS:before HEN nH="<<nH<<",iE="<<milP<<",dlP="<<dlP<<G4endl;
322	#endif
323	sigma=EquLinearFit(lP,nH,milP,dlP,lastHEN);
324	}
325	else // UHE region (calculation, not frequent)
326	{
327	G4double P=0.001*Momentum; // Approximation formula is for P in GeV/c
328	sigma=CrossSectionFormula(targZ, targN, P, std::log(P));
329	}
330	#ifdef debug
331	G4cout<<"G4QAntiBaryonPlusNuclearCrossSection::CalcCS: CS="<<sigma<<G4endl;
332	#endif
333	if(sigma<0.) return 0.;
334	return sigma;
335	}
336
337	// Electromagnetic momentum-threshold (in MeV/c)
338	G4double G4QAntiBaryonPlusNuclearCrossSection::ThresholdMomentum(G4int tZ, G4int tN)
339	{
340	static const G4double third=1./3.;
341	static const G4double prM = G4QPDGCode(2212).GetMass(); // Proton mass in MeV
342	static const G4double pM = G4QPDGCode(3112).GetMass(); // Projectile mass in MeV
343	static const G4double tpM= pM+pM; // Doubled projectile mass (MeV)
344	G4double tA=tZ+tN;
345	if(tZ<.99 \|\| tN<0.) return 0.;
346	G4double dE=tZ/(1.+std::pow(tA,third)); // Safety for diffused edge of the nucleus (QE)
347	G4double tM=931.5*tA;
348	if(tZ==1 && tN==0) tM=prM; // A threshold on the free proton
349	G4double T=dE+dE*(dE/2+pM)/tM;
350	return std::sqrt(T*(tpM+T));
351	}
352
353	// Calculation formula for piMinus-nuclear inelastic cross-section (mb) (P in GeV/c)
354	G4double G4QAntiBaryonPlusNuclearCrossSection::CrossSectionLin(G4int tZ, G4int tN,
355	G4double P)
356	{
357	G4double lP=std::log(P);
358	return CrossSectionFormula(tZ, tN, P, lP);
359	}
360
361	// Calculation formula for piMinus-nuclear inelastic cross-section (mb) log(P in GeV/c)
362	G4double G4QAntiBaryonPlusNuclearCrossSection::CrossSectionLog(G4int tZ, G4int tN,
363	G4double lP)
364	{
365	G4double P=std::exp(lP);
366	return CrossSectionFormula(tZ, tN, P, lP);
367	}
368	// Calculation formula for piMinus-nuclear inelastic cross-section (mb) log(P in GeV/c)
369	G4double G4QAntiBaryonPlusNuclearCrossSection::CrossSectionFormula(G4int tZ, G4int tN,
370	G4double P, G4double lP)
371	{
372	G4double sigma=0.;
373	if(tZ==1 && !tN) // AntiBar-Prot interaction from G4QuasiElRatios
374	{
375	G4double ld=lP-3.5;
376	G4double ld2=ld*ld;
377	G4double ye=std::exp(lP*1.25);
378	G4double yt=std::exp(lP*0.35);
379	G4double El=80./(ye+1.);
380	G4double To=(80./yt+.3)/yt;
381	sigma=(To-El)+.2443*ld2+31.48;
382	}
383	else if(tZ==1 && tN==1)
384	{
385	G4double p2=P*P;
386	G4double p4=p2*p2;
387	G4double r=lP-3.7;
388	sigma=(0.6rr+67.+90.std::exp(-lP.666))/(1.+4.E-7/p4/p4);
389	}
390	else if(tZ<97 && tN<152) // General solution
391	{
392	G4double d=lP-4.2;
393	G4double sp=std::sqrt(P);
394	G4double p2=P*P;
395	G4double p4=p2*p2;
396	G4double a=tN+tZ; // A of the target
397	G4double sa=std::sqrt(a);
398	G4double a2=a*a;
399	G4double a3=a2*a;
400	G4double a4=a2*a2;
401	G4double a2s=a2*sa;
402	G4double c=(170.+3600./a2s)/(1.+65./a2s)+40.*std::pow(a,0.712)/(1.+12.2/a)/(1.+34./a2);
403	G4double r=(170.+0.01*a3)/(1.+a3/28000.);
404	G4double h=.016(1.+1.5E-8a3*a2s)/a4;
405	sigma=(c+d*d+r/sp)/(1.+h/p4/p4);
406	#ifdef pdebug
407	G4cout<<"G4QAntiBarPlNucCS::CSForm: A="<<a<<",P="<<P<<",CS="<<sigma<<",c="<<c<<",g="<<g
408	<<",d="<<d<<",r="<<r<<",e="<<e<<",h="<<h<<G4endl;
409	#endif
410	}
411	else
412	{
413	G4cerr<<"-Warning-G4QAntiBarPlNuclCroSect::CSForm:Bad A Z="<<tZ<<", N="<<tN<<G4endl;
414	sigma=0.;
415	}
416	if(sigma<0.) return 0.;
417	return sigma;
418	}

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