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27 // The lust update: M.V. Kossov, CERN/ITEP(Moscow) 17-June-02
28 //
29 //
30 // G4 Physics class: G4ChipsAntiBaryonInelasticXS for gamma+A cross sections
31 // Created: M.V. Kossov, CERN/ITEP(Moscow), 20-Dec-03
32 // The last update: M.V. Kossov, CERN/ITEP (Moscow) 15-Feb-04
33 //
34 // -------------------------------------------------------------------------------------
35 // Short description: Cross-sections extracted (by W.Pokorski) from the CHIPS package for
36 // anti-baryoninteractions. Original author: M. Kossov
37 // -------------------------------------------------------------------------------------
38 //
39
40 #include "G4ChipsAntiBaryonInelasticXS.hh"
41 #include "G4SystemOfUnits.hh"
42 #include "G4DynamicParticle.hh"
43 #include "G4ParticleDefinition.hh"
44 #include "G4AntiNeutron.hh"
45 #include "G4AntiProton.hh"
46 #include "G4AntiLambda.hh"
47 #include "G4AntiSigmaPlus.hh"
48 #include "G4AntiSigmaMinus.hh"
49 #include "G4AntiSigmaZero.hh"
50 #include "G4AntiXiMinus.hh"
51 #include "G4AntiXiZero.hh"
52 #include "G4AntiOmegaMinus.hh"
53 #include "G4Log.hh"
54 #include "G4Exp.hh"
55 #include "G4Pow.hh"
56
57 // factory
58 #include "G4CrossSectionFactory.hh"
59 //
60 G4_DECLARE_XS_FACTORY(G4ChipsAntiBaryonInelasticXS);
61
62 G4ChipsAntiBaryonInelasticXS::G4ChipsAntiBaryonInelasticXS():G4VCrossSectionDataSet(Default_Name())
63 {
64 lastLEN=0; // Pointer to lastArray of LowEn CS
65 lastHEN=0; // Pointer to lastArray of HighEn CS
66 lastN=0; // The last N of calculated nucleus
67 lastZ=0; // The last Z of calculated nucleus
68 lastP=0.; // Last used Cross Section Momentum
69 lastTH=0.; // Last threshold momentum
70 lastCS=0.; // Last value of the Cross Section
71 lastI=0; // The last position in the DAMDB
72 LEN = new std::vector<G4double*>;
73 HEN = new std::vector<G4double*>;
74 }
75
76 G4ChipsAntiBaryonInelasticXS::~G4ChipsAntiBaryonInelasticXS()
77 {
78 std::size_t lens=LEN->size();
79 for(std::size_t i=0; i<lens; ++i) delete[] (*LEN)[i];
80 delete LEN;
81 std::size_t hens=HEN->size();
82 for(std::size_t i=0; i<hens; ++i) delete[] (*HEN)[i];
83 delete HEN;
84 }
85
86 void G4ChipsAntiBaryonInelasticXS::CrossSectionDescription(std::ostream& outFile) const
87 {
88 outFile << "G4ChipsAntiBaryonInelasticXS provides the inelastic cross\n"
89 << "section for anti-baryon nucleus scattering as a function of incident\n"
90 << "momentum. The cross section is calculated using M. Kossov's\n"
91 << "CHIPS parameterization of cross section data.\n";
92 }
93
94
95 G4bool G4ChipsAntiBaryonInelasticXS::IsIsoApplicable(const G4DynamicParticle*, G4int, G4int,
96 const G4Element*,
97 const G4Material*)
98 {
99 /*
100 const G4ParticleDefinition* particle = Pt->GetDefinition();
101
102 if(particle == G4AntiNeutron::AntiNeutron())
103 {
104 return true;
105 }
106 else if(particle == G4AntiProton::AntiProton())
107 {
108 return true;
109 }
110 else if(particle == G4AntiLambda::AntiLambda())
111 {
112 return true;
113 }
114 else if(particle == G4AntiSigmaPlus::AntiSigmaPlus())
115 {
116 return true;
117 }
118 else if(particle == G4AntiSigmaMinus::AntiSigmaMinus())
119 {
120 return true;
121 }
122 else if(particle == G4AntiSigmaZero::AntiSigmaZero())
123 {
124 return true;
125 }
126 else if(particle == G4AntiXiMinus::AntiXiMinus())
127 {
128 return true;
129 }
130 else if(particle == G4AntiXiZero::AntiXiZero())
131 {
132 return true;
133 }
134 else if(particle == G4AntiOmegaMinus::AntiOmegaMinus())
135 {
136 return true;
137 }
138 */
139 return true;
140 }
141
142 // The main member function giving the collision cross section (P is in IU, CS is in mb)
143 // Make pMom in independent units ! (Now it is MeV)
144 G4double G4ChipsAntiBaryonInelasticXS::GetIsoCrossSection(const G4DynamicParticle* Pt, G4int tgZ, G4int A,
145 const G4Isotope*,
146 const G4Element*,
147 const G4Material*)
148 {
149 G4double pMom=Pt->GetTotalMomentum();
150 G4int tgN = A - tgZ;
151 G4int pdg = Pt->GetDefinition()->GetPDGEncoding();
152
153 return GetChipsCrossSection(pMom, tgZ, tgN, pdg);
154 }
155
156 G4double G4ChipsAntiBaryonInelasticXS::GetChipsCrossSection(G4double pMom, G4int tgZ, G4int tgN, G4int cPDG)
157 {
158
159 G4bool in=false; // By default the isotope must be found in the AMDB
160 if(tgN!=lastN || tgZ!=lastZ) // The nucleus was not the last used isotope
161 {
162 in = false; // By default the isotope haven't be found in AMDB
163 lastP = 0.; // New momentum history (nothing to compare with)
164 lastN = tgN; // The last N of the calculated nucleus
165 lastZ = tgZ; // The last Z of the calculated nucleus
166 lastI = (G4int)colN.size(); // Size of the Associative Memory DB in the heap
167 j = 0; // A#0f records found in DB for this projectile
168 if(lastI) for(G4int i=0; i<lastI; i++) // AMDB exists, try to find the (Z,N) isotope
169 {
170 if(colN[i]==tgN && colZ[i]==tgZ) // Try the record "i" in the AMDB
171 {
172 lastI=i; // Remember the index for future fast/last use
173 lastTH =colTH[i]; // The last THreshold (A-dependent)
174 if(pMom<=lastTH)
175 {
176 return 0.; // Energy is below the Threshold value
177 }
178 lastP =colP [i]; // Last Momentum (A-dependent)
179 lastCS =colCS[i]; // Last CrossSect (A-dependent)
180 in = true; // This is the case when the isotop is found in DB
181 // Momentum pMom is in IU ! @@ Units
182 lastCS=CalculateCrossSection(-1,j,cPDG,lastZ,lastN,pMom); // read & update
183 if(lastCS<=0. && pMom>lastTH) // Correct the threshold (@@ No intermediate Zeros)
184 {
185 lastCS=0.;
186 lastTH=pMom;
187 }
188 break; // Go out of the LOOP
189 }
190 j++; // Increment a#0f records found in DB
191 }
192 if(!in) // This isotope has not been calculated previously
193 {
194 //!!The slave functions must provide cross-sections in millibarns (mb) !! (not in IU)
195 lastCS=CalculateCrossSection(0,j,cPDG,lastZ,lastN,pMom); //calculate & create
196 //if(lastCS>0.) // It means that the AMBD was initialized
197 //{
198
199 lastTH = 0; //ThresholdEnergy(tgZ, tgN); // The Threshold Energy which is now the last
200 colN.push_back(tgN);
201 colZ.push_back(tgZ);
202 colP.push_back(pMom);
203 colTH.push_back(lastTH);
204 colCS.push_back(lastCS);
205 //} // M.K. Presence of H1 with high threshold breaks the syncronization
206 return lastCS*millibarn;
207 } // End of creation of the new set of parameters
208 else
209 {
210 colP[lastI]=pMom;
211 colCS[lastI]=lastCS;
212 }
213 } // End of parameters udate
214 else if(pMom<=lastTH)
215 {
216 return 0.; // Momentum is below the Threshold Value -> CS=0
217 }
218 else // It is the last used -> use the current tables
219 {
220 lastCS=CalculateCrossSection(1,j,cPDG,lastZ,lastN,pMom); // Only read and UpdateDB
221 lastP=pMom;
222 }
223 return lastCS*millibarn;
224 }
225
226 // The main member function giving the gamma-A cross section (E in GeV, CS in mb)
227 G4double G4ChipsAntiBaryonInelasticXS::CalculateCrossSection(G4int F, G4int I,
228 G4int, G4int targZ, G4int targN, G4double Momentum)
229 {
230 static const G4double THmin=27.; // default minimum Momentum (MeV/c) Threshold
231 static const G4double THmiG=THmin*.001; // minimum Momentum (GeV/c) Threshold
232 static const G4double dP=10.; // step for the LEN (Low ENergy) table MeV/c
233 static const G4double dPG=dP*.001; // step for the LEN (Low ENergy) table GeV/c
234 static const G4int nL=105; // A#of LEN points in E (step 10 MeV/c)
235 static const G4double Pmin=THmin+(nL-1)*dP; // minP for the HighE part with safety
236 static const G4double Pmax=227000.; // maxP for the HEN (High ENergy) part 227 GeV
237 static const G4int nH=224; // A#of HEN points in lnE
238 static const G4double milP=G4Log(Pmin);// Low logarithm energy for the HEN part
239 static const G4double malP=G4Log(Pmax);// High logarithm energy (each 2.75 percent)
240 static const G4double dlP=(malP-milP)/(nH-1); // Step in log energy in the HEN part
241 static const G4double milPG=G4Log(.001*Pmin);// Low logarithmEnergy for HEN part GeV/c
242 if(F<=0) // This isotope was not the last used isotop
243 {
244 if(F<0) // This isotope was found in DAMDB =-----=> RETRIEVE
245 {
246 G4int sync=(G4int)LEN->size();
247 if(sync<=I) G4cerr<<"*!*G4QPiMinusNuclCS::CalcCrosSect:Sync="<<sync<<"<="<<I<<G4endl;
248 lastLEN=(*LEN)[I]; // Pointer to prepared LowEnergy cross sections
249 lastHEN=(*HEN)[I]; // Pointer to prepared High Energy cross sections
250 }
251 else // This isotope wasn't calculated before => CREATE
252 {
253 lastLEN = new G4double[nL]; // Allocate memory for the new LEN cross sections
254 lastHEN = new G4double[nH]; // Allocate memory for the new HEN cross sections
255 // --- Instead of making a separate function ---
256 G4double P=THmiG; // Table threshold in GeV/c
257 for(G4int k=0; k<nL; k++)
258 {
259 lastLEN[k] = CrossSectionLin(targZ, targN, P);
260 P+=dPG;
261 }
262 G4double lP=milPG;
263 for(G4int n=0; n<nH; n++)
264 {
265 lastHEN[n] = CrossSectionLog(targZ, targN, lP);
266 lP+=dlP;
267 }
268 // --- End of possible separate function
269 // *** The synchronization check ***
270 G4int sync=(G4int)LEN->size();
271 if(sync!=I)
272 {
273 G4cerr<<"***G4QPiMinusNuclCS::CalcCrossSect: Sinc="<<sync<<"#"<<I<<", Z=" <<targZ
274 <<", N="<<targN<<", F="<<F<<G4endl;
275 //G4Exception("G4PiMinusNuclearCS::CalculateCS:","39",FatalException,"DBoverflow");
276 }
277 LEN->push_back(lastLEN); // remember the Low Energy Table
278 HEN->push_back(lastHEN); // remember the High Energy Table
279 } // End of creation of the new set of parameters
280 } // End of parameters udate
281 // =-------------------= NOW the Magic Formula =--------------------=
282 G4double sigma;
283 if (Momentum<lastTH) return 0.; // It must be already checked in the interface class
284 else if (Momentum<Pmin) // High Energy region
285 {
286 sigma=EquLinearFit(Momentum,nL,THmin,dP,lastLEN);
287 }
288 else if (Momentum<Pmax) // High Energy region
289 {
290 G4double lP=G4Log(Momentum);
291 sigma=EquLinearFit(lP,nH,milP,dlP,lastHEN);
292 }
293 else // UHE region (calculation, not frequent)
294 {
295 G4double P=0.001*Momentum; // Approximation formula is for P in GeV/c
296 sigma=CrossSectionFormula(targZ, targN, P, G4Log(P));
297 }
298 if(sigma<0.) return 0.;
299 return sigma;
300 }
301
302 // Calculation formula for piMinus-nuclear inelastic cross-section (mb) (P in GeV/c)
303 G4double G4ChipsAntiBaryonInelasticXS::CrossSectionLin(G4int tZ, G4int tN, G4double P)
304 {
305 G4double lP=G4Log(P);
306 return CrossSectionFormula(tZ, tN, P, lP);
307 }
308
309 // Calculation formula for piMinus-nuclear inelastic cross-section (mb) log(P in GeV/c)
310 G4double G4ChipsAntiBaryonInelasticXS::CrossSectionLog(G4int tZ, G4int tN, G4double lP)
311 {
312 G4double P=G4Exp(lP);
313 return CrossSectionFormula(tZ, tN, P, lP);
314 }
315 // Calculation formula for piMinus-nuclear inelastic cross-section (mb) log(P in GeV/c)
316 G4double G4ChipsAntiBaryonInelasticXS::CrossSectionFormula(G4int tZ, G4int tN,
317 G4double P, G4double lP)
318 {
319 G4double sigma=0.;
320 if(tZ==1 && !tN) // AntiBar-Prot interaction from G4QuasiElRatios
321 {
322 G4double ld=lP-3.5;
323 G4double ld2=ld*ld;
324 G4double ye=G4Exp(lP*1.25);
325 G4double yt=G4Exp(lP*0.35);
326 G4double El=80./(ye+1.);
327 G4double To=(80./yt+.3)/yt;
328 sigma=(To-El)+.2443*ld2+31.48;
329 }
330 else if(tZ==1 && tN==1)
331 {
332 G4double r=lP-3.7;
333 sigma=0.6*r*r+67.+90.*G4Exp(-lP*.666);
334 }
335 else if(tZ<97 && tN<152) // General solution
336 {
337 G4double d=lP-4.2;
338 G4double sp=std::sqrt(P);
339 G4double a=tN+tZ; // A of the target
340 G4double sa=std::sqrt(a);
341 G4double a2=a*a;
342 G4double a3=a2*a;
343 G4double a2s=a2*sa;
344 G4double c=(170.+3600./a2s)/(1.+65./a2s)+40.*G4Pow::GetInstance()->powA(a,0.712)/(1.+12.2/a)/(1.+34./a2);
345 G4double r=(170.+0.01*a3)/(1.+a3/28000.);
346 sigma=c+d*d+r/sp;
347 }
348 else
349 {
350 G4cerr<<"-Warning-G4QAntiBarNuclearCroSect::CSForm:*Bad A* Z="<<tZ<<", N="<<tN<<G4endl;
351 sigma=0.;
352 }
353 if(sigma<0.) return 0.;
354 return sigma;
355 }
356
357 G4double G4ChipsAntiBaryonInelasticXS::EquLinearFit(G4double X, G4int N, G4double X0, G4double DX, G4double* Y)
358 {
359 if(DX<=0. || N<2)
360 {
361 G4cerr<<"***G4ChipsAntiBaryonInelasticXS::EquLinearFit: DX="<<DX<<", N="<<N<<G4endl;
362 return Y[0];
363 }
364
365 G4int N2=N-2;
366 G4double d=(X-X0)/DX;
367 G4int jj=static_cast<int>(d);
368 if (jj<0) jj=0;
369 else if(jj>N2) jj=N2;
370 d-=jj; // excess
371 G4double yi=Y[jj];
372 G4double sigma=yi+(Y[jj+1]-yi)*d;
373
374 return sigma;
375 }
376