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26 // 26 //
27 // The lust update: M.V. Kossov, CERN/ITEP(Mos 27 // The lust update: M.V. Kossov, CERN/ITEP(Moscow) 17-June-02
28 // 28 //
29 // 29 //
30 // G4 Physics class: G4ChipsKaonMinusInelastic 30 // G4 Physics class: G4ChipsKaonMinusInelasticXS for gamma+A cross sections
31 // Created: M.V. Kossov, CERN/ITEP(Moscow), 20 31 // Created: M.V. Kossov, CERN/ITEP(Moscow), 20-Dec-03
32 // The last update: M.V. Kossov, CERN/ITEP (Mo 32 // The last update: M.V. Kossov, CERN/ITEP (Moscow) 15-Feb-04
33 // ------------------------------------------- 33 // --------------------------------------------------------------------------------
34 // Short description: Cross-sections extracted 34 // Short description: Cross-sections extracted from the CHIPS package for
35 // kaon(minus)-nuclear interactions. Author: M 35 // kaon(minus)-nuclear interactions. Author: M. Kossov
36 // ------------------------------------------- 36 // -------------------------------------------------------------------------------------
37 // 37 //
38 38
39 #include "G4ChipsKaonMinusInelasticXS.hh" 39 #include "G4ChipsKaonMinusInelasticXS.hh"
40 #include "G4SystemOfUnits.hh" 40 #include "G4SystemOfUnits.hh"
41 #include "G4DynamicParticle.hh" 41 #include "G4DynamicParticle.hh"
42 #include "G4ParticleDefinition.hh" 42 #include "G4ParticleDefinition.hh"
43 #include "G4KaonMinus.hh" 43 #include "G4KaonMinus.hh"
44 44
45 // factory 45 // factory
46 #include "G4CrossSectionFactory.hh" 46 #include "G4CrossSectionFactory.hh"
47 // 47 //
48 G4_DECLARE_XS_FACTORY(G4ChipsKaonMinusInelasti 48 G4_DECLARE_XS_FACTORY(G4ChipsKaonMinusInelasticXS);
49 49
50 namespace { 50 namespace {
51 const G4double THmin=27.; // default m 51 const G4double THmin=27.; // default minimum Momentum (MeV/c) Threshold
52 const G4double THmiG=THmin*.001; // minimu 52 const G4double THmiG=THmin*.001; // minimum Momentum (GeV/c) Threshold
53 const G4double dP=10.; // step for 53 const G4double dP=10.; // step for the LEN (Low ENergy) table MeV/c
54 const G4double dPG=dP*.001; // step for 54 const G4double dPG=dP*.001; // step for the LEN (Low ENergy) table GeV/c
55 const G4int nL=105; // A#of LEN 55 const G4int nL=105; // A#of LEN points in E (step 10 MeV/c)
56 const G4double Pmin=THmin+(nL-1)*dP; // mi 56 const G4double Pmin=THmin+(nL-1)*dP; // minP for the HighE part with safety
57 const G4double Pmax=227000.; // maxP for 57 const G4double Pmax=227000.; // maxP for the HEN (High ENergy) part 227 GeV
58 const G4int nH=224; // A#of HEN 58 const G4int nH=224; // A#of HEN points in lnE
59 const G4double milP=std::log(Pmin);// Low 59 const G4double milP=std::log(Pmin);// Low logarithm energy for the HEN part
60 const G4double malP=std::log(Pmax);// High 60 const G4double malP=std::log(Pmax);// High logarithm energy (each 2.75 percent)
61 const G4double dlP=(malP-milP)/(nH-1); // 61 const G4double dlP=(malP-milP)/(nH-1); // Step in log energy in the HEN part
62 const G4double milPG=std::log(.001*Pmin);/ 62 const G4double milPG=std::log(.001*Pmin);// Low logarithmEnergy for HEN part GeV/c
63 } 63 }
64 // Initialization of the 64 // Initialization of the
65 65
66 G4ChipsKaonMinusInelasticXS::G4ChipsKaonMinusI 66 G4ChipsKaonMinusInelasticXS::G4ChipsKaonMinusInelasticXS():G4VCrossSectionDataSet(Default_Name())
67 { 67 {
68 lastLEN=0; // Pointer to lastArray of LowEn 68 lastLEN=0; // Pointer to lastArray of LowEn CS
69 lastHEN=0; // Pointer to lastArray of HighEn 69 lastHEN=0; // Pointer to lastArray of HighEn CS
70 lastN=0; // The last N of calculated nucle 70 lastN=0; // The last N of calculated nucleus
71 lastZ=0; // The last Z of calculated nucle 71 lastZ=0; // The last Z of calculated nucleus
72 lastP=0.; // Last used in CrossSection Mome 72 lastP=0.; // Last used in CrossSection Momentum
73 lastTH=0.; // Last threshold momentum 73 lastTH=0.; // Last threshold momentum
74 lastCS=0.; // Last value of the Cross Sectio 74 lastCS=0.; // Last value of the Cross Section
75 lastI=0; // The last position in the DAMDB 75 lastI=0; // The last position in the DAMDB
76 LEN = new std::vector<G4double*>; 76 LEN = new std::vector<G4double*>;
77 HEN = new std::vector<G4double*>; 77 HEN = new std::vector<G4double*>;
78 } 78 }
79 79
80 G4ChipsKaonMinusInelasticXS::~G4ChipsKaonMinus 80 G4ChipsKaonMinusInelasticXS::~G4ChipsKaonMinusInelasticXS()
81 { 81 {
82 std::size_t lens=LEN->size(); 82 std::size_t lens=LEN->size();
83 for(std::size_t i=0; i<lens; ++i) delete[] ( 83 for(std::size_t i=0; i<lens; ++i) delete[] (*LEN)[i];
84 delete LEN; 84 delete LEN;
85 85
86 std::size_t hens=HEN->size(); 86 std::size_t hens=HEN->size();
87 for(std::size_t i=0; i<hens; ++i) delete[] ( 87 for(std::size_t i=0; i<hens; ++i) delete[] (*HEN)[i];
88 delete HEN; 88 delete HEN;
89 } 89 }
90 90
91 void 91 void
92 G4ChipsKaonMinusInelasticXS::CrossSectionDescr 92 G4ChipsKaonMinusInelasticXS::CrossSectionDescription(std::ostream& outFile) const
93 { 93 {
94 outFile << "G4ChipsKaonMinusInelasticXS pr 94 outFile << "G4ChipsKaonMinusInelasticXS provides the inelastic cross\n"
95 << "section for K- nucleus scatter 95 << "section for K- nucleus scattering as a function of incident\n"
96 << "momentum. The cross section is 96 << "momentum. The cross section is calculated using M. Kossov's\n"
97 << "CHIPS parameterization of cros 97 << "CHIPS parameterization of cross section data.\n";
98 } 98 }
99 99
100 G4bool G4ChipsKaonMinusInelasticXS::IsIsoAppli 100 G4bool G4ChipsKaonMinusInelasticXS::IsIsoApplicable(const G4DynamicParticle*, G4int, G4int,
101 const G4Element*, 101 const G4Element*,
102 const G4Material*) 102 const G4Material*)
103 { 103 {
104 return true; 104 return true;
105 } 105 }
106 106
107 107
108 // The main member function giving the collisi 108 // The main member function giving the collision cross section (P is in IU, CS is in mb)
109 // Make pMom in independent units ! (Now it is 109 // Make pMom in independent units ! (Now it is MeV)
110 G4double G4ChipsKaonMinusInelasticXS::GetIsoCr 110 G4double G4ChipsKaonMinusInelasticXS::GetIsoCrossSection(const G4DynamicParticle* Pt, G4int tgZ, G4int A,
111 const G4Isotope*, 111 const G4Isotope*,
112 const G4Element*, 112 const G4Element*,
113 const G4Material*) 113 const G4Material*)
114 { 114 {
115 G4double pMom=Pt->GetTotalMomentum(); 115 G4double pMom=Pt->GetTotalMomentum();
116 G4int tgN = A - tgZ; 116 G4int tgN = A - tgZ;
117 117
118 return GetChipsCrossSection(pMom, tgZ, tgN, 118 return GetChipsCrossSection(pMom, tgZ, tgN, -321);
119 } 119 }
120 120
121 G4double G4ChipsKaonMinusInelasticXS::GetChips 121 G4double G4ChipsKaonMinusInelasticXS::GetChipsCrossSection(G4double pMom, G4int tgZ, G4int tgN, G4int)
122 { 122 {
123 G4bool in=false; // By d 123 G4bool in=false; // By default the isotope must be found in the AMDB
124 if(tgN!=lastN || tgZ!=lastZ) // The 124 if(tgN!=lastN || tgZ!=lastZ) // The nucleus was not the last used isotope
125 { 125 {
126 in = false; // By d 126 in = false; // By default the isotope haven't be found in AMDB
127 lastP = 0.; // New 127 lastP = 0.; // New momentum history (nothing to compare with)
128 lastN = tgN; // The 128 lastN = tgN; // The last N of the calculated nucleus
129 lastZ = tgZ; // The 129 lastZ = tgZ; // The last Z of the calculated nucleus
130 lastI = (G4int)colN.size(); // Size 130 lastI = (G4int)colN.size(); // Size of the Associative Memory DB in the heap
131 j = 0; // A#0f 131 j = 0; // A#0f records found in DB for this projectile
132 if(lastI) for(G4int i=0; i<lastI; ++i) // 132 if(lastI) for(G4int i=0; i<lastI; ++i) // AMDB exists, try to find the (Z,N) isotope
133 { 133 {
134 if(colN[i]==tgN && colZ[i]==tgZ) // Try 134 if(colN[i]==tgN && colZ[i]==tgZ) // Try the record "i" in the AMDB
135 { 135 {
136 lastI=i; // Reme 136 lastI=i; // Remember the index for future fast/last use
137 lastTH =colTH[i]; // The 137 lastTH =colTH[i]; // The last THreshold (A-dependent)
138 if(pMom<=lastTH) 138 if(pMom<=lastTH)
139 { 139 {
140 return 0.; // Ener 140 return 0.; // Energy is below the Threshold value
141 } 141 }
142 lastP =colP [i]; // Last 142 lastP =colP [i]; // Last Momentum (A-dependent)
143 lastCS =colCS[i]; // Last 143 lastCS =colCS[i]; // Last CrossSect (A-dependent)
144 in = true; // This 144 in = true; // This is the case when the isotop is found in DB
145 // Momentum pMom is in IU ! @@ Units 145 // Momentum pMom is in IU ! @@ Units
146 lastCS=CalculateCrossSection(-1,j,-321 146 lastCS=CalculateCrossSection(-1,j,-321,lastZ,lastN,pMom); // read & update
147 if(lastCS<=0. && pMom>lastTH) // Corr 147 if(lastCS<=0. && pMom>lastTH) // Correct the threshold (@@ No intermediate Zeros)
148 { 148 {
149 lastCS=0.; 149 lastCS=0.;
150 lastTH=pMom; 150 lastTH=pMom;
151 } 151 }
152 break; // Go o 152 break; // Go out of the LOOP
153 } 153 }
154 j++; // Incr 154 j++; // Increment a#0f records found in DB
155 } 155 }
156 if(!in) // This 156 if(!in) // This isotope has not been calculated previously
157 { 157 {
158 //!!The slave functions must provide cro 158 //!!The slave functions must provide cross-sections in millibarns (mb) !! (not in IU)
159 lastCS=CalculateCrossSection(0,j,-321,la 159 lastCS=CalculateCrossSection(0,j,-321,lastZ,lastN,pMom); //calculate & create
160 //if(lastCS>0.) // It 160 //if(lastCS>0.) // It means that the AMBD was initialized
161 //{ 161 //{
162 162
163 // lastTH = ThresholdEnergy(tgZ, 163 // lastTH = ThresholdEnergy(tgZ, tgN); // The Threshold Energy which is now the last
164 164
165 lastTH = 0; // WP - to be checked!!! 165 lastTH = 0; // WP - to be checked!!!
166 colN.push_back(tgN); 166 colN.push_back(tgN);
167 colZ.push_back(tgZ); 167 colZ.push_back(tgZ);
168 colP.push_back(pMom); 168 colP.push_back(pMom);
169 colTH.push_back(lastTH); 169 colTH.push_back(lastTH);
170 colCS.push_back(lastCS); 170 colCS.push_back(lastCS);
171 //} // M.K. Presence of H1 with high thr 171 //} // M.K. Presence of H1 with high threshold breaks the syncronization
172 return lastCS*millibarn; 172 return lastCS*millibarn;
173 } // End of creation of the new set of par 173 } // End of creation of the new set of parameters
174 else 174 else
175 { 175 {
176 colP[lastI]=pMom; 176 colP[lastI]=pMom;
177 colCS[lastI]=lastCS; 177 colCS[lastI]=lastCS;
178 } 178 }
179 } // End of parameters udate 179 } // End of parameters udate
180 else if(pMom<=lastTH) 180 else if(pMom<=lastTH)
181 { 181 {
182 return 0.; // Mome 182 return 0.; // Momentum is below the Threshold Value -> CS=0
183 } 183 }
184 else // It i 184 else // It is the last used -> use the current tables
185 { 185 {
186 lastCS=CalculateCrossSection(1,j,-321,last 186 lastCS=CalculateCrossSection(1,j,-321,lastZ,lastN,pMom); // Only read and UpdateDB
187 lastP=pMom; 187 lastP=pMom;
188 } 188 }
189 return lastCS*millibarn; 189 return lastCS*millibarn;
190 } 190 }
191 191
192 // The main member function giving the gamma-A 192 // The main member function giving the gamma-A cross section (E in GeV, CS in mb)
193 G4double G4ChipsKaonMinusInelasticXS::Calculat 193 G4double G4ChipsKaonMinusInelasticXS::CalculateCrossSection(G4int F, G4int I,
194 G4int, 194 G4int, G4int targZ, G4int targN, G4double Momentum)
195 { 195 {
>> 196 G4double sigma=0.;
>> 197 if(F&&I) sigma=0.; // @@ *!* Fake line *!* to use F & I !!!Temporary!!!
>> 198 //G4double A=targN+targZ; // A of the target
196 if(F<=0) // This 199 if(F<=0) // This isotope was not the last used isotop
197 { 200 {
198 if(F<0) // This 201 if(F<0) // This isotope was found in DAMDB =-----=> RETRIEVE
199 { 202 {
200 G4int sync=(G4int)LEN->size(); 203 G4int sync=(G4int)LEN->size();
201 if(sync<=I) G4cerr<<"*!*G4QPiMinusNuclCS 204 if(sync<=I) G4cerr<<"*!*G4QPiMinusNuclCS::CalcCrosSect:Sync="<<sync<<"<="<<I<<G4endl;
202 lastLEN=(*LEN)[I]; // Poi 205 lastLEN=(*LEN)[I]; // Pointer to prepared LowEnergy cross sections
203 lastHEN=(*HEN)[I]; // Poi 206 lastHEN=(*HEN)[I]; // Pointer to prepared High Energy cross sections
204 } 207 }
205 else // This 208 else // This isotope wasn't calculated before => CREATE
206 { 209 {
207 lastLEN = new G4double[nL]; // Allo 210 lastLEN = new G4double[nL]; // Allocate memory for the new LEN cross sections
208 lastHEN = new G4double[nH]; // Allo 211 lastHEN = new G4double[nH]; // Allocate memory for the new HEN cross sections
209 // --- Instead of making a separate func 212 // --- Instead of making a separate function ---
210 G4double P=THmiG; // Tabl 213 G4double P=THmiG; // Table threshold in GeV/c
211 for(G4int k=0; k<nL; k++) 214 for(G4int k=0; k<nL; k++)
212 { 215 {
213 lastLEN[k] = CrossSectionLin(targZ, ta 216 lastLEN[k] = CrossSectionLin(targZ, targN, P);
214 P+=dPG; 217 P+=dPG;
215 } 218 }
216 G4double lP=milPG; 219 G4double lP=milPG;
217 for(G4int n=0; n<nH; n++) 220 for(G4int n=0; n<nH; n++)
218 { 221 {
219 lastHEN[n] = CrossSectionLog(targZ, ta 222 lastHEN[n] = CrossSectionLog(targZ, targN, lP);
220 lP+=dlP; 223 lP+=dlP;
221 } 224 }
222 // --- End of possible separate function 225 // --- End of possible separate function
223 // *** The synchronization check *** 226 // *** The synchronization check ***
224 G4int sync=(G4int)LEN->size(); 227 G4int sync=(G4int)LEN->size();
225 if(sync!=I) 228 if(sync!=I)
226 { 229 {
227 G4cerr<<"***G4ChipsKaonMinusCS::CalcCr 230 G4cerr<<"***G4ChipsKaonMinusCS::CalcCrossSect: Sinc="<<sync<<"#"<<I<<", Z=" <<targZ
228 <<", N="<<targN<<", F="<<F<<G4en 231 <<", N="<<targN<<", F="<<F<<G4endl;
229 //G4Exception("G4PiMinusNuclearCS::Cal 232 //G4Exception("G4PiMinusNuclearCS::CalculateCS:","39",FatalException,"DBoverflow");
230 } 233 }
231 LEN->push_back(lastLEN); // reme 234 LEN->push_back(lastLEN); // remember the Low Energy Table
232 HEN->push_back(lastHEN); // reme 235 HEN->push_back(lastHEN); // remember the High Energy Table
233 } // End of creation of the new set of par 236 } // End of creation of the new set of parameters
234 } // End of parameters update << 237 } // End of parameters udate
235 // =------------------= NOW the Magic Formul 238 // =------------------= NOW the Magic Formula =--------------------------=
236 G4double sigma; <<
237 if (Momentum<lastTH) return 0.; // It m 239 if (Momentum<lastTH) return 0.; // It must be already checked in the interface class
238 else if (Momentum<Pmin) // High 240 else if (Momentum<Pmin) // High Energy region
239 { 241 {
240 sigma=EquLinearFit(Momentum,nL,THmin,dP,la 242 sigma=EquLinearFit(Momentum,nL,THmin,dP,lastLEN);
241 } 243 }
242 else if (Momentum<Pmax) // High 244 else if (Momentum<Pmax) // High Energy region
243 { 245 {
244 G4double lP=std::log(Momentum); 246 G4double lP=std::log(Momentum);
245 sigma=EquLinearFit(lP,nH,milP,dlP,lastHEN) 247 sigma=EquLinearFit(lP,nH,milP,dlP,lastHEN);
246 } 248 }
247 else // UHE 249 else // UHE region (calculation, not frequent)
248 { 250 {
249 G4double P=0.001*Momentum; // Appr 251 G4double P=0.001*Momentum; // Approximation formula is for P in GeV/c
250 sigma=CrossSectionFormula(targZ, targN, P, 252 sigma=CrossSectionFormula(targZ, targN, P, std::log(P));
251 } 253 }
252 if(sigma<0.) return 0.; 254 if(sigma<0.) return 0.;
253 return sigma; 255 return sigma;
254 } 256 }
255 257
256 // Calculation formula for piMinus-nuclear ine 258 // Calculation formula for piMinus-nuclear inelastic cross-section (mb) (P in GeV/c)
257 G4double G4ChipsKaonMinusInelasticXS::CrossSec 259 G4double G4ChipsKaonMinusInelasticXS::CrossSectionLin(G4int tZ, G4int tN, G4double P)
258 { 260 {
259 G4double lP=std::log(P); 261 G4double lP=std::log(P);
260 return CrossSectionFormula(tZ, tN, P, lP); 262 return CrossSectionFormula(tZ, tN, P, lP);
261 } 263 }
262 264
263 // Calculation formula for piMinus-nuclear ine 265 // Calculation formula for piMinus-nuclear inelastic cross-section (mb) log(P in GeV/c)
264 G4double G4ChipsKaonMinusInelasticXS::CrossSec 266 G4double G4ChipsKaonMinusInelasticXS::CrossSectionLog(G4int tZ, G4int tN, G4double lP)
265 { 267 {
266 G4double P=std::exp(lP); 268 G4double P=std::exp(lP);
267 return CrossSectionFormula(tZ, tN, P, lP); 269 return CrossSectionFormula(tZ, tN, P, lP);
268 } 270 }
269 // Calculation formula for piMinus-nuclear ine 271 // Calculation formula for piMinus-nuclear inelastic cross-section (mb) log(P in GeV/c)
270 G4double G4ChipsKaonMinusInelasticXS::CrossSec 272 G4double G4ChipsKaonMinusInelasticXS::CrossSectionFormula(G4int tZ, G4int tN,
271 273 G4double P, G4double lP)
272 { 274 {
273 G4double sigma=0.; 275 G4double sigma=0.;
274 if(tZ==1 && !tN) // P 276 if(tZ==1 && !tN) // PiMin-Proton interaction from G4QuasiElRatios
275 { 277 {
276 G4double ld=lP-3.5; 278 G4double ld=lP-3.5;
277 G4double ld2=ld*ld; 279 G4double ld2=ld*ld;
278 G4double p2=P*P; 280 G4double p2=P*P;
279 G4double p4=p2*p2; 281 G4double p4=p2*p2;
280 G4double sp=std::sqrt(P); 282 G4double sp=std::sqrt(P);
281 G4double psp=P*sp; 283 G4double psp=P*sp;
282 G4double lm=P-.39; 284 G4double lm=P-.39;
283 G4double md=lm*lm+.000156; 285 G4double md=lm*lm+.000156;
284 G4double lh=P-1.; 286 G4double lh=P-1.;
285 G4double hd=lh*lh+.0156; 287 G4double hd=lh*lh+.0156;
286 G4double El=(.0557*ld2+2.23)/(1.-.7/sp+.07 288 G4double El=(.0557*ld2+2.23)/(1.-.7/sp+.075/p4);
287 G4double To=(.3*ld2+19.5)/(1.-.21/sp+.52/p 289 G4double To=(.3*ld2+19.5)/(1.-.21/sp+.52/p4);
288 sigma=8.8/psp+(To-El)+.002/md+.15/hd; 290 sigma=8.8/psp+(To-El)+.002/md+.15/hd;
289 } 291 }
290 else if(tZ==1 && tN==1) // 292 else if(tZ==1 && tN==1) // kmp_tot
291 { 293 {
292 G4double p2=P*P; 294 G4double p2=P*P;
293 G4double dX=lP-3.7; 295 G4double dX=lP-3.7;
294 G4double dR=P-.94; 296 G4double dR=P-.94;
295 G4double sp=std::sqrt(P); 297 G4double sp=std::sqrt(P);
296 sigma=(.6*dX*dX+36.)/(1.-.11/sp+.52/p2/p2) 298 sigma=(.6*dX*dX+36.)/(1.-.11/sp+.52/p2/p2)+.7/(dR*dR+.0256)+18./P/sp;
297 } 299 }
298 else if(tZ<97 && tN<152) // G 300 else if(tZ<97 && tN<152) // General solution
299 { 301 {
300 G4double d=lP-4.2; 302 G4double d=lP-4.2;
301 G4double sp=std::sqrt(P); 303 G4double sp=std::sqrt(P);
302 G4double p2=P*P; 304 G4double p2=P*P;
303 G4double a=tN+tZ; // 305 G4double a=tN+tZ; // A of the target
304 G4double sa=std::sqrt(a); 306 G4double sa=std::sqrt(a);
305 G4double al=std::log(a); 307 G4double al=std::log(a);
306 G4double a2=a*a; 308 G4double a2=a*a;
307 G4double c=52.*std::exp(al*0.6)*(1.+97./a2 309 G4double c=52.*std::exp(al*0.6)*(1.+97./a2)/(1.+9.8/a)/(1.+47./a2);
308 G4double gg=-.2-.003*a; 310 G4double gg=-.2-.003*a;
309 G4double h=.5+.07*a; 311 G4double h=.5+.07*a;
310 G4double v=P-1.; 312 G4double v=P-1.;
311 G4double f=.6*a*sa/(1.+.00002*a2); 313 G4double f=.6*a*sa/(1.+.00002*a2);
312 G4double u=.125+.127*al; 314 G4double u=.125+.127*al;
313 sigma=(c+d*d)/(1.+gg/sp+h/p2/p2)+f/(v*v+u* 315 sigma=(c+d*d)/(1.+gg/sp+h/p2/p2)+f/(v*v+u*u)+20.*sa/P/sp;
314 } 316 }
315 else 317 else
316 { 318 {
317 G4cerr<<"-Warning-G4ChipsKMinusNuclearCroS 319 G4cerr<<"-Warning-G4ChipsKMinusNuclearCroSect::CSForm:*Bad A* Z="<<tZ<<", N="<<tN<<G4endl;
318 sigma=0.; 320 sigma=0.;
319 } 321 }
320 if(sigma<0.) return 0.; 322 if(sigma<0.) return 0.;
321 return sigma; 323 return sigma;
322 } 324 }
323 325
324 G4double G4ChipsKaonMinusInelasticXS::EquLinea 326 G4double G4ChipsKaonMinusInelasticXS::EquLinearFit(G4double X, G4int N, G4double X0, G4double DX, G4double* Y)
325 { 327 {
326 if(DX<=0. || N<2) 328 if(DX<=0. || N<2)
327 { 329 {
328 G4cerr<<"***G4ChipsKaonMinusInelasticXS: 330 G4cerr<<"***G4ChipsKaonMinusInelasticXS::EquLinearFit: DX="<<DX<<", N="<<N<<G4endl;
329 return Y[0]; 331 return Y[0];
330 } 332 }
331 333
332 G4int N2=N-2; 334 G4int N2=N-2;
333 G4double d=(X-X0)/DX; 335 G4double d=(X-X0)/DX;
334 G4int jj=static_cast<int>(d); 336 G4int jj=static_cast<int>(d);
335 if (jj<0) jj=0; 337 if (jj<0) jj=0;
336 else if(jj>N2) jj=N2; 338 else if(jj>N2) jj=N2;
337 d-=jj; // excess 339 d-=jj; // excess
338 G4double yi=Y[jj]; 340 G4double yi=Y[jj];
339 G4double sigma=yi+(Y[jj+1]-yi)*d; 341 G4double sigma=yi+(Y[jj+1]-yi)*d;
340 342
341 return sigma; 343 return sigma;
342 } 344 }
343 345