Geant4 9.6.0
Toolkit for the simulation of the passage of particles through matter
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G4QKaonPlusNuclearCrossSection.cc
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25//
26//
27// The lust update: M.V. Kossov, CERN/ITEP(Moscow) 17-June-02
28// GEANT4 tag $Name: not supported by cvs2svn $
29//
30//
31// G4 Physics class: G4QKaonPlusNuclearCrossSection 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 kaon(plus)-nuclear interactions
39// -------------------------------------------------------------------------------------
40//
41//#define debug
42//#define pdebug
43//#define debug3
44//#define debugn
45//#define debugs
46
47#include "G4QKaonPlusNuclearCrossSection.hh"
48#include "G4SystemOfUnits.hh"
49
50// Initialization of the
51G4double* G4QKaonPlusNuclearCrossSection::lastLEN=0; // Pointer to the lastArray of LowEn CS
52G4double* G4QKaonPlusNuclearCrossSection::lastHEN=0; // Pointer to the lastArray of HighEn CS
53G4int G4QKaonPlusNuclearCrossSection::lastN=0; // The last N of calculated nucleus
54G4int G4QKaonPlusNuclearCrossSection::lastZ=0; // The last Z of calculated nucleus
55G4double G4QKaonPlusNuclearCrossSection::lastP=0.; // Last used in cross section Momentum
56G4double G4QKaonPlusNuclearCrossSection::lastTH=0.; // Last threshold momentum
57G4double G4QKaonPlusNuclearCrossSection::lastCS=0.; // Last value of the Cross Section
58G4int G4QKaonPlusNuclearCrossSection::lastI=0; // The last position in the DAMDB
59std::vector<G4double*>* G4QKaonPlusNuclearCrossSection::LEN = new std::vector<G4double*>;
60std::vector<G4double*>* G4QKaonPlusNuclearCrossSection::HEN = new std::vector<G4double*>;
61
62// Returns Pointer to the G4VQCrossSection class
63G4VQCrossSection* G4QKaonPlusNuclearCrossSection::GetPointer()
64{
65 static G4QKaonPlusNuclearCrossSection theCrossSection; //**Static body of Cross Section**
66 return &theCrossSection;
67}
68
69G4QKaonPlusNuclearCrossSection::~G4QKaonPlusNuclearCrossSection()
70{
71 G4int lens=LEN->size();
72 for(G4int i=0; i<lens; ++i) delete[] (*LEN)[i];
73 delete LEN;
74 G4int hens=HEN->size();
75 for(G4int i=0; i<hens; ++i) delete[] (*HEN)[i];
76 delete HEN;
77}
78
79// The main member function giving the collision cross section (P is in IU, CS is in mb)
80// Make pMom in independent units ! (Now it is MeV)
81G4double G4QKaonPlusNuclearCrossSection::GetCrossSection(G4bool fCS, G4double pMom,
82 G4int tgZ, G4int tgN, G4int PDG)
83{
84 //A.R.23-Oct-2012 Shadowed variable static G4double tolerance=0.001; // Tolerance (0.1%) to consider as "the same mom"
85 static G4int j; // A#0f Z/N-records already tested in AMDB
86 static std::vector <G4int> colN; // Vector of N for calculated nuclei (isotops)
87 static std::vector <G4int> colZ; // Vector of Z for calculated nuclei (isotops)
88 static std::vector <G4double> colP; // Vector of last momenta for the reaction
89 static std::vector <G4double> colTH; // Vector of energy thresholds for the reaction
90 static std::vector <G4double> colCS; // Vector of last cross sections for the reaction
91 // ***---*** End of the mandatory Static Definitions of the Associative Memory ***---***
92#ifdef debug
93 G4cout<<"G4QKpCS::GetCS:>>> f="<<fCS<<", p="<<pMom<<", Z="<<tgZ<<"("<<lastZ<<") ,N="<<tgN
94 <<"("<<lastN<<"),PDG="<<PDG<<", thresh="<<lastTH<<",Sz="<<colN.size()<<G4endl;
95#endif
96 if(PDG!=321) G4cout<<"-Warning-G4QKaonPlusCS::GetCS:***Not a KPlus***,PDG="<<PDG<<G4endl;
97 G4bool in=false; // By default the isotope must be found in the AMDB
98 if(tgN!=lastN || tgZ!=lastZ) // 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 lastN = tgN; // The last N of the calculated nucleus
103 lastZ = tgZ; // The last Z of the calculated nucleus
104 lastI = colN.size(); // Size of the Associative Memory DB in the heap
105 j = 0; // A#0f records found in DB for this projectile
106#ifdef debug
107 G4cout<<"G4QKpCS::GetCS: the amount of records in the AMDB lastI="<<lastI<<G4endl;
108#endif
109 if(lastI) for(G4int i=0; i<lastI; i++) // AMDB exists, try to find the (Z,N) isotope
110 {
111 if(colN[i]==tgN && colZ[i]==tgZ) // Try the record "i" in the AMDB
112 {
113 lastI=i; // Remember the index for future fast/last use
114 lastTH =colTH[i]; // The last THreshold (A-dependent)
115#ifdef debug
116 G4cout<<"G4QKpCS::GetCS:*Found* P="<<pMom<<",Threshold="<<lastTH<<",j="<<j<<G4endl;
117#endif
118 if(pMom<=lastTH)
119 {
120#ifdef debug
121 G4cout<<"G4QPCS::GetCS:Found,P="<<pMom<<" < Threshold="<<lastTH<<",CS=0"<<G4endl;
122#endif
123 return 0.; // Energy is below the Threshold value
124 }
125 lastP =colP [i]; // Last Momentum (A-dependent)
126 lastCS =colCS[i]; // Last CrossSect (A-dependent)
127 if(std::fabs(lastP-pMom)<tolerance*pMom)
128 //if(lastP==pMom) // VI do not use tolerance
129 {
130#ifdef debug
131 G4cout<<"..G4QKpCS::GetCS:.DoNothing.P="<<pMom<<",CS="<<lastCS*millibarn<<G4endl;
132#endif
133 //CalculateCrossSection(fCS,-1,j,321,lastZ,lastN,pMom); // Update param's only
134 return lastCS*millibarn; // Use theLastCS
135 }
136 in = true; // This is the case when the isotop is found in DB
137 // Momentum pMom is in IU ! @@ Units
138#ifdef debug
139 G4cout<<"G4QKpCS::G:UpdatDB P="<<pMom<<",f="<<fCS<<",lI="<<lastI<<",j="<<j<<G4endl;
140#endif
141 lastCS=CalculateCrossSection(fCS,-1,j,321,lastZ,lastN,pMom); // read & update
142#ifdef debug
143 G4cout<<"G4QKpCS::GetCrosSec: *****> New (inDB) Calculated CS="<<lastCS<<G4endl;
144#endif
145 if(lastCS<=0. && pMom>lastTH) // Correct the threshold (@@ No intermediate Zeros)
146 {
147#ifdef debug
148 G4cout<<"G4QKpCS::GetCS: New P="<<pMom<<"(CS=0) > Threshold="<<lastTH<<G4endl;
149#endif
150 lastCS=0.;
151 lastTH=pMom;
152 }
153 break; // Go out of the LOOP
154 }
155#ifdef debug
156 G4cout<<"-->G4QKpCrossSec::GetCrosSec: pPDG=321, j="<<j<<", N="<<colN[i]
157 <<",Z["<<i<<"]="<<colZ[i]<<G4endl;
158#endif
159 j++; // Increment a#0f records found in DB
160 }
161#ifdef debug
162 G4cout<<"-?-G4QKpCS::GetCS:RC Z="<<tgZ<<",N="<<tgN<<",in="<<in<<",j="<<j<<" ?"<<G4endl;
163#endif
164 if(!in) // This isotope has not been calculated previously
165 {
166#ifdef debug
167 G4cout<<"^^^G4QKpCS::GetCS:CalcNew P="<<pMom<<", f="<<fCS<<", lastI="<<lastI<<G4endl;
168#endif
169 //!!The slave functions must provide cross-sections in millibarns (mb) !! (not in IU)
170 lastCS=CalculateCrossSection(fCS,0,j,321,lastZ,lastN,pMom); //calculate & create
171 //if(lastCS>0.) // It means that the AMBD was initialized
172 //{
173
174 lastTH = ThresholdEnergy(tgZ, tgN); // The Threshold Energy which is now the last
175#ifdef debug
176 G4cout<<"G4QKpCrossSection::GetCrossSect: NewThresh="<<lastTH<<",P="<<pMom<<G4endl;
177#endif
178 colN.push_back(tgN);
179 colZ.push_back(tgZ);
180 colP.push_back(pMom);
181 colTH.push_back(lastTH);
182 colCS.push_back(lastCS);
183#ifdef debug
184 G4cout<<"G4QKpCS::GetCrosSec:recCS="<<lastCS<<",lZ="<<lastN<<",lN="<<lastZ<<G4endl;
185#endif
186 //} // M.K. Presence of H1 with high threshold breaks the syncronization
187#ifdef pdebug
188 G4cout<<"G4QKpCS::GetCS:1st,P="<<pMom<<"(MeV),CS="<<lastCS*millibarn<<"(mb)"<<G4endl;
189#endif
190 return lastCS*millibarn;
191 } // End of creation of the new set of parameters
192 else
193 {
194#ifdef debug
195 G4cout<<"G4QKpCS::GetCS: Update lastI="<<lastI<<",j="<<j<<G4endl;
196#endif
197 colP[lastI]=pMom;
198 colCS[lastI]=lastCS;
199 }
200 } // End of parameters udate
201 else if(pMom<=lastTH)
202 {
203#ifdef debug
204 G4cout<<"G4QKpCS::GetCS: Current P="<<pMom<<" < Threshold="<<lastTH<<", CS=0"<<G4endl;
205#endif
206 return 0.; // Momentum is below the Threshold Value -> CS=0
207 }
208 else if(std::fabs(lastP-pMom)<tolerance*pMom)
209 //else if(lastP==pMom) // VI do not use tolerance
210 {
211#ifdef debug
212 G4cout<<"..G4QPCS::GetCS:OldNZ&P="<<lastP<<"="<<pMom<<",CS="<<lastCS*millibarn<<G4endl;
213#endif
214 return lastCS*millibarn; // Use theLastCS
215 }
216 else // It is the last used -> use the current tables
217 {
218#ifdef debug
219 G4cout<<"-!-G4QPCS::GetCS:UseCur P="<<pMom<<",f="<<fCS<<",I="<<lastI<<",j="<<j<<G4endl;
220#endif
221 lastCS=CalculateCrossSection(fCS,1,j,321,lastZ,lastN,pMom); // Only read and UpdateDB
222 lastP=pMom;
223 }
224#ifdef debug
225 G4cout<<"==>G4QKpCS::GetCroSec: P="<<pMom<<"(MeV),CS="<<lastCS*millibarn<<"(mb)"<<G4endl;
226#endif
227 return lastCS*millibarn;
228}
229
230// The main member function giving the gamma-A cross section (E in GeV, CS in mb)
231G4double G4QKaonPlusNuclearCrossSection::CalculateCrossSection(G4bool, G4int F, G4int I,
232 G4int, G4int targZ, G4int targN, G4double Momentum)
233{
234 static const G4double THmin=27.; // default minimum Momentum (MeV/c) Threshold
235 static const G4double THmiG=THmin*.001; // minimum Momentum (GeV/c) Threshold
236 static const G4double dP=10.; // step for the LEN (Low ENergy) table MeV/c
237 static const G4double dPG=dP*.001; // step for the LEN (Low ENergy) table GeV/c
238 static const G4int nL=105; // A#of LEN points in E (step 10 MeV/c)
239 static const G4double Pmin=THmin+(nL-1)*dP; // minP for the HighE part with safety
240 static const G4double Pmax=227000.; // maxP for the HEN (High ENergy) part 227 GeV
241 static const G4int nH=224; // A#of HEN points in lnE
242 static const G4double milP=std::log(Pmin);// Low logarithm energy for the HEN part
243 static const G4double malP=std::log(Pmax);// High logarithm energy (each 2.75 percent)
244 static const G4double dlP=(malP-milP)/(nH-1); // Step in log energy in the HEN part
245 static const G4double milPG=std::log(.001*Pmin);// Low logarithmEnergy for HEN part GeV/c
246#ifdef debug
247 G4cout<<"G4QKpNucCS::CalCS:N="<<targN<<",Z="<<targZ<<",P="<<Momentum<<">"<<THmin<<G4endl;
248#endif
249 G4double sigma=0.;
250 if(F&&I) sigma=0.; // @@ *!* Fake line *!* to use F & I !!!Temporary!!!
251 G4double A=targN+targZ; // A of the target
252#ifdef debug
253 G4cout<<"G4QKpNucCS::CalCS: A="<<A<<",F="<<F<<",I="<<I<<",nL="<<nL<<",nH="<<nH<<G4endl;
254#endif
255 if(F<=0) // This isotope was not the last used isotop
256 {
257 if(F<0) // This isotope was found in DAMDB =-----=> RETRIEVE
258 {
259 G4int sync=LEN->size();
260 if(sync<=I) G4cerr<<"*!*G4QPiMinusNuclCS::CalcCrosSect:Sync="<<sync<<"<="<<I<<G4endl;
261 lastLEN=(*LEN)[I]; // Pointer to prepared LowEnergy cross sections
262 lastHEN=(*HEN)[I]; // Pointer to prepared High Energy cross sections
263 }
264 else // This isotope wasn't calculated before => CREATE
265 {
266 lastLEN = new G4double[nL]; // Allocate memory for the new LEN cross sections
267 lastHEN = new G4double[nH]; // Allocate memory for the new HEN cross sections
268 // --- Instead of making a separate function ---
269 G4double P=THmiG; // Table threshold in GeV/c
270 for(G4int n=0; n<nL; n++)
271 {
272 lastLEN[n] = CrossSectionLin(targZ, targN, P);
273 P+=dPG;
274 }
275 G4double lP=milPG;
276 for(G4int n=0; n<nH; n++)
277 {
278 lastHEN[n] = CrossSectionLog(targZ, targN, lP);
279 lP+=dlP;
280 }
281#ifdef debug
282 G4cout<<"-*->G4QKpNucCS::CalcCS:Tab for Z="<<targZ<<",N="<<targN<<",I="<<I<<G4endl;
283#endif
284 // --- End of possible separate function
285 // *** The synchronization check ***
286 G4int sync=LEN->size();
287 if(sync!=I)
288 {
289 G4cerr<<"***G4QPiMinusNuclCS::CalcCrossSect: Sinc="<<sync<<"#"<<I<<", Z=" <<targZ
290 <<", N="<<targN<<", F="<<F<<G4endl;
291 //G4Exception("G4PiMinusNuclearCS::CalculateCS:","39",FatalException,"DBoverflow");
292 }
293 LEN->push_back(lastLEN); // remember the Low Energy Table
294 HEN->push_back(lastHEN); // remember the High Energy Table
295 } // End of creation of the new set of parameters
296 } // End of parameters udate
297 // =--------------------------= NOW the Magic Formula =---------------------------------=
298#ifdef debug
299 G4cout<<"G4QKpNCS::CalcCS:lTH="<<lastTH<<",Pmi="<<Pmin<<",dP="<<dP<<",dlP="<<dlP<<G4endl;
300#endif
301 if (Momentum<lastTH) return 0.; // It must be already checked in the interface class
302 else if (Momentum<Pmin) // Low Energy region
303 {
304#ifdef debug
305 G4cout<<"G4QKpNCS::CalcCS:bLEN A="<<A<<", nL="<<nL<<", P="<<Momentum<<G4endl;
306#endif
307 if(A<=1. && Momentum < 600.) sigma=0.; // Approximation tot/el uncertainty
308 else sigma=EquLinearFit(Momentum,nL,THmin,dP,lastLEN);
309#ifdef debugn
310 if(sigma<0.)
311 G4cout<<"G4QKpNuCS::CalcCS: E="<<Momentum<<",T="<<THmin<<",dP="<<dP<<G4endl;
312#endif
313 }
314 else if (Momentum<Pmax) // High Energy region
315 {
316 G4double lP=std::log(Momentum);
317#ifdef debug
318 G4cout<<"G4QKpNucCS::CalcCS: before HEN nH="<<nH<<",iE="<<milP<<",dlP="<<dlP<<G4endl;
319#endif
320 sigma=EquLinearFit(lP,nH,milP,dlP,lastHEN);
321 }
322 else // UHE region (calculation, not frequent)
323 {
324 G4double P=0.001*Momentum; // Approximation formula is for P in GeV/c
325 sigma=CrossSectionFormula(targZ, targN, P, std::log(P));
326 }
327#ifdef debug
328 G4cout<<"G4QKaonPlusNuclearCrossSection::CalcCS: CS="<<sigma<<G4endl;
329#endif
330 if(sigma<0.) return 0.;
331 return sigma;
332}
333
334// Electromagnetic momentum-threshold (in MeV/c)
335G4double G4QKaonPlusNuclearCrossSection::ThresholdMomentum(G4int tZ, G4int tN)
336{
337 static const G4double third=1./3.;
338 static const G4double prM = G4QPDGCode(2212).GetMass(); // Proton mass in MeV
339 static const G4double piM = G4QPDGCode(111).GetMass()+.1; // Pion mass in MeV+Safety
340 static const G4double pM = G4QPDGCode(321).GetMass(); // Projectile mass in MeV
341 static const G4double tpM= pM+pM; // Doubled projectile mass (MeV)
342 G4double tA=tZ+tN;
343 if(tZ<.99 || tN<0.) return 0.;
344 G4double tM=931.5*tA;
345 G4double dE=piM; // At least one Pi0 must be created
346 if(tZ==1 && tN==0) tM=prM; // A threshold on the free proton
347 else dE=tZ/(1.+std::pow(tA,third)); // Safety for diffused edge of the nucleus (QE)
348 //G4double dE=1.263*tZ/(1.+std::pow(tA,third));
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)
354G4double G4QKaonPlusNuclearCrossSection::CrossSectionLin(G4int tZ, G4int tN, 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)
361G4double G4QKaonPlusNuclearCrossSection::CrossSectionLog(G4int tZ, G4int tN, G4double lP)
362{
363 G4double P=std::exp(lP);
364 return CrossSectionFormula(tZ, tN, P, lP);
365}
366// Calculation formula for piMinus-nuclear inelastic cross-section (mb) log(P in GeV/c)
367G4double G4QKaonPlusNuclearCrossSection::CrossSectionFormula(G4int tZ, G4int tN,
368 G4double P, G4double lP)
369{
370 G4double sigma=0.;
371 if(tZ==1 && !tN) // KPlus-Proton interaction from G4QuasiElRatios
372 {
373 G4double ld=lP-3.5;
374 G4double ld2=ld*ld;
375 G4double sp=std::sqrt(P);
376 G4double p2=P*P;
377 G4double p4=p2*p2;
378 G4double lm=P-1.;
379 G4double md=lm*lm+.372;
380 G4double El=(.0557*ld2+2.23)/(1.-.7/sp+.1/p4);
381 G4double To=(.3*ld2+19.5)/(1.+.46/sp+1.6/p4);
382 sigma=(To-El)+.6/md;
383 }
384 else if(tZ<97 && tN<152) // General solution
385 {
386 G4double p2=P*P;
387 G4double p4=p2*p2;
388 G4double a=tN+tZ; // A of the target
389 G4double al=std::log(a);
390 G4double sa=std::sqrt(a);
391 G4double asa=a*sa;
392 G4double a2=a*a;
393 G4double a3=a2*a;
394 G4double a4=a2*a2;
395 G4double a8=a4*a4;
396 G4double a12=a8*a4;
397 G4double f=.6; // Default values for deutrons
398 G4double r=.5;
399 G4double g_value=3.7;
400 G4double c=36.;
401 G4double s_value=3.5;
402 G4double t=3.;
403 G4double u=.44;
404 G4double v=5.E-9;
405 if(tZ>1 && tN>1) // More than deuteron
406 {
407 f=1.;
408 r=1./(1.+.007*a2);
409 g_value=4.2;
410 c=52.*std::exp(al*.6)*(1.+95./a2)/(1.+9./a)/(1.+46./a2);
411 s_value=(40.+.14*a)/(1.+12./a);
412 G4double y=std::exp(al*1.7);
413 t=.185*y/(1.+.00012*y);
414 u=(1.+80./asa)/(1.+200./asa);
415 v=(1.+3.E-6*a4*(1.+6.E-7*a3+4.E10/a12))/a3/20000.;
416 }
417 G4double d=lP-g_value;
418 G4double w=P-1.;
419 G4double rD=s_value/(w*w+.36);
420 G4double h=P-.44;
421 G4double rR=t/(h*h+u*u);
422 sigma=(f*d*d+c)/(1.+r/std::sqrt(P)+1./p4)+(rD+rR)/(1+v/p4/p4);
423#ifdef pdebug
424 G4cout<<"G4QKaonPlusNucCS::CSForm: A="<<a<<",P="<<P<<",CS="<<sigma<<",c="<<c<<",g="<<g_value
425 <<",d="<<d<<",r="<<r<<",h="<<h<<G4endl;
426#endif
427 }
428 else
429 {
430 G4cerr<<"-Warning-G4QKaonPlusNuclearCroSect::CSForm:Bad A, Z="<<tZ<<", N="<<tN<<G4endl;
431 sigma=0.;
432 }
433 if(sigma<0.) return 0.;
434 return sigma;
435}
G4double
double G4double
Definition: G4Types.hh:64
G4int
int G4int
Definition: G4Types.hh:66
G4bool
bool G4bool
Definition: G4Types.hh:67
G4endl
#define G4endl
Definition: G4ios.hh:52
G4cerr
G4DLLIMPORT std::ostream G4cerr
G4cout
G4DLLIMPORT std::ostream G4cout
G4QKaonPlusNuclearCrossSection::GetCrossSection
virtual G4double GetCrossSection(G4bool fCS, G4double pMom, G4int tgZ, G4int tgN, G4int pPDG=321)
Definition: G4QKaonPlusNuclearCrossSection.cc:81
G4QKaonPlusNuclearCrossSection::CalculateCrossSection
G4double CalculateCrossSection(G4bool CS, G4int F, G4int I, G4int PDG, G4int Z, G4int N, G4double Momentum)
Definition: G4QKaonPlusNuclearCrossSection.cc:231
G4QPDGCode::GetMass
G4double GetMass()
Definition: G4QPDGCode.cc:693
G4VQCrossSection::EquLinearFit
G4double EquLinearFit(G4double X, G4int N, G4double X0, G4double DX, G4double *Y)
Definition: G4VQCrossSection.cc:94
G4VQCrossSection::ThresholdEnergy
virtual G4double ThresholdEnergy(G4int Z, G4int N, G4int PDG=0)
Definition: G4VQCrossSection.cc:54
G4VQCrossSection::tolerance
static G4double tolerance
Definition: G4VQCrossSection.hh:175