source: trunk/source/processes/hadronic/models/high_energy/src/G4HEKaonZeroLongInelastic.cc@ 1317

Last change on this file since 1317 was 1315, checked in by garnier, 15 years ago

update geant4-09-04-beta-cand-01 interfaces-V09-03-09 vis-V09-03-08
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1//
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4// * *
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17// * *
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19// * technical work of the GEANT4 collaboration. *
20// * By using, copying, modifying or distributing the software (or *
21// * any work based on the software) you agree to acknowledge its *
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24// ********************************************************************
25//
26// $Id: G4HEKaonZeroLongInelastic.cc,v 1.11 2010/02/09 21:59:10 dennis Exp $
27// GEANT4 tag $Name: geant4-09-04-beta-cand-01 $
28//
29//
30
31#include "globals.hh"
32#include "G4ios.hh"
33
34//
35// G4 Process: Gheisha High Energy Collision model.
36// This includes the high energy cascading model, the two-body-resonance model
37// and the low energy two-body model. Not included are the low energy stuff like
38// nuclear reactions, nuclear fission without any cascading and all processes for
39// particles at rest.
40//
41// New version by D.H. Wright (SLAC) to fix seg fault in old version
42// 26 January 2010
43
44
45#include "G4HEKaonZeroLongInelastic.hh"
46
47G4HadFinalState* G4HEKaonZeroLongInelastic::
48ApplyYourself(const G4HadProjectile &aTrack, G4Nucleus &targetNucleus)
49{
50 G4HEVector * pv = new G4HEVector[MAXPART];
51 const G4HadProjectile *aParticle = &aTrack;
52 const G4double atomicWeight = targetNucleus.GetN();
53 const G4double atomicNumber = targetNucleus.GetZ();
54 G4HEVector incidentParticle(aParticle);
55
56 G4int incidentCode = incidentParticle.getCode();
57 G4double incidentMass = incidentParticle.getMass();
58 G4double incidentTotalEnergy = incidentParticle.getEnergy();
59 G4double incidentTotalMomentum = incidentParticle.getTotalMomentum();
60 G4double incidentKineticEnergy = incidentTotalEnergy - incidentMass;
61
62 if(incidentKineticEnergy < 1)
63 G4cout << "GHEKaonZeroLongInelastic: incident energy < 1 GeV " << G4endl;
64
65 if(verboseLevel > 1) {
66 G4cout << "G4HEKaonZeroLongInelastic::ApplyYourself" << G4endl;
67 G4cout << "incident particle " << incidentParticle.getName()
68 << "mass " << incidentMass
69 << "kinetic energy " << incidentKineticEnergy
70 << G4endl;
71 G4cout << "target material with (A,Z) = ("
72 << atomicWeight << "," << atomicNumber << ")" << G4endl;
73 }
74
75 G4double inelasticity = NuclearInelasticity(incidentKineticEnergy,
76 atomicWeight, atomicNumber);
77 if(verboseLevel > 1)
78 G4cout << "nuclear inelasticity = " << inelasticity << G4endl;
79
80 incidentKineticEnergy -= inelasticity;
81
82 G4double excitationEnergyGNP = 0.;
83 G4double excitationEnergyDTA = 0.;
84
85 G4double excitation = NuclearExcitation(incidentKineticEnergy,
86 atomicWeight, atomicNumber,
87 excitationEnergyGNP,
88 excitationEnergyDTA);
89 if(verboseLevel > 1)
90 G4cout << "nuclear excitation = " << excitation << excitationEnergyGNP
91 << excitationEnergyDTA << G4endl;
92
93 incidentKineticEnergy -= excitation;
94 incidentTotalEnergy = incidentKineticEnergy + incidentMass;
95 incidentTotalMomentum = std::sqrt( (incidentTotalEnergy-incidentMass)
96 *(incidentTotalEnergy+incidentMass));
97
98
99 G4HEVector targetParticle;
100 if(G4UniformRand() < atomicNumber/atomicWeight) {
101 targetParticle.setDefinition("Proton");
102 } else {
103 targetParticle.setDefinition("Neutron");
104 }
105
106 G4double targetMass = targetParticle.getMass();
107 G4double centerOfMassEnergy = std::sqrt( incidentMass*incidentMass + targetMass*targetMass
108 + 2.0*targetMass*incidentTotalEnergy);
109 G4double availableEnergy = centerOfMassEnergy - targetMass - incidentMass;
110 // this was the meaning of inElastic in the
111 // original Gheisha stand-alone version.
112// G4bool inElastic = InElasticCrossSectionInFirstInt
113// (availableEnergy, incidentCode, incidentTotalMomentum);
114// for unknown reasons, it has been replaced by the following code in Geant???
115
116 G4bool inElastic = true;
117// if (G4UniformRand() < elasticCrossSection/totalCrossSection) inElastic = false;
118
119 vecLength = 0;
120
121 if(verboseLevel > 1)
122 G4cout << "ApplyYourself: CallFirstIntInCascade for particle "
123 << incidentCode << G4endl;
124
125 G4bool successful = false;
126
127 if(inElastic || (!inElastic && atomicWeight < 1.5)) {
128
129 // Split K0L into K0 and K0bar
130 if (G4UniformRand() < 0.5)
131 FirstIntInCasAntiKaonZero(inElastic, availableEnergy, pv, vecLength,
132 incidentParticle, targetParticle );
133 else
134 FirstIntInCasKaonZero(inElastic, availableEnergy, pv, vecLength,
135 incidentParticle, targetParticle, atomicWeight );
136
137 // Do nuclear interaction with either K0 or K0bar
138 if ((vecLength > 0) && (availableEnergy > 1.))
139 StrangeParticlePairProduction(availableEnergy, centerOfMassEnergy,
140 pv, vecLength,
141 incidentParticle, targetParticle);
142 HighEnergyCascading(successful, pv, vecLength,
143 excitationEnergyGNP, excitationEnergyDTA,
144 incidentParticle, targetParticle,
145 atomicWeight, atomicNumber);
146 if (!successful)
147 HighEnergyClusterProduction(successful, pv, vecLength,
148 excitationEnergyGNP, excitationEnergyDTA,
149 incidentParticle, targetParticle,
150 atomicWeight, atomicNumber);
151 if (!successful)
152 MediumEnergyCascading(successful, pv, vecLength,
153 excitationEnergyGNP, excitationEnergyDTA,
154 incidentParticle, targetParticle,
155 atomicWeight, atomicNumber);
156
157 if (!successful)
158 MediumEnergyClusterProduction(successful, pv, vecLength,
159 excitationEnergyGNP, excitationEnergyDTA,
160 incidentParticle, targetParticle,
161 atomicWeight, atomicNumber);
162 if (!successful)
163 QuasiElasticScattering(successful, pv, vecLength,
164 excitationEnergyGNP, excitationEnergyDTA,
165 incidentParticle, targetParticle,
166 atomicWeight, atomicNumber);
167 }
168
169 if (!successful)
170 ElasticScattering(successful, pv, vecLength,
171 incidentParticle,
172 atomicWeight, atomicNumber);
173
174 if (!successful)
175 G4cout << "GHEInelasticInteraction::ApplyYourself fails to produce final state particles"
176 << G4endl;
177
178 // Check for K0, K0bar and change particle types to K0L, K0S if necessary
179 G4int kcode;
180 for (G4int i = 0; i < vecLength; i++) {
181 kcode = pv[i].getCode();
182 if (kcode == KaonZero.getCode() || kcode == AntiKaonZero.getCode()) {
183 if (G4UniformRand() < 0.5)
184 pv[i] = KaonZeroShort;
185 else
186 pv[i] = KaonZeroLong;
187 }
188 }
189
190 // ................
191
192 FillParticleChange(pv, vecLength);
193 delete [] pv;
194 theParticleChange.SetStatusChange(stopAndKill);
195 return & theParticleChange;
196}
197
198
199void
200G4HEKaonZeroLongInelastic::FirstIntInCasKaonZero(G4bool &inElastic,
201 const G4double availableEnergy,
202 G4HEVector pv[],
203 G4int &vecLen,
204 G4HEVector incidentParticle,
205 G4HEVector targetParticle,
206 const G4double atomicWeight)
207
208// Kaon0 undergoes interaction with nucleon within a nucleus. Check if it is
209// energetically possible to produce pions/kaons. In not, assume nuclear excitation
210// occurs and input particle is degraded in energy. No other particles are produced.
211// If reaction is possible, find the correct number of pions/protons/neutrons
212// produced using an interpolation to multiplicity data. Replace some pions or
213// protons/neutrons by kaons or strange baryons according to the average
214// multiplicity per inelastic reaction.
215
216{
217 static const G4double expxu = std::log(MAXFLOAT); // upper bound for arg. of exp
218 static const G4double expxl = -expxu; // lower bound for arg. of exp
219
220 static const G4double protb = 0.7;
221 static const G4double neutb = 0.7;
222 static const G4double c = 1.25;
223
224 static const G4int numMul = 1200;
225 static const G4int numSec = 60;
226
227 G4int neutronCode = Neutron.getCode();
228 G4int protonCode = Proton.getCode();
229
230 G4int targetCode = targetParticle.getCode();
231 G4double incidentTotalMomentum = incidentParticle.getTotalMomentum();
232
233 static G4bool first = true;
234 static G4double protmul[numMul], protnorm[numSec]; // proton constants
235 static G4double neutmul[numMul], neutnorm[numSec]; // neutron constants
236
237 // misc. local variables
238 // np = number of pi+, nm = number of pi-, nz = number of pi0
239
240 G4int i, counter, nt, np, nm, nz;
241
242 if (first) {
243 // compute normalization constants, this will only be done once
244 first = false;
245 for( i=0; i<numMul; i++ )protmul[i] = 0.0;
246 for( i=0; i<numSec; i++ )protnorm[i] = 0.0;
247 counter = -1;
248 for (np=0; np<(numSec/3); np++) {
249 for (nm=std::max(0,np-1); nm<=(np+1); nm++) {
250 for (nz=0; nz<numSec/3; nz++) {
251 if (++counter < numMul) {
252 nt = np+nm+nz;
253 if( (nt>0) && (nt<=numSec) ) {
254 protmul[counter] = pmltpc(np,nm,nz,nt,protb,c) ;
255 protnorm[nt-1] += protmul[counter];
256 }
257 }
258 }
259 }
260 }
261
262 for( i=0; i<numMul; i++ )neutmul[i] = 0.0;
263 for( i=0; i<numSec; i++ )neutnorm[i] = 0.0;
264 counter = -1;
265 for (np=0; np<numSec/3; np++) {
266 for (nm=np; nm<=(np+2); nm++) {
267 for (nz=0; nz<numSec/3; nz++) {
268 if (++counter < numMul) {
269 nt = np+nm+nz;
270 if( (nt>0) && (nt<=numSec) ) {
271 neutmul[counter] = pmltpc(np,nm,nz,nt,neutb,c);
272 neutnorm[nt-1] += neutmul[counter];
273 }
274 }
275 }
276 }
277 }
278
279 for (i=0; i<numSec; i++) {
280 if( protnorm[i] > 0.0 )protnorm[i] = 1.0/protnorm[i];
281 if( neutnorm[i] > 0.0 )neutnorm[i] = 1.0/neutnorm[i];
282 }
283 } // end of initialization
284
285
286 // Initialize the first two particles
287 // the same as beam and target
288 pv[0] = incidentParticle;
289 pv[1] = targetParticle;
290 vecLen = 2;
291
292 if( !inElastic ) {
293 // quasi-elastic scattering, no pions produced
294 if( targetCode == protonCode) {
295 G4double cech[] = {0.33,0.27,0.29,0.31,0.27,0.18,0.13,0.10,0.09,0.07};
296 G4int iplab = G4int( std::min( 9.0, incidentTotalMomentum*5. ) );
297 if( G4UniformRand() < cech[iplab]/std::pow(atomicWeight,0.42)) {
298 // charge exchange K+ n -> K0 p
299 pv[0] = KaonPlus;
300 pv[1] = Neutron;
301 }
302 }
303 return;
304 } else if (availableEnergy <= PionPlus.getMass()) {
305 return;
306 }
307
308 // Inelastic scattering
309
310 np = 0, nm = 0, nz = 0;
311 G4double eab = availableEnergy;
312 G4int ieab = G4int( eab*5.0 );
313
314 G4double supp[] = {0., 0.4, 0.55, 0.65, 0.75, 0.82, 0.86, 0.90, 0.94, 0.98};
315 if( (ieab <= 9) && (G4UniformRand() >= supp[ieab])) {
316 // Suppress high multiplicity events at low momentum
317 // only one additional pion will be produced
318 G4double w0, wp, wm, wt, ran;
319 if (targetCode == neutronCode) {
320 // target is a neutron
321 w0 = - sqr(1.+protb)/(2.*c*c);
322 w0 = std::exp(w0);
323 wm = - sqr(-1.+protb)/(2.*c*c);
324 wm = std::exp(wm);
325 w0 = w0/2.;
326 wm = wm*1.5;
327 if (G4UniformRand() < w0/(w0+wm) ) {
328 np = 0;
329 nm = 0;
330 nz = 1;
331 } else {
332 np = 0;
333 nm = 1;
334 nz = 0;
335 }
336
337 } else {
338 // target is a proton
339 w0 = -sqr(1.+neutb)/(2.*c*c);
340 wp = w0 = std::exp(w0);
341 wm = -sqr(-1.+neutb)/(2.*c*c);
342 wm = std::exp(wm);
343 wt = w0+wp+wm;
344 wp = w0+wp;
345 ran = G4UniformRand();
346 if ( ran < w0/wt) {
347 np = 0;
348 nm = 0;
349 nz = 1;
350 } else if (ran < wp/wt) {
351 np = 1;
352 nm = 0;
353 nz = 0;
354 } else {
355 np = 0;
356 nm = 1;
357 nz = 0;
358 }
359 }
360 } else {
361 // number of total particles vs. centre of mass Energy - 2*proton mass
362
363 G4double aleab = std::log(availableEnergy);
364 G4double n = 3.62567+aleab*(0.665843+aleab*(0.336514
365 + aleab*(0.117712+0.0136912*aleab))) - 2.0;
366
367 // Normalization constant for kno-distribution.
368 // Calculate first the sum of all constants, check for numerical problems.
369 G4double test, dum, anpn = 0.0;
370
371 for (nt=1; nt<=numSec; nt++) {
372 test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) );
373 dum = pi*nt/(2.0*n*n);
374 if (std::fabs(dum) < 1.0) {
375 if( test >= 1.0e-10 )anpn += dum*test;
376 } else {
377 anpn += dum*test;
378 }
379 }
380
381 G4double ran = G4UniformRand();
382 G4double excs = 0.0;
383 if( targetCode == protonCode )
384 {
385 counter = -1;
386 for( np=0; np<numSec/3; np++ )
387 {
388 for( nm=std::max(0,np-1); nm<=(np+1); nm++ )
389 {
390 for (nz=0; nz<numSec/3; nz++) {
391 if (++counter < numMul) {
392 nt = np+nm+nz;
393 if ( (nt>0) && (nt<=numSec) ) {
394 test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) );
395 dum = (pi/anpn)*nt*protmul[counter]*protnorm[nt-1]/(2.0*n*n);
396 if (std::fabs(dum) < 1.0) {
397 if( test >= 1.0e-10 )excs += dum*test;
398 } else {
399 excs += dum*test;
400 }
401 if (ran < excs) goto outOfLoop; //----------------------->
402 }
403 }
404 }
405 }
406 }
407
408 // 3 previous loops continued to the end
409 inElastic = false; // quasi-elastic scattering
410 return;
411 }
412 else
413 { // target must be a neutron
414 counter = -1;
415 for( np=0; np<numSec/3; np++ )
416 {
417 for( nm=np; nm<=(np+2); nm++ )
418 {
419 for (nz=0; nz<numSec/3; nz++) {
420 if (++counter < numMul) {
421 nt = np+nm+nz;
422 if ( (nt>=1) && (nt<=numSec) ) {
423 test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) );
424 dum = (pi/anpn)*nt*neutmul[counter]*neutnorm[nt-1]/(2.0*n*n);
425 if (std::fabs(dum) < 1.0) {
426 if( test >= 1.0e-10 )excs += dum*test;
427 } else {
428 excs += dum*test;
429 }
430 if (ran < excs) goto outOfLoop; // -------------------------->
431 }
432 }
433 }
434 }
435 }
436 // 3 previous loops continued to the end
437 inElastic = false; // quasi-elastic scattering.
438 return;
439 }
440 }
441 outOfLoop: // <-----------------------------------------------
442
443 if( targetCode == neutronCode)
444 {
445 if( np == nm)
446 {
447 }
448 else if (np == (nm-1))
449 {
450 if( G4UniformRand() < 0.5)
451 {
452 pv[0] = KaonPlus;
453 }
454 else
455 {
456 pv[1] = Proton;
457 }
458 }
459 else
460 {
461 pv[0] = KaonPlus;
462 pv[1] = Proton;
463 }
464 }
465 else
466 {
467 if( np == nm )
468 {
469 if( G4UniformRand() < 0.25)
470 {
471 pv[0] = KaonPlus;
472 pv[1] = Neutron;
473 }
474 else
475 {
476 }
477 }
478 else if ( np == (nm+1))
479 {
480 pv[1] = Neutron;
481 }
482 else
483 {
484 pv[0] = KaonPlus;
485 }
486 }
487
488 nt = np + nm + nz;
489 while (nt > 0) {
490 G4double ran = G4UniformRand();
491 if (ran < (G4double)np/nt) {
492 if (np > 0) {
493 pv[vecLen++] = PionPlus;
494 np--;
495 }
496 } else if ( ran < (G4double)(np+nm)/nt) {
497 if (nm > 0) {
498 pv[vecLen++] = PionMinus;
499 nm--;
500 }
501 } else {
502 if (nz > 0) {
503 pv[vecLen++] = PionZero;
504 nz--;
505 }
506 }
507 nt = np + nm + nz;
508 }
509
510 if (verboseLevel > 1) {
511 G4cout << "Particles produced: " ;
512 G4cout << pv[0].getName() << " " ;
513 G4cout << pv[1].getName() << " " ;
514 for (i=2; i < vecLen; i++) G4cout << pv[i].getName() << " " ;
515 G4cout << G4endl;
516 }
517
518 return;
519}
520
521
522void
523G4HEKaonZeroLongInelastic::FirstIntInCasAntiKaonZero(G4bool &inElastic,
524 const G4double availableEnergy,
525 G4HEVector pv[],
526 G4int &vecLen,
527 G4HEVector incidentParticle,
528 G4HEVector targetParticle )
529
530// AntiKaon0 undergoes interaction with nucleon within a nucleus. Check if it is
531// energetically possible to produce pions/kaons. In not, assume nuclear excitation
532// occurs and input particle is degraded in energy. No other particles are produced.
533// If reaction is possible, find the correct number of pions/protons/neutrons
534// produced using an interpolation to multiplicity data. Replace some pions or
535// protons/neutrons by kaons or strange baryons according to the average
536// multiplicity per inelastic reaction.
537
538{
539 static const G4double expxu = std::log(MAXFLOAT); // upper bound for arg. of exp
540 static const G4double expxl = -expxu; // lower bound for arg. of exp
541
542 static const G4double protb = 0.7;
543 static const G4double neutb = 0.7;
544 static const G4double c = 1.25;
545
546 static const G4int numMul = 1200;
547 static const G4int numSec = 60;
548
549 G4int neutronCode = Neutron.getCode();
550 G4int protonCode = Proton.getCode();
551 G4int kaonMinusCode = KaonMinus.getCode();
552 G4int kaonZeroCode = KaonZero.getCode();
553 G4int antiKaonZeroCode = AntiKaonZero.getCode();
554
555 G4int targetCode = targetParticle.getCode();
556 G4double incidentTotalMomentum = incidentParticle.getTotalMomentum();
557
558 static G4bool first = true;
559 static G4double protmul[numMul], protnorm[numSec]; // proton constants
560 static G4double neutmul[numMul], neutnorm[numSec]; // neutron constants
561
562// misc. local variables
563// np = number of pi+, nm = number of pi-, nz = number of pi0
564
565 G4int i, counter, nt, np, nm, nz;
566
567 if(first) {
568 // compute normalization constants, this will only be done once
569 first = false;
570 for( i=0; i<numMul; i++ )protmul[i] = 0.0;
571 for( i=0; i<numSec; i++ )protnorm[i] = 0.0;
572 counter = -1;
573 for(np=0; np<(numSec/3); np++) {
574 for(nm=std::max(0,np-2); nm<=np; nm++) {
575 for(nz=0; nz<numSec/3; nz++) {
576 if(++counter < numMul) {
577 nt = np+nm+nz;
578 if( (nt>0) && (nt<=numSec) ) {
579 protmul[counter] = pmltpc(np,nm,nz,nt,protb,c) ;
580 protnorm[nt-1] += protmul[counter];
581 }
582 }
583 }
584 }
585 }
586
587 for( i=0; i<numMul; i++ )neutmul[i] = 0.0;
588 for( i=0; i<numSec; i++ )neutnorm[i] = 0.0;
589 counter = -1;
590 for(np=0; np<numSec/3; np++) {
591 for(nm=std::max(0,np-1); nm<=(np+1); nm++) {
592 for(nz=0; nz<numSec/3; nz++) {
593 if(++counter < numMul) {
594 nt = np+nm+nz;
595 if( (nt>0) && (nt<=numSec) ) {
596 neutmul[counter] = pmltpc(np,nm,nz,nt,neutb,c);
597 neutnorm[nt-1] += neutmul[counter];
598 }
599 }
600 }
601 }
602 }
603
604 for(i=0; i<numSec; i++) {
605 if( protnorm[i] > 0.0 )protnorm[i] = 1.0/protnorm[i];
606 if( neutnorm[i] > 0.0 )neutnorm[i] = 1.0/neutnorm[i];
607 }
608 } // end of initialization
609
610 // initialize the first two particles
611 // the same as beam and target
612 pv[0] = incidentParticle;
613 pv[1] = targetParticle;
614 vecLen = 2;
615
616 if (!inElastic || (availableEnergy <= PionPlus.getMass()))
617 return;
618
619 // Inelastic scattering
620
621 np = 0, nm = 0, nz = 0;
622 G4double cech[] = { 1., 1., 1., 0.70, 0.60, 0.55, 0.35, 0.25, 0.18, 0.15};
623 G4int iplab = G4int( incidentTotalMomentum*5.);
624 if( (iplab < 10) && (G4UniformRand() < cech[iplab]) ) {
625 G4int iplab = std::min(19, G4int( incidentTotalMomentum*5.));
626 G4double cnk0[] = {0.17, 0.18, 0.17, 0.24, 0.26, 0.20, 0.22, 0.21, 0.34, 0.45,
627 0.58, 0.55, 0.36, 0.29, 0.29, 0.32, 0.32, 0.33, 0.33, 0.33};
628 if(G4UniformRand() < cnk0[iplab]) {
629 if(targetCode == protonCode) {
630 return;
631 } else {
632 pv[0] = KaonMinus;
633 pv[1] = Proton;
634 return;
635 }
636 }
637
638 G4double ran = G4UniformRand();
639 if(targetCode == protonCode) {
640
641 // target is a proton
642 if( ran < 0.25 ) {
643 ;
644 } else if (ran < 0.50) {
645 pv[0] = PionPlus;
646 pv[1] = SigmaZero;
647 } else if (ran < 0.75) {
648 ;
649 } else {
650 pv[0] = PionPlus;
651 pv[1] = Lambda;
652 }
653 } else {
654
655 // target is a neutron
656 if( ran < 0.25 ) {
657 pv[0] = PionMinus;
658 pv[1] = SigmaPlus;
659 } else if (ran < 0.50) {
660 pv[0] = PionZero;
661 pv[1] = SigmaZero;
662 } else if (ran < 0.75) {
663 pv[0] = PionPlus;
664 pv[1] = SigmaMinus;
665 } else {
666 pv[0] = PionZero;
667 pv[1] = Lambda;
668 }
669 }
670 return;
671
672 } else {
673 // number of total particles vs. centre of mass Energy - 2*proton mass
674
675 G4double aleab = std::log(availableEnergy);
676 G4double n = 3.62567+aleab*(0.665843+aleab*(0.336514
677 + aleab*(0.117712+0.0136912*aleab))) - 2.0;
678
679 // Normalization constant for kno-distribution.
680 // Calculate first the sum of all constants, check for numerical problems.
681 G4double test, dum, anpn = 0.0;
682
683 for (nt=1; nt<=numSec; nt++) {
684 test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) );
685 dum = pi*nt/(2.0*n*n);
686 if (std::fabs(dum) < 1.0) {
687 if( test >= 1.0e-10 )anpn += dum*test;
688 } else {
689 anpn += dum*test;
690 }
691 }
692
693 G4double ran = G4UniformRand();
694 G4double excs = 0.0;
695 if (targetCode == protonCode) {
696 counter = -1;
697 for (np=0; np<numSec/3; np++) {
698 for (nm=std::max(0,np-2); nm<=np; nm++) {
699 for (nz=0; nz<numSec/3; nz++) {
700 if (++counter < numMul) {
701 nt = np+nm+nz;
702 if( (nt>0) && (nt<=numSec) ) {
703 test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) );
704 dum = (pi/anpn)*nt*protmul[counter]*protnorm[nt-1]/(2.0*n*n);
705
706 if (std::fabs(dum) < 1.0) {
707 if( test >= 1.0e-10 )excs += dum*test;
708 } else {
709 excs += dum*test;
710 }
711
712 if (ran < excs) goto outOfLoop; //----------------------->
713 }
714 }
715 }
716 }
717 }
718 // 3 previous loops continued to the end
719 inElastic = false; // quasi-elastic scattering
720 return;
721
722 } else { // target must be a neutron
723 counter = -1;
724 for (np=0; np<numSec/3; np++) {
725 for (nm=std::max(0,np-1); nm<=(np+1); nm++) {
726 for (nz=0; nz<numSec/3; nz++) {
727 if (++counter < numMul) {
728 nt = np+nm+nz;
729 if( (nt>=1) && (nt<=numSec) ) {
730 test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) );
731 dum = (pi/anpn)*nt*neutmul[counter]*neutnorm[nt-1]/(2.0*n*n);
732
733 if (std::fabs(dum) < 1.0) {
734 if( test >= 1.0e-10 )excs += dum*test;
735 } else {
736 excs += dum*test;
737 }
738
739 if (ran < excs) goto outOfLoop; // -------------------------->
740 }
741 }
742 }
743 }
744 }
745 // 3 previous loops continued to the end
746 inElastic = false; // quasi-elastic scattering.
747 return;
748 }
749 }
750 outOfLoop: // <------------------------------------------------------------------------
751
752 if( targetCode == protonCode)
753 {
754 if( np == nm)
755 {
756 }
757 else if (np == (1+nm))
758 {
759 if( G4UniformRand() < 0.5)
760 {
761 pv[0] = KaonMinus;
762 }
763 else
764 {
765 pv[1] = Neutron;
766 }
767 }
768 else
769 {
770 pv[0] = KaonMinus;
771 pv[1] = Neutron;
772 }
773 }
774 else
775 {
776 if( np == nm)
777 {
778 if( G4UniformRand() < 0.75)
779 {
780 }
781 else
782 {
783 pv[0] = KaonMinus;
784 pv[1] = Proton;
785 }
786 }
787 else if ( np == (1+nm))
788 {
789 pv[0] = KaonMinus;
790 }
791 else
792 {
793 pv[1] = Proton;
794 }
795 }
796
797
798 if( G4UniformRand() < 0.5 )
799 {
800 if( ( (pv[0].getCode() == kaonMinusCode)
801 && (pv[1].getCode() == neutronCode) )
802 || ( (pv[0].getCode() == kaonZeroCode)
803 && (pv[1].getCode() == protonCode) )
804 || ( (pv[0].getCode() == antiKaonZeroCode)
805 && (pv[1].getCode() == protonCode) ) )
806 {
807 G4double ran = G4UniformRand();
808 if( pv[1].getCode() == protonCode)
809 {
810 if(ran < 0.68)
811 {
812 pv[0] = PionPlus;
813 pv[1] = Lambda;
814 }
815 else if (ran < 0.84)
816 {
817 pv[0] = PionZero;
818 pv[1] = SigmaPlus;
819 }
820 else
821 {
822 pv[0] = PionPlus;
823 pv[1] = SigmaZero;
824 }
825 }
826 else
827 {
828 if(ran < 0.68)
829 {
830 pv[0] = PionMinus;
831 pv[1] = Lambda;
832 }
833 else if (ran < 0.84)
834 {
835 pv[0] = PionMinus;
836 pv[1] = SigmaZero;
837 }
838 else
839 {
840 pv[0] = PionZero;
841 pv[1] = SigmaMinus;
842 }
843 }
844 }
845 else
846 {
847 G4double ran = G4UniformRand();
848 if (ran < 0.67)
849 {
850 pv[0] = PionZero;
851 pv[1] = Lambda;
852 }
853 else if (ran < 0.78)
854 {
855 pv[0] = PionMinus;
856 pv[1] = SigmaPlus;
857 }
858 else if (ran < 0.89)
859 {
860 pv[0] = PionZero;
861 pv[1] = SigmaZero;
862 }
863 else
864 {
865 pv[0] = PionPlus;
866 pv[1] = SigmaMinus;
867 }
868 }
869 }
870
871 nt = np + nm + nz;
872 while ( nt > 0) {
873 G4double ran = G4UniformRand();
874 if ( ran < (G4double)np/nt) {
875 if( np > 0 ) {
876 pv[vecLen++] = PionPlus;
877 np--;
878 }
879 } else if (ran < (G4double)(np+nm)/nt) {
880 if( nm > 0 ) {
881 pv[vecLen++] = PionMinus;
882 nm--;
883 }
884 } else {
885 if( nz > 0 ) {
886 pv[vecLen++] = PionZero;
887 nz--;
888 }
889 }
890 nt = np + nm + nz;
891 }
892
893 if (verboseLevel > 1) {
894 G4cout << "Particles produced: " ;
895 G4cout << pv[0].getName() << " " ;
896 G4cout << pv[1].getName() << " " ;
897 for (i=2; i < vecLen; i++) G4cout << pv[i].getName() << " " ;
898 G4cout << G4endl;
899 }
900
901 return;
902}
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