source: trunk/source/processes/hadronic/models/high_energy/src/G4HEKaonZeroInelastic.cc@ 1330

Last change on this file since 1330 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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25//
26//
27// $Id: G4HEKaonZeroInelastic.cc,v 1.16 2010/02/09 22:02:20 dennis Exp $
28// GEANT4 tag $Name: geant4-09-04-beta-cand-01 $
29//
30//
31
32#include "globals.hh"
33#include "G4ios.hh"
34
35//
36// G4 Process: Gheisha High Energy Collision model.
37// This includes the high energy cascading model, the two-body-resonance model
38// and the low energy two-body model. Not included are the low energy stuff like
39// nuclear reactions, nuclear fission without any cascading and all processes for
40// particles at rest.
41// First work done by J.L.Chuma and F.W.Jones, TRIUMF, June 96.
42// H. Fesefeldt, RWTH-Aachen, 23-October-1996
43// Last modified: 29-July-1998
44
45#include "G4HEKaonZeroInelastic.hh"
46
47G4HadFinalState * G4HEKaonZeroInelastic::
48ApplyYourself( const G4HadProjectile &aTrack, G4Nucleus &targetNucleus )
49 {
50 G4HEVector * pv = new G4HEVector[MAXPART];
51 const G4HadProjectile *aParticle = &aTrack;
52// G4DynamicParticle *originalTarget = targetNucleus.ReturnTargetParticle();
53 const G4double A = targetNucleus.GetN();
54 const G4double Z = targetNucleus.GetZ();
55 G4HEVector incidentParticle(aParticle);
56
57 G4double atomicNumber = Z;
58 G4double atomicWeight = A;
59
60 G4int incidentCode = incidentParticle.getCode();
61 G4double incidentMass = incidentParticle.getMass();
62 G4double incidentTotalEnergy = incidentParticle.getEnergy();
63 G4double incidentTotalMomentum = incidentParticle.getTotalMomentum();
64 G4double incidentKineticEnergy = incidentTotalEnergy - incidentMass;
65
66 if(incidentKineticEnergy < 1.)
67 {
68 G4cout << "GHEKaonZeroInelastic: incident energy < 1 GeV" << G4endl;;
69 }
70 if(verboseLevel > 1)
71 {
72 G4cout << "G4HEKaonZeroInelastic::ApplyYourself" << G4endl;
73 G4cout << "incident particle " << incidentParticle.getName()
74 << "mass " << incidentMass
75 << "kinetic energy " << incidentKineticEnergy
76 << G4endl;
77 G4cout << "target material with (A,Z) = ("
78 << atomicWeight << "," << atomicNumber << ")" << G4endl;
79 }
80
81 G4double inelasticity = NuclearInelasticity(incidentKineticEnergy,
82 atomicWeight, atomicNumber);
83 if(verboseLevel > 1)
84 G4cout << "nuclear inelasticity = " << inelasticity << G4endl;
85
86 incidentKineticEnergy -= inelasticity;
87
88 G4double excitationEnergyGNP = 0.;
89 G4double excitationEnergyDTA = 0.;
90
91 G4double excitation = NuclearExcitation(incidentKineticEnergy,
92 atomicWeight, atomicNumber,
93 excitationEnergyGNP,
94 excitationEnergyDTA);
95 if(verboseLevel > 1)
96 G4cout << "nuclear excitation = " << excitation << excitationEnergyGNP
97 << excitationEnergyDTA << G4endl;
98
99
100 incidentKineticEnergy -= excitation;
101 incidentTotalEnergy = incidentKineticEnergy + incidentMass;
102 incidentTotalMomentum = std::sqrt( (incidentTotalEnergy-incidentMass)
103 *(incidentTotalEnergy+incidentMass));
104
105
106 G4HEVector targetParticle;
107 if(G4UniformRand() < atomicNumber/atomicWeight)
108 {
109 targetParticle.setDefinition("Proton");
110 }
111 else
112 {
113 targetParticle.setDefinition("Neutron");
114 }
115
116 G4double targetMass = targetParticle.getMass();
117 G4double centerOfMassEnergy = std::sqrt( incidentMass*incidentMass + targetMass*targetMass
118 + 2.0*targetMass*incidentTotalEnergy);
119 G4double availableEnergy = centerOfMassEnergy - targetMass - incidentMass;
120
121 // this was the meaning of inElastic in the
122 // original Gheisha stand-alone version.
123// G4bool inElastic = InElasticCrossSectionInFirstInt
124// (availableEnergy, incidentCode, incidentTotalMomentum);
125 // by unknown reasons, it has been replaced
126 // to the following code in Geant???
127 G4bool inElastic = true;
128// if (G4UniformRand() < elasticCrossSection/totalCrossSection) inElastic = false;
129
130 vecLength = 0;
131
132 if(verboseLevel > 1)
133 G4cout << "ApplyYourself: CallFirstIntInCascade for particle "
134 << incidentCode << G4endl;
135
136 G4bool successful = false;
137
138 if(inElastic || (!inElastic && atomicWeight < 1.5))
139 {
140 FirstIntInCasKaonZero(inElastic, availableEnergy, pv, vecLength,
141 incidentParticle, targetParticle, atomicWeight);
142
143 if(verboseLevel > 1)
144 G4cout << "ApplyYourself::StrangeParticlePairProduction" << G4endl;
145
146
147 if ((vecLength > 0) && (availableEnergy > 1.))
148 StrangeParticlePairProduction( availableEnergy, centerOfMassEnergy,
149 pv, vecLength,
150 incidentParticle, targetParticle);
151 HighEnergyCascading( successful, pv, vecLength,
152 excitationEnergyGNP, excitationEnergyDTA,
153 incidentParticle, targetParticle,
154 atomicWeight, atomicNumber);
155 if (!successful)
156 HighEnergyClusterProduction( successful, pv, vecLength,
157 excitationEnergyGNP, excitationEnergyDTA,
158 incidentParticle, targetParticle,
159 atomicWeight, atomicNumber);
160 if (!successful)
161 MediumEnergyCascading( successful, pv, vecLength,
162 excitationEnergyGNP, excitationEnergyDTA,
163 incidentParticle, targetParticle,
164 atomicWeight, atomicNumber);
165
166 if (!successful)
167 MediumEnergyClusterProduction( successful, pv, vecLength,
168 excitationEnergyGNP, excitationEnergyDTA,
169 incidentParticle, targetParticle,
170 atomicWeight, atomicNumber);
171 if (!successful)
172 QuasiElasticScattering( successful, pv, vecLength,
173 excitationEnergyGNP, excitationEnergyDTA,
174 incidentParticle, targetParticle,
175 atomicWeight, atomicNumber);
176 }
177 if (!successful)
178 {
179 ElasticScattering( successful, pv, vecLength,
180 incidentParticle,
181 atomicWeight, atomicNumber);
182 }
183
184 if (!successful)
185 G4cout << "GHEInelasticInteraction::ApplyYourself fails to produce final state particles"
186 << G4endl;
187
188 FillParticleChange(pv, vecLength);
189
190 delete [] pv;
191 theParticleChange.SetStatusChange(stopAndKill);
192 return & theParticleChange;
193 }
194
195void
196G4HEKaonZeroInelastic::FirstIntInCasKaonZero( G4bool &inElastic,
197 const G4double availableEnergy,
198 G4HEVector pv[],
199 G4int &vecLen,
200 G4HEVector incidentParticle,
201 G4HEVector targetParticle,
202 const G4double atomicWeight)
203
204// Kaon0 undergoes interaction with nucleon within a nucleus. Check if it is
205// energetically possible to produce pions/kaons. In not, assume nuclear excitation
206// occurs and input particle is degraded in energy. No other particles are produced.
207// If reaction is possible, find the correct number of pions/protons/neutrons
208// produced using an interpolation to multiplicity data. Replace some pions or
209// protons/neutrons by kaons or strange baryons according to the average
210// multiplicity per inelastic reaction.
211
212 {
213 static const G4double expxu = std::log(MAXFLOAT); // upper bound for arg. of exp
214 static const G4double expxl = -expxu; // lower bound for arg. of exp
215
216 static const G4double protb = 0.7;
217 static const G4double neutb = 0.7;
218 static const G4double c = 1.25;
219
220 static const G4int numMul = 1200;
221 static const G4int numSec = 60;
222
223 G4int neutronCode = Neutron.getCode();
224 G4int protonCode = Proton.getCode();
225
226 G4int targetCode = targetParticle.getCode();
227// G4double incidentMass = incidentParticle.getMass();
228// G4double incidentEnergy = incidentParticle.getEnergy();
229 G4double incidentTotalMomentum = incidentParticle.getTotalMomentum();
230
231 static G4bool first = true;
232 static G4double protmul[numMul], protnorm[numSec]; // proton constants
233 static G4double neutmul[numMul], neutnorm[numSec]; // neutron constants
234
235// misc. local variables
236// np = number of pi+, nm = number of pi-, nz = number of pi0
237
238 G4int i, counter, nt, np, nm, nz;
239
240 if( first )
241 { // compute normalization constants, this will only be done once
242 first = false;
243 for( i=0; i<numMul; i++ )protmul[i] = 0.0;
244 for( i=0; i<numSec; i++ )protnorm[i] = 0.0;
245 counter = -1;
246 for( np=0; np<(numSec/3); np++ )
247 {
248 for( nm=std::max(0,np-1); nm<=(np+1); nm++ )
249 {
250 for( nz=0; nz<numSec/3; nz++ )
251 {
252 if( ++counter < numMul )
253 {
254 nt = np+nm+nz;
255 if( (nt>0) && (nt<=numSec) )
256 {
257 protmul[counter] =
258 pmltpc(np,nm,nz,nt,protb,c) ;
259 protnorm[nt-1] += protmul[counter];
260 }
261 }
262 }
263 }
264 }
265 for( i=0; i<numMul; i++ )neutmul[i] = 0.0;
266 for( i=0; i<numSec; i++ )neutnorm[i] = 0.0;
267 counter = -1;
268 for( np=0; np<numSec/3; np++ )
269 {
270 for( nm=np; nm<=(np+2); nm++ )
271 {
272 for( nz=0; nz<numSec/3; nz++ )
273 {
274 if( ++counter < numMul )
275 {
276 nt = np+nm+nz;
277 if( (nt>0) && (nt<=numSec) )
278 {
279 neutmul[counter] =
280 pmltpc(np,nm,nz,nt,neutb,c);
281 neutnorm[nt-1] += neutmul[counter];
282 }
283 }
284 }
285 }
286 }
287 for( i=0; i<numSec; i++ )
288 {
289 if( protnorm[i] > 0.0 )protnorm[i] = 1.0/protnorm[i];
290 if( neutnorm[i] > 0.0 )neutnorm[i] = 1.0/neutnorm[i];
291 }
292 } // end of initialization
293
294
295 // initialize the first two places
296 // the same as beam and target
297 pv[0] = incidentParticle;
298 pv[1] = targetParticle;
299 vecLen = 2;
300
301 if( !inElastic )
302 { // quasi-elastic scattering, no pions produced
303 if( targetCode == protonCode )
304 {
305 G4double cech[] = {0.33,0.27,0.29,0.31,0.27,0.18,0.13,0.10,0.09,0.07};
306 G4int iplab = G4int( std::min( 9.0, incidentTotalMomentum*5. ) );
307 if( G4UniformRand() < cech[iplab]/std::pow(atomicWeight,0.42) )
308 { // charge exchange K+ n -> K0 p
309 pv[0] = KaonPlus;
310 pv[1] = Neutron;
311 }
312 }
313 return;
314 }
315 else if (availableEnergy <= PionPlus.getMass())
316 return;
317
318 // inelastic scattering
319
320 np = 0, nm = 0, nz = 0;
321 G4double eab = availableEnergy;
322 G4int ieab = G4int( eab*5.0 );
323
324 G4double supp[] = {0., 0.4, 0.55, 0.65, 0.75, 0.82, 0.86, 0.90, 0.94, 0.98};
325 if( (ieab <= 9) && (G4UniformRand() >= supp[ieab]) )
326 {
327// suppress high multiplicity events at low momentum
328// only one additional pion will be produced
329 G4double w0, wp, wm, wt, ran;
330 if( targetCode == neutronCode ) // target is a neutron
331 {
332 w0 = - sqr(1.+protb)/(2.*c*c);
333 w0 = std::exp(w0);
334 wm = - sqr(-1.+protb)/(2.*c*c);
335 wm = std::exp(wm);
336 w0 = w0/2.;
337 wm = wm*1.5;
338 if( G4UniformRand() < w0/(w0+wm) ) { np = 0; nm = 0; nz = 1; }
339 else
340 { np = 0; nm = 1; nz = 0; }
341 }
342 else
343 { // target is a proton
344 w0 = -sqr(1.+neutb)/(2.*c*c);
345 wp = w0 = std::exp(w0);
346 wm = -sqr(-1.+neutb)/(2.*c*c);
347 wm = std::exp(wm);
348 wt = w0+wp+wm;
349 wp = w0+wp;
350 ran = G4UniformRand();
351 if( ran < w0/wt)
352 { np = 0; nm = 0; nz = 1; }
353 else if( ran < wp/wt)
354 { np = 1; nm = 0; nz = 0; }
355 else
356 { np = 0; nm = 1; nz = 0; }
357 }
358 }
359 else
360 {
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
489 nt = np + nm + nz;
490 while ( nt > 0)
491 {
492 G4double ran = G4UniformRand();
493 if ( ran < (G4double)np/nt)
494 {
495 if( np > 0 )
496 { pv[vecLen++] = PionPlus;
497 np--;
498 }
499 }
500 else if ( ran < (G4double)(np+nm)/nt)
501 {
502 if( nm > 0 )
503 {
504 pv[vecLen++] = PionMinus;
505 nm--;
506 }
507 }
508 else
509 {
510 if( nz > 0 )
511 {
512 pv[vecLen++] = PionZero;
513 nz--;
514 }
515 }
516 nt = np + nm + nz;
517 }
518 if (verboseLevel > 1)
519 {
520 G4cout << "Particles produced: " ;
521 G4cout << pv[0].getName() << " " ;
522 G4cout << pv[1].getName() << " " ;
523 for (i=2; i < vecLen; i++)
524 {
525 G4cout << pv[i].getName() << " " ;
526 }
527 G4cout << G4endl;
528 }
529 return; }
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