source: trunk/source/processes/hadronic/models/high_energy/src/G4HEAntiSigmaMinusInelastic.cc@ 1036

Last change on this file since 1036 was 1007, checked in by garnier, 17 years ago

update to geant4.9.2
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19// * technical work of the GEANT4 collaboration. *
20// * By using, copying, modifying or distributing the software (or *
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25//
26//
27// $Id: G4HEAntiSigmaMinusInelastic.cc,v 1.15 2008/03/17 20:49:17 dennis Exp $
28// GEANT4 tag $Name: geant4-09-02 $
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 "G4HEAntiSigmaMinusInelastic.hh"
46
47G4HadFinalState * G4HEAntiSigmaMinusInelastic::
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 atomicWeight = targetNucleus.GetN();
54 const G4double atomicNumber = targetNucleus.GetZ();
55 G4HEVector incidentParticle(aParticle);
56
57 G4int incidentCode = incidentParticle.getCode();
58 G4double incidentMass = incidentParticle.getMass();
59 G4double incidentTotalEnergy = incidentParticle.getEnergy();
60 G4double incidentTotalMomentum = incidentParticle.getTotalMomentum();
61 G4double incidentKineticEnergy = incidentTotalEnergy - incidentMass;
62
63 if(incidentKineticEnergy < 1.)
64 {
65 G4cout << "GHEAntiSigmaMinusInelastic: incident energy < 1 GeV" << G4endl;
66 }
67 if(verboseLevel > 1)
68 {
69 G4cout << "G4HEAntiSigmaMinusInelastic::ApplyYourself" << G4endl;
70 G4cout << "incident particle " << incidentParticle.getName()
71 << "mass " << incidentMass
72 << "kinetic energy " << incidentKineticEnergy
73 << G4endl;
74 G4cout << "target material with (A,Z) = ("
75 << atomicWeight << "," << atomicNumber << ")" << G4endl;
76 }
77
78 G4double inelasticity = NuclearInelasticity(incidentKineticEnergy,
79 atomicWeight, atomicNumber);
80 if(verboseLevel > 1)
81 G4cout << "nuclear inelasticity = " << inelasticity << G4endl;
82
83 incidentKineticEnergy -= inelasticity;
84
85 G4double excitationEnergyGNP = 0.;
86 G4double excitationEnergyDTA = 0.;
87
88 G4double excitation = NuclearExcitation(incidentKineticEnergy,
89 atomicWeight, atomicNumber,
90 excitationEnergyGNP,
91 excitationEnergyDTA);
92 if(verboseLevel > 1)
93 G4cout << "nuclear excitation = " << excitation << excitationEnergyGNP
94 << excitationEnergyDTA << G4endl;
95
96
97 incidentKineticEnergy -= excitation;
98 incidentTotalEnergy = incidentKineticEnergy + incidentMass;
99 incidentTotalMomentum = std::sqrt( (incidentTotalEnergy-incidentMass)
100 *(incidentTotalEnergy+incidentMass));
101
102 G4HEVector targetParticle;
103 if(G4UniformRand() < atomicNumber/atomicWeight)
104 {
105 targetParticle.setDefinition("Proton");
106 }
107 else
108 {
109 targetParticle.setDefinition("Neutron");
110 }
111
112 G4double targetMass = targetParticle.getMass();
113 G4double centerOfMassEnergy = std::sqrt( incidentMass*incidentMass + targetMass*targetMass
114 + 2.0*targetMass*incidentTotalEnergy);
115 G4double availableEnergy = centerOfMassEnergy - targetMass - incidentMass;
116
117 // this was the meaning of inElastic in the
118 // original Gheisha stand-alone version.
119// G4bool inElastic = InElasticCrossSectionInFirstInt
120// (availableEnergy, incidentCode, incidentTotalMomentum);
121 // by unknown reasons, it has been replaced
122 // to the following code in Geant???
123 G4bool inElastic = true;
124// if (G4UniformRand() < elasticCrossSection/totalCrossSection) inElastic = false;
125
126 vecLength = 0;
127
128 if(verboseLevel > 1)
129 G4cout << "ApplyYourself: CallFirstIntInCascade for particle "
130 << incidentCode << G4endl;
131
132 G4bool successful = false;
133
134 if(inElastic || (!inElastic && atomicWeight < 1.5))
135 {
136 FirstIntInCasAntiSigmaMinus(inElastic, availableEnergy, pv, vecLength,
137 incidentParticle, targetParticle, atomicWeight);
138
139 if(verboseLevel > 1)
140 G4cout << "ApplyYourself::StrangeParticlePairProduction" << G4endl;
141
142
143 if ((vecLength > 0) && (availableEnergy > 1.))
144 StrangeParticlePairProduction( availableEnergy, centerOfMassEnergy,
145 pv, vecLength,
146 incidentParticle, targetParticle);
147 HighEnergyCascading( successful, pv, vecLength,
148 excitationEnergyGNP, excitationEnergyDTA,
149 incidentParticle, targetParticle,
150 atomicWeight, atomicNumber);
151 if (!successful)
152 HighEnergyClusterProduction( successful, pv, vecLength,
153 excitationEnergyGNP, excitationEnergyDTA,
154 incidentParticle, targetParticle,
155 atomicWeight, atomicNumber);
156 if (!successful)
157 MediumEnergyCascading( successful, pv, vecLength,
158 excitationEnergyGNP, excitationEnergyDTA,
159 incidentParticle, targetParticle,
160 atomicWeight, atomicNumber);
161
162 if (!successful)
163 MediumEnergyClusterProduction( successful, pv, vecLength,
164 excitationEnergyGNP, excitationEnergyDTA,
165 incidentParticle, targetParticle,
166 atomicWeight, atomicNumber);
167 if (!successful)
168 QuasiElasticScattering( successful, pv, vecLength,
169 excitationEnergyGNP, excitationEnergyDTA,
170 incidentParticle, targetParticle,
171 atomicWeight, atomicNumber);
172 }
173 if (!successful)
174 {
175 ElasticScattering( successful, pv, vecLength,
176 incidentParticle,
177 atomicWeight, atomicNumber);
178 }
179
180 if (!successful)
181 {
182 G4cout << "GHEInelasticInteraction::ApplyYourself fails to produce final state particles" << G4endl;
183 }
184 FillParticleChange(pv, vecLength);
185 delete [] pv;
186 theParticleChange.SetStatusChange(stopAndKill);
187 return & theParticleChange;
188 }
189
190void
191G4HEAntiSigmaMinusInelastic::FirstIntInCasAntiSigmaMinus( G4bool &inElastic,
192 const G4double availableEnergy,
193 G4HEVector pv[],
194 G4int &vecLen,
195 G4HEVector incidentParticle,
196 G4HEVector targetParticle,
197 const G4double atomicWeight)
198
199// AntiSigma- undergoes interaction with nucleon within a nucleus. Check if it is
200// energetically possible to produce pions/kaons. In not, assume nuclear excitation
201// occurs and input particle is degraded in energy. No other particles are produced.
202// If reaction is possible, find the correct number of pions/protons/neutrons
203// produced using an interpolation to multiplicity data. Replace some pions or
204// protons/neutrons by kaons or strange baryons according to the average
205// multiplicity per inelastic reaction.
206
207 {
208 static const G4double expxu = std::log(MAXFLOAT); // upper bound for arg. of exp
209 static const G4double expxl = -expxu; // lower bound for arg. of exp
210
211 static const G4double protb = 0.7;
212 static const G4double neutb = 0.7;
213 static const G4double c = 1.25;
214
215 static const G4int numMul = 1200;
216 static const G4int numMulAn = 400;
217 static const G4int numSec = 60;
218
219 G4int neutronCode = Neutron.getCode();
220 G4int protonCode = Proton.getCode();
221
222 G4int targetCode = targetParticle.getCode();
223// G4double incidentMass = incidentParticle.getMass();
224// G4double incidentEnergy = incidentParticle.getEnergy();
225 G4double incidentTotalMomentum = incidentParticle.getTotalMomentum();
226
227 static G4bool first = true;
228 static G4double protmul[numMul], protnorm[numSec]; // proton constants
229 static G4double protmulAn[numMulAn],protnormAn[numSec];
230 static G4double neutmul[numMul], neutnorm[numSec]; // neutron constants
231 static G4double neutmulAn[numMulAn],neutnormAn[numSec];
232
233 // misc. local variables
234 // np = number of pi+, nm = number of pi-, nz = number of pi0
235
236 G4int i, counter, nt, np, nm, nz;
237
238 if( first )
239 { // compute normalization constants, this will only be done once
240 first = false;
241 for( i=0; i<numMul ; i++ ) protmul[i] = 0.0;
242 for( i=0; i<numSec ; i++ ) protnorm[i] = 0.0;
243 counter = -1;
244 for( np=0; np<(numSec/3); np++ )
245 {
246 for( nm=std::max(0,np-2); nm<=np; nm++ )
247 {
248 for( nz=0; nz<numSec/3; nz++ )
249 {
250 if( ++counter < numMul )
251 {
252 nt = np+nm+nz;
253 if( (nt>0) && (nt<=numSec) )
254 {
255 protmul[counter] = pmltpc(np,nm,nz,nt,protb,c);
256 protnorm[nt-1] += protmul[counter];
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 {
267 for( nm=std::max(0,np-1); nm<=(np+1); nm++ )
268 {
269 for( nz=0; nz<numSec/3; nz++ )
270 {
271 if( ++counter < numMul )
272 {
273 nt = np+nm+nz;
274 if( (nt>0) && (nt<=numSec) )
275 {
276 neutmul[counter] = pmltpc(np,nm,nz,nt,neutb,c);
277 neutnorm[nt-1] += neutmul[counter];
278 }
279 }
280 }
281 }
282 }
283 for( i=0; i<numSec; i++ )
284 {
285 if( protnorm[i] > 0.0 )protnorm[i] = 1.0/protnorm[i];
286 if( neutnorm[i] > 0.0 )neutnorm[i] = 1.0/neutnorm[i];
287 }
288 // annihilation
289 for( i=0; i<numMulAn ; i++ ) protmulAn[i] = 0.0;
290 for( i=0; i<numSec ; i++ ) protnormAn[i] = 0.0;
291 counter = -1;
292 for( np=1; np<(numSec/3); np++ )
293 {
294 nm = std::max(0,np-2);
295 for( nz=0; nz<numSec/3; nz++ )
296 {
297 if( ++counter < numMulAn )
298 {
299 nt = np+nm+nz;
300 if( (nt>1) && (nt<=numSec) )
301 {
302 protmulAn[counter] = pmltpc(np,nm,nz,nt,protb,c);
303 protnormAn[nt-1] += protmulAn[counter];
304 }
305 }
306 }
307 }
308 for( i=0; i<numMulAn; i++ ) neutmulAn[i] = 0.0;
309 for( i=0; i<numSec; i++ ) neutnormAn[i] = 0.0;
310 counter = -1;
311 for( np=0; np<numSec/3; np++ )
312 {
313 nm = np-1;
314 for( nz=0; nz<numSec/3; nz++ )
315 {
316 if( ++counter < numMulAn )
317 {
318 nt = np+nm+nz;
319 if( (nt>1) && (nt<=numSec) )
320 {
321 neutmulAn[counter] = pmltpc(np,nm,nz,nt,neutb,c);
322 neutnormAn[nt-1] += neutmulAn[counter];
323 }
324 }
325 }
326 }
327 for( i=0; i<numSec; i++ )
328 {
329 if( protnormAn[i] > 0.0 )protnormAn[i] = 1.0/protnormAn[i];
330 if( neutnormAn[i] > 0.0 )neutnormAn[i] = 1.0/neutnormAn[i];
331 }
332 } // end of initialization
333
334
335 // initialize the first two places
336 // the same as beam and target
337 pv[0] = incidentParticle;
338 pv[1] = targetParticle;
339 vecLen = 2;
340
341 if( !inElastic )
342 { // some two-body reactions
343 G4double cech[] = {0.50, 0.45, 0.40, 0.35, 0.30, 0.25, 0.06, 0.04, 0.005, 0.};
344
345 G4int iplab = std::min(9, G4int( incidentTotalMomentum*2.5 ));
346 if( G4UniformRand() < cech[iplab]/std::pow(atomicWeight,0.42) )
347 {
348 G4double ran = G4UniformRand();
349
350 if ( targetCode == neutronCode)
351 {
352 if(ran < 0.2)
353 {
354 pv[0] = AntiSigmaZero;
355 pv[1] = Proton;
356 }
357 else if (ran < 0.4)
358 {
359 pv[0] = AntiLambda;
360 pv[1] = Proton;
361 }
362 else if (ran < 0.6)
363 {
364 pv[0] = Proton;
365 pv[1] = AntiLambda;
366 }
367 else if (ran < 0.8)
368 {
369 pv[0] = Proton;
370 pv[1] = AntiSigmaZero;
371 }
372 else
373 {
374 pv[0] = Neutron;
375 pv[1] = AntiSigmaMinus;
376 }
377 }
378 else
379 {
380 pv[0] = Proton;
381 pv[1] = AntiSigmaMinus;
382 }
383 }
384 return;
385 }
386 else if (availableEnergy <= PionPlus.getMass())
387 return;
388
389 // inelastic scattering
390
391 np = 0; nm = 0; nz = 0;
392 G4double anhl[] = {1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 1.00, 0.97, 0.88,
393 0.85, 0.81, 0.75, 0.64, 0.64, 0.55, 0.55, 0.45, 0.47, 0.40,
394 0.39, 0.36, 0.33, 0.10, 0.01};
395 G4int iplab = G4int( incidentTotalMomentum*10.);
396 if ( iplab > 9) iplab = 10 + G4int( (incidentTotalMomentum -1.)*5. );
397 if ( iplab > 14) iplab = 15 + G4int( incidentTotalMomentum -2. );
398 if ( iplab > 22) iplab = 23 + G4int( (incidentTotalMomentum -10.)/10.);
399 iplab = std::min(24, iplab);
400
401 if ( G4UniformRand() > anhl[iplab] )
402 { // non- annihilation channels
403
404 // number of total particles vs. centre of mass Energy - 2*proton mass
405
406 G4double aleab = std::log(availableEnergy);
407 G4double n = 3.62567+aleab*(0.665843+aleab*(0.336514
408 + aleab*(0.117712+0.0136912*aleab))) - 2.0;
409
410 // normalization constant for kno-distribution.
411 // calculate first the sum of all constants, check for numerical problems.
412 G4double test, dum, anpn = 0.0;
413
414 for (nt=1; nt<=numSec; nt++) {
415 test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) );
416 dum = pi*nt/(2.0*n*n);
417 if (std::fabs(dum) < 1.0) {
418 if( test >= 1.0e-10 )anpn += dum*test;
419 } else {
420 anpn += dum*test;
421 }
422 }
423
424 G4double ran = G4UniformRand();
425 G4double excs = 0.0;
426 if( targetCode == protonCode )
427 {
428 counter = -1;
429 for( np=0; np<numSec/3; np++ )
430 {
431 for( nm=std::max(0,np-2); nm<=np; nm++ )
432 {
433 for( nz=0; nz<numSec/3; nz++ )
434 {
435 if( ++counter < numMul )
436 {
437 nt = np+nm+nz;
438 if ( (nt>0) && (nt<=numSec) ) {
439 test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) );
440 dum = (pi/anpn)*nt*protmul[counter]*protnorm[nt-1]/(2.0*n*n);
441 if (std::fabs(dum) < 1.0) {
442 if( test >= 1.0e-10 )excs += dum*test;
443 } else {
444 excs += dum*test;
445 }
446
447 if (ran < excs) goto outOfLoop; //----------------------->
448 }
449 }
450 }
451 }
452 }
453
454 // 3 previous loops continued to the end
455 inElastic = false; // quasi-elastic scattering
456 return;
457 }
458 else
459 { // target must be a neutron
460 counter = -1;
461 for( np=0; np<numSec/3; np++ )
462 {
463 for( nm=std::max(0,np-1); nm<=(np+1); nm++ )
464 {
465 for( nz=0; nz<numSec/3; nz++ )
466 {
467 if( ++counter < numMul )
468 {
469 nt = np+nm+nz;
470 if ( (nt>0) && (nt<=numSec) ) {
471 test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) );
472 dum = (pi/anpn)*nt*neutmul[counter]*neutnorm[nt-1]/(2.0*n*n);
473 if (std::fabs(dum) < 1.0) {
474 if( test >= 1.0e-10 )excs += dum*test;
475 } else {
476 excs += dum*test;
477 }
478
479 if (ran < excs) goto outOfLoop; // -------------------------->
480 }
481 }
482 }
483 }
484 }
485 // 3 previous loops continued to the end
486 inElastic = false; // quasi-elastic scattering.
487 return;
488 }
489
490 outOfLoop: // <------------------------------------------------------------------------
491
492 ran = G4UniformRand();
493
494 if( targetCode == protonCode)
495 {
496 if( np == nm)
497 {
498 }
499 else if (np == (nm+1))
500 {
501 if( ran < 0.50)
502 {
503 pv[1] = Neutron;
504 }
505 else if (ran < 0.75)
506 {
507 pv[0] = AntiSigmaZero;
508 }
509 else
510 {
511 pv[0] = AntiLambda;
512 }
513 }
514 else
515 {
516 if (ran < 0.5)
517 {
518 pv[0] = AntiSigmaZero;
519 pv[1] = Neutron;
520 }
521 else
522 {
523 pv[0] = AntiLambda;
524 pv[1] = Neutron;
525 }
526 }
527 }
528 else
529 {
530 if( np == nm)
531 {
532 if (ran < 0.5)
533 {
534 }
535 else if(ran < 0.75)
536 {
537 pv[0] = AntiSigmaZero;
538 pv[1] = Proton;
539 }
540 else
541 {
542 pv[0] = AntiLambda;
543 pv[1] = Proton;
544 }
545 }
546 else if ( np == (nm+1))
547 {
548 if (ran < 0.5)
549 {
550 pv[0] = AntiSigmaZero;
551 }
552 else
553 {
554 pv[0] = AntiLambda;
555 }
556 }
557 else
558 {
559 pv[1] = Proton;
560 }
561 }
562
563 }
564 else // annihilation
565 {
566 if ( availableEnergy > 2. * PionPlus.getMass() )
567 {
568
569 G4double aleab = std::log(availableEnergy);
570 G4double n = 3.62567+aleab*(0.665843+aleab*(0.336514
571 + aleab*(0.117712+0.0136912*aleab))) - 2.0;
572
573 // normalization constant for kno-distribution.
574 // calculate first the sum of all constants, check for numerical problems.
575 G4double test, dum, anpn = 0.0;
576
577 for (nt=2; nt<=numSec; nt++) {
578 test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) );
579 dum = pi*nt/(2.0*n*n);
580 if (std::fabs(dum) < 1.0) {
581 if( test >= 1.0e-10 )anpn += dum*test;
582 } else {
583 anpn += dum*test;
584 }
585 }
586
587 G4double ran = G4UniformRand();
588 G4double excs = 0.0;
589 if( targetCode == protonCode )
590 {
591 counter = -1;
592 for( np=2; np<numSec/3; np++ )
593 {
594 nm = np-2;
595 for( nz=0; nz<numSec/3; nz++ )
596 {
597 if( ++counter < numMulAn )
598 {
599 nt = np+nm+nz;
600 if ( (nt>1) && (nt<=numSec) ) {
601 test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) );
602 dum = (pi/anpn)*nt*protmulAn[counter]*protnormAn[nt-1]/(2.0*n*n);
603 if (std::fabs(dum) < 1.0) {
604 if( test >= 1.0e-10 )excs += dum*test;
605 } else {
606 excs += dum*test;
607 }
608
609 if (ran < excs) goto outOfLoopAn; //----------------------->
610 }
611 }
612 }
613 }
614 // 3 previous loops continued to the end
615 inElastic = false; // quasi-elastic scattering
616 return;
617 }
618 else
619 { // target must be a neutron
620 counter = -1;
621 for( np=1; np<numSec/3; np++ )
622 {
623 nm = np-1;
624 for( nz=0; nz<numSec/3; nz++ )
625 {
626 if (++counter < numMulAn) {
627 nt = np+nm+nz;
628 if ( (nt>1) && (nt<=numSec) ) {
629 test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) );
630 dum = (pi/anpn)*nt*neutmulAn[counter]*neutnormAn[nt-1]/(2.0*n*n);
631 if (std::fabs(dum) < 1.0) {
632 if( test >= 1.0e-10 )excs += dum*test;
633 } else {
634 excs += dum*test;
635 }
636
637 if (ran < excs) goto outOfLoopAn; // -------------------------->
638 }
639 }
640 }
641 }
642 inElastic = false; // quasi-elastic scattering.
643 return;
644 }
645 outOfLoopAn: // <------------------------------------------------------------------
646 vecLen = 0;
647 }
648 }
649
650 nt = np + nm + nz;
651 while ( nt > 0)
652 {
653 G4double ran = G4UniformRand();
654 if ( ran < (G4double)np/nt)
655 {
656 if( np > 0 )
657 { pv[vecLen++] = PionPlus;
658 np--;
659 }
660 }
661 else if ( ran < (G4double)(np+nm)/nt)
662 {
663 if( nm > 0 )
664 {
665 pv[vecLen++] = PionMinus;
666 nm--;
667 }
668 }
669 else
670 {
671 if( nz > 0 )
672 {
673 pv[vecLen++] = PionZero;
674 nz--;
675 }
676 }
677 nt = np + nm + nz;
678 }
679 if (verboseLevel > 1)
680 {
681 G4cout << "Particles produced: " ;
682 G4cout << pv[0].getName() << " " ;
683 G4cout << pv[1].getName() << " " ;
684 for (i=2; i < vecLen; i++)
685 {
686 G4cout << pv[i].getName() << " " ;
687 }
688 G4cout << G4endl;
689 }
690 return;
691 }
692
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