source: trunk/source/processes/hadronic/models/rpg/src/G4RPGAntiKZeroInelastic.cc@ 1199

Last change on this file since 1199 was 1196, checked in by garnier, 16 years ago

update CVS release candidate geant4.9.3.01
File size: 18.2 KB
RevLine 
[819]1//
2// ********************************************************************
3// * License and Disclaimer *
4// * *
5// * The Geant4 software is copyright of the Copyright Holders of *
6// * the Geant4 Collaboration. It is provided under the terms and *
7// * conditions of the Geant4 Software License, included in the file *
8// * LICENSE and available at http://cern.ch/geant4/license . These *
9// * include a list of copyright holders. *
10// * *
11// * Neither the authors of this software system, nor their employing *
12// * institutes,nor the agencies providing financial support for this *
13// * work make any representation or warranty, express or implied, *
14// * regarding this software system or assume any liability for its *
15// * use. Please see the license in the file LICENSE and URL above *
16// * for the full disclaimer and the limitation of liability. *
17// * *
18// * This code implementation is the result of the scientific and *
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 *
22// * use in resulting scientific publications, and indicate your *
23// * acceptance of all terms of the Geant4 Software license. *
24// ********************************************************************
25//
26// $Id: G4RPGAntiKZeroInelastic.cc,v 1.1 2007/07/18 21:04:20 dennis Exp $
[1196]27// GEANT4 tag $Name: geant4-09-03-cand-01 $
[819]28//
29
30#include "G4RPGAntiKZeroInelastic.hh"
31#include "Randomize.hh"
32#include "G4HadReentrentException.hh"
33
34 G4HadFinalState *
35 G4RPGAntiKZeroInelastic::ApplyYourself( const G4HadProjectile &aTrack,
36 G4Nucleus &targetNucleus )
37 {
38 const G4HadProjectile *originalIncident = &aTrack;
39 //
40 // create the target particle
41 //
42 G4DynamicParticle *originalTarget = targetNucleus.ReturnTargetParticle();
43
44 if( verboseLevel > 1 )
45 {
46 const G4Material *targetMaterial = aTrack.GetMaterial();
47 G4cout << "G4RPGAntiKZeroInelastic::ApplyYourself called" << G4endl;
48 G4cout << "kinetic energy = " << originalIncident->GetKineticEnergy()/MeV << "MeV, ";
49 G4cout << "target material = " << targetMaterial->GetName() << ", ";
50 G4cout << "target particle = " << originalTarget->GetDefinition()->GetParticleName()
51 << G4endl;
52 }
53 //
54 // Fermi motion and evaporation
55 // As of Geant3, the Fermi energy calculation had not been Done
56 //
57 G4double ek = originalIncident->GetKineticEnergy()/MeV;
58 G4double amas = originalIncident->GetDefinition()->GetPDGMass()/MeV;
59 G4ReactionProduct modifiedOriginal;
60 modifiedOriginal = *originalIncident;
61
62 G4double tkin = targetNucleus.Cinema( ek );
63 ek += tkin;
64 modifiedOriginal.SetKineticEnergy( ek*MeV );
65 G4double et = ek + amas;
66 G4double p = std::sqrt( std::abs((et-amas)*(et+amas)) );
67 G4double pp = modifiedOriginal.GetMomentum().mag()/MeV;
68 if( pp > 0.0 )
69 {
70 G4ThreeVector momentum = modifiedOriginal.GetMomentum();
71 modifiedOriginal.SetMomentum( momentum * (p/pp) );
72 }
73 //
74 // calculate black track energies
75 //
76 tkin = targetNucleus.EvaporationEffects( ek );
77 ek -= tkin;
78 modifiedOriginal.SetKineticEnergy( ek*MeV );
79 et = ek + amas;
80 p = std::sqrt( std::abs((et-amas)*(et+amas)) );
81 pp = modifiedOriginal.GetMomentum().mag()/MeV;
82 if( pp > 0.0 )
83 {
84 G4ThreeVector momentum = modifiedOriginal.GetMomentum();
85 modifiedOriginal.SetMomentum( momentum * (p/pp) );
86 }
87 G4ReactionProduct currentParticle = modifiedOriginal;
88 G4ReactionProduct targetParticle;
89 targetParticle = *originalTarget;
90 currentParticle.SetSide( 1 ); // incident always goes in forward hemisphere
91 targetParticle.SetSide( -1 ); // target always goes in backward hemisphere
92 G4bool incidentHasChanged = false;
93 G4bool targetHasChanged = false;
94 G4bool quasiElastic = false;
95 G4FastVector<G4ReactionProduct,GHADLISTSIZE> vec; // vec will contain the secondary particles
96 G4int vecLen = 0;
97 vec.Initialize( 0 );
98
99 const G4double cutOff = 0.1;
100 if( currentParticle.GetKineticEnergy()/MeV > cutOff )
101 Cascade( vec, vecLen,
102 originalIncident, currentParticle, targetParticle,
103 incidentHasChanged, targetHasChanged, quasiElastic );
104
105 try
106 {
107 CalculateMomenta( vec, vecLen,
108 originalIncident, originalTarget, modifiedOriginal,
109 targetNucleus, currentParticle, targetParticle,
110 incidentHasChanged, targetHasChanged, quasiElastic );
111 }
112 catch(G4HadReentrentException aR)
113 {
114 aR.Report(G4cout);
115 throw G4HadReentrentException(__FILE__, __LINE__, "Bailing out");
116 }
117 SetUpChange( vec, vecLen,
118 currentParticle, targetParticle,
119 incidentHasChanged );
120
121 delete originalTarget;
122 return &theParticleChange;
123 }
124
125void G4RPGAntiKZeroInelastic::Cascade(
126 G4FastVector<G4ReactionProduct,GHADLISTSIZE> &vec,
127 G4int& vecLen,
128 const G4HadProjectile *originalIncident,
129 G4ReactionProduct &currentParticle,
130 G4ReactionProduct &targetParticle,
131 G4bool &incidentHasChanged,
132 G4bool &targetHasChanged,
133 G4bool &quasiElastic )
134{
135 // Derived from H. Fesefeldt's original FORTRAN code CASK0B
136 //
137 // K0Long undergoes interaction with nucleon within a nucleus. Check if it is
138 // energetically possible to produce pions/kaons. In not, assume nuclear excitation
139 // occurs and input particle is degraded in energy. No other particles are produced.
140 // If reaction is possible, find the correct number of pions/protons/neutrons
141 // produced using an interpolation to multiplicity data. Replace some pions or
142 // protons/neutrons by kaons or strange baryons according to the average
143 // multiplicity per Inelastic reaction.
144
145 const G4double mOriginal = originalIncident->GetDefinition()->GetPDGMass()/MeV;
146 const G4double etOriginal = originalIncident->Get4Momentum().e()/MeV;
147 const G4double pOriginal = originalIncident->Get4Momentum().vect().mag()/MeV;
148 const G4double targetMass = targetParticle.GetMass()/MeV;
149 G4double centerofmassEnergy = std::sqrt( mOriginal*mOriginal +
150 targetMass*targetMass +
151 2.0*targetMass*etOriginal );
152 G4double availableEnergy = centerofmassEnergy-(targetMass+mOriginal);
153
154 static G4bool first = true;
155 const G4int numMul = 1200;
156 const G4int numSec = 60;
157 static G4double protmul[numMul], protnorm[numSec]; // proton constants
158 static G4double neutmul[numMul], neutnorm[numSec]; // neutron constants
159
160 // np = number of pi+, nm = number of pi-, nz = number of pi0
161
162 G4int counter, nt=0, np=0, nm=0, nz=0;
163 const G4double c = 1.25;
164 const G4double b[] = { 0.7, 0.7 };
165 if( first ) // compute normalization constants, this will only be Done once
166 {
167 first = false;
168 G4int i;
169 for( i=0; i<numMul; ++i )protmul[i] = 0.0;
170 for( i=0; i<numSec; ++i )protnorm[i] = 0.0;
171 counter = -1;
172 for( np=0; np<numSec/3; ++np )
173 {
174 for( nm=std::max(0,np-2); nm<=np; ++nm )
175 {
176 for( nz=0; nz<numSec/3; ++nz )
177 {
178 if( ++counter < numMul )
179 {
180 nt = np+nm+nz;
181 if( nt>0 && nt<=numSec )
182 {
183 protmul[counter] = Pmltpc(np,nm,nz,nt,b[0],c);
184 protnorm[nt-1] += protmul[counter];
185 }
186 }
187 }
188 }
189 }
190 for( i=0; i<numMul; ++i )neutmul[i] = 0.0;
191 for( i=0; i<numSec; ++i )neutnorm[i] = 0.0;
192 counter = -1;
193 for( np=0; np<(numSec/3); ++np )
194 {
195 for( nm=std::max(0,np-1); nm<=(np+1); ++nm )
196 {
197 for( nz=0; nz<numSec/3; ++nz )
198 {
199 if( ++counter < numMul )
200 {
201 nt = np+nm+nz;
202 if( nt>0 && nt<=numSec )
203 {
204 neutmul[counter] = Pmltpc(np,nm,nz,nt,b[1],c);
205 neutnorm[nt-1] += neutmul[counter];
206 }
207 }
208 }
209 }
210 }
211 for( i=0; i<numSec; ++i )
212 {
213 if( protnorm[i] > 0.0 )protnorm[i] = 1.0/protnorm[i];
214 if( neutnorm[i] > 0.0 )neutnorm[i] = 1.0/neutnorm[i];
215 }
216 } // end of initialization
217
218 const G4double expxu = 82.; // upper bound for arg. of exp
219 const G4double expxl = -expxu; // lower bound for arg. of exp
220 G4ParticleDefinition *aKaonMinus = G4KaonMinus::KaonMinus();
221 G4ParticleDefinition *aKaonZS = G4KaonZeroShort::KaonZeroShort();
222 G4ParticleDefinition *aKaonZL = G4KaonZeroLong::KaonZeroLong();
223 G4ParticleDefinition *aNeutron = G4Neutron::Neutron();
224 G4ParticleDefinition *aProton = G4Proton::Proton();
225 G4ParticleDefinition *aPiPlus = G4PionPlus::PionPlus();
226 G4ParticleDefinition *aPiMinus = G4PionMinus::PionMinus();
227 G4ParticleDefinition *aPiZero = G4PionZero::PionZero();
228 G4ParticleDefinition *aLambda = G4Lambda::Lambda();
229 G4ParticleDefinition *aSigmaPlus = G4SigmaPlus::SigmaPlus();
230 G4ParticleDefinition *aSigmaMinus = G4SigmaMinus::SigmaMinus();
231 G4ParticleDefinition *aSigmaZero = G4SigmaZero::SigmaZero();
232 const G4double cech[] = {1.,1.,1.,0.70,0.60,0.55,0.35,0.25,0.18,0.15};
233 G4int iplab = G4int(std::min( 9.0, 5.0*pOriginal*MeV/GeV ));
234
235 if( (pOriginal*MeV/GeV <= 2.0) && (G4UniformRand() < cech[iplab]) )
236 {
237 np = nm = nz = nt = 0;
238 iplab = G4int(std::min( 19.0, pOriginal*MeV/GeV*10.0 ));
239 const G4double cnk0[] = {0.17,0.18,0.17,0.24,0.26,0.20,0.22,0.21,0.34,0.45,
240 0.58,0.55,0.36,0.29,0.29,0.32,0.32,0.33,0.33,0.33};
241 if( G4UniformRand() > cnk0[iplab] )
242 {
243 G4double ran = G4UniformRand();
244 if( ran < 0.25 ) // k0Long n --> pi- s+
245 {
246 if( targetParticle.GetDefinition() == aNeutron )
247 {
248 currentParticle.SetDefinitionAndUpdateE( aPiMinus );
249 targetParticle.SetDefinitionAndUpdateE( aSigmaPlus );
250 incidentHasChanged = true;
251 targetHasChanged = true;
252 }
253 }
254 else if( ran < 0.50 ) // k0Long p --> pi+ s0 or k0Long n --> pi0 s0
255 {
256 if( targetParticle.GetDefinition() == aNeutron )
257 currentParticle.SetDefinitionAndUpdateE( aPiZero );
258 else
259 currentParticle.SetDefinitionAndUpdateE( aPiPlus );
260 targetParticle.SetDefinitionAndUpdateE( aSigmaZero );
261 incidentHasChanged = true;
262 targetHasChanged = true;
263 }
264 else if( ran < 0.75 ) // k0Long n --> pi+ s-
265 {
266 if( targetParticle.GetDefinition() == aNeutron )
267 {
268 currentParticle.SetDefinitionAndUpdateE( aPiPlus );
269 targetParticle.SetDefinitionAndUpdateE( aSigmaMinus );
270 incidentHasChanged = true;
271 targetHasChanged = true;
272 }
273 }
274 else // k0Long p --> pi+ L or k0Long n --> pi0 L
275 {
276 if( targetParticle.GetDefinition() == aNeutron )
277 currentParticle.SetDefinitionAndUpdateE( aPiZero );
278 else
279 currentParticle.SetDefinitionAndUpdateE( aPiPlus );
280 targetParticle.SetDefinitionAndUpdateE( aLambda );
281 incidentHasChanged = true;
282 targetHasChanged = true;
283 }
284 }
285 else // ran <= cnk0
286 {
287 quasiElastic = true;
288 if( targetParticle.GetDefinition() == aNeutron )
289 {
290 currentParticle.SetDefinitionAndUpdateE( aKaonMinus );
291 targetParticle.SetDefinitionAndUpdateE( aProton );
292 incidentHasChanged = true;
293 targetHasChanged = true;
294 }
295 }
296 }
297 else // (pOriginal > 2.0*GeV) || (random number >= cech[iplab])
298 {
299 if( availableEnergy < aPiPlus->GetPDGMass()/MeV )
300 {
301 quasiElastic = true;
302 return;
303 }
304 G4double n, anpn;
305 GetNormalizationConstant( availableEnergy, n, anpn );
306 G4double ran = G4UniformRand();
307 G4double dum, test, excs = 0.0;
308 if( targetParticle.GetDefinition() == aProton )
309 {
310 counter = -1;
311 for( np=0; (np<numSec/3) && (ran>=excs); ++np )
312 {
313 for( nm=std::max(0,np-2); nm<=np && ran>=excs; ++nm )
314 {
315 for( nz=0; nz<numSec/3 && ran>=excs; ++nz )
316 {
317 if( ++counter < numMul )
318 {
319 nt = np+nm+nz;
320 if( nt>0 && nt<=numSec )
321 {
322 test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) );
323 dum = (pi/anpn)*nt*protmul[counter]*protnorm[nt-1]/(2.0*n*n);
324 if( std::fabs(dum) < 1.0 )
325 {
326 if( test >= 1.0e-10 )excs += dum*test;
327 }
328 else
329 excs += dum*test;
330 }
331 }
332 }
333 }
334 }
335 if( ran >= excs ) // 3 previous loops continued to the end
336 {
337 quasiElastic = true;
338 return;
339 }
340 np--; nm--; nz--;
341 switch( np-nm )
342 {
343 case 1:
344 if( G4UniformRand() < 0.5 )
345 {
346 currentParticle.SetDefinitionAndUpdateE( aKaonMinus );
347 incidentHasChanged = true;
348 }
349 else
350 {
351 targetParticle.SetDefinitionAndUpdateE( aNeutron );
352 targetHasChanged = true;
353 }
354 case 0:
355 break;
356 default:
357 currentParticle.SetDefinitionAndUpdateE( aKaonMinus );
358 targetParticle.SetDefinitionAndUpdateE( aNeutron );
359 incidentHasChanged = true;
360 targetHasChanged = true;
361 break;
362 }
363 }
364 else // target must be a neutron
365 {
366 counter = -1;
367 for( np=0; np<numSec/3 && ran>=excs; ++np )
368 {
369 for( nm=std::max(0,np-1); nm<=(np+1) && ran>=excs; ++nm )
370 {
371 for( nz=0; nz<numSec/3 && ran>=excs; ++nz )
372 {
373 if( ++counter < numMul )
374 {
375 nt = np+nm+nz;
376 if( nt>0 && nt<=numSec )
377 {
378 test = std::exp( std::min( expxu, std::max( expxl, -(pi/4.0)*(nt*nt)/(n*n) ) ) );
379 dum = (pi/anpn)*nt*neutmul[counter]*neutnorm[nt-1]/(2.0*n*n);
380 if( std::fabs(dum) < 1.0 )
381 {
382 if( test >= 1.0e-10 )excs += dum*test;
383 }
384 else
385 excs += dum*test;
386 }
387 }
388 }
389 }
390 }
391 if( ran >= excs ) // 3 previous loops continued to the end
392 {
393 quasiElastic = true;
394 return;
395 }
396 np--; nm--; nz--;
397 switch( np-nm )
398 {
399 case 0:
400 currentParticle.SetDefinitionAndUpdateE( aKaonMinus );
401 targetParticle.SetDefinitionAndUpdateE( aProton );
402 incidentHasChanged = true;
403 targetHasChanged = true;
404 break;
405 case 1:
406 currentParticle.SetDefinitionAndUpdateE( aKaonMinus );
407 incidentHasChanged = true;
408 break;
409 default:
410 targetParticle.SetDefinitionAndUpdateE( aProton );
411 targetHasChanged = true;
412 break;
413 }
414 }
415 if( G4UniformRand() >= 0.5 )
416 {
417 if( currentParticle.GetDefinition() == aKaonMinus &&
418 targetParticle.GetDefinition() == aNeutron )
419 {
420 ran = G4UniformRand();
421 if( ran < 0.68 )
422 {
423 currentParticle.SetDefinitionAndUpdateE( aPiMinus );
424 targetParticle.SetDefinitionAndUpdateE( aLambda );
425 }
426 else if( ran < 0.84 )
427 {
428 currentParticle.SetDefinitionAndUpdateE( aPiMinus );
429 targetParticle.SetDefinitionAndUpdateE( aSigmaZero );
430 }
431 else
432 {
433 currentParticle.SetDefinitionAndUpdateE( aPiZero );
434 targetParticle.SetDefinitionAndUpdateE( aSigmaMinus );
435 }
436 }
437 else if( (currentParticle.GetDefinition() == aKaonZS ||
438 currentParticle.GetDefinition() == aKaonZL ) &&
439 targetParticle.GetDefinition() == aProton )
440 {
441 ran = G4UniformRand();
442 if( ran < 0.68 )
443 {
444 currentParticle.SetDefinitionAndUpdateE( aPiPlus );
445 targetParticle.SetDefinitionAndUpdateE( aLambda );
446 }
447 else if( ran < 0.84 )
448 {
449 currentParticle.SetDefinitionAndUpdateE( aPiZero );
450 targetParticle.SetDefinitionAndUpdateE( aSigmaPlus );
451 }
452 else
453 {
454 currentParticle.SetDefinitionAndUpdateE( aPiPlus );
455 targetParticle.SetDefinitionAndUpdateE( aSigmaZero );
456 }
457 }
458 else
459 {
460 ran = G4UniformRand();
461 if( ran < 0.67 )
462 {
463 currentParticle.SetDefinitionAndUpdateE( aPiZero );
464 targetParticle.SetDefinitionAndUpdateE( aLambda );
465 }
466 else if( ran < 0.78 )
467 {
468 currentParticle.SetDefinitionAndUpdateE( aPiMinus );
469 targetParticle.SetDefinitionAndUpdateE( aSigmaPlus );
470 }
471 else if( ran < 0.89 )
472 {
473 currentParticle.SetDefinitionAndUpdateE( aPiZero );
474 targetParticle.SetDefinitionAndUpdateE( aSigmaZero );
475 }
476 else
477 {
478 currentParticle.SetDefinitionAndUpdateE( aPiPlus );
479 targetParticle.SetDefinitionAndUpdateE( aSigmaMinus );
480 }
481 }
482 incidentHasChanged = true;
483 targetHasChanged = true;
484 }
485 }
486 if( currentParticle.GetDefinition() == aKaonZL )
487 {
488 if( G4UniformRand() >= 0.5 )
489 {
490 currentParticle.SetDefinitionAndUpdateE( aKaonZS );
491 incidentHasChanged = true;
492 }
493 }
494 if( targetParticle.GetDefinition() == aKaonZL )
495 {
496 if( G4UniformRand() >= 0.5 )
497 {
498 targetParticle.SetDefinitionAndUpdateE( aKaonZS );
499 targetHasChanged = true;
500 }
501 }
502 SetUpPions( np, nm, nz, vec, vecLen );
503 return;
504}
505
506 /* end of file */
507
Note: See TracBrowser for help on using the repository browser.