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: G4RPGFragmentation.cc,v 1.3 2007/12/06 01:13:14 dennis Exp $ |
---|
27 | // GEANT4 tag $Name: geant4-09-01-patch-02 $ |
---|
28 | // |
---|
29 | |
---|
30 | #include "G4RPGFragmentation.hh" |
---|
31 | #include "G4AntiProton.hh" |
---|
32 | #include "G4AntiNeutron.hh" |
---|
33 | #include "Randomize.hh" |
---|
34 | #include "G4Poisson.hh" |
---|
35 | #include <iostream> |
---|
36 | #include "G4HadReentrentException.hh" |
---|
37 | #include <signal.h> |
---|
38 | |
---|
39 | |
---|
40 | G4RPGFragmentation::G4RPGFragmentation() |
---|
41 | : G4RPGReaction() {} |
---|
42 | |
---|
43 | |
---|
44 | void G4RPGFragmentation:: |
---|
45 | FragmentationIntegral(G4double pt, G4double et, G4double parMass, G4double secMass) |
---|
46 | { |
---|
47 | pt = std::max( 0.001, pt ); |
---|
48 | G4double dx = 1./(19.*pt); |
---|
49 | G4double x; |
---|
50 | G4double term1; |
---|
51 | G4double term2; |
---|
52 | |
---|
53 | for (G4int i = 1; i < 20; i++) { |
---|
54 | x = (G4double(i) - 0.5)*dx; |
---|
55 | term1 = 1. + parMass*parMass*x*x; |
---|
56 | term2 = pt*x*et*pt*x*et + pt*pt + secMass*secMass; |
---|
57 | dndl[i] = dx / std::sqrt( term1*term1*term1*term2 ) |
---|
58 | + dndl[i-1]; |
---|
59 | } |
---|
60 | } |
---|
61 | |
---|
62 | |
---|
63 | G4bool G4RPGFragmentation:: |
---|
64 | ReactionStage(const G4HadProjectile* originalIncident, |
---|
65 | G4ReactionProduct& modifiedOriginal, |
---|
66 | G4bool& incidentHasChanged, |
---|
67 | const G4DynamicParticle* originalTarget, |
---|
68 | G4ReactionProduct& targetParticle, |
---|
69 | G4bool& targetHasChanged, |
---|
70 | const G4Nucleus& targetNucleus, |
---|
71 | G4ReactionProduct& currentParticle, |
---|
72 | G4FastVector<G4ReactionProduct,256>& vec, |
---|
73 | G4int& vecLen, |
---|
74 | G4bool leadFlag, |
---|
75 | G4ReactionProduct& leadingStrangeParticle) |
---|
76 | { |
---|
77 | // |
---|
78 | // Derived from H. Fesefeldt's original FORTRAN code GENXPT |
---|
79 | // |
---|
80 | // Generation of x- and pT- values for incident, target, and all secondary |
---|
81 | // particles using a simple single variable description E D3S/DP3= F(Q) |
---|
82 | // with Q^2 = (M*X)^2 + PT^2. Final state kinematics are produced by an |
---|
83 | // FF-type iterative cascade method |
---|
84 | // |
---|
85 | // Internal units are GeV |
---|
86 | // |
---|
87 | |
---|
88 | // Protection in case no secondary has been created. In that case use |
---|
89 | // two-body scattering |
---|
90 | // |
---|
91 | if(vecLen == 0) return false; |
---|
92 | |
---|
93 | G4ParticleDefinition *aPiMinus = G4PionMinus::PionMinus(); |
---|
94 | G4ParticleDefinition *aProton = G4Proton::Proton(); |
---|
95 | G4ParticleDefinition *aNeutron = G4Neutron::Neutron(); |
---|
96 | G4ParticleDefinition *aPiPlus = G4PionPlus::PionPlus(); |
---|
97 | G4ParticleDefinition *aPiZero = G4PionZero::PionZero(); |
---|
98 | |
---|
99 | G4int i, l; |
---|
100 | G4bool veryForward = false; |
---|
101 | |
---|
102 | const G4double ekOriginal = modifiedOriginal.GetKineticEnergy()/GeV; |
---|
103 | const G4double etOriginal = modifiedOriginal.GetTotalEnergy()/GeV; |
---|
104 | const G4double mOriginal = modifiedOriginal.GetMass()/GeV; |
---|
105 | const G4double pOriginal = modifiedOriginal.GetMomentum().mag()/GeV; |
---|
106 | G4double targetMass = targetParticle.GetDefinition()->GetPDGMass()/GeV; |
---|
107 | G4double centerofmassEnergy = std::sqrt( mOriginal*mOriginal + |
---|
108 | targetMass*targetMass + |
---|
109 | 2.0*targetMass*etOriginal ); // GeV |
---|
110 | G4double currentMass = currentParticle.GetMass()/GeV; |
---|
111 | targetMass = targetParticle.GetMass()/GeV; |
---|
112 | // |
---|
113 | // randomize the order of the secondary particles |
---|
114 | // note that the current and target particles are not affected |
---|
115 | // |
---|
116 | for( i=0; i<vecLen; ++i ) |
---|
117 | { |
---|
118 | G4int itemp = G4int( G4UniformRand()*vecLen ); |
---|
119 | G4ReactionProduct pTemp = *vec[itemp]; |
---|
120 | *vec[itemp] = *vec[i]; |
---|
121 | *vec[i] = pTemp; |
---|
122 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
123 | } |
---|
124 | |
---|
125 | if( currentMass == 0.0 && targetMass == 0.0 ) |
---|
126 | { |
---|
127 | // Target and projectile have annihilated. Replace them with the first |
---|
128 | // two secondaries in the list. Current particle KE is maintained. |
---|
129 | |
---|
130 | G4double ek = currentParticle.GetKineticEnergy(); |
---|
131 | G4ThreeVector m = currentParticle.GetMomentum(); |
---|
132 | currentParticle = *vec[0]; |
---|
133 | targetParticle = *vec[1]; |
---|
134 | for( i=0; i<(vecLen-2); ++i )*vec[i] = *vec[i+2]; |
---|
135 | G4ReactionProduct *temp = vec[vecLen-1]; |
---|
136 | delete temp; |
---|
137 | temp = vec[vecLen-2]; |
---|
138 | delete temp; |
---|
139 | vecLen -= 2; |
---|
140 | currentMass = currentParticle.GetMass()/GeV; |
---|
141 | targetMass = targetParticle.GetMass()/GeV; |
---|
142 | incidentHasChanged = true; |
---|
143 | targetHasChanged = true; |
---|
144 | currentParticle.SetKineticEnergy( ek ); |
---|
145 | currentParticle.SetMomentum( m ); |
---|
146 | veryForward = true; |
---|
147 | } |
---|
148 | const G4double atomicWeight = targetNucleus.GetN(); |
---|
149 | const G4double atomicNumber = targetNucleus.GetZ(); |
---|
150 | const G4double protonMass = aProton->GetPDGMass()/MeV; |
---|
151 | |
---|
152 | if (originalIncident->GetDefinition()->GetParticleSubType() == "kaon" |
---|
153 | && G4UniformRand() >= 0.7) { |
---|
154 | G4ReactionProduct temp = currentParticle; |
---|
155 | currentParticle = targetParticle; |
---|
156 | targetParticle = temp; |
---|
157 | incidentHasChanged = true; |
---|
158 | targetHasChanged = true; |
---|
159 | currentMass = currentParticle.GetMass()/GeV; |
---|
160 | targetMass = targetParticle.GetMass()/GeV; |
---|
161 | } |
---|
162 | const G4double afc = std::min( 0.75, |
---|
163 | 0.312+0.200*std::log(std::log(centerofmassEnergy*centerofmassEnergy))+ |
---|
164 | std::pow(centerofmassEnergy*centerofmassEnergy,1.5)/6000.0 ); |
---|
165 | |
---|
166 | G4double freeEnergy = centerofmassEnergy-currentMass-targetMass; |
---|
167 | G4double forwardEnergy = freeEnergy/2.; |
---|
168 | G4int forwardCount = 1; // number of particles in forward hemisphere |
---|
169 | |
---|
170 | G4double backwardEnergy = freeEnergy/2.; |
---|
171 | G4int backwardCount = 1; // number of particles in backward hemisphere |
---|
172 | |
---|
173 | if(veryForward) |
---|
174 | { |
---|
175 | if(currentParticle.GetSide()==-1) |
---|
176 | { |
---|
177 | forwardEnergy += currentMass; |
---|
178 | forwardCount --; |
---|
179 | backwardEnergy -= currentMass; |
---|
180 | backwardCount ++; |
---|
181 | } |
---|
182 | if(targetParticle.GetSide()!=-1) |
---|
183 | { |
---|
184 | backwardEnergy += targetMass; |
---|
185 | backwardCount --; |
---|
186 | forwardEnergy -= targetMass; |
---|
187 | forwardCount ++; |
---|
188 | } |
---|
189 | } |
---|
190 | |
---|
191 | for( i=0; i<vecLen; ++i ) |
---|
192 | { |
---|
193 | if( vec[i]->GetSide() == -1 ) |
---|
194 | { |
---|
195 | ++backwardCount; |
---|
196 | backwardEnergy -= vec[i]->GetMass()/GeV; |
---|
197 | } else { |
---|
198 | ++forwardCount; |
---|
199 | forwardEnergy -= vec[i]->GetMass()/GeV; |
---|
200 | } |
---|
201 | } |
---|
202 | // |
---|
203 | // Add particles from intranuclear cascade. |
---|
204 | // nuclearExcitationCount = number of new secondaries produced by nuclear excitation |
---|
205 | // extraCount = number of nucleons within these new secondaries |
---|
206 | // |
---|
207 | G4double xtarg; |
---|
208 | if( centerofmassEnergy < (2.0+G4UniformRand()) ) |
---|
209 | xtarg = afc * (std::pow(atomicWeight,0.33)-1.0) * (2.0*backwardCount+vecLen+2)/2.0; |
---|
210 | else |
---|
211 | xtarg = afc * (std::pow(atomicWeight,0.33)-1.0) * (2.0*backwardCount); |
---|
212 | if( xtarg <= 0.0 )xtarg = 0.01; |
---|
213 | G4int nuclearExcitationCount = G4Poisson( xtarg ); |
---|
214 | if(atomicWeight<1.0001) nuclearExcitationCount = 0; |
---|
215 | G4int extraNucleonCount = 0; |
---|
216 | G4double extraNucleonMass = 0.0; |
---|
217 | if( nuclearExcitationCount > 0 ) |
---|
218 | { |
---|
219 | const G4double nucsup[] = { 1.00, 0.7, 0.5, 0.4, 0.35, 0.3 }; |
---|
220 | const G4double psup[] = { 3., 6., 20., 50., 100., 1000. }; |
---|
221 | G4int momentumBin = 0; |
---|
222 | while( (momentumBin < 6) && |
---|
223 | (modifiedOriginal.GetTotalMomentum()/GeV > psup[momentumBin]) ) |
---|
224 | ++momentumBin; |
---|
225 | momentumBin = std::min( 5, momentumBin ); |
---|
226 | // |
---|
227 | // NOTE: in GENXPT, these new particles were given negative codes |
---|
228 | // here I use NewlyAdded = true instead |
---|
229 | // |
---|
230 | |
---|
231 | for( i=0; i<nuclearExcitationCount; ++i ) |
---|
232 | { |
---|
233 | G4ReactionProduct * pVec = new G4ReactionProduct(); |
---|
234 | if( G4UniformRand() < nucsup[momentumBin] ) |
---|
235 | { |
---|
236 | if( G4UniformRand() > 1.0-atomicNumber/atomicWeight ) |
---|
237 | pVec->SetDefinition( aProton ); |
---|
238 | else |
---|
239 | pVec->SetDefinition( aNeutron ); |
---|
240 | pVec->SetSide( -2 ); // -2 means backside nucleon |
---|
241 | ++extraNucleonCount; |
---|
242 | backwardEnergy += pVec->GetMass()/GeV; |
---|
243 | extraNucleonMass += pVec->GetMass()/GeV; |
---|
244 | } |
---|
245 | else |
---|
246 | { |
---|
247 | G4double ran = G4UniformRand(); |
---|
248 | if( ran < 0.3181 ) |
---|
249 | pVec->SetDefinition( aPiPlus ); |
---|
250 | else if( ran < 0.6819 ) |
---|
251 | pVec->SetDefinition( aPiZero ); |
---|
252 | else |
---|
253 | pVec->SetDefinition( aPiMinus ); |
---|
254 | pVec->SetSide( -1 ); // backside particle, but not a nucleon |
---|
255 | } |
---|
256 | pVec->SetNewlyAdded( true ); // true is the same as IPA(i)<0 |
---|
257 | vec.SetElement( vecLen++, pVec ); |
---|
258 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
259 | backwardEnergy -= pVec->GetMass()/GeV; |
---|
260 | ++backwardCount; |
---|
261 | } |
---|
262 | } |
---|
263 | // |
---|
264 | // assume conservation of kinetic energy in forward & backward hemispheres |
---|
265 | // |
---|
266 | G4int is, iskip; |
---|
267 | while( forwardEnergy <= 0.0 ) // must eliminate a particle from the forward side |
---|
268 | { |
---|
269 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
270 | iskip = G4int(G4UniformRand()*forwardCount) + 1; // 1 <= iskip <= forwardCount |
---|
271 | is = 0; |
---|
272 | G4int forwardParticlesLeft = 0; |
---|
273 | for( i=(vecLen-1); i>=0; --i ) |
---|
274 | { |
---|
275 | if( vec[i]->GetSide() == 1 && vec[i]->GetMayBeKilled()) |
---|
276 | { |
---|
277 | forwardParticlesLeft = 1; |
---|
278 | if( ++is == iskip ) |
---|
279 | { |
---|
280 | forwardEnergy += vec[i]->GetMass()/GeV; |
---|
281 | for( G4int j=i; j<(vecLen-1); j++ )*vec[j] = *vec[j+1]; // shift up |
---|
282 | --forwardCount; |
---|
283 | delete vec[vecLen-1]; |
---|
284 | if( --vecLen == 0 )return false; // all the secondaries have been eliminated |
---|
285 | break; // --+ |
---|
286 | } // | |
---|
287 | } // | |
---|
288 | } // break goes down to here |
---|
289 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
290 | if( forwardParticlesLeft == 0 ) |
---|
291 | { |
---|
292 | G4int iremove = -1; |
---|
293 | for (G4int i = 0; i < vecLen; i++) { |
---|
294 | if (vec[i]->GetDefinition()->GetParticleSubType() == "pi") { |
---|
295 | iremove = i; |
---|
296 | break; |
---|
297 | } |
---|
298 | } |
---|
299 | if (iremove == -1) { |
---|
300 | for (G4int i = 0; i < vecLen; i++) { |
---|
301 | if (vec[i]->GetDefinition()->GetParticleSubType() == "kaon") { |
---|
302 | iremove = i; |
---|
303 | break; |
---|
304 | } |
---|
305 | } |
---|
306 | } |
---|
307 | if (iremove == -1) iremove = 0; |
---|
308 | |
---|
309 | forwardEnergy += vec[iremove]->GetMass()/GeV; |
---|
310 | if (vec[iremove]->GetSide() > 0) --forwardCount; |
---|
311 | |
---|
312 | for (G4int i = iremove; i < vecLen-1; i++) *vec[i] = *vec[i+1]; |
---|
313 | delete vec[vecLen-1]; |
---|
314 | vecLen--; |
---|
315 | if (vecLen == 0) return false; // all secondaries have been eliminated |
---|
316 | break; |
---|
317 | } |
---|
318 | } // while |
---|
319 | |
---|
320 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
321 | while( backwardEnergy <= 0.0 ) // must eliminate a particle from the backward side |
---|
322 | { |
---|
323 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
324 | iskip = G4int(G4UniformRand()*backwardCount) + 1; // 1 <= iskip <= backwardCount |
---|
325 | is = 0; |
---|
326 | G4int backwardParticlesLeft = 0; |
---|
327 | for( i=(vecLen-1); i>=0; --i ) |
---|
328 | { |
---|
329 | if( vec[i]->GetSide() < 0 && vec[i]->GetMayBeKilled()) |
---|
330 | { |
---|
331 | backwardParticlesLeft = 1; |
---|
332 | if( ++is == iskip ) // eliminate the i'th particle |
---|
333 | { |
---|
334 | if( vec[i]->GetSide() == -2 ) |
---|
335 | { |
---|
336 | --extraNucleonCount; |
---|
337 | extraNucleonMass -= vec[i]->GetMass()/GeV; |
---|
338 | backwardEnergy -= vec[i]->GetTotalEnergy()/GeV; |
---|
339 | } |
---|
340 | backwardEnergy += vec[i]->GetTotalEnergy()/GeV; |
---|
341 | for( G4int j=i; j<(vecLen-1); ++j )*vec[j] = *vec[j+1]; // shift up |
---|
342 | --backwardCount; |
---|
343 | delete vec[vecLen-1]; |
---|
344 | if( --vecLen == 0 )return false; // all the secondaries have been eliminated |
---|
345 | break; |
---|
346 | } |
---|
347 | } |
---|
348 | } |
---|
349 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
350 | if( backwardParticlesLeft == 0 ) |
---|
351 | { |
---|
352 | G4int iremove = -1; |
---|
353 | for (G4int i = 0; i < vecLen; i++) { |
---|
354 | if (vec[i]->GetDefinition()->GetParticleSubType() == "pi") { |
---|
355 | iremove = i; |
---|
356 | break; |
---|
357 | } |
---|
358 | } |
---|
359 | if (iremove == -1) { |
---|
360 | for (G4int i = 0; i < vecLen; i++) { |
---|
361 | if (vec[i]->GetDefinition()->GetParticleSubType() == "kaon") { |
---|
362 | iremove = i; |
---|
363 | break; |
---|
364 | } |
---|
365 | } |
---|
366 | } |
---|
367 | if (iremove == -1) iremove = 0; |
---|
368 | |
---|
369 | backwardEnergy += vec[iremove]->GetMass()/GeV; |
---|
370 | if (vec[iremove]->GetSide() > 0) --backwardCount; |
---|
371 | |
---|
372 | for (G4int i = iremove; i < vecLen-1; i++) *vec[i] = *vec[i+1]; |
---|
373 | delete vec[vecLen-1]; |
---|
374 | vecLen--; |
---|
375 | if (vecLen == 0) return false; // all secondaries have been eliminated |
---|
376 | break; |
---|
377 | } |
---|
378 | } // while |
---|
379 | |
---|
380 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
381 | // |
---|
382 | // define initial state vectors for Lorentz transformations |
---|
383 | // the pseudoParticles have non-standard masses, hence the "pseudo" |
---|
384 | // |
---|
385 | G4ReactionProduct pseudoParticle[8]; |
---|
386 | for( i=0; i<8; ++i )pseudoParticle[i].SetZero(); |
---|
387 | |
---|
388 | pseudoParticle[0].SetMass( mOriginal*GeV ); |
---|
389 | pseudoParticle[0].SetMomentum( 0.0, 0.0, pOriginal*GeV ); |
---|
390 | pseudoParticle[0].SetTotalEnergy( |
---|
391 | std::sqrt( pOriginal*pOriginal + mOriginal*mOriginal )*GeV ); |
---|
392 | |
---|
393 | pseudoParticle[1].SetMass( protonMass*MeV ); // this could be targetMass |
---|
394 | pseudoParticle[1].SetTotalEnergy( protonMass*MeV ); |
---|
395 | |
---|
396 | pseudoParticle[3].SetMass( protonMass*(1+extraNucleonCount)*MeV ); |
---|
397 | pseudoParticle[3].SetTotalEnergy( protonMass*(1+extraNucleonCount)*MeV ); |
---|
398 | |
---|
399 | pseudoParticle[2] = pseudoParticle[0] + pseudoParticle[1]; |
---|
400 | pseudoParticle[3] = pseudoParticle[3] + pseudoParticle[0]; |
---|
401 | |
---|
402 | pseudoParticle[0].Lorentz( pseudoParticle[0], pseudoParticle[2] ); |
---|
403 | pseudoParticle[1].Lorentz( pseudoParticle[1], pseudoParticle[2] ); |
---|
404 | |
---|
405 | // |
---|
406 | // main loop for 4-momentum generation |
---|
407 | // see Pitha-report (Aachen) for a detailed description of the method |
---|
408 | // |
---|
409 | G4double aspar, pt, et, x, pp, pp1, wgt; |
---|
410 | G4int innerCounter, outerCounter; |
---|
411 | G4bool eliminateThisParticle, resetEnergies, constantCrossSection; |
---|
412 | |
---|
413 | G4double forwardKinetic = 0.0, backwardKinetic = 0.0; |
---|
414 | // |
---|
415 | // process the secondary particles in reverse order |
---|
416 | // the incident particle is Done after the secondaries |
---|
417 | // nucleons, including the target, in the backward hemisphere are also Done later |
---|
418 | // |
---|
419 | G4int backwardNucleonCount = 0; // number of nucleons in backward hemisphere |
---|
420 | G4double totalEnergy, kineticEnergy, vecMass; |
---|
421 | |
---|
422 | for( i=(vecLen-1); i>=0; --i ) |
---|
423 | { |
---|
424 | G4double phi = G4UniformRand()*twopi; |
---|
425 | if( vec[i]->GetNewlyAdded() ) // added from intranuclear cascade |
---|
426 | { |
---|
427 | if( vec[i]->GetSide() == -2 ) // is a nucleon |
---|
428 | { |
---|
429 | if( backwardNucleonCount < 18 ) |
---|
430 | { |
---|
431 | if (vec[i]->GetDefinition()->GetParticleSubType() == "pi") { |
---|
432 | for(G4int i=0; i<vecLen; i++) delete vec[i]; |
---|
433 | vecLen = 0; |
---|
434 | throw G4HadReentrentException(__FILE__, __LINE__, |
---|
435 | "G4RPGFragmentation::ReactionStage : a pion has been counted as a backward nucleon"); |
---|
436 | } |
---|
437 | vec[i]->SetSide( -3 ); |
---|
438 | ++backwardNucleonCount; |
---|
439 | continue; |
---|
440 | } |
---|
441 | } |
---|
442 | } |
---|
443 | // |
---|
444 | // set pt and phi values, they are changed somewhat in the iteration loop |
---|
445 | // set mass parameter for lambda fragmentation model |
---|
446 | // |
---|
447 | vecMass = vec[i]->GetMass()/GeV; |
---|
448 | G4double ran = -std::log(1.0-G4UniformRand())/3.5; |
---|
449 | if( vec[i]->GetSide() == -2 ) // backward nucleon |
---|
450 | { |
---|
451 | if (vec[i]->GetDefinition()->GetParticleSubType() == "kaon" || |
---|
452 | vec[i]->GetDefinition()->GetParticleSubType() == "pi") { |
---|
453 | aspar = 0.75; |
---|
454 | pt = std::sqrt( std::pow( ran, 1.7 ) ); |
---|
455 | } else { // vec[i] must be a proton, neutron, |
---|
456 | aspar = 0.20; // lambda, sigma, xsi, or ion |
---|
457 | pt = std::sqrt( std::pow( ran, 1.2 ) ); |
---|
458 | } |
---|
459 | |
---|
460 | } else { // not a backward nucleon |
---|
461 | |
---|
462 | if (vec[i]->GetDefinition()->GetParticleSubType() == "pi") { |
---|
463 | aspar = 0.75; |
---|
464 | pt = std::sqrt( std::pow( ran, 1.7 ) ); |
---|
465 | } else if (vec[i]->GetDefinition()->GetParticleSubType() == "kaon") { |
---|
466 | aspar = 0.70; |
---|
467 | pt = std::sqrt( std::pow( ran, 1.7 ) ); |
---|
468 | } else { // vec[i] must be a proton, neutron, |
---|
469 | aspar = 0.65; // lambda, sigma, xsi, or ion |
---|
470 | pt = std::sqrt( std::pow( ran, 1.5 ) ); |
---|
471 | } |
---|
472 | } |
---|
473 | pt = std::max( 0.001, pt ); |
---|
474 | vec[i]->SetMomentum( pt*std::cos(phi)*GeV, pt*std::sin(phi)*GeV ); |
---|
475 | if( vec[i]->GetSide() > 0 ) |
---|
476 | et = pseudoParticle[0].GetTotalEnergy()/GeV; |
---|
477 | else |
---|
478 | et = pseudoParticle[1].GetTotalEnergy()/GeV; |
---|
479 | |
---|
480 | // |
---|
481 | // start of outer iteration loop |
---|
482 | // |
---|
483 | outerCounter = 0; |
---|
484 | eliminateThisParticle = true; |
---|
485 | resetEnergies = true; |
---|
486 | dndl[0] = 0.0; |
---|
487 | |
---|
488 | while( ++outerCounter < 3 ) |
---|
489 | { |
---|
490 | FragmentationIntegral(pt, et, aspar, vecMass); |
---|
491 | |
---|
492 | innerCounter = 0; |
---|
493 | vec[i]->SetMomentum( pt*std::cos(phi)*GeV, pt*std::sin(phi)*GeV ); |
---|
494 | // |
---|
495 | // start of inner iteration loop |
---|
496 | // |
---|
497 | while( ++innerCounter < 7 ) |
---|
498 | { |
---|
499 | ran = G4UniformRand()*dndl[19]; |
---|
500 | l = 1; |
---|
501 | while( ( ran > dndl[l] ) && ( l < 19 ) ) l++; |
---|
502 | x = (G4double(l-1) + G4UniformRand())/19.; |
---|
503 | if( vec[i]->GetSide() < 0 )x *= -1.; |
---|
504 | vec[i]->SetMomentum( x*et*GeV ); // set the z-momentum |
---|
505 | totalEnergy = std::sqrt( x*et*x*et + pt*pt + vecMass*vecMass ); |
---|
506 | vec[i]->SetTotalEnergy( totalEnergy*GeV ); |
---|
507 | kineticEnergy = vec[i]->GetKineticEnergy()/GeV; |
---|
508 | if( vec[i]->GetSide() > 0 ) // forward side |
---|
509 | { |
---|
510 | if( (forwardKinetic+kineticEnergy) < 0.95*forwardEnergy ) |
---|
511 | { |
---|
512 | pseudoParticle[4] = pseudoParticle[4] + (*vec[i]); |
---|
513 | forwardKinetic += kineticEnergy; |
---|
514 | outerCounter = 2; // leave outer loop |
---|
515 | eliminateThisParticle = false; // don't eliminate this particle |
---|
516 | resetEnergies = false; |
---|
517 | break; // leave inner loop |
---|
518 | } |
---|
519 | if( innerCounter > 5 )break; // leave inner loop |
---|
520 | if( backwardEnergy >= vecMass ) // switch sides |
---|
521 | { |
---|
522 | vec[i]->SetSide( -1 ); |
---|
523 | forwardEnergy += vecMass; |
---|
524 | backwardEnergy -= vecMass; |
---|
525 | ++backwardCount; |
---|
526 | } |
---|
527 | } else { // backward side |
---|
528 | if( extraNucleonCount > 19 ) // commented out to duplicate ?bug? in GENXPT |
---|
529 | x = 0.999; |
---|
530 | G4double xxx = 0.95+0.05*extraNucleonCount/20.0; |
---|
531 | if( (backwardKinetic+kineticEnergy) < xxx*backwardEnergy ) |
---|
532 | { |
---|
533 | pseudoParticle[5] = pseudoParticle[5] + (*vec[i]); |
---|
534 | backwardKinetic += kineticEnergy; |
---|
535 | outerCounter = 2; // leave outer loop |
---|
536 | eliminateThisParticle = false; // don't eliminate this particle |
---|
537 | resetEnergies = false; |
---|
538 | break; // leave inner loop |
---|
539 | } |
---|
540 | if( innerCounter > 5 )break; // leave inner loop |
---|
541 | if( forwardEnergy >= vecMass ) // switch sides |
---|
542 | { |
---|
543 | vec[i]->SetSide( 1 ); |
---|
544 | forwardEnergy -= vecMass; |
---|
545 | backwardEnergy += vecMass; |
---|
546 | backwardCount--; |
---|
547 | } |
---|
548 | } |
---|
549 | G4ThreeVector momentum = vec[i]->GetMomentum(); |
---|
550 | vec[i]->SetMomentum( momentum.x() * 0.9, momentum.y() * 0.9 ); |
---|
551 | pt *= 0.9; |
---|
552 | dndl[19] *= 0.9; |
---|
553 | } // closes inner loop |
---|
554 | if( resetEnergies ) { |
---|
555 | // If we get to here, the inner loop has been done 6 times. |
---|
556 | // Reset the kinetic energies of previously done particles, if |
---|
557 | // they are lighter than protons and in the forward hemisphere, |
---|
558 | // then continue with outer loop. |
---|
559 | // |
---|
560 | forwardKinetic = 0.0; |
---|
561 | backwardKinetic = 0.0; |
---|
562 | pseudoParticle[4].SetZero(); |
---|
563 | pseudoParticle[5].SetZero(); |
---|
564 | for( l=i+1; l<vecLen; ++l ) { |
---|
565 | if (vec[l]->GetSide() > 0 || |
---|
566 | vec[l]->GetDefinition()->GetParticleSubType() == "kaon" || |
---|
567 | vec[l]->GetDefinition()->GetParticleSubType() == "pi") { |
---|
568 | |
---|
569 | G4double tempMass = vec[l]->GetMass()/MeV; |
---|
570 | totalEnergy = 0.95*vec[l]->GetTotalEnergy()/MeV + 0.05*tempMass; |
---|
571 | totalEnergy = std::max( tempMass, totalEnergy ); |
---|
572 | vec[l]->SetTotalEnergy( totalEnergy*MeV ); |
---|
573 | pp = std::sqrt( std::abs( totalEnergy*totalEnergy - tempMass*tempMass ) ); |
---|
574 | pp1 = vec[l]->GetMomentum().mag()/MeV; |
---|
575 | if( pp1 < 1.0e-6*GeV ) { |
---|
576 | G4ThreeVector iso = Isotropic(pp); |
---|
577 | vec[l]->SetMomentum( iso.x(), iso.y(), iso.z() ); |
---|
578 | } else { |
---|
579 | vec[l]->SetMomentum( vec[l]->GetMomentum() * (pp/pp1) ); |
---|
580 | } |
---|
581 | G4double px = vec[l]->GetMomentum().x()/MeV; |
---|
582 | G4double py = vec[l]->GetMomentum().y()/MeV; |
---|
583 | pt = std::max( 1.0, std::sqrt( px*px + py*py ) )/GeV; |
---|
584 | if( vec[l]->GetSide() > 0 ) |
---|
585 | { |
---|
586 | forwardKinetic += vec[l]->GetKineticEnergy()/GeV; |
---|
587 | pseudoParticle[4] = pseudoParticle[4] + (*vec[l]); |
---|
588 | } else { |
---|
589 | backwardKinetic += vec[l]->GetKineticEnergy()/GeV; |
---|
590 | pseudoParticle[5] = pseudoParticle[5] + (*vec[l]); |
---|
591 | } |
---|
592 | } // if pi, K or forward |
---|
593 | } // for l |
---|
594 | } // if resetEnergies |
---|
595 | } // closes outer loop |
---|
596 | |
---|
597 | if( eliminateThisParticle && vec[i]->GetMayBeKilled()) // not enough energy, eliminate this particle |
---|
598 | { |
---|
599 | if( vec[i]->GetSide() > 0 ) |
---|
600 | { |
---|
601 | --forwardCount; |
---|
602 | forwardEnergy += vecMass; |
---|
603 | } else { |
---|
604 | if( vec[i]->GetSide() == -2 ) |
---|
605 | { |
---|
606 | --extraNucleonCount; |
---|
607 | extraNucleonMass -= vecMass; |
---|
608 | backwardEnergy -= vecMass; |
---|
609 | } |
---|
610 | --backwardCount; |
---|
611 | backwardEnergy += vecMass; |
---|
612 | } |
---|
613 | for( G4int j=i; j<(vecLen-1); ++j )*vec[j] = *vec[j+1]; // shift up |
---|
614 | G4ReactionProduct *temp = vec[vecLen-1]; |
---|
615 | delete temp; |
---|
616 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
617 | if( --vecLen == 0 )return false; // all the secondaries have been eliminated |
---|
618 | } |
---|
619 | } // closes main for loop |
---|
620 | |
---|
621 | // |
---|
622 | // for the incident particle: it was placed in the forward hemisphere |
---|
623 | // set pt and phi values, they are changed somewhat in the iteration loop |
---|
624 | // set mass parameter for lambda fragmentation model |
---|
625 | // |
---|
626 | G4double phi = G4UniformRand()*twopi; |
---|
627 | G4double ran = -std::log(1.0-G4UniformRand()); |
---|
628 | if (currentParticle.GetDefinition()->GetParticleSubType() == "pi") { |
---|
629 | aspar = 0.60; |
---|
630 | pt = std::sqrt( std::pow( ran/6.0, 1.7 ) ); |
---|
631 | } else if (currentParticle.GetDefinition()->GetParticleSubType() == "kaon") { |
---|
632 | aspar = 0.50; |
---|
633 | pt = std::sqrt( std::pow( ran/5.0, 1.4 ) ); |
---|
634 | } else { |
---|
635 | aspar = 0.40; |
---|
636 | pt = std::sqrt( std::pow( ran/4.0, 1.2 ) ); |
---|
637 | } |
---|
638 | |
---|
639 | currentParticle.SetMomentum( pt*std::cos(phi)*GeV, pt*std::sin(phi)*GeV ); |
---|
640 | et = pseudoParticle[0].GetTotalEnergy()/GeV; |
---|
641 | dndl[0] = 0.0; |
---|
642 | vecMass = currentParticle.GetMass()/GeV; |
---|
643 | |
---|
644 | FragmentationIntegral(pt, et, aspar, vecMass); |
---|
645 | |
---|
646 | ran = G4UniformRand()*dndl[19]; |
---|
647 | l = 1; |
---|
648 | while( ( ran > dndl[l] ) && ( l < 19 ) ) l++; |
---|
649 | x = (G4double(l-1) + G4UniformRand())/19.; |
---|
650 | currentParticle.SetMomentum( x*et*GeV ); // set the z-momentum |
---|
651 | if( forwardEnergy < forwardKinetic ) |
---|
652 | totalEnergy = vecMass + 0.04*std::fabs(normal()); |
---|
653 | else |
---|
654 | totalEnergy = vecMass + forwardEnergy - forwardKinetic; |
---|
655 | currentParticle.SetTotalEnergy( totalEnergy*GeV ); |
---|
656 | pp = std::sqrt( std::abs( totalEnergy*totalEnergy - vecMass*vecMass ) )*GeV; |
---|
657 | pp1 = currentParticle.GetMomentum().mag()/MeV; |
---|
658 | |
---|
659 | if( pp1 < 1.0e-6*GeV ) { |
---|
660 | G4ThreeVector iso = Isotropic(pp); |
---|
661 | currentParticle.SetMomentum( iso.x(), iso.y(), iso.z() ); |
---|
662 | } else { |
---|
663 | currentParticle.SetMomentum( currentParticle.GetMomentum() * (pp/pp1) ); |
---|
664 | } |
---|
665 | pseudoParticle[4] = pseudoParticle[4] + currentParticle; |
---|
666 | |
---|
667 | // |
---|
668 | // Current particle now finished |
---|
669 | // |
---|
670 | // Begin target particle |
---|
671 | // |
---|
672 | |
---|
673 | if( backwardNucleonCount < 18 ) |
---|
674 | { |
---|
675 | targetParticle.SetSide( -3 ); |
---|
676 | ++backwardNucleonCount; |
---|
677 | } |
---|
678 | else |
---|
679 | { |
---|
680 | // set pt and phi values, they are changed somewhat in the iteration loop |
---|
681 | // set mass parameter for lambda fragmentation model |
---|
682 | // |
---|
683 | vecMass = targetParticle.GetMass()/GeV; |
---|
684 | ran = -std::log(1.0-G4UniformRand()); |
---|
685 | aspar = 0.40; |
---|
686 | pt = std::max( 0.001, std::sqrt( std::pow( ran/4.0, 1.2 ) ) ); |
---|
687 | targetParticle.SetMomentum( pt*std::cos(phi)*GeV, pt*std::sin(phi)*GeV ); |
---|
688 | et = pseudoParticle[1].GetTotalEnergy()/GeV; |
---|
689 | outerCounter = 0; |
---|
690 | eliminateThisParticle = true; // should never eliminate the target particle |
---|
691 | resetEnergies = true; |
---|
692 | dndl[0] = 0.0; |
---|
693 | |
---|
694 | while( ++outerCounter < 3 ) // start of outer iteration loop |
---|
695 | { |
---|
696 | FragmentationIntegral(pt, et, aspar, vecMass); |
---|
697 | |
---|
698 | innerCounter = 0; |
---|
699 | while( ++innerCounter < 7 ) // start of inner iteration loop |
---|
700 | { |
---|
701 | ran = G4UniformRand()*dndl[19]; |
---|
702 | l = 1; |
---|
703 | while( ( ran > dndl[l] ) && ( l < 19 ) ) l++; |
---|
704 | x = (G4double(l-1) + G4UniformRand())/19.; |
---|
705 | if( targetParticle.GetSide() < 0 )x *= -1.; |
---|
706 | targetParticle.SetMomentum( x*et*GeV ); // set the z-momentum |
---|
707 | totalEnergy = std::sqrt( x*et*x*et + pt*pt + vecMass*vecMass ); |
---|
708 | targetParticle.SetTotalEnergy( totalEnergy*GeV ); |
---|
709 | if( targetParticle.GetSide() < 0 ) |
---|
710 | { |
---|
711 | if( extraNucleonCount > 19 )x=0.999; |
---|
712 | G4double xxx = 0.95+0.05*extraNucleonCount/20.0; |
---|
713 | if( (backwardKinetic+totalEnergy-vecMass) < xxx*backwardEnergy ) |
---|
714 | { |
---|
715 | pseudoParticle[5] = pseudoParticle[5] + targetParticle; |
---|
716 | backwardKinetic += totalEnergy - vecMass; |
---|
717 | // pseudoParticle[6] = pseudoParticle[4] + pseudoParticle[5]; |
---|
718 | // pseudoParticle[6].SetMomentum( 0.0 ); // set z-momentum |
---|
719 | outerCounter = 2; // leave outer loop |
---|
720 | eliminateThisParticle = false; // don't eliminate this particle |
---|
721 | resetEnergies = false; |
---|
722 | break; // leave inner loop |
---|
723 | } |
---|
724 | if( innerCounter > 5 )break; // leave inner loop |
---|
725 | if( forwardEnergy >= vecMass ) // switch sides |
---|
726 | { |
---|
727 | targetParticle.SetSide( 1 ); |
---|
728 | forwardEnergy -= vecMass; |
---|
729 | backwardEnergy += vecMass; |
---|
730 | --backwardCount; |
---|
731 | } |
---|
732 | G4ThreeVector momentum = targetParticle.GetMomentum(); |
---|
733 | targetParticle.SetMomentum( momentum.x() * 0.9, momentum.y() * 0.9 ); |
---|
734 | pt *= 0.9; |
---|
735 | dndl[19] *= 0.9; |
---|
736 | } |
---|
737 | else // target has gone to forward side |
---|
738 | { |
---|
739 | if( forwardEnergy < forwardKinetic ) |
---|
740 | totalEnergy = vecMass + 0.04*std::fabs(normal()); |
---|
741 | else |
---|
742 | totalEnergy = vecMass + forwardEnergy - forwardKinetic; |
---|
743 | targetParticle.SetTotalEnergy( totalEnergy*GeV ); |
---|
744 | pp = std::sqrt( std::abs( totalEnergy*totalEnergy - vecMass*vecMass ) )*GeV; |
---|
745 | pp1 = targetParticle.GetMomentum().mag()/MeV; |
---|
746 | if( pp1 < 1.0e-6*GeV ) { |
---|
747 | G4ThreeVector iso = Isotropic(pp); |
---|
748 | targetParticle.SetMomentum( iso.x(), iso.y(), iso.z() ); |
---|
749 | } else { |
---|
750 | targetParticle.SetMomentum( targetParticle.GetMomentum() * (pp/pp1) ); |
---|
751 | } |
---|
752 | |
---|
753 | pseudoParticle[4] = pseudoParticle[4] + targetParticle; |
---|
754 | outerCounter = 2; // leave outer loop |
---|
755 | eliminateThisParticle = false; // don't eliminate this particle |
---|
756 | resetEnergies = false; |
---|
757 | break; // leave inner loop |
---|
758 | } |
---|
759 | } // closes inner loop |
---|
760 | |
---|
761 | if( resetEnergies ) { |
---|
762 | // If we get to here, the inner loop has been done 6 times. |
---|
763 | // Reset the kinetic energies of previously done particles, |
---|
764 | // if they are lighter than protons and in the forward hemisphere, |
---|
765 | // then continue with outer loop. |
---|
766 | |
---|
767 | forwardKinetic = backwardKinetic = 0.0; |
---|
768 | pseudoParticle[4].SetZero(); |
---|
769 | pseudoParticle[5].SetZero(); |
---|
770 | for( l=0; l<vecLen; ++l ) { |
---|
771 | if (vec[l]->GetSide() > 0 || |
---|
772 | vec[l]->GetDefinition()->GetParticleSubType() == "kaon" || |
---|
773 | vec[l]->GetDefinition()->GetParticleSubType() == "pi") { |
---|
774 | G4double tempMass = vec[l]->GetMass()/GeV; |
---|
775 | totalEnergy = |
---|
776 | std::max( tempMass, 0.95*vec[l]->GetTotalEnergy()/GeV + 0.05*tempMass ); |
---|
777 | vec[l]->SetTotalEnergy( totalEnergy*GeV ); |
---|
778 | pp = std::sqrt( std::abs( totalEnergy*totalEnergy - tempMass*tempMass ) )*GeV; |
---|
779 | pp1 = vec[l]->GetMomentum().mag()/MeV; |
---|
780 | if( pp1 < 1.0e-6*GeV ) { |
---|
781 | G4ThreeVector iso = Isotropic(pp); |
---|
782 | vec[l]->SetMomentum( iso.x(), iso.y(), iso.z() ); |
---|
783 | } else { |
---|
784 | vec[l]->SetMomentum( vec[l]->GetMomentum() * (pp/pp1) ); |
---|
785 | } |
---|
786 | pt = std::max( 0.001*GeV, std::sqrt( sqr(vec[l]->GetMomentum().x()/MeV) + |
---|
787 | sqr(vec[l]->GetMomentum().y()/MeV) ) )/GeV; |
---|
788 | if( vec[l]->GetSide() > 0) |
---|
789 | { |
---|
790 | forwardKinetic += vec[l]->GetKineticEnergy()/GeV; |
---|
791 | pseudoParticle[4] = pseudoParticle[4] + (*vec[l]); |
---|
792 | } else { |
---|
793 | backwardKinetic += vec[l]->GetKineticEnergy()/GeV; |
---|
794 | pseudoParticle[5] = pseudoParticle[5] + (*vec[l]); |
---|
795 | } |
---|
796 | } // if pi, K or forward |
---|
797 | } // for l |
---|
798 | } // if (resetEnergies) |
---|
799 | } // closes outer loop |
---|
800 | |
---|
801 | // if( eliminateThisParticle ) // not enough energy, eliminate target |
---|
802 | // { |
---|
803 | // G4cerr << "Warning: eliminating target particle" << G4endl; |
---|
804 | // exit( EXIT_FAILURE ); |
---|
805 | // } |
---|
806 | } |
---|
807 | // |
---|
808 | // Target particle finished. |
---|
809 | // |
---|
810 | // Now produce backward nucleons with a cluster model |
---|
811 | // |
---|
812 | pseudoParticle[6].Lorentz( pseudoParticle[3], pseudoParticle[2] ); |
---|
813 | pseudoParticle[6] = pseudoParticle[6] - pseudoParticle[4]; |
---|
814 | pseudoParticle[6] = pseudoParticle[6] - pseudoParticle[5]; |
---|
815 | if( backwardNucleonCount == 1 ) // target particle is the only backward nucleon |
---|
816 | { |
---|
817 | G4double ekin = |
---|
818 | std::min( backwardEnergy-backwardKinetic, centerofmassEnergy/2.0-protonMass/GeV ); |
---|
819 | |
---|
820 | if( ekin < 0.04 )ekin = 0.04 * std::fabs( normal() ); |
---|
821 | vecMass = targetParticle.GetMass()/GeV; |
---|
822 | totalEnergy = ekin+vecMass; |
---|
823 | targetParticle.SetTotalEnergy( totalEnergy*GeV ); |
---|
824 | pp = std::sqrt( std::abs( totalEnergy*totalEnergy - vecMass*vecMass ) )*GeV; |
---|
825 | pp1 = pseudoParticle[6].GetMomentum().mag()/MeV; |
---|
826 | if( pp1 < 1.0e-6*GeV ) { |
---|
827 | G4ThreeVector iso = Isotropic(pp); |
---|
828 | targetParticle.SetMomentum( iso.x(), iso.y(), iso.z() ); |
---|
829 | } else { |
---|
830 | targetParticle.SetMomentum( pseudoParticle[6].GetMomentum() * (pp/pp1) ); |
---|
831 | } |
---|
832 | pseudoParticle[5] = pseudoParticle[5] + targetParticle; |
---|
833 | } |
---|
834 | else if (backwardNucleonCount > 1) |
---|
835 | { |
---|
836 | const G4double cpar[] = { 1.60, 1.35, 1.15, 1.10 }; |
---|
837 | const G4double gpar[] = { 2.60, 1.80, 1.30, 1.20 }; |
---|
838 | |
---|
839 | G4int tempCount = 5; |
---|
840 | if (backwardNucleonCount < 5) tempCount = backwardNucleonCount; |
---|
841 | tempCount -= 2; |
---|
842 | |
---|
843 | G4double rmb = 0.; |
---|
844 | if( targetParticle.GetSide() == -3 ) rmb += targetParticle.GetMass()/GeV; |
---|
845 | for( i=0; i<vecLen; ++i ) |
---|
846 | { |
---|
847 | if( vec[i]->GetSide() == -3 ) rmb += vec[i]->GetMass()/GeV; |
---|
848 | } |
---|
849 | rmb += std::pow(-std::log(1.0-G4UniformRand()),1./cpar[tempCount]) / gpar[tempCount]; |
---|
850 | totalEnergy = pseudoParticle[6].GetTotalEnergy()/GeV; |
---|
851 | vecMass = std::min( rmb, totalEnergy ); |
---|
852 | pseudoParticle[6].SetMass( vecMass*GeV ); |
---|
853 | pp = std::sqrt( std::abs( totalEnergy*totalEnergy - vecMass*vecMass ) )*GeV; |
---|
854 | pp1 = pseudoParticle[6].GetMomentum().mag()/MeV; |
---|
855 | if( pp1 < 1.0e-6*GeV ) { |
---|
856 | G4ThreeVector iso = Isotropic(pp); |
---|
857 | pseudoParticle[6].SetMomentum( iso.x(), iso.y(), iso.z() ); |
---|
858 | } else { |
---|
859 | pseudoParticle[6].SetMomentum( pseudoParticle[6].GetMomentum() * (-pp/pp1) ); |
---|
860 | } |
---|
861 | G4FastVector<G4ReactionProduct,256> tempV; // tempV contains the backward nucleons |
---|
862 | tempV.Initialize( backwardNucleonCount ); |
---|
863 | G4int tempLen = 0; |
---|
864 | if( targetParticle.GetSide() == -3 )tempV.SetElement( tempLen++, &targetParticle ); |
---|
865 | for( i=0; i<vecLen; ++i ) |
---|
866 | { |
---|
867 | if( vec[i]->GetSide() == -3 )tempV.SetElement( tempLen++, vec[i] ); |
---|
868 | } |
---|
869 | if( tempLen != backwardNucleonCount ) |
---|
870 | { |
---|
871 | G4cerr << "tempLen is not the same as backwardNucleonCount" << G4endl; |
---|
872 | G4cerr << "tempLen = " << tempLen; |
---|
873 | G4cerr << ", backwardNucleonCount = " << backwardNucleonCount << G4endl; |
---|
874 | G4cerr << "targetParticle side = " << targetParticle.GetSide() << G4endl; |
---|
875 | G4cerr << "currentParticle side = " << currentParticle.GetSide() << G4endl; |
---|
876 | for( i=0; i<vecLen; ++i ) |
---|
877 | G4cerr << "particle #" << i << " side = " << vec[i]->GetSide() << G4endl; |
---|
878 | exit( EXIT_FAILURE ); |
---|
879 | } |
---|
880 | constantCrossSection = true; |
---|
881 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
882 | if( tempLen >= 2 ) |
---|
883 | { |
---|
884 | wgt = GenerateNBodyEvent( |
---|
885 | pseudoParticle[6].GetMass(), constantCrossSection, tempV, tempLen ); |
---|
886 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
887 | if( targetParticle.GetSide() == -3 ) |
---|
888 | { |
---|
889 | targetParticle.Lorentz( targetParticle, pseudoParticle[6] ); |
---|
890 | // tempV contains the real stuff |
---|
891 | pseudoParticle[5] = pseudoParticle[5] + targetParticle; |
---|
892 | } |
---|
893 | for( i=0; i<vecLen; ++i ) |
---|
894 | { |
---|
895 | if( vec[i]->GetSide() == -3 ) |
---|
896 | { |
---|
897 | vec[i]->Lorentz( *vec[i], pseudoParticle[6] ); |
---|
898 | pseudoParticle[5] = pseudoParticle[5] + (*vec[i]); |
---|
899 | } |
---|
900 | } |
---|
901 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
902 | } |
---|
903 | } |
---|
904 | else return false; |
---|
905 | |
---|
906 | // |
---|
907 | // Lorentz transformation in lab system |
---|
908 | // |
---|
909 | if( vecLen == 0 )return false; // all the secondaries have been eliminated |
---|
910 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
911 | |
---|
912 | currentParticle.Lorentz( currentParticle, pseudoParticle[1] ); |
---|
913 | targetParticle.Lorentz( targetParticle, pseudoParticle[1] ); |
---|
914 | for( i=0; i<vecLen; ++i ) vec[i]->Lorentz( *vec[i], pseudoParticle[1] ); |
---|
915 | |
---|
916 | // leadFlag will be true if original particle and incident particle are |
---|
917 | // both strange, in which case the incident particle becomes the leading |
---|
918 | // particle. |
---|
919 | // leadFlag will also be true if the target particle is strange, but the |
---|
920 | // incident particle is not, in which case the target particle becomes the |
---|
921 | // leading particle. |
---|
922 | |
---|
923 | G4bool leadingStrangeParticleHasChanged = true; |
---|
924 | if( leadFlag ) |
---|
925 | { |
---|
926 | if( currentParticle.GetDefinition() == leadingStrangeParticle.GetDefinition() ) |
---|
927 | leadingStrangeParticleHasChanged = false; |
---|
928 | if( leadingStrangeParticleHasChanged && |
---|
929 | ( targetParticle.GetDefinition() == leadingStrangeParticle.GetDefinition() ) ) |
---|
930 | leadingStrangeParticleHasChanged = false; |
---|
931 | if( leadingStrangeParticleHasChanged ) |
---|
932 | { |
---|
933 | for( i=0; i<vecLen; i++ ) |
---|
934 | { |
---|
935 | if( vec[i]->GetDefinition() == leadingStrangeParticle.GetDefinition() ) |
---|
936 | { |
---|
937 | leadingStrangeParticleHasChanged = false; |
---|
938 | break; |
---|
939 | } |
---|
940 | } |
---|
941 | } |
---|
942 | if( leadingStrangeParticleHasChanged ) |
---|
943 | { |
---|
944 | G4bool leadTest = |
---|
945 | (leadingStrangeParticle.GetDefinition()->GetParticleSubType() == "kaon" || |
---|
946 | leadingStrangeParticle.GetDefinition()->GetParticleSubType() == "pi"); |
---|
947 | G4bool targetTest = |
---|
948 | (targetParticle.GetDefinition()->GetParticleSubType() == "kaon" || |
---|
949 | targetParticle.GetDefinition()->GetParticleSubType() == "pi"); |
---|
950 | |
---|
951 | // following modified by JLC 22-Oct-97 |
---|
952 | |
---|
953 | if( (leadTest&&targetTest) || !(leadTest||targetTest) ) // both true or both false |
---|
954 | { |
---|
955 | targetParticle.SetDefinitionAndUpdateE( leadingStrangeParticle.GetDefinition() ); |
---|
956 | targetHasChanged = true; |
---|
957 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
958 | } |
---|
959 | else |
---|
960 | { |
---|
961 | currentParticle.SetDefinitionAndUpdateE( leadingStrangeParticle.GetDefinition() ); |
---|
962 | incidentHasChanged = false; |
---|
963 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
964 | } |
---|
965 | } |
---|
966 | } // end of if( leadFlag ) |
---|
967 | |
---|
968 | // Get number of final state nucleons and nucleons remaining in |
---|
969 | // target nucleus |
---|
970 | |
---|
971 | std::pair<G4int, G4int> finalStateNucleons = |
---|
972 | GetFinalStateNucleons(originalTarget, vec, vecLen); |
---|
973 | |
---|
974 | G4int protonsInFinalState = finalStateNucleons.first; |
---|
975 | G4int neutronsInFinalState = finalStateNucleons.second; |
---|
976 | |
---|
977 | G4int numberofFinalStateNucleons = |
---|
978 | protonsInFinalState + neutronsInFinalState; |
---|
979 | |
---|
980 | if (currentParticle.GetDefinition()->GetBaryonNumber() == 1 && |
---|
981 | targetParticle.GetDefinition()->GetBaryonNumber() == 1 && |
---|
982 | originalIncident->GetDefinition()->GetPDGMass() < |
---|
983 | G4Lambda::Lambda()->GetPDGMass()) |
---|
984 | numberofFinalStateNucleons++; |
---|
985 | |
---|
986 | numberofFinalStateNucleons = std::max(1, numberofFinalStateNucleons); |
---|
987 | |
---|
988 | G4int PinNucleus = std::max(0, |
---|
989 | G4int(targetNucleus.GetZ()) - protonsInFinalState); |
---|
990 | G4int NinNucleus = std::max(0, |
---|
991 | G4int(targetNucleus.GetN()-targetNucleus.GetZ()) - neutronsInFinalState); |
---|
992 | |
---|
993 | pseudoParticle[3].SetMomentum( 0.0, 0.0, pOriginal*GeV ); |
---|
994 | pseudoParticle[3].SetMass( mOriginal*GeV ); |
---|
995 | pseudoParticle[3].SetTotalEnergy( |
---|
996 | std::sqrt( pOriginal*pOriginal + mOriginal*mOriginal )*GeV ); |
---|
997 | |
---|
998 | G4ParticleDefinition * aOrgDef = modifiedOriginal.GetDefinition(); |
---|
999 | G4int diff = 0; |
---|
1000 | if(aOrgDef == G4Proton::Proton() || aOrgDef == G4Neutron::Neutron() ) diff = 1; |
---|
1001 | if(numberofFinalStateNucleons == 1) diff = 0; |
---|
1002 | pseudoParticle[4].SetMomentum( 0.0, 0.0, 0.0 ); |
---|
1003 | pseudoParticle[4].SetMass( protonMass*(numberofFinalStateNucleons-diff)*MeV ); |
---|
1004 | pseudoParticle[4].SetTotalEnergy( protonMass*(numberofFinalStateNucleons-diff)*MeV ); |
---|
1005 | |
---|
1006 | G4double theoreticalKinetic = |
---|
1007 | pseudoParticle[3].GetTotalEnergy()/MeV + |
---|
1008 | pseudoParticle[4].GetTotalEnergy()/MeV - |
---|
1009 | currentParticle.GetMass()/MeV - |
---|
1010 | targetParticle.GetMass()/MeV; |
---|
1011 | |
---|
1012 | G4double simulatedKinetic = |
---|
1013 | currentParticle.GetKineticEnergy()/MeV + targetParticle.GetKineticEnergy()/MeV; |
---|
1014 | |
---|
1015 | pseudoParticle[5] = pseudoParticle[3] + pseudoParticle[4]; |
---|
1016 | pseudoParticle[3].Lorentz( pseudoParticle[3], pseudoParticle[5] ); |
---|
1017 | pseudoParticle[4].Lorentz( pseudoParticle[4], pseudoParticle[5] ); |
---|
1018 | |
---|
1019 | pseudoParticle[7].SetZero(); |
---|
1020 | pseudoParticle[7] = pseudoParticle[7] + currentParticle; |
---|
1021 | pseudoParticle[7] = pseudoParticle[7] + targetParticle; |
---|
1022 | |
---|
1023 | for( i=0; i<vecLen; ++i ) |
---|
1024 | { |
---|
1025 | pseudoParticle[7] = pseudoParticle[7] + *vec[i]; |
---|
1026 | simulatedKinetic += vec[i]->GetKineticEnergy()/MeV; |
---|
1027 | theoreticalKinetic -= vec[i]->GetMass()/MeV; |
---|
1028 | } |
---|
1029 | |
---|
1030 | if( vecLen <= 16 && vecLen > 0 ) |
---|
1031 | { |
---|
1032 | // must create a new set of ReactionProducts here because GenerateNBody will |
---|
1033 | // modify the momenta for the particles, and we don't want to do this |
---|
1034 | // |
---|
1035 | G4ReactionProduct tempR[130]; |
---|
1036 | tempR[0] = currentParticle; |
---|
1037 | tempR[1] = targetParticle; |
---|
1038 | for( i=0; i<vecLen; ++i )tempR[i+2] = *vec[i]; |
---|
1039 | G4FastVector<G4ReactionProduct,256> tempV; |
---|
1040 | tempV.Initialize( vecLen+2 ); |
---|
1041 | G4int tempLen = 0; |
---|
1042 | for( i=0; i<vecLen+2; ++i )tempV.SetElement( tempLen++, &tempR[i] ); |
---|
1043 | constantCrossSection = true; |
---|
1044 | |
---|
1045 | wgt = GenerateNBodyEvent( pseudoParticle[3].GetTotalEnergy()/MeV+ |
---|
1046 | pseudoParticle[4].GetTotalEnergy()/MeV, |
---|
1047 | constantCrossSection, tempV, tempLen ); |
---|
1048 | if (wgt == -1) { |
---|
1049 | G4double Qvalue = 0; |
---|
1050 | for (i = 0; i < tempLen; i++) Qvalue += tempV[i]->GetMass(); |
---|
1051 | wgt = GenerateNBodyEvent( Qvalue/MeV, |
---|
1052 | constantCrossSection, tempV, tempLen ); |
---|
1053 | } |
---|
1054 | if(wgt>-.5) |
---|
1055 | { |
---|
1056 | theoreticalKinetic = 0.0; |
---|
1057 | for( i=0; i<tempLen; ++i ) |
---|
1058 | { |
---|
1059 | pseudoParticle[6].Lorentz( *tempV[i], pseudoParticle[4] ); |
---|
1060 | theoreticalKinetic += pseudoParticle[6].GetKineticEnergy()/MeV; |
---|
1061 | } |
---|
1062 | } |
---|
1063 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
1064 | } |
---|
1065 | // |
---|
1066 | // Make sure, that the kinetic energies are correct |
---|
1067 | // |
---|
1068 | if( simulatedKinetic != 0.0 ) |
---|
1069 | { |
---|
1070 | wgt = (theoreticalKinetic)/simulatedKinetic; |
---|
1071 | theoreticalKinetic = currentParticle.GetKineticEnergy()/MeV * wgt; |
---|
1072 | simulatedKinetic = theoreticalKinetic; |
---|
1073 | currentParticle.SetKineticEnergy( theoreticalKinetic*MeV ); |
---|
1074 | pp = currentParticle.GetTotalMomentum()/MeV; |
---|
1075 | pp1 = currentParticle.GetMomentum().mag()/MeV; |
---|
1076 | if( pp1 < 1.0e-6*GeV ) { |
---|
1077 | G4ThreeVector iso = Isotropic(pp); |
---|
1078 | currentParticle.SetMomentum( iso.x(), iso.y(), iso.z() ); |
---|
1079 | } else { |
---|
1080 | currentParticle.SetMomentum( currentParticle.GetMomentum() * (pp/pp1) ); |
---|
1081 | } |
---|
1082 | theoreticalKinetic = targetParticle.GetKineticEnergy()/MeV * wgt; |
---|
1083 | targetParticle.SetKineticEnergy( theoreticalKinetic*MeV ); |
---|
1084 | simulatedKinetic += theoreticalKinetic; |
---|
1085 | pp = targetParticle.GetTotalMomentum()/MeV; |
---|
1086 | pp1 = targetParticle.GetMomentum().mag()/MeV; |
---|
1087 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
1088 | if( pp1 < 1.0e-6*GeV ) { |
---|
1089 | G4ThreeVector iso = Isotropic(pp); |
---|
1090 | targetParticle.SetMomentum( iso.x(), iso.y(), iso.z() ); |
---|
1091 | } else { |
---|
1092 | targetParticle.SetMomentum( targetParticle.GetMomentum() * (pp/pp1) ); |
---|
1093 | } |
---|
1094 | |
---|
1095 | for( i=0; i<vecLen; ++i ) { |
---|
1096 | theoreticalKinetic = vec[i]->GetKineticEnergy()/MeV * wgt; |
---|
1097 | simulatedKinetic += theoreticalKinetic; |
---|
1098 | vec[i]->SetKineticEnergy( theoreticalKinetic*MeV ); |
---|
1099 | pp = vec[i]->GetTotalMomentum()/MeV; |
---|
1100 | pp1 = vec[i]->GetMomentum().mag()/MeV; |
---|
1101 | if( pp1 < 1.0e-6*GeV ) { |
---|
1102 | G4ThreeVector iso = Isotropic(pp); |
---|
1103 | vec[i]->SetMomentum( iso.x(), iso.y(), iso.z() ); |
---|
1104 | } else { |
---|
1105 | vec[i]->SetMomentum( vec[i]->GetMomentum() * (pp/pp1) ); |
---|
1106 | } |
---|
1107 | } |
---|
1108 | } |
---|
1109 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
1110 | |
---|
1111 | Rotate( numberofFinalStateNucleons, pseudoParticle[3].GetMomentum(), |
---|
1112 | modifiedOriginal, originalIncident, targetNucleus, |
---|
1113 | currentParticle, targetParticle, vec, vecLen ); |
---|
1114 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
1115 | // |
---|
1116 | // add black track particles |
---|
1117 | // the total number of particles produced is restricted to 198 |
---|
1118 | // this may have influence on very high energies |
---|
1119 | // |
---|
1120 | if( atomicWeight >= 1.5 ) |
---|
1121 | { |
---|
1122 | // npnb is number of proton/neutron black track particles |
---|
1123 | // ndta is the number of deuterons, tritons, and alphas produced |
---|
1124 | // epnb is the kinetic energy available for proton/neutron black track particles |
---|
1125 | // edta is the kinetic energy available for deuteron/triton/alpha particles |
---|
1126 | // |
---|
1127 | G4int npnb = 0; |
---|
1128 | G4int ndta = 0; |
---|
1129 | |
---|
1130 | G4double epnb, edta; |
---|
1131 | if (veryForward) { |
---|
1132 | epnb = targetNucleus.GetAnnihilationPNBlackTrackEnergy(); |
---|
1133 | edta = targetNucleus.GetAnnihilationDTABlackTrackEnergy(); |
---|
1134 | } else { |
---|
1135 | epnb = targetNucleus.GetPNBlackTrackEnergy(); |
---|
1136 | edta = targetNucleus.GetDTABlackTrackEnergy(); |
---|
1137 | } |
---|
1138 | |
---|
1139 | const G4double pnCutOff = 0.001; |
---|
1140 | const G4double dtaCutOff = 0.001; |
---|
1141 | const G4double kineticMinimum = 1.e-6; |
---|
1142 | const G4double kineticFactor = -0.010; |
---|
1143 | G4double sprob = 0.0; // sprob = probability of self-absorption in heavy molecules |
---|
1144 | const G4double ekIncident = originalIncident->GetKineticEnergy()/GeV; |
---|
1145 | if( ekIncident >= 5.0 )sprob = std::min( 1.0, 0.6*std::log(ekIncident-4.0) ); |
---|
1146 | if( epnb >= pnCutOff ) |
---|
1147 | { |
---|
1148 | npnb = G4Poisson((1.5+1.25*numberofFinalStateNucleons)*epnb/(epnb+edta)); |
---|
1149 | if( numberofFinalStateNucleons + npnb > atomicWeight ) |
---|
1150 | npnb = G4int(atomicWeight+0.00001 - numberofFinalStateNucleons); |
---|
1151 | npnb = std::min( npnb, 127-vecLen ); |
---|
1152 | } |
---|
1153 | if( edta >= dtaCutOff ) |
---|
1154 | { |
---|
1155 | ndta = G4Poisson( (1.5+1.25*numberofFinalStateNucleons)*edta/(epnb+edta) ); |
---|
1156 | ndta = std::min( ndta, 127-vecLen ); |
---|
1157 | } |
---|
1158 | if (npnb == 0 && ndta == 0) npnb = 1; |
---|
1159 | |
---|
1160 | // DEBUGGING --> DumpFrames::DumpFrame(vec, vecLen); |
---|
1161 | |
---|
1162 | AddBlackTrackParticles(epnb, npnb, edta, ndta, sprob, kineticMinimum, |
---|
1163 | kineticFactor, modifiedOriginal, |
---|
1164 | PinNucleus, NinNucleus, targetNucleus, |
---|
1165 | vec, vecLen); |
---|
1166 | } |
---|
1167 | // if( centerofmassEnergy <= (4.0+G4UniformRand()) ) |
---|
1168 | // MomentumCheck( modifiedOriginal, currentParticle, targetParticle, |
---|
1169 | // vec, vecLen ); |
---|
1170 | // |
---|
1171 | // calculate time delay for nuclear reactions |
---|
1172 | // |
---|
1173 | if( (atomicWeight >= 1.5) && (atomicWeight <= 230.0) && (ekOriginal <= 0.2) ) |
---|
1174 | currentParticle.SetTOF( |
---|
1175 | 1.0-500.0*std::exp(-ekOriginal/0.04)*std::log(G4UniformRand()) ); |
---|
1176 | else |
---|
1177 | currentParticle.SetTOF( 1.0 ); |
---|
1178 | return true; |
---|
1179 | |
---|
1180 | } |
---|
1181 | |
---|
1182 | /* end of file */ |
---|