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 | // |
---|
27 | // |
---|
28 | // ------------------------------------------------------------ |
---|
29 | // GEANT 4 class implementation file |
---|
30 | // |
---|
31 | // ---------------- G4Fancy3DNucleus ---------------- |
---|
32 | // by Gunter Folger, May 1998. |
---|
33 | // class for a 3D nucleus, arranging nucleons in space and momentum. |
---|
34 | // ------------------------------------------------------------ |
---|
35 | |
---|
36 | #include "G4Fancy3DNucleus.hh" |
---|
37 | #include "G4NuclearFermiDensity.hh" |
---|
38 | #include "G4NuclearShellModelDensity.hh" |
---|
39 | #include "G4NucleiProperties.hh" |
---|
40 | #include "Randomize.hh" |
---|
41 | #include "G4ios.hh" |
---|
42 | #include <algorithm> |
---|
43 | #include "G4HadronicException.hh" |
---|
44 | |
---|
45 | |
---|
46 | G4Fancy3DNucleus::G4Fancy3DNucleus() |
---|
47 | : nucleondistance(0.8*fermi) |
---|
48 | { |
---|
49 | theDensity=0; |
---|
50 | theNucleons=0; |
---|
51 | currentNucleon=-1; |
---|
52 | myA=0; |
---|
53 | myZ=0; |
---|
54 | //G4cout <<"G4Fancy3DNucleus::G4Fancy3DNucleus()"<<G4endl; |
---|
55 | } |
---|
56 | |
---|
57 | G4Fancy3DNucleus::~G4Fancy3DNucleus() |
---|
58 | { |
---|
59 | if(theNucleons) delete [] theNucleons; |
---|
60 | if(theDensity) delete theDensity; |
---|
61 | } |
---|
62 | |
---|
63 | |
---|
64 | void G4Fancy3DNucleus::Init(G4double theA, G4double theZ) |
---|
65 | { |
---|
66 | // G4cout << "G4Fancy3DNucleus::Init(theA, theZ) called"<<G4endl; |
---|
67 | currentNucleon=-1; |
---|
68 | if(theNucleons) delete [] theNucleons; |
---|
69 | |
---|
70 | theRWNucleons.clear(); |
---|
71 | |
---|
72 | myZ = G4int(theZ); |
---|
73 | myA= ( G4UniformRand()>theA-G4int(theA) ) ? G4int(theA) : G4int(theA)+1; |
---|
74 | |
---|
75 | theNucleons = new G4Nucleon[myA]; |
---|
76 | |
---|
77 | // G4cout << "myA, myZ" << myA << ", " << myZ << G4endl; |
---|
78 | |
---|
79 | if(theDensity) delete theDensity; |
---|
80 | if ( myA < 17 ) { |
---|
81 | theDensity = new G4NuclearShellModelDensity(myA, myZ); |
---|
82 | } else { |
---|
83 | theDensity = new G4NuclearFermiDensity(myA, myZ); |
---|
84 | } |
---|
85 | |
---|
86 | theFermi.Init(myA, myZ); |
---|
87 | |
---|
88 | ChooseNucleons(); |
---|
89 | |
---|
90 | ChoosePositions(); |
---|
91 | |
---|
92 | // CenterNucleons(); // This would introduce a bias |
---|
93 | |
---|
94 | ChooseFermiMomenta(); |
---|
95 | |
---|
96 | G4double Ebinding= BindingEnergy()/myA; |
---|
97 | |
---|
98 | for (G4int aNucleon=0; aNucleon < myA; aNucleon++) |
---|
99 | { |
---|
100 | theNucleons[aNucleon].SetBindingEnergy(Ebinding); |
---|
101 | } |
---|
102 | |
---|
103 | |
---|
104 | return; |
---|
105 | } |
---|
106 | |
---|
107 | G4bool G4Fancy3DNucleus::StartLoop() |
---|
108 | { |
---|
109 | currentNucleon=0; |
---|
110 | return theNucleons; |
---|
111 | } |
---|
112 | |
---|
113 | G4Nucleon * G4Fancy3DNucleus::GetNextNucleon() |
---|
114 | { |
---|
115 | return ( currentNucleon>=0 && currentNucleon<myA ) ? |
---|
116 | theNucleons+currentNucleon++ : 0; |
---|
117 | } |
---|
118 | |
---|
119 | const std::vector<G4Nucleon *> & G4Fancy3DNucleus::GetNucleons() |
---|
120 | { |
---|
121 | if ( theRWNucleons.size()==0 ) |
---|
122 | { |
---|
123 | for (G4int i=0; i< myA; i++) |
---|
124 | { |
---|
125 | theRWNucleons.push_back(theNucleons+i); |
---|
126 | } |
---|
127 | } |
---|
128 | return theRWNucleons; |
---|
129 | } |
---|
130 | |
---|
131 | //void G4Fancy3DNucleus::SortNucleonsIncZ() // on increased Z-coordinates Uzhi 29.08.08 |
---|
132 | |
---|
133 | bool G4Fancy3DNucleusHelperForSortInZ(const G4Nucleon* nuc1, const G4Nucleon* nuc2) |
---|
134 | { |
---|
135 | return nuc1->GetPosition().z() < nuc2->GetPosition().z(); |
---|
136 | } |
---|
137 | |
---|
138 | //void G4Fancy3DNucleus::SortNucleonsInZ() |
---|
139 | void G4Fancy3DNucleus::SortNucleonsIncZ() // on increased Z-coordinates Uzhi 29.08.08 |
---|
140 | { |
---|
141 | |
---|
142 | GetNucleons(); // make sure theRWNucleons is initialised |
---|
143 | |
---|
144 | if (theRWNucleons.size() < 2 ) return; |
---|
145 | |
---|
146 | sort( theRWNucleons.begin(),theRWNucleons.end(),G4Fancy3DNucleusHelperForSortInZ); |
---|
147 | |
---|
148 | // now copy sorted nucleons to theNucleons array. TheRWNucleons are pointers in theNucleons |
---|
149 | // so we need to copy to new, and then swap. |
---|
150 | G4Nucleon * sortedNucleons = new G4Nucleon[myA]; |
---|
151 | for ( unsigned int i=0; i<theRWNucleons.size(); i++ ) |
---|
152 | { |
---|
153 | sortedNucleons[i]= *(theRWNucleons[i]); |
---|
154 | } |
---|
155 | |
---|
156 | theRWNucleons.clear(); // about to delete array these point to.... |
---|
157 | delete [] theNucleons; |
---|
158 | |
---|
159 | theNucleons=sortedNucleons; |
---|
160 | |
---|
161 | return; |
---|
162 | } |
---|
163 | |
---|
164 | void G4Fancy3DNucleus::SortNucleonsDecZ() // on decreased Z-coordinates Uzhi 29.08.08 |
---|
165 | { |
---|
166 | G4Nucleon * sortedNucleons = new G4Nucleon[myA]; |
---|
167 | |
---|
168 | GetNucleons(); // make sure theRWNucleons is initialised |
---|
169 | |
---|
170 | if (theRWNucleons.size() < 2 ) return; |
---|
171 | sort( theRWNucleons.begin(),theRWNucleons.end(),G4Fancy3DNucleusHelperForSortInZ); |
---|
172 | |
---|
173 | // now copy sorted nucleons to theNucleons array. TheRWNucleons are pointers in theNucleons |
---|
174 | // so we need to copy to new, and then swap. |
---|
175 | for ( unsigned int i=0; i<theRWNucleons.size(); i++ ) |
---|
176 | { |
---|
177 | sortedNucleons[i]= *(theRWNucleons[myA-1-i]); // Uzhi 29.08.08 |
---|
178 | } |
---|
179 | theRWNucleons.clear(); // about to delete array elements these point to.... |
---|
180 | delete [] theNucleons; |
---|
181 | theNucleons=sortedNucleons; |
---|
182 | |
---|
183 | return; |
---|
184 | } |
---|
185 | |
---|
186 | G4double G4Fancy3DNucleus::BindingEnergy() |
---|
187 | { |
---|
188 | return G4NucleiProperties::GetBindingEnergy(myA,myZ); |
---|
189 | } |
---|
190 | |
---|
191 | |
---|
192 | G4double G4Fancy3DNucleus::GetNuclearRadius() |
---|
193 | { |
---|
194 | return GetNuclearRadius(0.5); |
---|
195 | } |
---|
196 | |
---|
197 | G4double G4Fancy3DNucleus::GetNuclearRadius(const G4double maxRelativeDensity) |
---|
198 | { |
---|
199 | return theDensity->GetRadius(maxRelativeDensity); |
---|
200 | } |
---|
201 | |
---|
202 | G4double G4Fancy3DNucleus::GetOuterRadius() |
---|
203 | { |
---|
204 | G4double maxradius2=0; |
---|
205 | |
---|
206 | for (int i=0; i<myA; i++) |
---|
207 | { |
---|
208 | if ( theNucleons[i].GetPosition().mag2() > maxradius2 ) |
---|
209 | { |
---|
210 | maxradius2=theNucleons[i].GetPosition().mag2(); |
---|
211 | } |
---|
212 | } |
---|
213 | return std::sqrt(maxradius2)+nucleondistance; |
---|
214 | } |
---|
215 | |
---|
216 | G4double G4Fancy3DNucleus::GetMass() |
---|
217 | { |
---|
218 | return myZ*G4Proton::Proton()->GetPDGMass() + |
---|
219 | (myA-myZ)*G4Neutron::Neutron()->GetPDGMass() - |
---|
220 | BindingEnergy(); |
---|
221 | } |
---|
222 | |
---|
223 | |
---|
224 | |
---|
225 | void G4Fancy3DNucleus::DoLorentzBoost(const G4LorentzVector & theBoost) |
---|
226 | { |
---|
227 | for (G4int i=0; i<myA; i++){ |
---|
228 | theNucleons[i].Boost(theBoost); |
---|
229 | } |
---|
230 | } |
---|
231 | |
---|
232 | void G4Fancy3DNucleus::DoLorentzBoost(const G4ThreeVector & theBeta) |
---|
233 | { |
---|
234 | for (G4int i=0; i<myA; i++){ |
---|
235 | theNucleons[i].Boost(theBeta); |
---|
236 | } |
---|
237 | } |
---|
238 | |
---|
239 | void G4Fancy3DNucleus::DoLorentzContraction(const G4ThreeVector & theBeta) |
---|
240 | { |
---|
241 | G4double factor=(1-std::sqrt(1-theBeta.mag2()))/theBeta.mag2(); // (gamma-1)/gamma/beta**2 |
---|
242 | for (G4int i=0; i< myA; i++) |
---|
243 | { |
---|
244 | G4ThreeVector rprime=theNucleons[i].GetPosition() - |
---|
245 | factor * (theBeta*theNucleons[i].GetPosition()) * |
---|
246 | // theNucleons[i].GetPosition(); |
---|
247 | theBeta; |
---|
248 | theNucleons[i].SetPosition(rprime); |
---|
249 | } |
---|
250 | } |
---|
251 | |
---|
252 | void G4Fancy3DNucleus::DoLorentzContraction(const G4LorentzVector & theBoost) |
---|
253 | { |
---|
254 | G4ThreeVector beta= 1/theBoost.e() * theBoost.vect(); |
---|
255 | // DoLorentzBoost(beta); |
---|
256 | DoLorentzContraction(beta); |
---|
257 | } |
---|
258 | |
---|
259 | |
---|
260 | |
---|
261 | void G4Fancy3DNucleus::CenterNucleons() |
---|
262 | { |
---|
263 | G4ThreeVector center; |
---|
264 | |
---|
265 | for (G4int i=0; i<myA; i++ ) |
---|
266 | { |
---|
267 | center+=theNucleons[i].GetPosition(); |
---|
268 | } |
---|
269 | center *= -1./myA; |
---|
270 | DoTranslation(center); |
---|
271 | } |
---|
272 | |
---|
273 | void G4Fancy3DNucleus::DoTranslation(const G4ThreeVector & theShift) |
---|
274 | { |
---|
275 | for (G4int i=0; i<myA; i++ ) |
---|
276 | { |
---|
277 | G4ThreeVector tempV = theNucleons[i].GetPosition() + theShift; |
---|
278 | theNucleons[i].SetPosition(tempV); |
---|
279 | } |
---|
280 | } |
---|
281 | |
---|
282 | const G4VNuclearDensity * G4Fancy3DNucleus::GetNuclearDensity() const |
---|
283 | { |
---|
284 | return theDensity; |
---|
285 | } |
---|
286 | |
---|
287 | //----------------------- private Implementation Methods------------- |
---|
288 | |
---|
289 | void G4Fancy3DNucleus::ChooseNucleons() |
---|
290 | { |
---|
291 | G4int protons=0,nucleons=0; |
---|
292 | |
---|
293 | while (nucleons < myA ) |
---|
294 | { |
---|
295 | if ( protons < myZ && G4UniformRand() < (G4double)(myZ-protons)/(G4double)(myA-nucleons) ) |
---|
296 | { |
---|
297 | protons++; |
---|
298 | theNucleons[nucleons++].SetParticleType(G4Proton::Proton()); |
---|
299 | } |
---|
300 | else if ( (nucleons-protons) < (myA-myZ) ) |
---|
301 | { |
---|
302 | theNucleons[nucleons++].SetParticleType(G4Neutron::Neutron()); |
---|
303 | } |
---|
304 | else G4cout << "G4Fancy3DNucleus::ChooseNucleons not efficient" << G4endl; |
---|
305 | } |
---|
306 | return; |
---|
307 | } |
---|
308 | |
---|
309 | void G4Fancy3DNucleus::ChoosePositions() |
---|
310 | { |
---|
311 | G4int i=0; |
---|
312 | G4ThreeVector aPos, delta; |
---|
313 | std::vector<G4ThreeVector> places; |
---|
314 | places.reserve(myA); |
---|
315 | G4bool freeplace; |
---|
316 | static G4double nd2 = sqr(nucleondistance); |
---|
317 | G4double maxR=GetNuclearRadius(0.001); // there are no nucleons at a |
---|
318 | // relative Density of 0.01 |
---|
319 | G4int jr=0; |
---|
320 | G4int jx,jy; |
---|
321 | G4double arand[600]; |
---|
322 | G4double *prand=arand; |
---|
323 | while ( i < myA ) |
---|
324 | { |
---|
325 | do |
---|
326 | { |
---|
327 | if ( jr < 3 ) |
---|
328 | { |
---|
329 | jr=std::min(600,9*(myA - i)); |
---|
330 | CLHEP::RandFlat::shootArray(jr, prand ); |
---|
331 | } |
---|
332 | jx=--jr; |
---|
333 | jy=--jr; |
---|
334 | aPos=G4ThreeVector( (2*arand[jx]-1.), |
---|
335 | (2*arand[jy]-1.), |
---|
336 | (2*arand[--jr]-1.)); |
---|
337 | } while (aPos.mag2() > 1. ); |
---|
338 | aPos *=maxR; |
---|
339 | G4double density=theDensity->GetRelativeDensity(aPos); |
---|
340 | if (G4UniformRand() < density) |
---|
341 | { |
---|
342 | freeplace= true; |
---|
343 | std::vector<G4ThreeVector>::iterator iplace; |
---|
344 | for( iplace=places.begin(); iplace!=places.end() && freeplace;++iplace) |
---|
345 | { |
---|
346 | delta = *iplace - aPos; |
---|
347 | freeplace= delta.mag2() > nd2; |
---|
348 | } |
---|
349 | |
---|
350 | if ( freeplace ) |
---|
351 | { |
---|
352 | G4double pFermi=theFermi.GetFermiMomentum(theDensity->GetDensity(aPos)); |
---|
353 | // protons must at least have binding energy of CoulombBarrier, so |
---|
354 | // assuming the Fermi energy corresponds to a potential, we must place these such |
---|
355 | // that the Fermi Energy > CoulombBarrier |
---|
356 | if (theNucleons[i].GetDefinition() == G4Proton::Proton()) |
---|
357 | { |
---|
358 | G4double eFermi= std::sqrt( sqr(pFermi) + sqr(theNucleons[i].GetDefinition()->GetPDGMass()) ) |
---|
359 | - theNucleons[i].GetDefinition()->GetPDGMass(); |
---|
360 | if (eFermi <= CoulombBarrier() ) freeplace=false; |
---|
361 | } |
---|
362 | } |
---|
363 | if ( freeplace ) |
---|
364 | { |
---|
365 | theNucleons[i].SetPosition(aPos); |
---|
366 | places.push_back(aPos); |
---|
367 | ++i; |
---|
368 | } |
---|
369 | } |
---|
370 | } |
---|
371 | |
---|
372 | } |
---|
373 | |
---|
374 | void G4Fancy3DNucleus::ChooseFermiMomenta() |
---|
375 | { |
---|
376 | G4int i; |
---|
377 | G4double density; |
---|
378 | G4ThreeVector * momentum=new G4ThreeVector[myA]; |
---|
379 | |
---|
380 | G4double * fermiM=new G4double[myA]; |
---|
381 | |
---|
382 | for (G4int ntry=0; ntry<1 ; ntry ++ ) |
---|
383 | { |
---|
384 | for (i=0; i < myA; i++ ) // momenta for all, including last, in case we swap nucleons |
---|
385 | { |
---|
386 | density = theDensity->GetDensity(theNucleons[i].GetPosition()); |
---|
387 | fermiM[i] = theFermi.GetFermiMomentum(density); |
---|
388 | G4ThreeVector mom=theFermi.GetMomentum(density); |
---|
389 | if (theNucleons[i].GetDefinition() == G4Proton::Proton()) |
---|
390 | { |
---|
391 | G4double eMax = std::sqrt(sqr(fermiM[i]) +sqr(theNucleons[i].GetDefinition()->GetPDGMass()) ) |
---|
392 | - CoulombBarrier(); |
---|
393 | if ( eMax > theNucleons[i].GetDefinition()->GetPDGMass() ) |
---|
394 | { |
---|
395 | G4double pmax2= sqr(eMax) - sqr(theNucleons[i].GetDefinition()->GetPDGMass()); |
---|
396 | fermiM[i] = std::sqrt(pmax2); |
---|
397 | while ( mom.mag2() > pmax2 ) |
---|
398 | { |
---|
399 | mom=theFermi.GetMomentum(density, fermiM[i]); |
---|
400 | } |
---|
401 | } else |
---|
402 | { |
---|
403 | G4cerr << "G4Fancy3DNucleus: difficulty finding proton momentum" << G4endl; |
---|
404 | mom=G4ThreeVector(0,0,0); |
---|
405 | } |
---|
406 | |
---|
407 | } |
---|
408 | momentum[i]= mom; |
---|
409 | } |
---|
410 | |
---|
411 | if (ReduceSum(momentum,fermiM) ) |
---|
412 | break; |
---|
413 | // G4cout <<" G4FancyNucleus: iterating to find momenta: "<< ntry<< G4endl; |
---|
414 | } |
---|
415 | |
---|
416 | // G4ThreeVector sum; |
---|
417 | // for (G4int index=0; index<myA;sum+=momentum[index++]) |
---|
418 | // ; |
---|
419 | // G4cout << "final sum / mag() " << sum << " / " << sum.mag() << G4endl; |
---|
420 | |
---|
421 | G4double energy; |
---|
422 | for ( i=0; i< myA ; i++ ) |
---|
423 | { |
---|
424 | energy = theNucleons[i].GetParticleType()->GetPDGMass() |
---|
425 | - BindingEnergy()/myA; |
---|
426 | G4LorentzVector tempV(momentum[i],energy); |
---|
427 | theNucleons[i].SetMomentum(tempV); |
---|
428 | } |
---|
429 | |
---|
430 | delete [] momentum; |
---|
431 | delete [] fermiM; |
---|
432 | } |
---|
433 | |
---|
434 | class G4Fancy3DNucleusHelper // Helper class |
---|
435 | { |
---|
436 | public: |
---|
437 | G4Fancy3DNucleusHelper(const G4ThreeVector &vec,const G4double size,const G4int index) |
---|
438 | : Vector(vec), Size(size), anInt(index) {} |
---|
439 | int operator ==(const G4Fancy3DNucleusHelper &right) const |
---|
440 | { |
---|
441 | return this==&right; |
---|
442 | } |
---|
443 | int operator < (const G4Fancy3DNucleusHelper &right) const |
---|
444 | { |
---|
445 | return size()<right.size(); |
---|
446 | } |
---|
447 | const G4ThreeVector& vector() const |
---|
448 | { |
---|
449 | return Vector; |
---|
450 | } |
---|
451 | G4double size() const |
---|
452 | { |
---|
453 | return Size; |
---|
454 | } |
---|
455 | G4int index() const |
---|
456 | { |
---|
457 | return anInt; |
---|
458 | } |
---|
459 | G4Fancy3DNucleusHelper operator =(const G4Fancy3DNucleusHelper &right) |
---|
460 | { |
---|
461 | Vector = right.Vector; |
---|
462 | Size = right.Size; |
---|
463 | anInt = right.anInt; |
---|
464 | return *this; |
---|
465 | } |
---|
466 | |
---|
467 | private: |
---|
468 | G4Fancy3DNucleusHelper(): Vector(0), Size(0), anInt(0) {G4cout << "def ctor for MixMasch" << G4endl;} |
---|
469 | G4ThreeVector Vector; |
---|
470 | G4double Size; |
---|
471 | G4int anInt; |
---|
472 | }; |
---|
473 | |
---|
474 | G4bool G4Fancy3DNucleus::ReduceSum(G4ThreeVector * momentum, G4double *pFermiM) |
---|
475 | { |
---|
476 | G4ThreeVector sum; |
---|
477 | G4double PFermi=pFermiM[myA-1]; |
---|
478 | |
---|
479 | for (G4int i=0; i < myA-1 ; i++ ) |
---|
480 | { sum+=momentum[i]; } |
---|
481 | |
---|
482 | // check if have to do anything at all.. |
---|
483 | if ( sum.mag() <= PFermi ) |
---|
484 | { |
---|
485 | momentum[myA-1]=-sum; |
---|
486 | return true; |
---|
487 | } |
---|
488 | |
---|
489 | // find all possible changes in momentum, changing only the component parallel to sum |
---|
490 | G4ThreeVector testDir=sum.unit(); |
---|
491 | std::vector<G4Fancy3DNucleusHelper> testSums; // Sorted on delta.mag() |
---|
492 | |
---|
493 | for ( G4int aNucleon=0; aNucleon < myA-1; aNucleon++){ |
---|
494 | G4ThreeVector delta=2*((momentum[aNucleon]*testDir)* testDir); |
---|
495 | testSums.push_back(G4Fancy3DNucleusHelper(delta,delta.mag(),aNucleon)); |
---|
496 | } |
---|
497 | std::sort(testSums.begin(), testSums.end()); |
---|
498 | |
---|
499 | // reduce Momentum Sum until the next would be allowed. |
---|
500 | G4int index=testSums.size(); |
---|
501 | while ( (sum-testSums[--index].vector()).mag()>PFermi && index>0) |
---|
502 | { |
---|
503 | // Only take one which improve, ie. don't change sign and overshoot... |
---|
504 | if ( sum.mag() > (sum-testSums[index].vector()).mag() ) { |
---|
505 | momentum[testSums[index].index()]-=testSums[index].vector(); |
---|
506 | sum-=testSums[index].vector(); |
---|
507 | } |
---|
508 | } |
---|
509 | |
---|
510 | if ( (sum-testSums[index].vector()).mag() <= PFermi ) |
---|
511 | { |
---|
512 | G4int best=-1; |
---|
513 | G4double pBest=2*PFermi; // anything larger than PFermi |
---|
514 | for ( G4int aNucleon=0; aNucleon<=index; aNucleon++) |
---|
515 | { |
---|
516 | // find the momentum closest to choosen momentum for last Nucleon. |
---|
517 | G4double pTry=(testSums[aNucleon].vector()-sum).mag(); |
---|
518 | if ( pTry < PFermi |
---|
519 | && std::abs(momentum[myA-1].mag() - pTry ) < pBest ) |
---|
520 | { |
---|
521 | pBest=std::abs(momentum[myA-1].mag() - pTry ); |
---|
522 | best=aNucleon; |
---|
523 | } |
---|
524 | } |
---|
525 | if ( best < 0 ) |
---|
526 | { |
---|
527 | G4String text = "G4Fancy3DNucleus.cc: Logic error in ReduceSum()"; |
---|
528 | throw G4HadronicException(__FILE__, __LINE__, text); |
---|
529 | } |
---|
530 | momentum[testSums[best].index()]-=testSums[best].vector(); |
---|
531 | momentum[myA-1]=testSums[best].vector()-sum; |
---|
532 | |
---|
533 | testSums.clear(); |
---|
534 | return true; |
---|
535 | |
---|
536 | } |
---|
537 | testSums.clear(); |
---|
538 | |
---|
539 | // try to compensate momentum using another Nucleon.... |
---|
540 | |
---|
541 | G4int swapit=-1; |
---|
542 | while (swapit<myA-1) |
---|
543 | { |
---|
544 | if ( pFermiM[++swapit] > PFermi ) break; |
---|
545 | } |
---|
546 | if (swapit == myA-1 ) return false; |
---|
547 | |
---|
548 | // Now we have a nucleon with a bigger Fermi Momentum. |
---|
549 | // Exchange with last nucleon.. and iterate. |
---|
550 | G4Nucleon swap= theNucleons[swapit]; |
---|
551 | G4ThreeVector mom_swap=momentum[swapit]; |
---|
552 | G4double pf=pFermiM[swapit]; |
---|
553 | theNucleons[swapit]=theNucleons[myA-1]; |
---|
554 | momentum[swapit]=momentum[myA-1]; |
---|
555 | pFermiM[swapit]=pFermiM[myA-1]; |
---|
556 | theNucleons[myA-1]=swap; |
---|
557 | momentum[myA-1]=mom_swap; |
---|
558 | pFermiM[myA-1]=pf; |
---|
559 | return ReduceSum(momentum,pFermiM); |
---|
560 | } |
---|
561 | |
---|
562 | G4double G4Fancy3DNucleus::CoulombBarrier() |
---|
563 | { |
---|
564 | G4double coulombBarrier = (1.44/1.14) * MeV * myZ / (1.0 + std::pow(G4double(myA),1./3.)); |
---|
565 | return coulombBarrier; |
---|
566 | } |
---|