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G4StatMFMacroCanonical.cc
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25 //
26 //
27 // $Id$
28 //
29 // by V. Lara
30 // --------------------------------------------------------------------
31 //
32 // Modified:
33 // 25.07.08 I.Pshenichnov (in collaboration with Alexander Botvina and Igor
34 // Mishustin (FIAS, Frankfurt, INR, Moscow and Kurchatov Institute,
35 // Moscow, pshenich@fias.uni-frankfurt.de) fixed infinite loop for
36 // a fagment with Z=A; fixed memory leak
37 
39 #include "G4PhysicalConstants.hh"
40 #include "G4SystemOfUnits.hh"
41 #include "G4Pow.hh"
42 
43 // constructor
45 {
46 
47  // Get memory for clusters
48  _theClusters.push_back(new G4StatMFMacroNucleon); // Size 1
49  _theClusters.push_back(new G4StatMFMacroBiNucleon); // Size 2
50  _theClusters.push_back(new G4StatMFMacroTriNucleon); // Size 3
51  _theClusters.push_back(new G4StatMFMacroTetraNucleon); // Size 4
52  for (G4int i = 4; i < theFragment.GetA_asInt(); i++)
53  _theClusters.push_back(new G4StatMFMacroMultiNucleon(i+1)); // Size 5 ... A
54 
55  // Perform class initialization
56  Initialize(theFragment);
57 
58 }
59 
60 // destructor
62 {
63  // garbage collection
64  if (!_theClusters.empty())
65  {
66  std::for_each(_theClusters.begin(),_theClusters.end(),DeleteFragment());
67  }
68 }
69 
70 // Initialization method
71 void G4StatMFMacroCanonical::Initialize(const G4Fragment & theFragment)
72 {
73 
74  G4int A = theFragment.GetA_asInt();
75  G4int Z = theFragment.GetZ_asInt();
76  G4double x = 1.0 - 2.0*Z/G4double(A);
77  G4Pow* g4pow = G4Pow::GetInstance();
78 
79  // Free Internal energy at T = 0
80  __FreeInternalE0 = A*( -G4StatMFParameters::GetE0() + // Volume term (for T = 0)
81  G4StatMFParameters::GetGamma0()*x*x) // Symmetry term
82  +
83  G4StatMFParameters::GetBeta0()*g4pow->Z23(A) + // Surface term (for T = 0)
84  (3.0/5.0)*elm_coupling*Z*Z/(G4StatMFParameters::Getr0()* // Coulomb term
85  g4pow->Z13(A));
86 
87  CalculateTemperature(theFragment);
88 
89  return;
90 }
91 
92 void G4StatMFMacroCanonical::CalculateTemperature(const G4Fragment & theFragment)
93 {
94  // Excitation Energy
95  G4double U = theFragment.GetExcitationEnergy();
96 
97  G4int A = theFragment.GetA_asInt();
98  G4int Z = theFragment.GetZ_asInt();
99 
100  // Fragment Multiplicity
101  G4double FragMult = std::max((1.0+(2.31/MeV)*(U/A - 3.5*MeV))*A/100.0, 2.0);
102 
103 
104  // Parameter Kappa
105  _Kappa = (1.0+elm_coupling*(std::pow(FragMult,1./3.)-1)/
107  _Kappa = _Kappa*_Kappa*_Kappa - 1.0;
108 
109 
110  G4StatMFMacroTemperature * theTemp = new
111  G4StatMFMacroTemperature(A,Z,U,__FreeInternalE0,_Kappa,&_theClusters);
112 
113  __MeanTemperature = theTemp->CalcTemperature();
114  _ChemPotentialNu = theTemp->GetChemicalPotentialNu();
115  _ChemPotentialMu = theTemp->GetChemicalPotentialMu();
117  __MeanEntropy = theTemp->GetEntropy();
118 
119  delete theTemp;
120 
121  return;
122 }
123 
124 
125 // --------------------------------------------------------------------------
126 
128  // Calculate total fragments multiplicity, fragment atomic numbers and charges
129 {
130  G4int A = theFragment.GetA_asInt();
131  G4int Z = theFragment.GetZ_asInt();
132 
133  std::vector<G4int> ANumbers(A);
134 
135  G4double Multiplicity = ChooseA(A,ANumbers);
136 
137  std::vector<G4int> FragmentsA;
138 
139  G4int i = 0;
140  for (i = 0; i < A; i++)
141  {
142  for (G4int j = 0; j < ANumbers[i]; j++) FragmentsA.push_back(i+1);
143  }
144 
145  // Sort fragments in decreasing order
146  G4int im = 0;
147  for (G4int j = 0; j < Multiplicity; j++)
148  {
149  G4int FragmentsAMax = 0;
150  im = j;
151  for (i = j; i < Multiplicity; i++)
152  {
153  if (FragmentsA[i] <= FragmentsAMax) { continue; }
154  else
155  {
156  im = i;
157  FragmentsAMax = FragmentsA[im];
158  }
159  }
160 
161  if (im != j)
162  {
163  FragmentsA[im] = FragmentsA[j];
164  FragmentsA[j] = FragmentsAMax;
165  }
166  }
167 
168  return ChooseZ(Z,FragmentsA);
169 }
170 
171 
172 G4double G4StatMFMacroCanonical::ChooseA(G4int A, std::vector<G4int> & ANumbers)
173  // Determines fragments multiplicities and compute total fragment multiplicity
174 {
175  G4double multiplicity = 0.0;
176  G4int i;
177 
178  std::vector<G4double> AcumMultiplicity;
179  AcumMultiplicity.reserve(A);
180 
181  AcumMultiplicity.push_back((*(_theClusters.begin()))->GetMeanMultiplicity());
182  for (std::vector<G4VStatMFMacroCluster*>::iterator it = _theClusters.begin()+1;
183  it != _theClusters.end(); ++it)
184  {
185  AcumMultiplicity.push_back((*it)->GetMeanMultiplicity()+AcumMultiplicity.back());
186  }
187 
188  G4int CheckA;
189  do {
190  CheckA = -1;
191  G4int SumA = 0;
192  G4int ThisOne = 0;
193  multiplicity = 0.0;
194  for (i = 0; i < A; i++) ANumbers[i] = 0;
195  do {
197  for (i = 0; i < A; i++) {
198  if (RandNumber < AcumMultiplicity[i]) {
199  ThisOne = i;
200  break;
201  }
202  }
203  multiplicity++;
204  ANumbers[ThisOne] = ANumbers[ThisOne]+1;
205  SumA += ThisOne+1;
206  CheckA = A - SumA;
207 
208  } while (CheckA > 0);
209 
210  } while (CheckA < 0 || std::abs(__MeanMultiplicity - multiplicity) > std::sqrt(__MeanMultiplicity) + 1./2.);
211 
212  return multiplicity;
213 }
214 
215 
216 G4StatMFChannel * G4StatMFMacroCanonical::ChooseZ(G4int & Z,
217  std::vector<G4int> & FragmentsA)
218  //
219 {
220  G4Pow* g4pow = G4Pow::GetInstance();
221  std::vector<G4int> FragmentsZ;
222 
223  G4int DeltaZ = 0;
225  (1.0 - 1.0/std::pow(1.0+G4StatMFParameters::GetKappaCoulomb(),1./3.));
226 
227  G4int multiplicity = FragmentsA.size();
228 
229  do
230  {
231  FragmentsZ.clear();
232  G4int SumZ = 0;
233  for (G4int i = 0; i < multiplicity; i++)
234  {
235  G4int A = FragmentsA[i];
236  if (A <= 1)
237  {
238  G4double RandNumber = G4UniformRand();
239  if (RandNumber < (*_theClusters.begin())->GetZARatio())
240  {
241  FragmentsZ.push_back(1);
242  SumZ += FragmentsZ[i];
243  }
244  else FragmentsZ.push_back(0);
245  }
246  else
247  {
248  G4double RandZ;
249  G4double CC = 8.0*G4StatMFParameters::GetGamma0()+2.0*CP*g4pow->Z23(FragmentsA[i]);
250  G4double ZMean;
251  if (FragmentsA[i] > 1 && FragmentsA[i] < 5) { ZMean = 0.5*FragmentsA[i]; }
252  else ZMean = FragmentsA[i]*(4.0*G4StatMFParameters::GetGamma0()+_ChemPotentialNu)/CC;
253  G4double ZDispersion = std::sqrt(FragmentsA[i]*__MeanTemperature/CC);
254  G4int z;
255  do
256  {
257  RandZ = G4RandGauss::shoot(ZMean,ZDispersion);
258  z = static_cast<G4int>(RandZ+0.5);
259  } while (z < 0 || z > A);
260  FragmentsZ.push_back(z);
261  SumZ += z;
262  }
263  }
264  DeltaZ = Z - SumZ;
265  }
266  while (std::abs(DeltaZ) > 1);
267 
268  // DeltaZ can be 0, 1 or -1
269  G4int idx = 0;
270  if (DeltaZ < 0.0)
271  {
272  while (FragmentsZ[idx] < 1) { ++idx; }
273  }
274  FragmentsZ[idx] += DeltaZ;
275 
276  G4StatMFChannel * theChannel = new G4StatMFChannel;
277  for (G4int i = multiplicity-1; i >= 0; i--)
278  {
279  theChannel->CreateFragment(FragmentsA[i],FragmentsZ[i]);
280  }
281 
282  return theChannel;
283 }