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25 // 22 //
26 // 23 //
>> 24 // $Id: G4StatMFChannel.cc,v 1.5 2005/06/04 13:27:48 jwellisc Exp $
>> 25 // GEANT4 tag $Name: geant4-07-01 $
27 // 26 //
28 // Hadronic Process: Nuclear De-excitations 27 // Hadronic Process: Nuclear De-excitations
29 // by V. Lara 28 // by V. Lara
30 // <<
31 // Modified: <<
32 // 25.07.08 I.Pshenichnov (in collaboration wi <<
33 // Mishustin (FIAS, Frankfurt, INR, M <<
34 // Moscow, pshenich@fias.uni-frankfur <<
35 <<
36 #include <numeric> <<
37 29
38 #include "G4StatMFChannel.hh" 30 #include "G4StatMFChannel.hh"
39 #include "G4PhysicalConstants.hh" <<
40 #include "G4HadronicException.hh" 31 #include "G4HadronicException.hh"
41 #include "Randomize.hh" << 32 #include <numeric>
42 #include "G4Pow.hh" << 33
43 #include "G4Exp.hh" << 34 class SumCoulombEnergy : public std::binary_function<G4double,G4double,G4double>
44 #include "G4RandomDirection.hh" << 35 {
45 << 36 public:
46 G4StatMFChannel::G4StatMFChannel() : << 37 SumCoulombEnergy() : total(0.0) {}
47 _NumOfNeutralFragments(0), << 38 G4double operator() (G4double& , G4StatMFFragment*& frag)
48 _NumOfChargedFragments(0) << 39 {
49 { << 40 total += frag->GetCoulombEnergy();
50 Pos.resize(8); << 41 return total;
51 Vel.resize(8); << 42 }
52 Accel.resize(8); << 43
53 } << 44 G4double GetTotal() { return total; }
54 << 45 public:
55 G4StatMFChannel::~G4StatMFChannel() << 46 G4double total;
56 { << 47 };
57 if (!_theFragments.empty()) { << 48
58 std::for_each(_theFragments.begin(),_theFr << 49
59 DeleteFragment()); << 50
60 } << 51
>> 52
>> 53 // Copy constructor
>> 54 G4StatMFChannel::G4StatMFChannel(const G4StatMFChannel & )
>> 55 {
>> 56 throw G4HadronicException(__FILE__, __LINE__, "G4StatMFChannel::copy_constructor meant to not be accessable");
61 } 57 }
62 58
>> 59 // Operators
>> 60
>> 61 G4StatMFChannel & G4StatMFChannel::
>> 62 operator=(const G4StatMFChannel & )
>> 63 {
>> 64 throw G4HadronicException(__FILE__, __LINE__, "G4StatMFChannel::operator= meant to not be accessable");
>> 65 return *this;
>> 66 }
>> 67
>> 68
>> 69 G4bool G4StatMFChannel::operator==(const G4StatMFChannel & ) const
>> 70 {
>> 71 // throw G4HadronicException(__FILE__, __LINE__, "G4StatMFChannel::operator== meant to not be accessable");
>> 72 return false;
>> 73 }
>> 74
>> 75
>> 76 G4bool G4StatMFChannel::operator!=(const G4StatMFChannel & ) const
>> 77 {
>> 78 // throw G4HadronicException(__FILE__, __LINE__, "G4StatMFChannel::operator!= meant to not be accessable");
>> 79 return true;
>> 80 }
>> 81
>> 82
63 G4bool G4StatMFChannel::CheckFragments(void) 83 G4bool G4StatMFChannel::CheckFragments(void)
64 { 84 {
65 std::deque<G4StatMFFragment*>::iterator i; << 85 std::deque<G4StatMFFragment*>::iterator i;
66 for (i = _theFragments.begin(); << 86 for (i = _theFragments.begin();
67 i != _theFragments.end(); ++i) << 87 i != _theFragments.end(); ++i)
68 { << 88 {
69 G4int A = (*i)->GetA(); << 89 G4int A = static_cast<G4int>((*i)->GetA());
70 G4int Z = (*i)->GetZ(); << 90 G4int Z = static_cast<G4int>((*i)->GetZ());
71 if ( (A > 1 && (Z > A || Z <= 0)) || (A= << 91 if (A > 1 && (Z >= A || Z <= 0) || (A==1 && Z > A) || A <= 0) return false;
72 } 92 }
>> 93
73 return true; 94 return true;
74 } 95 }
75 96
76 void G4StatMFChannel::CreateFragment(G4int A, << 97
77 // Create a new fragment. << 98
78 // Fragments are automatically sorted: first c << 99
79 // then neutral ones. << 100 void G4StatMFChannel::CreateFragment(const G4double A, const G4double Z)
80 { << 101 // Create a new fragment.
81 if (Z <= 0.5) { << 102 // Fragments are automatically sorted: first charged fragments,
82 _theFragments.push_back(new G4StatMFFragme << 103 // then neutral ones.
83 _NumOfNeutralFragments++; << 104 {
84 } else { << 105 if (Z <= 0.5) {
85 _theFragments.push_front(new G4StatMFFragm << 106 _theFragments.push_back(new G4StatMFFragment(static_cast<G4int>(A),static_cast<G4int>(Z)));
86 _NumOfChargedFragments++; << 107 _NumOfNeutralFragments++;
87 } << 108 } else {
>> 109 _theFragments.push_front(new G4StatMFFragment(static_cast<G4int>(A),static_cast<G4int>(Z)));
>> 110 _NumOfChargedFragments++;
>> 111 }
88 112
89 return; << 113 return;
90 } 114 }
91 115
>> 116
92 G4double G4StatMFChannel::GetFragmentsCoulombE 117 G4double G4StatMFChannel::GetFragmentsCoulombEnergy(void)
93 { 118 {
94 G4double Coulomb = << 119 G4double Coulomb = std::accumulate(_theFragments.begin(),_theFragments.end(),
95 std::accumulate(_theFragments.begin(),_the << 120 0.0,SumCoulombEnergy());
96 0.0, << 121 // G4double Coulomb = 0.0;
97 [](const G4double& running << 122 // for (unsigned int i = 0;i < _theFragments.size(); i++)
98 G4StatMFFragment*& frag << 123 // Coulomb += _theFragments[i]->GetCoulombEnergy();
99 { << 124 return Coulomb;
100 return running_total + f <<
101 } ); <<
102 // G4double Coulomb = 0.0; <<
103 // for (unsigned int i = 0;i < _theFrag <<
104 // Coulomb += _theFragments[i]->GetCoulom <<
105 return Coulomb; <<
106 } 125 }
107 126
108 G4double G4StatMFChannel::GetFragmentsEnergy(G << 127
>> 128
>> 129 G4double G4StatMFChannel::GetFragmentsEnergy(const G4double T) const
109 { 130 {
110 G4double Energy = 0.0; << 131 G4double Energy = 0.0;
111 132
112 G4double TranslationalEnergy = 1.5*T*_theFra << 133 G4double TranslationalEnergy = (3./2.)*T*static_cast<G4double>(_theFragments.size());
113 134
114 std::deque<G4StatMFFragment*>::const_iterato << 135 std::deque<G4StatMFFragment*>::const_iterator i;
115 for (i = _theFragments.begin(); i != _theFra << 136 for (i = _theFragments.begin(); i != _theFragments.end(); ++i)
116 { << 137 {
117 Energy += (*i)->GetEnergy(T); << 138 Energy += (*i)->GetEnergy(T);
118 } << 139 }
119 return Energy + TranslationalEnergy; << 140 return Energy + TranslationalEnergy;
120 } 141 }
121 142
122 G4FragmentVector * G4StatMFChannel::GetFragmen << 143 G4FragmentVector * G4StatMFChannel::GetFragments(const G4double anA,
123 G4int anZ, << 144 const G4double anZ,
124 G4double T) << 145 const G4double T)
>> 146 //
125 { 147 {
126 // calculate momenta of charged fragments << 148 // calculate momenta of charged fragments
127 CoulombImpulse(anA,anZ,T); << 149 CoulombImpulse(anA,anZ,T);
128 150
129 // calculate momenta of neutral fragments << 151 // calculate momenta of neutral fragments
130 FragmentsMomenta(_NumOfNeutralFragments, _Nu << 152 FragmentsMomenta(_NumOfNeutralFragments, _NumOfChargedFragments, T);
>> 153
131 154
132 G4FragmentVector * theResult = new G4Fragmen << 155 G4FragmentVector * theResult = new G4FragmentVector;
133 std::deque<G4StatMFFragment*>::iterator i; << 156 std::deque<G4StatMFFragment*>::iterator i;
134 for (i = _theFragments.begin(); i != _theFra << 157 for (i = _theFragments.begin(); i != _theFragments.end(); ++i)
135 theResult->push_back((*i)->GetFragment(T)) << 158 theResult->push_back((*i)->GetFragment(T));
>> 159
>> 160 return theResult;
136 161
137 return theResult; <<
138 } 162 }
139 163
140 void G4StatMFChannel::CoulombImpulse(G4int anA << 164
141 // Aafter breakup, fragments fly away under Co << 165
142 // This method calculates asymptotic fragments << 166 void G4StatMFChannel::CoulombImpulse(const G4double anA, const G4double anZ, const G4double T)
>> 167 // Aafter breakup, fragments fly away under Coulomb field.
>> 168 // This method calculates asymptotic fragments momenta.
143 { 169 {
144 // First, we have to place the fragments ins << 170 // First, we have to place the fragments inside of the original nucleus volume
145 PlaceFragments(anA); << 171 PlaceFragments(anA);
146 172
147 // Second, we sample initial charged fragmen << 173 // Second, we sample initial charged fragments momenta. There are
148 // _NumOfChargedFragments charged fragments << 174 // _NumOfChargedFragments charged fragments and they start at the begining
149 // of the vector _theFragments (i.e. 0) << 175 // of the vector _theFragments (i.e. 0)
150 FragmentsMomenta(_NumOfChargedFragments, 0, << 176 FragmentsMomenta(_NumOfChargedFragments, 0, T);
151 177
152 // Third, we have to figure out the asymptot << 178 // Third, we have to figure out the asymptotic momenta of charged fragments
153 // For taht we have to solve equations of mo << 179 // For taht we have to solve equations of motion for fragments
154 SolveEqOfMotion(anA,anZ,T); << 180 SolveEqOfMotion(anA,anZ,T);
155 181
156 return; << 182 return;
157 } 183 }
158 184
159 void G4StatMFChannel::PlaceFragments(G4int anA <<
160 // This gives the position of fragments at the <<
161 // Fragments positions are sampled inside prol <<
162 { <<
163 G4Pow* g4calc = G4Pow::GetInstance(); <<
164 const G4double R0 = G4StatMFParameters::Getr <<
165 G4double Rsys = 2.0*R0*g4calc->Z13(anA); <<
166 185
167 G4bool TooMuchIterations; << 186
168 do << 187 void G4StatMFChannel::PlaceFragments(const G4double anA)
169 { << 188 // This gives the position of fragments at the breakup instant.
170 TooMuchIterations = false; << 189 // Fragments positions are sampled inside prolongated ellipsoid.
>> 190 {
>> 191 const G4double R0 = G4StatMFParameters::Getr0();
>> 192 const G4double Rsys = 2.0*R0*std::pow(anA,1./3.);
>> 193
>> 194 G4bool TooMuchIterations;
>> 195 do
>> 196 {
>> 197 TooMuchIterations = false;
171 198
172 // Sample the position of the first frag << 199 // Sample the position of the first fragment
173 G4double R = (Rsys - R0*g4calc->Z13(_the << 200 G4double R = (Rsys - R0*std::pow(_theFragments[0]->GetA(),1./3.))*
174 g4calc->A13(G4UniformRand()); << 201 std::pow(G4UniformRand(),1./3.);
175 _theFragments[0]->SetPosition(R*G4Random << 202 _theFragments[0]->SetPosition(IsotropicVector(R));
176 203
177 204
178 // Sample the position of the remaining << 205 // Sample the position of the remaining fragments
179 G4bool ThereAreOverlaps = false; << 206 G4bool ThereAreOverlaps = false;
180 std::deque<G4StatMFFragment*>::iterator << 207 std::deque<G4StatMFFragment*>::iterator i;
181 for (i = _theFragments.begin()+1; i != _ << 208 for (i = _theFragments.begin()+1; i != _theFragments.end(); ++i)
182 { << 209 {
183 G4int counter = 0; << 210 G4int counter = 0;
184 do << 211 do
185 { << 212 {
186 R = (Rsys - R0*g4calc->Z13((*i)->GetA( << 213 R = (Rsys - R0*std::pow((*i)->GetA(),1./3.))*std::pow(G4UniformRand(),1./3.);
187 (*i)->SetPosition(R*G4RandomDirection( << 214 (*i)->SetPosition(IsotropicVector(R));
188 215
189 // Check that there are not overlappin << 216 // Check that there are not overlapping fragments
190 std::deque<G4StatMFFragment*>::iterato << 217 std::deque<G4StatMFFragment*>::iterator j;
191 for (j = _theFragments.begin(); j != i << 218 for (j = _theFragments.begin(); j != i; ++j)
192 { << 219 {
193 G4ThreeVector FragToFragVector = << 220 G4ThreeVector FragToFragVector = (*i)->GetPosition() - (*j)->GetPosition();
194 (*i)->GetPosition() - (*j)->GetPositio << 221 G4double Rmin = R0*(std::pow((*i)->GetA(),1./3.) +
195 G4double Rmin = R0*(g4calc->Z13((*i)->Ge << 222 std::pow((*j)->GetA(),1./3));
196 g4calc->Z13((*j)->GetA())); << 223 if (ThereAreOverlaps = (FragToFragVector.mag2() < Rmin*Rmin)) break;
197 if ( (ThereAreOverlaps = (FragToFragVect << 224 }
198 { break; } << 225 counter++;
199 } << 226 } while (ThereAreOverlaps && counter < 1000);
200 counter++; <<
201 // Loop checking, 05-Aug-2015, Vladimi <<
202 } while (ThereAreOverlaps && counter < 1 <<
203 227
204 if (counter >= 1000) << 228 if (counter >= 1000)
205 { << 229 {
206 TooMuchIterations = true; << 230 TooMuchIterations = true;
207 break; << 231 break;
208 } << 232 }
209 } << 233 }
210 // Loop checking, 05-Aug-2015, Vladimir <<
211 } while (TooMuchIterations); 234 } while (TooMuchIterations);
>> 235
212 return; 236 return;
213 } 237 }
214 238
215 void G4StatMFChannel::FragmentsMomenta(G4int N << 239
216 G4double T) << 240 void G4StatMFChannel::FragmentsMomenta(const G4int NF, const G4int idx,
217 // Calculate fragments momenta at the breakup << 241 const G4double T)
218 // Fragment kinetic energies are calculated ac << 242 // Calculate fragments momenta at the breakup instant
219 // Boltzmann distribution at given temperature << 243 // Fragment kinetic energies are calculated according to the
220 // NF is number of fragments << 244 // Boltzmann distribution at given temperature.
221 // idx is index of first fragment << 245 // NF is number of fragments
>> 246 // idx is index of first fragment
222 { 247 {
223 G4double KinE = 1.5*T*NF; << 248 G4double KinE = (3./2.)*T*static_cast<G4double>(NF);
224 G4ThreeVector p(0.,0.,0.); <<
225 249
226 if (NF <= 0) return; << 250 G4ThreeVector p;
227 else if (NF == 1) << 251
228 { << 252 if (NF <= 0) return;
229 // We have only one fragment to deal wit << 253 else if (NF == 1)
230 p = std::sqrt(2.0*_theFragments[idx]->Ge << 254 {
231 *G4RandomDirection(); << 255 // We have only one fragment to deal with
232 _theFragments[idx]->SetMomentum(p); << 256 p = IsotropicVector(std::sqrt(2.0*_theFragments[idx]->GetNuclearMass()*KinE));
233 } << 257 _theFragments[idx]->SetMomentum(p);
234 else if (NF == 2) << 258 }
235 { << 259 else if (NF == 2)
236 // We have only two fragment to deal wit << 260 {
237 G4double M1 = _theFragments[idx]->GetNuc << 261 // We have only two fragment to deal with
238 G4double M2 = _theFragments[idx+1]->GetN << 262 G4double M1 = _theFragments[idx]->GetNuclearMass();
239 p = std::sqrt(2.0*KinE*(M1*M2)/(M1+M2))* << 263 G4double M2 = _theFragments[idx+1]->GetNuclearMass();
240 _theFragments[idx]->SetMomentum(p); << 264 p = IsotropicVector(std::sqrt(2.0*KinE*(M1*M2)/(M1+M2)));
241 _theFragments[idx+1]->SetMomentum(-p); << 265 _theFragments[idx]->SetMomentum(p);
242 } << 266 _theFragments[idx+1]->SetMomentum(-p);
243 else << 267 }
244 { << 268 else
245 // We have more than two fragments << 269 {
246 G4double AvailableE; << 270 // We have more than two fragments
247 G4int i1,i2; << 271 G4double AvailableE;
248 G4double SummedE; << 272 G4int i1,i2;
249 G4ThreeVector SummedP(0.,0.,0.); << 273 G4double SummedE;
250 do << 274 G4ThreeVector SummedP;
251 { << 275 do
252 // Fisrt sample momenta of NF-2 fragments << 276 {
253 // according to Boltzmann distribution << 277 // Fisrt sample momenta of NF-2 fragments
254 AvailableE = 0.0; << 278 // according to Boltzmann distribution
255 SummedE = 0.0; << 279 AvailableE = 0.0;
256 SummedP.setX(0.0);SummedP.setY(0.0);Summed << 280 SummedE = 0.0;
257 for (G4int i = idx; i < idx+NF-2; ++i) << 281 SummedP.setX(0.0);SummedP.setY(0.0);SummedP.setZ(0.0);
258 { << 282 for (G4int i = idx; i < idx+NF-2; i++)
259 G4double E; << 283 {
260 G4double RandE; << 284 G4double E;
261 do << 285 G4double RandE;
262 { << 286 G4double Boltzmann;
263 E = 9.0*G4UniformRand(); << 287 do
264 RandE = std::sqrt(0.5/E)*G4Exp(E-0.5)*G4 << 288 {
265 } << 289 E = 9.0*T*G4UniformRand();
266 // Loop checking, 05-Aug-2015, Vladimi << 290 Boltzmann = std::sqrt(E)*std::exp(-E/T);
267 while (RandE > 1.0); << 291 RandE = std::sqrt(T/2.)*std::exp(-0.5)*G4UniformRand();
268 E *= T; << 292 }
269 p = std::sqrt(2.0*E*_theFragments[i]-> << 293 while (RandE > Boltzmann);
270 *G4RandomDirection(); << 294 p = IsotropicVector(std::sqrt(2.0*E*_theFragments[i]->GetNuclearMass()));
271 _theFragments[i]->SetMomentum(p); << 295 _theFragments[i]->SetMomentum(p);
272 SummedE += E; << 296 SummedE += E;
273 SummedP += p; << 297 SummedP += p;
274 } << 298 }
275 // Calculate momenta of last two fragments << 299 // Calculate momenta of last two fragments in such a way
276 // that constraints are satisfied << 300 // that constraints are satisfied
277 i1 = idx+NF-2; // before last fragment in << 301 i1 = idx+NF-2; // before last fragment index
278 i2 = idx+NF-1; // last fragment index << 302 i2 = idx+NF-1; // last fragment index
279 p = -SummedP; << 303 p = -SummedP;
280 AvailableE = KinE - SummedE; << 304 AvailableE = KinE - SummedE;
281 // Available Kinetic Energy should be shar << 305 // Available Kinetic Energy should be shared between two last fragments
282 } << 306 }
283 // Loop checking, 05-Aug-2015, Vladimir << 307 while (AvailableE <= p.mag2()/(2.0*(_theFragments[i1]->GetNuclearMass()+
284 while (AvailableE <= p.mag2()/(2.0*(_the << 308 _theFragments[i2]->GetNuclearMass())));
285 _theFragments[i2]->GetNuclearMass( << 309
286 G4double H = 1.0 + _theFragments[i2]->Ge << 310 G4double H = 1.0 + _theFragments[i2]->GetNuclearMass()/_theFragments[i1]->GetNuclearMass();
287 /_theFragments[i1]->GetNuclearMass(); << 311 G4double CTM12 = H*(1.0 - 2.0*_theFragments[i2]->GetNuclearMass()*AvailableE/p.mag2());
288 G4double CTM12 = H*(1.0 - 2.0*_theFragme << 312 G4double CosTheta1;
289 *AvailableE/p.mag2()); << 313 G4double Sign;
290 G4double CosTheta1; <<
291 G4double Sign; <<
292 <<
293 if (CTM12 > 1.) {CosTheta1 = 1.;} <<
294 else { <<
295 do 314 do
296 { 315 {
297 do 316 do
298 { 317 {
299 CosTheta1 = 1.0 - 2.0*G4UniformRand(); 318 CosTheta1 = 1.0 - 2.0*G4UniformRand();
300 } 319 }
301 // Loop checking, 05-Aug-2015, Vladimir <<
302 while (CosTheta1*CosTheta1 < CTM12); 320 while (CosTheta1*CosTheta1 < CTM12);
303 } 321 }
304 // Loop checking, 05-Aug-2015, Vladimir Ivan <<
305 while (CTM12 >= 0.0 && CosTheta1 < 0.0); 322 while (CTM12 >= 0.0 && CosTheta1 < 0.0);
306 } <<
307 323
308 if (CTM12 < 0.0) Sign = 1.0; << 324 if (CTM12 < 0.0) Sign = 1.0;
309 else if (G4UniformRand() <= 0.5) Sign = << 325 else if (G4UniformRand() <= 0.5) Sign = -1.0;
310 else Sign = 1.0; << 326 else Sign = 1.0;
311 327
312 G4double P1 = (p.mag()*CosTheta1+Sign*st <<
313 *(CosTheta1*CosTheta1-CTM12) <<
314 G4double P2 = std::sqrt(P1*P1+p.mag2() - <<
315 G4double Phi = twopi*G4UniformRand(); <<
316 G4double SinTheta1 = std::sqrt(1.0 - Cos <<
317 G4double CosPhi1 = std::cos(Phi); <<
318 G4double SinPhi1 = std::sin(Phi); <<
319 G4double CosPhi2 = -CosPhi1; <<
320 G4double SinPhi2 = -SinPhi1; <<
321 G4double CosTheta2 = (p.mag2() + P2*P2 - <<
322 G4double SinTheta2 = 0.0; <<
323 if (CosTheta2 > -1.0 && CosTheta2 < 1.0) <<
324 SinTheta2 = std::sqrt(1.0 - CosTheta2*CosThe <<
325 } <<
326 G4ThreeVector p1(P1*SinTheta1*CosPhi1,P1 <<
327 G4ThreeVector p2(P2*SinTheta2*CosPhi2,P2 <<
328 G4ThreeVector b(1.0,0.0,0.0); <<
329 <<
330 p1 = RotateMomentum(p,b,p1); <<
331 p2 = RotateMomentum(p,b,p2); <<
332 <<
333 SummedP += p1 + p2; <<
334 SummedE += p1.mag2()/(2.0*_theFragments[ <<
335 p2.mag2()/(2.0*_theFragments[i2]->GetNuclear <<
336 328
337 _theFragments[i1]->SetMomentum(p1); << 329 G4double P1 = (p.mag()*CosTheta1+Sign*std::sqrt(p.mag2()*(CosTheta1*CosTheta1-CTM12)))/H;
338 _theFragments[i2]->SetMomentum(p2); << 330 G4double P2 = std::sqrt(P1*P1+p.mag2() - 2.0*P1*p.mag()*CosTheta1);
>> 331 G4double Phi = twopi*G4UniformRand();
>> 332 G4double SinTheta1 = std::sqrt(1.0 - CosTheta1*CosTheta1);
>> 333 G4double CosPhi1 = std::cos(Phi);
>> 334 G4double SinPhi1 = std::sin(Phi);
>> 335 G4double CosPhi2 = -CosPhi1;
>> 336 G4double SinPhi2 = -SinPhi1;
>> 337 G4double CosTheta2 = (p.mag2() + P2*P2 - P1*P1)/(2.0*p.mag()*P2);
>> 338 G4double SinTheta2 = 0.0;
>> 339 if (CosTheta2 > -1.0 && CosTheta2 < 1.0) SinTheta2 = std::sqrt(1.0 - CosTheta2*CosTheta2);
>> 340
>> 341 G4ThreeVector p1(P1*SinTheta1*CosPhi1,P1*SinTheta1*SinPhi1,P1*CosTheta1);
>> 342 G4ThreeVector p2(P2*SinTheta2*CosPhi2,P2*SinTheta2*SinPhi2,P2*CosTheta2);
>> 343 G4ThreeVector b(1.0,0.0,0.0);
>> 344
>> 345 p1 = RotateMomentum(p,b,p1);
>> 346 p2 = RotateMomentum(p,b,p2);
>> 347
>> 348 SummedP += p1 + p2;
>> 349 SummedE += p1.mag2()/(2.0*_theFragments[i1]->GetNuclearMass()) +
>> 350 p2.mag2()/(2.0*_theFragments[i2]->GetNuclearMass());
339 351
340 } << 352 _theFragments[i1]->SetMomentum(p1);
341 return; << 353 _theFragments[i2]->SetMomentum(p2);
>> 354
>> 355 }
>> 356
>> 357 return;
342 } 358 }
343 359
344 void G4StatMFChannel::SolveEqOfMotion(G4int an << 360
345 // This method will find a solution of Newton' << 361 void G4StatMFChannel::SolveEqOfMotion(const G4double anA, const G4double anZ, const G4double T)
346 // for fragments in the self-consistent time-d << 362 // This method will find a solution of Newton's equation of motion
347 { << 363 // for fragments in the self-consistent time-dependent Coulomb field
348 G4Pow* g4calc = G4Pow::GetInstance(); << 364 {
349 G4double CoulombEnergy = 0.6*CLHEP::elm_coup << 365 G4double CoulombEnergy = (3./5.)*(elm_coupling*anZ*anZ)*
350 g4calc->A13(1.0+G4StatMFParameters::GetKap << 366 std::pow(1.0+G4StatMFParameters::GetKappaCoulomb(),1./3.)/
351 (G4StatMFParameters::Getr0()*g4calc->Z13(a << 367 (G4StatMFParameters::Getr0()*std::pow(anA,1./3.))
>> 368 - GetFragmentsCoulombEnergy();
352 if (CoulombEnergy <= 0.0) return; 369 if (CoulombEnergy <= 0.0) return;
353 370
354 G4int Iterations = 0; 371 G4int Iterations = 0;
355 G4double TimeN = 0.0; 372 G4double TimeN = 0.0;
356 G4double TimeS = 0.0; 373 G4double TimeS = 0.0;
357 G4double DeltaTime = 10.0; 374 G4double DeltaTime = 10.0;
358 if (_NumOfChargedFragments > (G4int)Pos.size << 375
359 Pos.resize(_NumOfChargedFragments); << 376 G4ThreeVector * Pos = new G4ThreeVector[_NumOfChargedFragments];
360 Vel.resize(_NumOfChargedFragments); << 377 G4ThreeVector * Vel = new G4ThreeVector[_NumOfChargedFragments];
361 Accel.resize(_NumOfChargedFragments); << 378 G4ThreeVector * Accel = new G4ThreeVector[_NumOfChargedFragments];
362 } <<
363 379
364 G4int i; 380 G4int i;
365 for (i = 0; i < _NumOfChargedFragments; ++i) << 381 for (i = 0; i < _NumOfChargedFragments; i++)
366 { 382 {
367 Vel[i] = (1.0/(_theFragments[i]->GetNucl 383 Vel[i] = (1.0/(_theFragments[i]->GetNuclearMass()))*
368 _theFragments[i]->GetMomentum(); 384 _theFragments[i]->GetMomentum();
369 Pos[i] = _theFragments[i]->GetPosition() 385 Pos[i] = _theFragments[i]->GetPosition();
370 } 386 }
>> 387
>> 388 do
>> 389 {
371 390
372 G4ThreeVector distance(0.,0.,0.); << 391 G4ThreeVector distance;
373 G4ThreeVector force(0.,0.,0.); << 392 G4ThreeVector force;
374 G4ThreeVector SavedVel(0.,0.,0.); << 393
375 do { << 394 for (i = 0; i < _NumOfChargedFragments; i++)
376 for (i = 0; i < _NumOfChargedFragments; ++ << 395 {
377 { << 396 force.setX(0.0); force.setY(0.0); force.setZ(0.0);
378 force.set(0.,0.,0.); << 397 for (G4int j = 0; j < _NumOfChargedFragments; j++)
379 for (G4int j = 0; j < _NumOfChargedFragments << 398 {
380 { << 399 if (i != j)
381 if (i != j) << 400 {
382 { << 401 distance = Pos[i] - Pos[j];
383 distance = Pos[i] - Pos[j]; << 402 force += (elm_coupling*(_theFragments[i]->GetZ()*_theFragments[j]->GetZ())/
384 force += (_theFragments[i]->GetZ()*_theFra << 403 (distance.mag2()*distance.mag()))*distance;
385 (distance.mag2()*distance.mag()))*dist << 404 }
386 } << 405 }
387 } << 406 Accel[i] = (1./(_theFragments[i]->GetNuclearMass()))*force;
388 Accel[i] = CLHEP::elm_coupling*CLHEP::fermi* << 407 }
389 } <<
390 408
391 TimeN = TimeS + DeltaTime; << 409 TimeN = TimeS + DeltaTime;
392 410
393 for ( i = 0; i < _NumOfChargedFragments; + << 411 G4ThreeVector SavedVel;
394 { << 412 for ( i = 0; i < _NumOfChargedFragments; i++)
395 SavedVel = Vel[i]; << 413 {
396 Vel[i] += Accel[i]*(TimeN-TimeS); << 414 SavedVel = Vel[i];
397 Pos[i] += (SavedVel+Vel[i])*(TimeN-TimeS)*0. << 415 Vel[i] += Accel[i]*(TimeN-TimeS);
398 } << 416 Pos[i] += (SavedVel+Vel[i])*(TimeN-TimeS)*0.5;
399 TimeS = TimeN; << 417 }
400 << 418
401 // Loop checking, 05-Aug-2015, Vladimir Iv << 419 // if (Iterations >= 50 && Iterations < 75) DeltaTime = 4.;
402 } while (Iterations++ < 100); << 420 // else if (Iterations >= 75) DeltaTime = 10.;
>> 421
>> 422 TimeS = TimeN;
>> 423
>> 424 }
>> 425 while (Iterations++ < 100);
403 426
404 // Summed fragment kinetic energy 427 // Summed fragment kinetic energy
405 G4double TotalKineticEnergy = 0.0; 428 G4double TotalKineticEnergy = 0.0;
406 for (i = 0; i < _NumOfChargedFragments; ++i) << 429 for (i = 0; i < _NumOfChargedFragments; i++)
407 { 430 {
408 TotalKineticEnergy += _theFragments[i]-> 431 TotalKineticEnergy += _theFragments[i]->GetNuclearMass()*
409 0.5*Vel[i].mag2(); 432 0.5*Vel[i].mag2();
410 } 433 }
411 // Scaling of fragment velocities 434 // Scaling of fragment velocities
412 G4double KineticEnergy = 1.5*_NumOfChargedFr << 435 G4double KineticEnergy = (3./2.)*static_cast<G4double>(_theFragments.size())*T;
413 G4double Eta = std::pow(( CoulombEnergy + Ki << 436 G4double Eta = ( CoulombEnergy + KineticEnergy ) / TotalKineticEnergy;
414 << 437 for (i = 0; i < _NumOfChargedFragments; i++)
>> 438 {
>> 439 Vel[i] *= Eta;
>> 440 }
>> 441
415 // Finally calculate fragments momenta 442 // Finally calculate fragments momenta
416 for (i = 0; i < _NumOfChargedFragments; ++i) << 443 for (i = 0; i < _NumOfChargedFragments; i++)
417 { 444 {
418 _theFragments[i]->SetMomentum((_theFragm << 445 _theFragments[i]->SetMomentum(_theFragments[i]->GetNuclearMass()*Vel[i]);
419 } 446 }
>> 447
>> 448 // garbage collection
>> 449 delete [] Pos;
>> 450 delete [] Vel;
>> 451 delete [] Accel;
>> 452
420 return; 453 return;
421 } 454 }
422 455
>> 456
>> 457
423 G4ThreeVector G4StatMFChannel::RotateMomentum( 458 G4ThreeVector G4StatMFChannel::RotateMomentum(G4ThreeVector Pa,
424 G4ThreeVector V, G4ThreeVector 459 G4ThreeVector V, G4ThreeVector P)
425 // Rotates a 3-vector P to close momentum 460 // Rotates a 3-vector P to close momentum triangle Pa + V + P = 0
426 { 461 {
427 G4ThreeVector U = Pa.unit(); 462 G4ThreeVector U = Pa.unit();
428 463
429 G4double Alpha1 = U * V; 464 G4double Alpha1 = U * V;
430 465
431 G4double Alpha2 = std::sqrt(V.mag2() - Alpha 466 G4double Alpha2 = std::sqrt(V.mag2() - Alpha1*Alpha1);
432 467
433 G4ThreeVector N = (1./Alpha2)*U.cross(V); 468 G4ThreeVector N = (1./Alpha2)*U.cross(V);
434 469
435 G4ThreeVector RotatedMomentum( 470 G4ThreeVector RotatedMomentum(
436 ( (V.x() - Alpha1*U.x())/Alpha2 ) * P. 471 ( (V.x() - Alpha1*U.x())/Alpha2 ) * P.x() + N.x() * P.y() + U.x() * P.z(),
437 ( (V.y() - Alpha1*U.y())/Alpha2 ) * P. 472 ( (V.y() - Alpha1*U.y())/Alpha2 ) * P.x() + N.y() * P.y() + U.y() * P.z(),
438 ( (V.z() - Alpha1*U.z())/Alpha2 ) * P. 473 ( (V.z() - Alpha1*U.z())/Alpha2 ) * P.x() + N.z() * P.y() + U.z() * P.z()
439 ); 474 );
440 return RotatedMomentum; 475 return RotatedMomentum;
441 } 476 }
442 477
>> 478
>> 479
>> 480
>> 481
>> 482 G4ThreeVector G4StatMFChannel::IsotropicVector(const G4double Magnitude)
>> 483 // Samples a isotropic random vector with a magnitud given by Magnitude.
>> 484 // By default Magnitude = 1
>> 485 {
>> 486 G4double CosTheta = 1.0 - 2.0*G4UniformRand();
>> 487 G4double SinTheta = std::sqrt(1.0 - CosTheta*CosTheta);
>> 488 G4double Phi = twopi*G4UniformRand();
>> 489 G4ThreeVector Vector(Magnitude*std::cos(Phi)*SinTheta,
>> 490 Magnitude*std::cos(Phi)*CosTheta,
>> 491 Magnitude*std::sin(Phi));
>> 492 return Vector;
>> 493 }
443 494