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26 // 26 //
>> 27 // $Id: G4StatMFChannel.cc,v 1.6 2006/06/29 20:24:45 gunter Exp $
>> 28 // GEANT4 tag $Name: geant4-08-03-patch-01 $
27 // 29 //
28 // Hadronic Process: Nuclear De-excitations 30 // Hadronic Process: Nuclear De-excitations
29 // by V. Lara 31 // 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 32
38 #include "G4StatMFChannel.hh" 33 #include "G4StatMFChannel.hh"
39 #include "G4PhysicalConstants.hh" <<
40 #include "G4HadronicException.hh" 34 #include "G4HadronicException.hh"
41 #include "Randomize.hh" << 35 #include <numeric>
42 #include "G4Pow.hh" << 36
43 #include "G4Exp.hh" << 37 class SumCoulombEnergy : public std::binary_function<G4double,G4double,G4double>
44 #include "G4RandomDirection.hh" << 38 {
45 << 39 public:
46 G4StatMFChannel::G4StatMFChannel() : << 40 SumCoulombEnergy() : total(0.0) {}
47 _NumOfNeutralFragments(0), << 41 G4double operator() (G4double& , G4StatMFFragment*& frag)
48 _NumOfChargedFragments(0) << 42 {
49 { << 43 total += frag->GetCoulombEnergy();
50 Pos.resize(8); << 44 return total;
51 Vel.resize(8); << 45 }
52 Accel.resize(8); << 46
53 } << 47 G4double GetTotal() { return total; }
54 << 48 public:
55 G4StatMFChannel::~G4StatMFChannel() << 49 G4double total;
56 { << 50 };
57 if (!_theFragments.empty()) { << 51
58 std::for_each(_theFragments.begin(),_theFr << 52
59 DeleteFragment()); << 53
60 } << 54
>> 55
>> 56 // Copy constructor
>> 57 G4StatMFChannel::G4StatMFChannel(const G4StatMFChannel & )
>> 58 {
>> 59 throw G4HadronicException(__FILE__, __LINE__, "G4StatMFChannel::copy_constructor meant to not be accessable");
61 } 60 }
62 61
>> 62 // Operators
>> 63
>> 64 G4StatMFChannel & G4StatMFChannel::
>> 65 operator=(const G4StatMFChannel & )
>> 66 {
>> 67 throw G4HadronicException(__FILE__, __LINE__, "G4StatMFChannel::operator= meant to not be accessable");
>> 68 return *this;
>> 69 }
>> 70
>> 71
>> 72 G4bool G4StatMFChannel::operator==(const G4StatMFChannel & ) const
>> 73 {
>> 74 // throw G4HadronicException(__FILE__, __LINE__, "G4StatMFChannel::operator== meant to not be accessable");
>> 75 return false;
>> 76 }
>> 77
>> 78
>> 79 G4bool G4StatMFChannel::operator!=(const G4StatMFChannel & ) const
>> 80 {
>> 81 // throw G4HadronicException(__FILE__, __LINE__, "G4StatMFChannel::operator!= meant to not be accessable");
>> 82 return true;
>> 83 }
>> 84
>> 85
63 G4bool G4StatMFChannel::CheckFragments(void) 86 G4bool G4StatMFChannel::CheckFragments(void)
64 { 87 {
65 std::deque<G4StatMFFragment*>::iterator i; << 88 std::deque<G4StatMFFragment*>::iterator i;
66 for (i = _theFragments.begin(); << 89 for (i = _theFragments.begin();
67 i != _theFragments.end(); ++i) << 90 i != _theFragments.end(); ++i)
68 { << 91 {
69 G4int A = (*i)->GetA(); << 92 G4int A = static_cast<G4int>((*i)->GetA());
70 G4int Z = (*i)->GetZ(); << 93 G4int Z = static_cast<G4int>((*i)->GetZ());
71 if ( (A > 1 && (Z > A || Z <= 0)) || (A= << 94 if (A > 1 && (Z >= A || Z <= 0) || (A==1 && Z > A) || A <= 0) return false;
72 } 95 }
>> 96
73 return true; 97 return true;
74 } 98 }
75 99
76 void G4StatMFChannel::CreateFragment(G4int A, << 100
77 // Create a new fragment. << 101
78 // Fragments are automatically sorted: first c << 102
79 // then neutral ones. << 103 void G4StatMFChannel::CreateFragment(const G4double A, const G4double Z)
80 { << 104 // Create a new fragment.
81 if (Z <= 0.5) { << 105 // Fragments are automatically sorted: first charged fragments,
82 _theFragments.push_back(new G4StatMFFragme << 106 // then neutral ones.
83 _NumOfNeutralFragments++; << 107 {
84 } else { << 108 if (Z <= 0.5) {
85 _theFragments.push_front(new G4StatMFFragm << 109 _theFragments.push_back(new G4StatMFFragment(static_cast<G4int>(A),static_cast<G4int>(Z)));
86 _NumOfChargedFragments++; << 110 _NumOfNeutralFragments++;
87 } << 111 } else {
>> 112 _theFragments.push_front(new G4StatMFFragment(static_cast<G4int>(A),static_cast<G4int>(Z)));
>> 113 _NumOfChargedFragments++;
>> 114 }
88 115
89 return; << 116 return;
90 } 117 }
91 118
>> 119
92 G4double G4StatMFChannel::GetFragmentsCoulombE 120 G4double G4StatMFChannel::GetFragmentsCoulombEnergy(void)
93 { 121 {
94 G4double Coulomb = << 122 G4double Coulomb = std::accumulate(_theFragments.begin(),_theFragments.end(),
95 std::accumulate(_theFragments.begin(),_the << 123 0.0,SumCoulombEnergy());
96 0.0, << 124 // G4double Coulomb = 0.0;
97 [](const G4double& running << 125 // for (unsigned int i = 0;i < _theFragments.size(); i++)
98 G4StatMFFragment*& frag << 126 // Coulomb += _theFragments[i]->GetCoulombEnergy();
99 { << 127 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 } 128 }
107 129
108 G4double G4StatMFChannel::GetFragmentsEnergy(G << 130
>> 131
>> 132 G4double G4StatMFChannel::GetFragmentsEnergy(const G4double T) const
109 { 133 {
110 G4double Energy = 0.0; << 134 G4double Energy = 0.0;
111 135
112 G4double TranslationalEnergy = 1.5*T*_theFra << 136 G4double TranslationalEnergy = (3./2.)*T*static_cast<G4double>(_theFragments.size());
113 137
114 std::deque<G4StatMFFragment*>::const_iterato << 138 std::deque<G4StatMFFragment*>::const_iterator i;
115 for (i = _theFragments.begin(); i != _theFra << 139 for (i = _theFragments.begin(); i != _theFragments.end(); ++i)
116 { << 140 {
117 Energy += (*i)->GetEnergy(T); << 141 Energy += (*i)->GetEnergy(T);
118 } << 142 }
119 return Energy + TranslationalEnergy; << 143 return Energy + TranslationalEnergy;
120 } 144 }
121 145
122 G4FragmentVector * G4StatMFChannel::GetFragmen << 146 G4FragmentVector * G4StatMFChannel::GetFragments(const G4double anA,
123 G4int anZ, << 147 const G4double anZ,
124 G4double T) << 148 const G4double T)
>> 149 //
125 { 150 {
126 // calculate momenta of charged fragments << 151 // calculate momenta of charged fragments
127 CoulombImpulse(anA,anZ,T); << 152 CoulombImpulse(anA,anZ,T);
128 153
129 // calculate momenta of neutral fragments << 154 // calculate momenta of neutral fragments
130 FragmentsMomenta(_NumOfNeutralFragments, _Nu << 155 FragmentsMomenta(_NumOfNeutralFragments, _NumOfChargedFragments, T);
>> 156
131 157
132 G4FragmentVector * theResult = new G4Fragmen << 158 G4FragmentVector * theResult = new G4FragmentVector;
133 std::deque<G4StatMFFragment*>::iterator i; << 159 std::deque<G4StatMFFragment*>::iterator i;
134 for (i = _theFragments.begin(); i != _theFra << 160 for (i = _theFragments.begin(); i != _theFragments.end(); ++i)
135 theResult->push_back((*i)->GetFragment(T)) << 161 theResult->push_back((*i)->GetFragment(T));
>> 162
>> 163 return theResult;
136 164
137 return theResult; <<
138 } 165 }
139 166
140 void G4StatMFChannel::CoulombImpulse(G4int anA << 167
141 // Aafter breakup, fragments fly away under Co << 168
142 // This method calculates asymptotic fragments << 169 void G4StatMFChannel::CoulombImpulse(const G4double anA, const G4double anZ, const G4double T)
>> 170 // Aafter breakup, fragments fly away under Coulomb field.
>> 171 // This method calculates asymptotic fragments momenta.
143 { 172 {
144 // First, we have to place the fragments ins << 173 // First, we have to place the fragments inside of the original nucleus volume
145 PlaceFragments(anA); << 174 PlaceFragments(anA);
146 175
147 // Second, we sample initial charged fragmen << 176 // Second, we sample initial charged fragments momenta. There are
148 // _NumOfChargedFragments charged fragments << 177 // _NumOfChargedFragments charged fragments and they start at the begining
149 // of the vector _theFragments (i.e. 0) << 178 // of the vector _theFragments (i.e. 0)
150 FragmentsMomenta(_NumOfChargedFragments, 0, << 179 FragmentsMomenta(_NumOfChargedFragments, 0, T);
151 180
152 // Third, we have to figure out the asymptot << 181 // Third, we have to figure out the asymptotic momenta of charged fragments
153 // For taht we have to solve equations of mo << 182 // For taht we have to solve equations of motion for fragments
154 SolveEqOfMotion(anA,anZ,T); << 183 SolveEqOfMotion(anA,anZ,T);
155 184
156 return; << 185 return;
157 } 186 }
158 187
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); <<
166 188
167 G4bool TooMuchIterations; << 189
168 do << 190 void G4StatMFChannel::PlaceFragments(const G4double anA)
169 { << 191 // This gives the position of fragments at the breakup instant.
170 TooMuchIterations = false; << 192 // Fragments positions are sampled inside prolongated ellipsoid.
>> 193 {
>> 194 const G4double R0 = G4StatMFParameters::Getr0();
>> 195 const G4double Rsys = 2.0*R0*std::pow(anA,1./3.);
>> 196
>> 197 G4bool TooMuchIterations;
>> 198 do
>> 199 {
>> 200 TooMuchIterations = false;
171 201
172 // Sample the position of the first frag << 202 // Sample the position of the first fragment
173 G4double R = (Rsys - R0*g4calc->Z13(_the << 203 G4double R = (Rsys - R0*std::pow(_theFragments[0]->GetA(),1./3.))*
174 g4calc->A13(G4UniformRand()); << 204 std::pow(G4UniformRand(),1./3.);
175 _theFragments[0]->SetPosition(R*G4Random << 205 _theFragments[0]->SetPosition(IsotropicVector(R));
176 206
177 207
178 // Sample the position of the remaining << 208 // Sample the position of the remaining fragments
179 G4bool ThereAreOverlaps = false; << 209 G4bool ThereAreOverlaps = false;
180 std::deque<G4StatMFFragment*>::iterator << 210 std::deque<G4StatMFFragment*>::iterator i;
181 for (i = _theFragments.begin()+1; i != _ << 211 for (i = _theFragments.begin()+1; i != _theFragments.end(); ++i)
182 { << 212 {
183 G4int counter = 0; << 213 G4int counter = 0;
184 do << 214 do
185 { << 215 {
186 R = (Rsys - R0*g4calc->Z13((*i)->GetA( << 216 R = (Rsys - R0*std::pow((*i)->GetA(),1./3.))*std::pow(G4UniformRand(),1./3.);
187 (*i)->SetPosition(R*G4RandomDirection( << 217 (*i)->SetPosition(IsotropicVector(R));
188 218
189 // Check that there are not overlappin << 219 // Check that there are not overlapping fragments
190 std::deque<G4StatMFFragment*>::iterato << 220 std::deque<G4StatMFFragment*>::iterator j;
191 for (j = _theFragments.begin(); j != i << 221 for (j = _theFragments.begin(); j != i; ++j)
192 { << 222 {
193 G4ThreeVector FragToFragVector = << 223 G4ThreeVector FragToFragVector = (*i)->GetPosition() - (*j)->GetPosition();
194 (*i)->GetPosition() - (*j)->GetPositio << 224 G4double Rmin = R0*(std::pow((*i)->GetA(),1./3.) +
195 G4double Rmin = R0*(g4calc->Z13((*i)->Ge << 225 std::pow((*j)->GetA(),1./3));
196 g4calc->Z13((*j)->GetA())); << 226 if (ThereAreOverlaps = (FragToFragVector.mag2() < Rmin*Rmin)) break;
197 if ( (ThereAreOverlaps = (FragToFragVect << 227 }
198 { break; } << 228 counter++;
199 } << 229 } while (ThereAreOverlaps && counter < 1000);
200 counter++; <<
201 // Loop checking, 05-Aug-2015, Vladimi <<
202 } while (ThereAreOverlaps && counter < 1 <<
203 230
204 if (counter >= 1000) << 231 if (counter >= 1000)
205 { << 232 {
206 TooMuchIterations = true; << 233 TooMuchIterations = true;
207 break; << 234 break;
208 } << 235 }
209 } << 236 }
210 // Loop checking, 05-Aug-2015, Vladimir <<
211 } while (TooMuchIterations); 237 } while (TooMuchIterations);
>> 238
212 return; 239 return;
213 } 240 }
214 241
215 void G4StatMFChannel::FragmentsMomenta(G4int N << 242
216 G4double T) << 243 void G4StatMFChannel::FragmentsMomenta(const G4int NF, const G4int idx,
217 // Calculate fragments momenta at the breakup << 244 const G4double T)
218 // Fragment kinetic energies are calculated ac << 245 // Calculate fragments momenta at the breakup instant
219 // Boltzmann distribution at given temperature << 246 // Fragment kinetic energies are calculated according to the
220 // NF is number of fragments << 247 // Boltzmann distribution at given temperature.
221 // idx is index of first fragment << 248 // NF is number of fragments
>> 249 // idx is index of first fragment
222 { 250 {
223 G4double KinE = 1.5*T*NF; << 251 G4double KinE = (3./2.)*T*static_cast<G4double>(NF);
224 G4ThreeVector p(0.,0.,0.); <<
225 252
226 if (NF <= 0) return; << 253 G4ThreeVector p;
227 else if (NF == 1) << 254
228 { << 255 if (NF <= 0) return;
229 // We have only one fragment to deal wit << 256 else if (NF == 1)
230 p = std::sqrt(2.0*_theFragments[idx]->Ge << 257 {
231 *G4RandomDirection(); << 258 // We have only one fragment to deal with
232 _theFragments[idx]->SetMomentum(p); << 259 p = IsotropicVector(std::sqrt(2.0*_theFragments[idx]->GetNuclearMass()*KinE));
233 } << 260 _theFragments[idx]->SetMomentum(p);
234 else if (NF == 2) << 261 }
235 { << 262 else if (NF == 2)
236 // We have only two fragment to deal wit << 263 {
237 G4double M1 = _theFragments[idx]->GetNuc << 264 // We have only two fragment to deal with
238 G4double M2 = _theFragments[idx+1]->GetN << 265 G4double M1 = _theFragments[idx]->GetNuclearMass();
239 p = std::sqrt(2.0*KinE*(M1*M2)/(M1+M2))* << 266 G4double M2 = _theFragments[idx+1]->GetNuclearMass();
240 _theFragments[idx]->SetMomentum(p); << 267 p = IsotropicVector(std::sqrt(2.0*KinE*(M1*M2)/(M1+M2)));
241 _theFragments[idx+1]->SetMomentum(-p); << 268 _theFragments[idx]->SetMomentum(p);
242 } << 269 _theFragments[idx+1]->SetMomentum(-p);
243 else << 270 }
244 { << 271 else
245 // We have more than two fragments << 272 {
246 G4double AvailableE; << 273 // We have more than two fragments
247 G4int i1,i2; << 274 G4double AvailableE;
248 G4double SummedE; << 275 G4int i1,i2;
249 G4ThreeVector SummedP(0.,0.,0.); << 276 G4double SummedE;
250 do << 277 G4ThreeVector SummedP;
251 { << 278 do
252 // Fisrt sample momenta of NF-2 fragments << 279 {
253 // according to Boltzmann distribution << 280 // Fisrt sample momenta of NF-2 fragments
254 AvailableE = 0.0; << 281 // according to Boltzmann distribution
255 SummedE = 0.0; << 282 AvailableE = 0.0;
256 SummedP.setX(0.0);SummedP.setY(0.0);Summed << 283 SummedE = 0.0;
257 for (G4int i = idx; i < idx+NF-2; ++i) << 284 SummedP.setX(0.0);SummedP.setY(0.0);SummedP.setZ(0.0);
258 { << 285 for (G4int i = idx; i < idx+NF-2; i++)
259 G4double E; << 286 {
260 G4double RandE; << 287 G4double E;
261 do << 288 G4double RandE;
262 { << 289 G4double Boltzmann;
263 E = 9.0*G4UniformRand(); << 290 do
264 RandE = std::sqrt(0.5/E)*G4Exp(E-0.5)*G4 << 291 {
265 } << 292 E = 9.0*T*G4UniformRand();
266 // Loop checking, 05-Aug-2015, Vladimi << 293 Boltzmann = std::sqrt(E)*std::exp(-E/T);
267 while (RandE > 1.0); << 294 RandE = std::sqrt(T/2.)*std::exp(-0.5)*G4UniformRand();
268 E *= T; << 295 }
269 p = std::sqrt(2.0*E*_theFragments[i]-> << 296 while (RandE > Boltzmann);
270 *G4RandomDirection(); << 297 p = IsotropicVector(std::sqrt(2.0*E*_theFragments[i]->GetNuclearMass()));
271 _theFragments[i]->SetMomentum(p); << 298 _theFragments[i]->SetMomentum(p);
272 SummedE += E; << 299 SummedE += E;
273 SummedP += p; << 300 SummedP += p;
274 } << 301 }
275 // Calculate momenta of last two fragments << 302 // Calculate momenta of last two fragments in such a way
276 // that constraints are satisfied << 303 // that constraints are satisfied
277 i1 = idx+NF-2; // before last fragment in << 304 i1 = idx+NF-2; // before last fragment index
278 i2 = idx+NF-1; // last fragment index << 305 i2 = idx+NF-1; // last fragment index
279 p = -SummedP; << 306 p = -SummedP;
280 AvailableE = KinE - SummedE; << 307 AvailableE = KinE - SummedE;
281 // Available Kinetic Energy should be shar << 308 // Available Kinetic Energy should be shared between two last fragments
282 } << 309 }
283 // Loop checking, 05-Aug-2015, Vladimir << 310 while (AvailableE <= p.mag2()/(2.0*(_theFragments[i1]->GetNuclearMass()+
284 while (AvailableE <= p.mag2()/(2.0*(_the << 311 _theFragments[i2]->GetNuclearMass())));
285 _theFragments[i2]->GetNuclearMass( << 312
286 G4double H = 1.0 + _theFragments[i2]->Ge << 313 G4double H = 1.0 + _theFragments[i2]->GetNuclearMass()/_theFragments[i1]->GetNuclearMass();
287 /_theFragments[i1]->GetNuclearMass(); << 314 G4double CTM12 = H*(1.0 - 2.0*_theFragments[i2]->GetNuclearMass()*AvailableE/p.mag2());
288 G4double CTM12 = H*(1.0 - 2.0*_theFragme << 315 G4double CosTheta1;
289 *AvailableE/p.mag2()); << 316 G4double Sign;
290 G4double CosTheta1; <<
291 G4double Sign; <<
292 <<
293 if (CTM12 > 1.) {CosTheta1 = 1.;} <<
294 else { <<
295 do 317 do
296 { 318 {
297 do 319 do
298 { 320 {
299 CosTheta1 = 1.0 - 2.0*G4UniformRand(); 321 CosTheta1 = 1.0 - 2.0*G4UniformRand();
300 } 322 }
301 // Loop checking, 05-Aug-2015, Vladimir <<
302 while (CosTheta1*CosTheta1 < CTM12); 323 while (CosTheta1*CosTheta1 < CTM12);
303 } 324 }
304 // Loop checking, 05-Aug-2015, Vladimir Ivan <<
305 while (CTM12 >= 0.0 && CosTheta1 < 0.0); 325 while (CTM12 >= 0.0 && CosTheta1 < 0.0);
306 } <<
307 326
308 if (CTM12 < 0.0) Sign = 1.0; << 327 if (CTM12 < 0.0) Sign = 1.0;
309 else if (G4UniformRand() <= 0.5) Sign = << 328 else if (G4UniformRand() <= 0.5) Sign = -1.0;
310 else Sign = 1.0; << 329 else Sign = 1.0;
311 330
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 <<
336 331
337 _theFragments[i1]->SetMomentum(p1); << 332 G4double P1 = (p.mag()*CosTheta1+Sign*std::sqrt(p.mag2()*(CosTheta1*CosTheta1-CTM12)))/H;
338 _theFragments[i2]->SetMomentum(p2); << 333 G4double P2 = std::sqrt(P1*P1+p.mag2() - 2.0*P1*p.mag()*CosTheta1);
>> 334 G4double Phi = twopi*G4UniformRand();
>> 335 G4double SinTheta1 = std::sqrt(1.0 - CosTheta1*CosTheta1);
>> 336 G4double CosPhi1 = std::cos(Phi);
>> 337 G4double SinPhi1 = std::sin(Phi);
>> 338 G4double CosPhi2 = -CosPhi1;
>> 339 G4double SinPhi2 = -SinPhi1;
>> 340 G4double CosTheta2 = (p.mag2() + P2*P2 - P1*P1)/(2.0*p.mag()*P2);
>> 341 G4double SinTheta2 = 0.0;
>> 342 if (CosTheta2 > -1.0 && CosTheta2 < 1.0) SinTheta2 = std::sqrt(1.0 - CosTheta2*CosTheta2);
>> 343
>> 344 G4ThreeVector p1(P1*SinTheta1*CosPhi1,P1*SinTheta1*SinPhi1,P1*CosTheta1);
>> 345 G4ThreeVector p2(P2*SinTheta2*CosPhi2,P2*SinTheta2*SinPhi2,P2*CosTheta2);
>> 346 G4ThreeVector b(1.0,0.0,0.0);
>> 347
>> 348 p1 = RotateMomentum(p,b,p1);
>> 349 p2 = RotateMomentum(p,b,p2);
>> 350
>> 351 SummedP += p1 + p2;
>> 352 SummedE += p1.mag2()/(2.0*_theFragments[i1]->GetNuclearMass()) +
>> 353 p2.mag2()/(2.0*_theFragments[i2]->GetNuclearMass());
339 354
340 } << 355 _theFragments[i1]->SetMomentum(p1);
341 return; << 356 _theFragments[i2]->SetMomentum(p2);
>> 357
>> 358 }
>> 359
>> 360 return;
342 } 361 }
343 362
344 void G4StatMFChannel::SolveEqOfMotion(G4int an << 363
345 // This method will find a solution of Newton' << 364 void G4StatMFChannel::SolveEqOfMotion(const G4double anA, const G4double anZ, const G4double T)
346 // for fragments in the self-consistent time-d << 365 // This method will find a solution of Newton's equation of motion
347 { << 366 // for fragments in the self-consistent time-dependent Coulomb field
348 G4Pow* g4calc = G4Pow::GetInstance(); << 367 {
349 G4double CoulombEnergy = 0.6*CLHEP::elm_coup << 368 G4double CoulombEnergy = (3./5.)*(elm_coupling*anZ*anZ)*
350 g4calc->A13(1.0+G4StatMFParameters::GetKap << 369 std::pow(1.0+G4StatMFParameters::GetKappaCoulomb(),1./3.)/
351 (G4StatMFParameters::Getr0()*g4calc->Z13(a << 370 (G4StatMFParameters::Getr0()*std::pow(anA,1./3.))
>> 371 - GetFragmentsCoulombEnergy();
352 if (CoulombEnergy <= 0.0) return; 372 if (CoulombEnergy <= 0.0) return;
353 373
354 G4int Iterations = 0; 374 G4int Iterations = 0;
355 G4double TimeN = 0.0; 375 G4double TimeN = 0.0;
356 G4double TimeS = 0.0; 376 G4double TimeS = 0.0;
357 G4double DeltaTime = 10.0; 377 G4double DeltaTime = 10.0;
358 if (_NumOfChargedFragments > (G4int)Pos.size << 378
359 Pos.resize(_NumOfChargedFragments); << 379 G4ThreeVector * Pos = new G4ThreeVector[_NumOfChargedFragments];
360 Vel.resize(_NumOfChargedFragments); << 380 G4ThreeVector * Vel = new G4ThreeVector[_NumOfChargedFragments];
361 Accel.resize(_NumOfChargedFragments); << 381 G4ThreeVector * Accel = new G4ThreeVector[_NumOfChargedFragments];
362 } <<
363 382
364 G4int i; 383 G4int i;
365 for (i = 0; i < _NumOfChargedFragments; ++i) << 384 for (i = 0; i < _NumOfChargedFragments; i++)
366 { 385 {
367 Vel[i] = (1.0/(_theFragments[i]->GetNucl 386 Vel[i] = (1.0/(_theFragments[i]->GetNuclearMass()))*
368 _theFragments[i]->GetMomentum(); 387 _theFragments[i]->GetMomentum();
369 Pos[i] = _theFragments[i]->GetPosition() 388 Pos[i] = _theFragments[i]->GetPosition();
370 } 389 }
>> 390
>> 391 do
>> 392 {
371 393
372 G4ThreeVector distance(0.,0.,0.); << 394 G4ThreeVector distance;
373 G4ThreeVector force(0.,0.,0.); << 395 G4ThreeVector force;
374 G4ThreeVector SavedVel(0.,0.,0.); << 396
375 do { << 397 for (i = 0; i < _NumOfChargedFragments; i++)
376 for (i = 0; i < _NumOfChargedFragments; ++ << 398 {
377 { << 399 force.setX(0.0); force.setY(0.0); force.setZ(0.0);
378 force.set(0.,0.,0.); << 400 for (G4int j = 0; j < _NumOfChargedFragments; j++)
379 for (G4int j = 0; j < _NumOfChargedFragments << 401 {
380 { << 402 if (i != j)
381 if (i != j) << 403 {
382 { << 404 distance = Pos[i] - Pos[j];
383 distance = Pos[i] - Pos[j]; << 405 force += (elm_coupling*(_theFragments[i]->GetZ()*_theFragments[j]->GetZ())/
384 force += (_theFragments[i]->GetZ()*_theFra << 406 (distance.mag2()*distance.mag()))*distance;
385 (distance.mag2()*distance.mag()))*dist << 407 }
386 } << 408 }
387 } << 409 Accel[i] = (1./(_theFragments[i]->GetNuclearMass()))*force;
388 Accel[i] = CLHEP::elm_coupling*CLHEP::fermi* << 410 }
389 } <<
390 411
391 TimeN = TimeS + DeltaTime; << 412 TimeN = TimeS + DeltaTime;
392 413
393 for ( i = 0; i < _NumOfChargedFragments; + << 414 G4ThreeVector SavedVel;
394 { << 415 for ( i = 0; i < _NumOfChargedFragments; i++)
395 SavedVel = Vel[i]; << 416 {
396 Vel[i] += Accel[i]*(TimeN-TimeS); << 417 SavedVel = Vel[i];
397 Pos[i] += (SavedVel+Vel[i])*(TimeN-TimeS)*0. << 418 Vel[i] += Accel[i]*(TimeN-TimeS);
398 } << 419 Pos[i] += (SavedVel+Vel[i])*(TimeN-TimeS)*0.5;
399 TimeS = TimeN; << 420 }
400 << 421
401 // Loop checking, 05-Aug-2015, Vladimir Iv << 422 // if (Iterations >= 50 && Iterations < 75) DeltaTime = 4.;
402 } while (Iterations++ < 100); << 423 // else if (Iterations >= 75) DeltaTime = 10.;
>> 424
>> 425 TimeS = TimeN;
>> 426
>> 427 }
>> 428 while (Iterations++ < 100);
403 429
404 // Summed fragment kinetic energy 430 // Summed fragment kinetic energy
405 G4double TotalKineticEnergy = 0.0; 431 G4double TotalKineticEnergy = 0.0;
406 for (i = 0; i < _NumOfChargedFragments; ++i) << 432 for (i = 0; i < _NumOfChargedFragments; i++)
407 { 433 {
408 TotalKineticEnergy += _theFragments[i]-> 434 TotalKineticEnergy += _theFragments[i]->GetNuclearMass()*
409 0.5*Vel[i].mag2(); 435 0.5*Vel[i].mag2();
410 } 436 }
411 // Scaling of fragment velocities 437 // Scaling of fragment velocities
412 G4double KineticEnergy = 1.5*_NumOfChargedFr << 438 G4double KineticEnergy = (3./2.)*static_cast<G4double>(_theFragments.size())*T;
413 G4double Eta = std::pow(( CoulombEnergy + Ki << 439 G4double Eta = ( CoulombEnergy + KineticEnergy ) / TotalKineticEnergy;
414 << 440 for (i = 0; i < _NumOfChargedFragments; i++)
>> 441 {
>> 442 Vel[i] *= Eta;
>> 443 }
>> 444
415 // Finally calculate fragments momenta 445 // Finally calculate fragments momenta
416 for (i = 0; i < _NumOfChargedFragments; ++i) << 446 for (i = 0; i < _NumOfChargedFragments; i++)
417 { 447 {
418 _theFragments[i]->SetMomentum((_theFragm << 448 _theFragments[i]->SetMomentum(_theFragments[i]->GetNuclearMass()*Vel[i]);
419 } 449 }
>> 450
>> 451 // garbage collection
>> 452 delete [] Pos;
>> 453 delete [] Vel;
>> 454 delete [] Accel;
>> 455
420 return; 456 return;
421 } 457 }
422 458
>> 459
>> 460
423 G4ThreeVector G4StatMFChannel::RotateMomentum( 461 G4ThreeVector G4StatMFChannel::RotateMomentum(G4ThreeVector Pa,
424 G4ThreeVector V, G4ThreeVector 462 G4ThreeVector V, G4ThreeVector P)
425 // Rotates a 3-vector P to close momentum 463 // Rotates a 3-vector P to close momentum triangle Pa + V + P = 0
426 { 464 {
427 G4ThreeVector U = Pa.unit(); 465 G4ThreeVector U = Pa.unit();
428 466
429 G4double Alpha1 = U * V; 467 G4double Alpha1 = U * V;
430 468
431 G4double Alpha2 = std::sqrt(V.mag2() - Alpha 469 G4double Alpha2 = std::sqrt(V.mag2() - Alpha1*Alpha1);
432 470
433 G4ThreeVector N = (1./Alpha2)*U.cross(V); 471 G4ThreeVector N = (1./Alpha2)*U.cross(V);
434 472
435 G4ThreeVector RotatedMomentum( 473 G4ThreeVector RotatedMomentum(
436 ( (V.x() - Alpha1*U.x())/Alpha2 ) * P. 474 ( (V.x() - Alpha1*U.x())/Alpha2 ) * P.x() + N.x() * P.y() + U.x() * P.z(),
437 ( (V.y() - Alpha1*U.y())/Alpha2 ) * P. 475 ( (V.y() - Alpha1*U.y())/Alpha2 ) * P.x() + N.y() * P.y() + U.y() * P.z(),
438 ( (V.z() - Alpha1*U.z())/Alpha2 ) * P. 476 ( (V.z() - Alpha1*U.z())/Alpha2 ) * P.x() + N.z() * P.y() + U.z() * P.z()
439 ); 477 );
440 return RotatedMomentum; 478 return RotatedMomentum;
441 } 479 }
442 480
>> 481
>> 482
>> 483
>> 484
>> 485 G4ThreeVector G4StatMFChannel::IsotropicVector(const G4double Magnitude)
>> 486 // Samples a isotropic random vector with a magnitud given by Magnitude.
>> 487 // By default Magnitude = 1
>> 488 {
>> 489 G4double CosTheta = 1.0 - 2.0*G4UniformRand();
>> 490 G4double SinTheta = std::sqrt(1.0 - CosTheta*CosTheta);
>> 491 G4double Phi = twopi*G4UniformRand();
>> 492 G4ThreeVector Vector(Magnitude*std::cos(Phi)*SinTheta,
>> 493 Magnitude*std::cos(Phi)*CosTheta,
>> 494 Magnitude*std::sin(Phi));
>> 495 return Vector;
>> 496 }
443 497