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26 // 23 //
>> 24 // $Id: G4CompetitiveFission.cc,v 1.3 2004/12/07 13:46:45 gunter Exp $
>> 25 // GEANT4 tag $Name: geant4-07-00-patch-01 $
>> 26 //
27 // Hadronic Process: Nuclear De-excitations 27 // Hadronic Process: Nuclear De-excitations
28 // by V. Lara (Oct 1998) 28 // by V. Lara (Oct 1998)
29 // <<
30 // J. M. Quesada (March 2009). Bugs fixed: <<
31 // - Full relativistic calculation (L <<
32 // - Fission pairing energy is includ <<
33 // Now Energy and momentum are conserved in fi <<
34 29
35 #include "G4CompetitiveFission.hh" 30 #include "G4CompetitiveFission.hh"
36 #include "G4PairingCorrection.hh" 31 #include "G4PairingCorrection.hh"
37 #include "G4ParticleMomentum.hh" << 32
38 #include "G4NuclearLevelData.hh" << 33 G4CompetitiveFission::G4CompetitiveFission() : G4VEvaporationChannel("fission")
39 #include "G4VFissionBarrier.hh" << 34 {
40 #include "G4FissionBarrier.hh" << 35 theFissionBarrierPtr = new G4FissionBarrier;
41 #include "G4FissionProbability.hh" << 36 MyOwnFissionBarrier = true;
42 #include "G4VLevelDensityParameter.hh" << 37
43 #include "G4FissionLevelDensityParameter.hh" << 38 theFissionProbabilityPtr = new G4FissionProbability;
44 #include "G4Pow.hh" << 39 MyOwnFissionProbability = true;
45 #include "Randomize.hh" << 40
46 #include "G4RandomDirection.hh" << 41 theLevelDensityPtr = new G4FissionLevelDensityParameter;
47 #include "G4PhysicalConstants.hh" << 42 MyOwnLevelDensity = true;
48 #include "G4PhysicsModelCatalog.hh" << 43
49 << 44 MaximalKineticEnergy = -1000.0*MeV;
50 G4CompetitiveFission::G4CompetitiveFission() : << 45 FissionBarrier = 0.0;
51 { << 46 FissionProbability = 0.0;
52 theFissionBarrierPtr = new G4FissionBarrier; << 47 LevelDensityParameter = 0.0;
53 theFissionProbabilityPtr = new G4FissionProb << 48 }
54 theLevelDensityPtr = new G4FissionLevelDensi << 49
55 pairingCorrection = G4NuclearLevelData::GetI << 50 G4CompetitiveFission::G4CompetitiveFission(const G4CompetitiveFission &) : G4VEvaporationChannel()
56 theSecID = G4PhysicsModelCatalog::GetModelID << 51 {
57 } 52 }
58 53
59 G4CompetitiveFission::~G4CompetitiveFission() 54 G4CompetitiveFission::~G4CompetitiveFission()
60 { 55 {
61 if (myOwnFissionBarrier) delete theFissionBa << 56 if (MyOwnFissionBarrier) delete theFissionBarrierPtr;
62 if (myOwnFissionProbability) delete theFissi << 57
63 if (myOwnLevelDensity) delete theLevelDensit << 58 if (MyOwnFissionProbability) delete theFissionProbabilityPtr;
64 } << 59
65 << 60 if (MyOwnLevelDensity) delete theLevelDensityPtr;
66 void G4CompetitiveFission::Initialise() << 61 }
67 { << 62
68 if (!isInitialised) { << 63 const G4CompetitiveFission & G4CompetitiveFission::operator=(const G4CompetitiveFission &)
69 isInitialised = true; << 64 {
70 G4VEvaporationChannel::Initialise(); << 65 throw G4HadronicException(__FILE__, __LINE__, "G4CompetitiveFission::operator= meant to not be accessable");
71 if (OPTxs == 1) { fFactor = 0.5; } << 66 return *this;
72 } << 67 }
73 } << 68
74 << 69 G4bool G4CompetitiveFission::operator==(const G4CompetitiveFission &right) const
75 G4double G4CompetitiveFission::GetEmissionProb << 70 {
76 { << 71 return (this == (G4CompetitiveFission *) &right);
77 if (!isInitialised) { Initialise(); } <<
78 G4int Z = fragment->GetZ_asInt(); <<
79 G4int A = fragment->GetA_asInt(); <<
80 fissionProbability = 0.0; <<
81 // Saddle point excitation energy ---> A = 6 <<
82 if (A >= 65 && Z > 16) { <<
83 G4double exEnergy = fragment->GetExcitatio <<
84 pairingCorrection->GetFissionPairingCorr <<
85 <<
86 if (exEnergy > 0.0) { <<
87 fissionBarrier = theFissionBarrierPtr->F <<
88 maxKineticEnergy = exEnergy - fissionBar <<
89 fissionProbability = <<
90 theFissionProbabilityPtr->EmissionProbabilit <<
91 maxKineticEnergy); <<
92 } <<
93 } <<
94 return fissionProbability*fFactor; <<
95 } 72 }
96 73
97 G4Fragment* G4CompetitiveFission::EmittedFragm << 74 G4bool G4CompetitiveFission::operator!=(const G4CompetitiveFission &right) const
98 { 75 {
99 G4Fragment * Fragment1 = nullptr; << 76 return (this != (G4CompetitiveFission *) &right);
100 // Nucleus data << 77 }
101 // Atomic number of nucleus << 78
102 G4int A = theNucleus->GetA_asInt(); <<
103 // Charge of nucleus <<
104 G4int Z = theNucleus->GetZ_asInt(); <<
105 // Excitation energy (in MeV) <<
106 G4double U = theNucleus->GetExcitationEnergy <<
107 G4double pcorr = pairingCorrection->GetFissi <<
108 if (U <= pcorr) { return Fragment1; } <<
109 79
110 // Atomic Mass of Nucleus (in MeV) <<
111 G4double M = theNucleus->GetGroundStateMass( <<
112 80
113 // Nucleus Momentum <<
114 G4LorentzVector theNucleusMomentum = theNucl <<
115 81
116 // Calculate fission parameters << 82 void G4CompetitiveFission::Initialize(const G4Fragment & fragment)
117 theParam.DefineParameters(A, Z, U-pcorr, fis << 83 {
>> 84 G4int anA = static_cast<G4int>(fragment.GetA());
>> 85 G4int aZ = static_cast<G4int>(fragment.GetZ());
>> 86 G4double ExEnergy = fragment.GetExcitationEnergy() -
>> 87 G4PairingCorrection::GetInstance()->GetFissionPairingCorrection(anA,aZ);
118 88
119 // First fragment << 89
120 G4int A1 = 0; << 90 // Saddle point excitation energy ---> A = 65
121 G4int Z1 = 0; << 91 // Fission is excluded for A < 65
122 G4double M1 = 0.0; << 92 if (anA >= 65 && ExEnergy > 0.0) {
123 << 93 FissionBarrier = theFissionBarrierPtr->FissionBarrier(anA,aZ,ExEnergy);
124 // Second fragment << 94 MaximalKineticEnergy = ExEnergy - FissionBarrier;
125 G4int A2 = 0; << 95 LevelDensityParameter = theLevelDensityPtr->LevelDensityParameter(anA,aZ,ExEnergy);
126 G4int Z2 = 0; << 96 FissionProbability = theFissionProbabilityPtr->EmissionProbability(fragment,MaximalKineticEnergy);
127 G4double M2 = 0.0; <<
128 <<
129 G4double FragmentsExcitationEnergy = 0.0; <<
130 G4double FragmentsKineticEnergy = 0.0; <<
131 <<
132 G4int Trials = 0; <<
133 do { <<
134 <<
135 // First fragment <<
136 A1 = FissionAtomicNumber(A); <<
137 Z1 = FissionCharge(A, Z, A1); <<
138 M1 = G4NucleiProperties::GetNuclearMass(A1 <<
139 <<
140 // Second Fragment <<
141 A2 = A - A1; <<
142 Z2 = Z - Z1; <<
143 if (A2 < 1 || Z2 < 0 || Z2 > A2) { <<
144 FragmentsExcitationEnergy = -1.0; <<
145 continue; <<
146 } 97 }
147 M2 = G4NucleiProperties::GetNuclearMass(A2 << 98 else {
148 // Maximal Kinetic Energy (available energ << 99 MaximalKineticEnergy = -1000.0*MeV;
149 G4double Tmax = M + U - M1 - M2 - pcorr; << 100 LevelDensityParameter = 0.0;
150 << 101 FissionProbability = 0.0;
151 // Check that fragment masses are less or <<
152 if (Tmax < 0.0) { <<
153 FragmentsExcitationEnergy = -1.0; <<
154 continue; <<
155 } 102 }
156 103
157 FragmentsKineticEnergy = FissionKineticEne << 104 return;
158 A1, Z1, << 105 }
159 A2, Z2, <<
160 U , Tmax); <<
161 <<
162 // Excitation Energy <<
163 // FragmentsExcitationEnergy = Tmax - Frag <<
164 // JMQ 04/03/09 BUG FIXED: in order to ful <<
165 // fragments carry the fission pairing ene <<
166 // excitation energy <<
167 106
168 FragmentsExcitationEnergy = <<
169 Tmax - FragmentsKineticEnergy + pcorr; <<
170 107
171 // Loop checking, 05-Aug-2015, Vladimir Iv <<
172 } while (FragmentsExcitationEnergy < 0.0 && <<
173 <<
174 if (FragmentsExcitationEnergy <= 0.0) { <<
175 throw G4HadronicException(__FILE__, __LINE <<
176 "G4CompetitiveFission::BreakItUp: Excita <<
177 } <<
178 108
179 // Fragment 1 << 109 G4FragmentVector * G4CompetitiveFission::BreakUp(const G4Fragment & theNucleus)
180 M1 += FragmentsExcitationEnergy * A1/static_ << 110 {
181 // Fragment 2 << 111 // Nucleus data
182 M2 += FragmentsExcitationEnergy * A2/static_ << 112 // Atomic number of nucleus
183 // primary << 113 G4int A = static_cast<G4int>(theNucleus.GetA());
184 M += U; << 114 // Charge of nucleus
185 << 115 G4int Z = static_cast<G4int>(theNucleus.GetZ());
186 G4double etot1 = ((M - M2)*(M + M2) + M1*M1) << 116 // Excitation energy (in MeV)
187 G4ParticleMomentum Momentum1 = << 117 G4double U = theNucleus.GetExcitationEnergy() -
188 std::sqrt((etot1 - M1)*(etot1+M1))*G4Rando << 118 G4PairingCorrection::GetInstance()->GetFissionPairingCorrection(A,Z);
189 G4LorentzVector FourMomentum1(Momentum1, eto << 119 // Check that U > 0
190 FourMomentum1.boost(theNucleusMomentum.boost << 120 if (U <= 0.0) {
>> 121 G4FragmentVector * theResult = new G4FragmentVector;
>> 122 theResult->push_back(new G4Fragment(theNucleus));
>> 123 return theResult;
>> 124 }
>> 125
>> 126 // Atomic Mass of Nucleus (in MeV)
>> 127 G4double M = G4ParticleTable::GetParticleTable()->GetIonTable()->GetIonMass(Z,A)/MeV;
>> 128 // Nucleus Momentum
>> 129 G4LorentzVector theNucleusMomentum = theNucleus.GetMomentum();
>> 130
>> 131 // Calculate fission parameters
>> 132 G4FissionParameters theParameters(A,Z,U,FissionBarrier);
>> 133
>> 134 // First fragment
>> 135 G4int A1 = 0;
>> 136 G4int Z1 = 0;
>> 137 G4double M1 = 0.0;
>> 138
>> 139 // Second fragment
>> 140 G4int A2 = 0;
>> 141 G4int Z2 = 0;
>> 142 G4double M2 = 0.0;
>> 143
>> 144 G4double FragmentsExcitationEnergy = 0.0;
>> 145 G4double FragmentsKineticEnergy = 0.0;
>> 146
>> 147 G4int Trials = 0;
>> 148 do {
>> 149
>> 150 // First fragment
>> 151 A1 = FissionAtomicNumber(A,theParameters);
>> 152 Z1 = FissionCharge(A,Z,A1);
>> 153 M1 = G4ParticleTable::GetParticleTable()->GetIonTable()->GetIonMass(Z1,A1);
>> 154
>> 155
>> 156 // Second Fragment
>> 157 A2 = A - A1;
>> 158 Z2 = Z - Z1;
>> 159 if (A2 < 1 || Z2 < 0)
>> 160 throw G4HadronicException(__FILE__, __LINE__, "G4CompetitiveFission::BreakUp: Can't define second fragment! ");
>> 161 M2 = G4ParticleTable::GetParticleTable()->GetIonTable()->GetIonMass(Z2,A2)/MeV;
>> 162
>> 163 // Check that fragment masses are less or equal than total energy
>> 164 // if (M1 + M2 > theNucleusMomentum.mag()/MeV)
>> 165 if (M1 + M2 > theNucleusMomentum.e()/MeV)
>> 166 throw G4HadronicException(__FILE__, __LINE__, "G4CompetitiveFission::BreakUp: Fragments Mass > Total Energy");
>> 167
>> 168 // Maximal Kinetic Energy (available energy for fragments)
>> 169 // G4double Tmax = theNucleusMomentum.mag()/MeV - M1 - M2;
>> 170 G4double Tmax = M + U - M1 - M2;
>> 171
>> 172 FragmentsKineticEnergy = FissionKineticEnergy( A , Z,
>> 173 A1, Z1,
>> 174 A2, Z2,
>> 175 U , Tmax,
>> 176 theParameters);
>> 177
>> 178 // Excitation Energy
>> 179 FragmentsExcitationEnergy = Tmax - FragmentsKineticEnergy;
191 180
192 // Create Fragments << 181 } while (FragmentsExcitationEnergy < 0.0 && Trials++ < 100);
193 Fragment1 = new G4Fragment( A1, Z1, FourMome <<
194 if (Fragment1 != nullptr) { Fragment1->SetCr <<
195 theNucleusMomentum -= FourMomentum1; <<
196 theNucleus->SetZandA_asInt(Z2, A2); <<
197 theNucleus->SetMomentum(theNucleusMomentum); <<
198 theNucleus->SetCreatorModelID(theSecID); <<
199 return Fragment1; <<
200 } <<
201 <<
202 G4int <<
203 G4CompetitiveFission::FissionAtomicNumber(G4in <<
204 // Calculates the atomic number of a fission <<
205 { <<
206 <<
207 // For Simplicity reading code <<
208 G4int A1 = theParam.GetA1(); <<
209 G4int A2 = theParam.GetA2(); <<
210 G4double As = theParam.GetAs(); <<
211 G4double Sigma2 = theParam.GetSigma2(); <<
212 G4double SigmaS = theParam.GetSigmaS(); <<
213 G4double w = theParam.GetW(); <<
214 182
215 G4double C2A = A2 + 3.72*Sigma2; <<
216 G4double C2S = As + 3.72*SigmaS; <<
217 183
218 G4double C2 = 0.0; <<
219 if (w > 1000.0 ) { C2 = C2S; } <<
220 else if (w < 0.001) { C2 = C2A; } <<
221 else { C2 = std::max(C2A,C2S <<
222 <<
223 G4double C1 = A-C2; <<
224 if (C1 < 30.0) { <<
225 C2 = A-30.0; <<
226 C1 = 30.0; <<
227 } <<
228 <<
229 G4double Am1 = (As + A1)*0.5; <<
230 G4double Am2 = (A1 + A2)*0.5; <<
231 <<
232 // Get Mass distributions as sum of symmetri <<
233 G4double Mass1 = MassDistribution(As,A); <<
234 G4double Mass2 = MassDistribution(Am1,A); <<
235 G4double Mass3 = MassDistribution(G4double(A <<
236 G4double Mass4 = MassDistribution(Am2,A); <<
237 G4double Mass5 = MassDistribution(G4double(A <<
238 // get maximal value among Mass1,...,Mass5 <<
239 G4double MassMax = Mass1; <<
240 if (Mass2 > MassMax) { MassMax = Mass2; } <<
241 if (Mass3 > MassMax) { MassMax = Mass3; } <<
242 if (Mass4 > MassMax) { MassMax = Mass4; } <<
243 if (Mass5 > MassMax) { MassMax = Mass5; } <<
244 <<
245 // Sample a fragment mass number, which lies <<
246 G4double xm; <<
247 G4double Pm; <<
248 do { <<
249 xm = C1+G4UniformRand()*(C2-C1); <<
250 Pm = MassDistribution(xm,A); <<
251 // Loop checking, 05-Aug-2015, Vladimir Iv <<
252 } while (MassMax*G4UniformRand() > Pm); <<
253 G4int ires = G4lrint(xm); <<
254 <<
255 return ires; <<
256 } <<
257 <<
258 G4double <<
259 G4CompetitiveFission::MassDistribution(G4doubl <<
260 // This method gives mass distribution F(x) <<
261 // which consist of symmetric and asymmetric <<
262 { <<
263 G4double y0 = (x-theParam.GetAs())/theParam. <<
264 G4double Xsym = LocalExp(y0); <<
265 <<
266 G4double y1 = (x - theParam.GetA1())/thePara <<
267 G4double y2 = (x - theParam.GetA2())/thePara <<
268 G4double z1 = (x - A + theParam.GetA1())/the <<
269 G4double z2 = (x - A + theParam.GetA2())/the <<
270 G4double Xasym = LocalExp(y1) + LocalExp(y2) <<
271 + 0.5*(LocalExp(z1) + LocalExp(z2)); <<
272 <<
273 G4double res; <<
274 G4double w = theParam.GetW(); <<
275 if (w > 1000) { res = Xsym; } <<
276 else if (w < 0.001) { res = Xasym; } <<
277 else { res = w*Xsym+Xasym; } <<
278 return res; <<
279 } <<
280 <<
281 G4int G4CompetitiveFission::FissionCharge(G4in <<
282 // Calculates the charge of a fission produc <<
283 { <<
284 static const G4double sigma = 0.6; <<
285 G4double DeltaZ = 0.0; <<
286 if (Af >= 134.0) { DeltaZ = -0.45; <<
287 else if (Af <= (A-134.0)) { DeltaZ = 0.45; } <<
288 else { DeltaZ = -0.45*( <<
289 184
290 G4double Zmean = (Af/A)*Z + DeltaZ; << 185 if (FragmentsExcitationEnergy <= 0.0)
291 << 186 throw G4HadronicException(__FILE__, __LINE__, "G4CompetitiveFission::BreakItUp: Excitation energy for fragments < 0.0!");
292 G4double theZ; << 187
293 do { << 188
294 theZ = G4RandGauss::shoot(Zmean,sigma); << 189 // while (FragmentsExcitationEnergy < 0 && Trials < 100);
295 // Loop checking, 05-Aug-2015, Vladimir Iv <<
296 } while (theZ < 1.0 || theZ > (Z-1.0) || th <<
297 190
298 return G4lrint(theZ); << 191 // Fragment 1
>> 192 G4double U1 = FragmentsExcitationEnergy * (static_cast<G4double>(A1)/static_cast<G4double>(A));
>> 193 // Fragment 2
>> 194 G4double U2 = FragmentsExcitationEnergy * (static_cast<G4double>(A2)/static_cast<G4double>(A));
>> 195
>> 196
>> 197 G4double Pmax = std::sqrt( 2 * ( ( (M1+U1)*(M2+U2) ) /
>> 198 ( (M1+U1)+(M2+U2) ) ) * FragmentsKineticEnergy);
>> 199
>> 200 G4ParticleMomentum momentum1 = IsotropicVector( Pmax );
>> 201 G4ParticleMomentum momentum2( -momentum1 );
>> 202
>> 203 // Perform a Galileo boost for fragments
>> 204 momentum1 += (theNucleusMomentum.boostVector() * (M1+U1));
>> 205 momentum2 += (theNucleusMomentum.boostVector() * (M2+U2));
>> 206
>> 207
>> 208 // Create 4-momentum for first fragment
>> 209 // Warning!! Energy conservation is broken
>> 210 G4LorentzVector FourMomentum1( momentum1 , std::sqrt(momentum1.mag2() + (M1+U1)*(M1+U1)));
>> 211
>> 212 // Create 4-momentum for second fragment
>> 213 // Warning!! Energy conservation is broken
>> 214 G4LorentzVector FourMomentum2( momentum2 , std::sqrt(momentum2.mag2() + (M2+U2)*(M2+U2)));
>> 215
>> 216 // Create Fragments
>> 217 G4Fragment * Fragment1 = new G4Fragment( A1, Z1, FourMomentum1);
>> 218 if (!Fragment1) throw G4HadronicException(__FILE__, __LINE__, "G4CompetitiveFission::BreakItUp: Can't create Fragment1! ");
>> 219 G4Fragment * Fragment2 = new G4Fragment( A2, Z2, FourMomentum2);
>> 220 if (!Fragment2) throw G4HadronicException(__FILE__, __LINE__, "G4CompetitiveFission::BreakItUp: Can't create Fragment2! ");
>> 221
>> 222 #ifdef PRECOMPOUND_TEST
>> 223 Fragment1->SetCreatorModel(G4String("G4CompetitiveFission"));
>> 224 Fragment2->SetCreatorModel(G4String("G4CompetitiveFission"));
>> 225 #endif
>> 226 // Create Fragment Vector
>> 227 G4FragmentVector * theResult = new G4FragmentVector;
>> 228
>> 229 theResult->push_back(Fragment1);
>> 230 theResult->push_back(Fragment2);
>> 231
>> 232 #ifdef debug
>> 233 CheckConservation(theNucleus,theResult);
>> 234 #endif
>> 235
>> 236 return theResult;
299 } 237 }
300 238
301 G4double << 239
302 G4CompetitiveFission::FissionKineticEnergy(G4i << 240
303 G4int Af1, G4int /*Zf1*/, << 241 G4int G4CompetitiveFission::FissionAtomicNumber(const G4int A, const G4FissionParameters & theParam)
304 G4int Af2, G4int /*Zf2*/, << 242 // Calculates the atomic number of a fission product
305 G4double /*U*/, G4double Tmax) << 243 {
306 // Gives the kinetic energy of fission produ << 244
307 { << 245 // For Simplicity reading code
308 // Find maximal value of A for fragments << 246 const G4double A1 = theParam.GetA1();
309 G4int AfMax = std::max(Af1,Af2); << 247 const G4double A2 = theParam.GetA2();
310 << 248 const G4double As = theParam.GetAs();
311 // Weights for symmetric and asymmetric comp << 249 // const G4double Sigma1 = theParam.GetSigma1();
312 G4double Pas = 0.0; << 250 const G4double Sigma2 = theParam.GetSigma2();
313 if (theParam.GetW() <= 1000) { << 251 const G4double SigmaS = theParam.GetSigmaS();
314 G4double x1 = (AfMax-theParam.GetA1())/the << 252 const G4double w = theParam.GetW();
315 G4double x2 = (AfMax-theParam.GetA2())/the << 253
316 Pas = 0.5*LocalExp(x1) + LocalExp(x2); << 254
317 } << 255 // G4double FasymAsym = 2.0*std::exp(-((A2-As)*(A2-As))/(2.0*Sigma2*Sigma2)) +
318 << 256 // std::exp(-((A1-As)*(A1-As))/(2.0*Sigma1*Sigma1));
319 G4double Ps = 0.0; << 257
320 if (theParam.GetW() >= 0.001) { << 258 // G4double FsymA1A2 = std::exp(-((As-(A1+A2))*(As-(A1+A2)))/(2.0*SigmaS*SigmaS));
321 G4double xs = (AfMax-theParam.GetAs())/the << 259
322 Ps = theParam.GetW()*LocalExp(xs); << 260
323 } << 261 G4double C2A = A2 + 3.72*Sigma2;
324 G4double Psy = (Pas + Ps > 0.0) ? Ps/(Pas+Ps << 262 G4double C2S = As + 3.72*SigmaS;
325 <<
326 // Fission fractions Xsy and Xas formed in s <<
327 G4double PPas = theParam.GetSigma1() + 2.0 * <<
328 G4double PPsy = theParam.GetW() * theParam.G <<
329 G4double Xas = (PPas + PPsy > 0.0) ? PPas/(P <<
330 G4double Xsy = 1.0 - Xas; <<
331 <<
332 // Average kinetic energy for symmetric and <<
333 G4double Eaverage = (0.1071*(Z*Z)/G4Pow::Get <<
334 <<
335 // Compute maximal average kinetic energy of <<
336 G4double TaverageAfMax; <<
337 G4double ESigma = 10*CLHEP::MeV; <<
338 // Select randomly fission mode (symmetric o <<
339 if (G4UniformRand() > Psy) { // Asymmetric M <<
340 G4double A11 = theParam.GetA1()-0.7979*the <<
341 G4double A12 = theParam.GetA1()+0.7979*the <<
342 G4double A21 = theParam.GetA2()-0.7979*the <<
343 G4double A22 = theParam.GetA2()+0.7979*the <<
344 // scale factor <<
345 G4double ScaleFactor = 0.5*theParam.GetSig <<
346 (AsymmetricRatio(A,A11)+AsymmetricRatio( <<
347 theParam.GetSigma2()*(AsymmetricRatio(A, <<
348 // Compute average kinetic energy for frag <<
349 TaverageAfMax = (Eaverage + 12.5 * Xsy) * <<
350 AsymmetricRatio(A,G4double(AfMax)); <<
351 <<
352 } else { // Symmetric Mode <<
353 G4double As0 = theParam.GetAs() + 0.7979*t <<
354 // Compute average kinetic energy for frag <<
355 TaverageAfMax = (Eaverage - 12.5*CLHEP::Me <<
356 *SymmetricRatio(A, G4double(AfMax))/Symm <<
357 ESigma = 8.0*CLHEP::MeV; <<
358 } <<
359 <<
360 // Select randomly, in accordance with Gauss <<
361 // fragment kinetic energy <<
362 G4double KineticEnergy; <<
363 G4int i = 0; <<
364 do { <<
365 KineticEnergy = G4RandGauss::shoot(Taverag <<
366 if (++i > 100) return Eaverage; <<
367 // Loop checking, 05-Aug-2015, Vladimir Iv <<
368 } while (KineticEnergy < Eaverage-3.72*ESigm <<
369 KineticEnergy > Eaverage+3.72*ESigma || <<
370 KineticEnergy > Tmax); <<
371 263
372 return KineticEnergy; << 264 G4double C2 = 0.0;
>> 265 if (w > 1000.0 ) C2 = C2S;
>> 266 else if (w < 0.001) C2 = C2A;
>> 267 else C2 = std::max(C2A,C2S);
>> 268
>> 269 G4double C1 = A-C2;
>> 270 if (C1 < 30.0) {
>> 271 C2 = A-30.0;
>> 272 C1 = 30.0;
>> 273 }
>> 274
>> 275 G4double Am1 = (As + A1)/2.0;
>> 276 G4double Am2 = (A1 + A2)/2.0;
>> 277
>> 278 // Get Mass distributions as sum of symmetric and asymmetric Gasussians
>> 279 G4double Mass1 = MassDistribution(As,A,theParam);
>> 280 G4double Mass2 = MassDistribution(Am1,A,theParam);
>> 281 G4double Mass3 = MassDistribution(A1,A,theParam);
>> 282 G4double Mass4 = MassDistribution(Am2,A,theParam);
>> 283 G4double Mass5 = MassDistribution(A2,A,theParam);
>> 284 // get maximal value among Mass1,...,Mass5
>> 285 G4double MassMax = Mass1;
>> 286 if (Mass2 > MassMax) MassMax = Mass2;
>> 287 if (Mass3 > MassMax) MassMax = Mass3;
>> 288 if (Mass4 > MassMax) MassMax = Mass4;
>> 289 if (Mass5 > MassMax) MassMax = Mass5;
>> 290
>> 291 // Sample a fragment mass number, which lies between C1 and C2
>> 292 G4double m;
>> 293 G4double Pm;
>> 294 do {
>> 295 m = C1+G4UniformRand()*(C2-C1);
>> 296 Pm = MassDistribution(m,A,theParam);
>> 297 } while (G4UniformRand() > Pm/MassMax);
>> 298
>> 299 return static_cast<G4int>(m+0.5);
373 } 300 }
374 301
375 void G4CompetitiveFission::SetFissionBarrier(G << 302
>> 303
>> 304
>> 305
>> 306
>> 307 G4double G4CompetitiveFission::MassDistribution(const G4double x, const G4double A,
>> 308 const G4FissionParameters & theParam)
>> 309 // This method gives mass distribution F(x) = F_{asym}(x)+w*F_{sym}(x)
>> 310 // which consist of symmetric and asymmetric sum of gaussians components.
376 { 311 {
377 if (myOwnFissionBarrier) delete theFissionBa << 312 G4double Xsym = std::exp(-0.5*(x-theParam.GetAs())*(x-theParam.GetAs())/
378 theFissionBarrierPtr = aBarrier; << 313 (theParam.GetSigmaS()*theParam.GetSigmaS()));
379 myOwnFissionBarrier = false; << 314
>> 315 G4double Xasym = std::exp(-0.5*(x-theParam.GetA2())*(x-theParam.GetA2())/
>> 316 (theParam.GetSigma2()*theParam.GetSigma2())) +
>> 317 std::exp(-0.5*(x-(A-theParam.GetA2()))*(x-(A-theParam.GetA2()))/
>> 318 (theParam.GetSigma2()*theParam.GetSigma2())) +
>> 319 0.5*std::exp(-0.5*(x-theParam.GetA1())*(x-theParam.GetA1())/
>> 320 (theParam.GetSigma1()*theParam.GetSigma1())) +
>> 321 0.5*std::exp(-0.5*(x-(A-theParam.GetA1()))*(x-(A-theParam.GetA1()))/
>> 322 (theParam.GetSigma1()*theParam.GetSigma1()));
>> 323
>> 324 if (theParam.GetW() > 1000) return Xsym;
>> 325 else if (theParam.GetW() < 0.001) return Xasym;
>> 326 else return theParam.GetW()*Xsym+Xasym;
380 } 327 }
381 328
382 void << 329
383 G4CompetitiveFission::SetEmissionStrategy(G4VE << 330
>> 331
>> 332 G4int G4CompetitiveFission::FissionCharge(const G4double A,
>> 333 const G4double Z,
>> 334 const G4double Af)
>> 335 // Calculates the charge of a fission product for a given atomic number Af
384 { 336 {
385 if (myOwnFissionProbability) delete theFissi << 337 const G4double sigma = 0.6;
386 theFissionProbabilityPtr = aFissionProb; << 338 G4double DeltaZ = 0.0;
387 myOwnFissionProbability = false; << 339 if (Af >= 134.0) DeltaZ = -0.45; // 134 <= Af
>> 340 else if (A <= (A-134.0)) DeltaZ = 0.45; // Af <= (A-134)
>> 341 else DeltaZ = -0.45*(Af-(A/2.0))/(134.0-(A/2.0)); // (A-134) < Af < 134
>> 342
>> 343 G4double Zmean = (Af/A)*Z + DeltaZ;
>> 344
>> 345 G4double theZ;
>> 346 do {
>> 347 theZ = G4RandGauss::shoot(Zmean,sigma);
>> 348 } while (theZ < 1.0 || theZ > (Z-1.0) || theZ > Af);
>> 349 // return static_cast<G4int>(theZ+0.5);
>> 350 return static_cast<G4int>(theZ+0.5);
388 } 351 }
389 352
390 void << 353
391 G4CompetitiveFission::SetLevelDensityParameter << 354
392 { << 355
393 if (myOwnLevelDensity) delete theLevelDensit << 356 G4double G4CompetitiveFission::FissionKineticEnergy(const G4double A, const G4double Z,
394 theLevelDensityPtr = aLevelDensity; << 357 const G4double Af1, const G4double /*Zf1*/,
395 myOwnLevelDensity = false; << 358 const G4double Af2, const G4double /*Zf2*/,
>> 359 const G4double /*U*/, const G4double Tmax,
>> 360 const G4FissionParameters & theParam)
>> 361 // Gives the kinetic energy of fission products
>> 362 {
>> 363 // Find maximal value of A for fragments
>> 364 G4double AfMax = std::max(Af1,Af2);
>> 365 if (AfMax < (A/2.0)) AfMax = A - AfMax;
>> 366
>> 367 // Weights for symmetric and asymmetric components
>> 368 G4double Pas;
>> 369 if (theParam.GetW() > 1000) Pas = 0.0;
>> 370 else {
>> 371 G4double P1 = 0.5*std::exp(-0.5*(AfMax-theParam.GetA1())*(AfMax-theParam.GetA1())/
>> 372 (theParam.GetSigma1()*theParam.GetSigma1()));
>> 373
>> 374 G4double P2 = std::exp(-0.5*(AfMax-theParam.GetA2())*(AfMax-theParam.GetA2())/
>> 375 (theParam.GetSigma2()*theParam.GetSigma2()));
>> 376
>> 377 Pas = P1+P2;
>> 378 }
>> 379
>> 380
>> 381 G4double Ps;
>> 382 if (theParam.GetW() < 0.001) Ps = 0.0;
>> 383 else
>> 384 Ps = theParam.GetW()*std::exp(-0.5*(AfMax-theParam.GetAs())*(AfMax-theParam.GetAs())/
>> 385 (theParam.GetSigmaS()*theParam.GetSigmaS()));
>> 386
>> 387
>> 388
>> 389 G4double Psy = Ps/(Pas+Ps);
>> 390
>> 391
>> 392 // Fission fractions Xsy and Xas formed in symmetric and asymmetric modes
>> 393 G4double PPas = theParam.GetSigma1() + 2.0 * theParam.GetSigma2();
>> 394 G4double PPsy = theParam.GetW() * theParam.GetSigmaS();
>> 395 G4double Xas = PPas / (PPas+PPsy);
>> 396 G4double Xsy = PPsy / (PPas+PPsy);
>> 397
>> 398
>> 399 // Average kinetic energy for symmetric and asymmetric components
>> 400 G4double Eaverage = 0.1071*MeV*(Z*Z)/std::pow(A,1.0/3.0) + 22.2*MeV;
>> 401
>> 402
>> 403 // Compute maximal average kinetic energy of fragments and Energy Dispersion (sqrt)
>> 404 G4double TaverageAfMax;
>> 405 G4double ESigma;
>> 406 // Select randomly fission mode (symmetric or asymmetric)
>> 407 if (G4UniformRand() > Psy) { // Asymmetric Mode
>> 408 G4double A11 = theParam.GetA1()-0.7979*theParam.GetSigma1();
>> 409 G4double A12 = theParam.GetA1()+0.7979*theParam.GetSigma1();
>> 410 G4double A21 = theParam.GetA2()-0.7979*theParam.GetSigma2();
>> 411 G4double A22 = theParam.GetA2()+0.7979*theParam.GetSigma2();
>> 412 // scale factor
>> 413 G4double ScaleFactor = 0.5*theParam.GetSigma1()*(AsymmetricRatio(A,A11)+AsymmetricRatio(A,A12))+
>> 414 theParam.GetSigma2()*(AsymmetricRatio(A,A21)+AsymmetricRatio(A,A22));
>> 415 // Compute average kinetic energy for fragment with AfMax
>> 416 TaverageAfMax = (Eaverage + 12.5 * Xsy) * (PPas/ScaleFactor) * AsymmetricRatio(A,AfMax);
>> 417 ESigma = 10.0*MeV; // MeV
>> 418
>> 419 } else { // Symmetric Mode
>> 420 G4double As0 = theParam.GetAs() + 0.7979*theParam.GetSigmaS();
>> 421 // scale factor
>> 422 G4double ScaleFactor = theParam.GetW()*theParam.GetSigmaS()*SymmetricRatio(A,As0);
>> 423 // Compute average kinetic energy for fragment with AfMax
>> 424 TaverageAfMax = (Eaverage - 12.5*MeV*Xas) * (PPsy/ScaleFactor) * SymmetricRatio(A,AfMax);
>> 425 ESigma = 8.0*MeV;
>> 426 }
>> 427
>> 428
>> 429 // Select randomly, in accordance with Gaussian distribution, fragment kinetic energy
>> 430 G4double KineticEnergy;
>> 431 G4int i = 0;
>> 432 do {
>> 433 KineticEnergy = G4RandGauss::shoot(TaverageAfMax,ESigma);
>> 434 if (i++ > 100) return Eaverage;
>> 435 } while (KineticEnergy < Eaverage-3.72*ESigma ||
>> 436 KineticEnergy > Eaverage+3.72*ESigma ||
>> 437 KineticEnergy > Tmax);
>> 438
>> 439 return KineticEnergy;
396 } 440 }
>> 441
>> 442
>> 443
>> 444
>> 445
>> 446 G4double G4CompetitiveFission::AsymmetricRatio(const G4double A,const G4double A11)
>> 447 {
>> 448 const G4double B1 = 23.5;
>> 449 const G4double A00 = 134.0;
>> 450 return Ratio(A,A11,B1,A00);
>> 451 }
>> 452
>> 453 G4double G4CompetitiveFission::SymmetricRatio(const G4double A,const G4double A11)
>> 454 {
>> 455 const G4double B1 = 5.32;
>> 456 const G4double A00 = A/2.0;
>> 457 return Ratio(A,A11,B1,A00);
>> 458 }
>> 459
>> 460 G4double G4CompetitiveFission::Ratio(const G4double A,const G4double A11,
>> 461 const G4double B1,const G4double A00)
>> 462 {
>> 463 if (A == 0) throw G4HadronicException(__FILE__, __LINE__, "G4CompetitiveFission::Ratio: A == 0!");
>> 464 if (A11 >= A/2.0 && A11 <= (A00+10.0)) return 1.0-B1*((A11-A00)/A)*((A11-A00)/A);
>> 465 else return 1.0-B1*(10.0/A)*(10.0/A)-2.0*(10.0/A)*B1*((A11-A00-10.0)/A);
>> 466 }
>> 467
>> 468
>> 469
>> 470
>> 471
>> 472 G4ThreeVector G4CompetitiveFission::IsotropicVector(const G4double Magnitude)
>> 473 // Samples a isotropic random vectorwith a magnitud given by Magnitude.
>> 474 // By default Magnitude = 1.0
>> 475 {
>> 476 G4double CosTheta = 1.0 - 2.0*G4UniformRand();
>> 477 G4double SinTheta = std::sqrt(1.0 - CosTheta*CosTheta);
>> 478 G4double Phi = twopi*G4UniformRand();
>> 479 G4ThreeVector Vector(Magnitude*std::cos(Phi)*SinTheta,
>> 480 Magnitude*std::sin(Phi)*SinTheta,
>> 481 Magnitude*CosTheta);
>> 482 return Vector;
>> 483 }
>> 484
>> 485
>> 486 #ifdef debug
>> 487 void G4CompetitiveFission::CheckConservation(const G4Fragment & theInitialState,
>> 488 G4FragmentVector * Result) const
>> 489 {
>> 490 G4double ProductsEnergy =0;
>> 491 G4ThreeVector ProductsMomentum;
>> 492 G4int ProductsA = 0;
>> 493 G4int ProductsZ = 0;
>> 494 G4FragmentVector::iterator h;
>> 495 for (h = Result->begin(); h != Result->end(); h++) {
>> 496 G4LorentzVector tmp = (*h)->GetMomentum();
>> 497 ProductsEnergy += tmp.e();
>> 498 ProductsMomentum += tmp.vect();
>> 499 ProductsA += static_cast<G4int>((*h)->GetA());
>> 500 ProductsZ += static_cast<G4int>((*h)->GetZ());
>> 501 }
>> 502
>> 503 if (ProductsA != theInitialState.GetA()) {
>> 504 G4cout << "!!!!!!!!!! Baryonic Number Conservation Violation !!!!!!!!!!" << G4endl;
>> 505 G4cout << "G4CompetitiveFission.cc: Barionic Number Conservation test for fission fragments"
>> 506 << G4endl;
>> 507 G4cout << "Initial A = " << theInitialState.GetA()
>> 508 << " Fragments A = " << ProductsA << " Diference --> "
>> 509 << theInitialState.GetA() - ProductsA << G4endl;
>> 510 }
>> 511 if (ProductsZ != theInitialState.GetZ()) {
>> 512 G4cout << "!!!!!!!!!! Charge Conservation Violation !!!!!!!!!!" << G4endl;
>> 513 G4cout << "G4CompetitiveFission.cc: Charge Conservation test for fission fragments"
>> 514 << G4endl;
>> 515 G4cout << "Initial Z = " << theInitialState.GetZ()
>> 516 << " Fragments Z = " << ProductsZ << " Diference --> "
>> 517 << theInitialState.GetZ() - ProductsZ << G4endl;
>> 518 }
>> 519 if (std::abs(ProductsEnergy-theInitialState.GetMomentum().e()) > 1.0*keV) {
>> 520 G4cout << "!!!!!!!!!! Energy Conservation Violation !!!!!!!!!!" << G4endl;
>> 521 G4cout << "G4CompetitiveFission.cc: Energy Conservation test for fission fragments"
>> 522 << G4endl;
>> 523 G4cout << "Initial E = " << theInitialState.GetMomentum().e()/MeV << " MeV"
>> 524 << " Fragments E = " << ProductsEnergy/MeV << " MeV Diference --> "
>> 525 << (theInitialState.GetMomentum().e() - ProductsEnergy)/MeV << " MeV" << G4endl;
>> 526 }
>> 527 if (std::abs(ProductsMomentum.x()-theInitialState.GetMomentum().x()) > 1.0*keV ||
>> 528 std::abs(ProductsMomentum.y()-theInitialState.GetMomentum().y()) > 1.0*keV ||
>> 529 std::abs(ProductsMomentum.z()-theInitialState.GetMomentum().z()) > 1.0*keV) {
>> 530 G4cout << "!!!!!!!!!! Momentum Conservation Violation !!!!!!!!!!" << G4endl;
>> 531 G4cout << "G4CompetitiveFission.cc: Momentum Conservation test for fission fragments"
>> 532 << G4endl;
>> 533 G4cout << "Initial P = " << theInitialState.GetMomentum().vect() << " MeV"
>> 534 << " Fragments P = " << ProductsMomentum << " MeV Diference --> "
>> 535 << theInitialState.GetMomentum().vect() - ProductsMomentum << " MeV" << G4endl;
>> 536 }
>> 537 return;
>> 538 }
>> 539 #endif
>> 540
>> 541
>> 542
397 543
398 544