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25 //
26 // INCL++ intra-nuclear cascade model
27 // Alain Boudard, CEA-Saclay, France
28 // Joseph Cugnon, University of Liege, Belgium
29 // Jean-Christophe David, CEA-Saclay, France
30 // Pekka Kaitaniemi, CEA-Saclay, France, and Helsinki Institute of Physics, Finland
31 // Sylvie Leray, CEA-Saclay, France
32 // Davide Mancusi, CEA-Saclay, France
33 //
34 #define INCLXX_IN_GEANT4_MODE 1
35
36 #include "globals.hh"
37
38 /** \file G4INCLNuclearPotentialIsospin.cc
39 * \brief Isospin-dependent nuclear potential.
40 *
41 * Provides an isospin-dependent nuclear potential.
42 *
43 * \date 28 February 2011
44 * \author Davide Mancusi
45 */
46
47 #include "G4INCLNuclearPotentialIsospin.hh"
48 #include "G4INCLNuclearPotentialConstant.hh"
49 #include "G4INCLParticleTable.hh"
50 #include "G4INCLGlobals.hh"
51
52 namespace G4INCL {
53
54 namespace NuclearPotential {
55
56 // Constructors
57 NuclearPotentialIsospin::NuclearPotentialIsospin(const G4int A, const G4int Z, const G4bool aPionPotential)
58 : INuclearPotential(A, Z, aPionPotential)
59 {
60 initialize();
61 }
62
63 // Destructor
64 NuclearPotentialIsospin::~NuclearPotentialIsospin() {}
65
66 void NuclearPotentialIsospin::initialize() {
67 const G4double ZOverA = ((G4double) theZ) / ((G4double) theA);
68
69 const G4double mp = ParticleTable::getINCLMass(Proton);
70 const G4double mn = ParticleTable::getINCLMass(Neutron);
71 const G4double ml = ParticleTable::getINCLMass(Lambda);
72
73 const G4double theFermiMomentum = ParticleTable::getFermiMomentum(theA,theZ);
74
75 fermiMomentum[Proton] = theFermiMomentum * Math::pow13(2.*ZOverA);
76 const G4double theProtonFermiEnergy = std::sqrt(fermiMomentum[Proton]*fermiMomentum[Proton] + mp*mp) - mp;
77 fermiEnergy[Proton] = theProtonFermiEnergy;
78 // Use separation energies from the ParticleTable
79 const G4double theProtonSeparationEnergy = ParticleTable::getSeparationEnergy(Proton,theA,theZ);
80 separationEnergy[Proton] = theProtonSeparationEnergy;
81 vProton = theProtonFermiEnergy + theProtonSeparationEnergy;
82
83 fermiMomentum[Neutron] = theFermiMomentum * Math::pow13(2.*(1.-ZOverA));
84 const G4double theNeutronFermiEnergy = std::sqrt(fermiMomentum[Neutron]*fermiMomentum[Neutron] + mn*mn) - mn;
85 fermiEnergy[Neutron] = theNeutronFermiEnergy;
86 // Use separation energies from the ParticleTable
87 const G4double theNeutronSeparationEnergy = ParticleTable::getSeparationEnergy(Neutron,theA,theZ);
88 separationEnergy[Neutron] = theNeutronSeparationEnergy;
89 vNeutron = theNeutronFermiEnergy + theNeutronSeparationEnergy;
90
91 const G4double separationEnergyDeltaPlusPlus = 2.*theProtonSeparationEnergy - theNeutronSeparationEnergy;
92 separationEnergy[DeltaPlusPlus] = separationEnergyDeltaPlusPlus;
93 separationEnergy[DeltaPlus] = theProtonSeparationEnergy;
94 separationEnergy[DeltaZero] = theNeutronSeparationEnergy;
95 const G4double separationEnergyDeltaMinus = 2.*theNeutronSeparationEnergy - theProtonSeparationEnergy;
96 separationEnergy[DeltaMinus] = separationEnergyDeltaMinus;
97
98 const G4double tinyMargin = 1E-7;
99 vDeltaPlus = vProton;
100 vDeltaZero = vNeutron;
101 vDeltaPlusPlus = std::max(separationEnergyDeltaPlusPlus + tinyMargin, 2.*vDeltaPlus - vDeltaZero);
102 vDeltaMinus = std::max(separationEnergyDeltaMinus + tinyMargin, 2.*vDeltaZero - vDeltaPlus);
103
104 vSigmaMinus = -16.; // Repulsive potential, from Eur. Phys.J.A. (2016) 52:21
105 vSigmaZero = -16.; // hypothesis: same potential for each sigma
106 vSigmaPlus = -16.;
107
108 vLambda = 30.;
109 vantiProton = 100.;
110
111 const G4double asy = (theA - 2.*theZ)/theA;
112 // Jose Luis Rodriguez-Sanchez et al., Rapid Communication PRC 98, 021602 (2018)
113 if (asy > 0.236) vLambda = 40.91;
114 else if (asy > 0.133) vLambda = 56.549 - 678.73*asy + 4905.35*asy*asy - 9789.1*asy*asy*asy;
115
116 const G4double theLambdaSeparationEnergy = ParticleTable::getSeparationEnergy(Lambda,theA,theZ);
117 const G4double theantiProtonSeparationEnergy = ParticleTable::getSeparationEnergy(antiProton,theA,theZ);
118
119 separationEnergy[PiPlus] = theProtonSeparationEnergy - theNeutronSeparationEnergy;
120 separationEnergy[PiZero] = 0.;
121 separationEnergy[PiMinus] = theNeutronSeparationEnergy - theProtonSeparationEnergy;
122
123 separationEnergy[Eta] = 0.;
124 separationEnergy[Omega] = 0.;
125 separationEnergy[EtaPrime] = 0.;
126 separationEnergy[Photon] = 0.;
127
128 separationEnergy[Lambda] = theLambdaSeparationEnergy;
129 separationEnergy[SigmaPlus] = theProtonSeparationEnergy + theLambdaSeparationEnergy - theNeutronSeparationEnergy;
130 separationEnergy[SigmaZero] = theLambdaSeparationEnergy;
131 separationEnergy[SigmaMinus] = theNeutronSeparationEnergy + theLambdaSeparationEnergy - theProtonSeparationEnergy;
132
133 separationEnergy[KPlus] = theProtonSeparationEnergy - theLambdaSeparationEnergy;
134 separationEnergy[KZero] = (theNeutronSeparationEnergy - theLambdaSeparationEnergy);
135 separationEnergy[KZeroBar] = (theLambdaSeparationEnergy - theNeutronSeparationEnergy);
136 separationEnergy[KMinus] = 2.*theNeutronSeparationEnergy - theProtonSeparationEnergy-theLambdaSeparationEnergy;
137
138 separationEnergy[KShort] = (theNeutronSeparationEnergy - theLambdaSeparationEnergy);
139 separationEnergy[KLong] = (theNeutronSeparationEnergy - theLambdaSeparationEnergy);
140
141 separationEnergy[antiProton] = theantiProtonSeparationEnergy;
142
143 fermiEnergy[DeltaPlusPlus] = vDeltaPlusPlus - separationEnergy[DeltaPlusPlus];
144 fermiEnergy[DeltaPlus] = vDeltaPlus - separationEnergy[DeltaPlus];
145 fermiEnergy[DeltaZero] = vDeltaZero - separationEnergy[DeltaZero];
146 fermiEnergy[DeltaMinus] = vDeltaMinus - separationEnergy[DeltaMinus];
147
148 fermiEnergy[Lambda] = vLambda - separationEnergy[Lambda];
149 if (fermiEnergy[Lambda] <= 0.)
150 fermiMomentum[Lambda]=0.;
151 else
152 fermiMomentum[Lambda]=std::sqrt(std::pow(fermiEnergy[Lambda]+ml,2.0)-ml*ml);
153
154 fermiEnergy[SigmaPlus] = vSigmaPlus - separationEnergy[SigmaPlus];
155 fermiEnergy[SigmaZero] = vSigmaZero - separationEnergy[SigmaZero];
156 fermiEnergy[SigmaMinus] = vSigmaMinus - separationEnergy[SigmaMinus];
157
158 fermiEnergy[antiProton] = vantiProton - separationEnergy[antiProton];
159
160 INCL_DEBUG("Table of separation energies [MeV] for A=" << theA << ", Z=" << theZ << ":" << '\n'
161 << " proton: " << separationEnergy[Proton] << '\n'
162 << " neutron: " << separationEnergy[Neutron] << '\n'
163 << " delta++: " << separationEnergy[DeltaPlusPlus] << '\n'
164 << " delta+: " << separationEnergy[DeltaPlus] << '\n'
165 << " delta0: " << separationEnergy[DeltaZero] << '\n'
166 << " delta-: " << separationEnergy[DeltaMinus] << '\n'
167 << " pi+: " << separationEnergy[PiPlus] << '\n'
168 << " pi0: " << separationEnergy[PiZero] << '\n'
169 << " pi-: " << separationEnergy[PiMinus] << '\n'
170 << " eta: " << separationEnergy[Eta] << '\n'
171 << " omega: " << separationEnergy[Omega] << '\n'
172 << " etaprime:" << separationEnergy[EtaPrime] << '\n'
173 << " photon: " << separationEnergy[Photon] << '\n'
174 << " lambda: " << separationEnergy[Lambda] << '\n'
175 << " sigmaplus: " << separationEnergy[SigmaPlus] << '\n'
176 << " sigmazero: " << separationEnergy[SigmaZero] << '\n'
177 << " sigmaminus: " << separationEnergy[SigmaMinus] << '\n'
178 << " kplus: " << separationEnergy[KPlus] << '\n'
179 << " kzero: " << separationEnergy[KZero] << '\n'
180 << " kzerobar: " << separationEnergy[KZeroBar] << '\n'
181 << " kminus: " << separationEnergy[KMinus] << '\n'
182 << " kshort: " << separationEnergy[KShort] << '\n'
183 << " klong: " << separationEnergy[KLong] << '\n'
184 );
185
186 INCL_DEBUG("Table of Fermi energies [MeV] for A=" << theA << ", Z=" << theZ << ":" << '\n'
187 << " proton: " << fermiEnergy[Proton] << '\n'
188 << " neutron: " << fermiEnergy[Neutron] << '\n'
189 << " delta++: " << fermiEnergy[DeltaPlusPlus] << '\n'
190 << " delta+: " << fermiEnergy[DeltaPlus] << '\n'
191 << " delta0: " << fermiEnergy[DeltaZero] << '\n'
192 << " delta-: " << fermiEnergy[DeltaMinus] << '\n'
193 << " lambda: " << fermiEnergy[Lambda] << '\n'
194 << " sigma+: " << fermiEnergy[SigmaPlus] << '\n'
195 << " sigma0: " << fermiEnergy[SigmaZero] << '\n'
196 << " sigma-: " << fermiEnergy[SigmaMinus] << '\n'
197 );
198
199 INCL_DEBUG("Table of Fermi momenta [MeV/c] for A=" << theA << ", Z=" << theZ << ":" << '\n'
200 << " proton: " << fermiMomentum[Proton] << '\n'
201 << " neutron: " << fermiMomentum[Neutron] << '\n'
202 );
203 }
204
205 G4double NuclearPotentialIsospin::computePotentialEnergy(const Particle *particle) const {
206
207 switch( particle->getType() )
208 {
209 case Proton:
210 return vProton;
211 break;
212 case Neutron:
213 return vNeutron;
214 break;
215
216 case PiPlus:
217 case PiZero:
218 case PiMinus:
219 return computePionPotentialEnergy(particle);
220 break;
221
222 case SigmaPlus:
223 return vSigmaPlus;
224 break;
225 case SigmaZero:
226 return vSigmaZero;
227 break;
228 case Lambda:
229 return vLambda;
230 break;
231 case SigmaMinus:
232 return vSigmaMinus;
233 break;
234
235 case Eta:
236 case Omega:
237 case EtaPrime:
238 return computePionResonancePotentialEnergy(particle);
239 break;
240
241 case KPlus:
242 case KZero:
243 case KZeroBar:
244 case KMinus:
245 case KShort:
246 case KLong:
247 return computeKaonPotentialEnergy(particle);
248 break;
249
250 case Photon:
251 return 0.0;
252 break;
253
254 case antiProton:
255 return vantiProton;
256 break;
257 case antiNeutron:
258 return vantiProton;
259 break;
260 case antiLambda:
261 return 0.0;
262 break;
263 case antiSigmaMinus:
264 return 0.0;
265 break;
266 case antiSigmaPlus:
267 return 0.0;
268 break;
269 case antiSigmaZero:
270 return 0.0;
271 break;
272 case antiXiMinus:
273 return 0.0;
274 break;
275 case antiXiZero:
276 return 0.0;
277 break;
278 case XiMinus:
279 return 0.0;
280 break;
281 case XiZero:
282 return 0.0;
283 break;
284
285 case DeltaPlusPlus:
286 return vDeltaPlusPlus;
287 break;
288 case DeltaPlus:
289 return vDeltaPlus;
290 break;
291 case DeltaZero:
292 return vDeltaZero;
293 break;
294 case DeltaMinus:
295 return vDeltaMinus;
296 break;
297 case Composite:
298 INCL_ERROR("No potential computed for particle of type Cluster.");
299 return 0.0;
300 break;
301 case UnknownParticle:
302 INCL_ERROR("Trying to compute potential energy for an unknown particle.");
303 return 0.0;
304 break;
305 }
306
307 INCL_ERROR("There is no potential for this type of particle.");
308 return 0.0;
309 }
310
311 }
312 }
313
314