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G4INCLNuclearPotentialIsospin.cc
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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 
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 = 28.;
109  const G4double asy = (theA - 2.*theZ)/theA;
110  if(asy>0.11)vLambda = 56.549-678.73*asy+4905.35*std::pow(asy,2.)-9789.1*std::pow(asy,3.); // Jose Luis Rodriguez-Sanchez et al., Rapid Communication PRC
111 
112  const G4double theLambdaSeparationEnergy = ParticleTable::getSeparationEnergy(Lambda,theA,theZ);
113 
114  separationEnergy[PiPlus] = theProtonSeparationEnergy - theNeutronSeparationEnergy;
115  separationEnergy[PiZero] = 0.;
116  separationEnergy[PiMinus] = theNeutronSeparationEnergy - theProtonSeparationEnergy;
117 
118  separationEnergy[Eta] = 0.;
119  separationEnergy[Omega] = 0.;
120  separationEnergy[EtaPrime] = 0.;
121  separationEnergy[Photon] = 0.;
122 
123  separationEnergy[Lambda] = theLambdaSeparationEnergy;
124  separationEnergy[SigmaPlus] = theProtonSeparationEnergy + theLambdaSeparationEnergy - theNeutronSeparationEnergy;
125  separationEnergy[SigmaZero] = theLambdaSeparationEnergy;
126  separationEnergy[SigmaMinus] = theNeutronSeparationEnergy + theLambdaSeparationEnergy - theProtonSeparationEnergy;
127 
128  separationEnergy[KPlus] = theProtonSeparationEnergy - theLambdaSeparationEnergy;
129  separationEnergy[KZero] = (theNeutronSeparationEnergy - theLambdaSeparationEnergy);
130  separationEnergy[KZeroBar] = (theLambdaSeparationEnergy - theNeutronSeparationEnergy);
131  separationEnergy[KMinus] = 2.*theNeutronSeparationEnergy - theProtonSeparationEnergy-theLambdaSeparationEnergy;
132 
133  separationEnergy[KShort] = (theNeutronSeparationEnergy - theLambdaSeparationEnergy);
134  separationEnergy[KLong] = (theNeutronSeparationEnergy - theLambdaSeparationEnergy);
135 
136  fermiEnergy[DeltaPlusPlus] = vDeltaPlusPlus - separationEnergy[DeltaPlusPlus];
137  fermiEnergy[DeltaPlus] = vDeltaPlus - separationEnergy[DeltaPlus];
138  fermiEnergy[DeltaZero] = vDeltaZero - separationEnergy[DeltaZero];
139  fermiEnergy[DeltaMinus] = vDeltaMinus - separationEnergy[DeltaMinus];
140 
141  fermiEnergy[Lambda] = vLambda - separationEnergy[Lambda];
142  if (fermiEnergy[Lambda] <= 0.)
143  fermiMomentum[Lambda]=0.;
144  else
145  fermiMomentum[Lambda]=std::sqrt(std::pow(fermiEnergy[Lambda]+ml,2.0)-ml*ml);
146 
147  fermiEnergy[SigmaPlus] = vSigmaPlus - separationEnergy[SigmaPlus];
148  fermiEnergy[SigmaZero] = vSigmaZero - separationEnergy[SigmaZero];
149  fermiEnergy[SigmaMinus] = vSigmaMinus - separationEnergy[SigmaMinus];
150 
151  INCL_DEBUG("Table of separation energies [MeV] for A=" << theA << ", Z=" << theZ << ":" << '\n'
152  << " proton: " << separationEnergy[Proton] << '\n'
153  << " neutron: " << separationEnergy[Neutron] << '\n'
154  << " delta++: " << separationEnergy[DeltaPlusPlus] << '\n'
155  << " delta+: " << separationEnergy[DeltaPlus] << '\n'
156  << " delta0: " << separationEnergy[DeltaZero] << '\n'
157  << " delta-: " << separationEnergy[DeltaMinus] << '\n'
158  << " pi+: " << separationEnergy[PiPlus] << '\n'
159  << " pi0: " << separationEnergy[PiZero] << '\n'
160  << " pi-: " << separationEnergy[PiMinus] << '\n'
161  << " eta: " << separationEnergy[Eta] << '\n'
162  << " omega: " << separationEnergy[Omega] << '\n'
163  << " etaprime:" << separationEnergy[EtaPrime] << '\n'
164  << " photon: " << separationEnergy[Photon] << '\n'
165  << " lambda: " << separationEnergy[Lambda] << '\n'
166  << " sigmaplus: " << separationEnergy[SigmaPlus] << '\n'
167  << " sigmazero: " << separationEnergy[SigmaZero] << '\n'
168  << " sigmaminus: " << separationEnergy[SigmaMinus] << '\n'
169  << " kplus: " << separationEnergy[KPlus] << '\n'
170  << " kzero: " << separationEnergy[KZero] << '\n'
171  << " kzerobar: " << separationEnergy[KZeroBar] << '\n'
172  << " kminus: " << separationEnergy[KMinus] << '\n'
173  << " kshort: " << separationEnergy[KShort] << '\n'
174  << " klong: " << separationEnergy[KLong] << '\n'
175  );
176 
177  INCL_DEBUG("Table of Fermi energies [MeV] for A=" << theA << ", Z=" << theZ << ":" << '\n'
178  << " proton: " << fermiEnergy[Proton] << '\n'
179  << " neutron: " << fermiEnergy[Neutron] << '\n'
180  << " delta++: " << fermiEnergy[DeltaPlusPlus] << '\n'
181  << " delta+: " << fermiEnergy[DeltaPlus] << '\n'
182  << " delta0: " << fermiEnergy[DeltaZero] << '\n'
183  << " delta-: " << fermiEnergy[DeltaMinus] << '\n'
184  << " lambda: " << fermiEnergy[Lambda] << '\n'
185  << " sigma+: " << fermiEnergy[SigmaPlus] << '\n'
186  << " sigma0: " << fermiEnergy[SigmaZero] << '\n'
187  << " sigma-: " << fermiEnergy[SigmaMinus] << '\n'
188  );
189 
190  INCL_DEBUG("Table of Fermi momenta [MeV/c] for A=" << theA << ", Z=" << theZ << ":" << '\n'
191  << " proton: " << fermiMomentum[Proton] << '\n'
192  << " neutron: " << fermiMomentum[Neutron] << '\n'
193  );
194  }
195 
196  G4double NuclearPotentialIsospin::computePotentialEnergy(const Particle *particle) const {
197 
198  switch( particle->getType() )
199  {
200  case Proton:
201  return vProton;
202  break;
203  case Neutron:
204  return vNeutron;
205  break;
206 
207  case PiPlus:
208  case PiZero:
209  case PiMinus:
210  return computePionPotentialEnergy(particle);
211  break;
212 
213  case SigmaPlus:
214  return vSigmaPlus;
215  break;
216  case SigmaZero:
217  return vSigmaZero;
218  break;
219  case Lambda:
220  return vLambda;
221  break;
222  case SigmaMinus:
223  return vSigmaMinus;
224  break;
225 
226  case Eta:
227  case Omega:
228  case EtaPrime:
229  return computePionResonancePotentialEnergy(particle);
230  break;
231 
232  case KPlus:
233  case KZero:
234  case KZeroBar:
235  case KMinus:
236  case KShort:
237  case KLong:
238  return computeKaonPotentialEnergy(particle);
239  break;
240 
241  case Photon:
242  return 0.0;
243  break;
244 
245  case DeltaPlusPlus:
246  return vDeltaPlusPlus;
247  break;
248  case DeltaPlus:
249  return vDeltaPlus;
250  break;
251  case DeltaZero:
252  return vDeltaZero;
253  break;
254  case DeltaMinus:
255  return vDeltaMinus;
256  break;
257  case Composite:
258  INCL_ERROR("No potential computed for particle of type Cluster.");
259  return 0.0;
260  break;
261  case UnknownParticle:
262  INCL_ERROR("Trying to compute potential energy for an unknown particle.");
263  return 0.0;
264  break;
265  }
266 
267  INCL_ERROR("There is no potential for this type of particle.");
268  return 0.0;
269  }
270 
271  }
272 }
273