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35 // 35 //
36 // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% << 36 // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
37 // 37 //
38 // MODULE: G4EMDissociationCrossSection.cc 38 // MODULE: G4EMDissociationCrossSection.cc
39 // 39 //
40 // Version: B.1 40 // Version: B.1
41 // Date: 15/04/04 41 // Date: 15/04/04
42 // Author: P R Truscott 42 // Author: P R Truscott
43 // Organisation: QinetiQ Ltd, UK 43 // Organisation: QinetiQ Ltd, UK
44 // Customer: ESA/ESTEC, NOORDWIJK 44 // Customer: ESA/ESTEC, NOORDWIJK
45 // Contract: 17191/03/NL/LvH 45 // Contract: 17191/03/NL/LvH
46 // 46 //
47 // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% << 47 // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
48 // 48 //
49 // CHANGE HISTORY 49 // CHANGE HISTORY
50 // -------------- 50 // --------------
51 // 51 //
52 // 17 October 2003, P R Truscott, QinetiQ Ltd, 52 // 17 October 2003, P R Truscott, QinetiQ Ltd, UK
53 // Created. 53 // Created.
54 // 54 //
55 // 15 March 2004, P R Truscott, QinetiQ Ltd, U 55 // 15 March 2004, P R Truscott, QinetiQ Ltd, UK
56 // Beta release 56 // Beta release
57 // 57 //
58 // 30 May 2005, J.P. Wellisch removed a compil << 58 // 30. May 2005, J.P. Wellisch removed a compilation warning on gcc 3.4 for gant4 7.1.
59 // geant4 7.1. <<
60 // 09 November 2010, V.Ivanchenko make class a <<
61 // set cross section for Hyd <<
62 // 59 //
63 // 17 August 2011, V.Ivanchenko, provide migra << 60 // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
64 // sections considering this c << 61 ////////////////////////////////////////////////////////////////////////////////
65 // <<
66 // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% <<
67 ////////////////////////////////////////////// <<
68 // 62 //
69 #include "G4EMDissociationCrossSection.hh" 63 #include "G4EMDissociationCrossSection.hh"
70 #include "G4PhysicalConstants.hh" << 64 #include "G4PhysicsFreeVector.hh"
71 #include "G4SystemOfUnits.hh" <<
72 #include "G4ParticleTable.hh" 65 #include "G4ParticleTable.hh"
73 #include "G4IonTable.hh" 66 #include "G4IonTable.hh"
74 #include "G4HadTmpUtil.hh" <<
75 #include "globals.hh" 67 #include "globals.hh"
76 #include "G4NistManager.hh" << 68 ////////////////////////////////////////////////////////////////////////////////
77 << 69 //
78 <<
79 G4EMDissociationCrossSection::G4EMDissociation 70 G4EMDissociationCrossSection::G4EMDissociationCrossSection ()
80 : G4VCrossSectionDataSet("Electromagnetic dis <<
81 { 71 {
82 // This function makes use of the class whic << 72 //
83 // spectrum, G4EMDissociationSpectrum. << 73 //
84 << 74 // This function makes use of the class which can sample the virtual photon
>> 75 // spectrum, G4EMDissociationSpectrum.
>> 76 //
85 thePhotonSpectrum = new G4EMDissociationSpec 77 thePhotonSpectrum = new G4EMDissociationSpectrum();
86 << 78 //
87 // Define other constants. << 79 //
88 << 80 // Define other constants.
>> 81 //
89 r0 = 1.18 * fermi; 82 r0 = 1.18 * fermi;
90 J = 36.8 * MeV; 83 J = 36.8 * MeV;
91 Qprime = 17.0 * MeV; 84 Qprime = 17.0 * MeV;
92 epsilon = 0.0768; 85 epsilon = 0.0768;
93 xd = 0.25; 86 xd = 0.25;
94 } 87 }
95 << 88 ////////////////////////////////////////////////////////////////////////////////
96 ////////////////////////////////////////////// << 89 //
97 <<
98 G4EMDissociationCrossSection::~G4EMDissociatio 90 G4EMDissociationCrossSection::~G4EMDissociationCrossSection()
99 { 91 {
100 delete thePhotonSpectrum; 92 delete thePhotonSpectrum;
101 } 93 }
102 ////////////////////////////////////////////// << 94 ///////////////////////////////////////////////////////////////////////////////
103 // 95 //
104 G4bool << 96 G4bool G4EMDissociationCrossSection::IsZAApplicable
105 G4EMDissociationCrossSection::IsElementApplica << 97 (const G4DynamicParticle* theDynamicParticle, G4double /*ZZ*/, G4double AA)
106 G4int /*ZZ*/, const G4Material*) <<
107 { 98 {
108 // 99 //
109 // The condition for the applicability of this 100 // The condition for the applicability of this class is that the projectile
110 // must be an ion and the target must have mor 101 // must be an ion and the target must have more than one nucleon. In reality
111 // the value of A for either the projectile or 102 // the value of A for either the projectile or target could be much higher,
112 // since for cases where both he projectile an 103 // since for cases where both he projectile and target are medium to small
113 // Z, the probability of the EMD process is, I 104 // Z, the probability of the EMD process is, I think, VERY small.
114 // 105 //
115 if (G4ParticleTable::GetParticleTable()->Get << 106 if (G4ParticleTable::GetParticleTable()->GetIonTable()->
>> 107 IsIon(theDynamicParticle->GetDefinition()) && AA > 1.0)
116 return true; 108 return true;
117 } else { << 109 else
118 return false; 110 return false;
119 } << 111 }
>> 112
>> 113 G4bool G4EMDissociationCrossSection::IsApplicable
>> 114 (const G4DynamicParticle* theDynamicParticle, const G4Element* theElement)
>> 115 {
>> 116 return IsZAApplicable(theDynamicParticle, 0., theElement->GetN());
120 } 117 }
121 118
122 ////////////////////////////////////////////// 119 //////////////////////////////////////////////////////////////////////////////
123 // 120 //
124 G4double G4EMDissociationCrossSection::GetElem << 121 G4double G4EMDissociationCrossSection::GetCrossSection
125 (const G4DynamicParticle* theDynamicParticle << 122 (const G4DynamicParticle* theDynamicParticle, const G4Element* theElement,
126 const G4Material*) << 123 G4double temperature)
127 { << 124 {
128 // VI protection for Hydrogen << 125 G4int nIso = theElement->GetNumberOfIsotopes();
129 if(1 >= Z) { return 0.0; } << 126 G4double crossSection = 0;
130 << 127
131 // Zero cross-section for particles with kin << 128 if (nIso) {
132 // possible abort signal from bad arithmetic << 129 G4double sig;
133 if ( theDynamicParticle->GetKineticEnergy() << 130 G4IsotopeVector* isoVector = theElement->GetIsotopeVector();
134 << 131 G4double* abundVector = theElement->GetRelativeAbundanceVector();
135 // << 132 G4double ZZ;
136 // Get relevant information about the projec << 133 G4double AA;
137 // velocity of the projectile. << 134
138 // << 135 for (G4int i = 0; i < nIso; i++) {
139 const G4ParticleDefinition *definitionP = th << 136 ZZ = G4double( (*isoVector)[i]->GetZ() );
>> 137 AA = G4double( (*isoVector)[i]->GetN() );
>> 138 sig = GetIsoZACrossSection(theDynamicParticle, ZZ, AA, temperature);
>> 139 crossSection += sig*abundVector[i];
>> 140 }
>> 141
>> 142 } else {
>> 143 crossSection =
>> 144 GetIsoZACrossSection(theDynamicParticle, theElement->GetZ(),
>> 145 theElement->GetN(), temperature);
>> 146 }
>> 147
>> 148 return crossSection;
>> 149 }
>> 150
>> 151
>> 152 G4double G4EMDissociationCrossSection::GetIsoZACrossSection
>> 153 (const G4DynamicParticle *theDynamicParticle, G4double ZZ, G4double AA,
>> 154 G4double /*temperature*/)
>> 155 {
>> 156 //
>> 157 //
>> 158 // Get relevant information about the projectile and target (A, Z) and
>> 159 // velocity of the projectile.
>> 160 //
>> 161 G4ParticleDefinition *definitionP = theDynamicParticle->GetDefinition();
140 G4double AP = definitionP->GetBaryonNumber 162 G4double AP = definitionP->GetBaryonNumber();
141 G4double ZP = definitionP->GetPDGCharge(); 163 G4double ZP = definitionP->GetPDGCharge();
142 G4double b = theDynamicParticle->GetBeta( << 164 G4double b = theDynamicParticle->Get4Momentum().beta();
143 if (b <= 0.0 && b >= 1.0) { return 0.0; } << 165 // G4double bsq = b * b;
144 166
145 G4double AT = G4NistManager::Instance()->G << 167 G4double AT = AA;
146 G4double ZT = (G4double)Z; << 168 G4double ZT = ZZ;
147 G4double bmin = thePhotonSpectrum->GetCloses 169 G4double bmin = thePhotonSpectrum->GetClosestApproach(AP, ZP, AT, ZT, b);
148 // << 170 //
149 // << 171 //
150 // Calculate the cross-section for the proje << 172 // Calculate the cross-section for the projectile and then the target. The
151 // information is returned in a G4PhysicsFre << 173 // information is returned in a G4PhysicsFreeVector, which separates out the
152 // cross-sections for the E1 and E2 moments << 174 // cross-sections for the E1 and E2 moments of the virtual photon field, and
153 // the energies (GDR and GQR). << 175 // the energies (GDR and GQR).
154 // << 176 //
155 G4PhysicsFreeVector *theProjectileCrossSecti << 177 G4PhysicsFreeVector *theProjectileCrossSections =
156 GetCrossSectionForProjectile (AP, ZP, AT, 178 GetCrossSectionForProjectile (AP, ZP, AT, ZT, b, bmin);
157 G4double crossSection = 179 G4double crossSection =
158 (*theProjectileCrossSections)[0]+(*theProj 180 (*theProjectileCrossSections)[0]+(*theProjectileCrossSections)[1];
159 delete theProjectileCrossSections; 181 delete theProjectileCrossSections;
160 G4PhysicsFreeVector *theTargetCrossSections << 182 G4PhysicsFreeVector *theTargetCrossSections =
161 GetCrossSectionForTarget (AP, ZP, AT, ZT, 183 GetCrossSectionForTarget (AP, ZP, AT, ZT, b, bmin);
162 crossSection += << 184 crossSection +=
163 (*theTargetCrossSections)[0]+(*theTargetCr 185 (*theTargetCrossSections)[0]+(*theTargetCrossSections)[1];
164 delete theTargetCrossSections; 186 delete theTargetCrossSections;
>> 187
165 return crossSection; 188 return crossSection;
166 } 189 }
167 ////////////////////////////////////////////// 190 ////////////////////////////////////////////////////////////////////////////////
168 // 191 //
169 G4PhysicsFreeVector * 192 G4PhysicsFreeVector *
170 G4EMDissociationCrossSection::GetCrossSectionF << 193 G4EMDissociationCrossSection::GetCrossSectionForProjectile (G4double AP,
171 G4double ZP, G4double /* AT */, G4double ZT, 194 G4double ZP, G4double /* AT */, G4double ZT, G4double b, G4double bmin)
172 { 195 {
173 // 196 //
174 // 197 //
175 // Use Wilson et al's approach to calculate th 198 // Use Wilson et al's approach to calculate the cross-sections due to the E1
176 // and E2 moments of the field at the giant di 199 // and E2 moments of the field at the giant dipole and quadrupole resonances
177 // respectively, Note that the algorithm is t 200 // respectively, Note that the algorithm is traditionally applied to the
178 // EMD break-up of the projectile in the field 201 // EMD break-up of the projectile in the field of the target, as is implemented
179 // here. 202 // here.
180 // 203 //
181 // Initialise variables and calculate the ener 204 // Initialise variables and calculate the energies for the GDR and GQR.
182 // 205 //
183 G4double AProot3 = G4Pow::GetInstance()->A13 << 206 G4double AProot3 = std::pow(AP,1.0/3.0);
184 G4double u = 3.0 * J / Qprime / AProot 207 G4double u = 3.0 * J / Qprime / AProot3;
185 G4double R0 = r0 * AProot3; 208 G4double R0 = r0 * AProot3;
186 G4double E_GDR = hbarc / std::sqrt(0.7*amu_ 209 G4double E_GDR = hbarc / std::sqrt(0.7*amu_c2*R0*R0/8.0/J*
187 (1.0 + u - (1.0 + epsilon + 3.0*u)/(1.0 + 210 (1.0 + u - (1.0 + epsilon + 3.0*u)/(1.0 + epsilon + u)*epsilon));
188 G4double E_GQR = 63.0 * MeV / AProot3; 211 G4double E_GQR = 63.0 * MeV / AProot3;
189 // 212 //
190 // 213 //
191 // Determine the virtual photon spectra at the 214 // Determine the virtual photon spectra at these energies.
192 // 215 //
193 G4double ZTsq = ZT * ZT; 216 G4double ZTsq = ZT * ZT;
194 G4double nE1 = ZTsq * 217 G4double nE1 = ZTsq *
195 thePhotonSpectrum->GetGeneralE1Spectrum(E_ 218 thePhotonSpectrum->GetGeneralE1Spectrum(E_GDR, b, bmin);
196 G4double nE2 = ZTsq * 219 G4double nE2 = ZTsq *
197 thePhotonSpectrum->GetGeneralE2Spectrum(E_ 220 thePhotonSpectrum->GetGeneralE2Spectrum(E_GQR, b, bmin);
198 // 221 //
199 // 222 //
200 // Now calculate the cross-section of the proj 223 // Now calculate the cross-section of the projectile for interaction with the
201 // E1 and E2 fields. 224 // E1 and E2 fields.
202 // 225 //
203 G4double sE1 = 60.0 * millibarn * MeV * (AP- 226 G4double sE1 = 60.0 * millibarn * MeV * (AP-ZP)*ZP/AP;
204 G4double sE2 = 0.22 * microbarn / MeV * ZP * 227 G4double sE2 = 0.22 * microbarn / MeV * ZP * AProot3 * AProot3;
205 if (AP > 100.0) sE2 *= 0.9; 228 if (AP > 100.0) sE2 *= 0.9;
206 else if (AP > 40.0) sE2 *= 0.6; 229 else if (AP > 40.0) sE2 *= 0.6;
207 else sE2 *= 0.3; 230 else sE2 *= 0.3;
208 // 231 //
209 // 232 //
210 // ... and multiply with the intensity of the 233 // ... and multiply with the intensity of the virtual photon spectra to get
211 // the probability of interaction. 234 // the probability of interaction.
212 // 235 //
213 G4PhysicsFreeVector *theCrossSectionVector = 236 G4PhysicsFreeVector *theCrossSectionVector = new G4PhysicsFreeVector(2);
214 theCrossSectionVector->PutValue(0, E_GDR, sE 237 theCrossSectionVector->PutValue(0, E_GDR, sE1*nE1);
215 theCrossSectionVector->PutValue(1, E_GQR, sE 238 theCrossSectionVector->PutValue(1, E_GQR, sE2*nE2*E_GQR*E_GQR);
216 << 239
217 return theCrossSectionVector; 240 return theCrossSectionVector;
218 } 241 }
219 <<
220 ////////////////////////////////////////////// 242 ////////////////////////////////////////////////////////////////////////////////
221 // 243 //
222 G4PhysicsFreeVector * 244 G4PhysicsFreeVector *
223 G4EMDissociationCrossSection::GetCrossSectionF << 245 G4EMDissociationCrossSection::GetCrossSectionForTarget (G4double AP,
224 G4double ZP, G4double AT, G4double ZT, G4dou 246 G4double ZP, G4double AT, G4double ZT, G4double b, G4double bmin)
225 { 247 {
226 // 248 //
>> 249 //
227 // This is a cheaky little member function to 250 // This is a cheaky little member function to calculate the probability of
228 // EMD for the target in the field of the proj 251 // EMD for the target in the field of the projectile ... just by reversing the
229 // A and Z's for the participants. 252 // A and Z's for the participants.
230 // 253 //
231 return GetCrossSectionForProjectile (AT, ZT, 254 return GetCrossSectionForProjectile (AT, ZT, AP, ZP, b, bmin);
232 } 255 }
233 <<
234 ////////////////////////////////////////////// 256 ////////////////////////////////////////////////////////////////////////////////
235 // 257 //
236 G4double 258 G4double
237 G4EMDissociationCrossSection::GetWilsonProbabi << 259 G4EMDissociationCrossSection::GetWilsonProbabilityForProtonDissociation
238 << 260 (G4double A, G4double Z)
239 { 261 {
240 // 262 //
>> 263 //
241 // This is a simple algorithm to choose whethe 264 // This is a simple algorithm to choose whether a proton or neutron is ejected
242 // from the nucleus in the EMD interaction. 265 // from the nucleus in the EMD interaction.
243 // 266 //
244 G4double p = 0.0; 267 G4double p = 0.0;
245 if (Z < 2.0) << 268 if (Z < 6.0)
246 p = 0.0; // To avoid to remove one proton <<
247 else if (Z < 6.0) <<
248 p = 0.5; 269 p = 0.5;
249 else if (Z < 8.0) 270 else if (Z < 8.0)
250 p = 0.6; 271 p = 0.6;
251 else if (Z < 14.0) 272 else if (Z < 14.0)
252 p = 0.7; 273 p = 0.7;
253 else 274 else
254 { 275 {
255 G4double p1 = (G4double) Z / (G4double) A; 276 G4double p1 = (G4double) Z / (G4double) A;
256 G4double p2 = 1.95*G4Exp(-0.075*Z); << 277 G4double p2 = 1.95*std::exp(-0.075*Z);
257 if (p1 < p2) p = p1; 278 if (p1 < p2) p = p1;
258 else p = p2; 279 else p = p2;
259 } 280 }
260 281
261 return p; 282 return p;
262 } 283 }
>> 284 ////////////////////////////////////////////////////////////////////////////////
>> 285 //
263 286