| Geant4 Cross Reference |
1 // 1 //
2 // ******************************************* 2 // ********************************************************************
3 // * License and Disclaimer << 3 // * DISCLAIMER *
4 // * 4 // * *
5 // * The Geant4 software is copyright of th << 5 // * The following disclaimer summarizes all the specific disclaimers *
6 // * the Geant4 Collaboration. It is provided << 6 // * of contributors to this software. The specific disclaimers,which *
7 // * conditions of the Geant4 Software License << 7 // * govern, are listed with their locations in: *
8 // * LICENSE and available at http://cern.ch/ << 8 // * http://cern.ch/geant4/license *
9 // * include a list of copyright holders. <<
10 // * 9 // * *
11 // * Neither the authors of this software syst 10 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing fin 11 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warran 12 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assum 13 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file << 14 // * use. *
16 // * for the full disclaimer and the limitatio <<
17 // * 15 // * *
18 // * This code implementation is the result << 16 // * This code implementation is the intellectual property of the *
19 // * technical work of the GEANT4 collaboratio << 17 // * GEANT4 collaboration. *
20 // * 18 // * *
21 // * Parts of this code which have been devel 19 // * Parts of this code which have been developed by QinetiQ Ltd *
22 // * under contract to the European Space Agen << 20 // * under contract to the European Space Agency (ESA) are the *
23 // * intellectual property of ESA. Rights to u 21 // * intellectual property of ESA. Rights to use, copy, modify and *
24 // * redistribute this software for general pu 22 // * redistribute this software for general public use are granted *
25 // * in compliance with any licensing, distrib 23 // * in compliance with any licensing, distribution and development *
26 // * policy adopted by the Geant4 Collaboratio 24 // * policy adopted by the Geant4 Collaboration. This code has been *
27 // * written by QinetiQ Ltd for the European S 25 // * written by QinetiQ Ltd for the European Space Agency, under ESA *
28 // * contract 17191/03/NL/LvH (Aurora Programm << 26 // * contract 17191/03/NL/LvH (Aurora Programme). *
29 // * 27 // * *
30 // * By using, copying, modifying or distri << 28 // * By copying, distributing or modifying the Program (or any work *
31 // * any work based on the software) you ag << 29 // * based on the Program) you indicate your acceptance of this *
32 // * use in resulting scientific publicati << 30 // * statement, and all its terms. *
33 // * acceptance of all terms of the Geant4 Sof <<
34 // ******************************************* 31 // ********************************************************************
35 // 32 //
36 // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% << 33 // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
37 // 34 //
38 // MODULE: G4EMDissociationCrossSection.cc 35 // MODULE: G4EMDissociationCrossSection.cc
39 // 36 //
40 // Version: B.1 37 // Version: B.1
41 // Date: 15/04/04 38 // Date: 15/04/04
42 // Author: P R Truscott 39 // Author: P R Truscott
43 // Organisation: QinetiQ Ltd, UK 40 // Organisation: QinetiQ Ltd, UK
44 // Customer: ESA/ESTEC, NOORDWIJK 41 // Customer: ESA/ESTEC, NOORDWIJK
45 // Contract: 17191/03/NL/LvH 42 // Contract: 17191/03/NL/LvH
46 // 43 //
47 // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% << 44 // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
48 // 45 //
49 // CHANGE HISTORY 46 // CHANGE HISTORY
50 // -------------- 47 // --------------
51 // 48 //
52 // 17 October 2003, P R Truscott, QinetiQ Ltd, 49 // 17 October 2003, P R Truscott, QinetiQ Ltd, UK
53 // Created. 50 // Created.
54 // 51 //
55 // 15 March 2004, P R Truscott, QinetiQ Ltd, U 52 // 15 March 2004, P R Truscott, QinetiQ Ltd, UK
56 // Beta release 53 // Beta release
57 // 54 //
58 // 30 May 2005, J.P. Wellisch removed a compil << 55 // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
59 // geant4 7.1. << 56 ////////////////////////////////////////////////////////////////////////////////
60 // 09 November 2010, V.Ivanchenko make class a <<
61 // set cross section for Hyd <<
62 // <<
63 // 17 August 2011, V.Ivanchenko, provide migra <<
64 // sections considering this c <<
65 // <<
66 // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% <<
67 ////////////////////////////////////////////// <<
68 // 57 //
69 #include "G4EMDissociationCrossSection.hh" 58 #include "G4EMDissociationCrossSection.hh"
70 #include "G4PhysicalConstants.hh" << 59 #include "G4PhysicsFreeVector.hh"
71 #include "G4SystemOfUnits.hh" <<
72 #include "G4ParticleTable.hh" 60 #include "G4ParticleTable.hh"
73 #include "G4IonTable.hh" 61 #include "G4IonTable.hh"
74 #include "G4HadTmpUtil.hh" <<
75 #include "globals.hh" 62 #include "globals.hh"
76 #include "G4NistManager.hh" << 63 ////////////////////////////////////////////////////////////////////////////////
77 << 64 //
78 <<
79 G4EMDissociationCrossSection::G4EMDissociation 65 G4EMDissociationCrossSection::G4EMDissociationCrossSection ()
80 : G4VCrossSectionDataSet("Electromagnetic dis <<
81 { 66 {
82 // This function makes use of the class whic << 67 //
83 // spectrum, G4EMDissociationSpectrum. << 68 //
84 << 69 // This function makes use of the class which can sample the virtual photon
>> 70 // spectrum, G4EMDissociationSpectrum.
>> 71 //
85 thePhotonSpectrum = new G4EMDissociationSpec 72 thePhotonSpectrum = new G4EMDissociationSpectrum();
86 << 73 //
87 // Define other constants. << 74 //
88 << 75 // Define other constants.
>> 76 //
89 r0 = 1.18 * fermi; 77 r0 = 1.18 * fermi;
90 J = 36.8 * MeV; 78 J = 36.8 * MeV;
91 Qprime = 17.0 * MeV; 79 Qprime = 17.0 * MeV;
92 epsilon = 0.0768; 80 epsilon = 0.0768;
93 xd = 0.25; 81 xd = 0.25;
94 } 82 }
95 << 83 ////////////////////////////////////////////////////////////////////////////////
96 ////////////////////////////////////////////// << 84 //
97 <<
98 G4EMDissociationCrossSection::~G4EMDissociatio 85 G4EMDissociationCrossSection::~G4EMDissociationCrossSection()
99 { 86 {
100 delete thePhotonSpectrum; 87 delete thePhotonSpectrum;
101 } 88 }
102 ////////////////////////////////////////////// << 89 ////////////////////////////////////////////////////////////////////////////////
103 // 90 //
104 G4bool << 91 G4bool G4EMDissociationCrossSection::IsApplicable
105 G4EMDissociationCrossSection::IsElementApplica << 92 (const G4DynamicParticle *theDynamicParticle, const G4Element* theElement)
106 G4int /*ZZ*/, const G4Material*) <<
107 { 93 {
108 // 94 //
>> 95 //
109 // The condition for the applicability of this 96 // The condition for the applicability of this class is that the projectile
110 // must be an ion and the target must have mor 97 // 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 98 // the value of A for either the projectile or target could be much higher,
112 // since for cases where both he projectile an 99 // since for cases where both he projectile and target are medium to small
113 // Z, the probability of the EMD process is, I 100 // Z, the probability of the EMD process is, I think, VERY small.
114 // 101 //
115 if (G4ParticleTable::GetParticleTable()->Get << 102 if (G4ParticleTable::GetParticleTable()->GetIonTable()->
>> 103 IsIon(theDynamicParticle->GetDefinition()) && theElement->GetN() > 1.0)
116 return true; 104 return true;
117 } else { << 105 else
118 return false; 106 return false;
119 } <<
120 } 107 }
121 << 108 ////////////////////////////////////////////////////////////////////////////////
122 ////////////////////////////////////////////// <<
123 // 109 //
124 G4double G4EMDissociationCrossSection::GetElem << 110 G4double G4EMDissociationCrossSection::GetCrossSection
125 (const G4DynamicParticle* theDynamicParticle << 111 (const G4DynamicParticle *theDynamicParticle, const G4Element* theElement,
126 const G4Material*) << 112 G4double )
127 { 113 {
128 // VI protection for Hydrogen << 114 //
129 if(1 >= Z) { return 0.0; } << 115 //
130 << 116 // Get relevant information about the projectile and target (A, Z) and
131 // Zero cross-section for particles with kin << 117 // velocity of the projectile.
132 // possible abort signal from bad arithmetic << 118 //
133 if ( theDynamicParticle->GetKineticEnergy() << 119 G4ParticleDefinition *definitionP = theDynamicParticle->GetDefinition();
134 <<
135 // <<
136 // Get relevant information about the projec <<
137 // velocity of the projectile. <<
138 // <<
139 const G4ParticleDefinition *definitionP = th <<
140 G4double AP = definitionP->GetBaryonNumber 120 G4double AP = definitionP->GetBaryonNumber();
141 G4double ZP = definitionP->GetPDGCharge(); 121 G4double ZP = definitionP->GetPDGCharge();
142 G4double b = theDynamicParticle->GetBeta( << 122 G4double b = theDynamicParticle->Get4Momentum().beta();
143 if (b <= 0.0 && b >= 1.0) { return 0.0; } << 123 // G4double bsq = b * b;
144 124
145 G4double AT = G4NistManager::Instance()->G << 125 G4double AT = theElement->GetN();
146 G4double ZT = (G4double)Z; << 126 G4double ZT = theElement->GetZ();
147 G4double bmin = thePhotonSpectrum->GetCloses 127 G4double bmin = thePhotonSpectrum->GetClosestApproach(AP, ZP, AT, ZT, b);
148 // << 128 //
149 // << 129 //
150 // Calculate the cross-section for the proje << 130 // Calculate the cross-section for the projectile and then the target. The
151 // information is returned in a G4PhysicsFre << 131 // information is returned in a G4PhysicsFreeVector, which separates out the
152 // cross-sections for the E1 and E2 moments << 132 // cross-sections for the E1 and E2 moments of the virtual photon field, and
153 // the energies (GDR and GQR). << 133 // the energies (GDR and GQR).
154 // << 134 //
155 G4PhysicsFreeVector *theProjectileCrossSecti << 135 G4PhysicsFreeVector *theProjectileCrossSections =
156 GetCrossSectionForProjectile (AP, ZP, AT, 136 GetCrossSectionForProjectile (AP, ZP, AT, ZT, b, bmin);
157 G4double crossSection = 137 G4double crossSection =
158 (*theProjectileCrossSections)[0]+(*theProj 138 (*theProjectileCrossSections)[0]+(*theProjectileCrossSections)[1];
159 delete theProjectileCrossSections; 139 delete theProjectileCrossSections;
160 G4PhysicsFreeVector *theTargetCrossSections << 140 G4PhysicsFreeVector *theTargetCrossSections =
161 GetCrossSectionForTarget (AP, ZP, AT, ZT, 141 GetCrossSectionForTarget (AP, ZP, AT, ZT, b, bmin);
162 crossSection += << 142 crossSection +=
163 (*theTargetCrossSections)[0]+(*theTargetCr 143 (*theTargetCrossSections)[0]+(*theTargetCrossSections)[1];
164 delete theTargetCrossSections; 144 delete theTargetCrossSections;
>> 145
165 return crossSection; 146 return crossSection;
166 } 147 }
167 ////////////////////////////////////////////// 148 ////////////////////////////////////////////////////////////////////////////////
168 // 149 //
169 G4PhysicsFreeVector * 150 G4PhysicsFreeVector *
170 G4EMDissociationCrossSection::GetCrossSectionF << 151 G4EMDissociationCrossSection::GetCrossSectionForProjectile (G4double AP,
171 G4double ZP, G4double /* AT */, G4double ZT, << 152 G4double ZP, G4double AT, G4double ZT, G4double b, G4double bmin)
172 { 153 {
173 // 154 //
174 // 155 //
175 // Use Wilson et al's approach to calculate th 156 // 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 157 // and E2 moments of the field at the giant dipole and quadrupole resonances
177 // respectively, Note that the algorithm is t 158 // respectively, Note that the algorithm is traditionally applied to the
178 // EMD break-up of the projectile in the field 159 // EMD break-up of the projectile in the field of the target, as is implemented
179 // here. 160 // here.
180 // 161 //
181 // Initialise variables and calculate the ener 162 // Initialise variables and calculate the energies for the GDR and GQR.
182 // 163 //
183 G4double AProot3 = G4Pow::GetInstance()->A13 << 164 G4double AProot3 = pow(AP,1.0/3.0);
184 G4double u = 3.0 * J / Qprime / AProot 165 G4double u = 3.0 * J / Qprime / AProot3;
185 G4double R0 = r0 * AProot3; 166 G4double R0 = r0 * AProot3;
186 G4double E_GDR = hbarc / std::sqrt(0.7*amu_ << 167 G4double E_GDR = hbarc / sqrt(0.7*amu_c2*R0*R0/8.0/J*
187 (1.0 + u - (1.0 + epsilon + 3.0*u)/(1.0 + 168 (1.0 + u - (1.0 + epsilon + 3.0*u)/(1.0 + epsilon + u)*epsilon));
188 G4double E_GQR = 63.0 * MeV / AProot3; 169 G4double E_GQR = 63.0 * MeV / AProot3;
189 // 170 //
190 // 171 //
191 // Determine the virtual photon spectra at the 172 // Determine the virtual photon spectra at these energies.
192 // 173 //
193 G4double ZTsq = ZT * ZT; 174 G4double ZTsq = ZT * ZT;
194 G4double nE1 = ZTsq * 175 G4double nE1 = ZTsq *
195 thePhotonSpectrum->GetGeneralE1Spectrum(E_ 176 thePhotonSpectrum->GetGeneralE1Spectrum(E_GDR, b, bmin);
196 G4double nE2 = ZTsq * 177 G4double nE2 = ZTsq *
197 thePhotonSpectrum->GetGeneralE2Spectrum(E_ 178 thePhotonSpectrum->GetGeneralE2Spectrum(E_GQR, b, bmin);
198 // 179 //
199 // 180 //
200 // Now calculate the cross-section of the proj 181 // Now calculate the cross-section of the projectile for interaction with the
201 // E1 and E2 fields. 182 // E1 and E2 fields.
202 // 183 //
203 G4double sE1 = 60.0 * millibarn * MeV * (AP- 184 G4double sE1 = 60.0 * millibarn * MeV * (AP-ZP)*ZP/AP;
204 G4double sE2 = 0.22 * microbarn / MeV * ZP * 185 G4double sE2 = 0.22 * microbarn / MeV * ZP * AProot3 * AProot3;
205 if (AP > 100.0) sE2 *= 0.9; 186 if (AP > 100.0) sE2 *= 0.9;
206 else if (AP > 40.0) sE2 *= 0.6; 187 else if (AP > 40.0) sE2 *= 0.6;
207 else sE2 *= 0.3; 188 else sE2 *= 0.3;
208 // 189 //
209 // 190 //
210 // ... and multiply with the intensity of the 191 // ... and multiply with the intensity of the virtual photon spectra to get
211 // the probability of interaction. 192 // the probability of interaction.
212 // 193 //
213 G4PhysicsFreeVector *theCrossSectionVector = 194 G4PhysicsFreeVector *theCrossSectionVector = new G4PhysicsFreeVector(2);
214 theCrossSectionVector->PutValue(0, E_GDR, sE 195 theCrossSectionVector->PutValue(0, E_GDR, sE1*nE1);
215 theCrossSectionVector->PutValue(1, E_GQR, sE 196 theCrossSectionVector->PutValue(1, E_GQR, sE2*nE2*E_GQR*E_GQR);
216 << 197
217 return theCrossSectionVector; 198 return theCrossSectionVector;
218 } 199 }
219 <<
220 ////////////////////////////////////////////// 200 ////////////////////////////////////////////////////////////////////////////////
221 // 201 //
222 G4PhysicsFreeVector * 202 G4PhysicsFreeVector *
223 G4EMDissociationCrossSection::GetCrossSectionF << 203 G4EMDissociationCrossSection::GetCrossSectionForTarget (G4double AP,
224 G4double ZP, G4double AT, G4double ZT, G4dou 204 G4double ZP, G4double AT, G4double ZT, G4double b, G4double bmin)
225 { 205 {
226 // 206 //
>> 207 //
227 // This is a cheaky little member function to 208 // This is a cheaky little member function to calculate the probability of
228 // EMD for the target in the field of the proj 209 // EMD for the target in the field of the projectile ... just by reversing the
229 // A and Z's for the participants. 210 // A and Z's for the participants.
230 // 211 //
231 return GetCrossSectionForProjectile (AT, ZT, 212 return GetCrossSectionForProjectile (AT, ZT, AP, ZP, b, bmin);
232 } 213 }
233 <<
234 ////////////////////////////////////////////// 214 ////////////////////////////////////////////////////////////////////////////////
235 // 215 //
236 G4double 216 G4double
237 G4EMDissociationCrossSection::GetWilsonProbabi << 217 G4EMDissociationCrossSection::GetWilsonProbabilityForProtonDissociation
238 << 218 (G4double A, G4double Z)
239 { 219 {
240 // 220 //
>> 221 //
241 // This is a simple algorithm to choose whethe 222 // This is a simple algorithm to choose whether a proton or neutron is ejected
242 // from the nucleus in the EMD interaction. 223 // from the nucleus in the EMD interaction.
243 // 224 //
244 G4double p = 0.0; 225 G4double p = 0.0;
245 if (Z < 2.0) << 226 if (Z < 6.0)
246 p = 0.0; // To avoid to remove one proton <<
247 else if (Z < 6.0) <<
248 p = 0.5; 227 p = 0.5;
249 else if (Z < 8.0) 228 else if (Z < 8.0)
250 p = 0.6; 229 p = 0.6;
251 else if (Z < 14.0) 230 else if (Z < 14.0)
252 p = 0.7; 231 p = 0.7;
253 else 232 else
254 { 233 {
255 G4double p1 = (G4double) Z / (G4double) A; 234 G4double p1 = (G4double) Z / (G4double) A;
256 G4double p2 = 1.95*G4Exp(-0.075*Z); << 235 G4double p2 = 1.95*exp(-0.075*Z);
257 if (p1 < p2) p = p1; 236 if (p1 < p2) p = p1;
258 else p = p2; 237 else p = p2;
259 } 238 }
260 239
261 return p; 240 return p;
262 } 241 }
>> 242 ////////////////////////////////////////////////////////////////////////////////
>> 243 //
263 244