1 | // |
---|
2 | // ******************************************************************** |
---|
3 | // * License and Disclaimer * |
---|
4 | // * * |
---|
5 | // * The Geant4 software is copyright of the Copyright Holders of * |
---|
6 | // * the Geant4 Collaboration. It is provided under the terms and * |
---|
7 | // * conditions of the Geant4 Software License, included in the file * |
---|
8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
---|
9 | // * include a list of copyright holders. * |
---|
10 | // * * |
---|
11 | // * Neither the authors of this software system, nor their employing * |
---|
12 | // * institutes,nor the agencies providing financial support for this * |
---|
13 | // * work make any representation or warranty, express or implied, * |
---|
14 | // * regarding this software system or assume any liability for its * |
---|
15 | // * use. Please see the license in the file LICENSE and URL above * |
---|
16 | // * for the full disclaimer and the limitation of liability. * |
---|
17 | // * * |
---|
18 | // * This code implementation is the result of the scientific and * |
---|
19 | // * technical work of the GEANT4 collaboration. * |
---|
20 | // * By using, copying, modifying or distributing the software (or * |
---|
21 | // * any work based on the software) you agree to acknowledge its * |
---|
22 | // * use in resulting scientific publications, and indicate your * |
---|
23 | // * acceptance of all terms of the Geant4 Software license. * |
---|
24 | // ******************************************************************** |
---|
25 | // |
---|
26 | // $Id: G4PenelopeGammaConversionModel.cc,v 1.6 2009/06/11 15:47:08 mantero Exp $ |
---|
27 | // GEANT4 tag $Name: geant4-09-03 $ |
---|
28 | // |
---|
29 | // Author: Luciano Pandola |
---|
30 | // |
---|
31 | // History: |
---|
32 | // -------- |
---|
33 | // 06 Oct 2008 L Pandola Migration from process to model |
---|
34 | // 17 Apr 2009 V Ivanchenko Cleanup initialisation and generation of secondaries: |
---|
35 | // - apply internal high-energy limit only in constructor |
---|
36 | // - do not apply low-energy limit (default is 0) |
---|
37 | // - do not apply production threshold on level of the model |
---|
38 | // 19 May 2009 L Pandola Explicitely set to zero pointers deleted in |
---|
39 | // Initialise(), since they might be checked later on |
---|
40 | // |
---|
41 | |
---|
42 | #include "G4PenelopeGammaConversionModel.hh" |
---|
43 | #include "G4ParticleDefinition.hh" |
---|
44 | #include "G4MaterialCutsCouple.hh" |
---|
45 | #include "G4ProductionCutsTable.hh" |
---|
46 | #include "G4DynamicParticle.hh" |
---|
47 | #include "G4Element.hh" |
---|
48 | #include "G4Gamma.hh" |
---|
49 | #include "G4Electron.hh" |
---|
50 | #include "G4Positron.hh" |
---|
51 | #include "G4CrossSectionHandler.hh" |
---|
52 | |
---|
53 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
54 | |
---|
55 | |
---|
56 | G4PenelopeGammaConversionModel::G4PenelopeGammaConversionModel(const G4ParticleDefinition*, |
---|
57 | const G4String& nam) |
---|
58 | :G4VEmModel(nam),fTheScreeningRadii(0),crossSectionHandler(0),isInitialised(false) |
---|
59 | { |
---|
60 | fIntrinsicLowEnergyLimit = 2.0*electron_mass_c2; |
---|
61 | fIntrinsicHighEnergyLimit = 100.0*GeV; |
---|
62 | fSmallEnergy = 1.1*MeV; |
---|
63 | |
---|
64 | // SetLowEnergyLimit(fIntrinsicLowEnergyLimit); |
---|
65 | SetHighEnergyLimit(fIntrinsicHighEnergyLimit); |
---|
66 | // |
---|
67 | verboseLevel= 0; |
---|
68 | // Verbosity scale: |
---|
69 | // 0 = nothing |
---|
70 | // 1 = warning for energy non-conservation |
---|
71 | // 2 = details of energy budget |
---|
72 | // 3 = calculation of cross sections, file openings, sampling of atoms |
---|
73 | // 4 = entering in methods |
---|
74 | } |
---|
75 | |
---|
76 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
77 | |
---|
78 | G4PenelopeGammaConversionModel::~G4PenelopeGammaConversionModel() |
---|
79 | { |
---|
80 | if (crossSectionHandler) delete crossSectionHandler; |
---|
81 | if (fTheScreeningRadii) delete fTheScreeningRadii; |
---|
82 | } |
---|
83 | |
---|
84 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
85 | |
---|
86 | void G4PenelopeGammaConversionModel::Initialise(const G4ParticleDefinition*, |
---|
87 | const G4DataVector& ) |
---|
88 | { |
---|
89 | if (verboseLevel > 3) |
---|
90 | G4cout << "Calling G4PenelopeGammaConversionModel::Initialise()" << G4endl; |
---|
91 | |
---|
92 | //Delete the old cross section handler, if necessary |
---|
93 | if (crossSectionHandler) |
---|
94 | { |
---|
95 | crossSectionHandler->Clear(); |
---|
96 | delete crossSectionHandler; |
---|
97 | crossSectionHandler = 0; |
---|
98 | } |
---|
99 | |
---|
100 | //Re-initialize cross section handler |
---|
101 | crossSectionHandler = new G4CrossSectionHandler(); |
---|
102 | crossSectionHandler->Initialise(0,fIntrinsicLowEnergyLimit,HighEnergyLimit(),400); |
---|
103 | crossSectionHandler->Clear(); |
---|
104 | G4String crossSectionFile = "penelope/pp-cs-pen-"; |
---|
105 | crossSectionHandler->LoadData(crossSectionFile); |
---|
106 | //This is used to retrieve cross section values later on |
---|
107 | crossSectionHandler->BuildMeanFreePathForMaterials(); |
---|
108 | |
---|
109 | if (verboseLevel > 2) |
---|
110 | G4cout << "Loaded cross section files for PenelopeGammaConversion" << G4endl; |
---|
111 | |
---|
112 | if (verboseLevel > 0) { |
---|
113 | G4cout << "Penelope Gamma Conversion model is initialized " << G4endl |
---|
114 | << "Energy range: " |
---|
115 | << LowEnergyLimit() / MeV << " MeV - " |
---|
116 | << HighEnergyLimit() / GeV << " GeV" |
---|
117 | << G4endl; |
---|
118 | } |
---|
119 | |
---|
120 | if(isInitialised) return; |
---|
121 | fParticleChange = GetParticleChangeForGamma(); |
---|
122 | isInitialised = true; |
---|
123 | } |
---|
124 | |
---|
125 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
126 | |
---|
127 | G4double G4PenelopeGammaConversionModel::ComputeCrossSectionPerAtom( |
---|
128 | const G4ParticleDefinition*, |
---|
129 | G4double energy, |
---|
130 | G4double Z, G4double, |
---|
131 | G4double, G4double) |
---|
132 | { |
---|
133 | // |
---|
134 | // Penelope model. |
---|
135 | // Cross section (including triplet production) read from database and managed |
---|
136 | // through the G4CrossSectionHandler utility. Cross section data are from |
---|
137 | // M.J. Berger and J.H. Hubbel (XCOM), Report NBSIR 887-3598 |
---|
138 | // |
---|
139 | |
---|
140 | if (verboseLevel > 3) |
---|
141 | G4cout << "Calling ComputeCrossSectionPerAtom() of G4PenelopePhotoElectricModel" << G4endl; |
---|
142 | |
---|
143 | G4int iZ = (G4int) Z; |
---|
144 | // if (!crossSectionHandler) //VI: should not be checked in run time |
---|
145 | // { |
---|
146 | // G4cout << "G4PenelopeGammaConversionModel::ComputeCrossSectionPerAtom" << G4endl; |
---|
147 | // G4cout << "The cross section handler is not correctly initialized" << G4endl; |
---|
148 | // G4Exception(); |
---|
149 | // } |
---|
150 | G4double cs = crossSectionHandler->FindValue(iZ,energy); |
---|
151 | |
---|
152 | if (verboseLevel > 2) |
---|
153 | G4cout << "Gamma conversion cross section at " << energy/MeV << " MeV for Z=" << Z << |
---|
154 | " = " << cs/barn << " barn" << G4endl; |
---|
155 | return cs; |
---|
156 | } |
---|
157 | |
---|
158 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
159 | |
---|
160 | void |
---|
161 | G4PenelopeGammaConversionModel::SampleSecondaries(std::vector<G4DynamicParticle*>* fvect, |
---|
162 | const G4MaterialCutsCouple* couple, |
---|
163 | const G4DynamicParticle* aDynamicGamma, |
---|
164 | G4double, |
---|
165 | G4double) |
---|
166 | { |
---|
167 | // |
---|
168 | // Penelope model. |
---|
169 | // Final state is sampled according to the Bethe-Heitler model with Coulomb |
---|
170 | // corrections, according to the semi-empirical model of |
---|
171 | // J. Baro' et al., Radiat. Phys. Chem. 44 (1994) 531. |
---|
172 | // |
---|
173 | // The model uses the high energy Coulomb correction from |
---|
174 | // H. Davies et al., Phys. Rev. 93 (1954) 788 |
---|
175 | // and atomic screening radii tabulated from |
---|
176 | // J.H. Hubbel et al., J. Phys. Chem. Ref. Data 9 (1980) 1023 |
---|
177 | // for Z= 1 to 92. This managed in this model by the method |
---|
178 | // GetScreeningRadius(). |
---|
179 | // |
---|
180 | if (verboseLevel > 3) |
---|
181 | G4cout << "Calling SamplingSecondaries() of G4PenelopeGammaConversionModel" << G4endl; |
---|
182 | |
---|
183 | G4double photonEnergy = aDynamicGamma->GetKineticEnergy(); |
---|
184 | |
---|
185 | // Always kill primary |
---|
186 | fParticleChange->ProposeTrackStatus(fStopAndKill); |
---|
187 | fParticleChange->SetProposedKineticEnergy(0.); |
---|
188 | |
---|
189 | if (photonEnergy <= fIntrinsicLowEnergyLimit) |
---|
190 | { |
---|
191 | fParticleChange->ProposeLocalEnergyDeposit(photonEnergy); |
---|
192 | return ; |
---|
193 | } |
---|
194 | |
---|
195 | G4ParticleMomentum photonDirection = aDynamicGamma->GetMomentumDirection(); |
---|
196 | |
---|
197 | G4double eps ; |
---|
198 | G4double eki = electron_mass_c2 / photonEnergy ; |
---|
199 | |
---|
200 | // Do it fast if photon energy < 1.1 MeV |
---|
201 | if (photonEnergy < fSmallEnergy ) |
---|
202 | { |
---|
203 | eps = eki + (1-2*eki) * G4UniformRand(); |
---|
204 | } |
---|
205 | else |
---|
206 | { |
---|
207 | // Select randomly one element in the current material |
---|
208 | if (verboseLevel > 2) |
---|
209 | G4cout << "Going to select element in " << couple->GetMaterial()->GetName() << G4endl; |
---|
210 | //use crossSectionHandler instead of G4EmElementSelector because in this case |
---|
211 | //the dimension of the table is equal to the dimension of the database |
---|
212 | //(less interpolation errors) |
---|
213 | G4int Z_int = crossSectionHandler->SelectRandomAtom(couple,photonEnergy); |
---|
214 | if (verboseLevel > 2) |
---|
215 | G4cout << "Selected Z = " << Z_int << G4endl; |
---|
216 | |
---|
217 | //Low energy and Coulomb corrections |
---|
218 | G4double Z=(G4double) Z_int; |
---|
219 | G4double ZAlpha = Z*fine_structure_const; |
---|
220 | G4double ScreenRadius = GetScreeningRadius(Z); |
---|
221 | G4double funct1=0,g0=0; |
---|
222 | G4double g1min=0,g2min=0; |
---|
223 | funct1 = 4.0*std::log(ScreenRadius); |
---|
224 | g0 = funct1-4*CoulombCorrection(ZAlpha)+LowEnergyCorrection(ZAlpha,eki); |
---|
225 | G4double bmin = 2*eki*ScreenRadius; |
---|
226 | std::vector<G4double> ScreenFunctionValues = ScreenFunction(bmin); |
---|
227 | if (ScreenFunctionValues.size() != 2) |
---|
228 | { |
---|
229 | G4cout << "G4PenelopeGammaConversionModel::SampleSecondaries" << G4endl; |
---|
230 | G4cout << "ScreenFunction did not return 2 values! Something wrong! " << G4endl; |
---|
231 | G4Exception(); |
---|
232 | } |
---|
233 | g1min=g0+ScreenFunctionValues[0]; |
---|
234 | g2min=g0+ScreenFunctionValues[1]; |
---|
235 | G4double xr,a1,p1; |
---|
236 | xr=0.5-eki; |
---|
237 | a1=(2.0/3.0)*g1min*xr*xr; |
---|
238 | p1=a1/(a1+g2min); |
---|
239 | |
---|
240 | //Random sampling of eps |
---|
241 | G4double rand1,rand2,rand3,b; |
---|
242 | G4double g1; |
---|
243 | |
---|
244 | do{ |
---|
245 | rand1 = G4UniformRand(); |
---|
246 | if (rand1 < p1) { |
---|
247 | rand2 = 2.0*G4UniformRand()-1.0; |
---|
248 | if (rand2 < 0) { |
---|
249 | eps = 0.5 - xr*std::pow(std::abs(rand2),(1./3.)); |
---|
250 | } |
---|
251 | else |
---|
252 | { |
---|
253 | eps = 0.5 + xr*std::pow(rand2,(1./3.)); |
---|
254 | } |
---|
255 | b = (eki*ScreenRadius)/(2*eps*(1.0-eps)); |
---|
256 | std::vector<G4double> ScreenFunctionSampling = ScreenFunction(b); |
---|
257 | g1 = g0+ScreenFunctionSampling[0]; |
---|
258 | if (g1 < 0) g1=0; |
---|
259 | rand3 = G4UniformRand()*g1min; |
---|
260 | } |
---|
261 | else |
---|
262 | { |
---|
263 | eps = eki+2.0*xr*G4UniformRand(); |
---|
264 | b = (eki*ScreenRadius)/(2*eps*(1.0-eps)); |
---|
265 | std::vector<G4double> ScreenFunctionSampling = ScreenFunction(b); |
---|
266 | g1 = g0+ScreenFunctionSampling[1]; |
---|
267 | if (g1 < 0) g1=0; |
---|
268 | rand3 = G4UniformRand()*g2min; |
---|
269 | } |
---|
270 | } while (rand3>g1); |
---|
271 | } //End of eps sampling |
---|
272 | |
---|
273 | G4double electronTotEnergy = eps*photonEnergy; |
---|
274 | G4double positronTotEnergy = (1.0-eps)*photonEnergy; |
---|
275 | |
---|
276 | // Scattered electron (positron) angles. ( Z - axis along the parent photon) |
---|
277 | |
---|
278 | //electron kinematics |
---|
279 | G4double costheta_el,costheta_po; |
---|
280 | G4double phi_el,phi_po; |
---|
281 | G4double electronKineEnergy = std::max(0.,electronTotEnergy - electron_mass_c2) ; |
---|
282 | costheta_el = G4UniformRand()*2.0-1.0; |
---|
283 | G4double kk = std::sqrt(electronKineEnergy*(electronKineEnergy+2.*electron_mass_c2)); |
---|
284 | costheta_el = (costheta_el*electronTotEnergy+kk)/(electronTotEnergy+costheta_el*kk); |
---|
285 | phi_el = twopi * G4UniformRand() ; |
---|
286 | G4double dirX_el = std::sqrt(1.-costheta_el*costheta_el) * std::cos(phi_el); |
---|
287 | G4double dirY_el = std::sqrt(1.-costheta_el*costheta_el) * std::sin(phi_el); |
---|
288 | G4double dirZ_el = costheta_el; |
---|
289 | |
---|
290 | //positron kinematics |
---|
291 | G4double positronKineEnergy = std::max(0.,positronTotEnergy - electron_mass_c2) ; |
---|
292 | costheta_po = G4UniformRand()*2.0-1.0; |
---|
293 | kk = std::sqrt(positronKineEnergy*(positronKineEnergy+2.*electron_mass_c2)); |
---|
294 | costheta_po = (costheta_po*positronTotEnergy+kk)/(positronTotEnergy+costheta_po*kk); |
---|
295 | phi_po = twopi * G4UniformRand() ; |
---|
296 | G4double dirX_po = std::sqrt(1.-costheta_po*costheta_po) * std::cos(phi_po); |
---|
297 | G4double dirY_po = std::sqrt(1.-costheta_po*costheta_po) * std::sin(phi_po); |
---|
298 | G4double dirZ_po = costheta_po; |
---|
299 | |
---|
300 | // Kinematics of the created pair: |
---|
301 | // the electron and positron are assumed to have a symetric angular |
---|
302 | // distribution with respect to the Z axis along the parent photon |
---|
303 | G4double localEnergyDeposit = 0. ; |
---|
304 | |
---|
305 | //Generate explicitely the electron in the pair, only if it is > threshold |
---|
306 | //VI: applying cut here provides inconsistency |
---|
307 | |
---|
308 | if (electronKineEnergy > 0.0) |
---|
309 | { |
---|
310 | G4ThreeVector electronDirection ( dirX_el, dirY_el, dirZ_el); |
---|
311 | electronDirection.rotateUz(photonDirection); |
---|
312 | G4DynamicParticle* electron = new G4DynamicParticle (G4Electron::Electron(), |
---|
313 | electronDirection, |
---|
314 | electronKineEnergy); |
---|
315 | fvect->push_back(electron); |
---|
316 | } |
---|
317 | else |
---|
318 | { |
---|
319 | localEnergyDeposit += electronKineEnergy; |
---|
320 | electronKineEnergy = 0; |
---|
321 | } |
---|
322 | |
---|
323 | //Generate the positron. Real particle in any case, because it will annihilate. If below |
---|
324 | //threshold, produce it at rest |
---|
325 | // VI: here there was a bug - positron and electron cuts are different |
---|
326 | if (positronKineEnergy < 0.0) |
---|
327 | { |
---|
328 | localEnergyDeposit += positronKineEnergy; |
---|
329 | positronKineEnergy = 0; //produce it at rest |
---|
330 | } |
---|
331 | G4ThreeVector positronDirection(dirX_po,dirY_po,dirZ_po); |
---|
332 | positronDirection.rotateUz(photonDirection); |
---|
333 | G4DynamicParticle* positron = new G4DynamicParticle(G4Positron::Positron(), |
---|
334 | positronDirection, positronKineEnergy); |
---|
335 | fvect->push_back(positron); |
---|
336 | |
---|
337 | //Add rest of energy to the local energy deposit |
---|
338 | fParticleChange->ProposeLocalEnergyDeposit(localEnergyDeposit); |
---|
339 | |
---|
340 | if (verboseLevel > 1) |
---|
341 | { |
---|
342 | G4cout << "-----------------------------------------------------------" << G4endl; |
---|
343 | G4cout << "Energy balance from G4PenelopeGammaConversion" << G4endl; |
---|
344 | G4cout << "Incoming photon energy: " << photonEnergy/keV << " keV" << G4endl; |
---|
345 | G4cout << "-----------------------------------------------------------" << G4endl; |
---|
346 | if (electronKineEnergy) |
---|
347 | G4cout << "Electron (explicitely produced) " << electronKineEnergy/keV << " keV" |
---|
348 | << G4endl; |
---|
349 | if (positronKineEnergy) |
---|
350 | G4cout << "Positron (not at rest) " << positronKineEnergy/keV << " keV" << G4endl; |
---|
351 | G4cout << "Rest masses of e+/- " << 2.0*electron_mass_c2/keV << " keV" << G4endl; |
---|
352 | if (localEnergyDeposit) |
---|
353 | G4cout << "Local energy deposit " << localEnergyDeposit/keV << " keV" << G4endl; |
---|
354 | G4cout << "Total final state: " << (electronKineEnergy+positronKineEnergy+ |
---|
355 | localEnergyDeposit+2.0*electron_mass_c2)/keV << |
---|
356 | " keV" << G4endl; |
---|
357 | G4cout << "-----------------------------------------------------------" << G4endl; |
---|
358 | } |
---|
359 | if (verboseLevel > 0) |
---|
360 | { |
---|
361 | G4double energyDiff = std::fabs(electronKineEnergy+positronKineEnergy+ |
---|
362 | localEnergyDeposit+2.0*electron_mass_c2-photonEnergy); |
---|
363 | if (energyDiff > 0.05*keV) |
---|
364 | G4cout << "Warning from G4PenelopeGammaConversion: problem with energy conservation: " |
---|
365 | << (electronKineEnergy+positronKineEnergy+ |
---|
366 | localEnergyDeposit+2.0*electron_mass_c2)/keV |
---|
367 | << " keV (final) vs. " << photonEnergy/keV << " keV (initial)" << G4endl; |
---|
368 | } |
---|
369 | } |
---|
370 | |
---|
371 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
372 | |
---|
373 | std::vector<G4double> G4PenelopeGammaConversionModel::ScreenFunction(G4double b) |
---|
374 | { |
---|
375 | std::vector<G4double> result; |
---|
376 | result.clear(); |
---|
377 | G4double bsquare=b*b; |
---|
378 | G4double a0,f1,f2; |
---|
379 | f1=2.0-2*std::log(1+bsquare); |
---|
380 | f2=f1-(2.0/3.0); |
---|
381 | if (b < 1.0e-10) |
---|
382 | { |
---|
383 | f1=f1-twopi*b; |
---|
384 | } |
---|
385 | else |
---|
386 | { |
---|
387 | a0 = 4*b*std::atan(1.0/b); |
---|
388 | f1 = f1 - a0; |
---|
389 | f2 = f2+2*bsquare*(4.0-a0-3*std::log((1+bsquare)/bsquare)); |
---|
390 | } |
---|
391 | result.push_back(0.5*(3*f1-f2)); |
---|
392 | result.push_back(0.25*(3*f1+f2)); |
---|
393 | return result; |
---|
394 | } |
---|
395 | |
---|
396 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
397 | |
---|
398 | G4double G4PenelopeGammaConversionModel::GetScreeningRadius(G4double Z) |
---|
399 | { |
---|
400 | G4double result = 0; |
---|
401 | G4bool foundElement = false; |
---|
402 | G4int iZ = (G4int) Z; |
---|
403 | if (!fTheScreeningRadii) |
---|
404 | fTheScreeningRadii = new std::map<G4int,G4double>; |
---|
405 | |
---|
406 | if (fTheScreeningRadii->count(iZ)) |
---|
407 | { |
---|
408 | //The element is already loaded: just return it |
---|
409 | result = fTheScreeningRadii->find(iZ)->second; |
---|
410 | return result; |
---|
411 | } |
---|
412 | else //retrieve all from file |
---|
413 | { |
---|
414 | char* path = getenv("G4LEDATA"); |
---|
415 | if (!path) |
---|
416 | { |
---|
417 | G4String excep = "G4PenelopeGammaConversionModel - G4LEDATA environment variable not set!"; |
---|
418 | G4Exception(excep); |
---|
419 | } |
---|
420 | G4String pathString(path); |
---|
421 | G4String pathFile = pathString + "/penelope/pp-pen.dat"; |
---|
422 | std::ifstream file(pathFile); |
---|
423 | |
---|
424 | if (!(file.is_open())) |
---|
425 | { |
---|
426 | G4String excep = "G4PenelopeGammaConversionModel - data file " + pathFile + "not found!"; |
---|
427 | G4Exception(excep); |
---|
428 | } |
---|
429 | G4int k; |
---|
430 | G4double a1,a2; |
---|
431 | while(!file.eof()) { |
---|
432 | file >> k >> a1 >> a2; |
---|
433 | fTheScreeningRadii->insert(std::make_pair(k,a1)); |
---|
434 | if ((G4double) k == Z) |
---|
435 | { |
---|
436 | result = a1; |
---|
437 | foundElement = true; |
---|
438 | } |
---|
439 | } |
---|
440 | file.close(); |
---|
441 | if (verboseLevel > 2) |
---|
442 | G4cout << "Read file pp-pen.dat" << G4endl; |
---|
443 | if (foundElement) |
---|
444 | return result; |
---|
445 | else |
---|
446 | { |
---|
447 | G4String excep = "G4PenelopeGammaConversionModel - Screening Radius for not found in the data file"; |
---|
448 | G4Exception(excep); |
---|
449 | return 0; |
---|
450 | } |
---|
451 | } |
---|
452 | } |
---|
453 | |
---|
454 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
455 | |
---|
456 | G4double G4PenelopeGammaConversionModel::CoulombCorrection(G4double a) |
---|
457 | { |
---|
458 | G4double fc=0; |
---|
459 | G4double b[7] = {0.202059,-0.03693,0.00835,-0.00201,0.00049,-0.00012,0.00003}; |
---|
460 | G4double aSquared = a*a; |
---|
461 | G4double aFourth = aSquared*aSquared; |
---|
462 | G4double aEighth = aFourth*aFourth; |
---|
463 | |
---|
464 | fc = ((1.0/(1.0+a*a))+b[0]+b[1]*aSquared+b[2]*aFourth+b[3]*(aSquared*aFourth)+ |
---|
465 | b[4]*aEighth+b[5]*(aEighth*aSquared)+b[6]*(aEighth*aFourth)); |
---|
466 | fc=aSquared*fc; |
---|
467 | return fc; |
---|
468 | } |
---|
469 | |
---|
470 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... |
---|
471 | |
---|
472 | G4double G4PenelopeGammaConversionModel::LowEnergyCorrection(G4double a,G4double eki) |
---|
473 | { |
---|
474 | G4double f0=0,t=0; |
---|
475 | G4double b[12] = {-1.744,-12.10,11.18,8.523,73.26,-41.41,-13.52,-121.1,94.41,8.946,62.05,-63.41}; |
---|
476 | t=std::sqrt(2.0*eki); |
---|
477 | G4double tSq = t*t; |
---|
478 | f0=(b[0]+b[1]*a+b[2]*a*a)*t+(b[3]+b[4]*a+b[5]*a*a)*(tSq)+(b[6]+b[7]*a+b[8]*a*a)*(tSq*t)+ |
---|
479 | (b[9]+b[10]*a+b[11]*a*a)*(tSq*tSq); |
---|
480 | return f0; |
---|
481 | |
---|
482 | } |
---|