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26 // 26 //
27 // Geant4 Header : G4HadronElastic 27 // Geant4 Header : G4HadronElastic
28 // 28 //
29 // Author : V.Ivanchenko 29 June 2009 (redesig 29 // Author : V.Ivanchenko 29 June 2009 (redesign old elastic model)
30 // 30 //
31 31
32 #include "G4HadronElastic.hh" 32 #include "G4HadronElastic.hh"
33 #include "G4SystemOfUnits.hh" 33 #include "G4SystemOfUnits.hh"
34 #include "G4ParticleTable.hh" 34 #include "G4ParticleTable.hh"
35 #include "G4ParticleDefinition.hh" 35 #include "G4ParticleDefinition.hh"
36 #include "G4IonTable.hh" 36 #include "G4IonTable.hh"
37 #include "Randomize.hh" 37 #include "Randomize.hh"
38 #include "G4Proton.hh" 38 #include "G4Proton.hh"
39 #include "G4Neutron.hh" 39 #include "G4Neutron.hh"
40 #include "G4Deuteron.hh" 40 #include "G4Deuteron.hh"
41 #include "G4Alpha.hh" 41 #include "G4Alpha.hh"
42 #include "G4Pow.hh" 42 #include "G4Pow.hh"
43 #include "G4Exp.hh" 43 #include "G4Exp.hh"
44 #include "G4Log.hh" 44 #include "G4Log.hh"
45 #include "G4HadronicParameters.hh" 45 #include "G4HadronicParameters.hh"
46 #include "G4PhysicsModelCatalog.hh" <<
47 46
48 47
49 G4HadronElastic::G4HadronElastic(const G4Strin 48 G4HadronElastic::G4HadronElastic(const G4String& name)
50 : G4HadronicInteraction(name), secID(-1) << 49 : G4HadronicInteraction(name)
51 { 50 {
52 SetMinEnergy( 0.0*GeV ); 51 SetMinEnergy( 0.0*GeV );
53 SetMaxEnergy( G4HadronicParameters::Instance 52 SetMaxEnergy( G4HadronicParameters::Instance()->GetMaxEnergy() );
54 lowestEnergyLimit= 1.e-6*eV; << 53 lowestEnergyLimit= 1.e-6*eV;
55 pLocalTmax = 0.0; <<
56 nwarn = 0; <<
57 54
58 theProton = G4Proton::Proton(); 55 theProton = G4Proton::Proton();
59 theNeutron = G4Neutron::Neutron(); 56 theNeutron = G4Neutron::Neutron();
60 theDeuteron = G4Deuteron::Deuteron(); 57 theDeuteron = G4Deuteron::Deuteron();
61 theAlpha = G4Alpha::Alpha(); 58 theAlpha = G4Alpha::Alpha();
62 <<
63 secID = G4PhysicsModelCatalog::GetModelID( " <<
64 } 59 }
65 60
66 G4HadronElastic::~G4HadronElastic() 61 G4HadronElastic::~G4HadronElastic()
67 {} 62 {}
68 63
69 64
70 void G4HadronElastic::ModelDescription(std::os 65 void G4HadronElastic::ModelDescription(std::ostream& outFile) const
71 { 66 {
72 outFile << "G4HadronElastic is the base clas << 67
73 << "elastic scattering models except << 68 outFile << "G4HadronElastic is a hadron-nucleus elastic scattering\n"
74 << "By default it uses the Gheisha t << 69 << "model which uses the Gheisha two-exponential momentum\n"
75 << "transfer parameterization. The model << 70 << "transfer parameterization. The model is fully relativistic\n"
76 << "as opposed to the original Gheisha mod << 71 << "as opposed to the original Gheisha model which was not.\n"
77 << "This model may be used for all long-li << 72 << "This model may be used for all long-lived hadrons at all\n"
78 << "incident energies but fit the data onl << 73 << "incident energies.\n";
>> 74
79 } 75 }
80 76
81 G4HadFinalState* G4HadronElastic::ApplyYoursel 77 G4HadFinalState* G4HadronElastic::ApplyYourself(
82 const G4HadProjectile& aTrack, G4Nucleus& 78 const G4HadProjectile& aTrack, G4Nucleus& targetNucleus)
83 { 79 {
84 theParticleChange.Clear(); 80 theParticleChange.Clear();
85 81
86 const G4HadProjectile* aParticle = &aTrack; 82 const G4HadProjectile* aParticle = &aTrack;
87 G4double ekin = aParticle->GetKineticEnergy( 83 G4double ekin = aParticle->GetKineticEnergy();
88 <<
89 // no scattering below the limit <<
90 if(ekin <= lowestEnergyLimit) { 84 if(ekin <= lowestEnergyLimit) {
91 theParticleChange.SetEnergyChange(ekin); 85 theParticleChange.SetEnergyChange(ekin);
92 theParticleChange.SetMomentumChange(0.,0., << 86 theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit());
93 return &theParticleChange; 87 return &theParticleChange;
94 } 88 }
95 89
96 G4int A = targetNucleus.GetA_asInt(); 90 G4int A = targetNucleus.GetA_asInt();
97 G4int Z = targetNucleus.GetZ_asInt(); 91 G4int Z = targetNucleus.GetZ_asInt();
98 92
>> 93 G4double plab = aParticle->GetTotalMomentum();
>> 94
99 // Scattered particle referred to axis of in 95 // Scattered particle referred to axis of incident particle
100 const G4ParticleDefinition* theParticle = aP 96 const G4ParticleDefinition* theParticle = aParticle->GetDefinition();
101 G4double m1 = theParticle->GetPDGMass(); 97 G4double m1 = theParticle->GetPDGMass();
102 G4double plab = std::sqrt(ekin*(ekin + 2.0*m <<
103 98
104 if (verboseLevel>1) { 99 if (verboseLevel>1) {
105 G4cout << "G4HadronElastic: " 100 G4cout << "G4HadronElastic: "
106 << aParticle->GetDefinition()->GetParticl 101 << aParticle->GetDefinition()->GetParticleName()
107 << " Plab(GeV/c)= " << plab/GeV 102 << " Plab(GeV/c)= " << plab/GeV
108 << " Ekin(MeV) = " << ekin/MeV 103 << " Ekin(MeV) = " << ekin/MeV
109 << " scattered off Z= " << Z 104 << " scattered off Z= " << Z
110 << " A= " << A 105 << " A= " << A
111 << G4endl; 106 << G4endl;
112 } 107 }
113 108
114 G4double mass2 = G4NucleiProperties::GetNucl 109 G4double mass2 = G4NucleiProperties::GetNuclearMass(A, Z);
115 G4double e1 = m1 + ekin; << 110 G4LorentzVector lv1 = aParticle->Get4Momentum();
116 G4LorentzVector lv(0.0,0.0,plab,e1+mass2); << 111 G4LorentzVector lv(0.0,0.0,0.0,mass2);
>> 112 lv += lv1;
>> 113
117 G4ThreeVector bst = lv.boostVector(); 114 G4ThreeVector bst = lv.boostVector();
118 G4double momentumCMS = plab*mass2/std::sqrt( << 115 lv1.boost(-bst);
119 116
120 pLocalTmax = 4.0*momentumCMS*momentumCMS; << 117 G4ThreeVector p1 = lv1.vect();
>> 118 G4double momentumCMS = p1.mag();
>> 119 G4double tmax = 4.0*momentumCMS*momentumCMS;
121 120
122 // Sampling in CM system 121 // Sampling in CM system
123 G4double t = SampleInvariantT(theParticle, p << 122 G4double t = SampleInvariantT(theParticle, plab, Z, A);
124 <<
125 if(t < 0.0 || t > pLocalTmax) { <<
126 // For the very rare cases where cos(theta <<
127 // print some debugging information via a <<
128 // using the default algorithm <<
129 #ifdef G4VERBOSE <<
130 if(nwarn < 2) { <<
131 G4ExceptionDescription ed; <<
132 ed << GetModelName() << " wrong sampling <<
133 << " for " << aParticle->GetDefinition()->G <<
134 << " ekin=" << ekin << " MeV" <<
135 << " off (Z,A)=(" << Z << "," << A << ") - <<
136 G4Exception( "G4HadronElastic::ApplyYour <<
137 ++nwarn; <<
138 } <<
139 #endif <<
140 t = G4HadronElastic::SampleInvariantT(theP <<
141 } <<
142 <<
143 G4double phi = G4UniformRand()*CLHEP::twopi 123 G4double phi = G4UniformRand()*CLHEP::twopi;
144 G4double cost = 1. - 2.0*t/pLocalTmax; << 124 G4double cost = 1. - 2.0*t/tmax;
145 << 125 if(cost > 1.0) { cost = 1.0; }
146 if (cost > 1.0) { cost = 1.0; } << 126 else if(cost < -1.0) { cost = -1.0; }
147 else if(cost < -1.0) { cost = -1.0; } <<
148 <<
149 G4double sint = std::sqrt((1.0-cost)*(1.0+co 127 G4double sint = std::sqrt((1.0-cost)*(1.0+cost));
150 128
151 if (verboseLevel>1) { 129 if (verboseLevel>1) {
152 G4cout << " t= " << t << " tmax(GeV^2)= " << 130 G4cout << " t= " << t << " tmax(GeV^2)= " << tmax/(GeV*GeV)
153 << " Pcms(GeV)= " << momentumCMS/GeV << " 131 << " Pcms(GeV)= " << momentumCMS/GeV << " cos(t)=" << cost
154 << " sin(t)=" << sint << G4endl; 132 << " sin(t)=" << sint << G4endl;
155 } 133 }
156 G4LorentzVector nlv1(momentumCMS*sint*std::c << 134 G4ThreeVector v1(sint*std::cos(phi),sint*std::sin(phi),cost);
157 momentumCMS*sint*std::sin(phi), << 135 v1 *= momentumCMS;
158 momentumCMS*cost, << 136 G4LorentzVector nlv1(v1.x(),v1.y(),v1.z(),
159 std::sqrt(momentumCMS*momentumCMS + 137 std::sqrt(momentumCMS*momentumCMS + m1*m1));
160 138
161 nlv1.boost(bst); 139 nlv1.boost(bst);
162 140
163 G4double eFinal = nlv1.e() - m1; 141 G4double eFinal = nlv1.e() - m1;
164 if (verboseLevel > 1) { 142 if (verboseLevel > 1) {
165 G4cout <<"G4HadronElastic: m= " << m1 << " 143 G4cout <<"G4HadronElastic: m= " << m1 << " Efin(MeV)= " << eFinal
166 << " 4-M Final: " << nlv1 << 144 << " Proj: 4-mom " << lv1 << " Final: " << nlv1
167 << G4endl; 145 << G4endl;
168 } 146 }
169 147
170 if(eFinal <= 0.0) { << 148 // precision lost in kinematics, only energy is changed
171 theParticleChange.SetMomentumChange(0.0,0. << 149 if (eFinal <= 0.0) {
172 theParticleChange.SetEnergyChange(0.0); << 150 G4double mom = nlv1.mag();
>> 151 if(mom == 0.0) {
>> 152 nlv1.set(0.0,0.0,0.0,m1);
>> 153 theParticleChange.SetEnergyChange(0.0);
>> 154 } else {
>> 155 eFinal = mom*mom/(std::sqrt(m1*m1 + mom*mom) + m1);
>> 156 theParticleChange.SetEnergyChange(eFinal);
>> 157 theParticleChange.SetMomentumChange(nlv1.vect().unit());
>> 158 }
173 } else { 159 } else {
174 theParticleChange.SetMomentumChange(nlv1.v 160 theParticleChange.SetMomentumChange(nlv1.vect().unit());
175 theParticleChange.SetEnergyChange(eFinal); 161 theParticleChange.SetEnergyChange(eFinal);
176 } 162 }
177 lv -= nlv1; 163 lv -= nlv1;
178 G4double erec = std::max(lv.e() - mass2, 0. << 164 G4double erec = lv.e() - mass2;
179 if (verboseLevel > 1) { 165 if (verboseLevel > 1) {
180 G4cout << "Recoil: " <<" m= " << mass2 << 166 G4cout << "Recoil: " <<" m= " << mass2 << " Erec(MeV)= " << erec
181 << " 4-mom: " << lv 167 << " 4-mom: " << lv
182 << G4endl; 168 << G4endl;
183 } 169 }
184 170
185 // the recoil is created if kinetic energy a <<
186 if(erec > GetRecoilEnergyThreshold()) { 171 if(erec > GetRecoilEnergyThreshold()) {
187 G4ParticleDefinition * theDef = nullptr; 172 G4ParticleDefinition * theDef = nullptr;
188 if(Z == 1 && A == 1) { theDef = theP 173 if(Z == 1 && A == 1) { theDef = theProton; }
189 else if (Z == 1 && A == 2) { theDef = theD 174 else if (Z == 1 && A == 2) { theDef = theDeuteron; }
190 else if (Z == 1 && A == 3) { theDef = G4Tr 175 else if (Z == 1 && A == 3) { theDef = G4Triton::Triton(); }
191 else if (Z == 2 && A == 3) { theDef = G4He 176 else if (Z == 2 && A == 3) { theDef = G4He3::He3(); }
192 else if (Z == 2 && A == 4) { theDef = theA 177 else if (Z == 2 && A == 4) { theDef = theAlpha; }
193 else { 178 else {
194 theDef = 179 theDef =
195 G4ParticleTable::GetParticleTable()->GetIonT 180 G4ParticleTable::GetParticleTable()->GetIonTable()->GetIon(Z,A,0.0);
196 } 181 }
197 G4DynamicParticle * aSec = new G4DynamicPa << 182 G4DynamicParticle * aSec = new G4DynamicParticle(theDef, lv);
198 theParticleChange.AddSecondary(aSec, secID << 183 theParticleChange.AddSecondary(aSec);
199 } else { << 184 } else if(erec > 0.0) {
200 theParticleChange.SetLocalEnergyDeposit(er 185 theParticleChange.SetLocalEnergyDeposit(erec);
201 } 186 }
202 187
203 return &theParticleChange; 188 return &theParticleChange;
204 } 189 }
205 190
206 // sample momentum transfer in the CMS system 191 // sample momentum transfer in the CMS system
207 G4double 192 G4double
208 G4HadronElastic::SampleInvariantT(const G4Part << 193 G4HadronElastic::SampleInvariantT(const G4ParticleDefinition* p,
209 G4double mom, G4int, G4int A) << 194 G4double plab,
>> 195 G4int Z, G4int A)
210 { 196 {
211 const G4double plabLowLimit = 400.0*CLHEP::M << 197 static const G4double GeV2 = GeV*GeV;
212 const G4double GeV2 = GeV*GeV; << 198 G4double momentumCMS = ComputeMomentumCMS(p,plab,Z,A);
213 const G4double z07in13 = std::pow(0.7, 0.333 << 199 G4double tmax = 4.0*momentumCMS*momentumCMS/GeV2;
214 const G4double numLimit = 18.; << 200 G4double aa, bb, cc;
215 << 201 G4double dd = 10.;
216 G4int pdg = std::abs(part->GetPDGEncoding()) <<
217 G4double tmax = pLocalTmax/GeV2; <<
218 <<
219 G4double aa, bb, cc, dd; <<
220 G4Pow* g4pow = G4Pow::GetInstance(); 202 G4Pow* g4pow = G4Pow::GetInstance();
221 if (A <= 62) { 203 if (A <= 62) {
222 if (pdg == 211){ //Pions << 204 bb = 14.5*g4pow->Z23(A);
223 if(mom >= plabLowLimit){ //High ener << 205 aa = g4pow->powZ(A, 1.63)/bb;
224 bb = 14.5*g4pow->Z23(A);/*14.5*/ << 206 cc = 1.4*g4pow->Z13(A)/dd;
225 dd = 10.; << 207 } else {
226 cc = 0.075*g4pow->Z13(A)/dd;//1.4 << 208 bb = 60.*g4pow->Z13(A);
227 //aa = g4pow->powZ(A, 1.93)/bb;//1.63 << 209 aa = g4pow->powZ(A, 1.33)/bb;
228 aa = (A*A)/bb;//1.63 << 210 cc = 0.4*g4pow->powZ(A, 0.4)/dd;
229 } else { //Low ene <<
230 bb = 29.*z07in13*z07in13*g4pow->Z23(A); <<
231 dd = 15.; <<
232 cc = 0.04*g4pow->Z13(A)/dd;//1.4 <<
233 aa = g4pow->powZ(A, 1.63)/bb;//1.63 <<
234 } <<
235 } else { //Other particles <<
236 bb = 14.5*g4pow->Z23(A); <<
237 dd = 20.; <<
238 aa = (A*A)/bb;//1.63 <<
239 cc = 1.4*g4pow->Z13(A)/dd; <<
240 } <<
241 //=========================== <<
242 } else { //(A>62) <<
243 if (pdg == 211) { <<
244 if(mom >= plabLowLimit){ //high <<
245 bb = 60.*z07in13*g4pow->Z13(A);//60 <<
246 dd = 30.; <<
247 aa = 0.5*(A*A)/bb;//1.33 <<
248 cc = 4.*g4pow->powZ(A,0.4)/dd;//1:0.4 -- <<
249 } else { //low <<
250 bb = 120.*z07in13*g4pow->Z13(A);//60 <<
251 dd = 30.; <<
252 aa = 2.*g4pow->powZ(A,1.33)/bb; <<
253 cc = 4.*g4pow->powZ(A,0.4)/dd;//1:0.4 -- <<
254 } <<
255 } else { <<
256 bb = 60.*g4pow->Z13(A); <<
257 dd = 25.; <<
258 aa = g4pow->powZ(A,1.33)/bb;//1.33 <<
259 cc = 0.2*g4pow->powZ(A,0.4)/dd;//1:0.4 <<
260 } <<
261 } 211 }
262 G4double q1 = 1.0 - G4Exp(-std::min(bb*tmax, << 212 G4double q1 = 1.0 - G4Exp(-bb*tmax);
263 G4double q2 = 1.0 - G4Exp(-std::min(dd*tmax, << 213 G4double q2 = 1.0 - G4Exp(-dd*tmax);
264 G4double s1 = q1*aa; 214 G4double s1 = q1*aa;
265 G4double s2 = q2*cc; 215 G4double s2 = q2*cc;
266 if((s1 + s2)*G4UniformRand() < s2) { 216 if((s1 + s2)*G4UniformRand() < s2) {
267 q1 = q2; 217 q1 = q2;
268 bb = dd; 218 bb = dd;
269 } 219 }
270 return -GeV2*G4Log(1.0 - G4UniformRand()*q1) 220 return -GeV2*G4Log(1.0 - G4UniformRand()*q1)/bb;
271 } 221 }
272 <<
273 ////////////////////////////////////////////// <<
274 // <<
275 // Cofs for s-,c-,b-particles ds/dt slopes <<
276 <<
277 G4double G4HadronElastic::GetSlopeCof(const G4 <<
278 { <<
279 // The input parameter "pdg" should be the a <<
280 // (i.e. the same value for a particle and i <<
281 <<
282 G4double coeff = 1.0; <<
283 <<
284 // heavy barions <<
285 <<
286 static const G4double lBarCof1S = 0.88; <<
287 static const G4double lBarCof2S = 0.76; <<
288 static const G4double lBarCof3S = 0.64; <<
289 static const G4double lBarCof1C = 0.784378 <<
290 static const G4double lBarCofSC = 0.664378 <<
291 static const G4double lBarCof2SC = 0.544378 <<
292 static const G4double lBarCof1B = 0.740659 <<
293 static const G4double lBarCofSB = 0.620659 <<
294 static const G4double lBarCof2SB = 0.500659 <<
295 <<
296 if( pdg == 3122 || pdg == 3222 || pdg == 31 <<
297 { <<
298 coeff = lBarCof1S; // Lambda, Sigma+, Sigm <<
299 <<
300 } else if( pdg == 3322 || pdg == 3312 ) <<
301 { <<
302 coeff = lBarCof2S; // Xi-, Xi0 <<
303 } <<
304 else if( pdg == 3324) <<
305 { <<
306 coeff = lBarCof3S; // Omega <<
307 } <<
308 else if( pdg == 4122 || pdg == 4212 || pd <<
309 { <<
310 coeff = lBarCof1C; // LambdaC+, SigmaC+, S <<
311 } <<
312 else if( pdg == 4332 ) <<
313 { <<
314 coeff = lBarCof2SC; // OmegaC <<
315 } <<
316 else if( pdg == 4232 || pdg == 4132 ) <<
317 { <<
318 coeff = lBarCofSC; // XiC+, XiC0 <<
319 } <<
320 else if( pdg == 5122 || pdg == 5222 || pdg = <<
321 { <<
322 coeff = lBarCof1B; // LambdaB, SigmaB+, Si <<
323 } <<
324 else if( pdg == 5332 ) <<
325 { <<
326 coeff = lBarCof2SB; // OmegaB- <<
327 } <<
328 else if( pdg == 5132 || pdg == 5232 ) // XiB <<
329 { <<
330 coeff = lBarCofSB; <<
331 } <<
332 // heavy mesons Kaons? <<
333 static const G4double lMesCof1S = 0.82; // K <<
334 static const G4double llMesCof1C = 0.676568; <<
335 static const G4double llMesCof1B = 0.610989; <<
336 static const G4double llMesCof2C = 0.353135; <<
337 static const G4double llMesCof2B = 0.221978; <<
338 static const G4double llMesCofSC = 0.496568; <<
339 static const G4double llMesCofSB = 0.430989; <<
340 static const G4double llMesCofCB = 0.287557; <<
341 static const G4double llMesCofEtaP = 0.88; <<
342 static const G4double llMesCofEta = 0.76; <<
343 <<
344 if( pdg == 321 || pdg == 311 || pdg == 310 ) <<
345 { <<
346 coeff = lMesCof1S; //K+-0 <<
347 } <<
348 else if( pdg == 511 || pdg == 521 ) <<
349 { <<
350 coeff = llMesCof1B; // BMeson0, BMeson+ <<
351 } <<
352 else if(pdg == 421 || pdg == 411 ) <<
353 { <<
354 coeff = llMesCof1C; // DMeson+, DMeson0 <<
355 } <<
356 else if( pdg == 531 ) <<
357 { <<
358 coeff = llMesCofSB; // BSMeson0 <<
359 } <<
360 else if( pdg == 541 ) <<
361 { <<
362 coeff = llMesCofCB; // BCMeson+- <<
363 } <<
364 else if(pdg == 431 ) <<
365 { <<
366 coeff = llMesCofSC; // DSMeson+- <<
367 } <<
368 else if(pdg == 441 || pdg == 443 ) <<
369 { <<
370 coeff = llMesCof2C; // Etac, JPsi <<
371 } <<
372 else if(pdg == 553 ) <<
373 { <<
374 coeff = llMesCof2B; // Upsilon <<
375 } <<
376 else if(pdg == 221 ) <<
377 { <<
378 coeff = llMesCofEta; // Eta <<
379 } <<
380 else if(pdg == 331 ) <<
381 { <<
382 coeff = llMesCofEtaP; // Eta' <<
383 } <<
384 return coeff; <<
385 } <<
386 <<
387 222
388 223