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25 // 25 //
>> 26 // $Id: G4HadronElastic.cc,v 1.39 2006/11/23 14:51:30 vnivanch Exp $
>> 27 // GEANT4 tag $Name: geant4-08-02-patch-01 $
26 // 28 //
27 // Geant4 Header : G4HadronElastic <<
28 // 29 //
29 // Author : V.Ivanchenko 29 June 2009 (redesig << 30 // Physics model class G4HadronElastic (derived from G4LElastic)
30 // << 31 //
>> 32 //
>> 33 // G4 Model: Low-energy Elastic scattering with 4-momentum balance
>> 34 // F.W. Jones, TRIUMF, 04-JUN-96
>> 35 // Uses G4ElasticHadrNucleusHE and G4VQCrossSection
>> 36 //
>> 37 //
>> 38 // 25-JUN-98 FWJ: replaced missing Initialize for ParticleChange.
>> 39 // 09-Set-05 V.Ivanchenko HARP version of the model: fix scattering
>> 40 // on hydrogen, use relativistic Lorentz transformation
>> 41 // 24-Nov-05 V.Ivanchenko sample cost in center of mass reference system
>> 42 // 03-Dec-05 V.Ivanchenko add protection to initial momentum 20 MeV/c in
>> 43 // center of mass system (before it was in lab system)
>> 44 // below model is not valid
>> 45 // 14-Dec-05 V.Ivanchenko change protection to cos(theta) < -1 and
>> 46 // rename the class
>> 47 // 13-Apr-06 V.Ivanchenko move to coherent_elastic subdirectory; remove
>> 48 // charge exchange; remove limitation on incident momentum;
>> 49 // add s-wave regim below some momentum
>> 50 // 24-Apr-06 V.Ivanchenko add neutron scattering on hydrogen from CHIPS
>> 51 // 07-Jun-06 V.Ivanchenko fix problem of rotation
>> 52 // 25-Jul-06 V.Ivanchenko add 19 MeV low energy, below which S-wave is sampled
>> 53 // 02-Aug-06 V.Ivanchenko introduce energy cut on the aria of S-wave for pions
>> 54 // 24-Aug-06 V.Ivanchenko switch on G4ElasticHadrNucleusHE
>> 55 // 31-Aug-06 V.Ivanchenko do not sample sacttering for particles with kinetic
>> 56 // energy below 10 keV
>> 57 // 16-Nov-06 V.Ivanchenko Simplify logic of choosing of the model for sampling
>> 58 //
31 59
32 #include "G4HadronElastic.hh" 60 #include "G4HadronElastic.hh"
33 #include "G4SystemOfUnits.hh" <<
34 #include "G4ParticleTable.hh" 61 #include "G4ParticleTable.hh"
35 #include "G4ParticleDefinition.hh" 62 #include "G4ParticleDefinition.hh"
36 #include "G4IonTable.hh" 63 #include "G4IonTable.hh"
>> 64 #include "G4QElasticCrossSection.hh"
>> 65 #include "G4VQCrossSection.hh"
>> 66 #include "G4ElasticHadrNucleusHE.hh"
37 #include "Randomize.hh" 67 #include "Randomize.hh"
38 #include "G4Proton.hh" 68 #include "G4Proton.hh"
39 #include "G4Neutron.hh" 69 #include "G4Neutron.hh"
40 #include "G4Deuteron.hh" 70 #include "G4Deuteron.hh"
41 #include "G4Alpha.hh" 71 #include "G4Alpha.hh"
42 #include "G4Pow.hh" << 72 #include "G4PionPlus.hh"
43 #include "G4Exp.hh" << 73 #include "G4PionMinus.hh"
44 #include "G4Log.hh" <<
45 #include "G4HadronicParameters.hh" <<
46 #include "G4PhysicsModelCatalog.hh" <<
47 <<
48 74
49 G4HadronElastic::G4HadronElastic(const G4Strin << 75 G4HadronElastic::G4HadronElastic(G4double, G4double, G4double)
50 : G4HadronicInteraction(name), secID(-1) << 76 : G4HadronicInteraction()
51 { 77 {
52 SetMinEnergy( 0.0*GeV ); 78 SetMinEnergy( 0.0*GeV );
53 SetMaxEnergy( G4HadronicParameters::Instance << 79 SetMaxEnergy( 100.*TeV );
54 lowestEnergyLimit= 1.e-6*eV; << 80 verboseLevel= 0;
55 pLocalTmax = 0.0; << 81 lowEnergyRecoilLimit = 100.*keV;
56 nwarn = 0; << 82 lowEnergyLimitQ = 19.0*MeV;
>> 83 lowEnergyLimitHE = 0.4*GeV;
>> 84 lowEnergyLimitHE = DBL_MAX;
>> 85 lowestEnergyLimit= 10.0*keV;
>> 86 plabLowLimit = 20.0*MeV;
>> 87
>> 88 qCManager = G4QElasticCrossSection::GetPointer();
>> 89 hElastic = new G4ElasticHadrNucleusHE();
57 90
58 theProton = G4Proton::Proton(); 91 theProton = G4Proton::Proton();
59 theNeutron = G4Neutron::Neutron(); 92 theNeutron = G4Neutron::Neutron();
60 theDeuteron = G4Deuteron::Deuteron(); 93 theDeuteron = G4Deuteron::Deuteron();
61 theAlpha = G4Alpha::Alpha(); 94 theAlpha = G4Alpha::Alpha();
62 << 95 thePionPlus = G4PionPlus::PionPlus();
63 secID = G4PhysicsModelCatalog::GetModelID( " << 96 thePionMinus= G4PionMinus::PionMinus();
64 } 97 }
65 98
66 G4HadronElastic::~G4HadronElastic() 99 G4HadronElastic::~G4HadronElastic()
67 {} << 100 {
>> 101 delete hElastic;
>> 102 }
68 103
>> 104 G4VQCrossSection* G4HadronElastic::GetCS()
>> 105 {
>> 106 return qCManager;
>> 107 }
69 108
70 void G4HadronElastic::ModelDescription(std::os << 109 G4ElasticHadrNucleusHE* G4HadronElastic::GetHElastic()
71 { 110 {
72 outFile << "G4HadronElastic is the base clas << 111 return hElastic;
73 << "elastic scattering models except <<
74 << "By default it uses the Gheisha t <<
75 << "transfer parameterization. The model <<
76 << "as opposed to the original Gheisha mod <<
77 << "This model may be used for all long-li <<
78 << "incident energies but fit the data onl <<
79 } 112 }
80 113
81 G4HadFinalState* G4HadronElastic::ApplyYoursel 114 G4HadFinalState* G4HadronElastic::ApplyYourself(
82 const G4HadProjectile& aTrack, G4Nucleus& 115 const G4HadProjectile& aTrack, G4Nucleus& targetNucleus)
83 { 116 {
84 theParticleChange.Clear(); 117 theParticleChange.Clear();
85 118
86 const G4HadProjectile* aParticle = &aTrack; 119 const G4HadProjectile* aParticle = &aTrack;
87 G4double ekin = aParticle->GetKineticEnergy( 120 G4double ekin = aParticle->GetKineticEnergy();
88 <<
89 // no scattering below the limit <<
90 if(ekin <= lowestEnergyLimit) { 121 if(ekin <= lowestEnergyLimit) {
91 theParticleChange.SetEnergyChange(ekin); 122 theParticleChange.SetEnergyChange(ekin);
92 theParticleChange.SetMomentumChange(0.,0., << 123 theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit());
93 return &theParticleChange; 124 return &theParticleChange;
94 } 125 }
95 126
96 G4int A = targetNucleus.GetA_asInt(); << 127 G4double aTarget = targetNucleus.GetN();
97 G4int Z = targetNucleus.GetZ_asInt(); << 128 G4double zTarget = targetNucleus.GetZ();
>> 129
>> 130 G4double plab = aParticle->GetTotalMomentum();
>> 131 if (verboseLevel >1)
>> 132 G4cout << "G4HadronElastic::DoIt: Incident particle plab="
>> 133 << plab/GeV << " GeV/c "
>> 134 << " ekin(MeV) = " << ekin/MeV << " "
>> 135 << aParticle->GetDefinition()->GetParticleName() << G4endl;
98 136
99 // Scattered particle referred to axis of in 137 // Scattered particle referred to axis of incident particle
100 const G4ParticleDefinition* theParticle = aP 138 const G4ParticleDefinition* theParticle = aParticle->GetDefinition();
101 G4double m1 = theParticle->GetPDGMass(); 139 G4double m1 = theParticle->GetPDGMass();
102 G4double plab = std::sqrt(ekin*(ekin + 2.0*m <<
103 140
104 if (verboseLevel>1) { << 141 G4int Z = static_cast<G4int>(zTarget);
105 G4cout << "G4HadronElastic: " << 142 G4int A = static_cast<G4int>(aTarget);
106 << aParticle->GetDefinition()->GetParticl << 143 G4int N = A - Z;
107 << " Plab(GeV/c)= " << plab/GeV << 144 G4int projPDG = theParticle->GetPDGEncoding();
108 << " Ekin(MeV) = " << ekin/MeV << 145 if (verboseLevel>1)
109 << " scattered off Z= " << Z << 146 G4cout << "G4HadronElastic for " << theParticle->GetParticleName()
110 << " A= " << A << 147 << " PDGcode= " << projPDG << " on nucleus Z= " << Z
>> 148 << " A= " << A << " N= " << N
111 << G4endl; 149 << G4endl;
112 } <<
113 150
114 G4double mass2 = G4NucleiProperties::GetNucl << 151 G4ParticleDefinition * theDef = 0;
115 G4double e1 = m1 + ekin; <<
116 G4LorentzVector lv(0.0,0.0,plab,e1+mass2); <<
117 G4ThreeVector bst = lv.boostVector(); <<
118 G4double momentumCMS = plab*mass2/std::sqrt( <<
119 152
120 pLocalTmax = 4.0*momentumCMS*momentumCMS; << 153 if(Z == 1 && A == 1) theDef = theProton;
>> 154 else if (Z == 1 && A == 2) theDef = theDeuteron;
>> 155 else if (Z == 1 && A == 3) theDef = G4Triton::Triton();
>> 156 else if (Z == 2 && A == 3) theDef = G4He3::He3();
>> 157 else if (Z == 2 && A == 4) theDef = theAlpha;
>> 158 else theDef = G4ParticleTable::GetParticleTable()->FindIon(Z,A,0,Z);
>> 159
>> 160 G4double m2 = theDef->GetPDGMass();
>> 161 G4LorentzVector lv1 = aParticle->Get4Momentum();
>> 162 G4LorentzVector lv(0.0,0.0,0.0,m2);
>> 163 lv += lv1;
121 164
122 // Sampling in CM system << 165 G4ThreeVector bst = lv.boostVector();
123 G4double t = SampleInvariantT(theParticle, p << 166 lv1.boost(-bst);
124 167
125 if(t < 0.0 || t > pLocalTmax) { << 168 G4ThreeVector p1 = lv1.vect();
126 // For the very rare cases where cos(theta << 169 G4double ptot = p1.mag();
127 // print some debugging information via a << 170 G4double tmax = 4.0*ptot*ptot;
128 // using the default algorithm << 171 G4double t = 0.0;
129 #ifdef G4VERBOSE << 172
130 if(nwarn < 2) { << 173 // Choose generator
131 G4ExceptionDescription ed; << 174 G4ElasticGenerator gtype = fLElastic;
132 ed << GetModelName() << " wrong sampling << 175
133 << " for " << aParticle->GetDefinition()->G << 176 // Q-elastic for p,n scattering on H and He
134 << " ekin=" << ekin << " MeV" << 177 if ((theParticle == theProton || theParticle == theNeutron)
135 << " off (Z,A)=(" << Z << "," << A << ") - << 178 && Z <= 2 && ekin >= lowEnergyLimitQ)
136 G4Exception( "G4HadronElastic::ApplyYour << 179 gtype = fQElastic;
137 ++nwarn; << 180
>> 181 // HE-elastic for energetic projectiles
>> 182 else if(ekin >= lowEnergyLimitHE && A < 238)
>> 183 gtype = fHElastic;
>> 184 // S-wave for very low energy
>> 185 else if(plab < plabLowLimit) gtype = fSWave;
>> 186
>> 187 //
>> 188 // Sample t
>> 189 //
>> 190 if(gtype == fQElastic) {
>> 191 if (verboseLevel >1)
>> 192 G4cout << "G4HadronElastic: Z= " << Z << " N= "
>> 193 << N << " pdg= " << projPDG
>> 194 << " mom(GeV)= " << plab/GeV << " " << qCManager << G4endl;
>> 195 if(Z == 1 && N == 2) N = 1;
>> 196 else if(Z == 2 && N == 1) N = 2;
>> 197 G4double cs = qCManager->GetCrossSection(false,plab,Z,N,projPDG);
>> 198 if(cs > 0.0) t = qCManager->GetExchangeT(Z,N,projPDG);
>> 199 else gtype = fLElastic;
>> 200 }
>> 201
>> 202 if(gtype == fLElastic) {
>> 203 t = GeV*GeV*SampleT(ptot,m1,m2,aTarget);
>> 204 if(t > tmax) gtype = fSWave;
>> 205 }
>> 206
>> 207 if(gtype == fHElastic) {
>> 208 t = hElastic->SampleT(theParticle,plab,Z,A);
>> 209 if(t > tmax) gtype = fSWave;
>> 210 }
>> 211
>> 212 // NaN finder
>> 213 if(!(t < 0.0 || t >= 0.0)) {
>> 214 if (verboseLevel > 0) {
>> 215 G4cout << "G4HadronElastic:WARNING: Z= " << Z << " N= "
>> 216 << N << " pdg= " << projPDG
>> 217 << " mom(GeV)= " << plab/GeV
>> 218 << " the model type " << gtype;
>> 219 if(gtype == fQElastic) G4cout << " CHIPS ";
>> 220 else if(gtype == fLElastic) G4cout << " LElastic ";
>> 221 else if(gtype == fHElastic) G4cout << " HElastic ";
>> 222 G4cout << " S-wave will be sampled"
>> 223 << G4endl;
138 } 224 }
139 #endif << 225 gtype = fSWave;
140 t = G4HadronElastic::SampleInvariantT(theP <<
141 } 226 }
142 227
143 G4double phi = G4UniformRand()*CLHEP::twopi << 228 if(gtype == fSWave) t = G4UniformRand()*tmax;
144 G4double cost = 1. - 2.0*t/pLocalTmax; <<
145 229
146 if (cost > 1.0) { cost = 1.0; } << 230 if(verboseLevel>1)
147 else if(cost < -1.0) { cost = -1.0; } << 231 G4cout <<"type= " << gtype <<" t= " << t << " tmax= " << tmax
>> 232 << " ptot= " << ptot << G4endl;
148 233
>> 234 // Sampling in CM system
>> 235 G4double phi = G4UniformRand()*twopi;
>> 236 G4double cost = 1. - 2.0*t/tmax;
>> 237 if(std::abs(cost) > 1.0) cost = -1.0 + 2.0*G4UniformRand();
149 G4double sint = std::sqrt((1.0-cost)*(1.0+co 238 G4double sint = std::sqrt((1.0-cost)*(1.0+cost));
>> 239
>> 240 if (verboseLevel>1)
>> 241 G4cout << "cos(t)=" << cost << " std::sin(t)=" << sint << G4endl;
150 242
151 if (verboseLevel>1) { << 243 G4ThreeVector v1(sint*std::cos(phi),sint*std::sin(phi),cost);
152 G4cout << " t= " << t << " tmax(GeV^2)= " << 244 v1 *= ptot;
153 << " Pcms(GeV)= " << momentumCMS/GeV << " << 245 G4LorentzVector nlv1(v1.x(),v1.y(),v1.z(),std::sqrt(ptot*ptot + m1*m1));
154 << " sin(t)=" << sint << G4endl; <<
155 } <<
156 G4LorentzVector nlv1(momentumCMS*sint*std::c <<
157 momentumCMS*sint*std::sin(phi), <<
158 momentumCMS*cost, <<
159 std::sqrt(momentumCMS*momentumCMS + <<
160 246
161 nlv1.boost(bst); 247 nlv1.boost(bst);
162 248
163 G4double eFinal = nlv1.e() - m1; 249 G4double eFinal = nlv1.e() - m1;
164 if (verboseLevel > 1) { << 250 if (verboseLevel > 1)
165 G4cout <<"G4HadronElastic: m= " << m1 << " << 251 G4cout << "Scattered: "
166 << " 4-M Final: " << nlv1 << 252 << nlv1<<" m= " << m1 << " ekin(MeV)= " << eFinal
>> 253 << " Proj: 4-mom " << lv1
>> 254 <<G4endl;
>> 255 if(eFinal < 0.0) {
>> 256 G4cout << "G4HadronElastic WARNING ekin= " << eFinal
>> 257 << " after scattering of "
>> 258 << aParticle->GetDefinition()->GetParticleName()
>> 259 << " p(GeV/c)= " << plab
>> 260 << " on " << theDef->GetParticleName()
167 << G4endl; 261 << G4endl;
>> 262 eFinal = 0.0;
>> 263 nlv1.setE(m1);
168 } 264 }
169 265
170 if(eFinal <= 0.0) { << 266 theParticleChange.SetMomentumChange(nlv1.vect().unit());
171 theParticleChange.SetMomentumChange(0.0,0. << 267 theParticleChange.SetEnergyChange(eFinal);
172 theParticleChange.SetEnergyChange(0.0); << 268
173 } else { << 269 G4LorentzVector nlv0 = lv - nlv1;
174 theParticleChange.SetMomentumChange(nlv1.v << 270 G4double erec = nlv0.e() - m2;
175 theParticleChange.SetEnergyChange(eFinal); << 271 if (verboseLevel > 1)
176 } << 272 G4cout << "Recoil: "
177 lv -= nlv1; << 273 << nlv0<<" m= " << m2 << " ekin(MeV)= " << erec
178 G4double erec = std::max(lv.e() - mass2, 0. << 274 <<G4endl;
179 if (verboseLevel > 1) { << 275
180 G4cout << "Recoil: " <<" m= " << mass2 << << 276 if(erec > lowEnergyRecoilLimit) {
181 << " 4-mom: " << lv << 277 G4DynamicParticle * aSec = new G4DynamicParticle(theDef, nlv0);
182 << G4endl; << 278 theParticleChange.AddSecondary(aSec);
183 } <<
184 <<
185 // the recoil is created if kinetic energy a <<
186 if(erec > GetRecoilEnergyThreshold()) { <<
187 G4ParticleDefinition * theDef = nullptr; <<
188 if(Z == 1 && A == 1) { theDef = theP <<
189 else if (Z == 1 && A == 2) { theDef = theD <<
190 else if (Z == 1 && A == 3) { theDef = G4Tr <<
191 else if (Z == 2 && A == 3) { theDef = G4He <<
192 else if (Z == 2 && A == 4) { theDef = theA <<
193 else { <<
194 theDef = <<
195 G4ParticleTable::GetParticleTable()->GetIonT <<
196 } <<
197 G4DynamicParticle * aSec = new G4DynamicPa <<
198 theParticleChange.AddSecondary(aSec, secID <<
199 } else { 279 } else {
>> 280 if(erec < 0.0) erec = 0.0;
200 theParticleChange.SetLocalEnergyDeposit(er 281 theParticleChange.SetLocalEnergyDeposit(erec);
201 } 282 }
202 283
203 return &theParticleChange; 284 return &theParticleChange;
204 } 285 }
205 286
206 // sample momentum transfer in the CMS system <<
207 G4double 287 G4double
208 G4HadronElastic::SampleInvariantT(const G4Part << 288 G4HadronElastic::SampleT(G4double, G4double, G4double, G4double atno2)
209 G4double mom, G4int, G4int A) <<
210 { 289 {
211 const G4double plabLowLimit = 400.0*CLHEP::M << 290 // G4cout << "Entering elastic scattering 2"<<G4endl;
212 const G4double GeV2 = GeV*GeV; << 291 // Compute the direction of elastic scattering.
213 const G4double z07in13 = std::pow(0.7, 0.333 << 292 // It is planned to replace this code with a method based on
214 const G4double numLimit = 18.; << 293 // parameterized functions and a Monte Carlo method to invert the CDF.
215 << 294
216 G4int pdg = std::abs(part->GetPDGEncoding()) << 295 G4double ran = G4UniformRand();
217 G4double tmax = pLocalTmax/GeV2; << 296 G4double aa, bb, cc, dd, rr;
218 << 297 if (atno2 <= 62.) {
219 G4double aa, bb, cc, dd; << 298 aa = std::pow(atno2, 1.63);
220 G4Pow* g4pow = G4Pow::GetInstance(); << 299 bb = 14.5*std::pow(atno2, 0.66);
221 if (A <= 62) { << 300 cc = 1.4*std::pow(atno2, 0.33);
222 if (pdg == 211){ //Pions << 301 dd = 10.;
223 if(mom >= plabLowLimit){ //High ener << 302 } else {
224 bb = 14.5*g4pow->Z23(A);/*14.5*/ << 303 aa = std::pow(atno2, 1.33);
225 dd = 10.; << 304 bb = 60.*std::pow(atno2, 0.33);
226 cc = 0.075*g4pow->Z13(A)/dd;//1.4 << 305 cc = 0.4*std::pow(atno2, 0.40);
227 //aa = g4pow->powZ(A, 1.93)/bb;//1.63 << 306 dd = 10.;
228 aa = (A*A)/bb;//1.63 << 307 }
229 } else { //Low ene << 308 aa = aa/bb;
230 bb = 29.*z07in13*z07in13*g4pow->Z23(A); << 309 cc = cc/dd;
231 dd = 15.; << 310 rr = (aa + cc)*ran;
232 cc = 0.04*g4pow->Z13(A)/dd;//1.4 << 311 if (verboseLevel > 1) {
233 aa = g4pow->powZ(A, 1.63)/bb;//1.63 << 312 G4cout << "DoIt: aa,bb,cc,dd,rr" << G4endl;
234 } << 313 G4cout << aa << " " << bb << " " << cc << " " << dd << " " << rr << G4endl;
235 } else { //Other particles << 314 }
236 bb = 14.5*g4pow->Z23(A); << 315 G4double t1 = -std::log(ran)/bb;
237 dd = 20.; << 316 G4double t2 = -std::log(ran)/dd;
238 aa = (A*A)/bb;//1.63 << 317 if (verboseLevel > 1) {
239 cc = 1.4*g4pow->Z13(A)/dd; << 318 G4cout << "t1,Fctcos " << t1 << " " << Fctcos(t1, aa, bb, cc, dd, rr) << G4endl;
240 } << 319 G4cout << "t2,Fctcos " << t2 << " " << Fctcos(t2, aa, bb, cc, dd, rr) << G4endl;
241 //=========================== << 320 }
242 } else { //(A>62) << 321 G4double eps = 0.001;
243 if (pdg == 211) { << 322 G4int ind1 = 10;
244 if(mom >= plabLowLimit){ //high << 323 G4double t = 0.0;
245 bb = 60.*z07in13*g4pow->Z13(A);//60 << 324 G4int ier1;
246 dd = 30.; << 325 ier1 = Rtmi(&t, t1, t2, eps, ind1,
247 aa = 0.5*(A*A)/bb;//1.33 << 326 aa, bb, cc, dd, rr);
248 cc = 4.*g4pow->powZ(A,0.4)/dd;//1:0.4 -- << 327 if (verboseLevel > 1) {
249 } else { //low << 328 G4cout << "From Rtmi, ier1=" << ier1 << G4endl;
250 bb = 120.*z07in13*g4pow->Z13(A);//60 << 329 G4cout << "t, Fctcos " << t << " " << Fctcos(t, aa, bb, cc, dd, rr) << G4endl;
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 } 330 }
262 G4double q1 = 1.0 - G4Exp(-std::min(bb*tmax, << 331 if (ier1 != 0) t = 0.25*(3.*t1 + t2);
263 G4double q2 = 1.0 - G4Exp(-std::min(dd*tmax, << 332 if (verboseLevel > 1) {
264 G4double s1 = q1*aa; << 333 G4cout << "t, Fctcos " << t << " " << Fctcos(t, aa, bb, cc, dd, rr) <<
265 G4double s2 = q2*cc; << 334 G4endl;
266 if((s1 + s2)*G4UniformRand() < s2) { <<
267 q1 = q2; <<
268 bb = dd; <<
269 } 335 }
270 return -GeV2*G4Log(1.0 - G4UniformRand()*q1) << 336 return t;
271 } 337 }
272 338
273 ////////////////////////////////////////////// << 339 // The following is a "translation" of a root-finding routine
274 // << 340 // from GEANT3.21/GHEISHA. Some of the labelled block structure has
275 // Cofs for s-,c-,b-particles ds/dt slopes << 341 // been retained for clarity. This routine will not be needed after
276 << 342 // the planned revisions to DoIt().
277 G4double G4HadronElastic::GetSlopeCof(const G4 << 343
>> 344 G4int
>> 345 G4HadronElastic::Rtmi(G4double* x, G4double xli, G4double xri, G4double eps,
>> 346 G4int iend,
>> 347 G4double aa, G4double bb, G4double cc, G4double dd,
>> 348 G4double rr)
278 { 349 {
279 // The input parameter "pdg" should be the a << 350 G4int ier = 0;
280 // (i.e. the same value for a particle and i << 351 G4double xl = xli;
>> 352 G4double xr = xri;
>> 353 *x = xl;
>> 354 G4double tol = *x;
>> 355 G4double f = Fctcos(tol, aa, bb, cc, dd, rr);
>> 356 if (f == 0.) return ier;
>> 357 G4double fl, fr;
>> 358 fl = f;
>> 359 *x = xr;
>> 360 tol = *x;
>> 361 f = Fctcos(tol, aa, bb, cc, dd, rr);
>> 362 if (f == 0.) return ier;
>> 363 fr = f;
>> 364
>> 365 // Error return in case of wrong input data
>> 366 if (fl*fr >= 0.) {
>> 367 ier = 2;
>> 368 return ier;
>> 369 }
>> 370
>> 371 // Basic assumption fl*fr less than 0 is satisfied.
>> 372 // Generate tolerance for function values.
>> 373 G4int i = 0;
>> 374 G4double tolf = 100.*eps;
>> 375
>> 376 // Start iteration loop
>> 377 label4:
>> 378 i++;
>> 379
>> 380 // Start bisection loop
>> 381 for (G4int k = 1; k <= iend; k++) {
>> 382 *x = 0.5*(xl + xr);
>> 383 tol = *x;
>> 384 f = Fctcos(tol, aa, bb, cc, dd, rr);
>> 385 if (f == 0.) return 0;
>> 386 if (f*fr < 0.) { // Interchange xl and xr in order to get the
>> 387 tol = xl; // same Sign in f and fr
>> 388 xl = xr;
>> 389 xr = tol;
>> 390 tol = fl;
>> 391 fl = fr;
>> 392 fr = tol;
>> 393 }
>> 394 tol = f - fl;
>> 395 G4double a = f*tol;
>> 396 a = a + a;
>> 397 if (a < fr*(fr - fl) && i <= iend) goto label17;
>> 398 xr = *x;
>> 399 fr = f;
>> 400
>> 401 // Test on satisfactory accuracy in bisection loop
>> 402 tol = eps;
>> 403 a = std::abs(xr);
>> 404 if (a > 1.) tol = tol*a;
>> 405 if (std::abs(xr - xl) <= tol && std::abs(fr - fl) <= tolf) goto label14;
>> 406 }
>> 407 // End of bisection loop
>> 408
>> 409 // No convergence after iend iteration steps followed by iend
>> 410 // successive steps of bisection or steadily increasing function
>> 411 // values at right bounds. Error return.
>> 412 ier = 1;
>> 413
>> 414 label14:
>> 415 if (std::abs(fr) > std::abs(fl)) {
>> 416 *x = xl;
>> 417 f = fl;
>> 418 }
>> 419 return ier;
>> 420
>> 421 // Computation of iterated x-value by inverse parabolic interp
>> 422 label17:
>> 423 G4double a = fr - f;
>> 424 G4double dx = (*x - xl)*fl*(1. + f*(a - tol)/(a*(fr - fl)))/tol;
>> 425 G4double xm = *x;
>> 426 G4double fm = f;
>> 427 *x = xl - dx;
>> 428 tol = *x;
>> 429 f = Fctcos(tol, aa, bb, cc, dd, rr);
>> 430 if (f == 0.) return ier;
>> 431
>> 432 // Test on satisfactory accuracy in iteration loop
>> 433 tol = eps;
>> 434 a = std::abs(*x);
>> 435 if (a > 1) tol = tol*a;
>> 436 if (std::abs(dx) <= tol && std::abs(f) <= tolf) return ier;
>> 437
>> 438 // Preparation of next bisection loop
>> 439 if (f*fl < 0.) {
>> 440 xr = *x;
>> 441 fr = f;
>> 442 }
>> 443 else {
>> 444 xl = *x;
>> 445 fl = f;
>> 446 xr = xm;
>> 447 fr = fm;
>> 448 }
>> 449 goto label4;
>> 450 }
281 451
282 G4double coeff = 1.0; <<
283 452
284 // heavy barions << 453 // Test function for root-finder
285 454
286 static const G4double lBarCof1S = 0.88; << 455 G4double
287 static const G4double lBarCof2S = 0.76; << 456 G4HadronElastic::Fctcos(G4double t,
288 static const G4double lBarCof3S = 0.64; << 457 G4double aa, G4double bb, G4double cc, G4double dd,
289 static const G4double lBarCof1C = 0.784378 << 458 G4double rr)
290 static const G4double lBarCofSC = 0.664378 << 459 {
291 static const G4double lBarCof2SC = 0.544378 << 460 const G4double expxl = -82.;
292 static const G4double lBarCof1B = 0.740659 << 461 const G4double expxu = 82.;
293 static const G4double lBarCofSB = 0.620659 << 462
294 static const G4double lBarCof2SB = 0.500659 << 463 G4double test1 = -bb*t;
295 << 464 if (test1 > expxu) test1 = expxu;
296 if( pdg == 3122 || pdg == 3222 || pdg == 31 << 465 if (test1 < expxl) test1 = expxl;
297 { << 466
298 coeff = lBarCof1S; // Lambda, Sigma+, Sigm << 467 G4double test2 = -dd*t;
299 << 468 if (test2 > expxu) test2 = expxu;
300 } else if( pdg == 3322 || pdg == 3312 ) << 469 if (test2 < expxl) test2 = expxl;
301 { << 470
302 coeff = lBarCof2S; // Xi-, Xi0 << 471 return aa*std::exp(test1) + cc*std::exp(test2) - rr;
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 } 472 }
386 473
387 474
>> 475 void
>> 476 G4HadronElastic::Defs1(G4double p, G4double px, G4double py, G4double pz,
>> 477 G4double pxinc, G4double pyinc, G4double pzinc,
>> 478 G4double* pxnew, G4double* pynew, G4double* pznew)
>> 479 {
>> 480 // Transform scattered particle to reflect direction of incident particle
>> 481 G4double pt2 = pxinc*pxinc + pyinc*pyinc;
>> 482 if (pt2 > 0.) {
>> 483 G4double cost = pzinc/p;
>> 484 G4double sint1 = std::sqrt(std::abs((1. - cost )*(1.+cost)));
>> 485 G4double sint2 = std::sqrt(pt2)/p;
>> 486 G4double sint = 0.5*(sint1 + sint2);
>> 487 G4double ph = pi*0.5;
>> 488 if (pyinc < 0.) ph = pi*1.5;
>> 489 if (std::abs(pxinc) > 1.e-6) ph = std::atan2(pyinc, pxinc);
>> 490 G4double cosp = std::cos(ph);
>> 491 G4double sinp = std::sin(ph);
>> 492 if (verboseLevel > 1) {
>> 493 G4cout << "cost sint " << cost << " " << sint << G4endl;
>> 494 G4cout << "cosp sinp " << cosp << " " << sinp << G4endl;
>> 495 }
>> 496 *pxnew = cost*cosp*px - sinp*py + sint*cosp*pz;
>> 497 *pynew = cost*sinp*px + cosp*py + sint*sinp*pz;
>> 498 *pznew = -sint*px +cost*pz;
>> 499 }
>> 500 else {
>> 501 G4double cost=pzinc/p;
>> 502 *pxnew = cost*px;
>> 503 *pynew = py;
>> 504 *pznew = cost*pz;
>> 505 }
>> 506 }
388 507