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25 // 25 //
>> 26 // $Id: G4HadronElastic.cc,v 1.55 2007/12/10 09:56:01 vnivanch Exp $
>> 27 // GEANT4 tag $Name: geant4-09-01 $
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 // 30-Mar-07 V.Ivanchenko lowEnergyLimitQ=0, lowEnergyLimitHE = 1.0*GeV,
>> 59 // lowestEnergyLimit= 0
>> 60 // 04-May-07 V.Ivanchenko do not use HE model for hydrogen target to avoid NaN;
>> 61 // use QElastic for p, n incident for any energy for
>> 62 // p and He targets only
>> 63 // 11-May-07 V.Ivanchenko remove unused method Defs1
>> 64 //
31 65
32 #include "G4HadronElastic.hh" 66 #include "G4HadronElastic.hh"
33 #include "G4SystemOfUnits.hh" <<
34 #include "G4ParticleTable.hh" 67 #include "G4ParticleTable.hh"
35 #include "G4ParticleDefinition.hh" 68 #include "G4ParticleDefinition.hh"
36 #include "G4IonTable.hh" 69 #include "G4IonTable.hh"
>> 70 #include "G4QElasticCrossSection.hh"
>> 71 #include "G4VQCrossSection.hh"
>> 72 #include "G4ElasticHadrNucleusHE.hh"
37 #include "Randomize.hh" 73 #include "Randomize.hh"
38 #include "G4Proton.hh" 74 #include "G4Proton.hh"
39 #include "G4Neutron.hh" 75 #include "G4Neutron.hh"
40 #include "G4Deuteron.hh" 76 #include "G4Deuteron.hh"
41 #include "G4Alpha.hh" 77 #include "G4Alpha.hh"
42 #include "G4Pow.hh" << 78 #include "G4PionPlus.hh"
43 #include "G4Exp.hh" << 79 #include "G4PionMinus.hh"
44 #include "G4Log.hh" <<
45 #include "G4HadronicParameters.hh" <<
46 #include "G4PhysicsModelCatalog.hh" <<
47 <<
48 80
49 G4HadronElastic::G4HadronElastic(const G4Strin << 81 G4HadronElastic::G4HadronElastic(G4ElasticHadrNucleusHE* HModel)
50 : G4HadronicInteraction(name), secID(-1) << 82 : G4HadronicInteraction("G4HadronElastic"), hElastic(HModel)
51 { 83 {
52 SetMinEnergy( 0.0*GeV ); 84 SetMinEnergy( 0.0*GeV );
53 SetMaxEnergy( G4HadronicParameters::Instance << 85 SetMaxEnergy( 100.*TeV );
54 lowestEnergyLimit= 1.e-6*eV; << 86 verboseLevel= 0;
55 pLocalTmax = 0.0; << 87 lowEnergyRecoilLimit = 100.*keV;
56 nwarn = 0; << 88 lowEnergyLimitQ = 0.0*GeV;
>> 89 lowEnergyLimitHE = DBL_MAX;
>> 90 lowestEnergyLimit= 0.0*keV;
>> 91 plabLowLimit = 20.0*MeV;
>> 92
>> 93 qCManager = G4QElasticCrossSection::GetPointer();
>> 94 if(!hElastic) hElastic = new G4ElasticHadrNucleusHE();
57 95
58 theProton = G4Proton::Proton(); 96 theProton = G4Proton::Proton();
59 theNeutron = G4Neutron::Neutron(); 97 theNeutron = G4Neutron::Neutron();
60 theDeuteron = G4Deuteron::Deuteron(); 98 theDeuteron = G4Deuteron::Deuteron();
61 theAlpha = G4Alpha::Alpha(); 99 theAlpha = G4Alpha::Alpha();
62 << 100 thePionPlus = G4PionPlus::PionPlus();
63 secID = G4PhysicsModelCatalog::GetModelID( " << 101 thePionMinus= G4PionMinus::PionMinus();
64 } 102 }
65 103
66 G4HadronElastic::~G4HadronElastic() 104 G4HadronElastic::~G4HadronElastic()
67 {} << 105 {
>> 106 delete hElastic;
>> 107 }
68 108
>> 109 G4VQCrossSection* G4HadronElastic::GetCS()
>> 110 {
>> 111 return qCManager;
>> 112 }
69 113
70 void G4HadronElastic::ModelDescription(std::os << 114 G4ElasticHadrNucleusHE* G4HadronElastic::GetHElastic()
71 { 115 {
72 outFile << "G4HadronElastic is the base clas << 116 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 } 117 }
80 118
81 G4HadFinalState* G4HadronElastic::ApplyYoursel 119 G4HadFinalState* G4HadronElastic::ApplyYourself(
82 const G4HadProjectile& aTrack, G4Nucleus& 120 const G4HadProjectile& aTrack, G4Nucleus& targetNucleus)
83 { 121 {
84 theParticleChange.Clear(); 122 theParticleChange.Clear();
85 123
86 const G4HadProjectile* aParticle = &aTrack; 124 const G4HadProjectile* aParticle = &aTrack;
87 G4double ekin = aParticle->GetKineticEnergy( 125 G4double ekin = aParticle->GetKineticEnergy();
88 <<
89 // no scattering below the limit <<
90 if(ekin <= lowestEnergyLimit) { 126 if(ekin <= lowestEnergyLimit) {
91 theParticleChange.SetEnergyChange(ekin); 127 theParticleChange.SetEnergyChange(ekin);
92 theParticleChange.SetMomentumChange(0.,0., << 128 theParticleChange.SetMomentumChange(aTrack.Get4Momentum().vect().unit());
93 return &theParticleChange; 129 return &theParticleChange;
94 } 130 }
95 131
96 G4int A = targetNucleus.GetA_asInt(); << 132 G4double aTarget = targetNucleus.GetN();
97 G4int Z = targetNucleus.GetZ_asInt(); << 133 G4double zTarget = targetNucleus.GetZ();
>> 134
>> 135 G4double plab = aParticle->GetTotalMomentum();
>> 136 if (verboseLevel >1)
>> 137 G4cout << "G4HadronElastic::DoIt: Incident particle plab="
>> 138 << plab/GeV << " GeV/c "
>> 139 << " ekin(MeV) = " << ekin/MeV << " "
>> 140 << aParticle->GetDefinition()->GetParticleName() << G4endl;
98 141
99 // Scattered particle referred to axis of in 142 // Scattered particle referred to axis of incident particle
100 const G4ParticleDefinition* theParticle = aP 143 const G4ParticleDefinition* theParticle = aParticle->GetDefinition();
101 G4double m1 = theParticle->GetPDGMass(); 144 G4double m1 = theParticle->GetPDGMass();
102 G4double plab = std::sqrt(ekin*(ekin + 2.0*m <<
103 145
104 if (verboseLevel>1) { << 146 G4int Z = static_cast<G4int>(zTarget+0.5);
105 G4cout << "G4HadronElastic: " << 147 G4int A = static_cast<G4int>(aTarget+0.5);
106 << aParticle->GetDefinition()->GetParticl << 148 G4int N = A - Z;
107 << " Plab(GeV/c)= " << plab/GeV << 149 G4int projPDG = theParticle->GetPDGEncoding();
108 << " Ekin(MeV) = " << ekin/MeV << 150 if (verboseLevel>1)
109 << " scattered off Z= " << Z << 151 G4cout << "G4HadronElastic for " << theParticle->GetParticleName()
110 << " A= " << A << 152 << " PDGcode= " << projPDG << " on nucleus Z= " << Z
>> 153 << " A= " << A << " N= " << N
111 << G4endl; 154 << G4endl;
112 } <<
113 155
114 G4double mass2 = G4NucleiProperties::GetNucl << 156 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( <<
119 157
120 pLocalTmax = 4.0*momentumCMS*momentumCMS; << 158 if(Z == 1 && A == 1) theDef = theProton;
>> 159 else if (Z == 1 && A == 2) theDef = theDeuteron;
>> 160 else if (Z == 1 && A == 3) theDef = G4Triton::Triton();
>> 161 else if (Z == 2 && A == 3) theDef = G4He3::He3();
>> 162 else if (Z == 2 && A == 4) theDef = theAlpha;
>> 163 else theDef = G4ParticleTable::GetParticleTable()->FindIon(Z,A,0,Z);
>> 164
>> 165 G4double m2 = theDef->GetPDGMass();
>> 166 G4LorentzVector lv1 = aParticle->Get4Momentum();
>> 167 G4LorentzVector lv(0.0,0.0,0.0,m2);
>> 168 lv += lv1;
121 169
122 // Sampling in CM system << 170 G4ThreeVector bst = lv.boostVector();
123 G4double t = SampleInvariantT(theParticle, p << 171 lv1.boost(-bst);
124 172
125 if(t < 0.0 || t > pLocalTmax) { << 173 G4ThreeVector p1 = lv1.vect();
126 // For the very rare cases where cos(theta << 174 G4double ptot = p1.mag();
127 // print some debugging information via a << 175 G4double tmax = 4.0*ptot*ptot;
128 // using the default algorithm << 176 G4double t = 0.0;
129 #ifdef G4VERBOSE << 177
130 if(nwarn < 2) { << 178 // Choose generator
131 G4ExceptionDescription ed; << 179 G4ElasticGenerator gtype = fLElastic;
132 ed << GetModelName() << " wrong sampling << 180
133 << " for " << aParticle->GetDefinition()->G << 181 // Q-elastic for p,n scattering on H and He
134 << " ekin=" << ekin << " MeV" << 182 if (theParticle == theProton || theParticle == theNeutron)
135 << " off (Z,A)=(" << Z << "," << A << ") - << 183 // && Z <= 2 && ekin >= lowEnergyLimitQ)
136 G4Exception( "G4HadronElastic::ApplyYour << 184 gtype = fQElastic;
137 ++nwarn; << 185
>> 186 else {
>> 187 // S-wave for very low energy
>> 188 if(plab < plabLowLimit) gtype = fSWave;
>> 189 // HE-elastic for energetic projectile mesons
>> 190 // else if(ekin >= lowEnergyLimitHE && theParticle->GetBaryonNumber() == 0)
>> 191 else if(ekin >= lowEnergyLimitHE && (theParticle == thePionPlus || theParticle == thePionMinus))
>> 192 gtype = fHElastic;
>> 193 }
>> 194
>> 195 //
>> 196 // Sample t
>> 197 //
>> 198 if(gtype == fQElastic) {
>> 199 if (verboseLevel >1)
>> 200 G4cout << "G4HadronElastic: Z= " << Z << " N= "
>> 201 << N << " pdg= " << projPDG
>> 202 << " mom(GeV)= " << plab/GeV << " " << qCManager << G4endl;
>> 203 if(Z == 1 && N == 2) N = 1;
>> 204 else if(Z == 2 && N == 1) N = 2;
>> 205 G4double cs = qCManager->GetCrossSection(false,plab,Z,N,projPDG);
>> 206
>> 207 // check if cross section is reasonable
>> 208 if(cs > 0.0) t = qCManager->GetExchangeT(Z,N,projPDG);
>> 209 else if(plab > plabLowLimit) gtype = fLElastic;
>> 210 else gtype = fSWave;
>> 211 }
>> 212
>> 213 if(gtype == fLElastic) {
>> 214 t = GeV*GeV*SampleT(ptot,m1,m2,aTarget);
>> 215 }
>> 216
>> 217 // use mean atomic number
>> 218 if(gtype == fHElastic) {
>> 219 t = hElastic->SampleT(theParticle,plab,Z,A);
>> 220 }
>> 221
>> 222 // NaN finder
>> 223 if(!(t < 0.0 || t >= 0.0)) {
>> 224 if (verboseLevel > 0) {
>> 225 G4cout << "G4HadronElastic:WARNING: Z= " << Z << " N= "
>> 226 << N << " pdg= " << projPDG
>> 227 << " mom(GeV)= " << plab/GeV
>> 228 << " the model type " << gtype;
>> 229 if(gtype == fQElastic) G4cout << " CHIPS ";
>> 230 else if(gtype == fLElastic) G4cout << " LElastic ";
>> 231 else if(gtype == fHElastic) G4cout << " HElastic ";
>> 232 G4cout << " S-wave will be sampled"
>> 233 << G4endl;
138 } 234 }
139 #endif << 235 t = 0.0;
140 t = G4HadronElastic::SampleInvariantT(theP <<
141 } 236 }
142 237
143 G4double phi = G4UniformRand()*CLHEP::twopi << 238 if(gtype == fSWave) t = G4UniformRand()*tmax;
144 G4double cost = 1. - 2.0*t/pLocalTmax; <<
145 239
146 if (cost > 1.0) { cost = 1.0; } << 240 if(verboseLevel>1)
147 else if(cost < -1.0) { cost = -1.0; } << 241 G4cout <<"type= " << gtype <<" t= " << t << " tmax= " << tmax
>> 242 << " ptot= " << ptot << G4endl;
148 243
149 G4double sint = std::sqrt((1.0-cost)*(1.0+co << 244 // Sampling in CM system
>> 245 G4double phi = G4UniformRand()*twopi;
>> 246 G4double cost = 1. - 2.0*t/tmax;
>> 247 G4double sint;
150 248
151 if (verboseLevel>1) { << 249 if( cost >= 1.0 )
152 G4cout << " t= " << t << " tmax(GeV^2)= " << 250 {
153 << " Pcms(GeV)= " << momentumCMS/GeV << " << 251 cost = 1.0;
154 << " sin(t)=" << sint << G4endl; << 252 sint = 0.0;
>> 253 }
>> 254 else if( cost <= -1.0)
>> 255 {
>> 256 cost = -1.0;
>> 257 sint = 0.0;
155 } 258 }
156 G4LorentzVector nlv1(momentumCMS*sint*std::c << 259 else
157 momentumCMS*sint*std::sin(phi), << 260 {
158 momentumCMS*cost, << 261 sint = std::sqrt((1.0-cost)*(1.0+cost));
159 std::sqrt(momentumCMS*momentumCMS + << 262 }
>> 263 if (verboseLevel>1)
>> 264 G4cout << "cos(t)=" << cost << " std::sin(t)=" << sint << G4endl;
>> 265
>> 266 G4ThreeVector v1(sint*std::cos(phi),sint*std::sin(phi),cost);
>> 267 v1 *= ptot;
>> 268 G4LorentzVector nlv1(v1.x(),v1.y(),v1.z(),std::sqrt(ptot*ptot + m1*m1));
160 269
161 nlv1.boost(bst); 270 nlv1.boost(bst);
162 271
163 G4double eFinal = nlv1.e() - m1; 272 G4double eFinal = nlv1.e() - m1;
164 if (verboseLevel > 1) { << 273 if (verboseLevel > 1)
165 G4cout <<"G4HadronElastic: m= " << m1 << " << 274 G4cout << "Scattered: "
166 << " 4-M Final: " << nlv1 << 275 << nlv1<<" m= " << m1 << " ekin(MeV)= " << eFinal
>> 276 << " Proj: 4-mom " << lv1
>> 277 <<G4endl;
>> 278 if(eFinal < 0.0) {
>> 279 G4cout << "G4HadronElastic WARNING ekin= " << eFinal
>> 280 << " after scattering of "
>> 281 << aParticle->GetDefinition()->GetParticleName()
>> 282 << " p(GeV/c)= " << plab
>> 283 << " on " << theDef->GetParticleName()
167 << G4endl; 284 << G4endl;
>> 285 eFinal = 0.0;
>> 286 nlv1.setE(m1);
168 } 287 }
169 288
170 if(eFinal <= 0.0) { << 289 theParticleChange.SetMomentumChange(nlv1.vect().unit());
171 theParticleChange.SetMomentumChange(0.0,0. << 290 theParticleChange.SetEnergyChange(eFinal);
172 theParticleChange.SetEnergyChange(0.0); << 291
173 } else { << 292 G4LorentzVector nlv0 = lv - nlv1;
174 theParticleChange.SetMomentumChange(nlv1.v << 293 G4double erec = nlv0.e() - m2;
175 theParticleChange.SetEnergyChange(eFinal); << 294 if (verboseLevel > 1)
176 } << 295 G4cout << "Recoil: "
177 lv -= nlv1; << 296 << nlv0<<" m= " << m2 << " ekin(MeV)= " << erec
178 G4double erec = std::max(lv.e() - mass2, 0. << 297 <<G4endl;
179 if (verboseLevel > 1) { << 298
180 G4cout << "Recoil: " <<" m= " << mass2 << << 299 if(erec > lowEnergyRecoilLimit) {
181 << " 4-mom: " << lv << 300 G4DynamicParticle * aSec = new G4DynamicParticle(theDef, nlv0);
182 << G4endl; << 301 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 { 302 } else {
>> 303 if(erec < 0.0) erec = 0.0;
200 theParticleChange.SetLocalEnergyDeposit(er 304 theParticleChange.SetLocalEnergyDeposit(erec);
201 } 305 }
202 306
203 return &theParticleChange; 307 return &theParticleChange;
204 } 308 }
205 309
206 // sample momentum transfer in the CMS system <<
207 G4double 310 G4double
208 G4HadronElastic::SampleInvariantT(const G4Part << 311 G4HadronElastic::SampleT(G4double, G4double, G4double, G4double atno2)
209 G4double mom, G4int, G4int A) <<
210 { 312 {
211 const G4double plabLowLimit = 400.0*CLHEP::M << 313 // G4cout << "Entering elastic scattering 2"<<G4endl;
212 const G4double GeV2 = GeV*GeV; << 314 // Compute the direction of elastic scattering.
213 const G4double z07in13 = std::pow(0.7, 0.333 << 315 // It is planned to replace this code with a method based on
214 const G4double numLimit = 18.; << 316 // parameterized functions and a Monte Carlo method to invert the CDF.
215 << 317
216 G4int pdg = std::abs(part->GetPDGEncoding()) << 318 G4double ran = G4UniformRand();
217 G4double tmax = pLocalTmax/GeV2; << 319 G4double aa, bb, cc, dd, rr;
218 << 320 if (atno2 <= 62.) {
219 G4double aa, bb, cc, dd; << 321 aa = std::pow(atno2, 1.63);
220 G4Pow* g4pow = G4Pow::GetInstance(); << 322 bb = 14.5*std::pow(atno2, 0.66);
221 if (A <= 62) { << 323 cc = 1.4*std::pow(atno2, 0.33);
222 if (pdg == 211){ //Pions << 324 dd = 10.;
223 if(mom >= plabLowLimit){ //High ener << 325 } else {
224 bb = 14.5*g4pow->Z23(A);/*14.5*/ << 326 aa = std::pow(atno2, 1.33);
225 dd = 10.; << 327 bb = 60.*std::pow(atno2, 0.33);
226 cc = 0.075*g4pow->Z13(A)/dd;//1.4 << 328 cc = 0.4*std::pow(atno2, 0.40);
227 //aa = g4pow->powZ(A, 1.93)/bb;//1.63 << 329 dd = 10.;
228 aa = (A*A)/bb;//1.63 << 330 }
229 } else { //Low ene << 331 aa = aa/bb;
230 bb = 29.*z07in13*z07in13*g4pow->Z23(A); << 332 cc = cc/dd;
231 dd = 15.; << 333 rr = (aa + cc)*ran;
232 cc = 0.04*g4pow->Z13(A)/dd;//1.4 << 334 if (verboseLevel > 1) {
233 aa = g4pow->powZ(A, 1.63)/bb;//1.63 << 335 G4cout << "DoIt: aa,bb,cc,dd,rr" << G4endl;
234 } << 336 G4cout << aa << " " << bb << " " << cc << " " << dd << " " << rr << G4endl;
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 } 337 }
262 G4double q1 = 1.0 - G4Exp(-std::min(bb*tmax, << 338 G4double t1 = -std::log(ran)/bb;
263 G4double q2 = 1.0 - G4Exp(-std::min(dd*tmax, << 339 G4double t2 = -std::log(ran)/dd;
264 G4double s1 = q1*aa; << 340 if (verboseLevel > 1) {
265 G4double s2 = q2*cc; << 341 G4cout << "t1,Fctcos " << t1 << " " << Fctcos(t1, aa, bb, cc, dd, rr) << G4endl;
266 if((s1 + s2)*G4UniformRand() < s2) { << 342 G4cout << "t2,Fctcos " << t2 << " " << Fctcos(t2, aa, bb, cc, dd, rr) << G4endl;
267 q1 = q2; << 343 }
268 bb = dd; << 344 G4double eps = 0.001;
>> 345 G4int ind1 = 10;
>> 346 G4double t = 0.0;
>> 347 G4int ier1;
>> 348 ier1 = Rtmi(&t, t1, t2, eps, ind1,
>> 349 aa, bb, cc, dd, rr);
>> 350 if (verboseLevel > 1) {
>> 351 G4cout << "From Rtmi, ier1=" << ier1 << G4endl;
>> 352 G4cout << "t, Fctcos " << t << " " << Fctcos(t, aa, bb, cc, dd, rr) << G4endl;
>> 353 }
>> 354 if (ier1 != 0) t = 0.25*(3.*t1 + t2);
>> 355 if (verboseLevel > 1) {
>> 356 G4cout << "t, Fctcos " << t << " " << Fctcos(t, aa, bb, cc, dd, rr) <<
>> 357 G4endl;
269 } 358 }
270 return -GeV2*G4Log(1.0 - G4UniformRand()*q1) << 359 return t;
271 } 360 }
272 361
273 ////////////////////////////////////////////// << 362 // The following is a "translation" of a root-finding routine
274 // << 363 // from GEANT3.21/GHEISHA. Some of the labelled block structure has
275 // Cofs for s-,c-,b-particles ds/dt slopes << 364 // been retained for clarity. This routine will not be needed after
276 << 365 // the planned revisions to DoIt().
277 G4double G4HadronElastic::GetSlopeCof(const G4 << 366
>> 367 G4int
>> 368 G4HadronElastic::Rtmi(G4double* x, G4double xli, G4double xri, G4double eps,
>> 369 G4int iend,
>> 370 G4double aa, G4double bb, G4double cc, G4double dd,
>> 371 G4double rr)
278 { 372 {
279 // The input parameter "pdg" should be the a << 373 G4int ier = 0;
280 // (i.e. the same value for a particle and i << 374 G4double xl = xli;
281 << 375 G4double xr = xri;
282 G4double coeff = 1.0; << 376 *x = xl;
283 << 377 G4double tol = *x;
284 // heavy barions << 378 G4double f = Fctcos(tol, aa, bb, cc, dd, rr);
>> 379 if (f == 0.) return ier;
>> 380 G4double fl, fr;
>> 381 fl = f;
>> 382 *x = xr;
>> 383 tol = *x;
>> 384 f = Fctcos(tol, aa, bb, cc, dd, rr);
>> 385 if (f == 0.) return ier;
>> 386 fr = f;
>> 387
>> 388 // Error return in case of wrong input data
>> 389 if (fl*fr >= 0.) {
>> 390 ier = 2;
>> 391 return ier;
>> 392 }
>> 393
>> 394 // Basic assumption fl*fr less than 0 is satisfied.
>> 395 // Generate tolerance for function values.
>> 396 G4int i = 0;
>> 397 G4double tolf = 100.*eps;
>> 398
>> 399 // Start iteration loop
>> 400 label4:
>> 401 i++;
>> 402
>> 403 // Start bisection loop
>> 404 for (G4int k = 1; k <= iend; k++) {
>> 405 *x = 0.5*(xl + xr);
>> 406 tol = *x;
>> 407 f = Fctcos(tol, aa, bb, cc, dd, rr);
>> 408 if (f == 0.) return 0;
>> 409 if (f*fr < 0.) { // Interchange xl and xr in order to get the
>> 410 tol = xl; // same Sign in f and fr
>> 411 xl = xr;
>> 412 xr = tol;
>> 413 tol = fl;
>> 414 fl = fr;
>> 415 fr = tol;
>> 416 }
>> 417 tol = f - fl;
>> 418 G4double a = f*tol;
>> 419 a = a + a;
>> 420 if (a < fr*(fr - fl) && i <= iend) goto label17;
>> 421 xr = *x;
>> 422 fr = f;
>> 423
>> 424 // Test on satisfactory accuracy in bisection loop
>> 425 tol = eps;
>> 426 a = std::abs(xr);
>> 427 if (a > 1.) tol = tol*a;
>> 428 if (std::abs(xr - xl) <= tol && std::abs(fr - fl) <= tolf) goto label14;
>> 429 }
>> 430 // End of bisection loop
>> 431
>> 432 // No convergence after iend iteration steps followed by iend
>> 433 // successive steps of bisection or steadily increasing function
>> 434 // values at right bounds. Error return.
>> 435 ier = 1;
>> 436
>> 437 label14:
>> 438 if (std::abs(fr) > std::abs(fl)) {
>> 439 *x = xl;
>> 440 f = fl;
>> 441 }
>> 442 return ier;
>> 443
>> 444 // Computation of iterated x-value by inverse parabolic interp
>> 445 label17:
>> 446 G4double a = fr - f;
>> 447 G4double dx = (*x - xl)*fl*(1. + f*(a - tol)/(a*(fr - fl)))/tol;
>> 448 G4double xm = *x;
>> 449 G4double fm = f;
>> 450 *x = xl - dx;
>> 451 tol = *x;
>> 452 f = Fctcos(tol, aa, bb, cc, dd, rr);
>> 453 if (f == 0.) return ier;
>> 454
>> 455 // Test on satisfactory accuracy in iteration loop
>> 456 tol = eps;
>> 457 a = std::abs(*x);
>> 458 if (a > 1) tol = tol*a;
>> 459 if (std::abs(dx) <= tol && std::abs(f) <= tolf) return ier;
>> 460
>> 461 // Preparation of next bisection loop
>> 462 if (f*fl < 0.) {
>> 463 xr = *x;
>> 464 fr = f;
>> 465 }
>> 466 else {
>> 467 xl = *x;
>> 468 fl = f;
>> 469 xr = xm;
>> 470 fr = fm;
>> 471 }
>> 472 goto label4;
>> 473 }
285 474
286 static const G4double lBarCof1S = 0.88; << 475 // Test function for root-finder
287 static const G4double lBarCof2S = 0.76; << 476 G4double
288 static const G4double lBarCof3S = 0.64; << 477 G4HadronElastic::Fctcos(G4double t,
289 static const G4double lBarCof1C = 0.784378 << 478 G4double aa, G4double bb, G4double cc, G4double dd,
290 static const G4double lBarCofSC = 0.664378 << 479 G4double rr)
291 static const G4double lBarCof2SC = 0.544378 << 480 {
292 static const G4double lBarCof1B = 0.740659 << 481 const G4double expxl = -82.;
293 static const G4double lBarCofSB = 0.620659 << 482 const G4double expxu = 82.;
294 static const G4double lBarCof2SB = 0.500659 <<
295 <<
296 if( pdg == 3122 || pdg == 3222 || pdg == 31 <<
297 { <<
298 coeff = lBarCof1S; // Lambda, Sigma+, Sigm <<
299 483
300 } else if( pdg == 3322 || pdg == 3312 ) << 484 G4double test1 = -bb*t;
301 { << 485 if (test1 > expxu) test1 = expxu;
302 coeff = lBarCof2S; // Xi-, Xi0 << 486 if (test1 < expxl) test1 = expxl;
303 } << 487
304 else if( pdg == 3324) << 488 G4double test2 = -dd*t;
305 { << 489 if (test2 > expxu) test2 = expxu;
306 coeff = lBarCof3S; // Omega << 490 if (test2 < expxl) test2 = expxl;
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; <<
343 491
344 if( pdg == 321 || pdg == 311 || pdg == 310 ) << 492 return aa*std::exp(test1) + cc*std::exp(test2) - rr;
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 } 493 }
386 494
387 495
388 496