#include <G4XrayRayleighModel.hh>
Inheritance diagram for G4XrayRayleighModel:
Public Member Functions | |
| G4XrayRayleighModel (const G4ParticleDefinition *p=0, const G4String &nam="XrayRayleigh") | |
| virtual | ~G4XrayRayleighModel () |
| virtual void | Initialise (const G4ParticleDefinition *, const G4DataVector &) |
| virtual G4double | ComputeCrossSectionPerAtom (const G4ParticleDefinition *, G4double kinEnergy, G4double Z, G4double A=0, G4double cut=0, G4double emax=DBL_MAX) |
| virtual void | SampleSecondaries (std::vector< G4DynamicParticle * > *, const G4MaterialCutsCouple *, const G4DynamicParticle *, G4double tmin, G4double maxEnergy) |
Protected Attributes | |
| G4ParticleChangeForGamma * | fParticleChange |
Definition at line 42 of file G4XrayRayleighModel.hh.
| G4XrayRayleighModel::G4XrayRayleighModel | ( | const G4ParticleDefinition * | p = 0, |
|
| const G4String & | nam = "XrayRayleigh" | |||
| ) |
Definition at line 49 of file G4XrayRayleighModel.cc.
References fParticleChange, G4cout, G4endl, and G4VEmModel::SetHighEnergyLimit().
00051 :G4VEmModel(nam),isInitialised(false) 00052 { 00053 fParticleChange = 0; 00054 lowEnergyLimit = 250*eV; 00055 highEnergyLimit = 10.*MeV; 00056 fFormFactor = 0.0; 00057 00058 // SetLowEnergyLimit(lowEnergyLimit); 00059 SetHighEnergyLimit(highEnergyLimit); 00060 // 00061 verboseLevel= 0; 00062 // Verbosity scale: 00063 // 0 = nothing 00064 // 1 = warning for energy non-conservation 00065 // 2 = details of energy budget 00066 // 3 = calculation of cross sections, file openings, sampling of atoms 00067 // 4 = entering in methods 00068 00069 if(verboseLevel > 0) 00070 { 00071 G4cout << "Xray Rayleigh is constructed " << G4endl 00072 << "Energy range: " 00073 << lowEnergyLimit / eV << " eV - " 00074 << highEnergyLimit / MeV << " MeV" 00075 << G4endl; 00076 } 00077 }
| G4XrayRayleighModel::~G4XrayRayleighModel | ( | ) | [virtual] |
| G4double G4XrayRayleighModel::ComputeCrossSectionPerAtom | ( | const G4ParticleDefinition * | , | |
| G4double | kinEnergy, | |||
| G4double | Z, | |||
| G4double | A = 0, |
|||
| G4double | cut = 0, |
|||
| G4double | emax = DBL_MAX | |||
| ) | [virtual] |
Reimplemented from G4VEmModel.
Definition at line 107 of file G4XrayRayleighModel.cc.
References G4InuclParticleNames::alpha, G4cout, and G4endl.
00112 { 00113 if (verboseLevel > 3) 00114 { 00115 G4cout << "Calling CrossSectionPerAtom() of G4XrayRayleighModel" << G4endl; 00116 } 00117 if (gammaEnergy < lowEnergyLimit || gammaEnergy > highEnergyLimit) 00118 { 00119 return 0.0; 00120 } 00121 G4double k = gammaEnergy/hbarc; 00122 k *= Bohr_radius; 00123 G4double p0 = 0.680654; 00124 G4double p1 = -0.0224188; 00125 G4double lnZ = std::log(Z); 00126 00127 G4double lna = p0 + p1*lnZ; 00128 00129 G4double alpha = std::exp(lna); 00130 00131 G4double fo = std::pow(k, alpha); 00132 00133 p0 = 3.68455; 00134 p1 = -0.464806; 00135 lna = p0 + p1*lnZ; 00136 00137 fo *= 0.01*std::exp(lna); 00138 00139 fFormFactor = fo; 00140 00141 G4double b = 1. + 2.*fo; 00142 G4double b2 = b*b; 00143 G4double b3 = b*b2; 00144 00145 G4double xsc = fCofR*Z*Z/b3; 00146 xsc *= fo*fo + (1. + fo)*(1. + fo); 00147 00148 00149 return xsc; 00150 00151 }
| void G4XrayRayleighModel::Initialise | ( | const G4ParticleDefinition * | , | |
| const G4DataVector & | ||||
| ) | [virtual] |
Implements G4VEmModel.
Definition at line 88 of file G4XrayRayleighModel.cc.
References fParticleChange, G4cout, G4endl, G4VEmModel::GetParticleChangeForGamma(), and G4VEmModel::InitialiseElementSelectors().
00090 { 00091 if (verboseLevel > 3) 00092 { 00093 G4cout << "Calling G4XrayRayleighModel::Initialise()" << G4endl; 00094 } 00095 00096 InitialiseElementSelectors(particle,cuts); 00097 00098 00099 if(isInitialised) return; 00100 fParticleChange = GetParticleChangeForGamma(); 00101 isInitialised = true; 00102 00103 }
| void G4XrayRayleighModel::SampleSecondaries | ( | std::vector< G4DynamicParticle * > * | , | |
| const G4MaterialCutsCouple * | , | |||
| const G4DynamicParticle * | , | |||
| G4double | tmin, | |||
| G4double | maxEnergy | |||
| ) | [virtual] |
Implements G4VEmModel.
Definition at line 155 of file G4XrayRayleighModel.cc.
References G4InuclParticleNames::alpha, fParticleChange, G4cout, G4endl, G4UniformRand, G4DynamicParticle::GetKineticEnergy(), G4DynamicParticle::GetMomentumDirection(), G4DynamicParticle::GetParticleDefinition(), G4Element::GetZ(), G4INCL::Math::pi, G4ParticleChangeForGamma::ProposeMomentumDirection(), G4VEmModel::SelectRandomAtom(), and G4ParticleChangeForGamma::SetProposedKineticEnergy().
00160 { 00161 if ( verboseLevel > 3) 00162 { 00163 G4cout << "Calling SampleSecondaries() of G4XrayRayleighModel" << G4endl; 00164 } 00165 G4double photonEnergy0 = aDynamicGamma->GetKineticEnergy(); 00166 00167 G4ParticleMomentum photonDirection0 = aDynamicGamma->GetMomentumDirection(); 00168 00169 00170 // Sample the angle of the scattered photon 00171 // according to 1 + cosTheta*cosTheta distribution 00172 00173 G4double cosDipole, cosTheta, sinTheta; 00174 G4double c, delta, cofA, signc = 1., a, power = 1./3.; 00175 00176 c = 4. - 8.*G4UniformRand(); 00177 a = c; 00178 00179 if( c < 0. ) 00180 { 00181 signc = -1.; 00182 a = -c; 00183 } 00184 delta = std::sqrt(a*a+4.); 00185 delta += a; 00186 delta *= 0.5; 00187 cofA = -signc*std::pow(delta, power); 00188 cosDipole = cofA - 1./cofA; 00189 00190 // select atom 00191 const G4Element* elm = SelectRandomAtom(couple, aDynamicGamma->GetParticleDefinition(), photonEnergy0); 00192 G4double Z = elm->GetZ(); 00193 00194 G4double k = photonEnergy0/hbarc; 00195 k *= Bohr_radius; 00196 G4double p0 = 0.680654; 00197 G4double p1 = -0.0224188; 00198 G4double lnZ = std::log(Z); 00199 00200 G4double lna = p0 + p1*lnZ; 00201 00202 G4double alpha = std::exp(lna); 00203 00204 G4double fo = std::pow(k, alpha); 00205 00206 p0 = 3.68455; 00207 p1 = -0.464806; 00208 lna = p0 + p1*lnZ; 00209 00210 fo *= 0.01*pi*std::exp(lna); 00211 00212 00213 G4double beta = fo/(1 + fo); 00214 00215 cosTheta = (cosDipole + beta)/(1. + cosDipole*beta); 00216 00217 00218 if( cosTheta > 1.) cosTheta = 1.; 00219 if( cosTheta < -1.) cosTheta = -1.; 00220 00221 sinTheta = std::sqrt( (1. - cosTheta)*(1. + cosTheta) ); 00222 00223 // Scattered photon angles. ( Z - axis along the parent photon) 00224 00225 G4double phi = twopi * G4UniformRand() ; 00226 G4double dirX = sinTheta*std::cos(phi); 00227 G4double dirY = sinTheta*std::sin(phi); 00228 G4double dirZ = cosTheta; 00229 00230 // Update G4VParticleChange for the scattered photon 00231 00232 G4ThreeVector photonDirection1(dirX, dirY, dirZ); 00233 photonDirection1.rotateUz(photonDirection0); 00234 fParticleChange->ProposeMomentumDirection(photonDirection1); 00235 00236 fParticleChange->SetProposedKineticEnergy(photonEnergy0); 00237 }
Definition at line 70 of file G4XrayRayleighModel.hh.
Referenced by G4XrayRayleighModel(), Initialise(), and SampleSecondaries().
1.4.7