Import Geant4 8.1.0 source tree
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Gabriele Cosmo
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//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// $Id: G4CoulombScatteringModel.cc,v 1.2 2006/06/29 19:52:54 gunter Exp $
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// GEANT4 tag $Name: geant4-08-01 $
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//
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// -------------------------------------------------------------------
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//
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// GEANT4 Class file
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//
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//
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// File name: G4CoulombScatteringModel
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//
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// Author: Vladimir Ivanchenko
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//
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// Creation date: 22.08.2005
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//
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// Modifications:
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//
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// Class Description:
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//
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// -------------------------------------------------------------------
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//
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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#include "G4CoulombScatteringModel.hh"
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#include "Randomize.hh"
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#include "G4DataVector.hh"
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#include "G4PhysicsLogVector.hh"
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#include "G4ParticleChangeForGamma.hh"
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#include "G4NistManager.hh"
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#include "G4ParticleTable.hh"
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#include "G4IonTable.hh"
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#include "G4Proton.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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using namespace std;
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G4CoulombScatteringModel::G4CoulombScatteringModel(
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G4double thetaMin, G4double thetaMax, G4bool build,
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G4double tlim, const G4String& nam)
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: G4VEmModel(nam),
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theCrossSectionTable(0),
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cosThetaMin(cos(thetaMin)),
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cosThetaMax(cos(thetaMax)),
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lowMomentum(keV),
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highMomentum(MeV),
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q2Limit(tlim),
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nbins(12),
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nmax(100),
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buildTable(build),
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isInitialised(false)
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{
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G4double p0 = hbarc/(Bohr_radius*0.885);
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a0 = 0.25*p0*p0;
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p0 = electron_mass_c2*classic_electr_radius;
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coeff = twopi*p0*p0;
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theMatManager = G4NistManager::Instance();
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theParticleTable = G4ParticleTable::GetParticleTable();
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theProton = G4Proton::Proton();
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4CoulombScatteringModel::~G4CoulombScatteringModel()
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{
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if(theCrossSectionTable) {
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theCrossSectionTable->clearAndDestroy();
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delete theCrossSectionTable;
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4CoulombScatteringModel::Initialise(const G4ParticleDefinition* p,
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const G4DataVector&)
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{
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if(isInitialised) return;
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isInitialised = true;
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if(pParticleChange)
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fParticleChange = reinterpret_cast<G4ParticleChangeForGamma*>(pParticleChange);
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else
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fParticleChange = new G4ParticleChangeForGamma();
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if(!buildTable || p->GetParticleName() == "GenericIon") return;
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// Compute cross section multiplied by Ptot^2*beta^2
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G4double mass = p->GetPDGMass();
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G4double mass2 = mass*mass;
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theCrossSectionTable = new G4PhysicsTable(nmax);
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G4PhysicsLogVector* ptrVector;
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G4double mom2, value;
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G4double pmin = lowMomentum*lowMomentum;
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G4double pmax = highMomentum*highMomentum;
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nbins = G4int(log10(pmax/pmin)/2.0) + 1;
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for(G4int j=1; j<nmax; j++) {
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ptrVector = new G4PhysicsLogVector(pmin, pmax, nbins);
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for(G4int i=0; i<=nbins; i++) {
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mom2 = ptrVector->GetLowEdgeEnergy( i ) ;
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value = CalculateCrossSectionPerAtom(p, mom2, j);
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value *= mom2*mom2/(mom2 + mass2);
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ptrVector->PutValue( i, value );
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}
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theCrossSectionTable->insert(ptrVector);
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}
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4CoulombScatteringModel::CalculateCrossSectionPerAtom(
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const G4ParticleDefinition* p,
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G4double mom2,
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G4double Z)
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{
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G4double cross= 0.0;
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G4int iz = G4int(Z);
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G4double m = p->GetPDGMass();
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G4double mass2= m*m;
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G4double q = p->GetPDGCharge()/eplus;
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G4double m1 = theMatManager->GetAtomicMassAmu(iz)*amu_c2;
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G4double etot = sqrt(mom2 + mass2) + m1;
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G4double ptot = sqrt(mom2);
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G4double bet = ptot/etot;
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G4double gam = 1.0/sqrt((1.0 - bet)*(1.0 + bet));
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G4double mom = gam*(ptot - bet*etot);
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G4double momentum2 = mom*mom;
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G4double costm = std::max(cosThetaMax, 1.0 - q2Limit/2.0*momentum2);
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if(1 == iz && p == theProton) costm = std::max(0.0, costm);
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// Cross section in CM system
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if(costm < cosThetaMin) {
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G4double invbeta2 = 1.0 + mass2/momentum2;
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G4double a = 2.0*pow(Z,0.666666667)*a0*
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(1.13 + 3.76*invbeta2*Z*Z*fine_structure_const*fine_structure_const)/momentum2 + 1.0;
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G4double f = q * Z * m1 /(m + m1);
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cross = coeff*f*f*(cosThetaMin - costm)/((a - cosThetaMin)*(a - costm));
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}
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//G4cout << "p= " << mom << " Z= " << Z << " a= " << a
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//<< " cross= " << cross << " m1(GeV)= " << m1/GeV <<G4endl;
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return cross;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4double G4CoulombScatteringModel::SelectIsotope(const G4Element* elm)
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{
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G4double N = elm->GetN();
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G4int ni = elm->GetNumberOfIsotopes();
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if(ni > 0) {
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G4double* ab = elm->GetRelativeAbundanceVector();
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G4double x = G4UniformRand();
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G4int idx;
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for(idx=0; idx<ni; idx++) {
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x -= ab[idx];
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if (x <= 0.0) break;
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}
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if(idx >= ni) {
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G4cout << "G4CoulombScatteringModel::SelectIsotope WARNING: abandance vector for"
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<< elm->GetName() << " is not normalised to unit" << G4endl;
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} else {
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N = G4double(elm->GetIsotope(idx)->GetN());
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}
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}
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return N;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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std::vector<G4DynamicParticle*>* G4CoulombScatteringModel::SampleSecondaries(
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const G4MaterialCutsCouple* couple,
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const G4DynamicParticle* dp,
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G4double,
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G4double)
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{
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std::vector<G4DynamicParticle*>* fvect = 0;
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const G4Material* aMaterial = couple->GetMaterial();
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const G4ParticleDefinition* p = dp->GetDefinition();
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const G4Element* elm = SelectRandomAtom(aMaterial, p, dp->GetKineticEnergy());
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G4double Z = elm->GetZ();
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G4double N = SelectIsotope(elm);
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G4int iz = G4int(Z);
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G4int in = G4int(N + 0.5);
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G4double m2 = theParticleTable->GetIonTable()->GetNucleusMass(iz, in);
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G4double m1 = dp->GetMass();
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// Transformation to CM system
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G4LorentzVector lv1 = dp->Get4Momentum();
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G4LorentzVector lv2(0.0,0.0,0.0,m2);
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G4LorentzVector lv = lv1 + lv2;
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G4ThreeVector bst = lv.boostVector();
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lv1.boost(-bst);
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lv2.boost(-bst);
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G4ThreeVector p1 = lv1.vect();
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G4double momentum2 = p1.mag2();
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G4double invbeta2 = 1.0 + m1*m1/momentum2;
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G4double a = 2.*pow(Z,0.666666667)*a0*
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(1.13 + 3.76*invbeta2*Z*Z*fine_structure_const*fine_structure_const)/momentum2 + 1.0;
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G4double costm = std::max(cosThetaMax, 1.0 - q2Limit/2.0*momentum2);
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if(1 == iz && p == theProton) costm = std::max(0.0, costm);
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if(costm > cosThetaMin) return fvect;
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G4double cost = a - (a - cosThetaMin)*(a - costm)/
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(a - cosThetaMin + G4UniformRand()*(cosThetaMin - costm));
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if(std::abs(cost) > 1.) {
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G4cout << "G4CoulombScatteringModel::SampleSecondaries WARNING cost= " << cost << G4endl;
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if(cost < -1.) cost = -1.0;
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else cost = 1.0;
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}
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G4double sint = sqrt((1.0 + cost)*(1.0 - cost));
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G4double phi = twopi * G4UniformRand();
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G4ThreeVector v1(cos(phi)*sint,sin(phi)*sint,cost);
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G4double p1tot = sqrt(momentum2);
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v1.rotateUz(p1);
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G4LorentzVector lfv1(v1.x()*p1tot,v1.y()*p1tot,v1.z(),lv1.e());
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G4LorentzVector lfv2 = lv1 + lv2 - lfv1;
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lfv1.boost(bst);
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lfv2.boost(bst);
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fParticleChange->ProposeMomentumDirection(lfv1.vect().unit());
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G4double ekin = lfv1.e() - m1;
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if(ekin < 0.0) ekin = 0.0;
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fParticleChange->SetProposedKineticEnergy(ekin);
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ekin = lfv2.e() - m2;
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if(ekin > Z*aMaterial->GetIonisation()->GetMeanExcitationEnergy()) {
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fvect = new std::vector<G4DynamicParticle*>;
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G4ParticleDefinition* ion = theParticleTable->GetIon(iz, in, 0.0);
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G4DynamicParticle* newdp = new G4DynamicParticle(ion, lfv2);
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fvect->push_back(newdp);
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}
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return fvect;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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