Gabriele Cosmo
114 lines
3.7 KiB
C++
114 lines
3.7 KiB
C++
//
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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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//
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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: G4DNARuddAngle
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//
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// Author: Vladimir Ivantcheko
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//
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// Creation date: 23 August 2013
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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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// Delta-electron Angular Distribution Generation
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//
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// Class Description: End
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//
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// -------------------------------------------------------------------
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//
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#include "G4DNARuddAngle.hh"
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#include "G4PhysicalConstants.hh"
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#include "Randomize.hh"
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#include "G4ParticleDefinition.hh"
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#include "G4Electron.hh"
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#include "G4SystemOfUnits.hh"
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using namespace std;
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G4DNARuddAngle::G4DNARuddAngle(const G4String&)
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: G4VEmAngularDistribution("deltaRudd")
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{
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fElectron = G4Electron::Electron();
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}
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G4DNARuddAngle::~G4DNARuddAngle()
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{}
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G4ThreeVector&
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G4DNARuddAngle::SampleDirectionForShell(const G4DynamicParticle* dp,
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G4double secKinetic, G4int,
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G4int,
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const G4Material*)
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{
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G4double k = dp->GetKineticEnergy();
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G4double cosTheta = 1.0;
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const G4ParticleDefinition* particle = dp->GetDefinition();
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G4double mass = particle->GetPDGMass();
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G4double maximumEnergyTransfer = k;
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if(particle == fElectron) { maximumEnergyTransfer *= 0.5; }
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else if(mass > MeV) {
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G4double ratio = electron_mass_c2/mass;
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G4double tau = k/mass;
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maximumEnergyTransfer = 2.0*electron_mass_c2*tau*(tau + 2.) /
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(1. + 2.0*(tau + 1.)*ratio + ratio*ratio);
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}
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if (secKinetic>100*eV && secKinetic <= maximumEnergyTransfer) {
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cosTheta = std::sqrt(secKinetic / maximumEnergyTransfer);
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} else {
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cosTheta = (2.*G4UniformRand())-1.;
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}
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G4double sint = sqrt((1.0 - cosTheta)*(1.0 + cosTheta));
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G4double phi = twopi*G4UniformRand();
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fLocalDirection.set(sint*cos(phi), sint*sin(phi), cosTheta);
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fLocalDirection.rotateUz(dp->GetMomentumDirection());
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return fLocalDirection;
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}
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G4ThreeVector&
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G4DNARuddAngle::SampleDirection(const G4DynamicParticle* dp,
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G4double secEkin, G4int Z,
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const G4Material* mat)
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{
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return SampleDirectionForShell(dp, secEkin, Z, 0, mat);
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}
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void G4DNARuddAngle::PrintGeneratorInformation() const
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{}
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