Gabriele Cosmo
118 lines
4.1 KiB
C++
118 lines
4.1 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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// $Id: G4eeToTwoPiModel.cc,v 1.6 2008/07/10 18:06:39 vnivanch Exp $
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// GEANT4 tag $Name: geant4-09-02 $
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//
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// -------------------------------------------------------------------
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//
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// GEANT4 Class header file
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//
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//
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// File name: G4eeToTwoPiModel
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//
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// Author: Vladimir Ivanchenko
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//
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// Creation date: 25.10.2003
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//
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// Modifications:
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//
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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 "G4eeToTwoPiModel.hh"
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#include "Randomize.hh"
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#include "G4PionPlus.hh"
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#include "G4PionMinus.hh"
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#include "G4DynamicParticle.hh"
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#include "G4PhysicsVector.hh"
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#include "G4PhysicsLinearVector.hh"
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#include "G4eeCrossSections.hh"
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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using namespace std;
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G4eeToTwoPiModel::G4eeToTwoPiModel(G4eeCrossSections* cr):
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cross(cr)
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{
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massPi = G4PionPlus::PionPlus()->GetPDGMass();
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massRho = 775.5*MeV;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4eeToTwoPiModel::~G4eeToTwoPiModel()
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{}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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G4PhysicsVector* G4eeToTwoPiModel::PhysicsVector(G4double emin,
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G4double emax) const
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{
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G4double tmin = std::max(emin, 2.0*massPi);
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G4double tmax = std::max(tmin, emax);
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G4int nbins = (G4int)((tmax - tmin)/(5.*MeV));
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G4PhysicsVector* v = new G4PhysicsLinearVector(emin,emax,nbins);
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v->SetSpline(true);
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return v;
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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void G4eeToTwoPiModel::SampleSecondaries(std::vector<G4DynamicParticle*>* newp,
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G4double e, const G4ThreeVector& direction)
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{
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G4double tkin = 0.5*e - massPi;
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if(tkin < 0.0) tkin = 0.0;
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G4double cost;
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do {
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cost = 2.0*G4UniformRand() - 1.0;
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} while( G4UniformRand() > 1.0 - cost*cost );
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G4double sint = sqrt(1.0 - cost*cost);
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G4double phi = twopi * G4UniformRand();
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G4ThreeVector dir(sint*cos(phi),sint*sin(phi), cost);
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dir.rotateUz(direction);
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// create G4DynamicParticle objects
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G4DynamicParticle* pip =
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new G4DynamicParticle(G4PionPlus::PionPlus(),dir,tkin);
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G4DynamicParticle* pin =
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new G4DynamicParticle(G4PionMinus::PionMinus(),-dir,tkin);
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newp->push_back(pip);
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newp->push_back(pin);
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}
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//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
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