Gabriele Cosmo
102 lines
3.7 KiB
C++
102 lines
3.7 KiB
C++
//
|
|
// ********************************************************************
|
|
// * License and Disclaimer *
|
|
// * *
|
|
// * The Geant4 software is copyright of the Copyright Holders of *
|
|
// * the Geant4 Collaboration. It is provided under the terms and *
|
|
// * conditions of the Geant4 Software License, included in the file *
|
|
// * LICENSE and available at http://cern.ch/geant4/license . These *
|
|
// * include a list of copyright holders. *
|
|
// * *
|
|
// * Neither the authors of this software system, nor their employing *
|
|
// * institutes,nor the agencies providing financial support for this *
|
|
// * work make any representation or warranty, express or implied, *
|
|
// * regarding this software system or assume any liability for its *
|
|
// * use. Please see the license in the file LICENSE and URL above *
|
|
// * for the full disclaimer and the limitation of liability. *
|
|
// * *
|
|
// * This code implementation is the result of the scientific and *
|
|
// * technical work of the GEANT4 collaboration. *
|
|
// * By using, copying, modifying or distributing the software (or *
|
|
// * any work based on the software) you agree to acknowledge its *
|
|
// * use in resulting scientific publications, and indicate your *
|
|
// * acceptance of all terms of the Geant4 Software license. *
|
|
// ********************************************************************
|
|
//
|
|
//
|
|
// -------------------------------------------------------------------
|
|
// GEANT 4 class implementation file
|
|
//
|
|
// CERN, Geneva, Switzerland
|
|
//
|
|
// File name: G4PionZeroField.cc
|
|
//
|
|
// Author: Alessandro Brunengo (Alessandro.Brunengo@ge.infn.it)
|
|
//
|
|
// Creation date: 5 June 2000
|
|
// -------------------------------------------------------------------
|
|
#include "G4PionZeroField.hh"
|
|
#include "G4NucleiProperties.hh"
|
|
#include "G4VNuclearDensity.hh"
|
|
#include "G4FermiMomentum.hh"
|
|
#include "G4PionZero.hh"
|
|
#include "G4HadTmpUtil.hh"
|
|
|
|
|
|
G4PionZeroField::G4PionZeroField(G4V3DNucleus * nucleus, G4double coeff)
|
|
: G4VNuclearField(nucleus)
|
|
{
|
|
theCoeff = coeff;
|
|
}
|
|
|
|
|
|
G4PionZeroField::~G4PionZeroField()
|
|
{ }
|
|
|
|
|
|
const G4PionZeroField & G4PionZeroField::operator=(const G4PionZeroField &)
|
|
{
|
|
throw G4HadronicException(__FILE__, __LINE__, "G4PionZeroField::operator= meant not to be accessible");
|
|
return *this;
|
|
}
|
|
|
|
|
|
G4int G4PionZeroField::operator==(const G4PionZeroField &) const
|
|
{
|
|
throw G4HadronicException(__FILE__, __LINE__, "G4PionZeroField::operator== meant not to be accessible");
|
|
return 0;
|
|
}
|
|
|
|
|
|
G4int G4PionZeroField::operator!=(const G4PionZeroField &) const
|
|
{
|
|
throw G4HadronicException(__FILE__, __LINE__, "G4PionZeroField::operator!= meant not to be accessible");
|
|
return 1;
|
|
}
|
|
|
|
|
|
G4double G4PionZeroField::GetField(const G4ThreeVector & aPosition)
|
|
{
|
|
// Field is 0 out of the nucleus!
|
|
if(aPosition.mag() >= radius) return 0.0;
|
|
|
|
G4double pionZeroMass = G4PionZero::PionZero()->GetPDGMass();
|
|
G4double A = theNucleus->GetMassNumber();
|
|
G4double Z = theNucleus->GetCharge();
|
|
|
|
G4double bindingEnergy = G4NucleiProperties::GetBindingEnergy(G4lrint(A), G4lrint(Z));
|
|
G4double nucleusMass = Z*proton_mass_c2+(A-Z)*neutron_mass_c2+bindingEnergy;
|
|
G4double reducedMass = pionZeroMass*nucleusMass/(pionZeroMass+nucleusMass);
|
|
|
|
|
|
G4double density = A*theNucleus->GetNuclearDensity()->GetDensity(aPosition);
|
|
G4double nucleonMass = (proton_mass_c2+neutron_mass_c2)/2;
|
|
|
|
return 2.*pi*hbarc*hbarc/reducedMass*(1+pionZeroMass/nucleonMass)*theCoeff*density;
|
|
}
|
|
|
|
G4double G4PionZeroField::GetBarrier()
|
|
{
|
|
return 0;
|
|
}
|