Gabriele Cosmo
119 lines
3.9 KiB
C++
119 lines
3.9 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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// GEANT 4 class implementation file
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//
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// CERN, Geneva, Switzerland
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//
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// File name: G4PionMinusField.cc
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//
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// Author: Alessandro Brunengo (Alessandro.Brunengo@ge.infn.it)
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//
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// Creation date: 5 June 2000
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// -------------------------------------------------------------------
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#include "G4PionMinusField.hh"
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#include "G4NucleiProperties.hh"
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#include "G4VNuclearDensity.hh"
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#include "G4FermiMomentum.hh"
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#include "G4PionMinus.hh"
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#include "G4HadTmpUtil.hh"
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G4PionMinusField::G4PionMinusField(G4V3DNucleus * nucleus, G4double coeff)
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: G4VNuclearField(nucleus)
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{
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theCoeff = coeff;
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}
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G4PionMinusField::~G4PionMinusField()
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{ }
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const G4PionMinusField & G4PionMinusField::operator=(const G4PionMinusField &)
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{
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throw G4HadronicException(__FILE__, __LINE__, "G4PionMinusField::operator= meant not to be accessible");
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return *this;
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}
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G4int G4PionMinusField::operator==(const G4PionMinusField &) const
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{
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throw G4HadronicException(__FILE__, __LINE__, "G4PionMinusField::operator== meant not to be accessible");
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return 0;
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}
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G4int G4PionMinusField::operator!=(const G4PionMinusField &) const
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{
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throw G4HadronicException(__FILE__, __LINE__, "G4PionMinusField::operator!= meant not to be accessible");
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return 1;
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}
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G4double G4PionMinusField::GetField(const G4ThreeVector & aPosition)
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{
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// Field is 0 out of the nucleus!
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if(aPosition.mag() >= radius) return 0.0;
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G4int A = theNucleus->GetMassNumber();
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G4int Z = theNucleus->GetCharge();
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G4double pionMinusMass = G4PionMinus::PionMinus()->GetPDGMass();
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G4double bindingEnergy = G4NucleiProperties::GetBindingEnergy(G4lrint(A), G4lrint(Z));
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G4double nucleusMass = Z*proton_mass_c2+(A-Z)*neutron_mass_c2+bindingEnergy;
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G4double reducedMass = pionMinusMass*nucleusMass/(pionMinusMass+nucleusMass);
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G4double density = A*theNucleus->GetNuclearDensity()->GetDensity(aPosition);
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G4double nucleonMass = (proton_mass_c2+neutron_mass_c2)/2;
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return 2.*pi*hbarc*hbarc/reducedMass*(1+pionMinusMass/nucleonMass)*theCoeff*density + GetBarrier();
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}
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G4double G4PionMinusField::GetBarrier()
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{
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G4int A = theNucleus->GetMassNumber();
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G4int Z = theNucleus->GetCharge();
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G4double coulombBarrier = (1.44/1.14) * MeV * Z / (1.0 + std::pow(A,1./3.));
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return -coulombBarrier;
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}
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