Gabriele Cosmo
109 lines
4.3 KiB
C++
109 lines
4.3 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: G4ProtonField.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 "G4ProtonField.hh"
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#include "G4PhysicalConstants.hh"
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#include "G4SystemOfUnits.hh"
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#include "G4VNuclearDensity.hh"
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#include "G4FermiMomentum.hh"
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#include "G4V3DNucleus.hh"
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#include "G4Pow.hh"
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G4ProtonField::G4ProtonField(G4V3DNucleus * aNucleus) :
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G4VNuclearField(aNucleus), theDensity(theNucleus->GetNuclearDensity())
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{
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theA = theNucleus->GetMassNumber();
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theZ = theNucleus->GetCharge();
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theBarrier = GetBarrier();
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theRadius = 2.*theNucleus->GetOuterRadius();
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theFermi.Init(theA, theZ);
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for (G4double aR=0.;aR<theRadius; aR+=0.3*fermi)
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{
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G4ThreeVector aPosition(0,0,aR);
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G4double density = GetDensity(aPosition);
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G4double fermiMom = GetFermiMomentum(density);
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theFermiMomBuffer.push_back(fermiMom);
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}
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{
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G4ThreeVector aPosition(0,0,theRadius);
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G4double density = GetDensity(aPosition);
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G4double fermiMom = GetFermiMomentum(density);
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theFermiMomBuffer.push_back(fermiMom);
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}
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{
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G4ThreeVector aPosition(0,0,theRadius+0.001*fermi);
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theFermiMomBuffer.push_back(0);
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}
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{
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G4ThreeVector aPosition(0,0,1.*m);
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theFermiMomBuffer.push_back(0);
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}
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}
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G4ProtonField::~G4ProtonField()
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{ }
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G4double G4ProtonField::GetField(const G4ThreeVector & aPosition)
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{
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//G4cout << " Fermi Potential " << (fermiMom*fermiMom)/(2*proton_mass_c2) <<G4endl;
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G4double x = aPosition.mag();
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unsigned int index = static_cast<unsigned int>(x/(0.3*fermi));
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if((index+2) > theFermiMomBuffer.size()) return theFermiMomBuffer.back();
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G4double y1 = theFermiMomBuffer[index];
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G4double y2 = theFermiMomBuffer[index+1];
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G4double x1 = (0.3*fermi)*index;
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G4double x2 = (0.3*fermi)*(index+1);
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G4double fermiMom = y1 + (x-x1)*(y2-y1)/(x2-x1);
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G4double y = -1*(fermiMom*fermiMom)/(2*proton_mass_c2)+theBarrier;
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// G4cout <<" Protonfield test "<<index<<" "<< x1<<" "<<y1<<" "<<x2<<" "<<y2<<" "<<x<<" "<<y<<" "<<theBarrier<<G4endl;
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return y;
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}
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G4double G4ProtonField::GetBarrier()
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{
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G4double coulombBarrier = (1.44/1.14) * MeV * theZ / (1.0 + G4Pow::GetInstance()->Z13(theA));
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//GF G4double bindingEnergy = G4NucleiPropertiesTable::GetBindingEnergy(Z, A);
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G4double bindingEnergy =0;
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/*
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* G4cout << " coulombBarrier/bindingEnergy : "
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* << coulombBarrier << " /" << bindingEnergy << G4endl;
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*/
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return bindingEnergy/theA+coulombBarrier;
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}
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