Gabriele Cosmo
131 lines
4.5 KiB
C++
131 lines
4.5 KiB
C++
//
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// ********************************************************************
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// * DISCLAIMER *
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// * *
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// * The following disclaimer summarizes all the specific disclaimers *
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// * of contributors to this software. The specific disclaimers,which *
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// * govern, are listed with their locations in: *
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// * http://cern.ch/geant4/license *
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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. *
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// * *
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// * This code implementation is the intellectual property of the *
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// * GEANT4 collaboration. *
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// * By copying, distributing or modifying the Program (or any work *
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// * based on the Program) you indicate your acceptance of this *
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// * statement, and all its terms. *
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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 "G4NucleiPropertiesTable.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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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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G4double aR=0;
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while(aR<theRadius)
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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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aR+=0.3*fermi;
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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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const G4ProtonField & G4ProtonField::operator=(const G4ProtonField &)
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{
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throw G4HadronicException(__FILE__, __LINE__, "G4ProtonField::operator= meant not to be accessible");
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return *this;
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}
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G4int G4ProtonField::operator==(const G4ProtonField &) const
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{
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throw G4HadronicException(__FILE__, __LINE__, "G4ProtonField::operator== meant not to be accessible");
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return 0;
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}
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G4int G4ProtonField::operator!=(const G4ProtonField &) const
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{
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throw G4HadronicException(__FILE__, __LINE__, "G4ProtonField::operator!= meant not to be accessible");
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return 1;
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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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G4int index = static_cast<G4int>(x/(0.3*fermi) );
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if(index+2>static_cast<G4int>(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 + std::pow(theA,1./3.));
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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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