Gabriele Cosmo
129 lines
4.1 KiB
C++
129 lines
4.1 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: G4NeutronField.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 "G4NeutronField.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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G4NeutronField::G4NeutronField(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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theFermi.Init(theA, theZ);
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theR = 2.*theNucleus->GetOuterRadius();
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G4double aR=0;
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while(aR<theR)
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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,theR);
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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,theR+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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G4NeutronField::~G4NeutronField()
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{ }
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const G4NeutronField & G4NeutronField::operator=(const G4NeutronField &)
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{
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throw G4HadronicException(__FILE__, __LINE__, "G4NeutronField::operator= meant not to be accessible");
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return *this;
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}
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G4int G4NeutronField::operator==(const G4NeutronField &) const
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{
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throw G4HadronicException(__FILE__, __LINE__, "G4NeutronField::operator== meant not to be accessible");
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return 0;
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}
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G4int G4NeutronField::operator!=(const G4NeutronField &) const
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{
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throw G4HadronicException(__FILE__, __LINE__, "G4NeutronField::operator!= meant not to be accessible");
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return 1;
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}
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G4double G4NeutronField::GetField(const G4ThreeVector & aPosition)
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{
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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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return -1*(fermiMom*fermiMom)/(2*neutron_mass_c2);
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}
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G4double G4NeutronField::GetBarrier()
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{
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/*
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* G4double A = theNucleus->GetMassNumber();
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* G4double Z = theNucleus->GetCharge();
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*
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* return G4NucleiPropertiesTable::GetBindingEnergy(Z, A)/A;
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*/
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return 0.;
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}
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