| 1 | //
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| 2 | // ********************************************************************
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| 3 | // * License and Disclaimer *
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| 4 | // * *
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of *
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and *
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| 7 | // * conditions of the Geant4 Software License, included in the file *
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These *
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| 9 | // * include a list of copyright holders. *
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| 10 | // * *
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| 11 | // * Neither the authors of this software system, nor their employing *
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| 12 | // * institutes,nor the agencies providing financial support for this *
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| 13 | // * work make any representation or warranty, express or implied, *
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| 14 | // * regarding this software system or assume any liability for its *
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| 15 | // * use. Please see the license in the file LICENSE and URL above *
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| 16 | // * for the full disclaimer and the limitation of liability. *
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| 17 | // * *
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| 18 | // * This code implementation is the result of the scientific and *
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| 19 | // * technical work of the GEANT4 collaboration. *
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| 20 | // * By using, copying, modifying or distributing the software (or *
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| 21 | // * any work based on the software) you agree to acknowledge its *
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| 22 | // * use in resulting scientific publications, and indicate your *
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| 23 | // * acceptance of all terms of the Geant4 Software license. *
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| 24 | // ********************************************************************
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| 25 | //
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| 26 | //
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| 27 | // -------------------------------------------------------------------
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| 28 | // GEANT 4 class implementation file
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| 29 | //
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| 30 | // CERN, Geneva, Switzerland
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| 31 | //
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| 32 | // File name: G4NeutronField.cc
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| 33 | //
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| 34 | // Author: Alessandro Brunengo (Alessandro.Brunengo@ge.infn.it)
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| 35 | //
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| 36 | // Creation date: 5 June 2000
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| 37 | // -------------------------------------------------------------------
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| 38 | #include "G4NeutronField.hh"
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| 39 | #include "G4NucleiPropertiesTable.hh"
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| 40 | #include "G4VNuclearDensity.hh"
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| 41 | #include "G4FermiMomentum.hh"
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| 42 |
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| 43 |
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| 44 | G4NeutronField::G4NeutronField(G4V3DNucleus * aNucleus) :
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| 45 | G4VNuclearField(aNucleus), theDensity(theNucleus->GetNuclearDensity())
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| 46 | {
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| 47 | theA = theNucleus->GetMassNumber();
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| 48 | theZ = theNucleus->GetCharge();
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| 49 | theFermi.Init(theA, theZ);
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| 50 | theR = 2.*theNucleus->GetOuterRadius();
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| 51 | G4double aR=0;
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| 52 | while(aR<theR)
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| 53 | {
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| 54 | G4ThreeVector aPosition(0,0,aR);
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| 55 | G4double density = GetDensity(aPosition);
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| 56 | G4double fermiMom = GetFermiMomentum(density);
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| 57 | theFermiMomBuffer.push_back(fermiMom);
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| 58 | aR+=0.3*fermi;
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| 59 | }
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| 60 | {
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| 61 | G4ThreeVector aPosition(0,0,theR);
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| 62 | G4double density = GetDensity(aPosition);
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| 63 | G4double fermiMom = GetFermiMomentum(density);
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| 64 | theFermiMomBuffer.push_back(fermiMom);
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| 65 | }
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| 66 | {
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| 67 | G4ThreeVector aPosition(0,0,theR+0.001*fermi);
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| 68 | theFermiMomBuffer.push_back(0);
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| 69 | }
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| 70 | {
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| 71 | G4ThreeVector aPosition(0,0,1.*m);
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| 72 | theFermiMomBuffer.push_back(0);
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| 73 | }
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| 74 | }
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| 75 |
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| 76 | G4NeutronField::~G4NeutronField()
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| 77 | { }
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| 78 |
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| 79 |
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| 80 | const G4NeutronField & G4NeutronField::operator=(const G4NeutronField &)
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| 81 | {
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| 82 | throw G4HadronicException(__FILE__, __LINE__, "G4NeutronField::operator= meant not to be accessible");
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| 83 | return *this;
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| 84 | }
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| 85 |
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| 86 |
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| 87 | G4int G4NeutronField::operator==(const G4NeutronField &) const
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| 88 | {
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| 89 | throw G4HadronicException(__FILE__, __LINE__, "G4NeutronField::operator== meant not to be accessible");
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| 90 | return 0;
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| 91 | }
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| 92 |
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| 93 |
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| 94 | G4int G4NeutronField::operator!=(const G4NeutronField &) const
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| 95 | {
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| 96 | throw G4HadronicException(__FILE__, __LINE__, "G4NeutronField::operator!= meant not to be accessible");
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| 97 | return 1;
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| 98 | }
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| 99 |
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| 100 |
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| 101 | G4double G4NeutronField::GetField(const G4ThreeVector & aPosition)
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| 102 | {
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| 103 | G4double x = aPosition.mag();
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| 104 | G4int index = static_cast<G4int>(x/(0.3*fermi) );
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| 105 | if(index+2> static_cast<G4int>(theFermiMomBuffer.size())) return theFermiMomBuffer.back();
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| 106 | G4double y1 = theFermiMomBuffer[index];
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| 107 | G4double y2 = theFermiMomBuffer[index+1];
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| 108 | G4double x1 = (0.3*fermi)*index;
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| 109 | G4double x2 = (0.3*fermi)*(index+1);
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| 110 | G4double fermiMom = y1 + (x-x1)*(y2-y1)/(x2-x1);
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| 111 | return -1*(fermiMom*fermiMom)/(2*neutron_mass_c2);
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| 112 | }
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| 113 |
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| 114 |
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| 115 |
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| 116 | G4double G4NeutronField::GetBarrier()
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| 117 | {
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| 118 | /*
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| 119 | * G4double A = theNucleus->GetMassNumber();
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| 120 | * G4double Z = theNucleus->GetCharge();
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| 121 | *
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| 122 | * return G4NucleiPropertiesTable::GetBindingEnergy(Z, A)/A;
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| 123 | */
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| 124 | return 0.;
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| 125 | }
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| 126 |
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| 127 |
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| 128 |
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| 129 |
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| 130 |
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| 131 |
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