[819] | 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: G4PionZeroField.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 "G4PionZeroField.hh" |
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[962] | 39 | #include "G4NucleiProperties.hh" |
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[819] | 40 | #include "G4VNuclearDensity.hh" |
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| 41 | #include "G4FermiMomentum.hh" |
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| 42 | #include "G4PionZero.hh" |
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| 43 | #include "G4HadTmpUtil.hh" |
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| 44 | |
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| 45 | |
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| 46 | G4PionZeroField::G4PionZeroField(G4V3DNucleus * nucleus, G4double coeff) |
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| 47 | : G4VNuclearField(nucleus) |
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| 48 | { |
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| 49 | theCoeff = coeff; |
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| 50 | } |
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| 51 | |
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| 52 | |
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| 53 | G4PionZeroField::~G4PionZeroField() |
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| 54 | { } |
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| 55 | |
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| 56 | |
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| 57 | const G4PionZeroField & G4PionZeroField::operator=(const G4PionZeroField &) |
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| 58 | { |
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| 59 | throw G4HadronicException(__FILE__, __LINE__, "G4PionZeroField::operator= meant not to be accessible"); |
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| 60 | return *this; |
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| 61 | } |
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| 62 | |
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| 63 | |
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| 64 | G4int G4PionZeroField::operator==(const G4PionZeroField &) const |
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| 65 | { |
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| 66 | throw G4HadronicException(__FILE__, __LINE__, "G4PionZeroField::operator== meant not to be accessible"); |
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| 67 | return 0; |
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| 68 | } |
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| 69 | |
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| 70 | |
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| 71 | G4int G4PionZeroField::operator!=(const G4PionZeroField &) const |
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| 72 | { |
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| 73 | throw G4HadronicException(__FILE__, __LINE__, "G4PionZeroField::operator!= meant not to be accessible"); |
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| 74 | return 1; |
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| 75 | } |
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| 76 | |
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| 77 | |
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| 78 | G4double G4PionZeroField::GetField(const G4ThreeVector & aPosition) |
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| 79 | { |
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| 80 | // Field is 0 out of the nucleus! |
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| 81 | if(aPosition.mag() >= radius) return 0.0; |
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| 82 | |
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| 83 | G4double pionZeroMass = G4PionZero::PionZero()->GetPDGMass(); |
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[1340] | 84 | G4int A = theNucleus->GetMassNumber(); |
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| 85 | G4int Z = theNucleus->GetCharge(); |
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[819] | 86 | |
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[1340] | 87 | G4double bindingEnergy = G4NucleiProperties::GetBindingEnergy(A, Z); |
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[819] | 88 | G4double nucleusMass = Z*proton_mass_c2+(A-Z)*neutron_mass_c2+bindingEnergy; |
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| 89 | G4double reducedMass = pionZeroMass*nucleusMass/(pionZeroMass+nucleusMass); |
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| 90 | |
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| 91 | |
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| 92 | G4double density = A*theNucleus->GetNuclearDensity()->GetDensity(aPosition); |
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| 93 | G4double nucleonMass = (proton_mass_c2+neutron_mass_c2)/2; |
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| 94 | |
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| 95 | return 2.*pi*hbarc*hbarc/reducedMass*(1+pionZeroMass/nucleonMass)*theCoeff*density; |
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| 96 | } |
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| 97 | |
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| 98 | G4double G4PionZeroField::GetBarrier() |
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| 99 | { |
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| 100 | return 0; |
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| 101 | } |
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