| 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: G4PionPlusField.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 "G4PionPlusField.hh"
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| 39 | #include "G4NucleiProperties.hh"
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| 40 | #include "G4VNuclearDensity.hh"
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| 41 | #include "G4FermiMomentum.hh"
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| 42 | #include "G4PionPlus.hh"
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| 43 | #include "G4HadTmpUtil.hh"
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| 44 |
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| 45 |
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| 46 | G4PionPlusField::G4PionPlusField(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 | G4PionPlusField::~G4PionPlusField()
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| 54 | { }
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| 55 |
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| 56 |
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| 57 | const G4PionPlusField & G4PionPlusField::operator=(const G4PionPlusField &)
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| 58 | {
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| 59 | throw G4HadronicException(__FILE__, __LINE__, "G4PionPlusField::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 G4PionPlusField::operator==(const G4PionPlusField &) const
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| 65 | {
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| 66 | throw G4HadronicException(__FILE__, __LINE__, "G4PionPlusField::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 G4PionPlusField::operator!=(const G4PionPlusField &) const
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| 72 | {
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| 73 | throw G4HadronicException(__FILE__, __LINE__, "G4PionPlusField::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 G4PionPlusField::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 pionPlusMass = G4PionPlus::PionPlus()->GetPDGMass();
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| 84 |
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| 85 | G4double A = theNucleus->GetMassNumber();
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| 86 | G4double Z = theNucleus->GetCharge();
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| 87 | G4double bindingEnergy = G4NucleiProperties::GetBindingEnergy(G4lrint(A), G4lrint(Z));
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| 88 | G4double nucleusMass = Z*proton_mass_c2+(A-Z)*neutron_mass_c2+bindingEnergy;
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| 89 | G4double reducedMass = pionPlusMass*nucleusMass/(pionPlusMass+nucleusMass);
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| 90 |
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| 91 | G4double density = A*theNucleus->GetNuclearDensity()->GetDensity(aPosition);
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| 92 | G4double nucleonMass = (proton_mass_c2+neutron_mass_c2)/2;
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| 93 |
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| 94 | return 2.*pi*hbarc*hbarc/reducedMass*(1+pionPlusMass/nucleonMass)*theCoeff*density + GetBarrier();
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| 95 | }
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| 96 |
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| 97 |
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| 98 | G4double G4PionPlusField::GetBarrier()
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| 99 | {
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| 100 | G4double A = theNucleus->GetMassNumber();
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| 101 | G4double Z = theNucleus->GetCharge();
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| 102 | G4double coulombBarrier = (1.44/1.14) * MeV * Z / (1.0 + std::pow(A,1./3.));
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| 103 | return coulombBarrier;
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| 104 | }
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