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: G4SigmaZeroField.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 "G4SigmaZeroField.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 "G4SigmaZero.hh" |
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43 | #include "G4HadTmpUtil.hh" |
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44 | |
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45 | G4SigmaZeroField::G4SigmaZeroField(G4V3DNucleus * nucleus, G4double coeff) |
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46 | : G4VNuclearField(nucleus) |
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47 | { |
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48 | theCoeff = coeff; |
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49 | } |
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50 | |
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51 | |
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52 | G4SigmaZeroField::~G4SigmaZeroField() |
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53 | { } |
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54 | |
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55 | |
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56 | const G4SigmaZeroField & G4SigmaZeroField::operator=(const G4SigmaZeroField &) |
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57 | { |
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58 | throw G4HadronicException(__FILE__, __LINE__, "G4SigmaZeroField::operator= meant not to be accessible"); |
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59 | return *this; |
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60 | } |
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61 | |
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62 | |
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63 | G4int G4SigmaZeroField::operator==(const G4SigmaZeroField &) const |
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64 | { |
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65 | throw G4HadronicException(__FILE__, __LINE__, "G4SigmaZeroField::operator== meant not to be accessible"); |
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66 | return 0; |
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67 | } |
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68 | |
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69 | |
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70 | G4int G4SigmaZeroField::operator!=(const G4SigmaZeroField &) const |
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71 | { |
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72 | throw G4HadronicException(__FILE__, __LINE__, "G4SigmaZeroField::operator!= meant not to be accessible"); |
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73 | return 1; |
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74 | } |
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75 | |
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76 | |
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77 | |
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78 | G4double G4SigmaZeroField::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 sigmaZeroMass = G4SigmaZero::SigmaZero()->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 = sigmaZeroMass*nucleusMass/(sigmaZeroMass+nucleusMass); |
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90 | |
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91 | const G4VNuclearDensity * nuclearDensity=theNucleus->GetNuclearDensity(); |
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92 | G4double density = nuclearDensity->GetDensity(aPosition); |
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93 | |
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94 | return -2.*pi*hbarc*hbarc/reducedMass*(2.0)*theCoeff*density; |
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95 | } |
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96 | |
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97 | |
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98 | G4double G4SigmaZeroField::GetBarrier() |
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99 | { |
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100 | return 0.; |
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101 | } |
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102 | |
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