| 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: G4KM_OpticalEqRhs.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 |
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| 39 | #include "G4KM_OpticalEqRhs.hh"
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| 40 | #include "G4NucleiProperties.hh"
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| 41 | #include "G4VNuclearDensity.hh"
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| 42 | #include "G4HadTmpUtil.hh"
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| 43 |
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| 44 |
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| 45 | G4KM_OpticalEqRhs::G4KM_OpticalEqRhs(G4KM_DummyField *field,
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| 46 | G4V3DNucleus * nucleus) :
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| 47 | G4Mag_EqRhs(field), theNucleus(nucleus)
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| 48 | {
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| 49 | theFactor = 0;
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| 50 | theMass = 0;
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| 51 | }
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| 52 |
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| 53 |
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| 54 | void G4KM_OpticalEqRhs::SetFactor(G4double mass, G4double opticalParameter)
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| 55 | {
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| 56 | G4double A = theNucleus->GetMassNumber();
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| 57 | G4double Z = theNucleus->GetCharge();
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| 58 | G4double bindingEnergy = G4NucleiProperties::GetBindingEnergy(G4lrint(A), G4lrint(Z));
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| 59 | G4double nucleusMass = Z*proton_mass_c2+(A-Z)*neutron_mass_c2+bindingEnergy;
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| 60 | G4double reducedMass = mass*nucleusMass/(mass+nucleusMass);
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| 61 |
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| 62 | G4double nucleonMass = (proton_mass_c2+neutron_mass_c2)/2;
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| 63 |
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| 64 | // _factor in (MeV*fermi)*fermi/MeV = fermi*fermi -- need to have A as density normalized to 1
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| 65 | theFactor = 2*pi*hbarc*hbarc*(1+mass/nucleonMass)* opticalParameter/reducedMass * A;
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| 66 |
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| 67 | theMass = mass;
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| 68 | }
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| 69 |
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| 70 |
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| 71 | void G4KM_OpticalEqRhs::EvaluateRhsGivenB(const G4double y[], const G4double *,
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| 72 | G4double dydx[]) const
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| 73 | {
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| 74 | G4double yMod = std::sqrt(y[0]*y[0]+y[1]*y[1]+y[2]*y[2]);
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| 75 | G4double e = std::sqrt(theMass*theMass+y[3]*y[3]+y[4]*y[4]+y[5]*y[5]);
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| 76 | dydx[0] = c_light*y[3]/e; //
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| 77 | dydx[1] = c_light*y[4]/e; // dq/dt=dH/dp = c*p/e
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| 78 | dydx[2] = c_light*y[5]/e; //
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| 79 |
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| 80 | // V=K*rho(r) ==> dydx[3] = -dV/dr*dr/dx = -K*d(rho)/dr*dr/dx.
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| 81 | // Idem for dydx[4] and dydx[5]
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| 82 |
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| 83 | const G4VNuclearDensity * nuclearDensity=theNucleus->GetNuclearDensity();
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| 84 |
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| 85 | G4ThreeVector pos(y[0],y[1],y[2]);
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| 86 | G4double deriv = theFactor*nuclearDensity->GetDeriv(pos);
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| 87 |
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| 88 | dydx[3] = yMod == 0 ? 0 : -deriv*y[0]/yMod*c_light;
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| 89 | dydx[4] = yMod == 0 ? 0 : -deriv*y[1]/yMod*c_light;
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| 90 | dydx[5] = yMod == 0 ? 0 : -deriv*y[2]/yMod*c_light;
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| 91 | }
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| 92 |
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| 93 |
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| 94 |
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| 95 |
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