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Geant4/processes/hadronic/models/binary_cascade/src/G4KM_NucleonEqRhs.cc

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 26 //
 27 // -------------------------------------------------------------------
 28 //      GEANT 4 class implementation file 
 29 //
 30 //      CERN, Geneva, Switzerland
 31 //
 32 //      File name:     G4KM_NucleonEqRhs.cc
 33 //
 34 //      Author:        Alessandro Brunengo (Alessandro.Brunengo@ge.infn.it)
 35 // 
 36 //      Creation date: 5 June 2000
 37 // -------------------------------------------------------------------
 38 
 39 #include "G4KM_NucleonEqRhs.hh"
 40 #include "G4VNuclearDensity.hh"
 41 
 42 #include "G4PhysicalConstants.hh"
 43 #include "G4Pow.hh"
 44 
 45 G4KM_NucleonEqRhs::G4KM_NucleonEqRhs(G4KM_DummyField *field,
 46              G4V3DNucleus * nucleus) :
 47   G4Mag_EqRhs(field), theNucleus(nucleus)
 48 {
 49   theMass = 0.;
 50   A = theNucleus->GetMassNumber();
 51   factor = hbarc*hbarc*G4Pow::GetInstance()->A23(3.*pi2*A)/3.;
 52 }
 53 
 54 
 55 void G4KM_NucleonEqRhs::EvaluateRhsGivenB(const G4double y[],
 56             const G4double *,
 57             G4double dydx[]) const
 58 {
 59   G4double yMod = std::sqrt(y[0]*y[0]+y[1]*y[1]+y[2]*y[2]);
 60   G4double e = std::sqrt(theMass*theMass+y[3]*y[3]+y[4]*y[4]+y[5]*y[5]);
 61 
 62 // y[0..2] is position
 63 // y[3..5] is momentum (and not mom.direction)
 64     
 65   dydx[0] = c_light*y[3]/e;   //
 66   dydx[1] = c_light*y[4]/e;   //  dq/dt=dH/dp = c*p/e
 67   dydx[2] = c_light*y[5]/e;   // 
 68 
 69 /*
 70  * // debug
 71  *  G4cout << " Nucleon RHS : 0..2(dpos/dt) " << 
 72  *       dydx[0] << " " <<
 73  *       dydx[1] << " " <<
 74  *       dydx[2] << " " << G4endl;
 75  */
 76 
 77       
 78 // V=K*rho(r) ==> dydx[3] = -dV/dr*dr/dx = -K*d(rho)/dr*dr/dx.
 79 // GF should be V=K*rho(r) ==> dydx[3] = -dV/dr*dr/dx = -K*d(rho)/dr*dr/dt
 80 // GF  and dV/dt = dE/dt ==> dp/dt = dE/dt * dp/dE = dE/dt *e/p
 81 // Idem for dydx[4] and dydx[5]
 82 
 83   G4ThreeVector pos(y[0],y[1],y[2]);
 84 
 85   const G4VNuclearDensity * nuclearDensity=theNucleus->GetNuclearDensity();
 86 
 87 // do not check for theMass != 0 : it is an error and core dump will signal it
 88 
 89   G4double density=  nuclearDensity->GetDensity(pos);
 90   G4double deriv(0);
 91   if (density > 0 ) deriv = (factor/theMass)/
 92       G4Pow::GetInstance()->A13(density)*nuclearDensity->GetDeriv(pos);
 93 
 94 //  dydx[3] = yMod == 0 ? 0 : -deriv*y[0]/yMod;
 95 //  dydx[4] = yMod == 0 ? 0 : -deriv*y[1]/yMod;
 96 //  dydx[5] = yMod == 0 ? 0 : -deriv*y[2]/yMod;
 97   dydx[3] = yMod == 0 ? 0 : deriv*y[0]/yMod*c_light;
 98   dydx[4] = yMod == 0 ? 0 : deriv*y[1]/yMod*c_light;
 99   dydx[5] = yMod == 0 ? 0 : deriv*y[2]/yMod*c_light;
100 
101 
102 /*
103  * // debug
104  * G4cout << " Nucleon RHS : 3..5(dE/dt) " << 
105  *       dydx[3] << " " <<
106  *       dydx[4] << " " <<
107  *       dydx[5] << " " << G4endl;
108  */
109 }
110 
111 // Here by design, but it is unnecessary for nuclear fields
112 void G4KM_NucleonEqRhs::SetChargeMomentumMass(G4ChargeState,G4double ,G4double )
113 { 
114 }
115