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1 // 1 2 // ******************************************* 3 // * License and Disclaimer 4 // * 5 // * The Geant4 software is copyright of th 6 // * the Geant4 Collaboration. It is provided 7 // * conditions of the Geant4 Software License 8 // * LICENSE and available at http://cern.ch/ 9 // * include a list of copyright holders. 10 // * 11 // * Neither the authors of this software syst 12 // * institutes,nor the agencies providing fin 13 // * work make any representation or warran 14 // * regarding this software system or assum 15 // * use. Please see the license in the file 16 // * for the full disclaimer and the limitatio 17 // * 18 // * This code implementation is the result 19 // * technical work of the GEANT4 collaboratio 20 // * By using, copying, modifying or distri 21 // * any work based on the software) you ag 22 // * use in resulting scientific publicati 23 // * acceptance of all terms of the Geant4 Sof 24 // ******************************************* 25 // 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 (Al 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_Dumm 46 G4V3DNucleus * nucleus) : 47 G4Mag_EqRhs(field), theNucleus(nucleus) 48 { 49 theMass = 0.; 50 A = theNucleus->GetMassNumber(); 51 factor = hbarc*hbarc*G4Pow::GetInstance()->A 52 } 53 54 55 void G4KM_NucleonEqRhs::EvaluateRhsGivenB(cons 56 const G4double *, 57 G4double dydx[]) const 58 { 59 G4double yMod = std::sqrt(y[0]*y[0]+y[1]*y[1 60 G4double e = std::sqrt(theMass*theMass+y[3]* 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 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* 79 // GF should be V=K*rho(r) ==> dydx[3] = -dV/d 80 // GF and dV/dt = dE/dt ==> dp/dt = dE/dt * d 81 // Idem for dydx[4] and dydx[5] 82 83 G4ThreeVector pos(y[0],y[1],y[2]); 84 85 const G4VNuclearDensity * nuclearDensity=the 86 87 // do not check for theMass != 0 : it is an er 88 89 G4double density= nuclearDensity->GetDensit 90 G4double deriv(0); 91 if (density > 0 ) deriv = (factor/theMass)/ 92 G4Pow::GetInstance()->A13(density)*nucle 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_ 98 dydx[4] = yMod == 0 ? 0 : deriv*y[1]/yMod*c_ 99 dydx[5] = yMod == 0 ? 0 : deriv*y[2]/yMod*c_ 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 n 112 void G4KM_NucleonEqRhs::SetChargeMomentumMass( 113 { 114 } 115