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27 // ------------------------------------------- 24 // -------------------------------------------------------------------
28 // GEANT 4 class implementation file 25 // GEANT 4 class implementation file
29 // 26 //
30 // CERN, Geneva, Switzerland 27 // CERN, Geneva, Switzerland
31 // 28 //
32 // File name: G4KM_NucleonEqRhs.cc 29 // File name: G4KM_NucleonEqRhs.cc
33 // 30 //
34 // Author: Alessandro Brunengo (Al 31 // Author: Alessandro Brunengo (Alessandro.Brunengo@ge.infn.it)
35 // 32 //
36 // Creation date: 5 June 2000 33 // Creation date: 5 June 2000
37 // ------------------------------------------- 34 // -------------------------------------------------------------------
38 35
39 #include "G4KM_NucleonEqRhs.hh" 36 #include "G4KM_NucleonEqRhs.hh"
>> 37 #include "G4NucleiPropertiesTable.hh"
40 #include "G4VNuclearDensity.hh" 38 #include "G4VNuclearDensity.hh"
41 39
42 #include "G4PhysicalConstants.hh" <<
43 #include "G4Pow.hh" <<
44 40
45 G4KM_NucleonEqRhs::G4KM_NucleonEqRhs(G4KM_Dumm 41 G4KM_NucleonEqRhs::G4KM_NucleonEqRhs(G4KM_DummyField *field,
46 G4V3DNucleus * nucleus) : 42 G4V3DNucleus * nucleus) :
47 G4Mag_EqRhs(field), theNucleus(nucleus) 43 G4Mag_EqRhs(field), theNucleus(nucleus)
48 { 44 {
49 theMass = 0.; 45 theMass = 0.;
50 A = theNucleus->GetMassNumber(); 46 A = theNucleus->GetMassNumber();
51 factor = hbarc*hbarc*G4Pow::GetInstance()->A << 47 factor = hbarc*hbarc*pow(3.*pi2*A,2./3.)/3.;
52 } 48 }
53 49
54 50
55 void G4KM_NucleonEqRhs::EvaluateRhsGivenB(cons 51 void G4KM_NucleonEqRhs::EvaluateRhsGivenB(const G4double y[],
56 const G4double *, 52 const G4double *,
57 G4double dydx[]) const 53 G4double dydx[]) const
58 { 54 {
59 G4double yMod = std::sqrt(y[0]*y[0]+y[1]*y[1 << 55 G4double yMod = sqrt(y[0]*y[0]+y[1]*y[1]+y[2]*y[2]);
60 G4double e = std::sqrt(theMass*theMass+y[3]* << 56 G4double e = sqrt(theMass*theMass+y[3]*y[3]+y[4]*y[4]+y[5]*y[5]);
61 57
62 // y[0..2] is position 58 // y[0..2] is position
63 // y[3..5] is momentum (and not mom.direction) 59 // y[3..5] is momentum (and not mom.direction)
64 60
65 dydx[0] = c_light*y[3]/e; // 61 dydx[0] = c_light*y[3]/e; //
66 dydx[1] = c_light*y[4]/e; // dq/dt=dH/dp 62 dydx[1] = c_light*y[4]/e; // dq/dt=dH/dp = c*p/e
67 dydx[2] = c_light*y[5]/e; // 63 dydx[2] = c_light*y[5]/e; //
68 64
69 /* 65 /*
70 * // debug 66 * // debug
71 * G4cout << " Nucleon RHS : 0..2(dpos/dt) " 67 * G4cout << " Nucleon RHS : 0..2(dpos/dt) " <<
72 * dydx[0] << " " << 68 * dydx[0] << " " <<
73 * dydx[1] << " " << 69 * dydx[1] << " " <<
74 * dydx[2] << " " << G4endl; 70 * dydx[2] << " " << G4endl;
75 */ 71 */
76 72
77 73
78 // V=K*rho(r) ==> dydx[3] = -dV/dr*dr/dx = -K* 74 // 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/d 75 // 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 * d 76 // GF and dV/dt = dE/dt ==> dp/dt = dE/dt * dp/dE = dE/dt *e/p
81 // Idem for dydx[4] and dydx[5] 77 // Idem for dydx[4] and dydx[5]
82 78
83 G4ThreeVector pos(y[0],y[1],y[2]); 79 G4ThreeVector pos(y[0],y[1],y[2]);
84 80
85 const G4VNuclearDensity * nuclearDensity=the 81 const G4VNuclearDensity * nuclearDensity=theNucleus->GetNuclearDensity();
86 82
87 // do not check for theMass != 0 : it is an er 83 // do not check for theMass != 0 : it is an error and core dump will signal it
88 84
89 G4double density= nuclearDensity->GetDensit 85 G4double density= nuclearDensity->GetDensity(pos);
90 G4double deriv(0); 86 G4double deriv(0);
91 if (density > 0 ) deriv = (factor/theMass)/ << 87 if (density > 0 ) deriv = (factor/theMass)*
92 G4Pow::GetInstance()->A13(density)*nucle << 88 pow(density, -1./3.)*nuclearDensity->GetDeriv(pos);
93 89
94 // dydx[3] = yMod == 0 ? 0 : -deriv*y[0]/yMod 90 // dydx[3] = yMod == 0 ? 0 : -deriv*y[0]/yMod;
95 // dydx[4] = yMod == 0 ? 0 : -deriv*y[1]/yMod 91 // dydx[4] = yMod == 0 ? 0 : -deriv*y[1]/yMod;
96 // dydx[5] = yMod == 0 ? 0 : -deriv*y[2]/yMod 92 // dydx[5] = yMod == 0 ? 0 : -deriv*y[2]/yMod;
97 dydx[3] = yMod == 0 ? 0 : deriv*y[0]/yMod*c_ 93 dydx[3] = yMod == 0 ? 0 : deriv*y[0]/yMod*c_light;
98 dydx[4] = yMod == 0 ? 0 : deriv*y[1]/yMod*c_ 94 dydx[4] = yMod == 0 ? 0 : deriv*y[1]/yMod*c_light;
99 dydx[5] = yMod == 0 ? 0 : deriv*y[2]/yMod*c_ 95 dydx[5] = yMod == 0 ? 0 : deriv*y[2]/yMod*c_light;
100 96
101 97
102 /* 98 /*
103 * // debug 99 * // debug
104 * G4cout << " Nucleon RHS : 3..5(dE/dt) " << 100 * G4cout << " Nucleon RHS : 3..5(dE/dt) " <<
105 * dydx[3] << " " << 101 * dydx[3] << " " <<
106 * dydx[4] << " " << 102 * dydx[4] << " " <<
107 * dydx[5] << " " << G4endl; 103 * dydx[5] << " " << G4endl;
108 */ 104 */
109 } 105 }
110 106
111 // Here by design, but it is unnecessary for n << 107
112 void G4KM_NucleonEqRhs::SetChargeMomentumMass( << 108
113 { << 109
114 } <<
115 110