source: trunk/source/materials/src/G4IonisParamElm.cc@ 827

Last change on this file since 827 was 822, checked in by garnier, 17 years ago

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[822]1//
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26//
27// $Id: G4IonisParamElm.cc,v 1.14 2006/06/29 19:12:43 gunter Exp $
28// GEANT4 tag $Name: $
29//
30//
31//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... ....oooOO0OOooo....
32//
33// 06-09-04, Update calculated values after any change of ionisation
34// potential change. V.Ivanchenko
35// 17-10-02, Fix excitation energy interpolation. V.Ivanchenko
36// 08-03-01, correct handling of fShellCorrectionVector. M.Maire
37// 22-11-00, tabulation of ionisation potential from
38// the ICRU Report N#37. V.Ivanchenko
39// 09-07-98, data moved from G4Element. M.Maire
40//
41//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... ....oooOO0OOooo....
42
43#include "G4IonisParamElm.hh"
44
45//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... ....oooOO0OOooo....
46
47G4IonisParamElm::G4IonisParamElm(G4double Z)
48{
49 if (Z < 1.) G4Exception
50 (" ERROR! It is not allowed to create an Element with Z < 1" );
51
52 // some basic functions of the atomic number
53 fZ = Z;
54 fZ3 = std::pow(fZ, 1./3.);
55 fZZ3 = std::pow(fZ*(fZ+1.), 1./3.);
56 flogZ3 = std::log(fZ)/3.;
57
58 // Parameters for energy loss by ionisation
59
60 // Mean excitation energy
61 // from "Stopping Powers for Electrons and Positrons"
62 // ICRU Report N#37, 1984 (energy in eV)
63 static double exc[100] = {
64 21.8, 20.9, 13.3, 15.9, 15.2, 13.0, 11.7, 11.9, 11.5, 13.7,
65 13.6, 13.0, 12.8, 12.4, 11.5, 11.3, 10.2, 10.4, 10.0, 9.6,
66 10.3, 10.6, 10.7, 10.7, 10.9, 11.0, 11.0, 11.1, 11.1, 11.0,
67 10.8, 10.4, 10.5, 10.2, 9.8, 9.8, 9.8, 9.6, 9.7, 9.8,
68 10.2, 10.1, 10.0, 10.0, 10.0, 10.2, 10.0, 9.8, 10.0, 9.8,
69 9.5, 9.3, 9.3, 8.9, 8.9, 8.8, 8.8, 8.8, 9.1, 9.1,
70 9.2, 9.3, 9.2, 9.2, 9.4, 9.5, 9.7, 9.7, 9.8, 9.8,
71 9.8, 9.8, 9.8, 9.8, 9.8, 9.8, 9.8, 10.1, 10.0, 10.0,
72 10.0, 10.0, 9.9, 9.9, 9.7, 9.2, 9.5, 9.4, 9.4, 9.4,
73 9.6, 9.7, 9.7, 9.8, 9.8, 9.8, 9.8, 9.9, 9.9, 9.9 };
74
75 G4int iz = (G4int)Z - 1 ;
76 if(0 > iz) iz = 0;
77 else if(99 < iz) iz = 99 ;
78 fMeanExcitationEnergy = fZ * exc[iz] * eV ;
79
80
81 fTau0 = 0.1*fZ3*MeV/proton_mass_c2;
82 fTaul = 2.*MeV/proton_mass_c2;
83
84 // compute the Bethe-Bloch formula for energy = fTaul*particle mass
85 G4double rate = fMeanExcitationEnergy/electron_mass_c2 ;
86 G4double w = fTaul*(fTaul+2.) ;
87 fBetheBlochLow = (fTaul+1.)*(fTaul+1.)*std::log(2.*w/rate)/w - 1. ;
88 fBetheBlochLow = 2.*fZ*twopi_mc2_rcl2*fBetheBlochLow ;
89
90 fClow = std::sqrt(fTaul)*fBetheBlochLow;
91 fAlow = 6.458040 * fClow/fTau0;
92 G4double Taum = 0.035*fZ3*MeV/proton_mass_c2;
93 fBlow =-3.229020*fClow/(fTau0*std::sqrt(Taum));
94
95 // Shell correction factors
96 fShellCorrectionVector = new G4double[3]; //[3]
97 rate = 0.001*fMeanExcitationEnergy/eV;
98 G4double rate2 = rate*rate;
99 /*
100 fShellCorrectionVector[0] = ( 1.10289e5 + 5.14781e8*rate)*rate2 ;
101 fShellCorrectionVector[1] = ( 7.93805e3 - 2.22565e7*rate)*rate2 ;
102 fShellCorrectionVector[2] = (-9.92256e1 + 2.10823e5*rate)*rate2 ;
103 */
104 fShellCorrectionVector[0] = ( 0.422377 + 3.858019*rate)*rate2 ;
105 fShellCorrectionVector[1] = ( 0.0304043 - 0.1667989*rate)*rate2 ;
106 fShellCorrectionVector[2] = (-0.00038106 + 0.00157955*rate)*rate2 ;
107}
108
109//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... ....oooOO0OOooo....
110
111// Fake default constructor - sets only member data and allocates memory
112// for usage restricted to object persistency
113
114G4IonisParamElm::G4IonisParamElm(__void__&)
115 : fShellCorrectionVector(0)
116{
117}
118
119//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... ....oooOO0OOooo....
120
121G4IonisParamElm::~G4IonisParamElm()
122{
123 if (fShellCorrectionVector) delete [] fShellCorrectionVector;
124}
125
126//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... ....oooOO0OOooo....
127
128G4IonisParamElm::G4IonisParamElm(G4IonisParamElm& right)
129{
130 *this = right;
131}
132
133//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... ....oooOO0OOooo....
134
135const G4IonisParamElm& G4IonisParamElm::operator=(const G4IonisParamElm& right)
136{
137 if (this != &right)
138 {
139 fZ = right.fZ;
140 fZ3 = right.fZ3;
141 fZZ3 = right.fZZ3;
142 flogZ3 = right.flogZ3;
143 fTau0 = right.fTau0;
144 fTaul = right.fTaul;
145 fBetheBlochLow = right.fBetheBlochLow;
146 fAlow = right.fAlow;
147 fBlow = right.fBlow;
148 fClow = right.fClow;
149 fMeanExcitationEnergy = right.fMeanExcitationEnergy;
150 if (fShellCorrectionVector) delete [] fShellCorrectionVector;
151 fShellCorrectionVector = new G4double[3];
152 fShellCorrectionVector[0] = right.fShellCorrectionVector[0];
153 fShellCorrectionVector[1] = right.fShellCorrectionVector[1];
154 fShellCorrectionVector[2] = right.fShellCorrectionVector[2];
155 }
156 return *this;
157}
158
159//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... ....oooOO0OOooo....
160
161G4int G4IonisParamElm::operator==(const G4IonisParamElm& right) const
162{
163 return (this == (G4IonisParamElm *) &right);
164}
165
166//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... ....oooOO0OOooo....
167
168G4int G4IonisParamElm::operator!=(const G4IonisParamElm& right) const
169{
170 return (this != (G4IonisParamElm *) &right);
171}
172
173//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo.... ....oooOO0OOooo....
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