1 | // |
---|
2 | // ******************************************************************** |
---|
3 | // * License and Disclaimer * |
---|
4 | // * * |
---|
5 | // * The Geant4 software is copyright of the Copyright Holders of * |
---|
6 | // * the Geant4 Collaboration. It is provided under the terms and * |
---|
7 | // * conditions of the Geant4 Software License, included in the file * |
---|
8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
---|
9 | // * include a list of copyright holders. * |
---|
10 | // * * |
---|
11 | // * Neither the authors of this software system, nor their employing * |
---|
12 | // * institutes,nor the agencies providing financial support for this * |
---|
13 | // * work make any representation or warranty, express or implied, * |
---|
14 | // * regarding this software system or assume any liability for its * |
---|
15 | // * use. Please see the license in the file LICENSE and URL above * |
---|
16 | // * for the full disclaimer and the limitation of liability. * |
---|
17 | // * * |
---|
18 | // * This code implementation is the result of the scientific and * |
---|
19 | // * technical work of the GEANT4 collaboration. * |
---|
20 | // * By using, copying, modifying or distributing the software (or * |
---|
21 | // * any work based on the software) you agree to acknowledge its * |
---|
22 | // * use in resulting scientific publications, and indicate your * |
---|
23 | // * acceptance of all terms of the Geant4 Software license. * |
---|
24 | // ******************************************************************** |
---|
25 | // |
---|
26 | // $Id: G4FinalStateElasticBrennerZaider.cc,v 1.11 2009/06/11 15:47:08 mantero Exp $ |
---|
27 | // GEANT4 tag $Name: geant4-09-03 $ |
---|
28 | |
---|
29 | #include "G4FinalStateElasticBrennerZaider.hh" |
---|
30 | |
---|
31 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
---|
32 | |
---|
33 | G4FinalStateElasticBrennerZaider::G4FinalStateElasticBrennerZaider() |
---|
34 | { |
---|
35 | lowEnergyLimit = 8.23 * eV; // SI : i/o of 7.4 * eV; |
---|
36 | highEnergyLimit = 200 * eV; |
---|
37 | |
---|
38 | betaCoeff.push_back(7.51525); |
---|
39 | betaCoeff.push_back(-0.41912); |
---|
40 | betaCoeff.push_back(7.2017E-3); |
---|
41 | betaCoeff.push_back(-4.646E-5); |
---|
42 | betaCoeff.push_back(1.02897E-7); |
---|
43 | |
---|
44 | deltaCoeff.push_back(2.9612); |
---|
45 | deltaCoeff.push_back(-0.26376); |
---|
46 | deltaCoeff.push_back(4.307E-3); |
---|
47 | deltaCoeff.push_back(-2.6895E-5); |
---|
48 | deltaCoeff.push_back(5.83505E-8); |
---|
49 | |
---|
50 | gamma035_10Coeff.push_back(-1.7013); |
---|
51 | gamma035_10Coeff.push_back(-1.48284); |
---|
52 | gamma035_10Coeff.push_back(0.6331); |
---|
53 | gamma035_10Coeff.push_back(-0.10911); |
---|
54 | gamma035_10Coeff.push_back(8.358E-3); |
---|
55 | gamma035_10Coeff.push_back(-2.388E-4); |
---|
56 | |
---|
57 | gamma10_100Coeff.push_back(-3.32517); |
---|
58 | gamma10_100Coeff.push_back(0.10996); |
---|
59 | gamma10_100Coeff.push_back(-4.5255E-3); |
---|
60 | gamma10_100Coeff.push_back(5.8372E-5); |
---|
61 | gamma10_100Coeff.push_back(-2.4659E-7); |
---|
62 | |
---|
63 | gamma100_200Coeff.push_back(2.4775E-2); |
---|
64 | gamma100_200Coeff.push_back(-2.96264E-5); |
---|
65 | gamma100_200Coeff.push_back(-1.20655E-7); |
---|
66 | |
---|
67 | G4cout << G4endl; |
---|
68 | G4cout << "*******************************************************************************" << G4endl; |
---|
69 | G4cout << "*******************************************************************************" << G4endl; |
---|
70 | G4cout << " The class G4FinalStateElasticBrennerZaider is NOT SUPPORTED ANYMORE. " << G4endl; |
---|
71 | G4cout << " It will be REMOVED with the next major release of Geant4. " << G4endl; |
---|
72 | G4cout << " Please consult: https://twiki.cern.ch/twiki/bin/view/Geant4/LoweProcesses" << G4endl; |
---|
73 | G4cout << "*******************************************************************************" << G4endl; |
---|
74 | G4cout << "*******************************************************************************" << G4endl; |
---|
75 | G4cout << G4endl; |
---|
76 | } |
---|
77 | |
---|
78 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
---|
79 | |
---|
80 | G4FinalStateElasticBrennerZaider::~G4FinalStateElasticBrennerZaider() |
---|
81 | {} |
---|
82 | |
---|
83 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
---|
84 | |
---|
85 | const G4FinalStateProduct& G4FinalStateElasticBrennerZaider::GenerateFinalState(const G4Track& track, const G4Step& /* step */) |
---|
86 | { |
---|
87 | product.Clear(); |
---|
88 | |
---|
89 | G4double k = track.GetDynamicParticle()->GetKineticEnergy(); |
---|
90 | |
---|
91 | if ( k>= lowEnergyLimit && k<=highEnergyLimit ) |
---|
92 | { |
---|
93 | G4double cosTheta = RandomizeCosTheta(k); |
---|
94 | |
---|
95 | G4double phi = 2. * pi * G4UniformRand(); |
---|
96 | |
---|
97 | G4ThreeVector zVers = track.GetDynamicParticle()->GetMomentumDirection(); |
---|
98 | G4ThreeVector xVers = zVers.orthogonal(); |
---|
99 | G4ThreeVector yVers = zVers.cross(xVers); |
---|
100 | |
---|
101 | G4double xDir = std::sqrt(1. - cosTheta*cosTheta); |
---|
102 | G4double yDir = xDir; |
---|
103 | xDir *= std::cos(phi); |
---|
104 | yDir *= std::sin(phi); |
---|
105 | |
---|
106 | G4ThreeVector zPrimeVers((xDir*xVers + yDir*yVers + cosTheta*zVers)); |
---|
107 | |
---|
108 | product.ModifyPrimaryParticle(zPrimeVers,k); |
---|
109 | } |
---|
110 | |
---|
111 | if (k<lowEnergyLimit) |
---|
112 | { |
---|
113 | product.KillPrimaryParticle(); |
---|
114 | } |
---|
115 | |
---|
116 | return product; |
---|
117 | } |
---|
118 | |
---|
119 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
---|
120 | |
---|
121 | G4double G4FinalStateElasticBrennerZaider::RandomizeCosTheta(G4double k) |
---|
122 | { |
---|
123 | // d sigma_el 1 beta(K) |
---|
124 | // ------------ (K) ~ --------------------------------- + --------------------------------- |
---|
125 | // d Omega (1 + 2 gamma(K) - cos(theta))^2 (1 + 2 delta(K) + cos(theta))^2 |
---|
126 | // |
---|
127 | // Maximum is < 1/(4 gamma(K)^2) + beta(K)/((2+2delta(K))^2) |
---|
128 | // |
---|
129 | // Phys. Med. Biol. 29 N.4 (1983) 443-447 |
---|
130 | |
---|
131 | // gamma(K), beta(K) and delta(K) are polynomials with coefficients for energy measured in eV |
---|
132 | |
---|
133 | k /= eV; |
---|
134 | |
---|
135 | G4double beta = std::exp(CalculatePolynomial(k,betaCoeff)); |
---|
136 | G4double delta = std::exp(CalculatePolynomial(k,deltaCoeff)); |
---|
137 | G4double gamma; |
---|
138 | |
---|
139 | if (k > 100.) |
---|
140 | { |
---|
141 | gamma = CalculatePolynomial(k, gamma100_200Coeff); |
---|
142 | // Only in this case it is not the exponent of the polynomial |
---|
143 | } |
---|
144 | else |
---|
145 | { |
---|
146 | if (k>10) |
---|
147 | { |
---|
148 | gamma = std::exp(CalculatePolynomial(k, gamma10_100Coeff)); |
---|
149 | } |
---|
150 | else |
---|
151 | { |
---|
152 | gamma = std::exp(CalculatePolynomial(k, gamma035_10Coeff)); |
---|
153 | } |
---|
154 | } |
---|
155 | |
---|
156 | G4double oneOverMax = 1. / (1./(4.*gamma*gamma) + beta/( (2.+2.*delta)*(2.+2.*delta) )); |
---|
157 | |
---|
158 | G4double cosTheta = 0.; |
---|
159 | G4double leftDenominator = 0.; |
---|
160 | G4double rightDenominator = 0.; |
---|
161 | G4double fCosTheta = 0.; |
---|
162 | |
---|
163 | do |
---|
164 | { |
---|
165 | cosTheta = 2. * G4UniformRand() - 1.; |
---|
166 | leftDenominator = (1. + 2.*gamma - cosTheta); |
---|
167 | rightDenominator = (1. + 2.*delta + cosTheta); |
---|
168 | if ( (leftDenominator * rightDenominator) != 0. ) |
---|
169 | { |
---|
170 | fCosTheta = oneOverMax * (1./(leftDenominator*leftDenominator) + beta/(rightDenominator*rightDenominator)); |
---|
171 | } |
---|
172 | } |
---|
173 | while (fCosTheta < G4UniformRand()); |
---|
174 | |
---|
175 | return cosTheta; |
---|
176 | } |
---|
177 | |
---|
178 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo...... |
---|
179 | |
---|
180 | G4double G4FinalStateElasticBrennerZaider::CalculatePolynomial(G4double k, std::vector<G4double>& vec) |
---|
181 | { |
---|
182 | // Sum_{i=0}^{size-1} vector_i k^i |
---|
183 | // |
---|
184 | // Phys. Med. Biol. 29 N.4 (1983) 443-447 |
---|
185 | |
---|
186 | G4double result = 0.; |
---|
187 | size_t size = vec.size(); |
---|
188 | |
---|
189 | while (size>0) |
---|
190 | { |
---|
191 | size--; |
---|
192 | |
---|
193 | result *= k; |
---|
194 | result += vec[size]; |
---|
195 | } |
---|
196 | |
---|
197 | return result; |
---|
198 | } |
---|
199 | |
---|