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35 //
36 // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
37 //
38 // MODULE: G4NuclearAbrasionGeometry.cc
39 //
40 // Version: B.1
41 // Date: 15/04/04
42 // Author: P R Truscott
43 // Organisation: QinetiQ Ltd, UK
44 // Customer: ESA/ESTEC, NOORDWIJK
45 // Contract: 17191/03/NL/LvH
46 //
47 // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
48 //
49 // CHANGE HISTORY
50 // --------------
51 //
52 // 18 November 2003, P R Truscott, QinetiQ Ltd, UK
53 // Created.
54 //
55 // 15 March 2004, P R Truscott, QinetiQ Ltd, UK
56 // Beta release
57 //
58 // 4 June 2004, J.P. Wellisch, CERN, Switzerland
59 // resolving technical portability issues.
60 //
61 // 12 June 2012, A. Ribon, CERN, Switzerland
62 // Fixing trivial warning errors of shadowed variables.
63 //
64 // 4 August 2015, A. Ribon, CERN, Switzerland
65 // Replacing std::pow with the faster G4Pow.
66 //
67 // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
68 ////////////////////////////////////////////////////////////////////////////////
69 //
70 #include "G4NuclearAbrasionGeometry.hh"
71 #include "G4WilsonRadius.hh"
72 #include "G4PhysicalConstants.hh"
73 #include "G4SystemOfUnits.hh"
74 #include "G4Pow.hh"
75 ////////////////////////////////////////////////////////////////////////////////
76 //
77 G4NuclearAbrasionGeometry::G4NuclearAbrasionGeometry (G4double AP1,
78 G4double AT1, G4double r1)
79 {
80 //
81 //
82 // Initialise variables for interaction geometry.
83 //
84 G4WilsonRadius aR;
85 AP = AP1;
86 AT = AT1;
87 rP = aR.GetWilsonRadius(AP);
88 rT = aR.GetWilsonRadius(AT);
89 r = r1;
90 n = rP / (rP + rT);
91 b = r / (rP + rT);
92 m = rT / rP;
93 Q = (1.0 - b)/n;
94 S = Q * Q;
95 T = S * Q;
96 R = std::sqrt(m*n);
97 U = 1.0/m - 2.0;
98 //
99 //
100 // Initialise the threshold radius-ratio at which interactions are considered
101 // peripheral or central.
102 //
103 rth = 2.0/3.0;
104 B = 10.0 * MeV;
105 }
106 ////////////////////////////////////////////////////////////////////////////////
107 //
108 G4NuclearAbrasionGeometry::~G4NuclearAbrasionGeometry ()
109 {;}
110 ////////////////////////////////////////////////////////////////////////////////
111 //
112 void G4NuclearAbrasionGeometry::SetPeripheralThreshold (G4double rth1)
113 {if (rth1 > 0.0 && rth1 <= 1.0) rth = rth1;}
114 ////////////////////////////////////////////////////////////////////////////////
115 //
116 G4double G4NuclearAbrasionGeometry::GetPeripheralThreshold ()
117 {return rth;}
118 ////////////////////////////////////////////////////////////////////////////////
119 //
120 G4double G4NuclearAbrasionGeometry::P ()
121 {
122 //
123 //
124 // Initialise the value for P, then determine the actual value depending upon
125 // whether the projectile is larger or smaller than the target and these radii
126 // in relation to the impact parameter.
127 //
128 G4double valueP = 0.0;
129
130 if (rT > rP)
131 {
132 if (rT-rP<=r && r<=rT+rP) valueP = 0.125*R*U*S - 0.125*(0.5*R*U+1.0)*T;
133 else valueP = -1.0;
134 }
135 else
136 {
137 if (rP-rT<=r && r<=rP+rT) valueP = 0.125*R*U*S - 0.125*(0.5*std::sqrt(n/m)*U-
138 (std::sqrt(1.0-m*m)/n - 1.0)*std::sqrt((2.0-m)/G4Pow::GetInstance()->powN(m,5)))*T;
139 else valueP = (std::sqrt(1.0-m*m)/n-1.0)*std::sqrt(1.0-b*b/n/n);
140 }
141
142 if (!(valueP <= 1.0 && valueP>= -1.0))
143 {
144 if (valueP > 1.0) valueP = 1.0;
145 else valueP = -1.0;
146 }
147 return valueP;
148 }
149 ////////////////////////////////////////////////////////////////////////////////
150 //
151 G4double G4NuclearAbrasionGeometry::F ()
152 {
153 //
154 //
155 // Initialise the value for F, then determine the actual value depending upon
156 // whether the projectile is larger or smaller than the target and these radii
157 // in relation to the impact parameter.
158 //
159 G4double valueF = 0.0;
160
161 if (rT > rP)
162 {
163 if (rT-rP<=r && r<=rT+rP) valueF = 0.75*R*S - 0.125*(3.0*R-1.0)*T;
164 else valueF = 1.0;
165 }
166 else
167 {
168 if (rP-rT<=r && r<=rP+rT) valueF = 0.75*R*S - 0.125*(3.0*std::sqrt(n/m)-
169 (1.0-G4Pow::GetInstance()->powA(1.0-m*m,3.0/2.0))*std::sqrt(1.0-G4Pow::GetInstance()->powN(1.0-m,2))/G4Pow::GetInstance()->powN(m,3))*T;
170 else valueF = (1.0-G4Pow::GetInstance()->powA(1.0-m*m,3.0/2.0))*std::sqrt(1.0-b*b/n/n);
171 }
172
173 if (!(valueF <= 1.0 && valueF>= 0.0))
174 {
175 if (valueF > 1.0) valueF = 1.0;
176 else valueF = 0.0;
177 }
178 return valueF;
179 }
180 ////////////////////////////////////////////////////////////////////////////////
181 //
182 G4double G4NuclearAbrasionGeometry::GetExcitationEnergyOfProjectile ()
183 {
184 G4double F1 = F();
185 G4double P1 = P();
186 G4double Es = 0.0;
187
188 Es = 0.95 * MeV * 4.0 * pi * rP*rP/fermi/fermi *
189 (1.0+P1-G4Pow::GetInstance()->A23(1.0-F1));
190 // if (rT < rP && r < rP-rT)
191 if ((r-rP)/rT < rth)
192 {
193 G4double omega = 0.0;
194 if (AP < 12.0) omega = 1500.0;
195 else if (AP <= 16.0) omega = 1500.0 - 320.0*(AP-12.0);
196 Es *= 1.0 + F1*(5.0+omega*F1*F1);
197 }
198
199 if (Es < 0.0)
200 Es = 0.0;
201 else if (Es > B * AP)
202 Es = B * AP;
203 return Es;
204 }
205
206
207 G4double G4NuclearAbrasionGeometry::GetExcitationEnergyOfTarget ()
208 {
209 // This member function declares a new G4NuclearAbrasionGeometry object
210 // but with the projectile and target exchanged to determine the values
211 // for F and P. Determination of the excess surface area and excitation
212 // energy is as above.
213
214 G4NuclearAbrasionGeometry* revAbrasionGeometry =
215 new G4NuclearAbrasionGeometry(AT, AP, r);
216 G4double F1 = revAbrasionGeometry->F();
217 G4double P1 = revAbrasionGeometry->P();
218 G4double Es = 0.0;
219
220 Es = 0.95 * MeV * 4.0 * pi * rT*rT/fermi/fermi *
221 (1.0+P1-G4Pow::GetInstance()->A23(1.0-F1));
222
223 // if (rP < rT && r < rT-rP)
224 if ((r-rT)/rP < rth) {
225 G4double omega = 0.0;
226 if (AT < 12.0) omega = 1500.0;
227 else if (AT <= 16.0) omega = 1500.0 - 320.0*(AT-12.0);
228 Es *= 1.0 + F1*(5.0+omega*F1*F1);
229 }
230
231 if (Es < 0.0)
232 Es = 0.0;
233 else if (Es > B * AT)
234 Es = B * AT;
235
236 delete revAbrasionGeometry;
237
238 return Es;
239 }
240