source: trunk/source/processes/hadronic/models/de_excitation/evaporation/src/G4TritonEvaporationProbability.cc @ 1007

Last change on this file since 1007 was 1007, checked in by garnier, 15 years ago

update to geant4.9.2
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25//
26//J.M. Quesada (August2008). Based on:
27//
28// Hadronic Process: Nuclear De-excitations
29// by V. Lara (Oct 1998)
30//
31// Modif (03 September 2008) by J. M. Quesada for external choice of inverse
32// cross section option
33
34#include "G4TritonEvaporationProbability.hh"
35
36G4TritonEvaporationProbability::G4TritonEvaporationProbability() :
37    G4EvaporationProbability(3,1,2,&theCoulombBarrier) // A,Z,Gamma,&theCoulombBarrier
38{
39
40}
41
42G4TritonEvaporationProbability::G4TritonEvaporationProbability(const G4TritonEvaporationProbability &) : G4EvaporationProbability()
43{
44    throw G4HadronicException(__FILE__, __LINE__, "G4TritonEvaporationProbability::copy_constructor meant to not be accessable");
45}
46
47
48
49
50const G4TritonEvaporationProbability & G4TritonEvaporationProbability::
51operator=(const G4TritonEvaporationProbability &)
52{
53    throw G4HadronicException(__FILE__, __LINE__, "G4TritonEvaporationProbability::operator= meant to not be accessable");
54    return *this;
55}
56
57
58G4bool G4TritonEvaporationProbability::operator==(const G4TritonEvaporationProbability &) const
59{
60    return false;
61}
62
63G4bool G4TritonEvaporationProbability::operator!=(const G4TritonEvaporationProbability &) const
64{
65    return true;
66}
67
68   G4double G4TritonEvaporationProbability::CalcAlphaParam(const G4Fragment & fragment) 
69  { return 1.0 + CCoeficient(static_cast<G4double>(fragment.GetZ()-GetZ()));}
70       
71  G4double G4TritonEvaporationProbability::CalcBetaParam(const G4Fragment & ) 
72  { return 0.0; }
73
74G4double G4TritonEvaporationProbability::CCoeficient(const G4double aZ) 
75{
76    // Data comes from
77    // Dostrovsky, Fraenkel and Friedlander
78    // Physical Review, vol 116, num. 3 1959
79    //
80    // const G4int size = 5;
81    // G4double Zlist[5] = { 10.0, 20.0, 30.0, 50.0, 70.0};
82    // G4double Cp[5] = { 0.50, 0.28, 0.20, 0.15, 0.10};
83    // C for triton is equal to C for protons divided by 3
84    G4double C = 0.0;
85       
86    if (aZ >= 70) {
87        C = 0.10;
88    } else {
89        C = ((((0.15417e-06*aZ) - 0.29875e-04)*aZ + 0.21071e-02)*aZ - 0.66612e-01)*aZ + 0.98375;
90    }
91       
92    return C/3.0;
93       
94}
95
96///////////////////////////////////////////////////////////////////////////////////
97//J. M. Quesada (Dec 2007-June 2008): New inverse reaction cross sections
98//OPT=0 Dostrovski's parameterization
99//OPT=1,2 Chatterjee's paramaterization
100//OPT=3,4 Kalbach's parameterization
101//
102 G4double G4TritonEvaporationProbability::CrossSection(const  G4Fragment & fragment, const  G4double K)
103{
104  theA=GetA();
105  theZ=GetZ();
106  ResidualA=fragment.GetA()-theA;
107  ResidualZ=fragment.GetZ()-theZ; 
108 
109  ResidualAthrd=std::pow(ResidualA,0.33333);
110  FragmentA=fragment.GetA();
111  FragmentAthrd=std::pow(FragmentA,0.33333);
112
113 
114  if (OPTxs==0) {std::ostringstream errOs;
115    errOs << "We should'n be here (OPT =0) at evaporation cross section calculation (tritons)!!"  <<G4endl;
116    throw G4HadronicException(__FILE__, __LINE__, errOs.str());
117    return 0.;}
118  if( OPTxs==1 || OPTxs==2) return G4TritonEvaporationProbability::GetOpt12( K);
119  else if (OPTxs==3 || OPTxs==4)  return G4TritonEvaporationProbability::GetOpt34( K);
120  else{
121    std::ostringstream errOs;
122    errOs << "BAD Triton CROSS SECTION OPTION AT EVAPORATION!!"  <<G4endl;
123    throw G4HadronicException(__FILE__, __LINE__, errOs.str());
124    return 0.;
125  }
126}
127
128//
129//********************* OPT=1,2 : Chatterjee's cross section ************************
130//(fitting to cross section from Bechetti & Greenles OM potential)
131
132G4double G4TritonEvaporationProbability::GetOpt12(const  G4double K)
133{
134
135  G4double Kc=K;
136
137// JMQ xsec is set constat above limit of validity
138  if (K>50) Kc=50;
139
140 G4double landa ,mu ,nu ,p , Ec,q,r,ji,xs;
141//G4double Eo(0),epsilon1(0),epsilon2(0),discri(0);
142
143 
144 G4double    p0 = -11.04;
145 G4double    p1 = 619.1;
146 G4double    p2 = -2147.;
147 G4double    landa0 = -0.0426;
148 G4double    landa1 = -10.33;
149 G4double    mu0 = 601.9;
150 G4double    mu1 = 0.37;
151 G4double    nu0 = 583.0;
152 G4double    nu1 = -546.2;
153 G4double    nu2 = 1.718; 
154 G4double    delta=1.2;           
155
156 Ec = 1.44*theZ*ResidualZ/(1.5*ResidualAthrd+delta);
157 p = p0 + p1/Ec + p2/(Ec*Ec);
158 landa = landa0*ResidualA + landa1;
159 mu = mu0*std::pow(ResidualA,mu1);
160 nu = std::pow(ResidualA,mu1)*(nu0 + nu1*Ec + nu2*(Ec*Ec));
161 q = landa - nu/(Ec*Ec) - 2*p*Ec;
162 r = mu + 2*nu/Ec + p*(Ec*Ec);
163
164 ji=std::max(Kc,Ec);
165 if(Kc < Ec) { xs = p*Kc*Kc + q*Kc + r;}
166 else {xs = p*(Kc - ji)*(Kc - ji) + landa*Kc + mu + nu*(2 - Kc/ji)/ji ;}
167 
168 if (xs <0.0) {xs=0.0;}
169 
170 return xs;
171
172}
173
174// *********** OPT=3,4 : Kalbach's cross sections (from PRECO code)*************
175G4double G4TritonEvaporationProbability::GetOpt34(const  G4double K)
176//     ** t from o.m. of hafele, flynn et al
177{
178 
179  G4double landa, mu, nu, p , signor(1.),sig;
180  G4double ec,ecsq,xnulam,etest(0.),a; 
181  G4double b,ecut,cut,ecut2,geom,elab;
182 
183 
184  G4double     flow = 1.e-18;
185  G4double     spill= 1.e+18;
186
187  G4double     p0 = -21.45;
188  G4double     p1 = 484.7;
189  G4double     p2 = -1608.;
190  G4double     landa0 = 0.0186;
191  G4double     landa1 = -8.90;
192  G4double     mu0 = 686.3;
193  G4double     mu1 = 0.325;
194  G4double     nu0 = 368.9;
195  G4double     nu1 = -522.2;
196  G4double     nu2 = -4.998; 
197 
198  G4double      ra=0.80;
199       
200  ec = 1.44 * theZ * ResidualZ / (1.5*ResidualAthrd+ra);
201  ecsq = ec * ec;
202  p = p0 + p1/ec + p2/ecsq;
203  landa = landa0*ResidualA + landa1;
204  a = std::pow(ResidualA,mu1);
205  mu = mu0 * a;
206  nu = a* (nu0+nu1*ec+nu2*ecsq); 
207  xnulam = nu / landa;
208  if (xnulam > spill) xnulam=0.;
209  if (xnulam >= flow) etest = 1.2 *std::sqrt(xnulam);
210 
211  a = -2.*p*ec + landa - nu/ecsq;
212  b = p*ecsq + mu + 2.*nu/ec;
213  ecut = 0.;
214  cut = a*a - 4.*p*b;
215  if (cut > 0.) ecut = std::sqrt(cut);
216  ecut = (ecut-a) / (p+p);
217  ecut2 = ecut;
218  if (cut < 0.) ecut2 = ecut - 2.;
219  elab = K * FragmentA / ResidualA;
220  sig = 0.;
221 
222  if (elab <= ec) { //start for E<Ec
223    if (elab > ecut2)  sig = (p*elab*elab+a*elab+b) * signor;   
224  }           //end for E<Ec
225  else {           //start for E>Ec
226    sig = (landa*elab+mu+nu/elab) * signor;
227    geom = 0.;
228    if (xnulam < flow || elab < etest) return sig;
229    geom = std::sqrt(theA*K);
230    geom = 1.23*ResidualAthrd + ra + 4.573/geom;
231    geom = 31.416 * geom * geom;
232    sig = std::max(geom,sig);
233  }           //end for E>Ec
234  return sig;
235 
236}
237
238//   ************************** end of cross sections *******************************
239
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