source: trunk/source/processes/hadronic/models/pre_equilibrium/exciton_model/src/G4PreCompoundTriton.cc @ 1228

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update geant4.9.3 tag
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27// $Id: G4PreCompoundTriton.cc,v 1.5 2009/02/13 18:57:32 vnivanch Exp $
28// GEANT4 tag $Name: geant4-09-03 $
29//
30// -------------------------------------------------------------------
31//
32// GEANT4 Class file
33//
34//
35// File name:     G4PreCompoundTriton
36//
37// Author:         V.Lara
38//
39// Modified: 
40// 21.08.2008 J. M. Quesada add choice of options 
41// 10.02.2009 J. M. Quesada set default opt1 
42//
43 
44#include "G4PreCompoundTriton.hh"
45
46
47G4ReactionProduct * G4PreCompoundTriton::GetReactionProduct() const
48{
49  G4ReactionProduct * theReactionProduct =
50    new G4ReactionProduct(G4Triton::TritonDefinition());
51  theReactionProduct->SetMomentum(GetMomentum().vect());
52  theReactionProduct->SetTotalEnergy(GetMomentum().e());
53#ifdef PRECOMPOUND_TEST
54  theReactionProduct->SetCreatorModel("G4PrecompoundModel");
55#endif
56  return theReactionProduct;
57}   
58
59G4double G4PreCompoundTriton::FactorialFactor(const G4double N, const G4double P)
60{
61  return 
62      (N-3.0)*(P-2.0)*(
63                       (((N-2.0)*(P-1.0))/2.0) *(
64                                                 (((N-1.0)*P)/3.0) 
65                                                 )
66                       );
67}
68 
69G4double G4PreCompoundTriton::CoalescenceFactor(const G4double A)
70{
71  return 243.0/(A*A);
72}   
73
74G4double G4PreCompoundTriton::GetRj(const G4int NumberParticles, const G4int NumberCharged)
75{
76  G4double rj = 0.0;
77  G4double denominator = NumberParticles*(NumberParticles-1)*(NumberParticles-2);
78  if(NumberCharged >= 1 && (NumberParticles-NumberCharged) >= 2) {
79    rj = 3.0*static_cast<G4double>(NumberCharged*(NumberParticles-NumberCharged)*(NumberParticles-NumberCharged-1))
80      /static_cast<G4double>(denominator); 
81  }
82  return rj;
83}
84
85////////////////////////////////////////////////////////////////////////////////////
86//J. M. Quesada (Dec 2007-June 2008): New inverse reaction cross sections
87//OPT=0 Dostrovski's parameterization
88//OPT=1,2 Chatterjee's paramaterization
89//OPT=3,4 Kalbach's parameterization
90//
91G4double G4PreCompoundTriton::CrossSection(const  G4double K)
92{
93  ResidualA=GetRestA();
94  ResidualZ=GetRestZ(); 
95  theA=GetA();
96  theZ=GetZ();
97  ResidualAthrd=std::pow(ResidualA,0.33333);
98  FragmentA=GetA()+GetRestA();
99  FragmentAthrd=std::pow(FragmentA,0.33333);
100
101  if (OPTxs==0) return GetOpt0( K);
102  else if( OPTxs==1 || OPTxs==2) return GetOpt12( K);
103  else if (OPTxs==3 || OPTxs==4)  return GetOpt34( K);
104  else{
105    std::ostringstream errOs;
106    errOs << "BAD TRITON CROSS SECTION OPTION !!"  <<G4endl;
107    throw G4HadronicException(__FILE__, __LINE__, errOs.str());
108    return 0.;
109  }
110}
111
112// *********************** OPT=0 : Dostrovski's cross section  *****************************
113
114G4double G4PreCompoundTriton::GetOpt0(const  G4double K)
115{
116  const G4double r0 = G4PreCompoundParameters::GetAddress()->Getr0();
117  // cross section is now given in mb (r0 is in mm) for the sake of consistency
118  //with the rest of the options
119  return 1.e+25*pi*(r0*ResidualAthrd)*(r0*ResidualAthrd)*GetAlpha()*(1.+GetBeta()/K);
120}
121//
122//---------
123//
124G4double G4PreCompoundTriton::GetAlpha()
125{
126  G4double C = 0.0;
127  G4double aZ = GetZ() + GetRestZ();
128  if (aZ >= 70) 
129    {
130      C = 0.10;
131    } 
132  else 
133    {
134      C = ((((0.15417e-06*aZ) - 0.29875e-04)*aZ + 0.21071e-02)*aZ - 0.66612e-01)*aZ + 0.98375; 
135    }
136 
137  return 1.0 + C/3.0;
138}
139//
140//-------------
141//
142G4double G4PreCompoundTriton::GetBeta() 
143{
144  return -GetCoulombBarrier();
145}
146//
147//********************* OPT=1,2 : Chatterjee's cross section ************************
148//(fitting to cross section from Bechetti & Greenles OM potential)
149
150G4double G4PreCompoundTriton::GetOpt12(const  G4double K)
151{
152
153  G4double Kc=K;
154
155  // JMQ xsec is set constat above limit of validity
156  if (K>50) Kc=50;
157
158  G4double landa ,mu ,nu ,p , Ec,q,r,ji,xs;
159 
160  G4double    p0 = -11.04;
161  G4double    p1 = 619.1;
162  G4double    p2 = -2147.;
163  G4double    landa0 = -0.0426;
164  G4double    landa1 = -10.33;
165  G4double    mu0 = 601.9;
166  G4double    mu1 = 0.37;
167  G4double    nu0 = 583.0;
168  G4double    nu1 = -546.2;
169  G4double    nu2 = 1.718; 
170  G4double    delta=1.2;           
171
172  Ec = 1.44*theZ*ResidualZ/(1.5*ResidualAthrd+delta);
173  p = p0 + p1/Ec + p2/(Ec*Ec);
174  landa = landa0*ResidualA + landa1;
175  mu = mu0*std::pow(ResidualA,mu1);
176  nu = std::pow(ResidualA,mu1)*(nu0 + nu1*Ec + nu2*(Ec*Ec));
177  q = landa - nu/(Ec*Ec) - 2*p*Ec;
178  r = mu + 2*nu/Ec + p*(Ec*Ec);
179 
180  ji=std::max(Kc,Ec);
181  if(Kc < Ec) { xs = p*Kc*Kc + q*Kc + r;}
182  else {xs = p*(Kc - ji)*(Kc - ji) + landa*Kc + mu + nu*(2 - Kc/ji)/ji ;}
183                 
184  if (xs <0.0) {xs=0.0;}
185             
186  return xs;
187
188}
189
190// *********** OPT=3,4 : Kalbach's cross sections (from PRECO code)*************
191G4double G4PreCompoundTriton::GetOpt34(const  G4double K)
192//     ** t from o.m. of hafele, flynn et al
193{
194
195  G4double landa, mu, nu, p , signor(1.),sig;
196  G4double ec,ecsq,xnulam,etest(0.),a; 
197  G4double b,ecut,cut,ecut2,geom,elab;
198
199
200  G4double     flow = 1.e-18;
201  G4double     spill= 1.e+18;
202
203
204  G4double     p0 = -21.45;
205  G4double     p1 = 484.7;
206  G4double     p2 = -1608.;
207  G4double     landa0 = 0.0186;
208  G4double     landa1 = -8.90;
209  G4double     mu0 = 686.3;
210  G4double     mu1 = 0.325;
211  G4double     nu0 = 368.9;
212  G4double     nu1 = -522.2;
213  G4double     nu2 = -4.998; 
214 
215  G4double      ra=0.80;
216       
217  //JMQ 13/02/09 increase of reduced radius to lower the barrier
218  // ec = 1.44 * theZ * ResidualZ / (1.5*ResidualAthrd+ra);
219  ec = 1.44 * theZ * ResidualZ / (1.7*ResidualAthrd+ra);
220  ecsq = ec * ec;
221  p = p0 + p1/ec + p2/ecsq;
222  landa = landa0*ResidualA + landa1;
223  a = std::pow(ResidualA,mu1);
224  mu = mu0 * a;
225  nu = a* (nu0+nu1*ec+nu2*ecsq); 
226  xnulam = nu / landa;
227  if (xnulam > spill) xnulam=0.;
228  if (xnulam >= flow) etest = 1.2 *std::sqrt(xnulam);
229 
230  a = -2.*p*ec + landa - nu/ecsq;
231  b = p*ecsq + mu + 2.*nu/ec;
232  ecut = 0.;
233  cut = a*a - 4.*p*b;
234  if (cut > 0.) ecut = std::sqrt(cut);
235  ecut = (ecut-a) / (p+p);
236  ecut2 = ecut;
237  if (cut < 0.) ecut2 = ecut - 2.;
238  elab = K * FragmentA / ResidualA;
239  sig = 0.;
240 
241  if (elab <= ec) { //start for E<Ec
242    if (elab > ecut2)  sig = (p*elab*elab+a*elab+b) * signor;
243  }           //end for E<Ec
244  else {           //start for E>Ec
245    sig = (landa*elab+mu+nu/elab) * signor;
246    geom = 0.;
247    if (xnulam < flow || elab < etest) return sig;
248    geom = std::sqrt(theA*K);
249    geom = 1.23*ResidualAthrd + ra + 4.573/geom;
250    geom = 31.416 * geom * geom;
251    sig = std::max(geom,sig);
252  }           //end for E>Ec
253  return sig;
254
255}
256
257//   ************************** end of cross sections *******************************
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