source: trunk/source/processes/hadronic/models/pre_equilibrium/exciton_model/src/G4PreCompoundDeuteron.cc @ 1228

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update geant4.9.3 tag
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26// $Id: G4PreCompoundDeuteron.cc,v 1.5 2009/02/13 18:57:32 vnivanch Exp $
27// GEANT4 tag $Name: geant4-09-03 $
28//
29// -------------------------------------------------------------------
30//
31// GEANT4 Class file
32//
33//
34// File name:     G4PreCompoundDeuteron
35//
36// Author:         V.Lara
37//
38// Modified: 
39// 21.08.2008 J. M. Quesada add choice of options 
40// 10.02.2009 J. M. Quesada set default opt1 
41//
42
43#include "G4PreCompoundDeuteron.hh"
44
45G4ReactionProduct * G4PreCompoundDeuteron::GetReactionProduct() const
46{
47  G4ReactionProduct * theReactionProduct =
48    new G4ReactionProduct(G4Deuteron::DeuteronDefinition());
49  theReactionProduct->SetMomentum(GetMomentum().vect());
50  theReactionProduct->SetTotalEnergy(GetMomentum().e());
51#ifdef PRECOMPOUND_TEST
52  theReactionProduct->SetCreatorModel("G4PrecompoundModel");
53#endif
54  return theReactionProduct;
55}   
56
57 
58G4double G4PreCompoundDeuteron::FactorialFactor(const G4double N, const G4double P)
59{
60  return (N-1.0)*(N-2.0)*(P-1.0)*P/2.0;
61}
62 
63G4double G4PreCompoundDeuteron::CoalescenceFactor(const G4double A)
64{
65  return 16.0/A;
66}   
67
68G4double G4PreCompoundDeuteron::GetRj(const G4int NumberParticles, const G4int NumberCharged)
69{
70  G4double rj = 0.0;
71  G4double denominator = NumberParticles*(NumberParticles-1);
72  if(NumberCharged >=1 && (NumberParticles-NumberCharged) >=1) {
73    rj = 2.0*static_cast<G4double>(NumberCharged*(NumberParticles-NumberCharged))
74      / static_cast<G4double>(denominator); 
75  }
76  return rj;
77}
78
79////////////////////////////////////////////////////////////////////////////////////
80//J. M. Quesada (Dec 2007-June 2008): New inverse reaction cross sections
81//OPT=0 Dostrovski's parameterization
82//OPT=1,2 Chatterjee's paramaterization
83//OPT=3,4 Kalbach's parameterization
84//
85G4double G4PreCompoundDeuteron::CrossSection(const  G4double K)
86{
87
88  ResidualA=GetRestA();
89  ResidualZ=GetRestZ(); 
90  theA=GetA();
91  theZ=GetZ();
92  ResidualAthrd=std::pow(ResidualA,0.33333);
93  FragmentA=GetA()+GetRestA();
94  FragmentAthrd=std::pow(FragmentA,0.33333);
95
96
97  if (OPTxs==0) return GetOpt0( K);
98  else if( OPTxs==1 || OPTxs==2) return GetOpt12( K);
99  else if (OPTxs==3 || OPTxs==4)  return GetOpt34( K);
100  else{
101    std::ostringstream errOs;
102    errOs << "BAD DEUTERON CROSS SECTION OPTION !!"  <<G4endl;
103    throw G4HadronicException(__FILE__, __LINE__, errOs.str());
104    return 0.;
105  }
106}
107
108// *********************** OPT=0 : Dostrovski's cross section  *****************************
109
110G4double G4PreCompoundDeuteron::GetOpt0(const  G4double K)
111{
112  const G4double r0 = G4PreCompoundParameters::GetAddress()->Getr0();
113  // cross section is now given in mb (r0 is in mm) for the sake of consistency
114  //with the rest of the options
115  return 1.e+25*pi*(r0*ResidualAthrd)*(r0*ResidualAthrd)*GetAlpha()*(1.+GetBeta()/K);
116}
117//
118//---------
119//
120G4double G4PreCompoundDeuteron::GetAlpha()
121{
122  G4double C = 0.0;
123  G4double aZ = GetZ() + GetRestZ();
124  if (aZ >= 70) 
125    {
126      C = 0.10;
127    } 
128  else 
129    {
130      C = ((((0.15417e-06*aZ) - 0.29875e-04)*aZ + 0.21071e-02)*aZ - 0.66612e-01)*aZ + 0.98375; 
131    }
132  return 1.0 + C/2.0;
133}
134//
135//---------
136//
137G4double G4PreCompoundDeuteron::GetBeta() 
138{
139  return -GetCoulombBarrier();
140}
141//
142//********************* OPT=1,2 : Chatterjee's cross section ************************
143//(fitting to cross section from Bechetti & Greenles OM potential)
144
145G4double G4PreCompoundDeuteron::GetOpt12(const  G4double K)
146{
147
148  G4double Kc=K;
149
150// JMQ xsec is set constat above limit of validity
151  if (K>50) Kc=50;
152
153  G4double landa ,mu ,nu ,p , Ec,q,r,ji,xs;
154  //G4double Eo(0),epsilon1(0),epsilon2(0),discri(0);
155
156 
157  G4double    p0 = -38.21;
158  G4double    p1 = 922.6;
159  G4double    p2 = -2804.;
160  G4double    landa0 = -0.0323;
161  G4double    landa1 = -5.48;
162  G4double    mu0 = 336.1;
163  G4double    mu1 = 0.48;
164  G4double    nu0 = 524.3;
165  G4double    nu1 = -371.8;
166  G4double    nu2 = -5.924; 
167  G4double    delta=1.2;           
168 
169
170  Ec = 1.44*theZ*ResidualZ/(1.5*ResidualAthrd+delta);
171  p = p0 + p1/Ec + p2/(Ec*Ec);
172  landa = landa0*ResidualA + landa1;
173  mu = mu0*std::pow(ResidualA,mu1);
174  nu = std::pow(ResidualA,mu1)*(nu0 + nu1*Ec + nu2*(Ec*Ec));
175  q = landa - nu/(Ec*Ec) - 2*p*Ec;
176  r = mu + 2*nu/Ec + p*(Ec*Ec);
177
178  ji=std::max(Kc,Ec);
179  if(Kc < Ec) { xs = p*Kc*Kc + q*Kc + r;}
180  else {xs = p*(Kc - ji)*(Kc - ji) + landa*Kc + mu + nu*(2 - Kc/ji)/ji ;}
181                 
182  if (xs <0.0) {xs=0.0;}
183             
184  return xs;
185
186}
187
188// *********** OPT=3,4 : Kalbach's cross sections (from PRECO code)*************
189G4double G4PreCompoundDeuteron::GetOpt34(const  G4double K)
190//     ** d from o.m. of perey and perey
191{
192
193  G4double landa, mu, nu, p ,signor(1.),sig;
194  G4double ec,ecsq,xnulam,etest(0.),a; 
195  G4double b,ecut,cut,ecut2,geom,elab;
196
197  G4double     flow = 1.e-18;
198  G4double     spill= 1.e+18;
199
200 
201
202  G4double     p0 = 0.798;
203  G4double     p1 = 420.3;
204  G4double     p2 = -1651.;
205  G4double     landa0 = 0.00619;
206  G4double     landa1 = -7.54;
207  G4double     mu0 = 583.5;
208  G4double     mu1 = 0.337;
209  G4double     nu0 = 421.8;
210  G4double     nu1 = -474.5;
211  G4double     nu2 = -3.592;     
212 
213
214  G4double     ra=0.80;
215       
216  //JMQ 13/02/09 increase of reduced radius to lower the barrier
217  // ec = 1.44 * theZ * ResidualZ / (1.5*ResidualAthrd+ra);
218  ec = 1.44 * theZ * ResidualZ / (1.7*ResidualAthrd+ra);
219  ecsq = ec * ec;
220  p = p0 + p1/ec + p2/ecsq;
221  landa = landa0*ResidualA + landa1;
222  a = std::pow(ResidualA,mu1);
223  mu = mu0 * a;
224  nu = a* (nu0+nu1*ec+nu2*ecsq); 
225  xnulam = nu / landa;
226  if (xnulam > spill) xnulam=0.;
227  if (xnulam >= flow) etest = 1.2 *std::sqrt(xnulam);
228
229  a = -2.*p*ec + landa - nu/ecsq;
230  b = p*ecsq + mu + 2.*nu/ec;
231  ecut = 0.;
232  cut = a*a - 4.*p*b;
233  if (cut > 0.) ecut = std::sqrt(cut);
234  ecut = (ecut-a) / (p+p);
235  ecut2 = ecut;
236  if (cut < 0.) ecut2 = ecut - 2.;
237  elab = K * FragmentA / ResidualA;
238  sig = 0.;
239
240  if (elab <= ec) { //start for E<Ec
241    if (elab > ecut2)  sig = (p*elab*elab+a*elab+b) * signor;
242  }           //end for E<Ec
243  else {           //start for E>Ec
244    sig = (landa*elab+mu+nu/elab) * signor;
245    geom = 0.;
246    if (xnulam < flow || elab < etest) return sig;
247    geom = std::sqrt(theA*K);
248    geom = 1.23*ResidualAthrd + ra + 4.573/geom;
249    geom = 31.416 * geom * geom;
250    sig = std::max(geom,sig);
251  }           //end for E>Ec
252  return sig;
253
254}
255
256//   ************************** end of cross sections *******************************
257
258
259
260
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