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//J.M. Quesada (August2008). Based on:
//
// Hadronic Process: Nuclear De-excitations
// by V. Lara (Oct 1998)
//
// Modif (03 September 2008) by J. M. Quesada for external choice of inverse 
// cross section option


#include "G4DeuteronEvaporationProbability.hh"


G4DeuteronEvaporationProbability::G4DeuteronEvaporationProbability() :
    G4EvaporationProbability(2,1,3,&theCoulombBarrier) // A,Z,Gamma (fixed JMQ)
{    	}
G4DeuteronEvaporationProbability::G4DeuteronEvaporationProbability(const G4DeuteronEvaporationProbability &) : G4EvaporationProbability()
{
    throw G4HadronicException(__FILE__, __LINE__, "G4DeuteronEvaporationProbability::copy_constructor meant to not be accessable");
}


const G4DeuteronEvaporationProbability & G4DeuteronEvaporationProbability::
operator=(const G4DeuteronEvaporationProbability &)
{
    throw G4HadronicException(__FILE__, __LINE__, "G4DeuteronEvaporationProbability::operator= meant to not be accessable");
    return *this;
}


G4bool G4DeuteronEvaporationProbability::operator==(const G4DeuteronEvaporationProbability &) const
{
    return false;
}


G4bool G4DeuteronEvaporationProbability::operator!=(const G4DeuteronEvaporationProbability &) const
{
    return true;
}


G4double G4DeuteronEvaporationProbability::CalcAlphaParam(const G4Fragment & fragment) 
{
    return 1.0 + CCoeficient(static_cast<G4double>(fragment.GetZ()-GetZ()));
}


G4double G4DeuteronEvaporationProbability::CalcBetaParam(const G4Fragment & ) 
{
    return 0.0;
}


G4double G4DeuteronEvaporationProbability::CCoeficient(const G4double aZ) 
{
    // Data comes from 
    // Dostrovsky, Fraenkel and Friedlander
    // Physical Review, vol 116, num. 3 1959
    // 
    // const G4int size = 5;
    // G4double Zlist[5] = { 10.0, 20.0, 30.0, 50.0, 70.0};
    // G4double Cp[5] = { 0.50, 0.28, 0.20, 0.15, 0.10};
    // C for deuteron is equal to C for protons divided by 2
    G4double C = 0.0;
	
    if (aZ >= 70) {
	C = 0.10;
    } else {
	C = ((((0.15417e-06*aZ) - 0.29875e-04)*aZ + 0.21071e-02)*aZ - 0.66612e-01)*aZ + 0.98375;
    }
	
    return C/2.0;
	
}


///////////////////////////////////////////////////////////////////////////////////
//J. M. Quesada (Dec 2007-June 2008): New inverse reaction cross sections 
//OPT=0 Dostrovski's parameterization
//OPT=1,2 Chatterjee's paramaterization 
//OPT=3,4 Kalbach's parameterization 
// 
G4double G4DeuteronEvaporationProbability::CrossSection(const  G4Fragment & fragment, const  G4double K)
{
       theA=GetA();
       theZ=GetZ();
       ResidualA=fragment.GetA()-theA;
       ResidualZ=fragment.GetZ()-theZ; 
 
       ResidualAthrd=std::pow(ResidualA,0.33333);
       FragmentA=fragment.GetA();
       FragmentAthrd=std::pow(FragmentA,0.33333);

       if (OPTxs==0) {std::ostringstream errOs;
         errOs << "We should'n be here (OPT =0) at evaporation cross section calculation (deuterons)!!"  <<G4endl;
         throw G4HadronicException(__FILE__, __LINE__, errOs.str());
         return 0.;}
       if( OPTxs==1 || OPTxs==2) return G4DeuteronEvaporationProbability::GetOpt12( K);
       else if (OPTxs==3 || OPTxs==4)  return G4DeuteronEvaporationProbability::GetOpt34( K);
       else{
         std::ostringstream errOs;
         errOs << "BAD Deuteron CROSS SECTION OPTION AT EVAPORATION!!"  <<G4endl;
         throw G4HadronicException(__FILE__, __LINE__, errOs.str());
         return 0.;
       }
}


//********************* OPT=1,2 : Chatterjee's cross section ************************ 
//(fitting to cross section from Bechetti & Greenles OM potential)

G4double G4DeuteronEvaporationProbability::GetOpt12(const  G4double K)
{

  G4double Kc=K;

// JMQ xsec is set constat above limit of validity
 if (K>50) Kc=50;

 G4double landa ,mu ,nu ,p , Ec,q,r,ji,xs;

 
 G4double    p0 = -38.21;
 G4double    p1 = 922.6;
 G4double    p2 = -2804.;
 G4double    landa0 = -0.0323;
 G4double    landa1 = -5.48;
 G4double    mu0 = 336.1;
 G4double    mu1 = 0.48;
 G4double    nu0 = 524.3;
 G4double    nu1 = -371.8;
 G4double    nu2 = -5.924;  
 G4double    delta=1.2;            
 

 Ec = 1.44*theZ*ResidualZ/(1.5*ResidualAthrd+delta);
 p = p0 + p1/Ec + p2/(Ec*Ec);
 landa = landa0*ResidualA + landa1;
 mu = mu0*std::pow(ResidualA,mu1);
 nu = std::pow(ResidualA,mu1)*(nu0 + nu1*Ec + nu2*(Ec*Ec));
 q = landa - nu/(Ec*Ec) - 2*p*Ec;
 r = mu + 2*nu/Ec + p*(Ec*Ec);
 
 ji=std::max(Kc,Ec);
 if(Kc < Ec) { xs = p*Kc*Kc + q*Kc + r;}
 else {xs = p*(Kc - ji)*(Kc - ji) + landa*Kc + mu + nu*(2 - Kc/ji)/ji ;}
                 
 if (xs <0.0) {xs=0.0;}
 
 return xs;

}


// *********** OPT=3,4 : Kalbach's cross sections (from PRECO code)*************
G4double G4DeuteronEvaporationProbability::GetOpt34(const  G4double K)
//     ** d from o.m. of perey and perey
{

  G4double landa, mu, nu, p , signor(1.),sig;
  G4double ec,ecsq,xnulam,etest(0.),a; 
  G4double b,ecut,cut,ecut2,geom,elab;


  G4double     flow = 1.e-18;
  G4double     spill= 1.e+18;


  G4double     p0 = 0.798;
  G4double     p1 = 420.3;
  G4double     p2 = -1651.;
  G4double     landa0 = 0.00619;
  G4double     landa1 = -7.54;
  G4double     mu0 = 583.5;
  G4double     mu1 = 0.337;
  G4double     nu0 = 421.8;
  G4double     nu1 = -474.5;
  G4double     nu2 = -3.592;      
  
  G4double      ra=0.80;
        
  //JMQ 13/02/09 increase of reduced radius to lower the barrier
  //  ec = 1.44 * theZ * ResidualZ / (1.5*ResidualAthrd+ra);
   ec = 1.44 * theZ * ResidualZ / (1.7*ResidualAthrd+ra);

  ecsq = ec * ec;
  p = p0 + p1/ec + p2/ecsq;
  landa = landa0*ResidualA + landa1;
  a = std::pow(ResidualA,mu1);
  mu = mu0 * a;
  nu = a* (nu0+nu1*ec+nu2*ecsq);  
  xnulam = nu / landa;
  if (xnulam > spill) xnulam=0.;
  if (xnulam >= flow) etest = 1.2 *std::sqrt(xnulam);

  a = -2.*p*ec + landa - nu/ecsq;
  b = p*ecsq + mu + 2.*nu/ec;
  ecut = 0.;
  cut = a*a - 4.*p*b;
  if (cut > 0.) ecut = std::sqrt(cut);
  ecut = (ecut-a) / (p+p);
  ecut2 = ecut;
//JMQ 290310 for avoiding unphysical increase below minimum (at ecut)
//ecut<0 means that there is no cut with energy axis, i.e. xs is set to 0 bellow minimum
//  if (cut < 0.) ecut2 = ecut - 2.;
  if (cut < 0.) ecut2 = ecut;
  elab = K * FragmentA / ResidualA;
  sig = 0.;

  if (elab <= ec) { //start for E<Ec
    if (elab > ecut2)  sig = (p*elab*elab+a*elab+b) * signor;
  }           //end for E<Ec
  else {           //start for E>Ec
    sig = (landa*elab+mu+nu/elab) * signor;
    geom = 0.;
    if (xnulam < flow || elab < etest) return sig;
    geom = std::sqrt(theA*K);
    geom = 1.23*ResidualAthrd + ra + 4.573/geom;
    geom = 31.416 * geom * geom;
    sig = std::max(geom,sig);
  }           //end for E>Ec
  return sig;
  
}

//   ************************** end of cross sections ******************************* 
