G4SmpNuDistDataPu239.cc

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// $Id: G4SmpNuDistDataPu239.cc 67966 2013-03-13 09:38:38Z gcosmo $
//

#include <cmath>
#include "G4fissionEvent.hh"

G4int G4fissionEvent::G4SmpNuDistDataPu239(G4double erg) {

/*
  Description
    Sample Number of Neutrons from fission in Pu-239 using 
    Zucker and Holden's tabulated data for Pu-239
*/

/*
  Input
    erg      - incident neutron energy
  Output
    G4SmpNuDistDataPu239  - sampled multiplicity
    
*/
 
  G4double cpnu;
  G4double pnu[8] = {0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0};
  G4double eng;
  G4double r;

/* 
  Check if energy is within the range of experimental values
*/
  if (erg > 10) eng=10.;
  else eng=erg;

  r=fisslibrng();

/*
  Pu-239 nu distribution
*/
  if (eng <= 5.0) pnu[0] = 0.0108826e0 - 0.00207694e0*eng 
                         - 6.5e-4*std::pow(eng,2) + 4.023e-4*std::pow(eng,3)
                         - 7.93e-5*std::pow(eng,4) + 5.53666667e-6*std::pow(eng,5);       
  if (eng > 5 && eng <= 10) pnu[0] = 0.078606e0 - 5.17531e-2*eng 
                                   + 1.42034e-2*std::pow(eng,2) - 1.96292e-3*std::pow(eng,3)
                                   + 1.34512e-4*std::pow(eng,4) - 3.63416e-6*std::pow(eng,5);
  if (r <= pnu[0]) return 0;


  if (eng <= 5.0) pnu[1] = 0.0994916e0 - 0.01979542e0*eng 
                         - 0.00236583e0*std::pow(eng,2) + 0.0020581e0*std::pow(eng,3)
                         - 4.14016667e-4*std::pow(eng,4) + 2.85666667e-5*std::pow(eng,5);
  if (eng > 5 && eng <= 10) pnu[1] = 0.10052e0 - 2.61361e-2*eng 
                                   + 3.78355e-3*std::pow(eng,2) - 3.70667e-4*std::pow(eng,3) 
                                   + 1.95458e-5*std::pow(eng,4) - 3.87499e-7*std::pow(eng,5);
  cpnu=pnu[0]+pnu[1];
  if (r <= cpnu) return 1;


  if (eng <= 5.0) pnu[2] = 0.2748898e0 - 0.01565248e0*eng 
                         - 0.00749681e0*std::pow(eng,2) + 0.00217121e0*std::pow(eng,3)
                         - 3.13041667e-4*std::pow(eng,4) + 1.88183333e-5*std::pow(eng,5);
  if (eng > 5 && eng <= 10) pnu[2] = 0.282487e0 - 0.0261342e0*eng 
                                   - 1.16895e-3*std::pow(eng,2) + 1.9888e-4*std::pow(eng,3)
                                   - 6.41257e-6*std::pow(eng,4) + 1.02502e-7*std::pow(eng,5);
  cpnu=cpnu+pnu[2];
  if (r <= cpnu) return 2;

  if (eng <= 5.0) pnu[3] = 0.3269196e0 + 0.00428312e0*eng 
                         - 0.00189322e0*std::pow(eng,2) - 4.31925001e-4*std::pow(eng,3)
                         + 1.18466667e-4*std::pow(eng,4) - 9.04166668e-6*std::pow(eng,5);
  if (eng > 5 && eng <= 10) pnu[3] = 0.329058e0 + 4.023e-3*eng
                                   - 3.06402e-3*std::pow(eng,2) + 2.2628e-4*std::pow(eng,3)
                                   - 1.50875e-5*std::pow(eng,4) + 4.39168e-7*std::pow(eng,5);
  cpnu=cpnu+pnu[3];
  if (r <= cpnu) return 3;

  if (eng <= 5.0) pnu[4] = 0.2046061e0 + 0.02633899e0*eng
                         + 0.0041514e0*std::pow(eng,2) - 0.00275542e0*std::pow(eng,3)
                         + 5.0325e-4*std::pow(eng,4) - 3.32158333e-5*std::pow(eng,5);
  if (eng > 5 && eng <= 10) pnu[4] = 0.18992e0 + 4.55188e-2*eng
                                   - 7.06316e-3*std::pow(eng,2) + 7.29916e-4*std::pow(eng,3)
                                   - 4.71791e-5*std::pow(eng,4) + 1.185e-6*std::pow(eng,5);
  cpnu=cpnu+pnu[4];
  if (r <= cpnu) return 4;

  if (eng <= 5.0) pnu[5] = 0.0726834e0 + 0.00116043e0*eng
                         + 0.007572e0*std::pow(eng,2) - 0.00161972e0*std::pow(eng,3)
                         + 2.3545e-4*std::pow(eng,4) - 1.546e-5*std::pow(eng,5);
  if (eng > 5 && eng <= 10) pnu[5] = 0.0779212e0 - 1.35849e-3*eng
                                   + 6.68583e-3*std::pow(eng,2) - 7.98649e-4*std::pow(eng,3)
                                   + 4.88625e-5*std::pow(eng,4) - 1.54167e-6*std::pow(eng,5);
  cpnu=cpnu+pnu[5];
  if (r <= cpnu) return 5;

  if (eng <= 5.0) pnu[6] = 0.0097282e0 + 0.00494589e0*eng
                         + 0.00115294e0*std::pow(eng,2) - 3.25191667e-4*std::pow(eng,3)
                         + 6.00083333e-5*std::pow(eng,4) - 3.745e-6*std::pow(eng,5);
  if (eng > 5 && eng <= 10) pnu[6] = 7.85432e-3 + 7.33182e-3*eng
                                   - 2.03705e-4*std::pow(eng,2) + 8.73787e-5*std::pow(eng,3)
                                   - 4.24164e-6*std::pow(eng,4) + 2.37499e-7*std::pow(eng,5);
  cpnu=cpnu+pnu[6];
  if (r <= cpnu) return 6;

  if (eng <= 5.0) pnu[7] = 6.301e-4 + 1.10666667e-4*eng
                         + 4.28016667e-4*std::pow(eng,2) + 1.12041667e-5*std::pow(eng,3)
                         - 4.31666667e-6*std::pow(eng,4) + 3.29166667e-7*std::pow(eng,5);
  if (eng > 5 && eng <= 10) pnu[7] = 1.5323e-3 - 7.91857e-4*eng
                                   + 8.01017e-4*std::pow(eng,2) - 6.82833e-5*std::pow(eng,3)
                                   + 4.38333e-6*std::pow(eng,4) - 6.0e-8*std::pow(eng,5);
  cpnu=cpnu+pnu[7];
  if (r <= cpnu) return 7;
  else return 8;
}