G4SmpNuDistDataU232_234_236_238_MC.cc

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// $Id: G4SmpNuDistDataU232_234_236_238_MC.cc 68799 2013-04-05 13:29:46Z gcosmo $
//

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

G4int G4fissionEvent::G4SmpNuDistDataU232_234_236_238_MC(G4double nubar) {

/*
  Description
    Sample Number of Neutrons from fission in U-232, U-234, U-236, 
    and U-238 using Zucker and Holden's tabulated data for U-238
    The 11 P(nu) distributions are given as a function of nubar, 
    the average number of neutrons from induced fission for the 
    11 different energies (0 to 10 MeV), based on the U-238 data 
    from Zucker and Holden.
*/

/*
  Input
    nubar    - average number of neutrons per fission
  Output
    G4SmpNuDistDataU232_234_236_238_MC  - sampled multiplicity
    
*/

  static G4double U238nu [11] [9] = {
     {.0396484, .2529541, .2939544, .2644470, .1111758, .0312261, .0059347, .0005436, .0001158},
     {.0299076, .2043215, .2995886, .2914889, .1301480, .0363119, .0073638, .0006947, .0001751},
     {.0226651, .1624020, .2957263, .3119098, .1528786, .0434233, .0097473, .0009318, .0003159},
     {.0170253, .1272992, .2840540, .3260192, .1779579, .0526575, .0130997, .0013467, .0005405},
     {.0124932, .0984797, .2661875, .3344938, .2040116, .0640468, .0173837, .0020308, .0008730},
     {.0088167, .0751744, .2436570, .3379711, .2297901, .0775971, .0225619, .0030689, .0013626},
     {.0058736, .0565985, .2179252, .3368863, .2541575, .0933127, .0286200, .0045431, .0031316},
     {.0035997, .0420460, .1904095, .3314575, .2760413, .1112075, .0355683, .0065387, .0031316},
     {.0019495, .0309087, .1625055, .3217392, .2943792, .1313074, .0434347, .0091474, .0046284},
     {.0008767, .0226587, .1356058, .3076919, .3080816, .1536446, .0522549, .0124682, .0067176},
     {.0003271, .0168184, .1111114, .2892434, .3160166, .1782484, .0620617, .0166066, .0095665}
    };
  static G4double U238nubar [11] = {
      2.2753781,
      2.4305631,
      2.5857481,
      2.7409331,
      2.8961181,
      3.0513031,
      3.2064881,
      3.3616731,
      3.5168581,
      3.6720432,
      3.8272281
    };
  G4double fraction, r, cum;
  G4int engind, nu;

/* 
  Check if nubar is within the range of experimental values
*/
  if(nubar >= U238nubar[0] && nubar <= U238nubar[10]) {
/*
     Use Zucker and Holden Data
*/
     engind = 1;
     while (nubar > U238nubar[engind]){ engind++;}
     fraction = (nubar-U238nubar[engind-1])/(U238nubar[engind]-U238nubar[engind-1]);
     if(fisslibrng() > fraction) engind--;

     r = fisslibrng();
     nu = 0;
     cum = U238nu[engind][0];
     while (r > cum && nu < 8){ 
       nu++;
       cum += U238nu[engind][nu];
     }
     return nu;
  } else {
/*
     Use Terrell's formula
*/
     return (G4int) G4SmpTerrell(nubar);
  }
}