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// Copyright (c) 2006 The Regents of the University of California.
// All rights reserved.
// UCRL-CODE-224807
//
//
// $Id: G4SmpNuDistDataU233_235_MC.cc,v 1.2 2007/06/01 13:46:53 gcosmo Exp $
//

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

G4int G4fissionEvent::G4SmpNuDistDataU233_235_MC(G4double nubar) {

/*
  Description
    Sample Number of Neutrons from fission in U-233 and U-235 using 
    Zucker and Holden's tabulated data for U-235
    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-235 data 
    from Zucker and Holden.
*/

/*
  Input
    nubar    - average number of neutrons per fission
  Output
    G4SmpNuDistDataU233_235_MC  - sampled multiplicity
    
*/

  static G4double U235nu [11] [8] = {
     {.0317223, .1717071, .3361991, .3039695, .1269459, .0266793, .0026322, .0001449},
     {.0237898, .1555525, .3216515, .3150433, .1444732, .0356013, .0034339, .0004546},
     {.0183989, .1384891, .3062123, .3217566, .1628673, .0455972, .0055694, .0011093},
     {.0141460, .1194839, .2883075, .3266568, .1836014, .0569113, .0089426, .0019504},
     {.0115208, .1032624, .2716849, .3283426, .2021206, .0674456, .0128924, .0027307},
     {.0078498, .0802010, .2456595, .3308175, .2291646, .0836912, .0187016, .0039148},
     {.0046272, .0563321, .2132296, .3290407, .2599806, .1045974, .0265604, .0056322},
     {.0024659, .0360957, .1788634, .3210507, .2892537, .1282576, .0360887, .0079244},
     {.0012702, .0216090, .1472227, .3083032, .3123950, .1522540, .0462449, .0107009},
     {.0007288, .0134879, .1231200, .2949390, .3258251, .1731879, .0551737, .0135376},
     {.0004373, .0080115, .1002329, .2779283, .3342611, .1966100, .0650090, .0175099}
    };
  static G4double U235nubar [11] = {
      2.4140000, 
      2.5236700, 
      2.6368200, 
      2.7623400, 
      2.8738400, 
      3.0386999, 
      3.2316099, 
      3.4272800, 
      3.6041900, 
      3.7395900, 
      3.8749800
    };
  G4double fraction, r, cum;
  G4int engind, nu;

/* 
  Check if nubar is within the range of experimental values
*/
  if(nubar >= U235nubar[0] && nubar <= U235nubar[10]) {
/*
     Use Zucker and Holden Data
*/
     engind = 1;
     while (nubar > U235nubar[engind]){ engind++;}
     fraction = (nubar-U235nubar[engind-1])/(U235nubar[engind]-U235nubar[engind-1]);
     if(fisslibrng() > fraction) engind--;

     r = fisslibrng();
     nu = 0;
     cum = U235nu[engind][0];
     while (r > cum && nu < 7){ 
       nu++;
       cum += U235nu[engind][nu];
     }
     return nu;
  } else {
/*
     Use Terrell's formula
*/
     return (G4int) G4SmpTerrell(nubar);
  }
}