G4SmpNuDistDataPu239_241_MC.cc

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// Copyright (c) 2006 The Regents of the University of California.
// All rights reserved.
// UCRL-CODE-224807
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// $Id$
//
 
#include <cmath>
#include "G4fissionEvent.hh"
 
G4int G4fissionEvent::G4SmpNuDistDataPu239_241_MC(G4double nubar) {
 
/*
  Description
    Sample Number of Neutrons from fission in Pu-239 and Pu-241 using 
    Zucker and Holden's tabulated data for Pu-239
    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 Pu-239 data 
    from Zucker and Holden.
*/
 
/*
  Input
    nubar    - average number of neutrons per fission
  Output
    G4SmpNuDistDataPu239_241_MC  - sampled multiplicity
    
*/
 
  static G4double Pu239nu [11] [9] = {
     {.0108826, .0994916, .2748898, .3269196, .2046061, .0726834, .0097282, .0006301, .0001685},
     {.0084842, .0790030, .2536175, .3289870, .2328111, .0800161, .0155581, .0011760, .0003469},
     {.0062555, .0611921, .2265608, .3260637, .2588354, .0956070, .0224705, .0025946, .0005205},
     {.0045860, .0477879, .1983002, .3184667, .2792811, .1158950, .0301128, .0048471, .0007233},
     {.0032908, .0374390, .1704196, .3071862, .2948565, .1392594, .0386738, .0078701, .0010046},
     {.0022750, .0291416, .1437645, .2928006, .3063902, .1641647, .0484343, .0116151, .0014149},
     {.0014893, .0222369, .1190439, .2756297, .3144908, .1892897, .0597353, .0160828, .0029917},
     {.0009061, .0163528, .0968110, .2558524, .3194566, .2134888, .0729739, .0213339, .0020017},
     {.0004647, .0113283, .0775201, .2335926, .3213289, .2356614, .0886183, .0274895, .0039531},
     {.0002800, .0071460, .0615577, .2089810, .3200121, .2545846, .1072344, .0347255, .0054786},
     {.0002064, .0038856, .0492548, .1822078, .3154159, .2687282, .1295143, .0432654, .0075217}
    };
  static G4double Pu239nubar [11] = {
      2.8760000,
      3.0088800,
      3.1628300,
      3.3167800,
      3.4707300,
      3.6246800,
      3.7786300,
      3.9325800,
      4.0865300,
      4.2404900,
      4.3944400
    };
  G4double fraction, r, cum;
  G4int engind, nu;
 
/* 
  Check if nubar is within the range of experimental values
*/
  if(nubar >= Pu239nubar[0] && nubar <= Pu239nubar[10]) {
/*
     Use Zucker and Holden Data
*/
     engind = 1;
     while (nubar > Pu239nubar[engind]){ engind++;}
     fraction = (nubar-Pu239nubar[engind-1])/(Pu239nubar[engind]-Pu239nubar[engind-1]);
     if(fisslibrng() > fraction) engind--;
 
     r = fisslibrng();
     nu = 0;
     cum = Pu239nu[engind][0];
     while (r > cum && nu < 8){ 
       nu++;
       cum += Pu239nu[engind][nu];
     }
     return nu;
  } else {
/*
     Use Terrell's formula
*/
     return (G4int) G4SmpTerrell(nubar);
  }
}