G4SmpNuDistDataPu239_241.cc

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00056 // $Id: G4SmpNuDistDataPu239_241.cc 69860 2013-05-16 14:39:02Z gcosmo $
00057 //
00058 
00059 #include <cmath>
00060 #include "G4fissionEvent.hh"
00061 
00062 G4int G4fissionEvent::G4SmpNuDistDataPu239_241(G4double nubar) {
00063 
00064 /*
00065   Description
00066     Sample Number of Neutrons from fission in Pu-239 and Pu-241 using 
00067     Zucker and Holden's tabulated data for Pu-239
00068     The P(nu) distribution is given as a function of the average 
00069     number of neutrons from fission, based on interpolation of the 
00070     Pu-239 data from Zucker and Holden.
00071 */
00072 
00073 /*
00074   Input
00075     nubar    - average number of neutrons per fission
00076   Output
00077     G4SmpNuDistDataPu239_241  - sampled multiplicity
00078     
00079 */
00080 
00081   G4double pnu[9], cpnu, sum;
00082   G4double r;
00083 
00084 /* 
00085   Check if nubar is within the range of experimental values
00086 */
00087   if(nubar >= 2.85 && nubar <= 4.25) {
00088 /*
00089      Use Zucker and Holden Data
00090 */
00091      pnu[0]=-2.412937e-3*std::pow(nubar,3)+3.210687e-2*std::pow(nubar,2)-1.434037e-1*nubar+2.150733e-1;
00092      pnu[1]=-2.650615e-2*std::pow(nubar,3)+3.290389e-1*std::pow(nubar,2)-1.389007*nubar+2.002327;
00093      pnu[2]=3.232028e-2*std::pow(nubar,3)-3.176093e-1*std::pow(nubar,2)+8.605098e-1*nubar-3.411191e-1;
00094      pnu[3]=1.623289e-2*std::pow(nubar,3)-2.414705e-1*std::pow(nubar,2)+1.007282*nubar-9.583769e-1;
00095      pnu[4]=1.932275e-2*std::pow(nubar,3)-2.923666e-1*std::pow(nubar,2)+1.421383*nubar-1.924025;
00096      pnu[5]=-6.185679e-2*std::pow(nubar,3)+6.82888e-1*std::pow(nubar,2)-2.347653*nubar+2.647049;
00097      pnu[6]=1.79773e-2*std::pow(nubar,3)-1.60516e-1*std::pow(nubar,2)+5.228077e-1*nubar-5.939556e-1;
00098      pnu[7]=3.530038e-3*std::pow(nubar,4)-4.925425e-2*std::pow(nubar,3)+2.726784e-1*std::pow(nubar,2)-6.81281e-1*nubar+6.347577e-1;
00099      pnu[8]=2.837523e-3*std::pow(nubar,3)-2.678644e-2*std::pow(nubar,2)+8.545638e-2*nubar-9.156078e-2;
00100 
00101      sum=pnu[0]+pnu[1]+pnu[2]+pnu[3]+pnu[4]+pnu[5]+pnu[6]+pnu[7]+pnu[8];
00102 
00103      pnu[0]=pnu[0]/sum;
00104      pnu[1]=pnu[1]/sum;
00105      pnu[2]=pnu[2]/sum;
00106      pnu[3]=pnu[3]/sum;
00107      pnu[4]=pnu[4]/sum;
00108      pnu[5]=pnu[5]/sum;
00109      pnu[6]=pnu[6]/sum;
00110      pnu[7]=pnu[7]/sum;
00111      pnu[8]=pnu[8]/sum;
00112 
00113      r=fisslibrng();
00114 
00115      if(r <= pnu[0]) return 0;
00116 
00117      cpnu=pnu[0]+pnu[1];
00118      if(r <= cpnu) return 1;
00119 
00120      cpnu=cpnu+pnu[2];
00121      if(r <= cpnu) return 2;
00122 
00123      cpnu=cpnu+pnu[3];
00124      if(r <= cpnu) return 3;
00125 
00126      cpnu=cpnu+pnu[4];
00127      if(r <= cpnu) return 4;
00128 
00129      cpnu=cpnu+pnu[5];
00130      if(r <= cpnu) return 5;
00131 
00132      cpnu=cpnu+pnu[6];
00133      if(r <= cpnu) return 6;
00134 
00135      cpnu=cpnu+pnu[7];
00136      if(r <= cpnu) return 7;
00137      else return 8;
00138 
00139   } else {
00140 /*
00141      Use Terrell's formula
00142 */
00143      return (G4int) G4SmpTerrell(nubar);
00144   }
00145 }

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