G4SmpNuDistDataU233_235.cc

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00056 // $Id: G4SmpNuDistDataU233_235.cc 69860 2013-05-16 14:39:02Z gcosmo $
00057 //
00058 
00059 #include <cmath>
00060 #include "G4fissionEvent.hh"
00061 
00062 int G4fissionEvent::G4SmpNuDistDataU233_235(G4double nubar) {
00063 
00064 /*
00065   Description
00066     Sample Number of Neutrons from fission in U-233 and U-235 using 
00067     Zucker and Holden's tabulated data for U-235
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     U-235 data from Zucker and Holden.
00071 */
00072 
00073 /*
00074   Input
00075     nubar    - average number of neutrons per fission
00076   Output
00077     G4SmpNuDistDataU233_235  - sampled multiplicity
00078     
00079 */
00080 
00081   G4double pnu[8], cpnu, sum;
00082   G4double r;
00083 
00084 /* 
00085   Check if nubar is within the range of experimental values
00086 */
00087   if(nubar >= 2.25 && nubar <= 4.0) {
00088 /*
00089      Use Zucker and Holden Data
00090 */
00091      if(nubar <= 2.8738) pnu[0]=-9.279554e-02*std::pow(nubar,3)+8.036687e-01*std::pow(nubar,2)-2.342684*nubar+2.309035;
00092      else if(nubar > 2.8738 && nubar <= 3.4272) pnu[0]=1.50072e-2*std::pow(nubar,2)-1.109109e-1*nubar+2.063133e-1;
00093      else pnu[0]=1.498897e+3*std::exp(-3.883864*nubar);
00094 
00095      if(nubar <= 3.2316) pnu[1]=3.531126e-2*std::pow(nubar,3)-2.787213e-1*std::pow(nubar,2)+5.824072e-1*nubar-1.067136e-1;
00096      else pnu[1]=6.574492e-2*std::pow(nubar,2)-5.425741e-1*nubar+1.123199;
00097 
00098      pnu[2]=1.274643e-2*std::pow(nubar,3)-1.387954e-1*std::pow(nubar,2)+3.264669e-1*nubar+1.77148e-1;
00099 
00100      pnu[3]=5.473738e-2*std::pow(nubar,5)-8.835826e-1*std::pow(nubar,4)+5.657201*std::pow(nubar,3)-1.802669e+1*std::pow(nubar,2)+2.867937e+1*nubar-1.794296e+1;
00101 
00102      pnu[4]=-3.591076e-2*std::pow(nubar,3)+3.092624e-1*std::pow(nubar,2)-7.184805e-1*nubar+5.649400e-1;
00103 
00104      if(nubar <= 2.8738) pnu[5]=1.699374e-2*std::pow(nubar,2)-1.069558e-3*nubar-6.981430e-2;
00105      else pnu[5]=2.100175e-2*std::pow(nubar,3)-1.705788e-1*std::pow(nubar,2)+5.575467e-1*nubar-6.245873e-1;
00106 
00107      if(nubar <= 3.0387) pnu[6]=9.431919e-7*std::pow(nubar,8.958848);
00108      else pnu[6]=4.322428e-3*std::pow(nubar,3)-2.094790e-2*std::pow(nubar,2)+4.449671e-2*nubar-4.435987e-2;
00109 
00110      pnu[7]=5.689084e-3*std::pow(nubar,4)-6.591895e-2*std::pow(nubar,3)+2.886861e-1*std::pow(nubar,2)-5.588146e-1*nubar+4.009166e-1;
00111 
00112      sum=pnu[0]+pnu[1]+pnu[2]+pnu[3]+pnu[4]+pnu[5]+pnu[6]+pnu[7];
00113 
00114      pnu[0]=pnu[0]/sum;
00115      pnu[1]=pnu[1]/sum;
00116      pnu[2]=pnu[2]/sum;
00117      pnu[3]=pnu[3]/sum;
00118      pnu[4]=pnu[4]/sum;
00119      pnu[5]=pnu[5]/sum;
00120      pnu[6]=pnu[6]/sum;
00121      pnu[7]=pnu[7]/sum;
00122 
00123      r=fisslibrng();
00124 
00125      if(r <= pnu[0]) return (int) 0;
00126 
00127      cpnu=pnu[0]+pnu[1];
00128      if(r <= cpnu) return (int) 1;
00129 
00130      cpnu=cpnu+pnu[2];
00131      if(r <= cpnu) return (int) 2;
00132 
00133      cpnu=cpnu+pnu[3];
00134      if(r <= cpnu) return (int) 3;
00135 
00136      cpnu=cpnu+pnu[4];
00137      if(r <= cpnu) return (int) 4;
00138 
00139      cpnu=cpnu+pnu[5];
00140      if(r <= cpnu) return (int) 5;
00141 
00142      cpnu=cpnu+pnu[6];
00143      if(r <= cpnu) return (int) 6;
00144      else return (int) 7;
00145   } else {
00146 /*
00147      Use Terrell's formula
00148 */
00149      return (int) G4SmpTerrell(nubar);
00150   }
00151 }

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