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Redistributions of source code must retain the above copyright notice, 00033 // this list of conditions and the following disclaimer. 00034 // 2. Redistributions in binary form must reproduce the above copyright notice, 00035 // this list of conditions and the following disclaimer in the documentation 00036 // and/or other materials provided with the distribution. 00037 // 3. The name of the author may not be used to endorse or promote products 00038 // derived from this software without specific prior written permission. 00039 // 00040 // THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 00041 // WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 00042 // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO 00043 // EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 00044 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 00045 // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 00046 // OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 00047 // WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 00048 // OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 00049 // ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00050 // 00051 // Copyright (c) 2006 The Regents of the University of California. 00052 // All rights reserved. 00053 // UCRL-CODE-224807 00054 // 00055 // 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 }