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source/processes/hadronic/models/fission/src/G4SmpNuDistDataPu239_241.cc

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+//
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+//
+//
+// This software was developed by Lawrence Livermore National Laboratory.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice,
+//   this list of conditions and the following disclaimer.
+// 2. Redistributions in binary form must reproduce the above copyright notice,
+//   this list of conditions and the following disclaimer in the documentation
+//   and/or other materials provided with the distribution.
+// 3. The name of the author may not be used to endorse or promote products
+//   derived from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+// EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Copyright (c) 2006 The Regents of the University of California.
+// All rights reserved.
+// UCRL-CODE-224807
+//
+//
+// $Id: G4SmpNuDistDataPu239_241.cc 67966 2013-03-13 09:38:38Z gcosmo $
+//
+
+#include <cmath>
+#include "G4fissionEvent.hh"
+
+G4int G4fissionEvent::G4SmpNuDistDataPu239_241(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 P(nu) distribution is given as a function of the average 
+    number of neutrons from fission, based on interpolation of the 
+    Pu-239 data from Zucker and Holden.
+*/
+
+/*
+  Input
+    nubar    - average number of neutrons per fission
+  Output
+    G4SmpNuDistDataPu239_241  - sampled multiplicity
+    
+*/
+
+  G4double pnu[9], cpnu, sum;
+  G4double r;
+
+/* 
+  Check if nubar is within the range of experimental values
+*/
+  if(nubar >= 2.85 && nubar <= 4.25) {
+/*
+     Use Zucker and Holden Data
+*/
+     pnu[0]=-2.412937e-3*std::pow(nubar,3)+3.210687e-2*std::pow(nubar,2)-1.434037e-1*nubar+2.150733e-1;
+     pnu[1]=-2.650615e-2*std::pow(nubar,3)+3.290389e-1*std::pow(nubar,2)-1.389007*nubar+2.002327;
+     pnu[2]=3.232028e-2*std::pow(nubar,3)-3.176093e-1*std::pow(nubar,2)+8.605098e-1*nubar-3.411191e-1;
+     pnu[3]=1.623289e-2*std::pow(nubar,3)-2.414705e-1*std::pow(nubar,2)+1.007282*nubar-9.583769e-1;
+     pnu[4]=1.932275e-2*std::pow(nubar,3)-2.923666e-1*std::pow(nubar,2)+1.421383*nubar-1.924025;
+     pnu[5]=-6.185679e-2*std::pow(nubar,3)+6.82888e-1*std::pow(nubar,2)-2.347653*nubar+2.647049;
+     pnu[6]=1.79773e-2*std::pow(nubar,3)-1.60516e-1*std::pow(nubar,2)+5.228077e-1*nubar-5.939556e-1;
+     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;
+     pnu[8]=2.837523e-3*std::pow(nubar,3)-2.678644e-2*std::pow(nubar,2)+8.545638e-2*nubar-9.156078e-2;
+
+     sum=pnu[0]+pnu[1]+pnu[2]+pnu[3]+pnu[4]+pnu[5]+pnu[6]+pnu[7]+pnu[8];
+
+     pnu[0]=pnu[0]/sum;
+     pnu[1]=pnu[1]/sum;
+     pnu[2]=pnu[2]/sum;
+     pnu[3]=pnu[3]/sum;
+     pnu[4]=pnu[4]/sum;
+     pnu[5]=pnu[5]/sum;
+     pnu[6]=pnu[6]/sum;
+     pnu[7]=pnu[7]/sum;
+     pnu[8]=pnu[8]/sum;
+
+     r=fisslibrng();
+
+     if(r <= pnu[0]) return 0;
+
+     cpnu=pnu[0]+pnu[1];
+     if(r <= cpnu) return 1;
+
+     cpnu=cpnu+pnu[2];
+     if(r <= cpnu) return 2;
+
+     cpnu=cpnu+pnu[3];
+     if(r <= cpnu) return 3;
+
+     cpnu=cpnu+pnu[4];
+     if(r <= cpnu) return 4;
+
+     cpnu=cpnu+pnu[5];
+     if(r <= cpnu) return 5;
+
+     cpnu=cpnu+pnu[6];
+     if(r <= cpnu) return 6;
+
+     cpnu=cpnu+pnu[7];
+     if(r <= cpnu) return 7;
+     else return 8;
+
+  } else {
+/*
+     Use Terrell's formula
+*/
+     return (G4int) G4SmpTerrell(nubar);
+  }
+}