Gabriele Cosmo
147 lines
5.7 KiB
C++
147 lines
5.7 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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//
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// This software was developed by Lawrence Livermore National Laboratory.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// 3. The name of the author may not be used to endorse or promote products
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// derived from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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// EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// Copyright (c) 2006 The Regents of the University of California.
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// All rights reserved.
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// UCRL-CODE-224807
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//
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//
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//
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#include <cmath>
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#include "G4Pow.hh"
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#include "G4fissionEvent.hh"
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G4int G4fissionEvent::G4SmpNuDistDataPu239_241(G4double nubar) {
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/*
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Description
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Sample Number of Neutrons from fission in Pu-239 and Pu-241 using
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Zucker and Holden's tabulated data for Pu-239
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The P(nu) distribution is given as a function of the average
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number of neutrons from fission, based on interpolation of the
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Pu-239 data from Zucker and Holden.
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*/
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/*
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Input
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nubar - average number of neutrons per fission
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Output
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G4SmpNuDistDataPu239_241 - sampled multiplicity
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*/
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G4double pnu[9], cpnu, sum;
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G4double r;
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/*
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Check if nubar is within the range of experimental values
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*/
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if(nubar >= 2.85 && nubar <= 4.25) {
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/*
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Use Zucker and Holden Data
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*/
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G4Pow* Pow=G4Pow::GetInstance();
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pnu[0]=-2.412937e-3*Pow->powN(nubar,3)+3.210687e-2*Pow->powN(nubar,2)-1.434037e-1*nubar+2.150733e-1;
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pnu[1]=-2.650615e-2*Pow->powN(nubar,3)+3.290389e-1*Pow->powN(nubar,2)-1.389007*nubar+2.002327;
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pnu[2]=3.232028e-2*Pow->powN(nubar,3)-3.176093e-1*Pow->powN(nubar,2)+8.605098e-1*nubar-3.411191e-1;
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pnu[3]=1.623289e-2*Pow->powN(nubar,3)-2.414705e-1*Pow->powN(nubar,2)+1.007282*nubar-9.583769e-1;
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pnu[4]=1.932275e-2*Pow->powN(nubar,3)-2.923666e-1*Pow->powN(nubar,2)+1.421383*nubar-1.924025;
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pnu[5]=-6.185679e-2*Pow->powN(nubar,3)+6.82888e-1*Pow->powN(nubar,2)-2.347653*nubar+2.647049;
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pnu[6]=1.79773e-2*Pow->powN(nubar,3)-1.60516e-1*Pow->powN(nubar,2)+5.228077e-1*nubar-5.939556e-1;
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pnu[7]=3.530038e-3*Pow->powN(nubar,4)-4.925425e-2*Pow->powN(nubar,3)+2.726784e-1*Pow->powN(nubar,2)-6.81281e-1*nubar+6.347577e-1;
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pnu[8]=2.837523e-3*Pow->powN(nubar,3)-2.678644e-2*Pow->powN(nubar,2)+8.545638e-2*nubar-9.156078e-2;
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sum=pnu[0]+pnu[1]+pnu[2]+pnu[3]+pnu[4]+pnu[5]+pnu[6]+pnu[7]+pnu[8];
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pnu[0]=pnu[0]/sum;
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pnu[1]=pnu[1]/sum;
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pnu[2]=pnu[2]/sum;
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pnu[3]=pnu[3]/sum;
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pnu[4]=pnu[4]/sum;
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pnu[5]=pnu[5]/sum;
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pnu[6]=pnu[6]/sum;
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pnu[7]=pnu[7]/sum;
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pnu[8]=pnu[8]/sum;
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r=fisslibrng();
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if(r <= pnu[0]) return 0;
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cpnu=pnu[0]+pnu[1];
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if(r <= cpnu) return 1;
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cpnu=cpnu+pnu[2];
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if(r <= cpnu) return 2;
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cpnu=cpnu+pnu[3];
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if(r <= cpnu) return 3;
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cpnu=cpnu+pnu[4];
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if(r <= cpnu) return 4;
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cpnu=cpnu+pnu[5];
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if(r <= cpnu) return 5;
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cpnu=cpnu+pnu[6];
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if(r <= cpnu) return 6;
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cpnu=cpnu+pnu[7];
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if(r <= cpnu) return 7;
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else return 8;
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} else {
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/*
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Use Terrell's formula
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*/
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return (G4int) G4SmpTerrell(nubar);
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}
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}
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