[819] | 1 | // |
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| 2 | // ******************************************************************** |
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| 3 | // * License and Disclaimer * |
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| 4 | // * * |
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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| 7 | // * conditions of the Geant4 Software License, included in the file * |
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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| 9 | // * include a list of copyright holders. * |
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| 10 | // * * |
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| 11 | // * Neither the authors of this software system, nor their employing * |
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| 12 | // * institutes,nor the agencies providing financial support for this * |
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| 13 | // * work make any representation or warranty, express or implied, * |
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| 14 | // * regarding this software system or assume any liability for its * |
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| 15 | // * use. Please see the license in the file LICENSE and URL above * |
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| 16 | // * for the full disclaimer and the limitation of liability. * |
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| 17 | // * * |
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| 18 | // * This code implementation is the result of the scientific and * |
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| 19 | // * technical work of the GEANT4 collaboration. * |
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| 20 | // * By using, copying, modifying or distributing the software (or * |
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| 21 | // * any work based on the software) you agree to acknowledge its * |
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| 22 | // * use in resulting scientific publications, and indicate your * |
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| 23 | // * acceptance of all terms of the Geant4 Software license. * |
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| 24 | // ******************************************************************** |
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| 25 | // |
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| 26 | // |
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| 27 | // This software was developed by Lawrence Livermore National Laboratory. |
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| 28 | // |
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| 29 | // Redistribution and use in source and binary forms, with or without |
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| 30 | // modification, are permitted provided that the following conditions are met: |
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| 31 | // |
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| 32 | // 1. Redistributions of source code must retain the above copyright notice, |
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| 33 | // this list of conditions and the following disclaimer. |
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| 34 | // 2. Redistributions in binary form must reproduce the above copyright notice, |
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| 35 | // this list of conditions and the following disclaimer in the documentation |
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| 36 | // and/or other materials provided with the distribution. |
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| 37 | // 3. The name of the author may not be used to endorse or promote products |
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| 38 | // derived from this software without specific prior written permission. |
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| 39 | // |
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| 40 | // THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
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| 41 | // WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
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| 42 | // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
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| 43 | // EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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| 44 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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| 45 | // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; |
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| 46 | // OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
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| 47 | // WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
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| 48 | // OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
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| 49 | // ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 50 | // |
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| 51 | // Copyright (c) 2006 The Regents of the University of California. |
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| 52 | // All rights reserved. |
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| 53 | // UCRL-CODE-224807 |
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| 54 | // |
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| 55 | // |
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| 56 | // $Id: G4SmpNuDistDataU233_235_MC.cc,v 1.2 2007/06/01 13:46:53 gcosmo Exp $ |
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| 57 | // |
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| 58 | |
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| 59 | #include <cmath> |
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| 60 | #include "G4fissionEvent.hh" |
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| 61 | |
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| 62 | G4int G4fissionEvent::G4SmpNuDistDataU233_235_MC(G4double nubar) { |
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| 63 | |
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| 64 | /* |
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| 65 | Description |
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| 66 | Sample Number of Neutrons from fission in U-233 and U-235 using |
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| 67 | Zucker and Holden's tabulated data for U-235 |
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| 68 | The 11 P(nu) distributions are given as a function of nubar, |
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| 69 | the average number of neutrons from induced fission for the |
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| 70 | 11 different energies (0 to 10 MeV), based on the U-235 data |
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| 71 | from Zucker and Holden. |
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| 72 | */ |
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| 73 | |
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| 74 | /* |
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| 75 | Input |
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| 76 | nubar - average number of neutrons per fission |
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| 77 | Output |
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| 78 | G4SmpNuDistDataU233_235_MC - sampled multiplicity |
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| 79 | |
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| 80 | */ |
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| 81 | |
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| 82 | static G4double U235nu [11] [8] = { |
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| 83 | {.0317223, .1717071, .3361991, .3039695, .1269459, .0266793, .0026322, .0001449}, |
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| 84 | {.0237898, .1555525, .3216515, .3150433, .1444732, .0356013, .0034339, .0004546}, |
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| 85 | {.0183989, .1384891, .3062123, .3217566, .1628673, .0455972, .0055694, .0011093}, |
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| 86 | {.0141460, .1194839, .2883075, .3266568, .1836014, .0569113, .0089426, .0019504}, |
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| 87 | {.0115208, .1032624, .2716849, .3283426, .2021206, .0674456, .0128924, .0027307}, |
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| 88 | {.0078498, .0802010, .2456595, .3308175, .2291646, .0836912, .0187016, .0039148}, |
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| 89 | {.0046272, .0563321, .2132296, .3290407, .2599806, .1045974, .0265604, .0056322}, |
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| 90 | {.0024659, .0360957, .1788634, .3210507, .2892537, .1282576, .0360887, .0079244}, |
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| 91 | {.0012702, .0216090, .1472227, .3083032, .3123950, .1522540, .0462449, .0107009}, |
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| 92 | {.0007288, .0134879, .1231200, .2949390, .3258251, .1731879, .0551737, .0135376}, |
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| 93 | {.0004373, .0080115, .1002329, .2779283, .3342611, .1966100, .0650090, .0175099} |
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| 94 | }; |
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| 95 | static G4double U235nubar [11] = { |
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| 96 | 2.4140000, |
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| 97 | 2.5236700, |
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| 98 | 2.6368200, |
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| 99 | 2.7623400, |
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| 100 | 2.8738400, |
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| 101 | 3.0386999, |
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| 102 | 3.2316099, |
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| 103 | 3.4272800, |
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| 104 | 3.6041900, |
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| 105 | 3.7395900, |
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| 106 | 3.8749800 |
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| 107 | }; |
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| 108 | G4double fraction, r, cum; |
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| 109 | G4int engind, nu; |
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| 110 | |
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| 111 | /* |
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| 112 | Check if nubar is within the range of experimental values |
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| 113 | */ |
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| 114 | if(nubar >= U235nubar[0] && nubar <= U235nubar[10]) { |
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| 115 | /* |
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| 116 | Use Zucker and Holden Data |
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| 117 | */ |
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| 118 | engind = 1; |
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| 119 | while (nubar > U235nubar[engind]){ engind++;} |
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| 120 | fraction = (nubar-U235nubar[engind-1])/(U235nubar[engind]-U235nubar[engind-1]); |
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| 121 | if(fisslibrng() > fraction) engind--; |
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| 122 | |
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| 123 | r = fisslibrng(); |
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| 124 | nu = 0; |
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| 125 | cum = U235nu[engind][0]; |
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| 126 | while (r > cum && nu < 7){ |
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| 127 | nu++; |
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| 128 | cum += U235nu[engind][nu]; |
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| 129 | } |
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| 130 | return nu; |
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| 131 | } else { |
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| 132 | /* |
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| 133 | Use Terrell's formula |
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| 134 | */ |
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| 135 | return (G4int) G4SmpTerrell(nubar); |
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| 136 | } |
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| 137 | } |
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