[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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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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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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| 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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| 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: G4SmpNuDistDataPu239_241_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::G4SmpNuDistDataPu239_241_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 Pu-239 and Pu-241 using |
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| 67 | Zucker and Holden's tabulated data for Pu-239 |
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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 Pu-239 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 | G4SmpNuDistDataPu239_241_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 Pu239nu [11] [9] = { |
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| 83 | {.0108826, .0994916, .2748898, .3269196, .2046061, .0726834, .0097282, .0006301, .0001685}, |
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| 84 | {.0084842, .0790030, .2536175, .3289870, .2328111, .0800161, .0155581, .0011760, .0003469}, |
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| 85 | {.0062555, .0611921, .2265608, .3260637, .2588354, .0956070, .0224705, .0025946, .0005205}, |
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| 86 | {.0045860, .0477879, .1983002, .3184667, .2792811, .1158950, .0301128, .0048471, .0007233}, |
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| 87 | {.0032908, .0374390, .1704196, .3071862, .2948565, .1392594, .0386738, .0078701, .0010046}, |
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| 88 | {.0022750, .0291416, .1437645, .2928006, .3063902, .1641647, .0484343, .0116151, .0014149}, |
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| 89 | {.0014893, .0222369, .1190439, .2756297, .3144908, .1892897, .0597353, .0160828, .0029917}, |
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| 90 | {.0009061, .0163528, .0968110, .2558524, .3194566, .2134888, .0729739, .0213339, .0020017}, |
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| 91 | {.0004647, .0113283, .0775201, .2335926, .3213289, .2356614, .0886183, .0274895, .0039531}, |
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| 92 | {.0002800, .0071460, .0615577, .2089810, .3200121, .2545846, .1072344, .0347255, .0054786}, |
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| 93 | {.0002064, .0038856, .0492548, .1822078, .3154159, .2687282, .1295143, .0432654, .0075217} |
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| 94 | }; |
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| 95 | static G4double Pu239nubar [11] = { |
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| 96 | 2.8760000, |
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| 97 | 3.0088800, |
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| 98 | 3.1628300, |
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| 99 | 3.3167800, |
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| 100 | 3.4707300, |
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| 101 | 3.6246800, |
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| 102 | 3.7786300, |
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| 103 | 3.9325800, |
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| 104 | 4.0865300, |
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| 105 | 4.2404900, |
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| 106 | 4.3944400 |
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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 >= Pu239nubar[0] && nubar <= Pu239nubar[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 > Pu239nubar[engind]){ engind++;} |
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| 120 | fraction = (nubar-Pu239nubar[engind-1])/(Pu239nubar[engind]-Pu239nubar[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 = Pu239nu[engind][0]; |
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| 126 | while (r > cum && nu < 8){ |
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| 127 | nu++; |
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| 128 | cum += Pu239nu[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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