[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: G4SmpNuDistDataU232_234_236_238_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::G4SmpNuDistDataU232_234_236_238_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-232, U-234, U-236, |
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| 67 | and U-238 using Zucker and Holden's tabulated data for U-238 |
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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-238 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 | G4SmpNuDistDataU232_234_236_238_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 U238nu [11] [9] = { |
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| 83 | {.0396484, .2529541, .2939544, .2644470, .1111758, .0312261, .0059347, .0005436, .0001158}, |
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| 84 | {.0299076, .2043215, .2995886, .2914889, .1301480, .0363119, .0073638, .0006947, .0001751}, |
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| 85 | {.0226651, .1624020, .2957263, .3119098, .1528786, .0434233, .0097473, .0009318, .0003159}, |
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| 86 | {.0170253, .1272992, .2840540, .3260192, .1779579, .0526575, .0130997, .0013467, .0005405}, |
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| 87 | {.0124932, .0984797, .2661875, .3344938, .2040116, .0640468, .0173837, .0020308, .0008730}, |
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| 88 | {.0088167, .0751744, .2436570, .3379711, .2297901, .0775971, .0225619, .0030689, .0013626}, |
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| 89 | {.0058736, .0565985, .2179252, .3368863, .2541575, .0933127, .0286200, .0045431, .0031316}, |
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| 90 | {.0035997, .0420460, .1904095, .3314575, .2760413, .1112075, .0355683, .0065387, .0031316}, |
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| 91 | {.0019495, .0309087, .1625055, .3217392, .2943792, .1313074, .0434347, .0091474, .0046284}, |
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| 92 | {.0008767, .0226587, .1356058, .3076919, .3080816, .1536446, .0522549, .0124682, .0067176}, |
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| 93 | {.0003271, .0168184, .1111114, .2892434, .3160166, .1782484, .0620617, .0166066, .0095665} |
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| 94 | }; |
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| 95 | static G4double U238nubar [11] = { |
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| 96 | 2.2753781, |
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| 97 | 2.4305631, |
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| 98 | 2.5857481, |
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| 99 | 2.7409331, |
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| 100 | 2.8961181, |
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| 101 | 3.0513031, |
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| 102 | 3.2064881, |
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| 103 | 3.3616731, |
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| 104 | 3.5168581, |
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| 105 | 3.6720432, |
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| 106 | 3.8272281 |
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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 >= U238nubar[0] && nubar <= U238nubar[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 > U238nubar[engind]){ engind++;} |
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| 120 | fraction = (nubar-U238nubar[engind-1])/(U238nubar[engind]-U238nubar[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 = U238nu[engind][0]; |
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| 126 | while (r > cum && nu < 8){ |
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| 127 | nu++; |
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| 128 | cum += U238nu[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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