ENTRY 14660 20220728 150414660000 1 SUBENT 14660001 20220728 150414660001 1 BIB 11 54 14660001 2 TITLE Neutron-induced fission fragment angular distributions,14660001 3 anisotropy, and linear momentum transfer measured with 14660001 4 the NIFFTE fission time projection chamber 14660001 5 AUTHOR (D.Hensle,J.T.Barker,J.S.Barrett,N.S.Bowden, 14660001 6 K.J.Brewster,J.Bundgaard,Z.Q.Case,R.J.Casperson, 14660001 7 D.A.Cebra,T.Classen,D.L.Duke,N.Fotiadis,J.Gearhart, 14660001 8 V.Geppert-Kleinrath,U.Greife,E.Guardincerri,C.Hagmann, 14660001 9 M.Heffner,C.R.Hicks,D.Higgins,L.D.Isenhower,K.Kazkaz, 14660001 10 A.Kemnitz,K.J.Kiesling,J.King,J.L.Klay,J.Latta,E.Leal, 14660001 11 W.Loveland,M.Lynch,J.A.Magee,B.Manning,M.P.Mendenhall, 14660001 12 M.Monterial,S.Mosby,G.Oman,C.Prokop,S.Sangiorgio, 14660001 13 K.T.Schmitt,B.Seilhan,L.Snyder,F.Tovesson,C.L.Towell, 14660001 14 R.S.Towell,T.R.Towell,N.Walsh,T.S.Watson,L.Yao, 14660001 15 W.Younes) 14660001 16 INSTITUTE (1USACSM,1USALRL,1USAORU,1USADAV,1USALAS) 14660001 17 (1USAUSA)Abilene Christian University,Abilene,Texas 14660001 18 (1USAUSA)California Polytechnic State University, 14660001 19 San Luis Obispo, California 14660001 20 REFERENCE (J,PR/C,102,014605,2020) Main reference 14660001 21 (T,HENSLE,2019) Thesis, Colorado School of Mines 14660001 22 FACILITY (LINAC,1USALAS) Experiment performed at the Los Alamos 14660001 23 National Laboratory's Neutron Science Center at the 14660001 24 WNR flight path 90L 14660001 25 METHOD (TOF) Neutron energy was determined by time of flight. 14660001 26 The time structure of the neutron beam is typically 14660001 27 set to a 100 Hz macropulse structure containing about 14660001 28 375 micropulses of 250 ps in width, each spaced 14660001 29 by 1.8mu-s.The start signal is the proton pulse hitting14660001 30 the spallation target and the stop signal is fragment 14660001 31 detection by the central cathode of the TPC chamber. 14660001 32 DETECTOR (TPC) Fission fragments were detected using fission 14660001 33 time projection chamber. It consists of two identical 14660001 34 gas volumes separated by central cathode plane. 14660001 35 Measured actinide targets were placed on the cathode 14660001 36 plane. Each gas volume has a highly segmented anode 14660001 37 with 2976 hexagonal readout pads, 2 mm in pitch. The 14660001 38 drift chamber was filled with 95% argon/5% isobutane 14660001 39 at 550 torr. Pads were read-out using MICROMEGAS. 14660001 40 INC-SOURCE (SPALL) Neutrons with unmoderated white flux were 14660001 41 produced by spallation reaction of 800 MeV protons on 14660001 42 tungsten target. 14660001 43 ERR-ANALYS (ERR-T) Total uncertainty 14660001 44 (ERR-S,1.,4.) Statistical uncertainty 14660001 45 (ERR-1,0.5,1.) Systematic uncertainty caused by 14660001 46 variation of electron drift speed 14660001 47 (ERR-2,0.2,4.) Systematic uncertainty connected with 14660001 48 variation of fit range 14660001 49 CORRECTION Following corrections were made 14660001 50 1. Correction for electron drift speed and electron 14660001 51 diffusion 14660001 52 2. Polar angle correction for fission fragments 14660001 53 3. Wrap-around correction, significant only for 235U 14660001 54 HISTORY (20200923C) Compiled by S.H. 14660001 55 (20220627A) S.H. Updated data in subs. 2,3 from thesis 14660001 56 ENDBIB 54 0 14660001 57 COMMON 1 3 14660001 58 ANG 14660001 59 ADEG 14660001 60 0. 14660001 61 ENDCOMMON 3 0 14660001 62 ENDSUBENT 61 0 1466000199999 SUBENT 14660002 20220728 150414660002 1 BIB 5 16 14660002 2 REACTION (92-U-235(N,F),,DA,FF,RSD) 14660002 3 Anisotropy W(0 deg)/W(90 deg) 14660002 4 SAMPLE Several combined actinide targets were used in U235 14660002 5 experiment. 14660002 6 1 Half-circular one-sided 235U/238U deposit on thin 14660002 7 100 mu-g/cm2 carbon backing 14660002 8 2.Half-circular one-sided 235U/239Pu deposit on thin 14660002 9 100 mu-g/cm2 carbon backing 14660002 10 3. Circular two-sided 235U/239Pu deposit on thick 14660002 11 0.5 mm Al backing 14660002 12 4. Circular two-sided 235U/235U deposit on thick 14660002 13 0.5 mm Al backing 14660002 14 ANALYSIS A weighted average is used between all the data sets 14660002 15 to provide the best estimate of anisotropy. 14660002 16 STATUS (TABLE) Data taken from thesis, appendix, tab.C5 14660002 17 HISTORY (20220627A) S.H. Updated data from thesis 14660002 18 ENDBIB 16 0 14660002 19 NOCOMMON 0 0 14660002 20 DATA 4 36 14660002 21 EN EN-RSL DATA ERR-T 14660002 22 MEV MEV NO-DIM NO-DIM 14660002 23 0.14 0.01 0.923 0.016 14660002 24 0.18 0.02 0.971 0.015 14660002 25 0.25 0.05 0.979 0.009 14660002 26 0.35 0.05 1.016 0.012 14660002 27 0.45 0.05 1.028 0.010 14660002 28 0.55 0.05 1.068 0.010 14660002 29 0.65 0.05 1.069 0.017 14660002 30 0.75 0.05 1.073 0.015 14660002 31 0.85 0.05 1.097 0.010 14660002 32 0.95 0.05 1.101 0.010 14660002 33 1.09 0.09 1.101 0.014 14660002 34 1.28 0.11 1.117 0.015 14660002 35 1.51 0.12 1.122 0.014 14660002 36 1.78 0.15 1.133 0.009 14660002 37 2.10 0.17 1.148 0.012 14660002 38 2.48 0.20 1.145 0.013 14660002 39 2.92 0.24 1.143 0.012 14660002 40 3.44 0.28 1.135 0.010 14660002 41 4.06 0.33 1.115 0.010 14660002 42 4.79 0.39 1.112 0.011 14660002 43 5.64 0.46 1.131 0.011 14660002 44 6.65 0.55 1.220 0.011 14660002 45 7.84 0.64 1.290 0.014 14660002 46 9.24 0.76 1.256 0.015 14660002 47 10.89 0.89 1.213 0.012 14660002 48 12.84 1.05 1.233 0.013 14660002 49 15.14 1.24 1.286 0.014 14660002 50 17.84 1.46 1.259 0.016 14660002 51 23.07 3.76 1.234 0.012 14660002 52 32.05 5.22 1.198 0.017 14660002 53 44.54 7.26 1.135 0.014 14660002 54 61.88 10.09 1.082 0.012 14660002 55 85.98 14.02 1.041 0.012 14660002 56 119.47 19.47 0.987 0.021 14660002 57 166.01 27.06 0.949 0.018 14660002 58 230.67 37.60 0.932 0.033 14660002 59 ENDDATA 38 0 14660002 60 ENDSUBENT 59 0 1466000299999 SUBENT 14660003 20220728 150414660003 1 BIB 5 12 14660003 2 REACTION (92-U-238(N,F),,DA,FF,RSD) 14660003 3 Anisotropy W(0 deg)/W(90 deg) 14660003 4 SAMPLE Several combined actinide targets were used in U238 14660003 5 experiment. 14660003 6 1. Half-circular one-sided 235U/238U deposit on thin 14660003 7 100 mu-g/cm2carbon backing 14660003 8 3. Circular two-sided 238U/239Pu deposit on thick 14660003 9 0.5 mm Al backing 14660003 10 ANALYSIS A weighted average is used between all the data sets 14660003 11 to provide the best estimate of anisotropy. 14660003 12 STATUS (TABLE) Data taken from thesis, appendix, tab.C6 14660003 13 HISTORY (20220627A) S.H. Updated data from thesis 14660003 14 ENDBIB 12 0 14660003 15 NOCOMMON 0 0 14660003 16 DATA 4 25 14660003 17 EN EN-RSL DATA ERR-T 14660003 18 MEV MEV NO-DIM NO-DIM 14660003 19 1.28 0.11 1.428 0.065 14660003 20 1.51 0.12 1.537 0.027 14660003 21 1.78 0.15 1.288 0.025 14660003 22 2.10 0.17 1.237 0.021 14660003 23 2.48 0.20 1.274 0.037 14660003 24 2.92 0.24 1.214 0.034 14660003 25 3.44 0.28 1.222 0.021 14660003 26 4.06 0.33 1.206 0.022 14660003 27 4.79 0.39 1.202 0.021 14660003 28 5.64 0.46 1.241 0.023 14660003 29 6.65 0.55 1.551 0.043 14660003 30 7.84 0.64 1.611 0.024 14660003 31 9.24 0.76 1.448 0.034 14660003 32 10.89 0.89 1.343 0.050 14660003 33 12.84 1.05 1.252 0.026 14660003 34 15.14 1.24 1.359 0.028 14660003 35 17.84 1.46 1.350 0.028 14660003 36 23.07 3.76 1.378 0.020 14660003 37 32.05 5.22 1.328 0.043 14660003 38 44.54 7.26 1.251 0.020 14660003 39 61.88 10.09 1.184 0.024 14660003 40 85.98 14.02 1.127 0.040 14660003 41 119.47 19.47 1.074 0.025 14660003 42 166.01 27.06 1.087 0.033 14660003 43 230.67 37.60 1.030 0.088 14660003 44 ENDDATA 27 0 14660003 45 ENDSUBENT 44 0 1466000399999 ENDENTRY 3 0 1466099999999