ENTRY 21670 20160707 22512167000000001 SUBENT 21670001 20160707 22512167000100001 BIB 12 39 2167000100002 INSTITUTE (2UK HAR) 2167000100003 REFERENCE (R,ANL-76-90,149,197606) Proceedings of NEANDC 2167000100004 specialists meeting. 2167000100005 (R,INDC(UK)-029U,9,1977)= 2167000100006 (R,NEANDC(E)-182U,(8),9,1977)= 2167000100007 (R,UKNDC-P-86,9,1976) 2167000100008 Authors and title are the same. 2167000100009 AUTHOR (P.A.R.Evans,G.B.Huxtable,G.D.James) 2167000100010 TITLE -The U-238/U-235 fission cross section ratio over the 2167000100011 energy range 1.2 to 2 MeV -. 2167000100012 FACILITY (SYNCY,2UK HAR) Harwell Synchrocyclotron. 2167000100013 INC-SOURCE (PHOTO) Pulsed neutron beam from synchrocyclotron 2167000100014 target, 140 MeV protons, 4 micro-A, 800Hz, 10 ns pulse2167000100015 width. Neutrons taken at 180 degrees to proton beam. 2167000100016 No moderator. 2167000100017 SAMPLE .Enriched foils of U-238 and U-235, deposited to a 2167000100018 thickness of 0.5 mg*cm-2 on thin al backings over an 2167000100019 area of 7.6 cm diameter. 2167000100020 METHOD (TOF) Time of flight, 25 meter flight path, evacuated 2167000100021 over a distance of 14 meters. 2167000100022 DETECTOR (SCIN) Gas scintillation fission fragment detector, 2167000100023 through which argon flowed continuously. The fissile 2167000100024 foils were places back to back in the centre of 2167000100025 the chamber which was optically divided in the 2167000100026 plane of the foils, each half viewed through quartz 2167000100027 windows by two EMI 9816QKB photomultipliers. 2167000100028 PART-DET (FF) Fission fragments. 2167000100029 CORRECTION .No correction was made for the U-235 content of the 2167000100030 U-238 foil (0.036 percent) or for the U-238 content 2167000100031 of the U-235 foil (6.06 percent). It was not possible 2167000100032 to measure directly the backgrounds, however an 2167000100033 energy dependent background giving a zero cross 2167000100034 section for U-238 at 0.2 and 0.4 MeV was subtracted. 2167000100035 HISTORY (19801016C) 2167000100036 (19801104E) 2167000100037 (20160707A) M.M. Upper -> lower case correction. 2167000100038 Dates were corrected for 4-digits year. 2167000100039 Digitized data were added in Subent 002. 2167000100040 Ref. R,INDC(UK)-029U,9,1977... was added. 2167000100041 ENDBIB 39 0 2167000100042 NOCOMMON 0 0 2167000100043 ENDSUBENT 42 0 2167000199999 SUBENT 21670002 20160707 22512167000200001 BIB 5 28 2167000200002 REACTION ((92-U-238(N,F),,SIG)/(92-U-235(N,F),,SIG)) 2167000200003 COMMENT .The principal objective was to establish an accurate 2167000200004 energy for the U-238 fission cross section threshold. 2167000200005 This was done by careful assessment of the energy 2167000200006 scale of the time of flight system, see AERE-7919. 2167000200007 The monitored carbon resonance energy was 2074+-3keV. 2167000200008 ERR-ANALYS (EN-ERR-DIG) Digitizing error of scale Y ( energy), 2167000200009 reflect non-linearity of scale. 2167000200010 Quantization error(one pixel)for scale X - 0.0005 MeV 2167000200011 (ERR-DIG) Digitizing error in scale Y ( data), 2167000200012 reflect non-linearity of scales. 2167000200013 Quantization error (one pixel)for scale Y - 2167000200014 0.0001 no-dim. 2167000200015 (DATA-ERR) No explanation of error type is given in the2167000200016 R,INDC(UK)-029U,9,1977; 2167000200017 errors are presented only for two data points on the 2167000200018 figure. 2167000200019 STATUS (CURVE) Fig.5 of R,INDC(UK)-029U,9,1977 2167000200020 Because of uncertainties associated with 2167000200021 background the data are considered by the authors 2167000200022 to be unreliable in magnitude, and were only used 2167000200023 as a verification of the data of J.W.Behrens and the 2167000200024 revised data of M.S.Coates - 4th Conf.on Neutron 2167000200025 Cross Section and Technology, NBS special publ. 425, 2167000200026 II, (1976), p.591 and 568, respectively. 2167000200027 HISTORY (19801016C) 2167000200028 (19801104E) 2167000200029 (20160707A) M.M. Digitized data were added. 2167000200030 ENDBIB 28 0 2167000200031 COMMON 2 3 2167000200032 EN-ERR-DIG ERR-DIG 2167000200033 MEV NO-DIM 2167000200034 0.832E-03 0.493E-03 2167000200035 ENDCOMMON 3 0 2167000200036 DATA 3 147 2167000200037 EN DATA DATA-ERR 2167000200038 MEV NO-DIM NO-DIM 2167000200039 1.1998 0.02214 2167000200040 1.2043 0.02359 2167000200041 1.2089 0.03289 2167000200042 1.2119 0.02945 2167000200043 1.2159 0.02896 2167000200044 1.2194 0.02895 2167000200045 1.2255 0.02747 2167000200046 1.2305 0.03284 2167000200047 1.2336 0.04018 2167000200048 1.2376 0.02891 2167000200049 1.2416 0.02988 2167000200050 1.2452 0.03232 2167000200051 1.2532 0.03573 2167000200052 1.2558 0.04062 2167000200053 1.2608 0.04306 2167000200054 1.2658 0.03815 2167000200055 1.2679 0.04402 2167000200056 1.2719 0.04156 2167000200057 1.2759 0.05331 2167000200058 1.2800 0.04840 2167000200059 1.2890 0.05083 2167000200060 1.2916 0.05866 2167000200061 1.2966 0.06159 2167000200062 1.3042 0.06696 2167000200063 1.3082 0.06695 2167000200064 1.3123 0.07184 2167000200065 1.3163 0.06791 2167000200066 1.3198 0.07133 2167000200067 1.3239 0.07279 2167000200068 1.3294 0.07425 2167000200069 1.3335 0.07767 2167000200070 1.3375 0.08059 2167000200071 1.3410 0.08059 2167000200072 1.3441 0.09429 2167000200073 1.3507 0.10113 2167000200074 1.3547 0.10455 2167000200075 1.3587 0.10650 2167000200076 1.3617 0.10405 2167000200077 1.3668 0.11824 2167000200078 1.3714 0.12214 2167000200079 1.3754 0.11822 2167000200080 1.3790 0.13388 2167000200081 1.3830 0.12359 2167000200082 1.3885 0.13288 2167000200083 1.3926 0.14707 2167000200084 1.3972 0.15833 0.00784 2167000200085 1.4017 0.16272 2167000200086 1.4057 0.17006 2167000200087 1.4108 0.17935 2167000200088 1.4154 0.18767 2167000200089 1.4199 0.18815 2167000200090 1.4245 0.20185 2167000200091 1.4285 0.21506 2167000200092 1.4331 0.22240 2167000200093 1.4382 0.24148 2167000200094 1.4417 0.23315 2167000200095 1.4473 0.24832 2167000200096 1.4508 0.26007 2167000200097 1.4569 0.26838 2167000200098 1.4614 0.26837 2167000200099 1.4700 0.26296 2167000200100 1.4755 0.26491 2167000200101 1.4806 0.26245 2167000200102 1.4851 0.27958 2167000200103 1.4897 0.28153 2167000200104 1.4952 0.28151 2167000200105 1.5003 0.28640 2167000200106 1.5048 0.28296 2167000200107 1.5099 0.29177 2167000200108 1.5164 0.29322 2167000200109 1.5209 0.29321 2167000200110 1.5255 0.28781 2167000200111 1.5305 0.28780 2167000200112 1.5351 0.29661 2167000200113 1.5401 0.29366 2167000200114 1.5452 0.29707 2167000200115 1.5512 0.30392 2167000200116 1.5553 0.31468 2167000200117 1.5603 0.31369 2167000200118 1.5653 0.30878 2167000200119 1.5724 0.31709 2167000200120 1.5775 0.33667 2167000200121 1.5835 0.33421 2167000200122 1.5886 0.33175 2167000200123 1.5941 0.33320 2167000200124 1.5997 0.33368 2167000200125 1.6047 0.34542 2167000200126 1.6102 0.33072 2167000200127 1.6153 0.34344 2167000200128 1.6203 0.33266 2167000200129 1.6269 0.33264 2167000200130 1.6319 0.33410 2167000200131 1.6385 0.33408 2167000200132 1.6445 0.33358 2167000200133 1.6501 0.34336 2167000200134 1.6546 0.35266 2167000200135 1.6602 0.34824 2167000200136 1.6672 0.35312 2167000200137 1.6738 0.33988 2167000200138 1.6799 0.35799 2167000200139 1.6854 0.34426 2167000200140 1.6915 0.35894 2167000200141 1.6970 0.36138 2167000200142 1.7020 0.35157 2167000200143 1.7096 0.35205 2167000200144 1.7156 0.35791 2167000200145 1.7227 0.37062 2167000200146 1.7273 0.36572 2167000200147 1.7333 0.37060 2167000200148 1.7399 0.38038 2167000200149 1.7469 0.37057 2167000200150 1.7530 0.38476 2167000200151 1.7585 0.36712 2167000200152 1.7651 0.36563 2167000200153 1.7711 0.36954 2167000200154 1.7777 0.37001 2167000200155 1.7843 0.39057 2167000200156 1.7903 0.39251 2167000200157 1.7979 0.38221 2167000200158 1.8034 0.38465 2167000200159 1.8100 0.40079 2167000200160 1.8170 0.39539 2167000200161 1.8230 0.37040 2167000200162 1.8301 0.40075 2167000200163 1.8377 0.40465 2167000200164 1.8433 0.41002 2167000200165 1.8498 0.40315 2167000200166 1.8569 0.40608 2167000200167 1.8649 0.40949 2167000200168 1.8705 0.40800 2167000200169 1.8786 0.40994 2167000200170 1.8856 0.41287 2167000200171 1.8921 0.40061 2167000200172 1.8997 0.40598 2167000200173 1.9073 0.42016 2167000200174 1.9133 0.40301 2167000200175 1.9203 0.39271 2167000200176 1.9284 0.40983 2167000200177 1.9355 0.39709 2167000200178 1.9426 0.41225 2167000200179 1.9501 0.41713 2167000200180 1.9582 0.41369 2167000200181 1.9652 0.40143 2167000200182 1.9733 0.41071 2167000200183 1.9809 0.41510 2167000200184 1.9880 0.42341 0.01714 2167000200185 1.9955 0.43025 2167000200186 ENDDATA 149 0 2167000200187 ENDSUBENT 186 0 2167000299999 ENDENTRY 2 0 2167099999999