ENTRY 21436 20180115 22672143600000001 SUBENT 21436001 20180115 22672143600100001 BIB 15 40 2143600100002 INSTITUTE (2UK HAR) Chemistry division. 2143600100003 REFERENCE (J,JNE/AB,16,195,1962) Data superseded. 2143600100004 (C,66PARIS,2,3,1966) Final data given. 2143600100005 AUTHOR (M.J.Cabell,L.J.Slee) 2143600100006 TITLE The ratio of thermal neutron capture to fission for 2143600100007 U-233 2143600100008 FACILITY (REAC,2UK HAR) PLUTO reactor. 2143600100009 DETECTOR Mass spectrometer. 2143600100010 INC-SOURCE (REAC) Irradiation in the flux scanning tube of the 2143600100011 B2 fuel element of the PLUTO reactor for 47 days. 2143600100012 INC-SPECT .The neutron spectrum in PLUTO has a temperature of 2143600100013 106 degrees and a large epithermal component ranging 2143600100014 from 0.046 to 0.066 for the epithermal index. 2143600100015 SAMPLE .Sample were prepared by mixing highly enriched 2143600100016 U-233 with 99.995% enriched U-238. Aliquots 2143600100017 of approx 100 micro-gr U-233 were dispersed in about 2143600100018 10 mg magnesium oxide for irradiation. 2143600100019 METHOD (ASEP) Isotopic mass separation using an A.E.I. 2143600100020 Type M.S.5 mass spectrometer. 10 Micro-g uranium 2143600100021 on tungsten filament surface ionization source. 2143600100022 ANALYSIS .Alpha derived from changes in isotopic composition 2143600100023 of uranium mixtures from neutron capture 2143600100024 and fission. 2143600100025 MONITOR (27-CO-59(N,G)27-CO-60-G+M,,SIG) 2143600100026 2200 m/sec value. 2143600100027 Separate Co-59, Sm-149 and U-238 sample 2143600100028 monitors were used to determine neutron flux, the 2143600100029 spectrum temperature and the epithermal component. 2143600100030 STATUS Final data from page 12, 66PARIS. 2143600100031 ERR-ANALYS (ERR-T) Uncertainty in the derived 2200 m/sec value are2143600100032 from: 2143600100033 (ERR-1) mass spectrometer statistical errors (0.1%), 2143600100034 (ERR-2) determination of spectrum average alpha (1.0%),2143600100035 this is then combined with uncertainties in Westcotts 2143600100036 G and S factors to give a total absolute uncertainty 2143600100037 HISTORY (19800303C) 2143600100038 (20180115U) SD:Updated to new date formats,lower case. 2143600100039 Data in Subent 002 were restored from archive. Ref. 2143600100040 was changed (RST,16 -> JNE/AB,16).ERR-ANALYS update. 2143600100041 DETECTOR added (part of info from FACILITY). 2143600100042 ENDBIB 40 0 2143600100043 COMMON 3 3 2143600100044 MONIT ERR-1 ERR-2 2143600100045 B PER-CENT PER-CENT 2143600100046 37.2 0.1 1.0 2143600100047 ENDCOMMON 3 0 2143600100048 ENDSUBENT 47 0 2143600199999 SUBENT 21436002 20180115 22672143600200001 BIB 3 3 2143600200002 REACTION (92-U-233(N,ABS),,ALF) 2200 m/sec value. 2143600200003 STATUS (TABLE) Text, page 12 of 66PARIS. 2143600200004 HISTORY (20180115U) SD: DATA-ERR -> ERR-T. 2143600200005 ENDBIB 3 0 2143600200006 NOCOMMON 0 0 2143600200007 DATA 3 1 2143600200008 EN DATA ERR-T 2143600200009 EV NO-DIM NO-DIM 2143600200010 0.0253 0.0923 0.0049 2143600200011 ENDDATA 3 0 2143600200012 ENDSUBENT 11 0 2143600299999 ENDENTRY 2 0 2143699999999