ENTRY 12836 19870206 00001283600000001 SUBENT 12836001 19870206 00001283600100001 BIB 12 36 1283600100002 INSTITUTE (1USAORL) 1283600100003 REFERENCE (R,ORNL-TM-7988,8111) 1283600100004 AUTHOR (R.GWIN,R.R.SPENCER,R.W.INGLE) 1283600100005 TITLE MEASUREMENT OF THE AVERAGE NUMBER OF PROMPT NEUTRONS 1283600100006 EMITTED PER FISSION OF 233-U RELATIVE TO 252-CF FOR 1283600100007 THE ENERGY REGION 500 EV TO 10 MEV AND BELOW 0.3 EV 1283600100008 FACILITY (LINAC) ORELA 1283600100009 METHOD (TOF) 84.2 METER FLIGHT PATH 1283600100010 DETECTOR (SCIN) LIQUID SCINTILLATOR CONTAINING 0.22 WEIGHT 1283600100011 PERCENT NATURAL GADOLINIUM TO DETECT FISSION 1283600100012 NEUTRONS. THE SCINTILLATOR VOLUME WAS 0.910 M**3 1283600100013 (FISCH) FISSION CHAMBER TO DEFINE FISSION EVENTS. 1283600100014 CHAMBER IS FILLED 90 PERCENT ARGON AND 10 PERCENT 1283600100015 METHANE TO A PRESSURE OF 76-CM HG. 1283600100016 SAMPLE 40 MG OF 233-U ON ONE SIDE OF 18 ALUMINUM FOILS. THE 1283600100017 DEPOSIT IS 5.1 CM DIAMETER AND 1.1 GRAMS/METER**2 1283600100018 THICK. 1283600100019 ISOTOPE PERCENT 1283600100020 233-U 99.97 1283600100021 235-U .02 1283600100022 236-U .001 1283600100023 238-U .009 1283600100024 CORRECTION DATA ARE CORRECTED FOR BACKGROUND, ALPHA PILE-UP, 1283600100025 DELAYED FISSION GAMMAS, 'FALSE FISSIONS' AND 1283600100026 FISSIONS IN 252-CF 1283600100027 ERR-ANALYS (ERR-T) TOTAL UNCERTAINTY 1283600100028 ADDITIONAL ERRORS (IN PERCENT) - 1283600100029 252-CF SAMPLE 0.07 1283600100030 DISPLACEMENT OF FISSION SAMPLE FROM 1283600100031 SCINTILLATOR CENTER 0.05 1283600100032 'FALSE FISSIONS' 0.02 1283600100033 FISSION SPECTRUM DIFFERENCES 0.03 1283600100034 MISSED FISSIONS 0.05 1283600100035 STATUS (APRVD) R.W.GWIN, 84/3/2. 1283600100036 HISTORY (830914C) 1283600100037 (870206A) STATUS CHANGE. 1283600100038 ENDBIB 36 0 1283600100039 NOCOMMON 0 0 1283600100040 ENDSUBENT 39 0 1283600199999 SUBENT 12836002 19870206 00001283600200001 BIB 3 5 1283600200002 REACTION ((92-U-233(N,F),PR,NU,,AV)/(98-CF-252(0,F),PR,NU,,AV)) 1283600200003 ERR-ANALYS (ERR-S) STATISTICAL UNCERTAINTY 1283600200004 (ERR-1) UNCERTAINTY DUE TO PILE UP CORRETION 1283600200005 (ERR-2) UNCERTAINTY DUE TO DELAYED GAMMA CORRECTION 1283600200006 STATUS (SPSDD,13101002) 1283600200007 ENDBIB 5 0 1283600200008 NOCOMMON 0 0 1283600200009 NODATA 0 0 1283600200010 ENDSUBENT 9 0 1283600299999 SUBENT 12836003 19870206 00001283600300001 BIB 2 2 1283600300002 REACTION ((92-U-233(N,F),PR,NU,,AV)/(98-CF-252(0,F),PR,NU,,AV)) 1283600300003 STATUS (SPSDD,12833002) 1283600300004 ENDBIB 2 0 1283600300005 NOCOMMON 0 0 1283600300006 NODATA 0 0 1283600300007 ENDSUBENT 6 0 1283600399999 ENDENTRY 3 0 1283699999999