ENTRY 10802 20091020 13601080200000001 SUBENT 10802001 20091020 13601080200100001 BIB 13 51 1080200100002 INSTITUTE (1USARPI) 1080200100003 REFERENCE (J,NSE,80,263,1982) 1080200100004 (J,ANS,27,868,197712) 1080200100005 AUTHOR (R.C.Block,D.R.Harris,S.H.Kim,K.Kobayashi) 1080200100006 TITLE Uranium-238 Resonance Self-Indication Capture 1080200100007 Measurements 1080200100008 FACILITY (LINAC,1USARPI) Gaerttner Linear Accelerator 1080200100009 Laboratory 1080200100010 SAMPLE For low temperature, two 7.62-cm diameter sheets of 1080200100011 highly enriched (less than 4-ppm 235U) 238U with a 1080200100012 combined thickness of 0.053 cm. 1080200100013 For high temperature, single 5.77-cm diameter sheet of 1080200100014 highly enriched (less than 10-ppm 235U) 238U. 1080200100015 Depleted uranium shielding samples of various 1080200100016 thicknesses with 0.26+-0.03 atom% 235U. 1080200100017 METHOD (TOF) Time of flight with 25.65-m flight path. 1080200100018 Shielding sample located approx 4 meters from sample, 1080200100019 cycled in and out of beam. Collimators of steel, CH2, 1080200100020 and B4C located near target, B4C and lead located near1080200100021 detector. Lead sheet, 0.34-cm thick, used to reduce 1080200100022 gamma flash. Thermal and overlapping neutrons 1080200100023 suppressed with cadmium and B4C filters. Sample placed1080200100024 at center of scintillator and is shielded with 5-cm 1080200100025 thick LiH to prevent counts due to low energy neutrons1080200100026 scattered off sample. Shield also prevents low energy 1080200100027 neutrons scattered into detector solution from 1080200100028 returning to the sample. 1080200100029 DETECTOR (STANK) Liquid scintillator, 1.25-m diameter with 1080200100030 1100 liters of xylene-based boron loaded solution and 1080200100031 photomultipliers. 1080200100032 (NAICR) 5-cm thick by 20-cm diameter NaI detector for 1080200100033 monitor. 1080200100034 (SCIN) Plastic scintillator with photomultiplier for 1080200100035 neutrons 1080200100036 MONITOR Relative flux determined using 10B4-NaI flux detector. 1080200100037 Normalized to 6.67-eV saturated capture resonance. 1080200100038 CORRECTION Corrected for deadtime, background, relative flux 1080200100039 measurement and multiple scattering. 1080200100040 ERR-ANALYS Errors include: 1080200100041 - detector count errors, 1080200100042 - background errors, 1080200100043 - error in product of detector efficiency and flux 1080200100044 normalization (1%), 1080200100045 - relative flux error (1.5%). 1080200100046 STATUS (APRVD) Approved by R.C.Block, 1979/4/2. 1080200100047 HISTORY (19790122C) 1080200100048 (19790615A) Reference update 1080200100049 (19830914A) Reference and data updated. 1080200100050 (20091020A) VM:Updated to new date formats,lower case. 1080200100051 Reference updated. BIB updates. 1080200100052 Subentry 2 deleted (data not available). 1080200100053 ENDBIB 51 0 1080200100054 NOCOMMON 0 0 1080200100055 ENDSUBENT 54 0 1080200199999 NOSUBENT 10802002 20091020 13601080200200001 SUBENT 10802003 20091020 13601080200300001 BIB 4 7 1080200300002 REACTION 1(92-U-238(N,0),,EN) 1080200300003 2(92-U-238(N,EL),,WID) 1080200300004 3(92-U-238(N,G),,WID) 1080200300005 ANALYSIS (MLA) Feshbach-Porter-Weisskopf formalism 1080200300006 STATUS (TABLE) Data given from Table V in main reference. 1080200300007 HISTORY (19810612A) Status removed. 1080200300008 (20091020A) STATUS added. 1080200300009 ENDBIB 7 0 1080200300010 NOCOMMON 0 0 1080200300011 DATA 5 5 1080200300012 DATA 1DATA 2DATA-ERR 2DATA 3DATA-ERR 3 1080200300013 EV MILLI-EV MILLI-EV MILLI-EV MILLI-EV 1080200300014 6.67 1.51 0.05 22.36 0.66 1080200300015 20.90 9.39 0.16 23.76 0.31 1080200300016 36.80 31.47 0.13 23.55 0.13 1080200300017 66.1 27.54 1.84 23.34 0.56 1080200300018 80.7 1.92 0.05 25.60 0.94 1080200300019 ENDDATA 7 0 1080200300020 ENDSUBENT 19 0 1080200399999 ENDENTRY 3 0 1080299999999