ENTRY 10084 20190722 14541008400000001 SUBENT 10084001 20190722 14541008400100001 BIB 13 30 1008400100002 TITLE Fission cross-section ratio measurements of 239Pu and 1008400100003 233U to 235U from 0.24 to 24 keV 1008400100004 AUTHOR (W.K.Lehto) 1008400100005 INSTITUTE (1USAAIF) 1008400100006 REFERENCE (J,NSE,39,361,1970) 1008400100007 FACILITY (CCW) 150-keV Cockcroft-Walton accelerator 1008400100008 INC-SOURCE (D-T) 1008400100009 INC-SPECT =181/(t+t0)**2 ( in keV, t in usec. 1008400100010 SAMPLE All samples electrodeposited on 0.005-in stainless 1008400100011 steel foils. Deposits 125-ug/cm2. 1008400100012 (92-U-235,ENR=0.93268) 1008400100013 Isotopic composition of 235U foils determined by mass 1008400100014 spectrometry (in at%): 1008400100015 235U (93.268%), 238U (5.409%), 234U (1.042%), 1008400100016 236U (0.280%). 1008400100017 DETECTOR (FISCH) Back-to-back parallel plate fission chamber 1008400100018 with 0.01-in thick aluminium walls. 1008400100019 Six pairs for 233U/235U, two pairs for 239Pu/235U. 1008400100020 Ar (90%) - Methane (10%) filling at atmospheric 1008400100021 pressure. 1008400100022 METHOD (SLODT) Lead slowing-down-time spectrometer (4-ft lead 1008400100023 cube) 1008400100024 ERR-ANALYS (ERR-S) Counting tatistics 1008400100025 (ERR-1) Detector calibration (~0.5%) 1008400100026 STATUS (TABLE) Table III of Nucl.Sci.Eng.39(1970)361 1008400100027 (APRVD) Approved by author 1008400100028 HISTORY (19701208C) 1008400100029 (19811125A) Converted to REACTION formalism 1008400100030 (19991013A) Converted to new data formalism. 1008400100031 (20190722A) On. Major revisions in 002 and 003. 1008400100032 ENDBIB 30 0 1008400100033 COMMON 1 3 1008400100034 ERR-1 1008400100035 PER-CENT 1008400100036 0.5 1008400100037 ENDCOMMON 3 0 1008400100038 ENDSUBENT 37 0 1008400199999 SUBENT 10084002 20190722 14541008400200001 BIB 5 14 1008400200002 REACTION ((94-PU-239(N,F),,SIG,,SDT)/(92-U-235(N,F),,SIG,,SDT)) 1008400200003 MONITOR ((94-PU-239(N,F),,SIG)/(92-U-235(N,F),,SIG)) 1008400200004 Normalized to the thermal ratio with the following 1008400200005 thermal cross sections and g-factos: 1008400200006 235U 577.1+/-0.9 b, g=0.975, 1008400200007 239Pu 740.6+/-3.5 b, g=1.045. 1008400200008 SAMPLE (94-PU-239,ENR=0.94472) 1008400200009 Isotopic composition determined by mass spectrometry 1008400200010 (in at%): 1008400200011 239Pu (94.472%), 240Pu (5.254%), 241Pu (0.261%), 1008400200012 242Pu (0.013%). 1008400200013 CORRECTION Correction to 239Pu count rate for contribution from 1008400200014 241Pu fission (0.4%). 1008400200015 HISTORY (20190722A) On. REACTION(SF8): SDT added. 1008400200016 ENDBIB 14 0 1008400200017 NOCOMMON 0 0 1008400200018 DATA 4 26 1008400200019 EN EN-RSL-HW DATA ERR-S 1008400200020 KEV KEV NO-DIM NO-DIM 1008400200021 0.24 0.02 0.96 0.04 1008400200022 0.26 0.02 0.91 0.04 1008400200023 0.28 0.02 0.92 0.04 1008400200024 0.30 0.03 0.82 0.04 1008400200025 0.33 0.03 0.86 0.04 1008400200026 0.36 0.03 0.85 0.04 1008400200027 0.39 0.04 0.86 0.04 1008400200028 0.43 0.05 0.83 0.04 1008400200029 0.48 0.05 0.81 0.04 1008400200030 0.53 0.06 0.84 0.03 1008400200031 0.59 0.07 0.82 0.03 1008400200032 0.66 0.08 0.81 0.03 1008400200033 0.73 0.09 0.73 0.03 1008400200034 0.83 0.10 0.75 0.03 1008400200035 0.95 0.12 0.66 0.03 1008400200036 1.1 0.15 0.71 0.03 1008400200037 1.3 0.19 0.77 0.03 1008400200038 1.6 0.24 0.68 0.03 1008400200039 1.9 0.31 0.66 0.03 1008400200040 2.3 0.40 0.62 0.03 1008400200041 3.0 0.57 0.58 0.03 1008400200042 3.9 0.81 0.63 0.03 1008400200043 5.4 1.3 0.64 0.03 1008400200044 7.9 2.2 0.58 0.02 1008400200045 12.5 4.3 0.62 0.02 1008400200046 24.0 10. 0.68 0.02 1008400200047 ENDDATA 28 0 1008400200048 ENDSUBENT 47 0 1008400299999 SUBENT 10084003 20190722 14541008400300001 BIB 4 11 1008400300002 REACTION ((92-U-233(N,F),,SIG,,SDT)/(92-U-235(N,F),,SIG,,SDT)) 1008400300003 MONITOR ((92-U-233(N,F),,SIG)/(92-U-235(N,F),,SIG)) 1008400300004 Normalized to the thermal ratio with the following 1008400300005 thermal cross sections and g-factos: 1008400300006 235U 577.1+/-0.9 b, g=0.975, 1008400300007 233U 525 +/-2 b, g=1.000. 1008400300008 SAMPLE (92-U-233,ENR=0.9991605) 1008400300009 Isotopic composition determined by mass spectrometry 1008400300010 (in at%): 1008400300011 233U (99.91605%), 234U (0.02070%), 238Pu (0.06325%). 1008400300012 HISTORY (20190722A) On. REACTION(SF8): SDT added. 1008400300013 ENDBIB 11 0 1008400300014 NOCOMMON 0 0 1008400300015 DATA 4 26 1008400300016 EN EN-RSL-HW DATA ERR-S 1008400300017 KEV KEV NO-DIM NO-DIM 1008400300018 0.24 0.02 1.35 0.04 1008400300019 0.26 0.02 1.39 0.04 1008400300020 0.28 0.02 1.21 0.04 1008400300021 0.30 0.03 1.27 0.03 1008400300022 0.33 0.03 1.26 0.03 1008400300023 0.36 0.03 1.28 0.03 1008400300024 0.39 0.04 1.35 0.03 1008400300025 0.43 0.05 1.33 0.03 1008400300026 0.48 0.05 1.28 0.03 1008400300027 0.53 0.06 1.23 0.03 1008400300028 0.59 0.07 1.20 0.03 1008400300029 0.66 0.08 1.17 0.03 1008400300030 0.73 0.09 1.18 0.03 1008400300031 0.83 0.10 1.27 0.03 1008400300032 0.95 0.12 1.28 0.03 1008400300033 1.1 0.15 1.33 0.03 1008400300034 1.3 0.19 1.40 0.03 1008400300035 1.6 0.24 1.36 0.03 1008400300036 1.9 0.31 1.37 0.03 1008400300037 2.3 0.40 1.33 0.03 1008400300038 3.0 0.57 1.36 0.03 1008400300039 3.9 0.81 1.40 0.03 1008400300040 5.4 1.3 1.38 0.02 1008400300041 7.9 2.2 1.34 0.02 1008400300042 12.5 4.3 1.39 0.02 1008400300043 24.0 10. 1.39 0.02 1008400300044 ENDDATA 28 0 1008400300045 ENDSUBENT 44 0 1008400399999 ENDENTRY 3 0 1008499999999