ENTRY 10698 20090709 13521069800000001 SUBENT 10698001 20090709 13521069800100001 BIB 13 36 1069800100002 INSTITUTE (1USAMHG) 1069800100003 REFERENCE (J,ANE,5,583,1978) 1069800100004 (J,ANS,26,595,197706) 1069800100005 AUTHOR (M.C.Davis,G.F.Knoll) 1069800100006 TITLE Fission cross sections of 235U and 239Pu averaged over 1069800100007 252Cf neutron spectrum. 1069800100008 INC-SOURCE (CF252) Spontaneous fission californium 252. 1069800100009 METHOD (MANGB) Manganese bath technique 1069800100010 DETECTOR (TRD) Latent tracks etched in films. 1069800100011 PART-DET (FF) Fission fragments 1069800100012 MONITOR 252Cf fission rate determined relative to Standard 1069800100013 Ra-Be photoneutron source, NBS-II. 1069800100014 CORRECTION Corrected for: 1069800100015 .counting efficiency calculated from geometric factors,1069800100016 .anisotropy of fission fragment yield, 1069800100017 .nonuniformity of target material deposit, 1069800100018 .spatial distribution in neutron production. 1069800100019 Neutron calibration by the manganese bath technique 1069800100020 required corrections with residual errors for: 1069800100021 .absorption in the source dry well and in the source 1069800100022 itself (0.6+-0.2%), 1069800100023 .fast capture by 32S(n,p) and 16O(n,alpha) reactions 1069800100024 (0.7+-0.2%), and 1069800100025 .neutron streaming and penetration (0.2+-0.1%). 1069800100026 ERR-ANALYS (ERR-T) Total uncertainty is the sum in quadrature of 1069800100027 statistical and systematic uncertainties. 1069800100028 (ERR-S) Statistical uncertainty. 1069800100029 (ERR-SYS) Systematic uncertainty. 1069800100030 See Table 3 in main reference for a list of 1069800100031 contributions to uncertainties. 1069800100032 STATUS (APRVD) Approved by M.C. Davis, 1978/1/23. 1069800100033 (TABLE) Data taken from Table 2 in main reference. 1069800100034 HISTORY (19771001C) 1069800100035 (19790425A) Reference updated. Data revised. 1069800100036 (20081109A) BIB section updated 1069800100037 (20090709A) On. STATUS: TABLE added 1069800100038 ENDBIB 36 0 1069800100039 NOCOMMON 0 0 1069800100040 ENDSUBENT 39 0 1069800199999 SUBENT 10698002 20081115 13521069800200001 BIB 2 3 1069800200002 REACTION (92-U-235(N,F),,SIG,,FIS) 1069800200003 SAMPLE U3O2 deposits, enriched to 99.4% 235U, on 20-mil 1069800200004 platinum foil. Mass deposit uncertain to 0.5% 1069800200005 ENDBIB 3 0 1069800200006 NOCOMMON 0 0 1069800200007 DATA 5 1 1069800200008 EN-DUMMY DATA ERR-T ERR-S ERR-SYS 1069800200009 MEV B B PER-CENT PER-CENT 1069800200010 1.1 1.215 0.022 0.95 1.51 1069800200011 ENDDATA 3 0 1069800200012 ENDSUBENT 11 0 1069800299999 SUBENT 10698003 20081115 13521069800300001 BIB 2 3 1069800300002 REACTION (94-PU-239(N,F),,SIG,,FIS) 1069800300003 SAMPLE PuO2 deposits, 99.9% 239Pu, on 20-mil platinum foil. 1069800300004 Mass deposit uncertain to 1.4%. 1069800300005 ENDBIB 3 0 1069800300006 NOCOMMON 0 0 1069800300007 DATA 5 1 1069800300008 EN-DUMMY DATA ERR-T ERR-S ERR-SYS 1069800300009 MEV B B PER-CENT PER-CENT 1069800300010 1.1 1.790 0.041 0.96 2.05 1069800300011 ENDDATA 3 0 1069800300012 ENDSUBENT 11 0 1069800399999 ENDENTRY 3 0 1069899999999