ENTRY 30399 20140328 31633039900000001 SUBENT 30399001 20140328 31633039900100001 BIB 15 44 3039900100002 TITLE The 235U fission cross-section for 2200 m/sec neutrons 3039900100003 AUTHOR (I.Berceanu, C.Borcea, A.Buta, A.Constantinescu, 3039900100004 F.Cirstoiu, A.Galeriu, K.Galawez, A.Isbasescu, 3039900100005 I.Lazar, L.Marinescu, I.Mihai, I.M.Mihailescu, 3039900100006 P.Osiceanu, M.Petrascu, M.Petrovici, V.Simion, 3039900100007 G.Voiculescu) 3039900100008 INSTITUTE (3RUMBUC,3RUMBUU) 3039900100009 REFERENCE (J,RRP,23,867,1978) Final publication 3039900100010 (R,IFA-NR-60-1977,1977) Same as J,RRP,23,867,1978 3039900100011 EXP-YEAR (1977) 3039900100012 FACILITY (CHOPS) Slow chopper, 11 cm in diameter with 2 mm 3039900100013 slits operating at 5000 rpm with stability within 3039900100014 0.5%. 3039900100015 INC-SOURCE (REAC) VVR-S reactor 3039900100016 SAMPLE UF4, enriched 235U, evaporated target. 3039900100017 U targets were prepared at Geel, Belgium. 3039900100018 METHOD (TOF) Time of flight, path = 5.004 m to 235U target 3039900100019 and = 5.472 m to boron target. 3039900100020 The incident neutron flux was determined by detecting 3039900100021 the 477.61keV gamma from 10B(n,a)7Li. 3039900100022 The detection efficiency of fission fragments was 3039900100023 determined using thin-thick 235U target in the 2 3039900100024 ionization chambers. 3039900100025 The U mass for the 235U foils was obtained from the 3039900100026 alpha activity. 3039900100027 DETECTOR (IOCH) 2 ionization chambers for thin(10 ug/cm2) and 3039900100028 thick 235U targets. 3039900100029 (GELI) 71 cm3 ORTEC Ge(Li) spectrometer to detect 3039900100030 477.61 keV gamma line from 10B(n,a)7Li for neutron 3039900100031 flux measurement. 3039900100032 4pi beta-gamma counter for gamma detection efficiency. 3039900100033 MONITOR Absolute measurement (independent of any other cross- 3039900100034 section), but depending on branching ratio of 10B(n,a)3039900100035 and the gamma energies from 7Li* and from beta decay 3039900100036 of 198Au and depending on decay constant of 235U. 3039900100037 PART-DET (FF) 3039900100038 REL-REF (N,30140002,C.Borcea+,R,IFA-NR-47-1973,1973) 3039900100039 Experiment by same group but different run. 3039900100040 STATUS (APRVD) Approved by Petrascu (1978-05-22) with amend. 3039900100041 HISTORY (19770704C) KO. 3039900100042 (19780526U) KO. APRVD added. Correction in BIB section.3039900100043 (19781205U) KO. 3039900100044 (20090115A) BIB section updated 3039900100045 (20140328U) On. REFERENCE(RRP):vol.7 -> 23 3039900100046 ENDBIB 44 0 3039900100047 NOCOMMON 0 0 3039900100048 ENDSUBENT 47 0 3039900199999 SUBENT 30399002 20090105 31343039900200001 BIB 3 6 3039900200002 REACTION (92-U-235(N,F),,SIG) 3039900200003 STATUS (TABLE) Data taken from report IFA-NR-60-1977. 3039900200004 ERR-ANALYS (ERR-T) Total error is given. Main components are, 3039900200005 statistics of counts 0.42%., 3039900200006 the error in efficiency of gamma detection 0.43%, 3039900200007 and error in assaying in the thin U-target. 3039900200008 ENDBIB 6 0 3039900200009 NOCOMMON 0 0 3039900200010 DATA 3 1 3039900200011 EN DATA ERR-T 3039900200012 EV B B 3039900200013 2.5300E-02 5.8930E+02 4.7000E+00 3039900200014 ENDDATA 3 0 3039900200015 ENDSUBENT 14 0 3039900299999 ENDENTRY 2 0 3039999999999