ENTRY 22785 20121229 22342278500000001 SUBENT 22785001 20121229 22342278500100001 BIB 12 33 2278500100002 TITLE .Measurement of the fission cross section of 238U in 2278500100003 a neutron spectrum with average energy of 5.0 MeV 2278500100004 AUTHOR (I.Celenk,T.Bayar) 2278500100005 INSTITUTE (2TUKANR) Celenk 2278500100006 (2TUKGZU) Bayar -Gazi University of Science and Art 2278500100007 Teknik Okullar, Ankara, Turkey 2278500100008 REFERENCE (J,RCA,85,85,1999) 2278500100009 METHOD (ACTIV) Irradiation time 18 hr for In-115(N,INL)In-115m2278500100010 reaction and 15 days for U-238(N,F). 2278500100011 (GSPEC,SITA) 2278500100012 INC-SOURCE (AM-BE) 241-americium-beryllium neutron source 2278500100013 INC-SPECT .Maximum energy 11 MeV. Fig.1 of reference. Average 2278500100014 energy aprx. 5 MeV. 2278500100015 DETECTOR (HPGE) For measuring of activities of thorium in tubes 2278500100016 containing In2O3/Tho2 and Uo2/Tho2 homogeneous 2278500100017 mixtures to define detector counting efficiencies by 2278500100018 five separate measurements for Ac-228 gamma energies. 2278500100019 For gamma-spectra of samples after irradiation. 2278500100020 Detector counting efficiency(fitted values): 2278500100021 33.73E-3 at 336.2 keV for In-115m, 2278500100022 20.87E-1 at 537.3 keV for Ba-140. 2278500100023 SAMPLE U-O2 oxide of 99.55% purity placed into cylindrical 2278500100024 polyethilene tube 27.4 mm long,7.65 mm inner diameter,2278500100025 wall thickness 1 mm.U-238 isotopic abundance 99.2745%.2278500100026 In2-O3 oxide in polyethilene tube of same dimensions. 2278500100027 In-115 isotopic abundance 95.7%. 2278500100028 Uranium and indium samples were covered with cadmium 2278500100029 of 0.7 mm thickness. 2278500100030 MONITOR (49-IN-115(N,INL)49-IN-115-M,,SPC) 2278500100031 DECAY-MON (49-IN-115-M,4.486HR,DG,336.2,0.459) 2278500100032 HISTORY (20060320C) M.M./S.M. 2278500100033 (20060324U) Last checking has been done. 2278500100034 (20121229U) SD:INC-SOURCE was corrected:(A-BE -> AM-BE)2278500100035 ENDBIB 33 0 2278500100036 NOCOMMON 0 0 2278500100037 ENDSUBENT 36 0 2278500199999 SUBENT 22785002 20060324 21762278500200001 BIB 8 19 2278500200002 REACTION (92-U-238(N,F),,SIG,,FST) 2278500200003 DECAY-DATA (56-BA-140,12.746D,DG,537.3,0.236) 2278500200004 ANALYSIS (AREA) Gamma photopeak areas. 2278500200005 ASSUMED (ASSUM1,92-U-238(N,F)56-BA-140,CUM,FY) 2278500200006 (ASSUM2,49-IN-115(N,INL)49-IN-115-M,,SIG) 2278500200007 (ASSUM3,92-U-238(N,F),,SIG) 2278500200008 REL-REF (R,,Z.BODY+,B,OKAMOTO,,1987) For data assum2,assum3 2278500200009 ERR-ANALYS (ERR-T) Total error. 2278500200010 (ERR-1) Uncertainty of detector efficiency and peak 2278500200011 areas (from measurement statistics). 2278500200012 (ERR-2) Uncertainty of mass. 2278500200013 (ERR-3) Uncertainty of in-115-m 336.2 KeV gamma-line 2278500200014 intensity. 2278500200015 (ERR-4) Uncertainty of Ba-140 543. KeV gamma-line 2278500200016 intensity. 2278500200017 (ERR-5) Uncertainty of in-115 isotopic abundance. 2278500200018 (ERR-6) Uncertainty of U-238 isotopic abundance. 2278500200019 CORRECTION Correction for U-235(N,F) reaction was made. 2278500200020 STATUS From text of reference (P.88) 2278500200021 ENDBIB 19 0 2278500200022 COMMON 12 6 2278500200023 ERR-1 ERR-2 ERR-3 ERR-4 ERR-5 ERR-6 2278500200024 ASSUM1 ASSUM1-ERR ASSUM2 ASSUM2-ERR ASSUM3 ASSUM3-ERR 2278500200025 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 2278500200026 PC/FIS PC/FIS MB MB MB MB 2278500200027 2. 0.01 0.1 0.5 0.2 0.00152278500200028 5.7 0.2 325. 41. 543. 14.2278500200029 ENDCOMMON 6 0 2278500200030 DATA 3 1 2278500200031 EN-MEAN DATA ERR-T 2278500200032 MEV MB MB 2278500200033 5.04 527. 69. 2278500200034 ENDDATA 3 0 2278500200035 ENDSUBENT 34 0 2278500299999 ENDENTRY 2 0 2278599999999