ENTRY 30989 20150529 31703098900000001 SUBENT 30989001 20150529 31703098900100001 BIB 14 40 3098900100002 TITLE Averaged U-238 fission cross section measurement in 3098900100003 Cf-252 neutron spectrum. 3098900100004 AUTHOR (A.Pazirandeh,Y.Ahmedi-Zadeh) 3098900100005 INSTITUTE (3IRNTEH,3IRNNRT) 3098900100006 REFERENCE (C,91JUELIC,,112,199105) 3098900100007 SAMPLE Natural and depleted uranium foils of 9 mm diameter 3098900100008 and 0.1 to 0.32 mm thick. Purity was determined to be 3098900100009 92.5% by neutron activation, using standard uranium 3098900100010 foil, and chemical analysis. 3098900100011 INC-SOURCE (CF252) Neutron flux was determined from the informa- 3098900100012 tion provided by the manufacturer. The contribution of 3098900100013 spontaneous fission neutrons of Cm-248 to the neutron 3098900100014 flux density was estimated to be 0.13%. 3098900100015 INC-SPECT Cf-252 fission neutron spectrum 3098900100016 METHOD (ACTIV) 3098900100017 DETECTOR (HPGE) 3098900100018 ANALYSIS (DECAY) Cross section was calculated from the pure 3098900100019 activity of Te-132 which was determined from the net 3098900100020 area under the 228.2 keV photopeak. 3098900100021 CORRECTION The net area of the 228.2 keV photopeak of Te-132 was 3098900100022 corrected for branching ratio, gamma-ray self 3098900100023 absorption, fission yield, detector efficiency, 3098900100024 irradiation time, decay time, counting time and 3098900100025 interferences from neighbouring photopeaks of Np-239 3098900100026 and Pa-234. The relative contributions from these 3098900100027 photopeaks to the 228.20 keV peak of Te-132 were 3098900100028 determined by measuring the net areas under 278.0 keV 3098900100029 and 1001.0 keV of Np-239 and Pa-234 respectively. 3098900100030 ERR-ANALYS (DATA-ERR) Main sources of errors are due to 3098900100031 inaccuracy of: 3098900100032 * location of foils, 3098900100033 * neutron flux, 3098900100034 * counting statistics, 3098900100035 * weight of foils and 3098900100036 * interferences form neighbouring photopeak 3098900100037 STATUS (TABLE) Data are taken from the text of Conf. on Nucl. 3098900100038 Data for Sci. and Technol., Juelich 1991, page 112. 3098900100039 HISTORY (19920710C) HW 3098900100040 (20090912A) SD:Updated to new date formats,lower case. 3098900100041 (20150528U) VS. BIB update. 3098900100042 ENDBIB 40 0 3098900100043 NOCOMMON 0 0 3098900100044 ENDSUBENT 43 0 3098900199999 SUBENT 30989002 20090919 31413098900200001 BIB 1 1 3098900200002 REACTION (92-U-238(N,F),,SIG,,FIS) 3098900200003 ENDBIB 1 0 3098900200004 NOCOMMON 0 0 3098900200005 DATA 3 1 3098900200006 EN-DUMMY DATA DATA-ERR 3098900200007 MEV MB MB 3098900200008 1.5 329. 10. 3098900200009 ENDDATA 3 0 3098900200010 ENDSUBENT 9 0 3098900299999 ENDENTRY 2 0 3098999999999