ENTRY 31660 20160929 31753166000000001 SUBENT 31660001 20160929 31753166000100001 BIB 12 45 3166000100002 TITLE Measurement of thermal neutron cross section and 3166000100003 resonance integral for the 165Ho(n,gamma)166gHo 3166000100004 reaction 3166000100005 AUTHOR (M.U.Rajput,N.L.Maidana,V.R.Vanin,M.S.Dias, 3166000100006 M.F.Koskinas) 3166000100007 INSTITUTE (3PAKNIL,3BZLUSP,3BZLIPE) 3166000100008 REFERENCE (J,RCA,97,63,2009) 3166000100009 FACILITY (REAC,3BZLUSP) 24A position in the core of the IEA-R1 3166000100010 reactor (IPEN, Sao Paulo, Brazil) operated at a 3166000100011 power of 3.5MW. 3166000100012 SAMPLE The spectrographically pure holmium oxide (Ho2O3) 3166000100013 powder was used to prepare the samples for reactor 3166000100014 neutron irradiation. About 3-5 mg Ho2O3 was weighed 3166000100015 on a Sartorius micro balance under controlled 3166000100016 humidity conditions. The samples of cobalt [using 3166000100017 wires of aluminum-cobalt (0.475%) alloy and pure 3166000100018 cobalt], gold [Al-Au (0.1143%) alloy foil], zirconium 3166000100019 foil and zinc were prepared for flux characterization 3166000100020 of the irradiation position and to determine the 3166000100021 1/E deviation parameter. 3166000100022 MONITOR (27-CO-59(N,G)27-CO-60,,SIG) 3166000100023 (30-ZN-64(N,G)30-ZN-65,,SIG) 3166000100024 (40-ZR-94(N,G)40-ZR-95,,SIG) 3166000100025 (79-AU-197(N,G)79-AU-198,,SIG) 3166000100026 DECAY-MON (27-CO-60-G,1925.2D,DG,1173.228,0.9985, 3166000100027 DG,1332.492,0.999826) 3166000100028 (30-ZN-65,244.06D,DG,1115.539,0.5060) 3166000100029 (40-ZR-95,64.032D,DG,724.192,0.4427, 3166000100030 DG,756.725,0.5438) 3166000100031 (79-AU-198-G,2.6944D,DG,411.80205,0.9554) 3166000100032 DECAY-DATA (67-HO-166-G,26.795HR,DG,80.5725,0.0655) 3166000100033 DETECTOR (HPGE) The high resolution gamma-ray spectrometer used 3166000100034 for the determination of induced activity in 3166000100035 radioactive samples employed a high purity germanium 3166000100036 detector, having a resolution of 1.90 keV at 1332.5 keV3166000100037 gamma-ray peak of 60Co. The detector was covered with a3166000100038 special shielding arrangement which contained lead, 3166000100039 cadmium, copper and PVC layers to avoid the 3166000100040 interference of potentially occurring lead X-ray in 3166000100041 the vicinity of our peak of interest (80.6 keV). 3166000100042 STATUS (TABLE) Data from the tables of the ref. 3166000100043 (APRVD) Entry approved by Dr. M.U.Rajput 3166000100044 HISTORY (20090211C) SD 3166000100045 (20160923U) VS. T1/2 in DECAY-DATA corrected. 3166000100046 Confirmed by M.J.Rajput (2014-10-21). 3166000100047 ENDBIB 45 0 3166000100048 NOCOMMON 0 0 3166000100049 ENDSUBENT 48 0 3166000199999 SUBENT 31660002 20090211 31333166000200001 BIB 3 13 3166000200002 REACTION (67-HO-165(N,G)67-HO-166-G,,SIG,,MXW) 3166000200003 ERR-ANALYS (ERR-T) Total uncertainty. The major contributions were3166000200004 from the uncertainties: 3166000200005 (ERR-1) in detector efficiency (deduced taking into 3166000200006 account the parameter co-variance matrix), 3166000200007 (ERR-2) the gamma-ray emission probability of 166Ho. 3166000200008 ANALYSIS The thermal neutron cross section of the reaction 3166000200009 was deduced from the ratio of the sub-cadmium 3166000200010 reaction rates to the thermal neutron flux. The same 3166000200011 was also determined from the ratio of subcadmium 3166000200012 reaction rates of holmium to the same ratio of the 3166000200013 co-irradiated cobalt monitor, subsequently 3166000200014 multiplied with the thermal cross section of 59Co. 3166000200015 ENDBIB 13 0 3166000200016 COMMON 2 3 3166000200017 ERR-1 ERR-2 3166000200018 PER-CENT PER-CENT 3166000200019 2.5 1.2 3166000200020 ENDCOMMON 3 0 3166000200021 DATA 3 1 3166000200022 EN-DUMMY DATA ERR-T 3166000200023 EV B B 3166000200024 0.0253 58.98 2.10 3166000200025 ENDDATA 3 0 3166000200026 ENDSUBENT 25 0 3166000299999 SUBENT 31660003 20090211 31333166000300001 BIB 2 5 3166000300002 REACTION (67-HO-165(N,G)67-HO-166-G,,RI) 3166000300003 ANALYSIS The resonance integral of the reaction was measured 3166000300004 by using the cadmium ratios. The weighted mean of 3166000300005 the measured cadmium ratios of the selected gamma 3166000300006 rays were taken. 3166000300007 ENDBIB 5 0 3166000300008 NOCOMMON 0 0 3166000300009 DATA 3 1 3166000300010 EN-MIN DATA ERR-T 3166000300011 EV B B 3166000300012 0.55 657. 36. 3166000300013 ENDDATA 3 0 3166000300014 ENDSUBENT 13 0 3166000399999 ENDENTRY 3 0 3166099999999