ENTRY 41490 20070228 41404149000000001 SUBENT 41490001 20070228 41404149000100001 BIB 12 47 4149000100002 TITLE Neutron Cross-Section Measurements of 232-Th in the 4149000100003 Energy Region 10 eV - 10 keV. 4149000100004 AUTHOR (ZH.V.MEZENTSEVA, V.N.SHVETSHOV, W.I.FURMAN, 4149000100005 H.FAIKOV-STANCZYK, YU.V.GRIGORIEV, V.YA.KITAEV, 4149000100006 V.V.SINITSA, B.V.ZHURAVLEV, G.N.KIM) 4149000100007 INSTITUTE (4ZZZDUB) Zh.Mezentseva, V.Shvetshov, W.Furman - 4149000100008 Frank Laboratory of Neutron Physics. 4149000100009 (3POLLOU) H.Faikov-Stanczyk 4149000100010 (4RUSFEI) Yu.Grigoriev,V.Kitaev,V.Sinitsa B.Zhuravlev 4149000100011 (3KORKNU) G.N.Kim - Institute of High Energy Physics 4149000100012 REFERENCE (J,KPS,43,(5),704,2003) Main Reference 4149000100013 FACILITY (REAC,4ZZZDUB) Reactor IBR-30 4149000100014 INC-SOURCE (REAC)IBR-30 pulsed neutron source consist of 4149000100015 subcritical reactor and 40-MeV electron linear 4149000100016 accelerator. Mean Power of 10 kW. Neutron Pulse Width 4149000100017 of 4 Microsec. Pulse repetition rate 100 Hz. 4149000100018 Water moderator to modify neutron spectrum. 4149000100019 METHOD (TOF) Time-Of-Flight, Flight path 124 m 4149000100020 Gamma rays spectra and neutron time-of-flight spectra 4149000100021 were measured. 4149000100022 (GSPEC) Multiplicity Spectrometry 4149000100023 (COINC) Gamma time-of-flight spectra were obtained for 4149000100024 the coincidence multiplicities from 1 to 16. 4149000100025 DETECTOR (BF3) BF3 proportional counter -for neutron flux 4149000100026 monitoring. Placed in the beam. 4149000100027 Battery of tree boron proportional counters SNM-13 of4149000100028 0.5cm diameter and 6 cm length placed in 124-m flight4149000100029 path to measure the neutron time-of-flight spectrum. 4149000100030 Polyethylene moderator of 10cm diameter and 1.5cm 4149000100031 thickness, placed in front of boron counters. 4149000100032 (STANK) 16-Section Liquid Scintillation Detector 4149000100033 Consisting of 86% Tholuol(C6H5CH3) and, 4149000100034 Enriched to 94% in B-10,14% Trimethilborate(B(OCH3)3).4149000100035 Liquid scintillator was contained in Two 40-Liter 4149000100036 cylindrical Tanks, Each Consisted of eight sections, 4149000100037 separated by 2 mm Aluminium. Each section was viewed 4149000100038 by FEU-100 photomultiplier. 4149000100039 Total gamma detection efficiency about 30%. 4149000100040 (HPGE) High-purity germanium detector of efficiency 4149000100041 about 7-8%, inside the 10cm-thick lead shielding of 4149000100042 scintillation detector, at 20cm from capture sample. 4149000100043 Used to measure the gamma-ray amplitude of capture 4149000100044 samples. 4149000100045 ERR-ANALYS (ERR-T) Total uncertainty 4149000100046 MISC-COL (MISC1) Total uncertainty in per-cents. 4149000100047 STATUS (COREL,41489001) 4149000100048 HISTORY (20070228C) Compiled at CJD. M.M. 4149000100049 ENDBIB 47 0 4149000100050 NOCOMMON 0 0 4149000100051 ENDSUBENT 50 0 4149000199999 SUBENT 41490002 20070228 41404149000200001 BIB 4 13 4149000200002 REACTION (90-TH-232(N,G)90-TH-233,,SIG,,AV)Group average capture4149000200003 cross-section 4149000200004 SAMPLE Two plates of metallic thorium of 0.2 mm (0.00665 4149000200005 atoms/barn) total thickness and size 4.5cm*4.5cm,placed4149000200006 at 121 m from neutron source in center of liquid 4149000200007 scintillation detector. 4149000200008 U3O8 powder with U-238 (99.999% pure), 3.86g weight, 4149000200009 contained in alumnium cylinder with 46mm inner diameter4149000200010 and 2mm (0.000498 atoms/barn) thickness. 4149000200011 MONITOR ((MONIT)92-U-238(N,G)92-U-239,,SIG) 4149000200012 U-238 group cross-section was calculated using 4149000200013 ENDF/B-VI evaluated library by GRUCON code. 4149000200014 STATUS Data from Table 1 of Main Reference 4149000200015 ENDBIB 13 0 4149000200016 NOCOMMON 0 0 4149000200017 DATA 6 8 4149000200018 EN-MIN EN-MAX DATA ERR-T MISC1 MONIT 4149000200019 EV EV B B PER-CENT B 4149000200020 21.5 46.5 57.0 5.0 8.8 54.2 4149000200021 46.5 100. 20.3 2.0 9.9 16.6 4149000200022 100. 215. 19.9 3.0 15.1 20.3 4149000200023 215. 465. 5.84 0.60 10.3 4.55 4149000200024 465. 1000. 3.96 0.40 10.1 3.32 4149000200025 1000. 2150. 2.34 0.20 8.5 1.70 4149000200026 2150. 4650. 1.70 0.20 11.8 1.24 4149000200027 4650. 10000. 0.86 0.10 11.6 0.81 4149000200028 ENDDATA 10 0 4149000200029 ENDSUBENT 28 0 4149000299999 SUBENT 41490003 20070228 41404149000300001 BIB 4 9 4149000300002 REACTION (90-TH-232(N,TOT),,SIG,,AV) 4149000300003 Group average total cross-section 4149000300004 SAMPLE Metallic thorium discs of 5mm (0.01303atoms/barn), 4149000300005 10mm (0.02655atoms/barn) and 20mm (0.0517atoms/barn), 4149000300006 insertad at 115m from neutron source. 4149000300007 Neutron beam transmitted through sample of known 4149000300008 thickness and without sample was measured. 4149000300009 CORRECTION For multiple scattering. 4149000300010 STATUS Data from Table 2 of Main Reference 4149000300011 ENDBIB 9 0 4149000300012 NOCOMMON 0 0 4149000300013 DATA 5 9 4149000300014 EN-MIN EN-MAX DATA ERR-T MISC1 4149000300015 EV EV B B PER-CENT 4149000300016 10.0 21.5 12.4 0.6 4.8 4149000300017 21.5 46.5 74.6 4.0 5.4 4149000300018 46.5 100. 71.8 3.0 4.2 4149000300019 100. 215. 45.3 1.5 3.3 4149000300020 215. 465. 33.5 1.3 3.9 4149000300021 465. 1000. 24.9 1.1 4.4 4149000300022 1000. 2150. 21.9 0.9 4.1 4149000300023 2150. 4650. 19.6 0.9 4.6 4149000300024 4650. 10000. 17.7 0.8 4.5 4149000300025 ENDDATA 11 0 4149000300026 ENDSUBENT 25 0 4149000399999 ENDENTRY 3 0 4149099999999