ENTRY 30829 20120917 31583082900000001 SUBENT 30829001 20120917 31583082900100001 BIB 17 32 3082900100002 TITLE Measurements of Thermal Neutron Capture Cross Sections 3082900100003 of Low Abundance Stable Isotopes 3082900100004 AUTHOR (J.Y.Lee, Y.D.Kim, W.G.Kang, M.S.Kim, G.M.Sun) 3082900100005 INSTITUTE (3KORKOR) Sejong University, Seoul 3082900100006 (3KORKAE) 3082900100007 REFERENCE (J,KPS,59,1932,2011) 3082900100008 FACILITY (REAC,3KORKAE) BNCT facility of HANARO research reactor3082900100009 INC-SOURCE (THCOL) Thermal neutron flux: 3082900100010 7 - 8x10**8 neutrons/sec/cm**2 3082900100011 SAMPLE (64-GD-152,NAT=0.0020) Natural Gadolinium foil 3082900100012 - Size: 25. x 25. x 0.025 mm**3 3082900100013 - Purity: 99.9% 3082900100014 - Weight: 122.6 mg 3082900100015 METHOD (ACTIV) Irradiated for 4 hours 3082900100016 (GSPEC) 1 day waiting time to reduce the activity of 3082900100017 the foil 3082900100018 DETECTOR (HPGE) Be-window HPGe detector 3082900100019 MONITOR (64-GD-158(N,G)64-GD-159,,SIG) 3082900100020 DECAY-MON (64-GD-159,18.479HR,DG,363.5,0.0011) 3082900100021 MONIT-REF (,S.F.Mughabghab,B,NEUT.RES,,2006) 3082900100022 ERR-ANALYS (ERR-T) Dominated by the monitor cross section 3082900100023 uncertainty 3082900100024 ADD-RES (STRUC) T(1/2)=18.461+/-0.337 hours for Gd-159 3082900100025 COMMENT By J.Y.Lee (2012-10-15): 3082900100026 Fast and epithermal neutrons were eliminated through 3082900100027 a silicon single crystal cooled by liquid nitrogen. 3082900100028 A bismuth crystal was used after the silicon crystal 3082900100029 as a gamma-ray filter. Deviation from the thermal 3082900100030 cross section due to this process could be ~1%, which 3082900100031 is negligible compared with the uncertainty 9.4%. 3082900100032 STATUS (APRVD) Corrected by J.Y.Lee (2012-10-16) 3082900100033 HISTORY (20120917C) S.C.Yang 3082900100034 ENDBIB 32 0 3082900100035 COMMON 2 3 3082900100036 MONIT MONIT-ERR 3082900100037 B B 3082900100038 2.2 0.2 3082900100039 ENDCOMMON 3 0 3082900100040 ENDSUBENT 39 0 3082900199999 SUBENT 30829002 20120917 31583082900200001 BIB 4 6 3082900200002 REACTION (64-GD-152(N,G)64-GD-153,,SIG) 3082900200003 DECAY-DATA (64-GD-153,240.4D,DG,97.4,0.0029, 3082900200004 DG,103.2,0.0021) 3082900200005 ANALYSIS Weighted mean of 623.4+/-19.5 b (from 97.4 keV gamma 3082900200006 peak) and 602.8+/-22.8 b (from 103.2 keV gamma peak) 3082900200007 STATUS (TABLE) Abstract of J.Kor.Phys.Soc.59(2011)1932 3082900200008 ENDBIB 6 0 3082900200009 NOCOMMON 0 0 3082900200010 DATA 3 1 3082900200011 EN DATA ERR-T 3082900200012 EV B B 3082900200013 0.0253 614.7 57.8 3082900200014 ENDDATA 3 0 3082900200015 ENDSUBENT 14 0 3082900299999 ENDENTRY 2 0 3082999999999