ENTRY 31678 20090819 31393167800000001 SUBENT 31678001 20090819 31393167800100001 BIB 14 58 3167800100002 TITLE Measurement of capture cross sections of 238U on the 3167800100003 filtered keV-neutron beams 3167800100004 AUTHOR (Vuong Huu Tan,Nguyen Canh Hai,Nguyen Trong Hiep) 3167800100005 INSTITUTE (3VN DAL) 3167800100006 REFERENCE (R,INDC(VN)-8,1996) 3167800100007 FACILITY (REAC,3VN DAL) 3167800100008 INC-SOURCE Filtered neutron beams at the piercing channel of 3167800100009 the Dalat reactor were used. Its parameters: 3167800100010 Thermal neutrons with 98cmSi+10cmTi+ 35g/cm2S filter 3167800100011 combination and 1.8 x 10**7 n/cm2/s neutron flux 3167800100012 144 keV neutrons with 98cmSi+10cmTi+ 0.2g/cm2B10 filter3167800100013 combination and 1.2 x 10**7 n/cm2/s neutron flux 3167800100014 55 keV neutrons with 98cmSi+35g/cm2S+0.2g/cm2B10 filter3167800100015 combination and 4.0 x 10**6 n/cm2/s neutron flux 3167800100016 SAMPLE Natural uramium sample. Experiments are performed 3167800100017 with 197Au foils as a standard that is irradiated 3167800100018 simultaneously with 238U foils. The thickness of 3167800100019 238U foils is approximately 0.276 g/cm2 and 3167800100020 0.087g/cm2 for 197Au-foils. 3167800100021 MONITOR ((MONIT1)92-U-238(N,G)92-U-239,,SIG,,MXW) 3167800100022 ((MONIT2)92-U-238(N,TOT),,SIG) 3167800100023 ((MONIT3)79-AU-197(N,G)79-AU-198,,SIG) 3167800100024 ((MONIT4)79-AU-197(N,TOT),,SIG) 3167800100025 MONIT-REF ((MONIT1),Vuong Huu Tan,T,Vuong Huu Tan,1989) 3167800100026 Neutron Radiative Capture in the Unresolved Resonance 3167800100027 Region. Ph.D. Thesis, Kiev, 1989. 3167800100028 ((MONIT2)40924003,A.V.Murzin+,J,AE,62,(3),192,198703) 3167800100029 ((MONIT3),S.F.MUGHABGHAB+,B,NEUT.CS 1B,,1984) at therm.3167800100030 ((MONIT4),S.F.MUGHABGHAB+,B,NEUT.CS 1B,,1984) at therm.3167800100031 Neutron Cross Section. Vol. 1: Neutron Resonance 3167800100032 Parameters and Thermal Cross Sections. Academic Press 3167800100033 1984, Part B, Z=:61-100. 3167800100034 METHOD (ACTIV,STTA,FNB) Activation method. 3167800100035 DETECTOR (HPGE) Activity of uranium foils after irradiation 3167800100036 was measured by X-ray HPGe -spectrometer (50 mm2 3167800100037 sensitive area, FWHM=150 for 55Fe) which detects 75 3167800100038 keV gamma-rays from decay of 239U with half-life of 3167800100039 23.5 min. In order to measure activity of activated 3167800100040 Au-foils the HPGe-70 cc detector was used with 3167800100041 FWHM=2.5 keV at 1332 keV gamma transmission of 60Co. 3167800100042 ERR-ANALYS (ERR-T) total uncertainty includes: 3167800100043 (ERR-2,,0.05) Time 3167800100044 (ERR-3,,0.5) Corrections for scattering and attenuation3167800100045 (ERR-4,,1.) Background 3167800100046 (ERR-5,,0.5) gamma-self absorption in samples 3167800100047 (ERR-6,,0.05) Weighting error of samples 3167800100048 (ERR-S,,2.) Counting statistics 3167800100049 * uncertainty in capture cross sections of Au for 3167800100050 thermal(th) and fast(keV) neutron: 3167800100051 0.09 (th); 1.9(144keV); 1.4 (55KeV) 3167800100052 * uncertainty in total cross sections of 197Au for 3167800100053 thermal(th) and fast(keV) neutrons: 3167800100054 0.15(th); 0.13(144keV); 0.86(55keV) 3167800100055 * uncertainty in total neutron cross sections of 3167800100056 238U for thermal(th) and fast(keV) neutrons: 3167800100057 0.1(th); 0.19(144keV); 0.38(55keV) 3167800100058 STATUS (TABLE) Data are taken from the Table 4 of the main ref3167800100059 HISTORY (20090819C) SD 3167800100060 ENDBIB 58 0 3167800100061 COMMON 9 6 3167800100062 EN-NRM MONIT1 MONIT1-ERR MONIT2 MONIT2-ERR MONIT3 3167800100063 MONIT3-ERR MONIT4 MONIT4-ERR 3167800100064 EV B B B B B 3167800100065 B B B 3167800100066 0.0253 2.7081 0.0095 12.068 0.121 98.65 3167800100067 0.09 106.49 0.016 3167800100068 ENDCOMMON 6 0 3167800100069 ENDSUBENT 68 0 3167800199999 SUBENT 31678002 20090819 31393167800200001 BIB 2 2 3167800200002 REACTION (92-U-238(N,G)92-U-239,,SIG) 3167800200003 DECAY-DATA (92-U-239,23.5MIN) 3167800200004 ENDBIB 2 0 3167800200005 NOCOMMON 0 0 3167800200006 DATA 9 2 3167800200007 EN DATA ERR-T MONIT2 MONIT2-ERR MONIT4 3167800200008 MONIT4-ERR MONIT3 MONIT3-ERR 3167800200009 KEV MB MB B B B 3167800200010 B MB MB 3167800200011 55. 292.3 8.5 13.343 0.051 11.60 3167800200012 0.10 433. 6. 3167800200013 144. 152.5 4.6 11.551 0.022 9.950 3167800200014 0.013 259. 5. 3167800200015 ENDDATA 8 0 3167800200016 ENDSUBENT 15 0 3167800299999 ENDENTRY 2 0 3167899999999