ENTRY L0160 20110711 L016L016000000001 SUBENT L0160001 20110711 L016L016000100001 BIB 13 43 L016000100002 TITLE Transmission nuclear resonance fluorescence L016000100003 measurements of 238U in thick targets L016000100004 AUTHOR (B.J.Quiter,B.A.Ludewigt,V.V.Mozin,C.Wilson,S.Korbly) L016000100005 INSTITUTE (1USABRK,1USALAS) L016000100006 (1USAUSA)Passport Systems Inc., Bilerica, MassachusettsL016000100007 REFERENCE (J,NIM/B,269,1130,2011) L016000100008 FACILITY (VDG,1USAMIT) Experiment was conducted at the High L016000100009 Voltage Research Laboratory at Massachusetts L016000100010 Institute of Technology. L016000100011 SAMPLE (92-U-238,ENR=0.998) Transmission detector sheet L016000100012 consisted of five depleted uranium (DU) sheets with L016000100013 dimensions of 20.32 cm x 20.32 cm and thickness of L016000100014 0.8 mm. Behind the DU plates, 82.3 +- 0.5 g of Mn and L016000100015 185.1 +- 0.8 g of 99.52% enriched 11B were also L016000100016 positioned in the beam to serve as auxiliary flux L016000100017 monitors. Total mass of DU plates was 3226.7 +- 28 g. L016000100018 DETECTOR (HPGE) Two pairs of approximately 100% relative L016000100019 efficiency high-purity germanium detectors were L016000100020 positioned 27 cm from the intersection of the beam L016000100021 center and the transmission detection sheet, at an L016000100022 angle of 118deg relative to the centroid beam L016000100023 direction. L016000100024 METHOD (TRN,GSPEC) The assay target was used to down-scatter L016000100025 incident photon beam to the energy of resonance. L016000100026 The assay target consisting of combination of DU and PbL016000100027 was located directly downstream of the collimator L016000100028 opening. The areal densities of DU for different runs L016000100029 varied form 0 g/cm2 (background run) to 8.47g/cm2. L016000100030 The Pb densities varied from 79.85g/cm2 to 86.26g/cm2. L016000100031 MONITOR (4-BE-11(G,SCT),PAR,ARE) L016000100032 INC-SOURCE (BRST) Bremstrahlung produced by electrons L016000100033 accelerated to 2.60+-0.03 MeV in converter target L016000100034 consisting of a 102 mu-m thick Au layer on a 1 L016000100035 cm-thick water-cooled Cu backing. The electron L016000100036 current incident upon the converter was approximately L016000100037 65 mu-A throughout the experiment. L016000100038 ANALYSIS The photon spectra that reached the transmission L016000100039 detection sheet after emission from each of the assay L016000100040 targets were calculated by Monte-Carlo method using L016000100041 code MCNPX. L016000100042 ERR-ANALYS (DATA-ERR) Largest source of experimental errors are L016000100043 the uncertainties relating to counting statistics. L016000100044 HISTORY (20110711C) Compiled by S.H. L016000100045 ENDBIB 43 0 L016000100046 NOCOMMON 0 0 L016000100047 ENDSUBENT 46 0 L016000199999 SUBENT L0160002 20110711 L016L016000200001 BIB 3 3 L016000200002 REACTION (92-U-238(G,EL),,WID) L016000200003 MISC-COL (MISC) Gamma(1)W(1)/Gamma(0)W(0) L016000200004 STATUS (TABLE) Data taken from tab. 6 of the reference L016000200005 ENDBIB 3 0 L016000200006 NOCOMMON 0 0 L016000200007 DATA 5 8 L016000200008 EN-RES DATA DATA-ERR MISC MISC-ERR L016000200009 KEV MILLI-EV MILLI-EV NO-DIM NO-DIM L016000200010 2080. 4.97 5.25 2.39 0.63 L016000200011 2176. 30.59 4.50 0.55 0.06 L016000200012 2209. 30.83 5.71 0.53 0.07 L016000200013 2245. 23.14 7.48 0.52 0.09 L016000200014 2287. 37.60 30.37 0.41 0.32 L016000200015 2295. 7.14 11.00 0.92 0.23 L016000200016 2410. 10.56 13.98 0.60 0.16 L016000200017 2468. 24.25 22.67 0.72 0.26 L016000200018 ENDDATA 10 0 L016000200019 ENDSUBENT 18 0 L016000299999 ENDENTRY 2 0 L016099999999