ENTRY 20948 20150701 22432094800000001 SUBENT 20948001 20150701 22432094800100001 BIB 16 48 2094800100002 INSTITUTE (2UK LON) J.G.W. , A.H.M.A.H. 2094800100003 (2BLGMOL) A.F. 2094800100004 (3IRNTEH) D.A-G. 2094800100005 REFERENCE (S,IAEA-208,(2),191,1978) 2094800100006 AUTHOR (A.Fabry,J.G.Williams,A.H.M.A.Hannan, D.Azimi-Garakani)2094800100007 TITLE Intercomparison of the intermediate-energy standard 2094800100008 neutron fields at the NISUS and MOL-EE 2094800100009 facilities by means of absolute fission chambers. 2094800100010 FACILITY (REAC,2UK LON) Thermal column at the reactor at the 2094800100011 University of London Reactor Centre (NISUS). 2094800100012 INC-SOURCE (REAC) Natural uranium spherical shell in the 2094800100013 thermal column of the reactor. 2094800100014 INC-SPECT Intermediate-energy standard neutron field at 2094800100015 the NISUS facility. 2094800100016 SAMPLE .Vacuum evaporated oxides onto 0.13 mm thick polished 2094800100017 platinum backing. Sample mass of U-235 was 2094800100018 175 (+-1.4%) mu-g/cm2 and isotopic composition was: 2094800100019 U-235: 99.748+-0.003% U-238: 0.1261+10.0007% 2094800100020 U-234: 0.0608+-0.0012% U-236: 0.0652+-0.0012% 2094800100021 METHOD .Dual triple-scaler with multichannel analyzer. 2094800100022 DETECTOR (FISCH) Fission chambers. 2094800100023 PART-DET (FF) Fission fragments. 2094800100024 CORRECTION .Corrections for dead-time loss, undetected fragments, 2094800100025 fission in other isotopes have been applied. For 2094800100026 detailed information see table 4 in reference. 2094800100027 ERR-ANALYS (ERR-T) All uncertainties random at the 1 sigma 2094800100028 confidence level encompass propagation of, 2094800100029 * statistical errors tbl3 2094800100030 (ERR-2) uncertainty in target weight of U-235 2094800100031 (denominator) 2094800100032 * uncertainties in corrections and 2094800100033 (ERR-3,,0.4) errors in run-to-run flux level 2094800100034 normalization. 2094800100035 COMMENT .Run-to-run normalization factors have been obtained 2094800100036 from a weighted combination of the responses of the 2094800100037 two fission chamber monitors. 2094800100038 .Compiler's comment: - A neutron spectrum of the NISUS2094800100039 facility (close to Sig-Sig) is available in the 2094800100040 IRDF-2002 'Standard spectra' in IRDF-2002 collection 2094800100041 of the reactor spectra: 2094800100042 www-nds.iaea.org/irdf2002/index.htmlx 2094800100043 STATUS (TABLE) .Data from Tbl. V of IAEA-208,(2),191,1978. 2094800100044 HISTORY (19790511C) Cn. 2094800100045 (19790626E) 2094800100046 (20150701A) SD:Updated to new date formats,lower case. 2094800100047 Corrections according last EXFOR rules and Dict. 2094800100048 Information about reactor spectra was added to COMMENT.2094800100049 Minor corrections in all Subents. BIB update. 2094800100050 ENDBIB 48 0 2094800100051 COMMON 2 3 2094800100052 EN-DUMMY ERR-2 2094800100053 MEV PER-CENT 2094800100054 5.0000E-01 1.4 2094800100055 ENDCOMMON 3 0 2094800100056 ENDSUBENT 55 0 2094800199999 SUBENT 20948002 20150701 22432094800200001 BIB 4 9 2094800200002 REACTION ((94-PU-239(N,F),,SIG,,SPA)/ 2094800200003 (92-U-235(N,F),,SIG,,SPA)) 2094800200004 REL-REF (A,20947002,A.Fabry+,S,IAEA-208,(2),291,1978) - results2094800200005 of MOL-SS facility in Belgium 2094800200006 ERR-ANALYS (ERR-1) uncertainty in target weight of numerator 2094800200007 SAMPLE Sample mass of Pu-239 was 83. (+-1.4%) mu-g/cm2 and 2094800200008 isotopic composition was: 2094800200009 Pu-239: 99.11+-0.01% Pu-240: 0.880+-0.005% 2094800200010 .Description of U-235 see in Subent 1. 2094800200011 ENDBIB 9 0 2094800200012 NOCOMMON 0 0 2094800200013 DATA 3 1 2094800200014 DATA ERR-T ERR-1 2094800200015 NO-DIM PER-CENT PER-CENT 2094800200016 1.1750E+00 2.3000E+00 1.4 2094800200017 ENDDATA 3 0 2094800200018 ENDSUBENT 17 0 2094800299999 SUBENT 20948003 20150701 22432094800300001 BIB 4 13 2094800300002 REACTION ((92-U-238(N,F),,SIG,,SPA)/ 2094800300003 (92-U-235(N,F),,SIG,,SPA)) 2094800300004 REL-REF (A,20947011,A.Fabry+,S,IAEA-208,(2),291,1978) - results2094800300005 of MOL-SS facility in Belgium 2094800300006 SAMPLE Two samples were used: 2094800300007 1. Sample mass of natural U-238 was 2094800300008 541.5 (+-1.4%) mu-g/cm2 and isotopic composition was:2094800300009 U-238: 99.275% U-235: 0.720+0.001% 2094800300010 2. Sample mass of depleted U-238 was 2094800300011 514. (+-2.2%) mu-g/cm2 and isotopic composition was: 2094800300012 U-238: 99.999% U-235: ~0.0001% 2094800300013 .Description of U-235 see in Subent 1. 2094800300014 ERR-ANALYS (ERR-1,1.4,2.2) error in target weight of numerator 2094800300015 ENDBIB 13 0 2094800300016 NOCOMMON 0 0 2094800300017 DATA 2 1 2094800300018 DATA ERR-T 2094800300019 NO-DIM PER-CENT 2094800300020 5.6800E-02 2.7 2094800300021 ENDDATA 3 0 2094800300022 ENDSUBENT 21 0 2094800399999 SUBENT 20948004 20150701 22432094800400001 BIB 4 9 2094800400002 REACTION ((93-NP-237(N,F),,SIG,,SPA)/ 2094800400003 (92-U-235(N,F),,SIG,,SPA)) 2094800400004 REL-REF (A,20947012,A.Fabry+,S,IAEA-208,(2),291,1978) - results2094800400005 of MOL-SS facility in Belgium 2094800400006 SAMPLE Sample mass of Np-237 was 497. (+-1.8%) mu-g/cm2 2094800400007 and isotopic composition was: 2094800400008 Np-237: 99.3+-0.1% Pu-239: 0.68+0.02% 2094800400009 .Description of U-235 see in Subent 1. 2094800400010 ERR-ANALYS (ERR-1) uncertainty in target weight of numerator 2094800400011 ENDBIB 9 0 2094800400012 NOCOMMON 0 0 2094800400013 DATA 3 1 2094800400014 DATA ERR-T ERR-1 2094800400015 NO-DIM PER-CENT PER-CENT 2094800400016 3.8300E-01 3. 1.8 2094800400017 ENDDATA 3 0 2094800400018 ENDSUBENT 17 0 2094800499999 ENDENTRY 4 0 2094899999999