ENTRY 21463 20071219 21902146300000001 SUBENT 21463001 20071219 21902146300100001 BIB 14 59 2146300100002 INSTITUTE (2UK ALD) 2146300100003 REFERENCE (C,65SALZBURG,1,219,196503) Paper Sm-60/14 2146300100004 AUTHOR (P.H.White,J.G.Hodgkinson,G.J.Wall) 2146300100005 TITLE -Measurement of fission cross sections for neutrons 2146300100006 of energies in the range 40-500 keV.- 2146300100007 FACILITY (VDG,2UK ALD) 5 MV Van de Graaff. 2146300100008 INC-SOURCE (P-LI7) Lithium-nitride targets 50-100 micro-grams/ 2146300100009 cm*cm thick, evaporated onto Ag backings and 2146300100010 bombarded with 60-70 micro-ampere protons. The 2146300100011 proton energy was stable within 3 keV. 2146300100012 SAMPLE .Some chemical separation was made using an ion 2146300100013 exchange technique. The foils were painted on to 2146300100014 platinum backings, 0.013 cm thick from an acetone 2146300100015 solution of the nitrate. Low geometry alpha counting 2146300100016 and coulometric assay were used to determine the 2146300100017 weight of the samples. More details about each sample 2146300100018 each subwork. Two U-235 samples were used. The 2146300100019 first one had an isotopic composition of 99.33% 2146300100020 of U-235, 0.11 % of U-234, 0.25% of U-236, and 2146300100021 0.31% of U-238, thickness 0.5 mg/cm*cm, assay 2146300100022 error 1.0 percent, impurity 2.4 percent. The 2146300100023 second one had a composition of 1.19 % of U-234, 2146300100024 92.95 % of U-235, 0.18 % of U-236, and 5.68 % of 2146300100025 U-238, thickness 0.5 mg/cm*cm, assay error 0.7%, 2146300100026 impurity 0.7 percent. 2146300100027 METHOD .Back-to-back foils of sample and U-235 in the 2146300100028 same neutron beam to compare the cross sections. 2146300100029 DETECTOR (FISCH) Fission chamber filled with mixture of 90 2146300100030 percent xenon and 10 percent C-O2 . 2146300100031 In some cases with high alpha background 2146300100032 a mixture of 90 percent krypton and 10 2146300100033 percent C-O(2) was used, at a lower pressure 2146300100034 of 200-400 torr. 2146300100035 PART-DET (FF) Fission fragments. 2146300100036 STATUS (NDD) Data taken from NEUDADA. 2146300100037 CORRECTION .For differences in the neutron flux upon sample 2146300100038 and monitor foil, for background from neutrons 2146300100039 scattered from the laboratory walls, for foil 2146300100040 thickness, for neutron flux and energy variation 2146300100041 across the fissile foil, for neutron scattering in 2146300100042 the fission counters and the neutron source. 2146300100043 ERR-ANALYS (ERR-S) Statistics 0.7 % (both sample + monitor), 2146300100044 (ERR-1) N-energy and flux variations across the 2146300100045 fissile foils (0.1 %) error 2146300100046 (ERR-2) Scattering corrections error (0.1 %), 2146300100047 (ERR-3) Max foil thickness correction error 2146300100048 (0.5-1.0 %), 2146300100049 (ERR-4) Max extrapolation error of the fission 2146300100050 fragment spectrum to zero bias (0.2-0.5 )% 2146300100051 (ERR-5) Error of assay of the foil (0.8 %), 2146300100052 (ERR-6) Uncertainty of the U-235(N,F) cross section 2146300100053 (3 %). 2146300100054 (ERR-7) Typical compound errors are 2. % of for 2146300100055 the ratio, 2146300100056 (ERR-T) Error 3.5 percent for the cross section. 2146300100057 HISTORY (19800311T) G.C. 2146300100058 (19800318E) 2146300100059 (20071218A) Date is corrected 2146300100060 (20071219U) Last corrections have been done - SM 2146300100061 ENDBIB 59 0 2146300100062 COMMON 9 6 2146300100063 ERR-1 ERR-2 ERR-3 ERR-4 ERR-5 ERR-6 2146300100064 ERR-7 ERR-S ERR-T 2146300100065 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 2146300100066 PER-CENT PER-CENT PER-CENT 2146300100067 0.1 0.1 1.0 0.5 0.8 3. 2146300100068 2. 0.7 3.5 2146300100069 ENDCOMMON 6 0 2146300100070 ENDSUBENT 69 0 2146300199999 SUBENT 21463002 20071219 21902146300200001 BIB 4 6 2146300200002 REACTION (92-U-233(N,F),,SIG) 2146300200003 SAMPLE .Composition of the sample was 99.67 % of U-233, 2146300200004 0.15 % of U-234, 0.18 % of U-238. Foil thickness 2146300200005 0.5 mg/cm*cm, assay error 0.8 %, impurity 2.0 % 2146300200006 MONITOR (92-U-235(N,F),,SIG) 2146300200007 STATUS (NDD) Data taken from NEUDADA. 2146300200008 ENDBIB 6 0 2146300200009 NOCOMMON 0 0 2146300200010 DATA 6 6 2146300200011 EN EN-RSL MONIT MONIT-ERR DATA DATA-ERR 2146300200012 KEV KEV B B B B 2146300200013 4.0000E+01 1.0000E+01 2.1000E+00 6.0000E-02 2.7400E+00 1.0000E-012146300200014 6.7000E+01 1.0000E+01 1.7900E+00 5.0000E-02 2.3700E+00 9.0000E-022146300200015 1.2700E+02 7.0000E+00 1.5400E+00 4.0000E-02 2.2200E+00 7.0000E-022146300200016 3.1200E+02 7.0000E+00 1.3000E+00 3.0000E-02 2.1500E+00 7.0000E-022146300200017 4.1500E+02 7.0000E+00 1.2200E+00 3.0000E-02 1.9700E+00 6.0000E-022146300200018 5.0500E+02 1.0000E+01 1.1700E+00 3.0000E-02 1.8500E+00 6.0000E-022146300200019 ENDDATA 8 0 2146300200020 ENDSUBENT 19 0 2146300299999 SUBENT 21463003 20071219 21902146300300001 BIB 4 8 2146300300002 REACTION (92-U-234(N,F),,SIG) 2146300300003 SAMPLE .Isotopic composition of the sample was 97.52 per- 2146300300004 cent U-234, 1.67 percent U-235, 0.03 percent U-236, 2146300300005 0.78 percent U-238. Foil thicknesses of 0.25 and 2146300300006 0.50 mg/cm*cm were used. Assay error of 0.8 percent, 2146300300007 impurity 6 percent. 2146300300008 MONITOR (92-U-235(N,F),,SIG) 2146300300009 STATUS (NDD) Data taken from NEUDADA. 2146300300010 ENDBIB 8 0 2146300300011 NOCOMMON 0 0 2146300300012 DATA 6 5 2146300300013 EN EN-RSL MONIT MONIT-ERR DATA DATA-ERR 2146300300014 KEV KEV B B B B 2146300300015 4.0000E+01 1.0000E+01 2.1000E+00 6.0000E-02 1.2000E-02 2.0000E-032146300300016 6.7000E+01 1.0000E+01 1.7900E+00 5.0000E-02 1.8000E-02 2.0000E-032146300300017 1.2700E+02 7.0000E+00 1.5400E+00 4.0000E-02 2.1000E-02 2.0000E-032146300300018 3.1200E+02 7.0000E+00 1.3000E+00 3.0000E-02 1.8600E-01 1.5000E-022146300300019 5.0500E+02 1.0000E+01 1.1700E+00 3.0000E-02 5.6000E-01 3.0000E-022146300300020 ENDDATA 7 0 2146300300021 ENDSUBENT 20 0 2146300399999 SUBENT 21463004 20071219 21902146300400001 BIB 4 8 2146300400002 REACTION (92-U-236(N,F),,SIG) 2146300400003 SAMPLE .Isotopic composition of the sample was 98.46 2146300400004 percent U-236, 0.01 percent U-234, 1.1 percent 2146300400005 U-235, 0.42 percent U-238. Foil thickness 0.4 2146300400006 mg/cm*cm, assay error 1. Percent, impurity 3. 2146300400007 Percent. 2146300400008 MONITOR (92-U-235(N,F),,SIG) 2146300400009 STATUS (NDD) Data taken from NEUDADA. 2146300400010 ENDBIB 8 0 2146300400011 NOCOMMON 0 0 2146300400012 DATA 6 3 2146300400013 EN EN-RSL MONIT MONIT-ERR DATA DATA-ERR 2146300400014 KEV KEV B B B B 2146300400015 1.2700E+02 7.0000E+00 1.5400E+00 4.0000E-02 1.8000E-03 9.0000E-042146300400016 3.1200E+02 7.0000E+00 1.3000E+00 3.0000E-02 3.7000E-03 1.4000E-032146300400017 5.0500E+02 1.0000E+01 1.1700E+00 3.0000E-02 6.9000E-03 6.0000E-042146300400018 ENDDATA 5 0 2146300400019 ENDSUBENT 18 0 2146300499999 SUBENT 21463005 20071219 21902146300500001 BIB 4 6 2146300500002 REACTION (93-NP-237(N,F),,SIG) 2146300500003 SAMPLE .Isotopic composition 100 % of Np-237, 0.05 % of 2146300500004 Pu-239, foil thickness 0.5 mg/cm*cm, assay error 2146300500005 0.75 %, impurity 5 % 2146300500006 MONITOR (92-U-235(N,F),,SIG) 2146300500007 STATUS (NDD) Data taken from NEUDADA. 2146300500008 ENDBIB 6 0 2146300500009 NOCOMMON 0 0 2146300500010 DATA 6 5 2146300500011 EN EN-RSL MONIT MONIT-ERR DATA DATA-ERR 2146300500012 KEV KEV B B B B 2146300500013 4.0000E+01 1.0000E+01 2.1000E+00 6.0000E-02 1.3000E-02 1.0000E-032146300500014 6.7000E+01 1.0000E+01 1.7900E+00 5.0000E-02 1.2000E-02 1.0000E-032146300500015 1.2700E+02 7.0000E+00 1.5400E+00 4.0000E-02 2.4000E-02 2.0000E-032146300500016 3.1200E+02 7.0000E+00 1.3000E+00 3.0000E-02 6.9000E-02 5.0000E-032146300500017 5.0500E+02 1.0000E+01 1.1700E+00 3.0000E-02 4.7000E-01 2.0000E-022146300500018 ENDDATA 7 0 2146300500019 ENDSUBENT 18 0 2146300599999 SUBENT 21463006 20071219 21902146300600001 BIB 4 7 2146300600002 REACTION (94-PU-239(N,F),,SIG) 2146300600003 SAMPLE .Isotopic composition 99.985 perc Pu-239, 0.012 2146300600004 perc Pu-240, 0.003 perc Pu-241, foil thicknesses 2146300600005 of 0.5 and 0.1 mg/cm*cm, assay error 0.5 perc, 2146300600006 impurity 14 perc. 2146300600007 MONITOR (92-U-235(N,F),,SIG) 2146300600008 STATUS (NDD) Data taken from NEUDADA. 2146300600009 ENDBIB 7 0 2146300600010 NOCOMMON 0 0 2146300600011 DATA 6 5 2146300600012 EN EN-RSL MONIT MONIT-ERR DATA DATA-ERR 2146300600013 KEV KEV B B B B 2146300600014 4.0000E+01 1.0000E+01 2.1000E+00 6.0000E-02 1.4500E+00 5.0000E-022146300600015 6.7000E+01 1.0000E+01 1.7900E+00 5.0000E-02 1.4600E+00 5.0000E-022146300600016 1.2700E+02 7.0000E+00 1.5400E+00 4.0000E-02 1.5100E+00 5.0000E-022146300600017 3.1200E+02 7.0000E+00 1.3000E+00 3.0000E-02 1.5200E+00 5.0000E-022146300600018 5.5000E+02 1.0000E+01 1.1700E+00 3.0000E-02 1.5600E+00 5.0000E-022146300600019 ENDDATA 7 0 2146300600020 ENDSUBENT 19 0 2146300699999 SUBENT 21463007 20071219 21902146300700001 BIB 4 7 2146300700002 REACTION (94-PU-241(N,F),,SIG) 2146300700003 SAMPLE .Isotopic composition 5.12 % of Pu-239, 5.53 % of 2146300700004 Pu-240, 88.95 % of Pu-241, 0.40 % of Pu-242, 2146300700005 foil thickness 0.25 mg/cm*cm, assay error 2.0% 2146300700006 impurity 16. % 2146300700007 MONITOR (92-U-235(N,F),,SIG) 2146300700008 STATUS (NDD) Data taken from NEUDADA. 2146300700009 ENDBIB 7 0 2146300700010 NOCOMMON 0 0 2146300700011 DATA 6 5 2146300700012 EN EN-RSL MONIT MONIT-ERR DATA DATA-ERR 2146300700013 KEV KEV B B B B 2146300700014 4.0000E+01 1.0000E+01 2.1000E+00 6.0000E-02 2.7600E+00 1.0000E-012146300700015 6.7000E+01 1.0000E+01 1.7900E+00 5.0000E-02 2.3800E+00 9.0000E-022146300700016 1.2700E+02 7.0000E+00 1.5400E+00 4.0000E-02 2.0900E+00 7.0000E-022146300700017 3.1200E+02 7.0000E+00 1.3000E+00 3.0000E-02 1.6800E+00 6.0000E-022146300700018 5.0500E+02 1.0000E+01 1.1700E+00 3.0000E-02 1.4700E+00 6.0000E-022146300700019 ENDDATA 7 0 2146300700020 ENDSUBENT 19 0 2146300799999 SUBENT 21463008 20071219 21902146300800001 BIB 3 5 2146300800002 REACTION ((92-U-233(N,F),,SIG)/(92-U-235(N,F),,SIG)) 2146300800003 SAMPLE .Isotopic composition 99.67 % of U-233, 0.15 % of 2146300800004 U-234, 0.18 % of U-238, foil thickness 0.5 mg/cm*cm, 2146300800005 assay error 0.8 %, impurity 2 % 2146300800006 STATUS (NDD) Data taken from NEUDADA. 2146300800007 ENDBIB 5 0 2146300800008 COMMON 1 3 2146300800009 DATA-ERR 2146300800010 PER-CENT 2146300800011 2.2 2146300800012 ENDCOMMON 3 0 2146300800013 DATA 3 6 2146300800014 EN EN-RSL DATA 2146300800015 KEV KEV NO-DIM 2146300800016 4.0000E+01 1.0000E+01 1.3000E+00 2146300800017 6.7000E+01 1.0000E+01 1.3300E+00 2146300800018 1.2700E+02 7.0000E+00 1.4400E+00 2146300800019 3.1200E+02 7.0000E+00 1.6600E+00 2146300800020 4.1500E+02 7.0000E+00 1.6200E+00 2146300800021 5.0500E+02 1.0000E+01 1.5800E+00 2146300800022 ENDDATA 8 0 2146300800023 ENDSUBENT 22 0 2146300899999 SUBENT 21463009 20071219 21902146300900001 BIB 3 6 2146300900002 REACTION ((92-U-234(N,F),,SIG)/(92-U-235(N,F),,SIG)) 2146300900003 SAMPLE .Isotopic composition 97.52 % of U-234, 1.67 % of 2146300900004 U-235, 0.03 % of U-236, 0.78 % of U-238, foil 2146300900005 thicknesses of 0.25 and 0.50 mg/cm*cm, assay 2146300900006 error 0.8 %, impurity 6.% 2146300900007 STATUS (NDD) Data taken from NEUDADA. 2146300900008 ENDBIB 6 0 2146300900009 NOCOMMON 0 0 2146300900010 DATA 4 5 2146300900011 EN EN-RSL DATA DATA-ERR 2146300900012 KEV KEV NO-DIM NO-DIM 2146300900013 4.0000E+01 1.0000E+01 6.0000E-03 1.0000E-03 2146300900014 6.7000E+01 1.0000E+01 1.0000E-02 1.0000E-03 2146300900015 1.2700E+02 7.0000E+00 1.4000E-02 2.0000E-03 2146300900016 3.1200E+02 7.0000E+00 1.4300E-01 7.0000E-03 2146300900017 5.0500E+02 1.0000E+01 4.7000E-01 2.0000E-02 2146300900018 ENDDATA 7 0 2146300900019 ENDSUBENT 18 0 2146300999999 SUBENT 21463010 20071219 21902146301000001 BIB 3 6 2146301000002 REACTION ((92-U-236(N,F),,SIG)/(92-U-235(N,F),,SIG)) 2146301000003 SAMPLE .Isotopic composition 0.01 % of U-234, 1.1 % of 2146301000004 U-235, 98.46 % of U-236, 0.42 % of U-238, foil 2146301000005 thickness 0.4 mg/cm*cm, assay error 1.0 %, 2146301000006 impurity 3. % 2146301000007 STATUS (NDD) Data taken from NEUDADA. 2146301000008 ENDBIB 6 0 2146301000009 NOCOMMON 0 0 2146301000010 DATA 4 3 2146301000011 EN EN-RSL DATA DATA-ERR 2146301000012 KEV KEV NO-DIM NO-DIM 2146301000013 1.2700E+02 7.0000E+00 1.2000E-03 6.0000E-04 2146301000014 3.1200E+02 7.0000E+00 2.8000E-03 1.1000E-03 2146301000015 5.0500E+02 1.0000E+01 5.9000E-03 6.0000E-04 2146301000016 ENDDATA 5 0 2146301000017 ENDSUBENT 16 0 2146301099999 SUBENT 21463011 20071219 21902146301100001 BIB 3 5 2146301100002 REACTION ((93-NP-237(N,F),,SIG)/(92-U-235(N,F),,SIG)) 2146301100003 SAMPLE .Isotopic composition 100. % of Np-237, 0.05 2146301100004 % of Pu-239, foil thickness 0.5 mg/cm*cm, assay 2146301100005 error 0.75 %, impurity 5 % 2146301100006 STATUS (NDD) Data taken from NEUDADA. 2146301100007 ENDBIB 5 0 2146301100008 NOCOMMON 0 0 2146301100009 DATA 4 5 2146301100010 EN EN-RSL DATA DATA-ERR 2146301100011 KEV KEV NO-DIM NO-DIM 2146301100012 4.0000E+01 1.0000E+01 6.0000E-03 5.0000E-04 2146301100013 6.7000E+01 1.0000E+01 6.4000E-03 3.0000E-04 2146301100014 1.2700E+02 7.0000E+00 1.5500E-02 8.0000E-04 2146301100015 3.1200E+02 7.0000E+00 5.3000E-02 4.0000E-03 2146301100016 5.0500E+02 1.0000E+01 4.0000E-01 9.0000E-03 2146301100017 ENDDATA 7 0 2146301100018 ENDSUBENT 17 0 2146301199999 SUBENT 21463012 20071219 21902146301200001 BIB 3 6 2146301200002 REACTION ((94-PU-239(N,F),,SIG)/(92-U-235(N,F),,SIG)) 2146301200003 SAMPLE .Isotopic composition 99.985 % of Pu-239, 0.012 2146301200004 % of Pu-240, 0.003 % of Pu-241, foil thicknesses 2146301200005 of 0.5 and 0.1 mg/cm*cm, assay error 0.5 %, 2146301200006 impurity 14. % 2146301200007 STATUS (NDD) Data taken from NEUDADA. 2146301200008 ENDBIB 6 0 2146301200009 COMMON 1 3 2146301200010 DATA-ERR 2146301200011 PER-CENT 2146301200012 2.2 2146301200013 ENDCOMMON 3 0 2146301200014 DATA 3 5 2146301200015 EN EN-RSL DATA 2146301200016 KEV KEV NO-DIM 2146301200017 4.0000E+01 1.0000E+01 6.9000E-01 2146301200018 6.7000E+01 1.0000E+01 8.1600E-01 2146301200019 1.2700E+02 7.0000E+00 9.8000E-01 2146301200020 3.1200E+02 7.0000E+00 1.1700E+00 2146301200021 5.0500E+02 1.0000E+01 1.3400E+00 2146301200022 ENDDATA 7 0 2146301200023 ENDSUBENT 22 0 2146301299999 SUBENT 21463013 20071219 21902146301300001 BIB 3 6 2146301300002 REACTION ((94-PU-241(N,F),,SIG)/(92-U-235(N,F),,SIG)) 2146301300003 SAMPLE .Isotopic composition 5.12 % of Pu-239, 5.53 % of 2146301300004 Pu-240, 88.95 % of Pu-241, 0.40 % of Pu-241, foil 2146301300005 thickness 0.25 mg/cm* cm, assay error 2.0 %, 2146301300006 impurity 16. % 2146301300007 STATUS (NDD) Data taken from NEUDADA. 2146301300008 ENDBIB 6 0 2146301300009 COMMON 1 3 2146301300010 DATA-ERR 2146301300011 PER-CENT 2146301300012 2.5 2146301300013 ENDCOMMON 3 0 2146301300014 DATA 3 5 2146301300015 EN EN-RSL DATA 2146301300016 KEV KEV NO-DIM 2146301300017 4.0000E+01 1.0000E+01 1.3100E+00 2146301300018 6.7000E+01 1.0000E+01 1.3300E+00 2146301300019 1.2700E+02 7.0000E+00 1.3600E+00 2146301300020 3.1200E+02 7.0000E+00 1.3000E+00 2146301300021 5.0500E+02 1.0000E+01 1.2600E+00 2146301300022 ENDDATA 7 0 2146301300023 ENDSUBENT 22 0 2146301399999 ENDENTRY 13 0 2146399999999