ENTRY 12428 20160922 14241242800000001 SUBENT 12428001 20160922 14241242800100001 BIB 9 33 1242800100002 TITLE The ratio of capture to fission in U235 and Pu239 1242800100003 AUTHOR (R.W.Durham,G.C.Hanna,M.Lounsbury,C.B.Bigham,R.G.Hart, 1242800100004 R.W.Jones) 1242800100005 REFERENCE (C,66PARIS,2,17(2),196610) Primary reference. 1242800100006 (P,EANDC(CAN)-17,4,196310) 1242800100007 INSTITUTE (1CANCRC) 1242800100008 FACILITY (REAC,1CANCRC) NRU flux 2.5*10**14 n/cm2/sec2. 1242800100009 INC-SPECT Spectrum approximately Maxwellian. 1242800100010 MONITOR (92-U-235(N,ABS),,SIG) 1242800100011 METHOD (INTB,CHSEP) In the first irradiation a sample of 1242800100012 natural uranium was irradiated bare and a sample of 1242800100013 enriched 235U was irradiated under cadmium. The 1242800100014 arrangements for the second irradiation were similar 1242800100015 except that both the bare natural uranium and 1242800100016 cadmium-covered enriched uranium were accompanied by 1242800100017 sample of PuO2. After cooling, the capsules were cut 1242800100018 open and the irradiated samples dissolved in nitric 1242800100019 acid. The solutions of the uranium samples were 1242800100020 analyzed for plutonium by alpha counting, and for 1242800100021 uranium by colorimetry using KCNS; this Pu/U analysis 1242800100022 measured the destruction of U during the course of 1242800100023 the irradiation. Purified uranium samples were 1242800100024 prepared from these solutions for isotopic analysis 1242800100025 by mass spectrometry. The irradiated plutonium 1242800100026 samples were purified and analyzed 1242800100027 mass-spectrometrically; 241Am was removed immediately 1242800100028 before analysis. 1242800100029 HISTORY (19760804T) Translated from SCISRS. 1242800100030 (19830809A) Converted to reaction formalism. 1242800100031 (19860828A) BIB update. Subentries 7,8 deleted, 1242800100032 duplicate data. 1242800100033 (20160922A) BP: Updated to new date formats, added 1242800100034 error analysis and corrected all subentries.1242800100035 ENDBIB 33 0 1242800100036 COMMON 2 3 1242800100037 MONIT MONIT-ERR 1242800100038 B B 1242800100039 680.57 2.70 1242800100040 ENDCOMMON 3 0 1242800100041 ENDSUBENT 40 0 1242800199999 SUBENT 12428002 20160922 14241242800200001 BIB 5 14 1242800200002 REACTION (92-U-235(N,ABS),,ALF) 1242800200003 SAMPLE Bare samples considered: The samples, located at 1242800200004 opposite ends of an aluminum capsule, each consisted 1242800200005 of about 25 mg U3O8 spread out over an area of about 1242800200006 1.1 cm in a small aluminum can. The capsule was 1242800200007 irradiated close enough to the central plane of the 1242800200008 reactor for the effects of the vertical flux gradient 1242800200009 to be negligible. 1242800200010 ANALYSIS Maxwellian sigma for 2 runs=(0.1790+-0.0033) and 1242800200011 (0.1787+-0.0017), corrected to 2200 m/sec using 1242800200012 Westcott formalism and g and s from Critoph, CRRP- 1242800200013 1191(1964). 1242800200014 ERR-ANALYS (DATA-ERR) No details on sources of uncertainties. 1242800200015 STATUS (TABLE) page 22 of C,66PARIS,2,17(2),1966. 1242800200016 ENDBIB 14 0 1242800200017 NOCOMMON 0 0 1242800200018 DATA 3 1 1242800200019 EN DATA DATA-ERR 1242800200020 MEV NO-DIM NO-DIM 1242800200021 2.53E-08 1.765E-01 1.5E-03 1242800200022 ENDDATA 3 0 1242800200023 ENDSUBENT 22 0 1242800299999 SUBENT 12428003 20160922 14241242800300001 BIB 5 15 1242800300002 REACTION (92-U-235(N,G)92-U-236,,RI) 1242800300003 SAMPLE Cadmium-covered samples considered: The samples, 1242800300004 located at opposite ends of an aluminum capsule, each 1242800300005 consisted of about 25 mg U3O8 spread out over an area 1242800300006 of about 1.1 cm in a small aluminum can. 1242800300007 METHOD (ACTIV) The enriched sample was enclosed in a cadmium 1242800300008 box 0.8 mm thick, 1.3 cm diameter and 1. 3 cm high, 1242800300009 located about 6 cm below the bare sample. The capsule 1242800300010 was irradiated close enough to the central plane of 1242800300011 the reactor for the effects of the vertical flux 1242800300012 gradient to be negligible. 1242800300013 ERR-ANALYS (DATA-ERR) Incomplete description. 1242800300014 (ERR-1) The experimental uncertainty is almost 1242800300015 entirely associated with the epithermal flux. 1242800300016 STATUS (TABLE) page 23 of C,66PARIS,2,17(2),1966. 1242800300017 ENDBIB 15 0 1242800300018 COMMON 1 3 1242800300019 ERR-1 1242800300020 PER-CENT 1242800300021 4.0 1242800300022 ENDCOMMON 3 0 1242800300023 DATA 3 1 1242800300024 EN-MIN DATA DATA-ERR 1242800300025 EV B B 1242800300026 5.E-01 1.43E+02 7. 1242800300027 ENDDATA 3 0 1242800300028 ENDSUBENT 27 0 1242800399999 SUBENT 12428004 20160922 14241242800400001 BIB 6 12 1242800400002 REACTION (94-PU-239(N,ABS),,SIG) 1242800400003 SAMPLE Samples of PuO2 (~1 mg/cm2) containing approximately 1242800400004 10% of 242Pu. 1242800400005 ANALYSIS Maxwellian sigma=1188.5+-9.0 b, corrected to 2200 m/sec1242800400006 using Westcott (g+rs)=(1.073+-0.0562). 1242800400007 ERR-ANALYS (DATA-ERR) Incomplete description. 1242800400008 (ERR-1) The uncertainties in the mass spectrometer 1242800400009 analysis. 1242800400010 CORRECTION The cross-section values include a correction of 0.6% 1242800400011 to allow for the flux depression in the plutonium 1242800400012 sample. 1242800400013 STATUS (TABLE) page 25 of C,66PARIS,2,17(2),1966. 1242800400014 ENDBIB 12 0 1242800400015 COMMON 1 3 1242800400016 ERR-1 1242800400017 PER-CENT 1242800400018 0.31 1242800400019 ENDCOMMON 3 0 1242800400020 DATA 3 1 1242800400021 EN DATA DATA-ERR 1242800400022 MEV B B 1242800400023 2.53E-08 1.021E+03 1.2E+01 1242800400024 ENDDATA 3 0 1242800400025 ENDSUBENT 24 0 1242800499999 SUBENT 12428005 20160922 14241242800500001 BIB 6 14 1242800500002 REACTION (94-PU-239(N,ABS),,ALF) 1242800500003 SAMPLE Samples of PuO2 (~1 mg/cm2) containing approximately 1242800500004 10% of 242Pu. 1242800500005 ANALYSIS Maxwellian alpha=0.4138+-0.0047, corrected to 2200 1242800500006 m/sec value using Westcott formalism and (g+rs)= 1242800500007 (1.1078+-0.0562) for absorption and 1242800500008 (1.0755+-0.0435) for fission. 1242800500009 ERR-ANALYS (DATA-ERR) Incomplete description. 1242800500010 (ERR-1) The uncertainties in the mass spectrometer 1242800500011 analysis. 1242800500012 CORRECTION The cross-section values include a correction of 0.6% 1242800500013 to allow for the flux depression in the plutonium 1242800500014 sample. 1242800500015 STATUS (TABLE) page 25 of C,66PARIS,2,17(2),1966. 1242800500016 ENDBIB 14 0 1242800500017 COMMON 1 3 1242800500018 ERR-1 1242800500019 PER-CENT 1242800500020 0.66 1242800500021 ENDCOMMON 3 0 1242800500022 DATA 3 1 1242800500023 EN DATA DATA-ERR 1242800500024 MEV NO-DIM NO-DIM 1242800500025 2.53E-08 3.597E-01 4.6E-03 1242800500026 ENDDATA 3 0 1242800500027 ENDSUBENT 26 0 1242800599999 SUBENT 12428006 20160922 14241242800600001 BIB 6 14 1242800600002 REACTION (94-PU-239(N,F),,SIG) 1242800600003 SAMPLE Samples of PuO2 (~1 mg/cm2) containing approximately 1242800600004 10% of 242Pu. 1242800600005 ANALYSIS From measurement of alpha and absorption in 1242800600006 Maxwellian spectrum. Maxwellian sigma=840.6+-8.4b, 1242800600007 corrected to 2200 m/sec value using Westcott 1242800600008 (g+rs)=(1.077+-0.0435) 1242800600009 ERR-ANALYS (DATA-ERR) Incomplete description. 1242800600010 (ERR-1) The uncertainties in the mass spectrometer 1242800600011 analysis. 1242800600012 CORRECTION The cross-section values include a correction of 0.6% 1242800600013 to allow for the flux depression in the plutonium 1242800600014 sample. 1242800600015 STATUS (TABLE) page 25 of C,66PARIS,2,17(2),1966. 1242800600016 ENDBIB 14 0 1242800600017 COMMON 1 3 1242800600018 ERR-1 1242800600019 PER-CENT 1242800600020 0.50 1242800600021 ENDCOMMON 3 0 1242800600022 DATA 3 1 1242800600023 EN DATA DATA-ERR 1242800600024 MEV B B 1242800600025 2.53E-08 7.51E+02 1.0E+01 1242800600026 ENDDATA 3 0 1242800600027 ENDSUBENT 26 0 1242800699999 NOSUBENT 12428007 19860828 00001242800700001 NOSUBENT 12428008 19860828 00001242800800001 ENDENTRY 8 0 1242899999999