ENTRY 12531 20200430 14711253100000001 SUBENT 12531001 20200430 14711253100100001 BIB 13 31 1253100100002 TITLE Fission cross-sections for 243Pu, 250Bk, 247Cm, 245Cm, 1253100100003 254mEs and 254Es, and odd-odd systematics 1253100100004 AUTHOR (H.Diamond,J.J.Hines,R.K.Sjoblom,R.F.Barnes,D.N.Metta, 1253100100005 J.L.Lerner,P.R.Fields) 1253100100006 REFERENCE (J,JIN,30,2553,1968) 1253100100007 #doi:10.1016/0022-1902(68)80379-3 1253100100008 INSTITUTE (1USAANL) 1253100100009 FACILITY (REAC,1USAANL) The East Thermal Column(graphite) of the1253100100010 Juggernaut reactor. 1253100100011 INC-SPECT Up to 10**11 neutrons /cm2/sec. A cadmium ratio, 1253100100012 taken with gold monitors, indicated 1.4% of the 1253100100013 neutrons were epithermal 18 in. from the core face, 1253100100014 where most of the work was done, and 0.16% of the 1253100100015 neutrons were epithermal 30 in. from the core face. 1253100100016 DETECTOR (D4PI,FISCH) Back-to-back fission counter. 1253100100017 METHOD (ASEP,BSPEC) The Argonne Isotope Separator, the low 1253100100018 background counting system, the high neutron flux. 1253100100019 ANALYSIS (DECAY) Computer analyses of the decay curves. 1253100100020 ERR-ANALYS (DATA-ERR) Errors, based upon standard deviations, 1253100100021 are estimates of the reproducibility of the 1253100100022 measurements at Juggernaut, with the assumptions 1253100100023 stated. The ambiguities implicit in the presence of 1253100100024 epithermal neutrons made repetitions to increase 1253100100025 precision unprofitable. 1253100100026 MONITOR (92-U-235(N,F),,SIG) Based on U-235 thermal fission. 1253100100027 STATUS (TABLE) Table II, page 2556. 1253100100028 HISTORY (19760804T) Translated from SCISRS. 1253100100029 (19841004A) Converted to reaction formalism. 1253100100030 (20200430A) BP: Updated to new date formats, lower 1253100100031 case and BIB section. Corrections according last 1253100100032 EXFOR rules and Dict. Added samples information. 1253100100033 ENDBIB 31 0 1253100100034 COMMON 1 3 1253100100035 MONIT 1253100100036 B 1253100100037 561.0 1253100100038 ENDCOMMON 3 0 1253100100039 ENDSUBENT 38 0 1253100199999 SUBENT 12531002 20200430 14711253100200001 BIB 3 8 1253100200002 REACTION (94-PU-243(N,F),,SIG,,MXW) 1253100200003 SAMPLE Plutonium that was largely 242Pu was further enriched 1253100200004 with the isotope separator to 99.98% 242Pu, 0.0051% 1253100200005 241Pu, and 0.0068% 239Pu. This was then irradiated in 1253100200006 the CP-5 reactor in order to prepare a sample of 1253100200007 243Pu, and purified from fission products by a 1253100200008 thenoyltrifluoroacetone (TTA) extraction. 1253100200009 DECAY-DATA (94-PU-243,4.955HR) 1253100200010 ENDBIB 8 0 1253100200011 NOCOMMON 0 0 1253100200012 DATA 3 1 1253100200013 EN-DUMMY DATA DATA-ERR 1253100200014 MEV B B 1253100200015 2.53E-08 1.96E+02 1.6E+01 1253100200016 ENDDATA 3 0 1253100200017 ENDSUBENT 16 0 1253100299999 SUBENT 12531003 20200430 14711253100300001 BIB 2 8 1253100300002 REACTION (96-CM-245(N,F),,SIG,,MXW) 1253100300003 SAMPLE The 245Cm samples were obtained by isotope separation 1253100300004 of a highly irradiated curium sample. 1253100300005 (96-CM-244,ENR=0.5693) 1253100300006 (96-CM-245,ENR=0.1283) 1253100300007 (96-CM-246,ENR=0.30) 1253100300008 (96-CM-247,ENR=0.001236) 1253100300009 (96-CM-248,ENR=0.00117) 1253100300010 ENDBIB 8 0 1253100300011 NOCOMMON 0 0 1253100300012 DATA 3 1 1253100300013 EN-DUMMY DATA DATA-ERR 1253100300014 MEV B B 1253100300015 2.53E-08 2.040E+03 8.0E+01 1253100300016 ENDDATA 3 0 1253100300017 ENDSUBENT 16 0 1253100399999 SUBENT 12531004 20200430 14711253100400001 BIB 2 8 1253100400002 REACTION (96-CM-247(N,F),,SIG,,MXW) 1253100400003 SAMPLE The 247Cm samples were obtained by isotope separation 1253100400004 of a highly irradiated curium sample. 1253100400005 (96-CM-244,ENR=0.0279) 1253100400006 (96-CM-245,ENR=0.178) 1253100400007 (96-CM-246,ENR=0.8128) 1253100400008 (96-CM-247,ENR=0.141) 1253100400009 (96-CM-248,ENR=0.01658) 1253100400010 ENDBIB 8 0 1253100400011 NOCOMMON 0 0 1253100400012 DATA 3 1 1253100400013 EN-DUMMY DATA DATA-ERR 1253100400014 MEV B B 1253100400015 2.53E-08 1.08E+02 5. 1253100400016 ENDDATA 3 0 1253100400017 ENDSUBENT 16 0 1253100499999 SUBENT 12531005 20200430 14711253100500001 BIB 2 6 1253100500002 REACTION (97-BK-250(N,F),,SIG,,MXW) 1253100500003 SAMPLE 249Bk was irradiated in the CP-5 rabbit to prepare a 1253100500004 sample of 250Bk, which was purified by (2-ethylhexyl) 1253100500005 orthophosphoric acid extraction, and aliquots were 1253100500006 mounted on platinum discs for fission counting and on 1253100500007 VYNS for beta counting. 1253100500008 ENDBIB 6 0 1253100500009 NOCOMMON 0 0 1253100500010 DATA 3 1 1253100500011 EN-DUMMY DATA DATA-ERR 1253100500012 MEV B B 1253100500013 2.53E-08 9.60E+02 1.50E+02 1253100500014 ENDDATA 3 0 1253100500015 ENDSUBENT 14 0 1253100599999 SUBENT 12531006 20200430 14711253100600001 BIB 3 5 1253100600002 REACTION (99-ES-254-M(N,F),,SIG,,MXW) 1253100600003 SAMPLE 254mEs was obtained from a short irradiation of 253Es 1253100600004 in the Savannah River Reactor, followed by isotope 1253100600005 separation. 1253100600006 DECAY-DATA (99-ES-254-M,39.3HR) 1253100600007 ENDBIB 5 0 1253100600008 NOCOMMON 0 0 1253100600009 DATA 3 1 1253100600010 EN-DUMMY DATA DATA-ERR 1253100600011 MEV B B 1253100600012 2.53E-08 1.840E+03 8.0E+01 1253100600013 ENDDATA 3 0 1253100600014 ENDSUBENT 13 0 1253100699999 SUBENT 12531007 20200430 14711253100700001 BIB 3 13 1253100700002 REACTION (99-ES-254(N,F),,SIG,,MXW) 1253100700003 SAMPLE Attempts to measure 254Es (276d) led to erroneous 1253100700004 results until an aged sample of einsteinium from an 1253100700005 extensive Savannah River Reactor irradiation was 1253100700006 obtained. In this sample the 255Es content (20.7d) 1253100700007 had decayed to the point where alpha particle pile-up 1253100700008 in the fission counter did not obscure the 1253100700009 neutron-induced fission activity. The quantity of 1253100700010 254Es in the sample was measured by comparing the 1 1253100700011 MeV gamma ray activity from the 250Bk in equilibrium 1253100700012 with 254Es to the gamma ray activity of a small, pure 1253100700013 254Es standard. 1253100700014 DECAY-DATA (99-ES-254-G,276.0D) 1253100700015 ENDBIB 13 0 1253100700016 NOCOMMON 0 0 1253100700017 DATA 3 1 1253100700018 EN-DUMMY DATA DATA-ERR 1253100700019 MEV B B 1253100700020 2.53E-08 3.060E+03 1.80E+02 1253100700021 ENDDATA 3 0 1253100700022 ENDSUBENT 21 0 1253100799999 ENDENTRY 7 0 1253199999999