ENTRY 21644 20220209 23092164400000001 SUBENT 21644001 20220209 23092164400100001 BIB 16 48 2164400100002 TITLE Delayed neutron yields from fission of uranium-233, 2164400100003 neptunium-237, plutonium-238, -240, -241, and 2164400100004 americium-241 2164400100005 AUTHOR (G.Benedetti,A.Cesana,V.Sangiust,M.Terrani,G.Sandrelli)2164400100006 INSTITUTE (2ITYMIL) Politecnico Gi Milano and E.N.E.L. 2164400100007 REFERENCE (J,NSE,80,379,1982) - final publ. 2164400100008 (P,INDC(NDS)-113,33,1980) Brief report. 2164400100009 (W,CESANA,198010) Reply to data request questionaire 2164400100010 (J,EN,26,(11),542,1979) spectrum description. 2164400100011 FACILITY (REAC,2ITYMIL) L54 reactor. 2164400100012 INC-SOURCE (REAC) Irradiations in a B4C filtered flux at the 2164400100013 edge of l54 reactor core. 2164400100014 INC-SPECT Fast reactor neutron spectrum. 2164400100015 Details of spectrum in EN,26,(11),542,1979. 2164400100016 SAMPLE Samples were encapsulated in stainless steel or 2164400100017 zircaloy vials. 2164400100018 METHOD Samples transfered pneumatically from irradiation 2164400100019 position to neutron counters. 2164400100020 MONIT-REF (,B.F.Rider,R,NEDO-12154-3(A),1979) 2164400100021 DETECTOR (LONGC) Neutron long counter. The neutron efficiency W 2164400100022 was measured by counting the delayed neutron emission 2164400100023 from U-235 for which the fission rate in the 2164400100024 irradiation position had been accurately determined. 2164400100025 (GELI) Ge(Li) detector for monitoring activity of 2164400100026 fission products as a measure of the sample fission 2164400100027 rates. 2164400100028 ANALYSIS Delayed neutron curves were fitted by five groups 2164400100029 with half-lives of 55,22,6,2,0.5 secs using a least 2164400100030 squares unfolding technique. A correction was made 2164400100031 for a sixth, unobserved, group with half-life 0.2 sec 2164400100032 CORRECTION Delayed neutron intensities and fission product 2164400100033 yields were corrected for impurities. As the transfer 2164400100034 time to counting position was 0.6 sec, delayed 2164400100035 neutrons with half-lives less than 0.5 sec were not 2164400100036 observed. A correction for a sixth group with a half- 2164400100037 life of 0.2 sec was made by empirical correlation 2164400100038 betwwen the yields and values of z and a of each 2164400100039 fissioning nucleus. 2164400100040 ERR-ANALYS (DATA-ERR) Errors are quoted as one standard 2164400100041 deviation, and are a combination of errors on neutron 2164400100042 intensities and those on fission rates in samples. 2164400100043 STATUS (TABLE) Table on page 34., INDC(NDS)-113. 2164400100044 (APRVD) approved by author 1980/10. 2164400100045 HISTORY (19800827C) 2164400100046 (19800117A) spectrum corrected. 2164400100047 (20220209A) SD:Updated to new date formats,lower case. 2164400100048 Corrections in all Subents. Subents 008-013 added. 2164400100049 MONIT-REF added. 2164400100050 ENDBIB 48 0 2164400100051 COMMON 1 3 2164400100052 EN-DUMMY 2164400100053 MEV 2164400100054 1.5 2164400100055 ENDCOMMON 3 0 2164400100056 ENDSUBENT 55 0 2164400199999 SUBENT 21644002 20220209 23092164400200001 BIB 5 9 2164400200002 REACTION (92-U-233(N,F),DL,NU,,SPA) 2164400200003 SAMPLE Uranium oxide, 3.35 mg, enriched in U-233, no known 2164400200004 impurities. 2164400200005 MONITOR (92-U-233(N,F)57-LA-140,CUM,FY,,SPA) 2164400200006 STATUS (TABLE) Tbl.II from Nucl.Sci.Eng.,80(1982)379 2164400200007 (DEP,21644008) Delayed neutron yields per group 2164400200008 HISTORY (19800117A) spectrum code corrected. 2164400200009 (20220209A) SD: Error value updated according to the 2164400200010 final publ. STATUS updated. 2164400200011 ENDBIB 9 0 2164400200012 NOCOMMON 0 0 2164400200013 DATA 2 1 2164400200014 DATA DATA-ERR 2164400200015 PC/FIS PC/FIS 2164400200016 7.79E-03 0.43E-03 2164400200017 ENDDATA 3 0 2164400200018 ENDSUBENT 17 0 2164400299999 SUBENT 21644003 20220209 23092164400300001 BIB 5 8 2164400300002 REACTION (93-NP-237(N,F),DL,NU,,SPA) 2164400300003 SAMPLE Neptunium oxide, 30.2 mg, enriched in Np-237. 2164400300004 MONITOR (93-NP-237(N,F)57-LA-140,CUM,FY,,SPA) 2164400300005 STATUS (TABLE) Tbl.III from Nucl.Sci.Eng.,80(1982)379 2164400300006 (DEP,21644009) Delayed neutron yields per group 2164400300007 HISTORY (19801017A) spectrum code corrected. 2164400300008 (20220209A) SD: Error value updated according to the 2164400300009 final publ. STATUS updated. 2164400300010 ENDBIB 8 0 2164400300011 NOCOMMON 0 0 2164400300012 DATA 2 1 2164400300013 DATA DATA-ERR 2164400300014 PC/FIS PC/FIS 2164400300015 1.22E-02 0.03E-02 2164400300016 ENDDATA 3 0 2164400300017 ENDSUBENT 16 0 2164400399999 SUBENT 21644004 20220209 23092164400400001 BIB 5 10 2164400400002 REACTION (94-PU-238(N,F),DL,NU,,SPA) 2164400400003 SAMPLE Plutonium oxide, 2.82 mg, enriched in Pu-238, with 2164400400004 impurities of U-234(5%), Np-237(1.2%), Pu-239 2164400400005 (0.7%), Pu-240(1.0%). 2164400400006 MONITOR (94-PU-238(N,F)57-LA-140,CUM,FY,,SPA) 2164400400007 STATUS (TABLE) Tbl.IV from Nucl.Sci.Eng.,80(1982)379 2164400400008 (DEP,21644010) Delayed neutron yields per group 2164400400009 HISTORY (19801017A) spectrum code corrected. 2164400400010 (20220209A) SD: Error value updated according to the 2164400400011 final publ. STATUS updated. 2164400400012 ENDBIB 10 0 2164400400013 NOCOMMON 0 0 2164400400014 DATA 2 1 2164400400015 DATA DATA-ERR 2164400400016 PC/FIS PC/FIS 2164400400017 4.06E-03 0.20E-03 2164400400018 ENDDATA 3 0 2164400400019 ENDSUBENT 18 0 2164400499999 SUBENT 21644005 20220209 23092164400500001 BIB 5 9 2164400500002 REACTION (94-PU-240(N,F),DL,NU,,SPA) 2164400500003 SAMPLE Plutonium oxide, 4.6 mg, enriched in Pu-240, with 2164400500004 impurities of Pu-239(1.0%), Pu-241(0.5%), Pu-242(0.7%)2164400500005 MONITOR (94-PU-240(N,F)57-LA-140,CUM,FY,,SPA) 2164400500006 STATUS (TABLE) Tbl.V from Nucl.Sci.Eng.,80(1982)379 2164400500007 (DEP,21644011) Delayed neutron yields per group 2164400500008 HISTORY (19801017A) spectrum code corrected. 2164400500009 (20220209A) SD: Values updated according to the 2164400500010 final publ. STATUS updated. 2164400500011 ENDBIB 9 0 2164400500012 NOCOMMON 0 0 2164400500013 DATA 2 1 2164400500014 DATA DATA-ERR 2164400500015 PC/FIS PC/FIS 2164400500016 9.11E-03 0.41E-03 2164400500017 ENDDATA 3 0 2164400500018 ENDSUBENT 17 0 2164400599999 SUBENT 21644006 20220209 23092164400600001 BIB 5 10 2164400600002 REACTION (94-PU-241(N,F),DL,NU,,SPA) 2164400600003 SAMPLE Plutonium oxide, 1.54 mg, enriched in Pu-241, with 2164400600004 impurities of Np-237(0.2%), Pu-239(0.1%), 2164400600005 Pu-240(0.2%), and Am-241(21.%). 2164400600006 MONITOR (94-PU-241(N,F)57-LA-140,CUM,FY,,SPA) 2164400600007 STATUS (TABLE) Tbl.VI from Nucl.Sci.Eng.,80(1982)379 2164400600008 (DEP,21644012) Delayed neutron yields per group 2164400600009 HISTORY (19801017A) spectrum code corrected. 2164400600010 (20220209A) SD: Values updated according to the 2164400600011 final publ. STATUS updated. 2164400600012 ENDBIB 10 0 2164400600013 NOCOMMON 0 0 2164400600014 DATA 2 1 2164400600015 DATA DATA-ERR 2164400600016 PC/FIS PC/FIS 2164400600017 1.60E-02 0.09E-02 2164400600018 ENDDATA 3 0 2164400600019 ENDSUBENT 18 0 2164400699999 SUBENT 21644007 20220209 23092164400700001 BIB 5 9 2164400700002 REACTION (95-AM-241(N,F),DL,NU,,SPA) 2164400700003 SAMPLE Plutonium oxide, 5.36 mg, enriched in Am-241, with 2164400700004 impurities of Np-237(2.%), and Pu-239(0.8%). 2164400700005 MONITOR (95-AM-241(N,F)57-LA-140,CUM,FY,,SPA) 2164400700006 STATUS (TABLE) Tbl.VII from Nucl.Sci.Eng.,80(1982)379 2164400700007 (DEP,21644013) Delayed neutron yields per group 2164400700008 HISTORY (19801017A) spectrum code corrected. 2164400700009 (20220209A) SD: Values updated according to the 2164400700010 final publ. STATUS updated. 2164400700011 ENDBIB 9 0 2164400700012 NOCOMMON 0 0 2164400700013 DATA 2 1 2164400700014 DATA DATA-ERR 2164400700015 PC/FIS PC/FIS 2164400700016 3.94E-03 0.24E-03 2164400700017 ENDDATA 3 0 2164400700018 ENDSUBENT 17 0 2164400799999 SUBENT 21644008 20220209 23092164400800001 BIB 5 7 2164400800002 REACTION (92-U-233(N,F),DL/GRP,NU,,SPA) 2164400800003 SAMPLE Uranium oxide, 3.35 mg, enriched in U-233, no known 2164400800004 impurities. 2164400800005 MONITOR (92-U-233(N,F)57-LA-140,CUM,FY,,SPA) 2164400800006 STATUS (TABLE) Tbl.II from Nucl.Sci.Eng.,80(1982)379 2164400800007 (COREL,21644002) Total neutron yields 2164400800008 HISTORY (20220209C) SD 2164400800009 ENDBIB 7 0 2164400800010 NOCOMMON 0 0 2164400800011 DATA 3 6 2164400800012 GRP-NUM DATA DATA-ERR 2164400800013 NO-DIM PC/FIS PC/FIS 2164400800014 1. 7.10E-04 0.50E-04 2164400800015 2. 2.18E-03 0.21E-03 2164400800016 3. 1.84E-03 0.11E-03 2164400800017 4. 2.08E-03 0.12E-03 2164400800018 5. 8.12E-04 2.61E-04 2164400800019 6. 1.7E-04 0.4E-04 2164400800020 ENDDATA 8 0 2164400800021 ENDSUBENT 20 0 2164400899999 SUBENT 21644009 20220209 23092164400900001 BIB 5 6 2164400900002 REACTION (93-NP-237(N,F),DL/GRP,NU,,SPA) 2164400900003 SAMPLE Neptunium oxide, 30.2 mg, enriched in Np-237. 2164400900004 MONITOR (93-NP-237(N,F)57-LA-140,CUM,FY,,SPA) 2164400900005 STATUS (TABLE) Tbl.III from Nucl.Sci.Eng.,80(1982)379 2164400900006 (COREL,21644003) Total neutron yields 2164400900007 HISTORY (20220209C) SD 2164400900008 ENDBIB 6 0 2164400900009 NOCOMMON 0 0 2164400900010 DATA 3 6 2164400900011 GRP-NUM DATA DATA-ERR 2164400900012 NO-DIM PC/FIS PC/FIS 2164400900013 1. 4.90E-04 0.31E-04 2164400900014 2. 3.10E-03 0.09E-03 2164400900015 3. 2.51E-03 0.09E-03 2164400900016 4. 4.54E-03 0.14E-03 2164400900017 5. 1.29E-04 0.12E-04 2164400900018 6. 2.7E-04 0.7E-04 2164400900019 ENDDATA 8 0 2164400900020 ENDSUBENT 19 0 2164400999999 SUBENT 21644010 20220209 23092164401000001 BIB 5 8 2164401000002 REACTION (94-PU-238(N,F),DL/GRP,NU,,SPA) 2164401000003 SAMPLE Plutonium oxide, 2.82 mg, enriched in Pu-238, with 2164401000004 impurities of U-234(5%), Np-237(1.2%), Pu-239 2164401000005 (0.7%), Pu-240(1.0%). 2164401000006 MONITOR (94-PU-238(N,F)57-LA-140,CUM,FY,,SPA) 2164401000007 STATUS (TABLE) Tbl.IV from Nucl.Sci.Eng.,80(1982)379 2164401000008 (COREL,21644004) Total neutron yields 2164401000009 HISTORY (20220209C) SD 2164401000010 ENDBIB 8 0 2164401000011 NOCOMMON 0 0 2164401000012 DATA 3 5 2164401000013 GRP-NUM DATA DATA-ERR 2164401000014 NO-DIM PC/FIS PC/FIS 2164401000015 1. 2.68E-04 0.29E-04 2164401000016 2. 1.11E-03 0.07E-03 2164401000017 3. 1.19E-03 0.08E-03 2164401000018 4. 1.13E-03 0.12E-03 2164401000019 5. 2.74E-04 0.91E-04 2164401000020 ENDDATA 7 0 2164401000021 ENDSUBENT 20 0 2164401099999 SUBENT 21644011 20220209 23092164401100001 BIB 5 7 2164401100002 REACTION (94-PU-240(N,F),DL/GRP,NU,,SPA) 2164401100003 SAMPLE Plutonium oxide, 4.6 mg, enriched in Pu-240, with 2164401100004 impurities of Pu-239(1.0%), Pu-241(0.5%), Pu-242(0.7%)2164401100005 MONITOR (94-PU-240(N,F)57-LA-140,CUM,FY,,SPA) 2164401100006 STATUS (TABLE) Tbl.V from Nucl.Sci.Eng.,80(1982)379 2164401100007 (COREL,21644005) Total neutron yields 2164401100008 HISTORY (20220209C) SD 2164401100009 ENDBIB 7 0 2164401100010 NOCOMMON 0 0 2164401100011 DATA 3 5 2164401100012 GRP-NUM DATA DATA-ERR 2164401100013 NO-DIM PC/FIS PC/FIS 2164401100014 1. 2.65E-04 0.25E-04 2164401100015 2. 2.63E-03 0.11E-03 2164401100016 3. 1.26E-03 0.08E-03 2164401100017 4. 3.21E-03 0.14E-03 2164401100018 5. 1.49E-03 0.23E-03 2164401100019 ENDDATA 7 0 2164401100020 ENDSUBENT 19 0 2164401199999 SUBENT 21644012 20220209 23092164401200001 BIB 5 8 2164401200002 REACTION (94-PU-241(N,F),DL/GRP,NU,,SPA) 2164401200003 SAMPLE Plutonium oxide, 1.54 mg, enriched in Pu-241, with 2164401200004 impurities of Np-237(0.2%), Pu-239(0.1%), 2164401200005 Pu-240(0.2%), and Am-241(21.%). 2164401200006 MONITOR (94-PU-241(N,F)57-LA-140,CUM,FY,,SPA) 2164401200007 STATUS (TABLE) Tbl.VI from Nucl.Sci.Eng.,80(1982)379 2164401200008 (COREL,21644006) Total neutron yields 2164401200009 HISTORY (20220209C) SD 2164401200010 ENDBIB 8 0 2164401200011 NOCOMMON 0 0 2164401200012 DATA 3 5 2164401200013 GRP-NUM DATA DATA-ERR 2164401200014 NO-DIM PC/FIS PC/FIS 2164401200015 1. 2.76E-04 0.12E-04 2164401200016 2. 3.70E-03 0.11E-03 2164401200017 3. 2.98E-03 0.36E-03 2164401200018 4. 5.89E-03 0.51E-03 2164401200019 5. 2.76E-04 0.55E-04 2164401200020 ENDDATA 7 0 2164401200021 ENDSUBENT 20 0 2164401299999 SUBENT 21644013 20220209 23092164401300001 BIB 5 7 2164401300002 REACTION (95-AM-241(N,F),DL/GRP,NU,,SPA) 2164401300003 SAMPLE Plutonium oxide, 5.36 mg, enriched in Am-241, with 2164401300004 impurities of Np-237(2.%), and Pu-239(0.8%). 2164401300005 MONITOR (95-AM-241(N,F)57-LA-140,CUM,FY,,SPA) 2164401300006 STATUS (TABLE) Tbl.VII from Nucl.Sci.Eng.,80(1982)379 2164401300007 (COREL,21644007) Total neutron yields 2164401300008 HISTORY (20220209C) SD 2164401300009 ENDBIB 7 0 2164401300010 NOCOMMON 0 0 2164401300011 DATA 3 5 2164401300012 GRP-NUM DATA DATA-ERR 2164401300013 NO-DIM PC/FIS PC/FIS 2164401300014 1. 1.92E-04 0.21E-04 2164401300015 2. 1.16E-03 0.09E-03 2164401300016 3. 6.55E-04 1.37E-04 2164401300017 4. 1.35E-03 0.09E-03 2164401300018 5. 4.93E-04 0.98E-04 2164401300019 ENDDATA 7 0 2164401300020 ENDSUBENT 19 0 2164401399999 ENDENTRY 13 0 2164499999999