ENTRY 40757 20231113 4075700000001 SUBENT 40757001 20231113 20240513 4075700100001 BIB 8 51 4075700100002 TITLE Measurements of the average number of neutrons emitted 4075700100003 in the fission of some uranium and plutonium isotopes. 4075700100004 COMMENT This article contains three parts: 4075700100005 Part I. Page 123. 4075700100006 Relative measurements of the average number of 4075700100007 neutrons emitted in the thermal fission of U233, U235, 4075700100008 Pu239, and Pu241. 4075700100009 V.I.Kalashnikova,V.I.Lebedev,L.A.Mikaelyan, 4075700100010 P.E.Spivak,V.P.Zakharova 4075700100011 Part II. Page 127. 4075700100012 Dependence of the number of neutrons emitted 4075700100013 in the fission of heavy nuclei on the excitation 4075700100014 energy of the fissionable nucleus. 4075700100015 V.I.Kalashnikova, A.V.Krasnushkin, V.I.Lebedev, 4075700100016 M.I.Pevzner, V.P.Zakharova 4075700100017 Part III. Page 131. 4075700100018 Absolute evaluation of the average number of 4075700100019 neutrons emitted in the fission of some isotopes of 4075700100020 uranium and plutonium. 4075700100021 V.I.Kalashnikova,V.I.Lebedev,P.E.Spivak,V.P.Zakharova. 4075700100022 In "V.I.Kalashnikov" (in part III) there is a misprint,4075700100023 right "V.I.Kalashnikova", see Parts I, II on pages 4075700100024 123, 127 of AEC-TR-2435,vol.1. 4075700100025 .Of compiler M.M. 4075700100026 This article was presented at 55MOSCOW ( candidates to4075700100027 55GENEVA were discussed), 4075700100028 and as mentioned in R,UCRL-50400,v.2,rev.2,1976, 4075700100029 at 55GENEVA it was reported by M.S.Kozodaev at 4075700100030 discussion of P/592 - see 55GENEVA,vol.2, 4075700100031 p.228(English), p.258(Russian edition). 4075700100032 In "V.I.Kalashnikov" there is probably a misprint, 4075700100033 right "V.I.Kalashnikova", see Parts I, II on pages 4075700100034 123, 127 of AEC-TR-2435,vol.1. 4075700100035 AUTHOR (V.I.Kalashnikova,V.I.Lebedev,L.A.Mikaelyan, 4075700100036 P.E.Spivak,V.P.Zakharova, A.V.Krasnukhin, M.I.Pevzner) 4075700100037 REFERENCE (S,AEC-TR-2435,(1),131,1956) Part III. 4075700100038 (S,AEC-TR-2435,(1),127,1956) Part II. 4075700100039 (C,55MOSCOW,1,156,1955) 4075700100040 REL-REF (N,,M.S.Kozodaev,C,55GENEVA,2,258,1955) 4075700100041 Comments of M.S.Kozodaev at discussion of P/502. 4075700100042 Data were confirmed (Subents 002-004). 4075700100043 INSTITUTE (4RUSKUR) 4075700100044 DETECTOR (PROPC) Neutrons detected by 24 BF3 counters in 4075700100045 paraffin. 4075700100046 (IOCH) 4075700100047 HISTORY (19840522T) Converted from ENTRY 80157 4075700100048 (20231113A) Upper -> lower case correction. 4075700100049 Dates were corrected for 4-digits year. 4075700100050 DEP code was added in STATUS of data Subents. 4075700100051 Units were corrected: NO-DIM -> PRT/FIS 4075700100052 Subents 005-007 were added. 4075700100053 ENDBIB 51 0 4075700100054 NOCOMMON 0 0 4075700100055 ENDSUBENT 54 0 4075700199999 SUBENT 40757002 20231113 20240513 4075700200001 BIB 7 25 4075700200002 REACTION (94-PU-239(N,F),PR,NU,,MXW) 4075700200003 INC-SOURCE .Calibrated neutron source 4075700200004 .Thermal neutron beam 4075700200005 INC-SPECT .Fission neutron spectrum 4075700200006 .Thermal spectrum 4075700200007 MONITOR (92-U-235(N,F),PR,NU,,MXW) 4075700200008 COMMENT .Of N.Otsuka (NDS,IAEA). 4075700200009 It's not clear, why the authors used U-235 fission NU 4075700200010 as monitor (given in DATA block) but not U-233 fission 4075700200011 NU measured by the authors (given in Subent 007). 4075700200012 ERR-ANALYS (DATA-ERR) Error mainly resulting from neutron source 4075700200013 strength inaccuracy (+-3.%). 4075700200014 STATUS (TABLE,,V.I.Kalashnikov+,S,AEC-TR-2435,(1),131,1956) 4075700200015 Table 6 on page 131 4075700200016 See also text of M.S.Kozodaev,C,55GENEVA,2,258,1955 - 4075700200017 data were confirmed. 4075700200018 (DEP,40756002) Ratio Pu-239/U-235 at thermal energy. 4075700200019 (OUTDT) It's not clear, 4075700200020 - what was monitor: 4075700200021 1)U-235 NU as mentioned in AEC-TR-2435,(1),131,1956 or 4075700200022 2) U-233 NU as in M.S.Kozodaev,C,55GENEVA,2,258,1955 4075700200023 - what was incident neutron energy: 4075700200024 1) thermal (used in DATA block as EN-DUMMY because 4075700200025 U233/U235 was measured at thermal energy) or 4075700200026 2) fission spectrum energy. 4075700200027 ENDBIB 25 0 4075700200028 NOCOMMON 0 0 4075700200029 DATA 4 1 4075700200030 EN-DUMMY DATA DATA-ERR MONIT 4075700200031 MEV PRT/FIS PER-CENT PRT/FIS 4075700200032 2.5300E-08 3.0 4. 2.5 4075700200033 ENDDATA 3 0 4075700200034 ENDSUBENT 33 0 4075700299999 SUBENT 40757003 20231113 20240513 4075700300001 BIB 7 26 4075700300002 REACTION (94-PU-241(N,F),PR,NU,,MXW) 4075700300003 INC-SOURCE .Calibrated neutron source 4075700300004 .Thermal neutron beam 4075700300005 INC-SPECT .Fission neutron spectrum 4075700300006 .Thermal spectrum 4075700300007 MONITOR (92-U-235(N,F),PR,NU,,MXW) 4075700300008 COMMENT .Of N.Otsuka (NDS,IAEA). 4075700300009 It's not clear, why the authors used U-235 fission NU 4075700300010 as monitor (given in DATA block) but not U-233 fission 4075700300011 NU measured by the authors (given in Subent 007). 4075700300012 ERR-ANALYS (DATA-ERR) Error mainly resulting from neutron source 4075700300013 strength inaccuracy (+-3.%). 4075700300014 STATUS (TABLE,,V.I.Kalashnikov+,S,AEC-TR-2435,(1),131,1956) 4075700300015 Table 6 on page 131 4075700300016 See also text of M.S.Kozodaev,C,55GENEVA,2,258,1955 - 4075700300017 data were confirmed. 4075700300018 (DEP,40756003) Ratio Pu241/Pu239 at thermal energy 4075700300019 (DEP,40756002) Ratio Pu239/U235 at thermal energy 4075700300020 (OUTDT) It's not clear, 4075700300021 - what was monitor: 4075700300022 1)U-235 NU as mentioned in AEC-TR-2435,(1),131,1956 or 4075700300023 2)U-233 NU as in M.S.Kozodaev,C,55GENEVA,2,258,1955 4075700300024 - what was incident neutron energy: 4075700300025 1) thermal (used in DATA block as EN-DUMMY because 4075700300026 U233/U235 was measured at thermal energy) or 4075700300027 2) fission spectrum energy. 4075700300028 ENDBIB 26 0 4075700300029 NOCOMMON 0 0 4075700300030 DATA 4 1 4075700300031 EN-DUMMY DATA DATA-ERR MONIT 4075700300032 MEV PRT/FIS PER-CENT PRT/FIS 4075700300033 2.5300E-08 3.1 4. 2.5 4075700300034 ENDDATA 3 0 4075700300035 ENDSUBENT 34 0 4075700399999 SUBENT 40757004 20231113 20240513 4075700400001 BIB 7 27 4075700400002 REACTION (92-U-233(N,F),PR,NU,,MXW) 4075700400003 INC-SOURCE .Thermal neutron beam 4075700400004 INC-SPECT .Thermal spectrum 4075700400005 MONITOR (92-U-235(N,F),PR,NU,,MXW) 4075700400006 COMMENT .Of N.Otsuka (NDS,IAEA). 4075700400007 It's not clear, why the authors used U-235 fission NU 4075700400008 as monitor (given in DATA block) but not U-233 fission 4075700400009 NU measured by the authors (given in Subent 007). 4075700400010 ERR-ANALYS (DATA-ERR) Error mainly resulting from neutron source 4075700400011 strength inaccuracy (+-3.%). 4075700400012 STATUS (TABLE,,V.I.Kalashnikov+,S,AEC-TR-2435,(1),131,1956) 4075700400013 Text on page 131 (with uncertainty), 4075700400014 Table 6 (without uncertainty) 4075700400015 See also text of M.S.Kozodaev,C,55GENEVA,2,258,1955 - 4075700400016 data were confirmed. 4075700400017 (DEP,40756004) Ratio U-233/U-235 at thermal energy 4075700400018 (COREL,40757007) U-233 Nu determined by calibrated 4075700400019 source. 4075700400020 (OUTDT) It's not clear, 4075700400021 - what was monitor: 4075700400022 1)U-235 NU as mentioned in AEC-TR-2435,(1),131,1956 or 4075700400023 2)U-233 NU in M.S.Kozodaev,C,55GENEVA,2,258,1955 is 4075700400024 mentioned once as determined by calibrated source; 4075700400025 - what was incident neutron energy: 4075700400026 1) thermal (used in DATA block as EN-DUMMY because 4075700400027 U233/U235 was measured at thermal energy) or 4075700400028 2) fission spectrum energy. 4075700400029 ENDBIB 27 0 4075700400030 NOCOMMON 0 0 4075700400031 DATA 4 1 4075700400032 EN-DUMMY DATA DATA-ERR MONIT 4075700400033 MEV PRT/FIS PER-CENT PRT/FIS 4075700400034 2.5300E-08 2.6 4. 2.5 4075700400035 ENDDATA 3 0 4075700400036 ENDSUBENT 35 0 4075700499999 SUBENT 40757005 20231113 20240513 4075700500001 BIB 7 21 4075700500002 REACTION (94-PU-239(N,F),PR,NU,,MXW)/(94-PU-240(0,F),PR,NU) 4075700500003 INC-SOURCE .Thermal neutron beam 4075700500004 INC-SPECT .Thermal spectrum 4075700500005 SAMPLE Thin layer (0.2 mg/cm2) of mixture of Pu-240 and 4075700500006 Pu-239 in approximately equal proportions. 4075700500007 Total weight of Pu 1.7 mg. 4075700500008 METHOD (COINC) Fission fragmants and neutrons coincidence. 4075700500009 Two series of measurement: 4075700500010 Ser. Isotope Nfragments Ncoincidences NU*w*eta 4075700500011 I Pu239 33,826 4,375 0.128+-0.002 4075700500012 Pu240 19,467 1,897 0.097+-0.002 4075700500013 II Pu239 483,712 61,432 0.1270+-0.00074075700500014 Pu240 21,232 2,003 0.094+-0.002 4075700500015 Where 4075700500016 w - solid angle, 4075700500017 eta - detection efficiency. 4075700500018 ERR-ANALYS (ERR-S) Statistical error. 4075700500019 Systematic error is sufficiently small - comment of 4075700500020 authors in the article. 4075700500021 STATUS (TABLE,,V.I.Kalashnikova+,S,AEC-TR-2435,(1),127,1956) 4075700500022 Text on page 129 4075700500023 ENDBIB 21 0 4075700500024 NOCOMMON 0 0 4075700500025 DATA 3 1 4075700500026 EN-DUMMY DATA ERR-S 4075700500027 EV NO-DIM NO-DIM 4075700500028 0.0253 1.33 0.03 4075700500029 ENDDATA 3 0 4075700500030 ENDSUBENT 29 0 4075700599999 SUBENT 40757006 20231113 20240513 4075700600001 BIB 3 7 4075700600002 REACTION (94-PU-240(0,F),PR,NU) 4075700600003 ERR-ANALYS (DATA-ERR) Error mainly resulting from neutron source 4075700600004 strength inaccuracy (+-3.%). 4075700600005 STATUS (TABLE,,V.I.Kalashnikov+,S,AEC-TR-2435,(1),131,1956) 4075700600006 Table 6. 4075700600007 (DEP,40756005) Ratio Pu239(n,f)/Pu240(spont.fis.) 4075700600008 (DEP,40757002) Pu239 4075700600009 ENDBIB 7 0 4075700600010 NOCOMMON 0 0 4075700600011 DATA 3 1 4075700600012 DATA DATA-ERR MONIT 4075700600013 PRT/FIS PER-CENT PRT/FIS 4075700600014 2.2 4. 2.5 4075700600015 ENDDATA 3 0 4075700600016 ENDSUBENT 15 0 4075700699999 SUBENT 40757007 20231113 20240513 4075700700001 BIB 8 27 4075700700002 REACTION (92-U-233(N,F),PR,NU,,FIS) 4075700700003 INC-SPECT .Calibrated source spectrum was very similar to the 4075700700004 fission spectrum. 4075700700005 METHOD . The quantity w*eta was measured with the calibrated 4075700700006 source and was found to be (5.35+-0.15) %. 4075700700007 .Dependence of quantity NU*w*eta on resolving time t : 4075700700008 t,sec NU*w*eta 4075700700009 1.6E-04 0.0117 4075700700010 2.8E-04 0.134 4075700700011 3.4E-04 0.136 4075700700012 4.3E-04 0.140 4075700700013 5.0E-04 0.140 4075700700014 w - solid angle, 4075700700015 eta - neutron detection efficiency. 4075700700016 ANALYSIS NU was determined from measured (with calibrated 4075700700017 source) w*eta and measured NU*w*eta = 0.140+-0.001. 4075700700018 COMMENT .Of compiler M.M. 4075700700019 From the text of the Part III article it is not enouth4075700700020 clear, what incident spectrum was at measuremet of 4075700700021 NU*w*eta - calibrated source spectrum or 4075700700022 thermal spectrum. 4075700700023 ERR-ANALYS (DATA-ERR) Type of uncertainty is not explained in the 4075700700024 article. 4075700700025 STATUS (TABLE,,V.I.Kalashnikov+,S,AEC-TR-2435,(1),131,1956) 4075700700026 Text on page 131. 4075700700027 HISTORY (20231113C) Subent was added according to a comment of 4075700700028 N.Otsuka (NDS,IAEA). 4075700700029 ENDBIB 27 0 4075700700030 NOCOMMON 0 0 4075700700031 DATA 3 1 4075700700032 EN-DUMMY DATA DATA-ERR 4075700700033 MEV PRT/FIS PRT/FIS 4075700700034 1. 2.6 0.1 4075700700035 ENDDATA 3 0 4075700700036 ENDSUBENT 35 0 4075700799999 ENDENTRY 7 0 4075799999999