ENTRY 40756 20231113 421640756 0 1 SUBENT 40756001 20231113 421640756 1 1 BIB 11 51 40756 1 2 TITLE Measurements of the average number of neutrons emitted 40756 1 3 in the fission of some uranium and plutonium isotopes. 40756 1 4 COMMENT This article contains three parts: 40756 1 5 Part I. Page 123. 40756 1 6 Relative measurements of the average number of 40756 1 7 neutrons emitted in the thermal fission of U233, U235, 40756 1 8 Pu239, and Pu241. 40756 1 9 V.I.Kalashnikova,V.I.Lebedev,L.A.Mikaelyan, 40756 1 10 P.E.Spivak,V.P.Zakharova 40756 1 11 Part II. Page 127. 40756 1 12 Dependence of the number of neutrons emitted 40756 1 13 in the fission of heavy nuclei on the excitation 40756 1 14 energy of the fissionable nucleus. 40756 1 15 V.I.Kalashnikova, A.V.Krasnushkin, V.I.Lebedev, 40756 1 16 M.I.Pevzner, V.P.Zakharova 40756 1 17 Part III. Page 131. 40756 1 18 Absolute evaluation of the average number of 40756 1 19 neutrons emitted in the fission of some isotopes of 40756 1 20 uranium and plutonium. 40756 1 21 V.I.Kalashnikova,V.I.Lebedev,P.E.Spivak,V.P.Zakharova. 40756 1 22 In "V.I.Kalashnikov" (in part III) there is a misprint,40756 1 23 right "V.I.Kalashnikova", see Parts I, II on pages 40756 1 24 123, 127 of AEC-TR-2435,vol.1. 40756 1 25 .Of compiler M.M. 40756 1 26 This article was presented at 55MOSCOW ( candidates to40756 1 27 55GENEVA were discussed), 40756 1 28 and as mentioned in R,UCRL-50400,v.2,rev.2,1976, 40756 1 29 at 55GENEVA it was reported by M.S.Kozodaev at 40756 1 30 discussion of P/592 - see 55GENEVA,vol.2, 40756 1 31 p.228(English), p.258(Russian edition). 40756 1 32 AUTHOR (V.I.Kalashnikova,V.I.Lebedev,L.A.Mikaelyan, 40756 1 33 P.E.Spivak,V.P.Zakharova, A.V.Krasnukhin, M.I.Pevzner) 40756 1 34 REFERENCE (S,AEC-TR-2435,(1),123,1956) 40756 1 35 Engl.translation of 55MOSCOW,1,156,1955. 40756 1 36 (C,55MOSCOW,1,156,1955) 40756 1 37 REL-REF (N,,M.S.Kozodaev,C,55GENEVA,2,258,1955) 40756 1 38 Comments of M.S.Kozodaev at discussion of P/502. 40756 1 39 Data were confirmed. 40756 1 40 INSTITUTE (4RUSKUR) 40756 1 41 INC-SPECT Thermal spectrum 40756 1 42 DETECTOR (PROPC) Neutrons detected by 10 BF3 counters in 40756 1 43 paraffin. 40756 1 44 (IOCH) 40756 1 45 METHOD Measurements with and without Cd of 0.6 mm thickness. 40756 1 46 ERR-ANALYS (DATA-ERR) Includes statistical error and systematic 40756 1 47 errors due to corrections. 40756 1 48 HISTORY (19840522T) Converted from ENTRY 80153 40756 1 49 (20231113A) Ref. AEC-TR-2435,(1),123,1956 was added. 40756 1 50 BIB information was updated. 40756 1 51 Upper -> lower case correction. 40756 1 52 Dates were corrected for 4-digits year. 40756 1 53 ENDBIB 51 0 40756 1 54 NOCOMMON 0 0 40756 1 55 ENDSUBENT 54 0 40756 199999 SUBENT 40756002 20231113 421640756 2 1 BIB 4 16 40756 2 2 REACTION ((94-PU-239(N,F),,NU,,MXW)/ 40756 2 3 (92-U-235(N,F),,NU,,MXW)) 40756 2 4 METHOD Several series of measurements, summary: 40756 2 5 Isotope Nfragments Nneutrons alpha*NU(+-statistical)40756 2 6 U235 1970560 235584 0.1196+-0.0006 40756 2 7 Pu239 1452800 206272 0.1420+-0.0009 40756 2 8 Where 40756 2 9 alpha = (w*eta)/k, 40756 2 10 w - solid angle, 40756 2 11 eta - neutron detection efficiency, 40756 2 12 k - chamber efficiency. 40756 2 13 STATUS (TABLE,,V.I.Kalashnikova+,S,AEC-TR-2435,(1),123,1956) 40756 2 14 Table 3 on page 126. 40756 2 15 See also text of M.S.Kozodaev,C,55GENEVA,2,258,1955 - 40756 2 16 data were confirmed. 40756 2 17 HISTORY (19840522T) Converted from SUBENTRY 80153002 40756 2 18 ENDBIB 16 0 40756 2 19 NOCOMMON 0 0 40756 2 20 DATA 3 1 40756 2 21 EN-DUMMY DATA DATA-ERR 40756 2 22 EV NO-DIM NO-DIM 40756 2 23 0.0253 1.19 0.01 40756 2 24 ENDDATA 3 0 40756 2 25 ENDSUBENT 24 0 40756 299999 SUBENT 40756003 20231113 421640756 3 1 BIB 6 24 40756 3 2 REACTION ((94-PU-241(N,F),PR,NU,,MXW)/ 40756 3 3 (94-PU-239(N,F),PR,NU,,MXW)) 40756 3 4 SAMPLE 1) 0.92 Pu241 + 0.08 Pu239 and 2) Pu239. 40756 3 5 METHOD (COINC) Coincidences between fragments and fission 40756 3 6 neutrons. 40756 3 7 Two series of measurements with somewhat different 40756 3 8 values of eta: 40756 3 9 Series Sample Nfragments Ncoincidences NU*w*eta 40756 3 10 I 1) 521.024 68.124 0.1308+-0.0006 40756 3 11 2) 359.520 32.576 0.1255+-0.0009 40756 3 12 II 1) 117.568 15.888 0.1351+-0.0013 40756 3 13 2) 320.960 41.688 0.1299+-0.0008 40756 3 14 Where 40756 3 15 w - solid angle, 40756 3 16 eta - detection efficiency. 40756 3 17 COMMENT Of authors. In coincidence method the delayed neutrons 40756 3 18 were naturally excluded from the count. 40756 3 19 STATUS (TABLE,,V.I.Kalashnikova+,S,AEC-TR-2435,(1),123,1956) 40756 3 20 Table 3 on page 126. 40756 3 21 See also text of M.S.Kozodaev,C,55GENEVA,2,258,1955 - 40756 3 22 data were confirmed. 40756 3 23 HISTORY (19840522T) Converted from SUBENTRY 80153003 40756 3 24 (20231113A) U-235 -> Pu-239 as given in Table 3. 40756 3 25 PR code was added in reaction - see comment of authors.40756 3 26 ENDBIB 24 0 40756 3 27 NOCOMMON 0 0 40756 3 28 DATA 3 1 40756 3 29 EN-DUMMY DATA DATA-ERR 40756 3 30 EV NO-DIM NO-DIM 40756 3 31 0.0253 1.04 0.01 40756 3 32 ENDDATA 3 0 40756 3 33 ENDSUBENT 32 0 40756 399999 SUBENT 40756004 20231113 421640756 4 1 BIB 4 16 40756 4 2 REACTION ((92-U-233(N,F),PR,NU,,MXW)/ 40756 4 3 (92-U-235(N,F),PR,NU,,MXW)) 40756 4 4 METHOD Several series of measurements, summary: 40756 4 5 Isotope Nfragments Nneutrons alpha*NU(+-statistical)40756 4 6 U233 1261184 256008 0.1237+-0.0006 40756 4 7 U235 1970560 235584 0.1196+-0.0006 40756 4 8 Where 40756 4 9 alpha = (w*eta)/k, 40756 4 10 w - solid angle, 40756 4 11 eta - neutron detection efficiency. 40756 4 12 k - chamber efficiency, 40756 4 13 STATUS (TABLE,,V.I.Kalashnikova+,S,AEC-TR-2435,(1),123,1956) 40756 4 14 Table 3 on page 126. 40756 4 15 See also text of M.S.Kozodaev,C,55GENEVA,2,258,1955 - 40756 4 16 data were confirmed. 40756 4 17 HISTORY (19840522T) Converted from SUBENTRY 80153004 40756 4 18 ENDBIB 16 0 40756 4 19 NOCOMMON 0 0 40756 4 20 DATA 3 1 40756 4 21 EN-DUMMY DATA DATA-ERR 40756 4 22 EV NO-DIM NO-DIM 40756 4 23 0.0253 1.03 0.01 40756 4 24 ENDDATA 3 0 40756 4 25 ENDSUBENT 24 0 40756 499999 ENDENTRY 4 0 4075699999999