ENTRY 40148 20151123 41724014800000001 SUBENT 40148001 20151123 41724014800100001 BIB 12 26 4014800100002 INSTITUTE (4RUSFEI) 4014800100003 REFERENCE (J,AE,33,(5),901,1972) 4014800100004 (J,SJA,33,1045,1972) 4014800100005 AUTHOR (K.E.Volodin,V.E.Kuznetsov,V.G.Nesterov,B.Nurpeisov, 4014800100006 L.I.Prokhorova,Yu.M.Turchin,G.N.Smirenkin) 4014800100007 TITLE Average number of prompt neutrons Nu-bar for PU-239 4014800100008 fission by neutrons having an energy up TO 1.6 MeV 4014800100009 REL-REF (D,40033003,V.G.Nesterov+,C,70HELSINKI,2,167,197006) 4014800100010 Subents 003, 005. See COMMENT. 4014800100011 COMMENT Of authors. Previously measured data published in 4014800100012 70HELSINKI are considered as overruled due to strong 4014800100013 disagreement with this measurement in energy range 4014800100014 0.4 < En< 1.3 MeV caused by high ( ~10 times this one) 4014800100015 admixture of Pu-240 in the sample used at the previous 4014800100016 measurement. 4014800100017 FACILITY (VDGT) Tandem Van De Graaff 4014800100018 INC-SOURCE (P-T) Proton-tritium 4014800100019 METHOD (COINC) Coincidence of pulses from fission fragments4014800100020 and neutrons detectors were registered. 4014800100021 PART-DET (FF) Fission fragments 4014800100022 (N) Neutrons 4014800100023 SAMPLE Pu-240 admixture ~0.15 %. 4014800100024 HISTORY (19730615C) Compiled at the centre 4014800100025 (20151123A) M.M. Ref.of Engl.translation was added. 4014800100026 Article was checked, BIB information was updated. 4014800100027 Reactions and units were corrected. 4014800100028 ENDBIB 26 0 4014800100029 NOCOMMON 0 0 4014800100030 ENDSUBENT 29 0 4014800199999 SUBENT 40148002 20151123 41724014800200001 BIB 6 18 4014800200002 REACTION ((94-PU-239(N,F),PR,NU)/(98-CF-252(0,F),PR,NU)) 4014800200003 Relative to value of average number of prompt neutrons4014800200004 in CF-252 spontaneous fission . 4014800200005 DETECTOR (PROPC) Proportional counter. System of 24 He-3 4014800200006 counters in cylindrical paraffin block . 4014800200007 (IOCH) Multilayer ionization chamber. 85 % counting 4014800200008 efficiency for fis.fragments. 4014800200009 16 layers of PuO2, 7mg of Pu-239 each layer. 4014800200010 CORRECTION Difference of detector efficiency at fragments and 4014800200011 neutrons registration in Cf-252 And Pu-239 fissions 4014800200012 was taken into account 4014800200013 ERR-ANALYS (DATA-ERR) Statistical error,error of data 4014800200014 dispersion of individual measurement cycles and 4014800200015 correction error were taken into account. 4014800200016 (ERR-1,0.4,0.5) Error of correction coefficient. 4014800200017 STATUS (TABLE) Table 1 of AE,33,(5),901,1972 4014800200018 HISTORY (20151123A) M.M. ARB-UNITS -> NO-DIM. 4014800200019 Reaction was corrected as ratio. 4014800200020 ENDBIB 18 0 4014800200021 NOCOMMON 0 0 4014800200022 DATA 4 16 4014800200023 EN EN-ERR DATA DATA-ERR 4014800200024 MEV MEV NO-DIM NO-DIM 4014800200025 2.5000E-08 7.6790E-01 4.0000E-03 4014800200026 8.0000E-02 7.6890E-01 6.9000E-03 4014800200027 4.0000E-01 5.7000E-02 7.7590E-01 4.5000E-03 4014800200028 5.5000E-01 5.8000E-02 7.8670E-01 7.7000E-03 4014800200029 7.0000E-01 5.8000E-02 7.8840E-01 6.0000E-03 4014800200030 8.0000E-01 4.9000E-02 7.9640E-01 6.4000E-03 4014800200031 9.0000E-01 4.5000E-02 7.9250E-01 5.3000E-03 4014800200032 1.0000E+00 4.3000E-02 8.0260E-01 7.7000E-03 4014800200033 1.1000E+00 3.5000E-02 8.0970E-01 5.0000E-03 4014800200034 1.1500E+00 3.5000E-02 8.0360E-01 6.1000E-03 4014800200035 1.2000E+00 3.5000E-02 7.9890E-01 5.4000E-03 4014800200036 1.2500E+00 3.5000E-02 8.3060E-01 5.4000E-03 4014800200037 1.3000E+00 4.3000E-02 8.2130E-01 7.1000E-03 4014800200038 1.4000E+00 4.2000E-02 8.2970E-01 7.5000E-03 4014800200039 1.5000E+00 4.2000E-02 8.2970E-01 7.7000E-03 4014800200040 1.6000E+00 4.2000E-02 8.3020E-01 8.8000E-03 4014800200041 ENDDATA 18 0 4014800200042 ENDSUBENT 41 0 4014800299999 SUBENT 40148003 20151123 41724014800300001 BIB 8 21 4014800300002 REACTION (94-PU-239(N,F),PR,NU) 4014800300003 DETECTOR (PROPC) Proportional counters. System of 24 He-3 4014800300004 counters in cylindrical paraffin block . 4014800300005 (IOCH) Multilayer ionization chamber. 85 % counting 4014800300006 efficiency for fis.fragments. 4014800300007 MONITOR (98-CF-252(0,F),PR,NU) 4014800300008 Data from G.Hanna et.al. Atomic 4014800300009 Energy Review,7,No.3,4,(1969) 4014800300010 MONIT-REF ((MONIT),C.Hanna+,J,REA,7,4,1969) 4014800300011 STATUS (DEP,40148002) Dependent data. See SUBENT 40148002 4014800300012 directly measure ratio. 4014800300013 (TABLE) Table 1 of AE,33,(5),901,1972 4014800300014 CORRECTION Difference of detector efficiency at fragments and 4014800300015 neutrons registration in Cf-252 and Pu-239 fissions 4014800300016 was taken into account 4014800300017 ERR-ANALYS (DATA-ERR) Statistical error,error of data 4014800300018 dispersion of individual measurement cycles and 4014800300019 correction error were taken into account. 4014800300020 Error of standard was not taken into account. 4014800300021 HISTORY (20151123A) M.M. NO-DIM -> PRT/FIS. 4014800300022 MONIT-REF was added. 4014800300023 ENDBIB 21 0 4014800300024 COMMON 1 3 4014800300025 MONIT 4014800300026 NO-DIM 4014800300027 3.756 4014800300028 ENDCOMMON 3 0 4014800300029 DATA 4 16 4014800300030 EN EN-ERR DATA DATA-ERR 4014800300031 MEV MEV PRT/FIS PRT/FIS 4014800300032 2.5000E-08 2.8840E+00 2.6000E-02 4014800300033 8.0000E-02 2.8880E+00 2.6000E-02 4014800300034 4.0000E-01 5.7000E-02 2.9140E+00 1.7000E-02 4014800300035 5.5000E-01 5.8000E-02 2.9550E+00 2.9000E-02 4014800300036 7.0000E-01 5.8000E-02 2.9610E+00 2.3000E-02 4014800300037 8.0000E-01 4.9000E-02 2.9910E+00 2.4000E-02 4014800300038 9.0000E-01 4.5000E-02 2.9770E+00 2.0000E-02 4014800300039 1.0000E+00 4.3000E-02 3.0150E+00 2.9000E-02 4014800300040 1.1000E+00 3.5000E-02 3.0410E+00 1.9000E-02 4014800300041 1.1500E+00 3.5000E-02 3.0180E+00 2.3000E-02 4014800300042 1.2000E+00 3.5000E-02 3.0010E+00 2.0000E-02 4014800300043 1.2500E+00 3.5000E-02 3.1200E+00 2.0000E-02 4014800300044 1.3000E+00 4.3000E-02 3.0850E+00 2.9000E-02 4014800300045 1.4000E+00 4.2000E-02 3.1160E+00 2.8000E-02 4014800300046 1.5000E+00 4.2000E-02 3.1160E+00 2.9000E-02 4014800300047 1.6000E+00 4.2000E-02 3.1180E+00 3.3000E-02 4014800300048 ENDDATA 18 0 4014800300049 ENDSUBENT 48 0 4014800399999 SUBENT 40148004 20151123 41724014800400001 BIB 7 22 4014800400002 REACTION ((94-PU-239(N,F),PR,NU)//(94-PU-239(N,F),PR,NU)) 4014800400003 Relative to value at 0.40 MeV 4014800400004 SAMPLE ~ 30 g Pu as metal disk (3 mm thickness) with layers 4014800400005 of PuO2 of ~ 1 mg/cm2 thickness on both sides. 4014800400006 DETECTOR (THRES) Threshold detector - multilayer thorium chamber4014800400007 4 g of ThO2. 4014800400008 (IOCH) Double ionization chamber 4014800400009 CORRECTION Corrections for dependence of 4014800400010 A) angle correlation of fission neutron - initial 4014800400011 neutron, 4014800400012 B)fission neutron spectrum, 4014800400013 C)fissions distributions across the radius and the 4014800400014 thickness of the disk, 4014800400015 D)frequent scattering and multiplication of neutrons 4014800400016 in the disk 4014800400017 from energy of bombardment neutrons were introduced . 4014800400018 Contribution of delayed neutrons was considered as 4014800400019 negligible. 4014800400020 ERR-ANALYS (DATA-ERR) No information available 4014800400021 STATUS (TABLE) Table 2 of AE,33,(5),901,1972 4014800400022 HISTORY (20151123A) M.M. ARB-UNITS -> NO-DIM. 4014800400023 Reaction was corrected as ratio. 4014800400024 ENDBIB 22 0 4014800400025 COMMON 1 3 4014800400026 EN-DN 4014800400027 MEV 4014800400028 0.40 4014800400029 ENDCOMMON 3 0 4014800400030 DATA 4 7 4014800400031 EN-NM EN-ERR DATA DATA-ERR 4014800400032 MEV MEV NO-DIM NO-DIM 4014800400033 8.0000E-02 9.9230E-01 6.8000E-03 4014800400034 2.0000E-01 3.5000E-02 9.9320E-01 6.7000E-03 4014800400035 3.0000E-01 3.3000E-02 9.9710E-01 4.6000E-03 4014800400036 4.0000E-01 3.2000E-02 1.000 4014800400037 5.0000E-01 3.1000E-02 1.0105E+00 5.8000E-03 4014800400038 6.0000E-01 3.0000E-02 1.0085E+00 5.0000E-03 4014800400039 7.0000E-01 2.9000E-02 1.0199E+00 5.5000E-03 4014800400040 ENDDATA 9 0 4014800400041 ENDSUBENT 40 0 4014800499999 SUBENT 40148005 20151123 41724014800500001 BIB 9 24 4014800500002 REACTION (94-PU-239(N,F),PR,NU) 4014800500003 DETECTOR (THRES) Threshold detector - multilayer thorium chamber4014800500004 (IOCH) Double ionization chamber 4014800500005 MONITOR (94-PU-239(N,F),PR,NU) Measured at this work, 4014800500006 see SUBENT 40148003 4014800500007 MONIT-REF (40148003,K.E.Volodin+,J,AE,33,(5),901,1972) 4014800500008 MISC-COL (MISC) Error in normalization energy EN-NRM 4014800500009 STATUS (DEP,40148004) Dependent data. See SUBENT 40148004 - 4014800500010 directly measured ratio. 4014800500011 (TABLE) Table 2 of AE,33,(5),901,1972 4014800500012 CORRECTION Corrections for dependence of 4014800500013 A) angle correlation of fission neutron - initial 4014800500014 neutron, 4014800500015 B)fission neutron spectrum, 4014800500016 C)fissions distributions across the radius and the 4014800500017 thickness of the disk, 4014800500018 D)frequent scattering and multiplication of neutrons 4014800500019 in the disk 4014800500020 from energy of bombardment neutrons were introduced. 4014800500021 ERR-ANALYS (DATA-ERR) No information available 4014800500022 HISTORY (20151123A) M.M. NO-DIM -> PRT/FIS. 4014800500023 MONIT-REF was added. 4014800500024 Value at 0.400 MeV was deleted from DATA block - 4014800500025 MONIT value. 4014800500026 ENDBIB 24 0 4014800500027 COMMON 4 3 4014800500028 EN-NRM MISC MONIT MONIT-ERR 4014800500029 MEV MEV PRT/FIS PRT/FIS 4014800500030 0.400 5.7000E-02 2.914 0.017 4014800500031 ENDCOMMON 3 0 4014800500032 DATA 4 7 4014800500033 EN EN-ERR DATA DATA-ERR 4014800500034 MEV MEV PRT/FIS PRT/FIS 4014800500035 8.0000E-02 2.8920E+00 2.8000E-02 4014800500036 2.0000E-01 3.5000E-02 2.9120E+00 2.8000E-02 4014800500037 3.0000E-01 3.3000E-02 2.9060E+00 2.4000E-02 4014800500038 4.0000E-01 3.2000E-02 2.9140E+00 1.7000E-02 4014800500039 5.0000E-01 3.1000E-02 2.9450E+00 2.6000E-02 4014800500040 6.0000E-01 3.0000E-02 2.9390E+00 2.5000E-02 4014800500041 7.0000E-01 2.9000E-02 2.9720E+00 2.6000E-02 4014800500042 ENDDATA 9 0 4014800500043 ENDSUBENT 42 0 4014800599999 ENDENTRY 5 0 4014899999999