ENTRY 40509 20210920 42004050900000001 SUBENT 40509001 20210920 42004050900100001 BIB 8 31 4050900100002 TITLE Measurement of the 240Pu/235U and 242Pu/235U fission 4050900100003 cross-section ratios for 0.127-7.4-MeV neutrons 4050900100004 AUTHOR (V.M.Kupriyanov, B.I.Fursov, B.K.Maslennikov, 4050900100005 V.M.Surin, G.N.Smirenkin) 4050900100006 INSTITUTE (4RUSFEI) 4050900100007 REFERENCE (J,SJA,46,35,1979) 4050900100008 #doi:10.1007/BF01119949 4050900100009 (J,AE,46,35,1979) Russian orig. of J,SJA,46,35,1979 4050900100010 (P,YFI-26,3,1978) 4050900100011 (R,INDC(CCP)-133,1,1978) Engl.translation of YFI-26,3 4050900100012 Shape ratio normalized to absolute ratio in tables, 4050900100013 data in Subents 002,003. 4050900100014 FACILITY (VDG,4RUSFEI) 4050900100015 INC-SOURCE (P-LI7) En=0.127- 0.342 MeV 4050900100016 (P-T) En=0.313- 3.4 MeV 4050900100017 (D-D) En=3.6 - 7.4 MeV 4050900100018 DETECTOR (IOCH) Double ionization chambers for fission fragments4050900100019 HISTORY (19800529C) 4050900100020 (20070920A) BIB and COMMON information was added in 4050900100021 SUBENTS .002,.003. SUBENTs .004 and .005 were added. 4050900100022 Misprint in MONITOR value (in Table 2 of articles) was4050900100023 corrected, see SUBENTs 004, 005 . M.M. 4050900100024 (20120308A) Subents 002,003 data were corrected as 4050900100025 given in tables of article. 4050900100026 Ref. J,SJA,46,35,1979 was added. 4050900100027 (20190722A) On. Major revisions in 002-005. 4050900100028 (20200820A) M.M. Ref. INDC(CCP)-133,1,1978 was added. 4050900100029 Revision of Subents 004,005. 4050900100030 Status was updated in Subents .002, .003. 4050900100031 (20210920A) On. Major revisions in 004-005. 4050900100032 (20210920U) M.M. Minor correction of free text. 4050900100033 ENDBIB 31 0 4050900100034 NOCOMMON 0 0 4050900100035 ENDSUBENT 34 0 4050900199999 SUBENT 40509002 20210920 42004050900200001 BIB 8 32 4050900200002 REACTION ((94-PU-240(N,F),,SIG)/(92-U-235(N,F),,SIG)) 4050900200003 MONITOR ((94-PU-240(N,F),,SIG)/(92-U-235(N,F),,SIG)) 4050900200004 Absolute ratios at 0.975,1.5,2.0,2.5,3.0 MeV 4050900200005 SAMPLE Layers of uranium and plutonium oxide on Pt or Al 4050900200006 backings of 0.07-0.1 mm thickness 4050900200007 (94-PU-240,ENR=0.9949) 4050900200008 (92-U-235,ENR=0.999955) 4050900200009 ANALYSIS 240Pu(n,f)/235U(n,f) shape normalized to the absolute 4050900200010 ratios measured with the threshold method 4050900200011 CORRECTION Corrected for 4050900200012 - background in laboratory 4050900200013 (0.6-0.8% near threshold, less than 0.4% at En>1 MeV)4050900200014 - neutron scattered by target structure 4050900200015 (9-12% at En<0.342 MeV, 3-5% at En=1-2 MeV, less 4050900200016 than 0.5% at En>4 MeV) 4050900200017 - low energy (p,n) and (d,n) neutrons: 4050900200018 235U(n,f): less than 4.4-5% at En=3.4 MeV but reach 4050900200019 30% for (d,n) neutrons. 4050900200020 242Pu(n,f)/235U(n,f): less than 1.8-2.1% for (p,n) 4050900200021 neutrons at En<3.4 MeV and 1.5-4.5% for (d,n) 4050900200022 neutrons at En=5.5-7.4 MeV. 4050900200023 ERR-ANALYS (ERR-T) Root-mean-square sum of all uncertainties from 4050900200024 - Energy dependence of the shape ratio 4050900200025 (ERR-1) Absolute ratios for normalization (1.8%)4050900200026 (ERR-2) Normalization procedure of shape (0.25%)4050900200027 STATUS (DEP,40509004) Absolute ratios for normalization 4050900200028 (TABLE) Table 4 of Sov.J.Atom.Energy 46(1979)35, 4050900200029 Table 1 of INDC(CCP)-133,1,1978 4050900200030 HISTORY (20190722A) On. CORRECTION and ERR-ANALYS revised. 4050900200031 EN-ERR -> EN-RSL. ERR-T=2.2% -> 2.1% at 3.2 MeV 4050900200032 (20200820U) M.M. Status was updated. 4050900200033 (20210920U) On. Minor correction under HISTORY. 4050900200034 ENDBIB 32 0 4050900200035 COMMON 2 3 4050900200036 ERR-1 ERR-2 4050900200037 PER-CENT PER-CENT 4050900200038 1.8 0.25 4050900200039 ENDCOMMON 3 0 4050900200040 DATA 4 73 4050900200041 EN EN-RSL DATA ERR-T 4050900200042 MEV KEV NO-DIM PER-CENT 4050900200043 0.127 19. 0.0534 4.8 4050900200044 0.150 19. 0.0544 4.3 4050900200045 0.180 19. 0.0574 3.6 4050900200046 0.210 18. 0.0639 3.8 4050900200047 0.240 17. 0.0696 3.9 4050900200048 0.270 18. 0.0817 3.6 4050900200049 0.300 18. 0.0898 3.6 4050900200050 0.313 40. 0.107 3.3 4050900200051 0.342 38. 0.119 2.6 4050900200052 0.365 37. 0.140 2.9 4050900200053 0.404 36. 0.174 2.3 4050900200054 0.444 35. 0.224 2.2 4050900200055 0.483 34. 0.306 2.2 4050900200056 0.523 33. 0.393 2.2 4050900200057 0.562 33. 0.498 2.2 4050900200058 0.601 32. 0.598 2.2 4050900200059 0.641 32. 0.695 2.2 4050900200060 0.680 32. 0.754 2.2 4050900200061 0.720 32. 0.818 2.1 4050900200062 0.759 31. 0.905 2.2 4050900200063 0.798 31. 0.976 2.1 4050900200064 0.836 31. 1.060 2.2 4050900200065 0.877 31. 1.130 2.1 4050900200066 0.926 31. 1.144 2.1 4050900200067 0.975 31. 1.189 2.1 4050900200068 1.025 34. 1.243 2.1 4050900200069 1.074 37. 1.261 2.1 4050900200070 1.123 40. 1.259 2.1 4050900200071 1.172 42. 1.274 2.1 4050900200072 1.221 44. 1.257 2.1 4050900200073 1.270 45. 1.270 2.1 4050900200074 1.320 46. 1.270 2.2 4050900200075 1.400 47. 1.268 2.1 4050900200076 1.500 48. 1.275 2.0 4050900200077 1.600 49. 1.294 2.1 4050900200078 1.700 60. 1.300 2.2 4050900200079 1.800 61. 1.304 2.1 4050900200080 1.900 63. 1.296 2.1 4050900200081 2.00 60. 1.314 2.0 4050900200082 2.10 68. 1.309 2.0 4050900200083 2.20 70. 1.316 2.0 4050900200084 2.30 71. 1.318 2.0 4050900200085 2.40 72. 1.330 2.0 4050900200086 2.50 73. 1.332 2.0 4050900200087 2.60 77. 1.337 2.0 4050900200088 2.70 78. 1.336 2.0 4050900200089 2.80 79. 1.357 2.0 4050900200090 2.90 82. 1.363 2.0 4050900200091 3.00 84. 1.369 2.1 4050900200092 3.10 86. 1.377 2.0 4050900200093 3.20 88. 1.375 2.1 4050900200094 3.30 91. 1.384 2.0 4050900200095 3.40 93. 1.380 2.0 4050900200096 3.60 192. 1.383 2.0 4050900200097 3.80 182. 1.382 2.0 4050900200098 4.00 146. 1.397 2.1 4050900200099 4.20 141. 1.404 2.2 4050900200100 4.40 132. 1.402 2.2 4050900200101 4.60 131. 1.394 2.2 4050900200102 4.80 125. 1.403 2.2 4050900200103 5.00 126. 1.413 2.2 4050900200104 5.20 129. 1.432 2.2 4050900200105 5.40 131. 1.450 2.2 4050900200106 5.60 135. 1.468 2.3 4050900200107 5.80 138. 1.487 2.3 4050900200108 6.00 142. 1.488 2.3 4050900200109 6.20 147. 1.453 2.3 4050900200110 6.40 152. 1.406 2.4 4050900200111 6.60 160. 1.380 2.6 4050900200112 6.80 167. 1.344 2.5 4050900200113 7.00 173. 1.330 2.5 4050900200114 7.20 178. 1.305 2.6 4050900200115 7.40 183. 1.283 2.8 4050900200116 ENDDATA 75 0 4050900200117 ENDSUBENT 116 0 4050900299999 SUBENT 40509003 20210920 42004050900300001 BIB 8 34 4050900300002 REACTION ((94-PU-242(N,F),,SIG)/(92-U-235(N,F),,SIG)) 4050900300003 MONITOR ((94-PU-242(N,F),,SIG)/(92-U-235(N,F),,SIG)) 4050900300004 Absolute ratios at 0.975,1.5,2.0,2.5,3.0 MeV 4050900300005 SAMPLE Layers of uranium and plutonium oxide on Pt or Al 4050900300006 backings of 0.07-0.1 mm thickness 4050900300007 (94-PU-242,ENR=0.9992) 4050900300008 (92-U-235,ENR=0.999955) 4050900300009 ANALYSIS 242Pu(n,f)/235U(n,f) shape normalized to the absolute 4050900300010 ratios measured with the threshold method 4050900300011 CORRECTION Corrected for 4050900300012 - background in laboratory 4050900300013 (0.6-0.8% near threshold, less than 0.4% at En>1 MeV)4050900300014 - neutron scattered by target structure 4050900300015 (9-12% at En<0.342 MeV, 3-5% at En=1-2 MeV, less 4050900300016 than 0.5% at En>4 MeV) 4050900300017 - low energy (p,n) and (d,n) neutrons: 4050900300018 235U(n,f): less than 4.4-5% at En=3.4 MeV but reach 4050900300019 30% for (d,n) neutrons. 4050900300020 242Pu(n,f)/235U(n,f): less than 1.8-2.1% for (p,n) 4050900300021 neutrons at En<3.4 MeV and 1.5-4.5% for (d,n) 4050900300022 neutrons at En=5.5-7.4 MeV. 4050900300023 ERR-ANALYS (ERR-T) Root-mean-square sum of all uncertainties from 4050900300024 - Energy dependence of the shape ratio 4050900300025 (ERR-1) Absolute ratios for normalization (2.0%)4050900300026 (ERR-2) Normalization procedure of shape (0.25%)4050900300027 STATUS (DEP,40509005) Absolute ratios for normalization 4050900300028 (TABLE) Table 4 of Sov.J.Atom.Energy 46(1979)35 4050900300029 Table 1 of INDC(CCP)-133,1,1978 4050900300030 HISTORY (20130208A) M.M. Duplicative points were deleted, 4050900300031 several points were added as given in Table 4. 4050900300032 (20190722A) On. CORRECTION and ERR-ANALYS revised. 4050900300033 EN-ERR -> EN-RSL. ERR-T=2.1% -> 2.2% at 1.6 MeV 4050900300034 (20200820U) M.M. Status was updated. 4050900300035 (20210920U) On. Minor correction under HISTORY. 4050900300036 ENDBIB 34 0 4050900300037 COMMON 2 3 4050900300038 ERR-1 ERR-2 4050900300039 PER-CENT PER-CENT 4050900300040 2.0 0.25 4050900300041 ENDCOMMON 3 0 4050900300042 DATA 4 73 4050900300043 EN EN-RSL DATA ERR-T 4050900300044 MEV KEV NO-DIM PER-CENT 4050900300045 0.127 19. 0.0100 5.7 4050900300046 0.150 19. 0.0136 4.6 4050900300047 0.180 19. 0.0159 5.3 4050900300048 0.210 18. 0.0193 5.3 4050900300049 0.240 17. 0.0293 5.4 4050900300050 0.270 18. 0.0310 4.9 4050900300051 0.300 18. 0.0401 3.7 4050900300052 0.313 40. 0.0533 4.0 4050900300053 0.342 38. 0.0623 4.2 4050900300054 0.365 37. 0.0781 3.5 4050900300055 0.404 36. 0.0958 3.0 4050900300056 0.444 35. 0.0130 2.6 4050900300057 0.483 34. 0.0173 2.3 4050900300058 0.523 33. 0.0209 2.4 4050900300059 0.562 33. 0.0284 2.5 4050900300060 0.601 32. 0.0359 2.3 4050900300061 0.641 32. 0.0428 2.3 4050900300062 0.680 32. 0.0491 2.5 4050900300063 0.720 32. 0.0557 2.2 4050900300064 0.759 31. 0.0670 2.3 4050900300065 0.798 31. 0.0781 2.3 4050900300066 0.836 31. 0.0881 2.3 4050900300067 0.877 31. 0.0977 2.3 4050900300068 0.926 31. 1.006 2.3 4050900300069 0.975 31. 1.104 2.2 4050900300070 1.025 34. 1.154 2.3 4050900300071 1.074 37. 1.197 2.2 4050900300072 1.123 40. 1.199 2.2 4050900300073 1.172 42. 1.187 2.2 4050900300074 1.221 44. 1.161 2.5 4050900300075 1.270 45. 1.143 2.4 4050900300076 1.320 46. 1.138 2.2 4050900300077 1.400 47. 1.141 2.3 4050900300078 1.500 48. 1.100 2.2 4050900300079 1.600 49. 1.111 2.2 4050900300080 1.700 60. 1.113 2.2 4050900300081 1.800 61. 1.123 2.2 4050900300082 1.900 63. 1.121 2.2 4050900300083 2.00 60. 1.135 2.2 4050900300084 2.10 68. 1.125 2.3 4050900300085 2.20 70. 1.107 2.2 4050900300086 2.30 71. 1.106 2.6 4050900300087 2.40 72. 1.100 2.2 4050900300088 2.50 73. 1.107 2.2 4050900300089 2.60 77. 1.119 2.3 4050900300090 2.70 78. 1.127 2.5 4050900300091 2.80 79. 1.144 2.2 4050900300092 2.90 82. 1.144 2.2 4050900300093 3.00 84. 1.148 2.2 4050900300094 3.10 86. 1.159 2.2 4050900300095 3.20 88. 1.153 2.2 4050900300096 3.30 91. 1.153 2.2 4050900300097 3.40 93. 1.147 2.2 4050900300098 3.60 192. 1.152 2.2 4050900300099 3.80 182. 1.150 2.2 4050900300100 4.00 146. 1.152 2.3 4050900300101 4.20 141. 1.145 2.2 4050900300102 4.40 132. 1.147 2.2 4050900300103 4.60 131. 1.146 2.3 4050900300104 4.80 125. 1.142 2.3 4050900300105 5.00 126. 1.147 2.2 4050900300106 5.20 129. 1.156 2.6 4050900300107 5.40 131. 1.182 2.3 4050900300108 5.60 135. 1.209 2.3 4050900300109 5.80 138. 1.239 2.2 4050900300110 6.00 142. 1.279 2.3 4050900300111 6.20 147. 1.274 2.3 4050900300112 6.40 152. 1.273 2.4 4050900300113 6.60 160. 1.263 2.6 4050900300114 6.80 167. 1.226 2.8 4050900300115 7.00 173. 1.190 2.8 4050900300116 7.20 178. 1.178 2.9 4050900300117 7.40 183. 1.167 3.0 4050900300118 ENDDATA 75 0 4050900300119 ENDSUBENT 118 0 4050900399999 SUBENT 40509004 20210920 42004050900400001 BIB 10 40 4050900400002 REACTION 1((94-PU-240(N,F),,SIG)/(94-PU-239(N,F),,SIG)) 4050900400003 2((94-PU-240(N,F),,SIG)/(92-U-235(N,F),,SIG)) 4050900400004 MONITOR 2((94-PU-239(N,F),,SIG)/(92-U-235(N,F),,SIG)) 4050900400005 MONIT-REF 2(40824003,B.I.Fursov+,J,AE,43,261,1977) 4050900400006 SAMPLE Mixture sample with the following isotopic abundance: 4050900400007 Pu-238: <0.0705%, Pu-239: 6.7435+/-0.0145%, 4050900400008 Pu-240: 92.7611%, Pu-241: 0.2657+/-0.0012%, 4050900400009 Pu-242: 0.1592+/-0.0010% 4050900400010 Standard 239Pu sample: 4050900400011 Pu-239: 99.9%. 4050900400012 METHOD Threshold method for absolute measurement 4050900400013 CORRECTION Corrections at 3 MeV: 4050900400014 - Difference of neutron fluxes through layers (2.1%)4050900400015 - Fission of minority isotopes (8.0%)4050900400016 - Energy dependence of fission efficiency ratio (1.6%)4050900400017 - Neutron background in laboratory (0.3%)4050900400018 - Neutrons scattered by target (0.3%)4050900400019 - Neutrons from accompanying (p,n) reactions (0.8%)4050900400020 Not corrected for 4050900400021 - Neutron scatting by backings. 4050900400022 ERR-ANALYS (ERR-T) Root-mean-square sum of all uncertainties 4050900400023 at 3 MeV: 4050900400024 - Difference of neutron fluxes through layers (0.2%)4050900400025 - Statistical error with fast neutrons (0.5%)4050900400026 - Fission of minority isotopes (0.2%)4050900400027 - Energy dependence of fission efficiency ratio (0.4%)4050900400028 - Neutron background in laboratory (0.2%)4050900400029 - Neutrons scattered by target (0.3%)4050900400030 - Neutrons from accompanying (p,n) reactions (0.4%)4050900400031 - Neutron scatting by backings (0.5%)4050900400032 (ERR-1) Ratio of numbers of fissionable nuclei (0.6%)4050900400033 2(MONIT-ERR) Monitor error, 1.4-1.5 %, average 1.41 % 4050900400034 COMMENT Misprint in Table 2 of Sov.J.Atom.Energy 46(1979)35 4050900400035 was corrected by compiler: 4050900400036 1.154 -> 1.554 at 2.00 MeV (c.f. 40824.003). 4050900400037 STATUS (TABLE) Table 2 of Sov.J.Atom.Energy 46(1979)35 4050900400038 HISTORY (20190722A) On. CORRECTION added. ERR-ANALYS revised. 4050900400039 (20200820U) M.M. MONIT 2 with MONIT-ERR 2 values were 4050900400040 re-stored in DATA block. 4050900400041 (20210920A) On. PER-CENT->NO-DIM MONIT: 1.554 -> 1.154.4050900400042 ENDBIB 40 0 4050900400043 COMMON 1 3 4050900400044 ERR-1 4050900400045 PER-CENT 4050900400046 0.6 4050900400047 ENDCOMMON 3 0 4050900400048 DATA 8 5 4050900400049 EN EN-RSL DATA 1ERR-T 1DATA 2ERR-T 24050900400050 MONIT 2MONIT-ERR 2 4050900400051 MEV KEV NO-DIM NO-DIM NO-DIM NO-DIM 4050900400052 NO-DIM NO-DIM 4050900400053 0.975 31. 0.827 0.009 1.194 0.022 4050900400054 1.443 0.021 4050900400055 1.50 49. 0.809 0.009 1.271 0.023 4050900400056 1.572 0.022 4050900400057 2.00 60. 0.841 0.010 1.307 0.024 4050900400058 1.154 0.022 4050900400059 2.50 75. 0.854 0.010 1.321 0.024 4050900400060 1.547 0.022 4050900400061 3.0 84. 0.884 0.011 1.375 0.025 4050900400062 1.556 0.022 4050900400063 ENDDATA 14 0 4050900400064 ENDSUBENT 63 0 4050900499999 SUBENT 40509005 20210920 42004050900500001 BIB 10 40 4050900500002 REACTION 1((94-PU-242(N,F),,SIG)/(94-PU-239(N,F),,SIG)) 4050900500003 2((94-PU-242(N,F),,SIG)/(92-U-235(N,F),,SIG)) 4050900500004 MONITOR 2((94-PU-239(N,F),,SIG)/(92-U-235(N,F),,SIG)) 4050900500005 MONIT-REF 2(40824003,B.I.Fursov+,J,AE,43,261,1977) 4050900500006 SAMPLE Mixture sample with the following isotopic abundance: 4050900500007 Pu-238: <0.0047%, Pu-239: 5.7975+/-0.0269%, 4050900500008 Pu-240: 0.0596+/-0.0005%, Pu-241: 0.0592+/-0.0005%, 4050900500009 Pu-242: 94.0790% 4050900500010 Standard 239Pu sample: 4050900500011 Pu-239: 99.9%. 4050900500012 METHOD Threshold method for absolute measurement 4050900500013 CORRECTION Corrections at 3 MeV: 4050900500014 - Difference of neutron fluxes through layers (1.4%)4050900500015 - Fission of minority isotopes (8.0%)4050900500016 - Energy dependence of fission efficiency ratio (1.6%)4050900500017 - Neutron background in laboratory (0.3%)4050900500018 - Neutrons scattered by target (0.2%)4050900500019 - Neutrons from accompanying (p,n) reactions (0.6%)4050900500020 Not corrected for 4050900500021 - Neutron scatting by backings. 4050900500022 ERR-ANALYS (ERR-T) Root-mean-square sum of all uncertainties 4050900500023 at 3 MeV: 4050900500024 - Difference of neutron fluxes through layers (0.2%)4050900500025 - Statistical error with fast neutrons (0.4%)4050900500026 - Fission of minority isotopes (0.2%)4050900500027 - Energy dependence of fission efficiency ratio (0.4%)4050900500028 - Neutron background in laboratory (0.2%)4050900500029 - Neutrons scattered by target (0.3%)4050900500030 - Neutrons from accompanying (p,n) reactions (0.4%)4050900500031 - Neutron scatting by backings (0.5%)4050900500032 (ERR-1) Ratio of numbers fissionable nuclei (1.0%)4050900500033 2(MONIT-ERR) Monitor error, 1.4-1.5 %, average 1.41 % 4050900500034 COMMENT Misprint in Table 2 of Sov.J.Atom.Energy 46(1979)35 4050900500035 was corrected by compiler: 4050900500036 1.154 -> 1.554 at 2.00 MeV (c.f. 40824.003). 4050900500037 STATUS (TABLE) Table 2 of Sov.J.Atom.Energy 46(1979)35 4050900500038 HISTORY (20190722A) On. CORRECTION added. ERR-ANALYS revised. 4050900500039 (20200820U) MONIT 2 with MONIT-ERR 2 values were 4050900500040 re-stored in DATA block. 4050900500041 (20210920A) On. PER-CENT->NO-DIM MONIT: 1.554 -> 1.154.4050900500042 ENDBIB 40 0 4050900500043 COMMON 1 3 4050900500044 ERR-1 4050900500045 PER-CENT 4050900500046 1.0 4050900500047 ENDCOMMON 3 0 4050900500048 DATA 8 5 4050900500049 EN EN-RSL DATA 1ERR-T 1DATA 2ERR-T 24050900500050 MONIT 2MONIT-ERR 2 4050900500051 MEV KEV NO-DIM NO-DIM NO-DIM NO-DIM 4050900500052 NO-DIM NO-DIM 4050900500053 0.975 31. 0.763 0.011 1.101 0.022 4050900500054 1.443 0.021 4050900500055 1.50 49. 0.707 0.010 1.112 0.022 4050900500056 1.572 0.022 4050900500057 2.00 60. 0.730 0.010 1.134 0.020 4050900500058 1.154 0.022 4050900500059 2.50 75. 0.713 0.010 1.103 0.022 4050900500060 1.547 0.022 4050900500061 3.0 84. 0.734 0.010 1.142 0.022 4050900500062 1.556 0.022 4050900500063 ENDDATA 14 0 4050900500064 ENDSUBENT 63 0 4050900599999 ENDENTRY 5 0 4050999999999