ENTRY 41111 20221011 420941111 0 1 SUBENT 41111001 20221011 420941111 1 1 BIB 8 27 41111 1 2 TITLE Measurements of the fission cross section ratios 41111 1 3 232Th/235U and 234U/235U for 0.13-7.4 MeV neutrons 41111 1 4 AUTHOR (B.I.Fursov, E.Yu.Baranov, M.P.Klemyshev, B.F.Samylin, 41111 1 5 G.N.Smirenkin, Yu.M.Turchin) 41111 1 6 INSTITUTE (4RUSFEI) 41111 1 7 REFERENCE (J,SJA,71,827,1991) Engl.translation of AE,71,320,1991 41111 1 8 (J,AE,71,320,1991) Issue 4. 41111 1 9 (C,88MITO,,141,1988) Prelim.values in table and figs. 41111 1 10 FACILITY (VDG,4RUSFEI) Electrostatic accelerators 41111 1 11 INC-SOURCE (P-LI7,D-D,P-T) 41111 1 12 CORRECTION Corrected for 41111 1 13 - energy dependence of fission chamber efficiency 41111 1 14 < or = 1.6% 41111 1 15 - difference of neutron fluxes through fissile layers 41111 1 16 < or = 1.1% 41111 1 17 - fissile impurities and neutron inelastic scattering 41111 1 18 < or = 0.5 %41111 1 19 - neutron background of exp. hall - 0.3-0.7 % 41111 1 20 - neutron background from accompanying reactions - 41111 1 21 see details in the article. 41111 1 22 HISTORY (19921207C) + + Compiled at the centre - CJD + + 41111 1 23 (20010311U) Date is corrected. 4CCPFEI -> 4RUSFEI. 41111 1 24 (20151002A) M.M. Ref. of Engl.translation was added. 41111 1 25 Upper -> lower case correction. 41111 1 26 EN-RSL -> EN-RSL-HW. ERR-ANALYS was corrected. 41111 1 27 (20221011A) ON+VT. Major rev.in 002+003. 004-005 added.41111 1 28 (20221013U) M.M. Correction of free text. 41111 1 29 ENDBIB 27 0 41111 1 30 NOCOMMON 0 0 41111 1 31 ENDSUBENT 30 0 41111 199999 SUBENT 41111002 20221011 420941111 2 1 BIB 9 29 41111 2 2 REACTION ((90-TH-232(N,F),,SIG)/(92-U-235(N,F),,SIG)) 41111 2 3 SAMPLE - 232Th (678 ug, 232Th content 100%) 41111 2 4 - 235U (266 ug and 416 ug, 235U content 99.9955%) 41111 2 5 (90-TH-232,NAT=1.00) 41111 2 6 (92-U-235,ENR=0.999955) 41111 2 7 MONITOR ((90-TH-232(N,F),,SIG)/(92-U-235(N,F),,SIG)) 41111 2 8 MONIT-REF (41111004,B.I.Fursov+,J,SJA,71,827,1991) 41111 2 9 DETECTOR (FISCH) Two double ionization chambers above 0.85 MeV. 41111 2 10 FF registration efficiency 98-00 %. 41111 2 11 (TRD) Mica detectors below 0.85 MeV 41111 2 12 ANALYSIS Ratio measured by Mica detectors was normalized to 41111 2 13 the ratio measured by ionization chambers at 0.85 MeV 41111 2 14 ERR-ANALYS (ERR-T) Root mean square sum of 41111 2 15 (ERR-S,0.5,15.) 41111 2 16 Statistical uncertainty 41111 2 17 - in a large part of the energy range (0.5-1%) 41111 2 18 - in subthreshold region (10-15%) 41111 2 19 (MONIT-ERR) Reference values of 232Th/235U ratios(1.8%)41111 2 20 (ERR-1,0.3,0.4) Normalization procedure (0.3-0.4%)41111 2 21 does not include MONIT-ERR. 41111 2 22 (ERR-2,1.2,3.) Uncertainty due to corrections. 41111 2 23 Main contributions: 41111 2 24 - uncertainty of measurement of background due to 41111 2 25 accompanying reactions, (2-3% at 7.4 MeV) 41111 2 26 - neutron scattering in subthreshold region (1.2-2%) 41111 2 27 STATUS (TABLE) Tables 2 and 3 of J,SJA,71,827,1991 41111 2 28 (DEP,41111004) 232Th/235U from absolute measurement 41111 2 29 HISTORY (20221011A) ON+VT. DATA: 0.0468 -> 0.0469 at 1.40 MeV; 41111 2 30 ERR-ANALYS updated. MONIT-ERR moved to COMMON. 41111 2 31 ENDBIB 29 0 41111 2 32 COMMON 1 3 41111 2 33 MONIT-ERR 41111 2 34 PER-CENT 41111 2 35 1.8 41111 2 36 ENDCOMMON 3 0 41111 2 37 DATA 5 67 41111 2 38 EN EN-RSL-HW DATA ERR-T MONIT 41111 2 39 MEV KEV NO-DIM PER-CENT NO-DIM 41111 2 40 0.13 32. 1.3 E-06 12. 41111 2 41 0.35 40. 3.7 E-06 15. 41111 2 42 0.40 38. 2.4 E-06 13. 41111 2 43 0.45 36. 4.3 E-06 14. 41111 2 44 0.50 35. 4.6 E-06 13. 41111 2 45 0.55 34. 3.6 E-06 15. 41111 2 46 0.60 33. 7.7 E-06 11. 41111 2 47 0.65 32. 9.5 E-06 12. 41111 2 48 0.70 32. 2.3 E-05 9.2 41111 2 49 0.75 31. 3.5 E-05 8.4 41111 2 50 0.80 31. 1.03E-04 7.1 41111 2 51 0.85 31. 1.70E-04 6.8 41111 2 52 0.90 30. 4.11E-04 6.4 41111 2 53 0.95 30. 7.67E-04 5.8 41111 2 54 1.00 31. 1.15E-03 5.5 41111 2 55 1.05 32. 1.38E-03 3.8 41111 2 56 1.10 33. 1.79E-03 4.4 41111 2 57 1.15 33. 2.98E-03 5.0 41111 2 58 1.20 33. 4.91E-03 4.2 41111 2 59 1.25 34. 9.28E-03 3.7 41111 2 60 1.30 34. 0.0214 4.0 41111 2 61 1.35 34. 0.0365 3.3 41111 2 62 1.40 34. 0.0469 2.9 41111 2 63 1.45 35. 0.0539 2.6 41111 2 64 1.50 35. 0.0674 2.9 0.0679 41111 2 65 1.55 35. 0.0871 2.8 41111 2 66 1.60 36. 0.0926 2.4 41111 2 67 1.65 36. 0.0823 2.2 41111 2 68 1.70 36. 0.0742 2.3 41111 2 69 1.80 72. 0.0763 2.4 41111 2 70 1.90 71. 0.0926 2.2 41111 2 71 2.0 71. 0.0994 2.2 0.0992 41111 2 72 2.1 70. 0.106 2.2 41111 2 73 2.2 70. 0.113 2.2 41111 2 74 2.3 69. 0.102 2.2 41111 2 75 2.4 69. 0.0962 2.3 41111 2 76 2.5 68. 0.100 2.4 0.0989 41111 2 77 2.6 68. 0.102 2.4 41111 2 78 2.7 67. 0.107 2.3 41111 2 79 2.8 66. 0.112 2.4 41111 2 80 2.9 66. 0.117 2.4 41111 2 81 3.0 65. 0.118 2.5 0.1199 41111 2 82 3.1 66. 0.121 2.6 41111 2 83 3.2 66. 0.124 2.6 41111 2 84 3.3 66. 0.124 2.7 41111 2 85 3.4 66. 0.127 2.8 41111 2 86 3.5 66. 0.127 2.9 41111 2 87 3.6 67. 0.132 2.9 41111 2 88 3.8 228. 0.134 2.8 41111 2 89 4.0 167. 0.136 2.6 41111 2 90 4.2 156. 0.142 2.7 41111 2 91 4.4 138. 0.142 2.6 41111 2 92 4.6 130. 0.144 2.7 41111 2 93 4.8 116. 0.144 2.8 41111 2 94 5.0 110. 0.144 2.8 41111 2 95 5.2 105. 0.147 2.8 41111 2 96 5.4 103. 0.148 2.9 41111 2 97 5.6 102. 0.145 3.0 41111 2 98 5.8 130. 0.144 3.2 41111 2 99 6.0 126. 0.151 3.3 41111 2 100 6.2 122. 0.171 3.5 41111 2 101 6.4 118. 0.199 3.7 41111 2 102 6.6 117. 0.236 3.7 41111 2 103 6.8 117. 0.263 4.0 41111 2 104 7.0 118. 0.266 4.1 41111 2 105 7.2 120. 0.264 4.4 41111 2 106 7.4 122. 0.255 4.8 41111 2 107 ENDDATA 69 0 41111 2 108 ENDSUBENT 107 0 41111 299999 SUBENT 41111003 20221011 420941111 3 1 BIB 8 26 41111 3 2 REACTION ((92-U-234(N,F),,SIG)/(92-U-235(N,F),,SIG)) 41111 3 3 SAMPLE - 234U (393 ug, 234U content 98.04%) 41111 3 4 - 235U (266 ug and 416 ug, 235U content 99.9955%) 41111 3 5 (92-U-234,ENR=0.9804) 41111 3 6 (92-U-235,ENR=0.999955) 41111 3 7 MONITOR ((92-U-234(N,F),,SIG)/(92-U-235(N,F),,SIG)) 41111 3 8 MONIT-REF (41111005,B.I.Fursov+,J,SJA,71,827,1991) 41111 3 9 DETECTOR (FISCH) Two double ionization chambers 41111 3 10 FF registration efficiency 98-00 %. 41111 3 11 ERR-ANALYS (ERR-T) Root mean square sum of 41111 3 12 (ERR-S,0.3,3.) 41111 3 13 Statistical uncertainty 41111 3 14 - in a large part of the energy range (0.3-0.8%)41111 3 15 - in subthreshold region (1.5-3.%)41111 3 16 (MONIT-ERR) Reference values of 234U/235U ratios (1.6%)41111 3 17 (ERR-1,0.3,0.4) Normalization procedure (0.3-0.4%)41111 3 18 does not include MONIT-ERR. 41111 3 19 (ERR-2,1.2,3.) Uncertainty due to corrections. 41111 3 20 Main contributions: 41111 3 21 - uncertainty of measurement of background due to 41111 3 22 accompanying reactions, (2-3% at 7.4 MeV) 41111 3 23 - neutron scattering in subthreshold region (1.2-2%) 41111 3 24 STATUS (TABLE) Tables 2 and 3 of J,SJA,71,827,1991 41111 3 25 (DEP,41111005) 234U/235U from absolute measurement 41111 3 26 HISTORY (20221011A) ON+VT. ERR-ANALYS updated. 41111 3 27 MONIT-ERR moved to COMMON. 41111 3 28 ENDBIB 26 0 41111 3 29 COMMON 1 3 41111 3 30 MONIT-ERR 41111 3 31 PER-CENT 41111 3 32 1.6 41111 3 33 ENDCOMMON 3 0 41111 3 34 DATA 5 71 41111 3 35 EN EN-RSL-HW DATA ERR-T MONIT 41111 3 36 MEV KEV NO-DIM PER-CENT NO-DIM 41111 3 37 0.13 32. 0.0230 3.7 41111 3 38 0.17 31. 0.0277 2.9 41111 3 39 0.21 29. 0.0382 2.7 41111 3 40 0.25 26. 0.0486 2.8 41111 3 41 0.30 24. 0.0952 2.5 41111 3 42 0.35 40. 0.137 2.3 41111 3 43 0.40 38. 0.202 2.2 41111 3 44 0.45 36. 0.309 2.1 41111 3 45 0.50 35. 0.448 2.0 41111 3 46 0.55 34. 0.573 1.9 41111 3 47 0.60 33. 0.659 1.9 41111 3 48 0.65 32. 0.755 1.9 41111 3 49 0.70 32. 0.900 1.9 41111 3 50 0.75 31. 1.088 1.8 41111 3 51 0.80 31. 1.160 1.7 41111 3 52 0.85 31. 1.050 1.7 41111 3 53 0.90 30. 0.988 1.7 41111 3 54 0.95 30. 0.932 1.7 41111 3 55 1.00 31. 0.919 1.7 0.912 41111 3 56 1.05 32. 0.933 1.7 41111 3 57 1.10 33. 0.972 1.6 41111 3 58 1.15 33. 0.976 1.7 41111 3 59 1.20 33. 1.001 1.8 41111 3 60 1.25 34. 1.002 1.7 41111 3 61 1.30 34. 1.022 1.8 41111 3 62 1.35 34. 1.059 1.8 41111 3 63 1.40 34. 1.059 1.8 41111 3 64 1.45 35. 1.067 1.7 41111 3 65 1.50 35. 1.107 1.7 1.112 41111 3 66 1.55 35. 1.138 1.7 41111 3 67 1.60 36. 1.161 1.6 41111 3 68 1.65 36. 1.170 1.6 41111 3 69 1.70 36. 1.185 1.6 41111 3 70 1.80 72. 1.201 1.6 41111 3 71 1.90 71. 1.203 1.6 41111 3 72 2.0 71. 1.199 1.7 1.192 41111 3 73 2.1 70. 1.182 1.7 41111 3 74 2.2 70. 1.175 1.6 41111 3 75 2.3 69. 1.177 1.7 41111 3 76 2.4 69. 1.187 1.7 41111 3 77 2.5 68. 1.196 1.7 1.191 41111 3 78 2.6 68. 1.204 1.6 41111 3 79 2.7 67. 1.219 1.7 41111 3 80 2.8 66. 1.233 1.8 41111 3 81 2.9 66. 1.239 1.7 41111 3 82 3.0 65. 1.240 1.8 1.246 41111 3 83 3.1 66. 1.253 1.8 41111 3 84 3.2 66. 1.250 1.8 41111 3 85 3.3 66. 1.250 2.0 41111 3 86 3.4 66. 1.255 2.1 41111 3 87 3.5 66. 1.261 2.2 41111 3 88 3.6 67. 1.270 2.4 41111 3 89 3.8 228. 1.275 2.2 41111 3 90 4.0 167. 1.276 2.2 41111 3 91 4.2 156. 1.271 2.3 41111 3 92 4.4 138. 1.272 2.2 41111 3 93 4.6 130. 1.262 2.4 41111 3 94 4.8 116. 1.246 2.4 41111 3 95 5.0 110. 1.230 2.5 41111 3 96 5.2 105. 1.242 2.1 41111 3 97 5.4 103. 1.256 2.2 41111 3 98 5.6 102. 1.259 2.2 41111 3 99 5.8 130. 1.257 2.1 41111 3 100 6.0 126. 1.230 2.3 41111 3 101 6.2 122. 1.191 2.2 41111 3 102 6.4 118. 1.169 2.3 41111 3 103 6.6 117. 1.152 2.4 41111 3 104 6.8 117. 1.159 2.6 41111 3 105 7.0 118. 1.163 2.6 41111 3 106 7.2 120. 1.180 2.7 41111 3 107 7.4 122. 1.190 2.8 41111 3 108 ENDDATA 73 0 41111 3 109 ENDSUBENT 108 0 41111 399999 SUBENT 41111004 20221011 420941111 4 1 BIB 7 10 41111 4 2 REACTION ((90-TH-232(N,F),,SIG)/(92-U-235(N,F),,SIG)) 41111 4 3 SAMPLE 232Th (260 ug,232Th content 99.2%+235U content 0.724%),41111 4 4 232Th (425 ug,232Th content 99.6%+235U content 0.359%).41111 4 5 ANALYSIS Normalized at the thermal field (Cd ratio >20) 41111 4 6 DETECTOR (FISCH) Ionization chamber 41111 4 7 ERR-ANALYS (DATA-ERR) Type of uncertainty is not explained in the 41111 4 8 article. 41111 4 9 STATUS (TABLE) Table 2 of J,SJA,71,827,1991 41111 4 10 HISTORY (20221011C) ON+VT . MONIT values were transmitted from 41111 4 11 Subent .002 41111 4 12 ENDBIB 10 0 41111 4 13 NOCOMMON 0 0 41111 4 14 DATA 3 4 41111 4 15 EN DATA DATA-ERR 41111 4 16 MEV NO-DIM NO-DIM 41111 4 17 1.5 0.0679 0.0014 41111 4 18 2.0 0.0992 0.0015 41111 4 19 2.5 0.0989 0.0019 41111 4 20 3.0 0.1199 0.0020 41111 4 21 ENDDATA 6 0 41111 4 22 ENDSUBENT 21 0 41111 499999 SUBENT 41111005 20221011 420941111 5 1 BIB 7 9 41111 5 2 REACTION ((92-U-234(N,F),,SIG)/(92-U-235(N,F),,SIG)) 41111 5 3 SAMPLE 234U (110 ug,234U content 93.3%+235U content 6.70%) 41111 5 4 ANALYSIS Normalized at the thermal field (Cd ratio >20) 41111 5 5 DETECTOR (FISCH) Ionization chamber 41111 5 6 ERR-ANALYS (DATA-ERR) Type of uncertainty is not explained in the 41111 5 7 article. 41111 5 8 STATUS (TABLE) Table 2 of J,SJA,71,827,1991 41111 5 9 HISTORY (20221011C) ON+VT . MONIT values were transmitted from 41111 5 10 Subent .003 41111 5 11 ENDBIB 9 0 41111 5 12 NOCOMMON 0 0 41111 5 13 DATA 3 5 41111 5 14 EN DATA DATA-ERR 41111 5 15 MEV NO-DIM PER-CENT 41111 5 16 1.0 0.912 0.015 41111 5 17 1.5 1.112 0.018 41111 5 18 2.0 1.192 0.018 41111 5 19 2.5 1.191 0.018 41111 5 20 3.0 1.246 0.020 41111 5 21 ENDDATA 7 0 41111 5 22 ENDSUBENT 21 0 41111 599999 ENDENTRY 5 0 4111199999999