ENTRY 40861 20240617 421740861000 1 SUBENT 40861001 20240617 421740861001 1 BIB 11 35 40861001 2 TITLE Measurement of the ratio of the cross sections for 40861001 3 fissioning of 237Np and 235U by neutrons with 40861001 4 energies in the range 4-11 MeV 40861001 5 AUTHOR (A.A.Goverdovskii, A.K.Gordyushin, B.D.Kuz'minow, 40861001 6 V.F.Mitrofanov, A.I.Sergachev, S.M.Solov'ev, 40861001 7 G.M.Stepchenkova) 40861001 8 REFERENCE (J,SJA,58,163,1985) 40861001 9 #doi:10.1007/BF01122211 40861001 10 (J,AE,58,137,1985) Russian original of SJA,58,163,1985 40861001 11 INSTITUTE (4RUSFEI) 40861001 12 FACILITY (VDGT,4RUSFEI) EGP-10M 40861001 13 INC-SOURCE (D-D) Gas target (1.2E+5 Pa) irradiated by deuteron 40861001 14 beam (1.5 microA) 40861001 15 INC-SPECT Background neutrons due to d(d,np)d above En > 5 MeV, 40861001 16 which have a continuous spectrum with average energy 40861001 17 about 3 MeV and the intensity comparative with 40861001 18 monoenergetic portion at En > 8.5 MeV. 40861001 19 DETECTOR (FISCH) Double ionization chamber (1.8E+5 Pa) 40861001 20 (SCIN) For neutron flux monitoring 40861001 21 CORRECTION Corrected for 40861001 22 . neutrons scattered by target holder, ionization 40861001 23 detector and substrates of layers (<0.04%)40861001 24 . impurity nuclide fission (0.11-0.30% at En>10 MeV)40861001 25 . fission fragments stopped in layers (0.06-0.12%)40861001 26 . nonhomogeneity of 235U and 237Np mixture (0.12-0.4%)40861001 27 STATUS (APRVD) Under question 40861001 28 HISTORY (19850517C) 40861001 29 (20130822A) M.M. Upper -> lower case correction. 40861001 30 Dates were corrected for 4-digits year. 40861001 31 Reference of Engl.translation was added. 40861001 32 BIB information was updated. 40861001 33 ERR-ANALYS in Subent 004 was corrected according to 40861001 34 now-days rules. 40861001 35 (20240305A) VT. Major revision in 002-004. 40861001 36 (20240617U) M.M. Minor correction of BIB information. 40861001 37 ENDBIB 35 0 40861001 38 NOCOMMON 0 0 40861001 39 ENDSUBENT 38 0 4086100199999 SUBENT 40861002 20240617 421740861002 1 BIB 6 22 40861002 2 REACTION ((93-NP-237(N,F),,SIG)/(92-U-235(N,F),,SIG)) 40861002 3 MONITOR Absolute measurement (isotopic dilution method) 40861002 4 SAMPLE Nuclide content (%): 40861002 5 -------------------------------------------------- 40861002 6 Sample 235U 237Np Thickness (ug/cm2) 40861002 7 -------------------------------------------------- 40861002 8 3. 3.46 96.54 300 40861002 9 4. 4.40 95.60 300 40861002 10 5. 6.50 93.50 300 40861002 11 6. 18.26 81.74 300 40861002 12 7. 24.65 75.35 100 40861002 13 8. 34.75 65.25 98 40861002 14 9. 5.19 94.81 204 40861002 15 -------------------------------------------------- 40861002 16 Isotopic purity is 99.9% for Samples 3-8 while 40861002 17 mixture of 238U and 235U for Sample 9. 40861002 18 MISC-COL (MISC) Sample thickness 40861002 19 STATUS (TABLE,,A.A.Goverdovskii+,J,AE,58,137,1985) Table 1 40861002 20 HISTORY (20130822A) M.M. THICKNESS -> MISC was corrected 40861002 21 according to opinion of N.Otsuka (NDS,IAEA). 40861002 22 (20240305A) VT. DATA: replaced the floating point to a 40861002 23 fixed point. 40861002 24 ENDBIB 22 0 40861002 25 NOCOMMON 0 0 40861002 26 DATA 3 28 40861002 27 EN DATA MISC 40861002 28 MEV NO-DIM G/CM-SQ 40861002 29 6.55 1.335 98.E-06 40861002 30 6.55 1.300 100.E-06 40861002 31 6.55 1.330 204.E-06 40861002 32 6.55 1.320 300.E-06 40861002 33 6.55 1.328 300.E-06 40861002 34 6.55 1.312 300.E-06 40861002 35 6.55 1.310 306.E-06 40861002 36 6.95 1.270 98.E-06 40861002 37 6.95 1.262 100.E-06 40861002 38 6.95 1.286 204.E-06 40861002 39 6.95 1.260 300.E-06 40861002 40 6.95 1.242 300.E-06 40861002 41 6.95 1.272 300.E-06 40861002 42 6.95 1.250 306.E-06 40861002 43 7.34 1.174 98.E-06 40861002 44 7.34 1.180 100.E-06 40861002 45 7.34 1.209 204.E-06 40861002 46 7.34 1.190 300.E-06 40861002 47 7.34 1.230 300.E-06 40861002 48 7.34 1.226 300.E-06 40861002 49 7.34 1.232 306.E-06 40861002 50 7.75 1.176 98.E-06 40861002 51 7.75 1.221 100.E-06 40861002 52 7.75 1.195 204.E-06 40861002 53 7.75 1.175 300.E-06 40861002 54 7.75 1.200 300.E-06 40861002 55 7.75 1.189 300.E-06 40861002 56 7.75 1.209 306.E-06 40861002 57 ENDDATA 30 0 40861002 58 ENDSUBENT 57 0 4086100299999 SUBENT 40861003 20240617 421740861003 1 BIB 5 10 40861003 2 REACTION ((93-NP-237(N,F),,SIG)/(92-U-235(N,F),,SIG)) 40861003 3 ANALYSIS Average of data measured with several samples 40861003 4 given in Subent 002. 40861003 5 ERR-ANALYS (ERR-1) Isotopic composition 40861003 6 (ERR-2) 237Np/235U detection efficiency ratio 40861003 7 (ERR-T) Total uncertainty 40861003 8 STATUS (TABLE,,A.A.Goverdovskii+,J,AE,58,137,1985) Table 1 40861003 9 (DEP,40861002) Data for each sample 40861003 10 HISTORY (20240305A) VT. 40861003 11 DATA: replaced the floating point to a fixed point. 40861003 12 ENDBIB 10 0 40861003 13 COMMON 2 3 40861003 14 ERR-1 ERR-2 40861003 15 PER-CENT PER-CENT 40861003 16 1. 0.4 40861003 17 ENDCOMMON 3 0 40861003 18 DATA 3 4 40861003 19 EN DATA ERR-T 40861003 20 MEV NO-DIM NO-DIM 40861003 21 6.55 1.319 0.016 40861003 22 6.95 1.263 0.015 40861003 23 7.34 1.206 0.015 40861003 24 7.75 1.195 0.014 40861003 25 ENDDATA 6 0 40861003 26 ENDSUBENT 25 0 4086100399999 SUBENT 40861004 20240617 421740861004 1 BIB 7 23 40861004 2 REACTION ((93-NP-237(N,F),,SIG)/(92-U-235(N,F),,SIG)) 40861004 3 SAMPLE Nuclide content (%): 40861004 4 -------------------------------------------------- 40861004 5 Sample 235U 237Np Thickness (ug/cm2) 40861004 6 -------------------------------------------------- 40861004 7 1. 99.992 410; 256 40861004 8 2. 99.05 460 40861004 9 -------------------------------------------------- 40861004 10 ANALYSIS Normalized to absolutely measured data 40861004 11 FLAG (1.) Normalizing points 40861004 12 ERR-ANALYS (ERR-S) Statistical uncertainty (0.8-1.1%) 40861004 13 (ERR-1,0.3,0.6) 237Np/235U detection efficiency ratio40861004 14 (ERR-2) Normalization 40861004 15 (ERR-3,,0.1) Corrections 40861004 16 (ERR-4,0.10,0.45) Background subtraction above 8 MeV 40861004 17 (ERR-T) Total uncertainty 40861004 18 STATUS (TABLE,,A.A.Goverdovskii+,J,AE,58,137,1985) Table 2 40861004 19 (DEP,40861003) Data from absolute measurements 40861004 20 . In 40833.002 - preliminary data of first run, 40861004 21 superseded by 40861.004. 40861004 22 HISTORY (20240305A) VT. DATA: 81->78, 1.213->1.206, 1.10->0.83 40861004 23 and 1.45->1.24 at 7.34 MeV. Replaced the floating point40861004 24 to a fixed point. 40861004 25 ENDBIB 23 0 40861004 26 COMMON 1 3 40861004 27 ERR-2 40861004 28 PER-CENT 40861004 29 0.85 40861004 30 ENDCOMMON 3 0 40861004 31 DATA 6 35 40861004 32 EN EN-RSL-FW DATA ERR-S ERR-T FLAG 40861004 33 MEV KEV NO-DIM PER-CENT PER-CENT NO-DIM 40861004 34 4.44 150. 1.363 1.00 1.37 40861004 35 4.97 130. 1.420 0.92 1.32 40861004 36 5.21 123. 1.416 0.94 1.33 40861004 37 5.44 120. 1.449 1.05 1.41 40861004 38 5.66 116. 1.458 1.07 1.43 40861004 39 5.88 109. 1.481 0.93 1.32 40861004 40 6.11 102. 1.434 0.89 1.30 40861004 41 6.14 102. 1.409 1.11 1.46 40861004 42 6.35 98. 1.361 1.07 1.43 40861004 43 6.38 96. 1.365 0.95 1.34 40861004 44 6.55 92. 1.319 0.45 1.21 1. 40861004 45 6.75 88. 1.262 1.16 1.50 40861004 46 6.95 84. 1.263 0.48 1.19 1. 40861004 47 7.15 81. 1.213 1.10 1.45 40861004 48 7.34 78. 1.206 0.83 1.24 1. 40861004 49 7.53 75. 1.198 1.21 1.53 40861004 50 7.75 73. 1.195 0.54 1.17 1. 40861004 51 7.94 70. 1.172 1.08 1.43 40861004 52 8.12 68. 1.169 1.00 1.37 40861004 53 8.31 66. 1.172 1.12 1.48 40861004 54 8.50 64. 1.159 0.89 1.30 40861004 55 8.66 63. 1.154 0.90 1.33 40861004 56 8.82 62. 1.163 0.78 1.25 40861004 57 9.01 60. 1.145 0.86 1.34 40861004 58 9.18 59. 1.142 0.99 1.42 40861004 59 9.35 58. 1.126 0.90 1.34 40861004 60 9.51 56. 1.127 1.08 1.49 40861004 61 9.65 55. 1.123 1.00 1.42 40861004 62 9.82 54. 1.129 1.10 1.50 40861004 63 9.96 53. 1.120 1.12 1.55 40861004 64 10.11 53. 1.115 1.00 1.47 40861004 65 10.22 52. 1.125 0.90 1.40 40861004 66 10.36 52. 1.132 1.05 1.50 40861004 67 10.49 50. 1.120 1.15 1.57 40861004 68 10.69 50. 1.127 1.20 1.61 40861004 69 ENDDATA 37 0 40861004 70 ENDSUBENT 69 0 4086100499999 ENDENTRY 4 0 4086199999999