ENTRY 40833 20240617 421740833000 1 SUBENT 40833001 20240617 421740833001 1 BIB 11 31 40833001 2 TITLE Cross section for fission of 237Np induced by neutrons 40833001 3 in the (n,n'f) threshold region 40833001 4 AUTHOR (A.A.Goverdovskiy, A.K.Gordyushin, B.D.Kuz'minov, 40833001 5 V.F.Mitrovanov, A.I.Sergachev, S.M.Solov'ev, 40833001 6 P.S.Soloshenkov) 40833001 7 REFERENCE (R,FEI-1552,1984) 40833001 8 INSTITUTE (4RUSFEI) 40833001 9 FACILITY (VDGT,4RUSFEI) EGP-10M 40833001 10 INC-SOURCE (D-D) Gaseous deuterium target. 40833001 11 METHOD (TOF) Flight base 60 cm 40833001 12 DETECTOR (FISCH) Double ionization chamber. Filled with methane 40833001 13 at 1.8 atm pressure. Fission detection efficiency 40833001 14 96 % for Np, 98 % for U. 40833001 15 CORRECTION Corrected for 40833001 16 . background neutron scattering (<0.2%) 40833001 17 . fragments slowing-down in sample (<0.5%) 40833001 18 . admixture isotopes fission (0.2-0.3%) 40833001 19 . experimental hall background (<0.15%) 40833001 20 . geometry in Monte Carlo method (<0.1%) 40833001 21 ERR-ANALYS (ERR-T) Total uncertainty 40833001 22 (ERR-S) statistical uncertainty 40833001 23 (ERR-1) normalization (~2%) 40833001 24 (ERR-2) 237Np/235U detection efficiency ratio (1.2%) 40833001 25 (ERR-3) corrections (0.2%) 40833001 26 HISTORY (19850218C) 40833001 27 (20231226A) ERR-S was deleted from COMMON block - it's 40833001 28 given in DATA block. 40833001 29 Upper -> lower case correction. 40833001 30 Dates were corrected for 4-digits year. 40833001 31 (20240308A) VT. Revision in 002. BIB section updated. 40833001 32 (20240617U) M.M. Minor correction of BIB information. 40833001 33 ENDBIB 31 0 40833001 34 COMMON 3 3 40833001 35 ERR-1 ERR-2 ERR-3 40833001 36 PER-CENT PER-CENT PER-CENT 40833001 37 2. 1.2 0.2 40833001 38 ENDCOMMON 3 0 40833001 39 ENDSUBENT 38 0 4083300199999 SUBENT 40833002 20240617 421740833002 1 BIB 5 19 40833002 2 REACTION ((93-NP-237(N,F),,SIG)/(92-U-235(N,F),,SIG)) 40833002 3 MONITOR Absolute measurement (isotopic dilution method) 40833002 4 SAMPLE Layers of 50 mm diameter on Al backings of 20 micron 40833002 5 thickness. 40833002 6 Nuclide content (%): 40833002 7 --------------------------------------------------- 40833002 8 Sample 235U 237Np Thickness (mg/cm2) 40833002 9 --------------------------------------------------- 40833002 10 1. 99.992 0.258 40833002 11 2. 5.889 94.111 0.300 40833002 12 3. 99.994 0.41 40833002 13 4. 99.05 0.46 40833002 14 ---------------------------------------------------- 40833002 15 STATUS (TABLE,,A.A.Goverdovskij+,R,FEI-1552,1984) Table 2 40833002 16 (PRELM) 40833002 17 (SPSDD,40861004) 40833002 18 HISTORY (20240617A) Code SPSDD was added - in 40861 data from 40833002 19 FEI-1552 are not mentioned and are not used on figure 40833002 20 fro comparison with other data. 40833002 21 ENDBIB 19 0 40833002 22 NOCOMMON 0 0 40833002 23 DATA 5 16 40833002 24 EN EN-RSL-FW DATA ERR-T ERR-S 40833002 25 MEV KEV NO-DIM PER-CENT PER-CENT 40833002 26 5.66 116. 1.315 3.38 0.7 40833002 27 5.88 108. 1.331 2.40 0.8 40833002 28 6.10 103. 1.395 2.45 1.0 40833002 29 6.32 97. 1.349 2.42 0.9 40833002 30 6.50 93. 1.330 2.42 0.9 40833002 31 6.68 89. 1.312 2.42 0.9 40833002 32 7.34 78. 1.232 1.75 0.6 40833002 33 7.96 70. 1.161 2.45 1.0 40833002 34 8.10 68. 1.151 2.45 1.0 40833002 35 8.39 65. 1.177 2.44 1.0 40833002 36 8.64 63. 1.157 2.46 0.8 40833002 37 8.78 62. 1.170 2.47 0.9 40833002 38 9.03 60. 1.150 2.45 1.0 40833002 39 9.17 59. 1.150 2.52 1.0 40833002 40 9.44 57. 1.135 2.50 1.1 40833002 41 10.06 53. 1.123 2.50 1.1 40833002 42 ENDDATA 18 0 40833002 43 ENDSUBENT 42 0 4083300299999 ENDENTRY 2 0 4083399999999