ENTRY 40835 20240809 4083500000001 SUBENT 40835001 20240809 20250110 4083500100001 BIB 11 27 4083500100002 TITLE Measurement of the 237Np7 and 235U fission 4083500100003 cross-section ratio by the isotopic dilution method 4083500100004 AUTHOR (A.A.Goverdovskij, A.K.Gordyushin, B.D.Kuz'minov, 4083500100005 V.F.Mitrofanov, A.I.Sergachev, S.M.Solov'ev, 4083500100006 P.S.Soloshenkov) 4083500100007 INSTITUTE (4RUSFEI) 4083500100008 REFERENCE (R,INDC(CCP)-281,17,1988) 4083500100009 English translation of J,YK,,(3/57),13,1984 4083500100010 ((J,YK,,(3/57),13,1984)=(R,INDC(CCP)-240,13,1984)) 4083500100011 REL-REF (M,,A.A.Goverdovskij+,C,83KIEV,4,115,1983) 4083500100012 =(R,INDC(CCP)-235,4,115) 4083500100013 Details of method and corrections in Russian. 4083500100014 DETECTOR (IOCH) Double ionization chamber. 4083500100015 Registration efficiency for Np-237 91%, for U-235 98% 4083500100016 METHOD Isotopic dilution method 4083500100017 CORRECTION Corrected for fission fragment transmission (0.2-0.5%) 4083500100018 ERR-ANALYS (ERR-T) Total error (~2.5%) 4083500100019 (ERR-S,0.3,1.0) statistical error (0.3-1.0%) 4083500100020 (ERR-1,,1.2) 237Np/235U efficiency ratio (<1.2%) 4083500100021 (ERR-2) corrections (0.2%) 4083500100022 (ERR-3) isotopic composition (1%) 4083500100023 STATUS (APRVD) Gordyushin 1984-12 4083500100024 HISTORY (19850219C) 4083500100025 (20130225A) M.M. Upper -> lower case correction. 4083500100026 Dates were corrected for 4-digits year. 4083500100027 BIB information was updated. 4083500100028 (20240809A) On. ERR-ANALYS and COMMON section updated. 4083500100029 ENDBIB 27 0 4083500100030 COMMON 2 3 4083500100031 ERR-2 ERR-3 4083500100032 PER-CENT PER-CENT 4083500100033 0.2 1. 4083500100034 ENDCOMMON 3 0 4083500100035 ENDSUBENT 34 0 4083500199999 SUBENT 40835002 20240809 20250110 4083500200001 BIB 6 8 4083500200002 REACTION ((93-NP-237(N,F),,SIG)/(92-U-235(N,F),,SIG)) 4083500200003 FACILITY (VDGT) EGP-10M tandem generator 4083500200004 INC-SOURCE (D-D) Gas deuterium target 4083500200005 SAMPLE Sample #1 U-235/Np-237 = 3.46%/96.54%, 300 ug/cm2 4083500200006 Sample #7 U-235 = 99.992%, 258 ug/cm2 4083500200007 STATUS (TABLE,,A.A.Goverdovskij+,R,INDC(CCP)-281,17,1988) 4083500200008 Text in page 21 4083500200009 HISTORY (20240809U) On. FACILITY, SAMPLE and STATUS updated. 4083500200010 ENDBIB 8 0 4083500200011 NOCOMMON 0 0 4083500200012 DATA 3 1 4083500200013 EN DATA ERR-T 4083500200014 MEV NO-DIM NO-DIM 4083500200015 7.34 1.246 0.030 4083500200016 ENDDATA 3 0 4083500200017 ENDSUBENT 16 0 4083500299999 SUBENT 40835003 20240809 20250110 4083500300001 BIB 7 28 4083500300002 REACTION ((93-NP-237(N,F),,SIG)/(92-U-235(N,F),,SIG)) 4083500300003 FACILITY (VDG) Cascade generator 4083500300004 INC-SOURCE (D-T) Solid T-Ti target 4083500300005 SAMPLE Sample #1 U-235/Np-237 = 3.46%/96.54%, 300 ug/cm2 4083500300006 Sample #2 U-235/Np-237 = 4.40%/95.60%, 300 ug/cm2 4083500300007 Sample #3 U-235/Np-237 = 6.50%/93.50%, 300 ug/cm2 4083500300008 Sample #4 U-235/Np-237 = 18.26%/81.74%, 106 ug/cm2 4083500300009 Sample #5 U-235/Np-237 = 24.65%/75.35%, 100 ug/cm2 4083500300010 Sample #6 U-235/Np-237 = 34.75%/65.25%, 98 ug/cm2 4083500300011 Sample #7 U-235 = 99.992%, 258 ug/cm2 4083500300012 Sample #8 Np-237/Am-241/Pu-239 4083500300013 = 99.05%/0.52%/0.43%, 460 ug/cm2 4083500300014 Sample #9 U-235 = 99.992%, 419 ug/cm2 4083500300015 ANALYSIS .Samples 8 and 9 were used to determine effective ratio4083500300016 of sample nuclei numbers - Kef. 4083500300017 Value of Kef was determined as average for six samples:4083500300018 Sample # SIG(Np-237)/SIG(U-235) Kef 4083500300019 1 1.056 1.354 4083500300020 2 1.044 1.339 4083500300021 3 1.062 1.361 4083500300022 4 1.070 1.372 4083500300023 5 1.048 1.344 4083500300024 6 1.038 1.331 4083500300025 STATUS (TABLE,,A.A.Goverdovskij+,R,INDC(CCP)-281,17,1988) 4083500300026 Text in page 21 4083500300027 HISTORY (20240809U) On. SAMPLE and STATUS updated. 4083500300028 (20240810U) M.M. Sample #9 was added. 4083500300029 ANALYSIS was added. 4083500300030 ENDBIB 28 0 4083500300031 NOCOMMON 0 0 4083500300032 DATA 3 1 4083500300033 EN DATA ERR-T 4083500300034 MEV NO-DIM NO-DIM 4083500300035 16.4 1.049 0.024 4083500300036 ENDDATA 3 0 4083500300037 ENDSUBENT 36 0 4083500399999 ENDENTRY 3 0 4083599999999