ENTRY 22423 20070314 21842242300000001 SUBENT 22423001 20070314 21842242300100001 BIB 16 49 2242300100002 TITLE .Measurement of Fast Neutron-Induced Fission Cross- 2242300100003 Section Ratio of Neptunium-237 relative to Uranium- 2242300100004 235 between 6 and 120 keV 2242300100005 AUTHOR (T.IWASAKI, K.SAITO, M.BABA, T.SANAMI, Y.NAUCHI, 2242300100006 N.HIRAKAWA) 2242300100007 INSTITUTE (2JPNTOH) Department of Quantum Science and Energy 2242300100008 Engineering 2242300100009 REFERENCE (J,NST,36,(2),127,199902) MAIN REFERENCE, DATA GIVEN 2242300100010 (J,NST,24,423,1987) EXPERIMENTAL DETAILS 2242300100011 FACILITY (DYNAM) 4.5 MV Dynamitron accelerator of 2JPNTOH 2242300100012 Proton current was 8 micro-Amp, proton 2242300100013 energy 1.92 MeV, repetition rate 0.5 MHz, 2242300100014 pulse width 2.2 ns 2242300100015 MONITOR (92-U-235(N,F),,SIG,,SPA) monitor value was taken from 2242300100016 JENDL-3.2 evaluated file 2242300100017 INC-SOURCE (P-LI7) 2242300100018 METHOD (TOF) TIME-OF-FLIGHT 2242300100019 ANALYSIS .Because exact energy spectrum is not necessary an 2242300100020 assumption of flat spectrum in each energy bin was 2242300100021 made. Two measurement runs were made, final results 2242300100022 represent arithmetic average of both runs 2242300100023 DETECTOR (FISCH) Coupled back-to-back ionization chamber for 2242300100024 fission rate measurements 2242300100025 (GLASD,BF3) 6Li glass scintillator NE912 detector 2242300100026 AND BF3 COUNTERS were used for measuring 2242300100027 and monitoring of neutron spectrum 2242300100028 INC-SPECT Neutron energy spectrum was divided into five energy 2242300100029 bins with central energy 8.4, 15, 25, 42, 87 keV 2242300100030 CORRECTION .corrections were made for (1) backgrounds by room 2242300100031 returned neutrons, (2) fission events discriminated 2242300100032 in the pulse height spectrum, (3) self-absorption 2242300100033 in the fission sample, (4) fission events by the 2242300100034 neutrons by the chamber and the target 2242300100035 SAMPLE .Both 237Np and 235U samples were thin-layer electro- 2242300100036 deposited on a 0.3 mm thick and 36 mm diameter 2242300100037 platinum plate. Diameter of deposite was 25 mm. 2242300100038 Total 237Np mass was 1.051 mg, purity 99.999%, 2242300100039 nonuniformity 1%. Total 235U mass was 0.406 mg, 2242300100040 U-235 content 99.9%, U-234 content 0.030%, U-236 2242300100041 content 0.017%, U-238 content 0.041%, non-uniformity 2242300100042 4% 2242300100043 ERR-ANALYS (ERR-T) Data-error is not specified, assumed 2242300100044 total by compiler 2242300100045 (ERR-1) Total error of 237Np sample 2242300100046 (ERR-2) Total error of 235U sample 2242300100047 STATUS (TABLE) Data are taken from the table 6 of main 2242300100048 reference 2242300100049 HISTORY (19991129C) + + COMPILED by S.M. + + 2242300100050 (20070314A) Corrected after N.Ohtsuka remark - SM 2242300100051 ENDBIB 49 0 2242300100052 COMMON 2 3 2242300100053 ERR-1 ERR-2 2242300100054 PER-CENT PER-CENT 2242300100055 1.34 0.91 2242300100056 ENDCOMMON 3 0 2242300100057 ENDSUBENT 56 0 2242300199999 SUBENT 22423002 20070314 21842242300200001 BIB 2 3 2242300200002 REACTION 1((93-NP-237(N,F),,SIG,,SPA)/(92-U-235(N,F),,SIG,,SPA)) 2242300200003 2(93-NP-237(N,F),,SIG,,SPA) 2242300200004 HISTORY (20070314A) Data for pointer 2 multiplied by 1/10 2242300200005 ENDBIB 3 0 2242300200006 NOCOMMON 0 0 2242300200007 DATA 5 5 2242300200008 EN-MEAN EN-RSL-FW DATA 1ERR-T 1DATA 2 2242300200009 KEV KEV NO-DIM PER-CENT B 2242300200010 87. 67. 9.8700E-03 7.1 1.6000E-02 2242300200011 42. 23. 9.4400E-03 5.5 1.8000E-02 2242300200012 25. 10. 8.0500E-03 7.0 1.7000E-02 2242300200013 15. 10. 7.6000E-03 8.2 1.9000E-02 2242300200014 8.4 3.6 7.0700E-03 1.7000E+1 2.1000E-02 2242300200015 ENDDATA 7 0 2242300200016 ENDSUBENT 15 0 2242300299999 ENDENTRY 2 0 2242399999999