ENTRY 41349 20091030 41484134900000001 SUBENT 41349001 20091030 41484134900100001 BIB 12 30 4134900100002 TITLE An improved experimental facility for studying of 4134900100003 delayed neutrons and preliminary results of the 4134900100004 Beta-Eff value for U-233 relative to U-235. 4134900100005 AUTHOR (S.B.Borzakov, E.Dermendjiev, V.M.Nazarov, S.S.Pavlov, 4134900100006 Iv.Ruskov, Yu.S.Zamyatmin) 4134900100007 INSTITUTE (4ZZZDUB) Frank Lab of Neutron Physics 4134900100008 REFERENCE ((S,ISINN-2,192,1994)=(S,JINR-E3-94-419,192,1994)) 4134900100009 FACILITY (REAC) IBR-2 Pulse Fast Reactor, pulse frequency is 4134900100010 5 Hz, pulse width 215 microsec 4134900100011 (CHOPS) Slow Chopper in connection with IBR-2 Reactor 4134900100012 MONITOR ((MONIT)(92-U-235(N,F),DL,NU,,SPA)/ 4134900100013 (92-U-235(N,F),PR,NU,,SPA)) 4134900100014 MONIT-REF ((MONIT),J.Blachot+,R,NEACRP-L-323,1990) OECD-NEA, 4134900100015 NEACRP-L-323,1990 4134900100016 DETECTOR (PROPC) Battery of 12 He-3 counters. 4134900100017 Neutron detection efficiency about 12 %. 4134900100018 INC-SOURCE -A Bent Down Mirror Neutron Guide 4134900100019 INC-SPECT -Bent Down Mirror Guide Transmits Neutrons with Energy 4134900100020 Less Than 0.1 eV. Mean thermal neutron flux at target 4134900100021 2.E+5 n/cm**2/sec. 4134900100022 Background was measured by Cd filter in the beam. 4134900100023 ERR-ANALYS (ERR-SYS) Systematic Error. 4134900100024 (ERR-S,,1.) Stat. error is several times less (< 1.% ) 4134900100025 HISTORY (20000209C) + + Compiled at the Centre - CJD + + 4134900100026 (20000209U) Last checking has been done. 4134900100027 (20091030A) M.M. MONITOR was corrected: 4134900100028 (92-U-235(N,F),PR,NU,,SPA) -> 4134900100029 (92-U-235(N,F),DL,NU,,SPA)/(92-U-235(N,F),PR,NU,,SPA).4134900100030 BIB information was added. 4134900100031 DATA-ERR -> ERR-SYS. 4134900100032 ENDBIB 30 0 4134900100033 NOCOMMON 0 0 4134900100034 ENDSUBENT 33 0 4134900199999 SUBENT 41349002 20091030 41484134900200001 BIB 4 12 4134900200002 REACTION ((92-U-233(N,F),DL,NU,,SPA)/(92-U-233(N,F),PR,NU,,SPA))4134900200003 Average for neutrons of energy less EN-MAX. 4134900200004 SAMPLE -233-U metallic sample has weight 0.1 g, enrichment 4134900200005 98.11%, thickness 2.7e+19 nucl/cm**2. 4134900200006 -235-U samples have weights 7 and 0.3 g, enrichment 4134900200007 90%, thicknesses 2.7e+21 and 8.e+19 nucl/cm**2 . 4134900200008 STATUS (TABLE) Data from the Text S,ISINN-2,192,1994,page 197.4134900200009 (PRELM) Classified by authors as preliminary 4134900200010 HISTORY (20091030A) M.M. REACTION was changed: 4134900200011 (92-U-233(N,F),DL,NU,,SPA) -> 4134900200012 (92-U-233(N,F),DL,NU,,SPA)/(92-U-233(N,F),PR,NU,,SPA).4134900200013 Units were corrected: PART/FIS -> NO-DIM . 4134900200014 ENDBIB 12 0 4134900200015 NOCOMMON 0 0 4134900200016 DATA 5 1 4134900200017 EN-MAX DATA ERR-SYS MONIT MONIT-ERR 4134900200018 EV NO-DIM NO-DIM NO-DIM NO-DIM 4134900200019 0.1 0.0029 0.0002 0.0068 0.0002 4134900200020 ENDDATA 3 0 4134900200021 ENDSUBENT 20 0 4134900299999 ENDENTRY 2 0 4134999999999