ENTRY 41192 20110719 41534119200000001 SUBENT 41192001 20110719 41534119200100001 BIB 13 41 4119200100002 TITLE Apparatus for studying delayed neutrons and preliminary4119200100003 results of the determination of beta-eff for U-233 with4119200100004 respect to U-235 . 4119200100005 AUTHOR (S.B.Borzakov,E.Dermenjiev,Yu.S.Zamyatnin,V.M.Nazarov, 4119200100006 S.S.Pavlov,A.D.Rogov,I.Ruskov) 4119200100007 INSTITUTE (4ZZZDUB) 4119200100008 REFERENCE (J,AE,79,(3),231,199509) Data are given 4119200100009 (J,AE/T,79,(3),637,1995) Engl.translation of J,AE,79 . 4119200100010 REL-REF (I,,E.Dermendjiev+,P,JINR-E3-6,1993) 4119200100011 Details of neutron detector and electronics. 4119200100012 FACILITY (REAC,4ZZZDUB) Fast pulse reactor IBR-2 4119200100013 Setup "ISOMER". 4119200100014 (CHOPS) Slow chopper at 30 m distance from reactor. 4119200100015 METHOD (ACTIV) Cyclic activation: activation time 10-50 msec, 4119200100016 measurement time about 150 msec - each cycle. 4119200100017 (FISCT) 4119200100018 DETECTOR (PROPC) Battery of 12 prop.counters placed in 4119200100019 polyethylene. Covered by Cd and borated polyethylene. 4119200100020 Detector efficiency was calculated by MCNP code to be 4119200100021 20% at 2 MeV and about 1.5 times less at 0.1 MeV. 4119200100022 INC-SOURCE (REAC) Mirror neutron guide. Slow chopper at 30 m 4119200100023 distance from reactor. 4119200100024 INC-SPECT Thermal neutron beam at sample position 4119200100025 2.E+5 /sec/cm**2. 4119200100026 CORRECTION Background was measured by Cd filter, 12 for U-235, 4119200100027 37 % for U-233. 4119200100028 ERR-ANALYS (DATA-ERR) Errors are not specified 4119200100029 HISTORY (19960328C) + + Compiled at the centre - CJD + + 4119200100030 (20110715A) M.M. Upper -> lower case correction. 4119200100031 Dates were corrected for 4-digits year. 4119200100032 BIB information was added. 4119200100033 Ref. J,SJA was added. 4119200100034 In REACTION denominator F),PR,NU) -> F),,NU) 4119200100035 because BETA-ef= NU(delayed neutrons)/NU(total) - 4119200100036 according to information and formula on page 231 of 4119200100037 J,AE,79,(3),231,1995 . 4119200100038 DATA-ERR 1, DATA-ERR 2 in Subent 002 were corrected 4119200100039 1.4E-3 -> 1.4E-4 as given in Table of 4119200100040 J,AE,79,(3),231,1995. 4119200100041 In Subent 004 DATA was corrected 2.7E-3 -> 2.9E-3 , 4119200100042 DATA-ERR 1.E-4 -> 2.E-4 as given in text. 4119200100043 ENDBIB 41 0 4119200100044 NOCOMMON 0 0 4119200100045 ENDSUBENT 44 0 4119200199999 SUBENT 41192002 20110719 41534119200200001 BIB 5 8 4119200200002 REACTION ((92-U-235(N,F),DL,NU)/(92-U-235(N,F),,NU)) 4119200200003 SAMPLE 1 Metallic disk 50-80 mm in diameter, mass 7 gram 4119200200004 2 Metallic disk 50-80 mm in diameter, mass 0.3 gram 4119200200005 ANALYSIS Ratio of registration efficiencies of delayed to 4119200200006 prompt neutron = 1.42+-0.02 was used. 4119200200007 FLAG (1.) Measured by sample 1. 4119200200008 (2.) Measured by sample 2. 4119200200009 STATUS (TABLE) Table of J,AE,79,(3),231,1995. 4119200200010 ENDBIB 8 0 4119200200011 COMMON 1 3 4119200200012 EN 4119200200013 EV 4119200200014 2.5E-02 4119200200015 ENDCOMMON 3 0 4119200200016 DATA 3 2 4119200200017 DATA DATA-ERR FLAG 4119200200018 NO-DIM NO-DIM NO-DIM 4119200200019 6.50E-3 1.4E-4 1. 4119200200020 6.47E-3 1.4E-4 2. 4119200200021 ENDDATA 4 0 4119200200022 ENDSUBENT 21 0 4119200299999 SUBENT 41192003 20110719 41534119200300001 BIB 4 6 4119200300002 REACTION ((92-U-233(N,F),DL,NU)/(92-U-233(N,F),,NU)) 4119200300003 SAMPLE Metallic disk 50-80 mm in diameter, mass 7 gram, 4119200300004 U-235 admixture less then 0.2 %. 4119200300005 ANALYSIS Ratio of registration efficiencies of delayed to 4119200300006 prompt neutron = 1.42+-0.02 was used. 4119200300007 STATUS (TABLE) Table of J,AE,79,(3),231,1995. 4119200300008 ENDBIB 6 0 4119200300009 NOCOMMON 0 0 4119200300010 DATA 3 1 4119200300011 EN DATA DATA-ERR 4119200300012 EV NO-DIM NO-DIM 4119200300013 2.5E-02 2.77E-3 7. E-5 4119200300014 ENDDATA 3 0 4119200300015 ENDSUBENT 14 0 4119200399999 SUBENT 41192004 20110719 41534119200400001 BIB 5 12 4119200400002 REACTION ((92-U-233(N,F),DL,NU)/(92-U-233(N,F),,NU)) 4119200400003 ASSUMED (ASSUM,(92-U-235(N,F),DL,NU)/(92-U-235(N,F),,NU)) 4119200400004 From REL-REF of J.Blachot+. 4119200400005 REL-REF (R,,J.Blachot+,R,NEACRP-L-323,1990) 4119200400006 (A,,E.Dermenjiev+,P,JINR-E3-7,1993) 4119200400007 Agree with value 0.0027+-0.0001 of E.Dermenjiev+. 4119200400008 ANALYSIS Using ASSUM value of BETA-ef from REL-REF, the ratio 4119200400009 of registration efficiencies of delayed to prompt 4119200400010 neutron was determined to be EPS-DN/EPS-PN=1.36 +-0.06,4119200400011 what is in reasonable agreement with calculated. 4119200400012 BETA-ef was determined using this exp. ratio 1.36+-0.6.4119200400013 STATUS (TABLE) Text, page 232 of J,AE,79,(3),231,1995. 4119200400014 ENDBIB 12 0 4119200400015 COMMON 2 3 4119200400016 ASSUM ASSUM-ERR 4119200400017 NO-DIM NO-DIM 4119200400018 0.0068 0.0002 4119200400019 ENDCOMMON 3 0 4119200400020 DATA 3 1 4119200400021 EN DATA DATA-ERR 4119200400022 EV NO-DIM NO-DIM 4119200400023 2.5E-02 2.9 E-3 2. E-4 4119200400024 ENDDATA 3 0 4119200400025 ENDSUBENT 24 0 4119200499999 ENDENTRY 4 0 4119299999999