ENTRY 40264 20220204 42044026400000001 SUBENT 40264001 20220204 42044026400100001 BIB 15 57 4026400100002 TITLE Determining the mean number of neutrons per fission 4026400100003 event for 252Cf 4026400100004 AUTHOR (B.L.Aleksandrov,L.M.Belov,Ya.M.Kramarovskij, 4026400100005 K.A.Petrzhak,A.G.Prusakov,E.A.Shlyamin,O.A.Migun'kov, 4026400100006 G.M.Stukov,V.T.Shchebolev,I.A.Yaritsyna) 4026400100007 REFERENCE (C,73KIEV,4,76,1973) Preliminary data are given 4026400100008 There is no Engl.translation for 73KIEV as INDC(CCP). 4026400100009 (R,YFI-17,34,1974) Exp. details only. 4026400100010 (R,INDC(CCP)-48,35,1975) 4026400100011 Engl.translation of YFI-17,34,1974. 4026400100012 INSTITUTE (4RUSRI) 4026400100013 (4RUSMIM) Measurement in Mendeleev's Metrology Res.Inst4026400100014 EXP-YEAR (1972) 4026400100015 METHOD Separate definition method of the target neutron 4026400100016 yield and of the fissions velocity in it was used. 4026400100017 Neutron yield was measured by three methods : 4026400100018 In carbon sphere calibrated by 4026400100019 associated particles of T(d,n)alpha reaction. 4026400100020 (ACTIV) By method of gold activation in water tank 4026400100021 (MANGB) By method of manganese bath of 85 cm diameter,4026400100022 95 cm high. 4026400100023 MONITOR No information 4026400100024 DETECTOR (SIBAR) Chamber with silicon surface-barrier 4026400100025 detector - for fission fragments registration. 4026400100026 SAMPLE Two Cf-252 of 0.383 and 0.909 microg sources were made4026400100027 by thermospraying and electrolysis, respectively. 4026400100028 PART-DET (FF) Fission fragments were registered at 4026400100029 determination of fissions rate. 4026400100030 CORRECTION For low-energy "tail" extrapolation. 4026400100031 No correction for FF scattering on backing . 4026400100032 For Cf source self-scattering. 4026400100033 For Cf source diameter increasing - 0.5% . 4026400100034 ERR-ANALYS (ERR-T) Total error ~1.3 %. 4026400100035 Total uncertainty of reaction rate (~0.7%) includes: 4026400100036 (ERR-S) Statistical error. 4026400100037 (ERR-1) Uncertainty of extrapolation of energy 4026400100038 spectrum "tail". 4026400100039 (ERR-2) Uncertainty of self-scattering of Cf source. 4026400100040 (ERR-3) Determination of solid angle. 4026400100041 (ERR-4) Raveling out of active spot. 4026400100042 COMMENT Of compiler M.M. 4026400100043 In C,75KIEV,5,166,1975 ( next publication of authors) 4026400100044 it's mentioned for experiment of this Entry 40264 : 4026400100045 weighting-average error of neutron yield as 0.9 %, 4026400100046 0.7% - error of fission rate measurement 4026400100047 STATUS (PRELM) Preliminary data from C,73KIEV,4,76,7306 4026400100048 HISTORY (19750107C) Compiled at the centre 4026400100049 (19881116U) Several errors corrected 4026400100050 NUC-QUANT into REACTION converted 4026400100051 DATA-ERR into ERR-T changed. Three 4026400100052 names corrected (Kramarovskiy,Shlyamin,Yarutsina)4026400100053 (20130315A) M.M. Upper -> lower case correction. 4026400100054 Dates were corrected for 4-digits year. 4026400100055 Units were corrected NO-DIM -> PRT/FIS . 4026400100056 BIB information was updated. Errors values were added. 4026400100057 (20220204U) Ref.INDC(CCP)-48,35,1975 was added. 4026400100058 Minor correction of free text. 4026400100059 ENDBIB 57 0 4026400100060 COMMON 5 3 4026400100061 ERR-S ERR-1 ERR-2 ERR-3 ERR-4 4026400100062 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 4026400100063 0.2 0.2 0.5 0.2 0.3 4026400100064 ENDCOMMON 3 0 4026400100065 ENDSUBENT 64 0 4026400199999 SUBENT 40264002 20220204 42044026400200001 BIB 4 7 4026400200002 REACTION (98-CF-252(0,F),,NU) 4026400200003 DECAY-DATA (98-CF-252,2.621YR) From: 4026400200004 REL-REF (R,,A.De Volpi+,J,INC,5,699,1969) 4026400200005 STATUS (TABLE) Text, pages 76, 81 of 4026400200006 Conf.Proc.73KIEV,v.4,p.76,1973 . 4026400200007 (SPSDD,40458002) In 40458 - new Cf sources were used. 4026400200008 Preliminary data are superseded by new experiment. 4026400200009 ENDBIB 7 0 4026400200010 COMMON 1 3 4026400200011 ERR-HL 4026400200012 YR 4026400200013 0.006 4026400200014 ENDCOMMON 3 0 4026400200015 DATA 2 1 4026400200016 DATA ERR-T 4026400200017 PRT/FIS PRT/FIS 4026400200018 3.770 0.045 4026400200019 ENDDATA 3 0 4026400200020 ENDSUBENT 19 0 4026400299999 ENDENTRY 2 0 4026499999999