ENTRY 41595 20131216 41624159500000001 SUBENT 41595001 20131216 41624159500100001 BIB 11 22 4159500100002 INSTITUTE (4RUSRI) 4159500100003 REFERENCE (C,80KIEV,4,119,1980) 4159500100004 (R,INDC(CCP)-169,(4),119,1980) 4159500100005 The same as C,80KIEV,4,119 4159500100006 AUTHOR (B.M.Aleksandrov,E.V.Korolev, Ya.M.Kramarovskiy, 4159500100007 G.E.Lozhkomoev,V.G.Matyukhanov,K.A.Petrzhak, 4159500100008 A.G.Prusakov,A.V.Sorokina,E.A.Shlyamin) 4159500100009 TITLE Absolute measurements of NU(Cf-252) by means of 4159500100010 manganese bath method. 4159500100011 SAMPLE Samples were prepared by evaporation in vacuum on Pt 4159500100012 backings of 0.5 mm thickness. 4159500100013 DECAY-DATA (98-CF-252,2.638YR) 4159500100014 METHOD 1(MANGB) Manganese bath (certificated at 1977 ) - 4159500100015 for neutrons measurement. 4159500100016 DETECTOR (SIBAR) For FF registration. 4159500100017 1(NAICR) Two drift gamma-gamma counters: 4159500100018 - NaI(Tl) of 70 x 70 with FEU-82, 4159500100019 - NaI(Tl) of 150 x 150 with FEU-49b. 4159500100020 PART-DET (N,FF) 4159500100021 CORRECTION For absorption of fast neutrons in S and O was 4159500100022 calculated by Monte-Carlo method. 4159500100023 HISTORY (20131216C) M.M. 4159500100024 ENDBIB 22 0 4159500100025 NOCOMMON 0 0 4159500100026 ENDSUBENT 25 0 4159500199999 SUBENT 41595002 20131216 41624159500200001 BIB 5 38 4159500200002 REACTION (98-CF-252(0,F),,NU) 4159500200003 ANALYSIS Neutron yields were defined by parameters: 4159500200004 - thermal neutrons absorption cross section by S 4159500200005 0.523E-28 m882, 4159500200006 - thermal neutrons absorption cross section by Mn 4159500200007 13.35E-28 m**2, 4159500200008 - Mn-56 decay constant 2.5774 1/hr, 4159500200009 - ratio of thermal neutrons absorption cross section 4159500200010 of H to that of Mn 0.02486 . 4159500200011 CORRECTION - For absorption of fast neutrons in S and O was 4159500200012 calculated by Monte-Carlo method to be 1.00414 . 4159500200013 - For neutron absorption by Mn 1.0132. 4159500200014 - For neutron self-absorption in Cf source cover 4159500200015 1.00756, defined by Au foils . 4159500200016 - For neutron leakage from Mn baht - 1.00243. 4159500200017 ERR-ANALYS Uncertainties of fission rate measurement: 4159500200018 (ERR-1) Counting statistics 4159500200019 (ERR-2) Linear extrapolation of FF energy distribution 4159500200020 tail. 4159500200021 (ERR-3) Cf self-evaporation. 4159500200022 (ERR-4) Solid angle definition. 4159500200023 Uncertainties of neutron distributions: 4159500200024 (ERR-5) Measurement of Mn-56 activity ( statistical). 4159500200025 (ERR-6) Coefficient F definition. 4159500200026 (ERR-7) Efficiency of gamma-counter. 4159500200027 (ERR-8) Neutron leakage. 4159500200028 (ERR-9) Fast neutrons capture by S and O . 4159500200029 (ERR-10) Neutron attenuation in source. 4159500200030 (ERR-11) Mn resonance integral. 4159500200031 (ERR-12) Mn bath chemical purity. 4159500200032 (ERR-13) Cf-252 half-life. 4159500200033 (ERR-T) Total uncertainty was defined as 4159500200034 sqrt(S**2 ((1/3)*sum(SYSi))**2), where 4159500200035 S- average deviation of average measured value, 4159500200036 SYSi - systematical uncertainties. 4159500200037 STATUS (TABLE) Text, pages 123 and Abstract of 4159500200038 C,75KIEV,5,166,1975. 4159500200039 (COREL,40458002) Previous measurement in 1974 year. 4159500200040 ENDBIB 38 0 4159500200041 COMMON 13 9 4159500200042 ERR-1 ERR-2 ERR-3 ERR-4 ERR-5 ERR-6 4159500200043 ERR-7 ERR-8 ERR-9 ERR-10 ERR-11 ERR-12 4159500200044 ERR-13 4159500200045 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 4159500200046 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 4159500200047 PER-CENT 4159500200048 0.05 0.2 0.2 0.2 0.1 0.2 4159500200049 0.11 0.01 0.08 0.1 0.1 0.1 4159500200050 0.15 4159500200051 ENDCOMMON 9 0 4159500200052 DATA 2 1 4159500200053 DATA ERR-T 4159500200054 PRT/FIS PRT/FIS 4159500200055 3.758 0.015 4159500200056 ENDDATA 3 0 4159500200057 ENDSUBENT 56 0 4159500299999 ENDENTRY 2 0 4159599999999