ENTRY 22004 20101119 22252200400000001 SUBENT 22004001 20101119 22252200400100001 BIB 14 42 2200400100002 INSTITUTE (2UK NPL) 2200400100003 REFERENCE (J,MET,21,59,1985) Metrologia 2200400100004 AUTHOR (E.J.Axton,A.G.Bardell) 2200400100005 TITLE -Neutron yield from the spontaneous fission of 2200400100006 Cf-252(nu) 2200400100007 SAMPLE .Cf on VYNS plastic thickness from 20 micro-g/cm2 2200400100008 on including a gold coating. 2200400100009 In total 39 sources were used with a wide range of 2200400100010 source thickness, backing thickness and scattering 2200400100011 conditions in order to randomize their influence 2200400100012 METHOD (MANGB) Manganese bath for measurement of neutron 2200400100013 emission rate 2200400100014 .fission counting in two 2Pi sections individually 2200400100015 and in coincidence 2200400100016 DETECTOR (IOCH)Pill box type ionization chamber for fission 2200400100017 fragments 2200400100018 ANALYSIS .For fission fragments global least squares fit with 2200400100019 full covariance matrix 2200400100020 PART-DET (FF) 2200400100021 (N) 2200400100022 COMMENT .High precision result based on measurements in the 2200400100023 period between 1968 and 1972 2200400100024 STATUS (TABLE) .Data taken from text of Metrol.,21,59,1985 2200400100025 CORRECTION .For neutron emission measurement 2200400100026 - for fast neutron capture in charged particle react. 2200400100027 - for leakage 2200400100028 .for fission fragment measurement 2200400100029 - background was always zero 2200400100030 - dead time 2200400100031 - decay of other fissile isotopes than Cf-252 2200400100032 ERR-ANALYS (DATA-ERR) for fission fragments the uncertainties are 2200400100033 statistical 2200400100034 for the Mn-bath measurement there is a 2200400100035 systematic component in the error due to the 2200400100036 determination of the concentration of the solution 2200400100037 (0.05%) and due to the background subtraction 2200400100038 a correlated uncertainty is due to the efficiency 2200400100039 determination of the Mn-bath(0.3%) 2200400100040 HISTORY (19860506C)HH 2200400100041 (19860703E) 2200400100042 (20101119A) SD:Updated to new date formats,lower case. 2200400100043 corrected according to last EXFOR rules and Dict. 2200400100044 ENDBIB 42 0 2200400100045 NOCOMMON 0 0 2200400100046 ENDSUBENT 45 0 2200400199999 SUBENT 22004002 20101119 22252200400200001 BIB 2 2 2200400200002 REACTION (98-CF-252(0,F),,NU) 2200400200003 HISTORY (20101119A) SD: Units updated 2200400200004 ENDBIB 2 0 2200400200005 NOCOMMON 0 0 2200400200006 DATA 2 1 2200400200007 DATA DATA-ERR 2200400200008 PRT/FIS PRT/FIS 2200400200009 3.7509E+00 1.0700E-02 2200400200010 ENDDATA 3 0 2200400200011 ENDSUBENT 10 0 2200400299999 ENDENTRY 2 0 2200499999999