ENTRY 41112 20200915 41894111200000001 SUBENT 41112001 20200915 41894111200100001 BIB 12 45 4111200100002 TITLE Correction to the results of absolute measurements 4111200100003 of the 235U fission cross section with 1.9 and 4111200100004 2.4-MeV neutrons 4111200100005 AUTHOR (V.A.Kalinin, V.N.Kuz'min, L.M.Solin, V.I.Shpakov, 4111200100006 K.Merla) 4111200100007 INSTITUTE (4RUSRI) Kalinin,Kuz'min,Solin,Shpakov 4111200100008 (2GERDRE) Merla, former 3DDRTUD 4111200100009 REFERENCE (J,AE,71,181,1991) Issue 2. Main Reference. 4111200100010 (J,SJA,71,700,1991) Engl.translation of AE,71,(2),181 4111200100011 (J,AE,64,194,1988) Issue 3. Preliminary results. 4111200100012 (J,SJA,64,239,1988) Engl.translation of AE,64,(3),194 4111200100013 MONITOR Absolute counting 4111200100014 METHOD (ASSOP) Method of time-correlated associated particles 4111200100015 He-3 ( ~ 3 MeV). 4111200100016 Separation of CP trajectories in uniform magnetic field4111200100017 INC-SOURCE (D-D) Deuteron energy 2.8 MeV and 3.4 MeV . 4111200100018 FACILITY (VDG,4RUSRI) Electrostatic accelerator EG-5 4111200100019 DETECTOR (FISCH) Ionization chamber for FF detection. 4111200100020 (SIBAR) Si surface-barrier detector 25 x 45 mm, 4111200100021 layer thickness 45 micron as associated particle 4111200100022 detector. 4111200100023 He-3 counting rate: 4111200100024 (1.5-1.7)*10**3 1/sec for En=1.88 MeV, 4111200100025 (1.2-1.5)*10**3 1/sec for En=2.37 MeV. 4111200100026 SAMPLE U-234 - 0.00111+-0.00001 %, U-235 - 99.9972+-0.0003 %, 4111200100027 U-238 - 0.0017+-0.0003 % . 4111200100028 Target thickness: 4111200100029 0.9+-0.1 mg/cm2 for En=1.88 MeV, 4111200100030 1.6+-0.1 mg/cm2 for En=2.37 MeV. 4111200100031 Surface density of U-235 target 1285+-13 microg/cm2 . 4111200100032 ANALYSIS Fis. c-s is described as: 4111200100033 Nc/(n*Nap), where 4111200100034 Nc - number of coincidences, 4111200100035 n - number of fissile material per cm2 of the target, 4111200100036 Nap - number of detected associated particles. 4111200100037 HISTORY (19921220C) + + Compiled at the Centre - CJD + + 4111200100038 (20040517A) Date is corrected. Status specified 4111200100039 (20070730A) M.M. 2nd Reference was added. MISC in 4111200100040 SUB .002 was added. 4111200100041 (20150513A) V.Z. COVARIANCE lines were corrected 4111200100042 according to new format. 4111200100043 (20150627U) M.M. Articles were checked, BIB information4111200100044 was updated. 4111200100045 (20200915U) INC-SOURCE information was corrected: 4111200100046 D-T -> D-D . Minor correction of free text. 4111200100047 ENDBIB 45 0 4111200100048 NOCOMMON 0 0 4111200100049 ENDSUBENT 48 0 4111200199999 SUBENT 41112002 20200915 41894111200200001 BIB 6 37 4111200200002 REACTION (92-U-235(N,F),,SIG) 4111200200003 COVARIANCE Correlation matrix is given in the form 4111200200004 (XY,2,MEV,EN) 4111200200005 1.88 4111200200006 2.37 4111200200007 Correlation matrix of CS at given energy EN 4111200200008 (Z,4,NO-DIM,COR) 4111200200009 1.00 0.24 4111200200010 0.24 1.00 4111200200011 CORRECTION En 1.88MeV 2.37 MeV 4111200200012 Random coincidences 1.81% 4.88% 4111200200013 Extrapolation of FF spectrum 4111200200014 to zero - 4.02% 2.13% 4111200200015 Absorption of FF in layer of 4111200200016 target (revised in 4111200200017 AE,71,(2),181,1991,see MISC) - 2.18% 4111200200018 Effective thickness of target - 0.31% 4111200200019 Inhomogeneity of target - 0.47% 0.48% 4111200200020 Background in 4111200200021 associated-particle channel - 0-0.25 0.52-0.25 4111200200022 MISC-COL (MISC) Correction for FF absorption in the target. 4111200200023 ERR-ANALYS (ERR-T) Total error. 4111200200024 Source of errors: 4111200200025 (ERR-S) Coincidence statistics 4111200200026 (ERR-1) Random coincidences 4111200200027 (ERR-2) Extrapolation of FF spectrum to zero 4111200200028 (ERR-3) Determination of surface density of target 4111200200029 (ERR-4) Effective thickness of target 4111200200030 (ERR-5) Inhomogeneity of target 4111200200031 (ERR-6) Correction for background in 4111200200032 associated-particle channel 4111200200033 (MISC-ERR) Absolute error of correction for 4111200200034 FF absorption in the target. 4111200200035 STATUS Data corrected compared to 4111200200036 those in Entry 40927. 4111200200037 (TABLE) Table 2 of Atom.Energy,v.71,is.2,p.181,1991. 4111200200038 Errors - Table 3 of Atom.Energy,v.64,is.3,p.194,1988 4111200200039 ENDBIB 37 0 4111200200040 COMMON 5 3 4111200200041 ERR-3 ERR-4 ERR-5 ERR-6 MISC-ERR 4111200200042 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 4111200200043 1.00 0.10 0.10 0.10 0.4 4111200200044 ENDCOMMON 3 0 4111200200045 DATA 8 2 4111200200046 EN EN-ERR DATA ERR-T MISC ERR-S 4111200200047 ERR-1 ERR-2 4111200200048 MEV MEV B B PER-CENT PER-CENT 4111200200049 PER-CENT PER-CENT 4111200200050 1.88 0.003 1.28 0.03 4.0 1.95 4111200200051 0.26 0.1 4111200200052 2.37 0.003 1.27 0.03 3.9 2.10 4111200200053 0.5 0.3 4111200200054 ENDDATA 8 0 4111200200055 ENDSUBENT 54 0 4111200299999 ENDENTRY 2 0 4111299999999