ENTRY 41749 20220406 42074174900000001 SUBENT 41749001 20220406 42074174900100001 BIB 13 30 4174900100002 TITLE Measuring method of the delayed neutron time parameters4174900100003 for U-236 fission by neutrons with energies from 14. to4174900100004 18 MeV 4174900100005 AUTHOR (D.E.Gremyachkin, V.M.Piksaikin, A.S.Egorov, 4174900100006 V.F.Mitrofanov, K.V.Mitrofanov) 4174900100007 REFERENCE ((S,ISINN-27,221,2020)= 4174900100008 (R,JINR-E3-2020-10,221,2020)) In English. 4174900100009 INSTITUTE (4RUSFEI) 4174900100010 FACILITY (VDG,4RUSFEI) Cascade generator KG-2.5 (=CG-2.5). 4174900100011 INC-SOURCE (D-T) Solid tritium target. 4174900100012 METHOD (ACTIV) Cyclic irradiations of the samples in a 4174900100013 well-defined neutron flux followed by the measurement 4174900100014 of the time dependence of delayed neutron activity. 4174900100015 DETECTOR (D4PI) For delayed neutron registration, thirty SNM-11 4174900100016 boron counters assembly placed in polyethylene 4174900100017 moderator ( 400 mm outer diameter, 300 mm length) 4174900100018 as three circles of 53, 80,110 mm radius. 4174900100019 Detector was shielded with boron carbide, cadmium and 4174900100020 borated polyethylene. 4174900100021 Detector - accelerator target distance 3 m. 4174900100022 SAMPLE No information. 4174900100023 CORRECTION For blocking effect and concomitant source; estimated 4174900100024 in an additional experiment. 4174900100025 ANALYSIS Time dependence of induced neutron activity was fitted4174900100026 by iterative least squares method using 6-group model 4174900100027 parameters of delayed neutron abundances and half-lives4174900100028 of their precursors. 4174900100029 ERR-ANALYS (DATA-ERR) Type of uncertainty is not explained in the 4174900100030 article. 4174900100031 HISTORY (20220406C) M.M. 4174900100032 ENDBIB 30 0 4174900100033 NOCOMMON 0 0 4174900100034 ENDSUBENT 33 0 4174900199999 SUBENT 41749002 20220406 42074174900200001 BIB 4 39 4174900200002 REACTION ((92-U-236(N,F),DL/GRP,NU)/(92-U-236(N,F),DL,NU)) 4174900200003 Relative abundances of delayed neutrons in 6-groups 4174900200004 model presentation. 4174900200005 COVARIANCE Correlation matrix for EN=15.83 MeV : 4174900200006 ai - relative yield, 4174900200007 Ti - HL of delayed neutrons. 4174900200008 (XY,12,N,Correlated Parameters) 4174900200009 N Parameter 4174900200010 1 a1 4174900200011 2 T1 4174900200012 3 a2 4174900200013 4 T2 4174900200014 5 a3 4174900200015 6 T3 4174900200016 7 a4 4174900200017 8 T4 4174900200018 9 a5 4174900200019 10 T5 4174900200020 11 a6 4174900200021 12 T6 4174900200022 (Z,78,NO-DIM,COR) 4174900200023 1. 4174900200024 0. 1. 4174900200025 0. 0.79 1. 4174900200026 0. 0.43 0.18 1. 4174900200027 0. 0.46 0.43 0.42 1. 4174900200028 0. 0.15 -0.19 0.59 -0.27 1. 4174900200029 0. 0.55 0.42 0.56 -0.01 0.63 1. 4174900200030 0. 0.12 0.15 0.06 -0.45 0.14 0.18 1. 4174900200031 0. 0.02 0.01 0.01 0. 0.01 -0.02 0.03 1. 4174900200032 0. 0.01 0.01 0.01 0. 0.01 -0.02 0.01 0. 1. 4174900200033 0. 0.01 0.01 0. 0. 0. -0.01 0.01 0. 0. 1. 4174900200034 0. 0.01 0.01 0.01 0. 0. -0.01 0.02 0. 0. 0. 1. 4174900200035 ADD-RES Average half-life of delayed neutron precursors: 4174900200036 EN, MeV HL, sec 4174900200037 14.23+-0.23 7.48+-0.07 4174900200038 15.83+-0.20 7.79+-0.22 4174900200039 17.98+-0.25 8.20+-0.09 4174900200040 STATUS (TABLE) Table 1 of ISINN-27,p.221,2019 4174900200041 ENDBIB 39 0 4174900200042 NOCOMMON 0 0 4174900200043 DATA 6 18 4174900200044 EN EN-ERR HL HL-ERR DATA DATA-ERR 4174900200045 MEV MEV SEC SEC NO-DIM NO-DIM 4174900200046 14.23 0.23 55.01 0.32 0.0389 0.0006 4174900200047 14.23 0.23 20.46 0.17 0.165 0.003 4174900200048 14.23 0.23 4.09 0.04 0.321 0.005 4174900200049 14.23 0.23 1.49 0.02 0.431 0.007 4174900200050 14.23 0.23 0.47 0.01 0.025 0.001 4174900200051 14.23 0.23 0.214 0.005 0.0190 0.0004 4174900200052 15.83 0.20 54.78 0.31 0.040 0.001 4174900200053 15.83 0.20 20.58 0.19 0.172 0.003 4174900200054 15.83 0.20 4.32 0.05 0.318 0.007 4174900200055 15.83 0.20 1.57 0.03 0.423 0.008 4174900200056 15.83 0.20 0.48 0.01 0.026 0.001 4174900200057 15.83 0.20 0.214 0.006 0.020 0.001 4174900200058 17.98 0.25 52.95 0.32 0.0393 0.0006 4174900200059 17.98 0.25 20.62 0.16 0.199 0.003 4174900200060 17.98 0.25 4.31 0.05 0.324 0.005 4174900200061 17.98 0.25 1.51 0.03 0.391 0.007 4174900200062 17.98 0.25 0.47 0.01 0.026 0.001 4174900200063 17.98 0.25 0.214 0.005 0.0194 0.0004 4174900200064 ENDDATA 20 0 4174900200065 ENDSUBENT 64 0 4174900299999 ENDENTRY 2 0 4174999999999