ENTRY 41494 20220405 42074149400000001 SUBENT 41494001 20220405 42074149400100001 BIB 11 44 4149400100002 TITLE Relative yield of delayed neutrons and half-life of 4149400100003 their precursor nuclei from U-238 fission by 4149400100004 14.2-17.9 MeV neutrons . 4149400100005 AUTHOR (V.M.Piksaikin,V.A.Roshchenko,G.G.Korolev, 4149400100006 D.E.Gremyachkin,A.S.Egorov,V.F.Mitrofanov,B.F.Samylin, 4149400100007 K.V.Mitrofanov) 4149400100008 INSTITUTE (4RUSFEI) 4149400100009 REFERENCE (J,AE/T,102,151,2007) Engl.translation of AE,102,124 4149400100010 #doi:10.1007/s10512-007-0023-1 4149400100011 (J,AE,102,124,2007) Issue 2. Main reference 4149400100012 (J,PTE,,(6),29,2006) Exp. details 4149400100013 (J,IET,49,765,2006) Issue 6. 4149400100014 Eng. translation of PTE,,(6),29,2006 4149400100015 (J,YK,,(3),5,2018) Data of Subent 002 in Table. 4149400100016 First author D.E.Gremyachkin. 4149400100017 (J,PNE,118,103068,2020) Data confirmed. 4149400100018 First author D.E.Gremyachkin. 4149400100019 FACILITY (VDG,4RUSFEI) Cascade generator KG-2.5 4149400100020 INC-SOURCE (D-T) T(d,n)2-He-4 .Tritium target on molybdenum or 4149400100021 copper backing with titanium layer of 1 mg/cm**2 4149400100022 thickness. Deuteron energy from 0.5 to 2 MeV. 4149400100023 DETECTOR (FISCH,LONGC) For neutron beam monitoring. 4149400100024 (D4PI) For delayed neutron registration, thirty SNM-11 4149400100025 counters with 80% enrichment in B-10, in polyethylene 4149400100026 cylinder of 400 mm diameter and 300 mm height. 4149400100027 Boron Carbide powder, borated polyethylene, cadmium 4149400100028 sheets - for detector protection. 4149400100029 Counters were places as tree rings of 106, 160, 220 mm4149400100030 diameters. 4149400100031 SAMPLE U-238 of 3.995 g was made from metallic uranium of 4149400100032 99.532% U-238 and 0.468% U-235 content.Placed in 4149400100033 titanium ampule. 4149400100034 METHOD (ACTIV) Cyclic radiation, radiation time 180, 360 sec. 4149400100035 Transportation time 0.150 sec. 4149400100036 Delayed neutron detection intervals 524.5, 725.5 sec. 4149400100037 COMMENT Work was made by support of RFBR in Kaluga region 4149400100038 #05-02-08044 4149400100039 HISTORY (20070427C) Compiled at CJD. M.M. 4149400100040 (20150225A) ERR-T -> DATA-ERR in Subent 002. 4149400100041 Minor correction of J,PTE, . 4149400100042 (20210408A) Ref. YK was added. 4149400100043 Misprint in TITLE was corrected. 4149400100044 (20220405A) Several author names were added from 4149400100045 YK,,(3),5,2018. 4149400100046 ENDBIB 44 0 4149400100047 NOCOMMON 0 0 4149400100048 ENDSUBENT 47 0 4149400199999 SUBENT 41494002 20220405 42074149400200001 BIB 6 49 4149400200002 REACTION ((92-U-238(N,F),DL/GRP,NU)/(92-U-238(N,F),DL,NU)) 4149400200003 6-group delayed neutron abundances 4149400200004 ERR-ANALYS (DATA-ERR) Total errors are given 4149400200005 COVARIANCE Correlation matrix: 4149400200006 ai - relative yield, 4149400200007 Ti - HL of delayed neutrons. 4149400200008 (XY,12,N,Correlated Parameters ) 4149400200009 N Parameter 4149400200010 1 a1 4149400200011 2 T1 4149400200012 3 a2 4149400200013 4 T2 4149400200014 5 a3 4149400200015 6 T3 4149400200016 7 a4 4149400200017 8 T4 4149400200018 9 a5 4149400200019 10 T5 4149400200020 11 a6 4149400200021 12 T6 4149400200022 (Z,78,NO-DIM,COR) at EN=17.9 MeV incident neutron 4149400200023 energy (Table 2 of main reference) is given below: 4149400200024 1. 4149400200025 0. 1. 4149400200026 0. 0.79 1. 4149400200027 0. 0.19 0.10 1. 4149400200028 0. 0.31 0.34 0.30 1. 4149400200029 0. 0.09 -0.15 0.63 -0.28 1. 4149400200030 0. 0.55 0.55 0.52 -0.05 0.55 1. 4149400200031 0. 0.09 0.15 0. -0.51 0.02 0.01 1. 4149400200032 0. 0.19 0.21 0.15 0.03 0.07 -0.03 0.32 1. 4149400200033 0. 0.10 0.10 0.10 0. 0.08 -0.12 0.19 0. 1. 4149400200034 0. 0.02 0.02 0.01 0. 0.01 0. 0.03 -.02 .01 1. 4149400200035 0. 0.02 0.03 0.02 0. 0.01 0. 0.04 -.03 0. 0. 1.4149400200036 ADD-RES Average half-life of delayed neutron precursors: 4149400200037 EN, MeV HL, sec 4149400200038 14.2 +- 0.2 5.95 +- 0.15 4149400200039 15.5 +- 0.2 6.02 +- 0.14 4149400200040 16.2 +- 0.2 6.17 +- 0.15 4149400200041 17.9 +- 0.2 6.22 +- 0.15 4149400200042 STATUS (TABLE) Table 1 of At.Energy,v.102,is.2,p.124,2007, 4149400200043 =Table 1 of 4149400200044 J. Progress in Nuclear Energy,v.118,p.103068,2020. 4149400200045 Table 1 of Yad.Konst.,is.3,p.5,2018 - 4149400200046 little different EN: 4149400200047 14.2 - 14.23, 15.5 - 15.83, 16.2 - 16.76, 17.9 - 17.98;4149400200048 HL, DATA, DATA-ERR are the same. 4149400200049 HISTORY (20210408A) GRP-NUM was deleted ( HL is given for each 4149400200050 of six groups). 4149400200051 ENDBIB 49 0 4149400200052 NOCOMMON 0 0 4149400200053 DATA 6 24 4149400200054 EN EN-ERR HL HL-ERR DATA DATA-ERR 4149400200055 MEV MEV SEC SEC NO-DIM NO-DIM 4149400200056 14.2 0.2 53.4 0.4 0.0220 0.0005 4149400200057 14.2 0.2 20.9 0.2 0.144 0.003 4149400200058 14.2 0.2 4.64 0.08 0.188 0.005 4149400200059 14.2 0.2 1.92 0.04 0.412 0.008 4149400200060 14.2 0.2 0.50 0.01 0.180 0.005 4149400200061 14.2 0.2 0.176 0.005 0.054 0.002 4149400200062 15.5 0.2 53.7 0.3 0.0215 0.0004 4149400200063 15.5 0.2 21.0 0.2 0.147 0.003 4149400200064 15.5 0.2 4.64 0.07 0.189 0.005 4149400200065 15.5 0.2 1.99 0.03 0.396 0.007 4149400200066 15.5 0.2 0.50 0.01 0.192 0.005 4149400200067 15.5 0.2 0.178 0.005 0.054 0.002 4149400200068 16.2 0.2 54.2 0.4 0.0221 0.0005 4149400200069 16.2 0.2 21.1 0.2 0.150 0.003 4149400200070 16.2 0.2 4.78 0.09 0.191 0.005 4149400200071 16.2 0.2 1.99 0.04 0.398 0.008 4149400200072 16.2 0.2 0.49 0.01 0.184 0.005 4149400200073 16.2 0.2 0.176 0.005 0.055 0.002 4149400200074 17.9 0.2 52.9 0.3 0.0225 0.0005 4149400200075 17.9 0.2 21.4 0.2 0.149 0.003 4149400200076 17.9 0.2 4.94 0.07 0.198 0.005 4149400200077 17.9 0.2 2.00 0.04 0.379 0.007 4149400200078 17.9 0.2 0.49 0.01 0.195 0.005 4149400200079 17.9 0.2 0.178 0.005 0.056 0.002 4149400200080 ENDDATA 26 0 4149400200081 ENDSUBENT 80 0 4149400299999 ENDENTRY 2 0 4149499999999