ENTRY 41509 20090202 41494150900000001 SUBENT 41509001 20090202 41494150900100001 BIB 13 38 4150900100002 TITLE Yield of delayed neutrons in the reaction Cm-245(n,f) 4150900100003 on thermal neutrons. 4150900100004 AUTHOR (V.R.Andrianov, V.N.Vyachin, A.A.Druzhinin,V.I.Furman, 4150900100005 N.A.Gundorin, A.N.Likhachev, L.B.Pikel'ner,N.V.Rebrova,4150900100006 I.M.Salamatin, V.N.Vyachin, K.V.Zhdanova) 4150900100007 INSTITUTE (4ZZZDUB) Neutron Physics Lab. 4150900100008 REFERENCE (J,YF,71,(10),1705,2008) 4150900100009 (J,PAN,71,(10),1675,2008) English translation of YF,71.4150900100010 #doi:10.1134/S1063778808100037 4150900100011 REL-REF (M,,S.B.Borzakov+,J,AE,79,231,1995) 4150900100012 Method of measurement. 4150900100013 (I,41501001,N.A.Gundorin+,J,YF,70,1011,2007) 4150900100014 Setup details. 4150900100015 FACILITY (REAC,4ZZZDUB) IBR-2 reactor, 5 Hz, 1300 MWt at peak. 4150900100016 "ISOMER-M" setup. 4150900100017 INC-SOURCE (REAC) Thermal neutrons, channel 11-m of IBR-2, 4150900100018 vacuum bent mirror neutron guide to suppress epithermal4150900100019 neutrons. 4150900100020 INC-SPECT No information. 4150900100021 SAMPLE Cm sample content: 4150900100022 Cm-244 - 3.78% (0.076 mg); 4150900100023 Cm-245 - 95.46 % (1.91 mg); 4150900100024 Cm-246 - 0.71 % (0.014 mg). 4150900100025 Cm sample in each section of IOCH, on both sides of 4150900100026 Ni backing of 0.1 mm thickness, Cm layer thickness 4150900100027 about 300 microg/cm**2, diameter 10 mm. 4150900100028 Total sample mass 2 mg . 4150900100029 DETECTOR (IOCH) Four-sections ionization fission chamber. 4150900100030 CH4 as working gas at 1.3 atm pressure. 4150900100031 METHOD (COINC) Anti-coincidence of neutrons and fission 4150900100032 fragments. 4150900100033 Cd-ping-pong - to measure background. 4150900100034 Ratio of detector efficiencies of prompt to delayed 4150900100035 neutrons was measured by U-235 standard sample and 4150900100036 obtained to be 0.680+-0.016 ; was used to calculate 4150900100037 NU-delayed. 4150900100038 CORRECTION For backgrounds. 4150900100039 HISTORY (20090202C) Compiled at CJD (M.M.) 4150900100040 ENDBIB 38 0 4150900100041 NOCOMMON 0 0 4150900100042 ENDSUBENT 41 0 4150900199999 SUBENT 41509002 20090202 41494150900200001 BIB 5 17 4150900200002 REACTION (96-CM-245(N,F),DL,NU,,SPA) 4150900200003 Absolute yield of delayed neutrons. 4150900200004 MONITOR ((MONIT1)96-CM-245(N,F),PR,NU) 4150900200005 ((MONIT2)92-U-235(N,F),PR,NU) 4150900200006 ((MONIT3)92-U-235(N,F),DL,NU) 4150900200007 MONIT2 and MONIT3 were used to obtain the 4150900200008 efficiencies ratio of prompt to delayed neutrons 4150900200009 EPSp/EPSd. 4150900200010 MONIT-REF ((MONIT1),,B,LANDOLT,16,9,2000) 4150900200011 ((MONIT2),,B,LANDOLT,16,9,2000) 4150900200012 From LANDOLT-BOERSTEIN, vol.16. 4150900200013 Low Energy Neutron Physics (Springer). 4150900200014 ((MONIT3),E.Fort+,J,PNE,41,385,2002) 4150900200015 ERR-ANALYS (DATA-ERR) Not specified. 4150900200016 (ERR-1,,3.) Uncertainty of measured ratio Np/Nd < 3.% .4150900200017 STATUS (TABLE) From text of J,YF,71,(10),1705,2008, 4150900200018 pages 1705, 1712, 1713. 4150900200019 ENDBIB 17 0 4150900200020 COMMON 6 3 4150900200021 MONIT1 MONIT1-ERR MONIT2 MONIT2-ERR MONIT3 MONIT3-ERR 4150900200022 PRT/FIS PRT/FIS PRT/FIS PRT/FIS PRT/FIS PRT/FIS 4150900200023 3.82 0.03 2.413 0.007 0.01659 0.00035 4150900200024 ENDCOMMON 3 0 4150900200025 DATA 3 1 4150900200026 EN-DUMMY DATA DATA-ERR 4150900200027 EV PC/FIS PC/FIS 4150900200028 0.0253 0.64 0.02 4150900200029 ENDDATA 3 0 4150900200030 ENDSUBENT 29 0 4150900299999 ENDENTRY 2 0 4150999999999