ENTRY 31719 20140710 31653171900000001 SUBENT 31719001 20140710 31653171900100001 BIB 15 50 3171900100002 TITLE Novel Method to Study Neutron Capture of 235U and 3171900100003 238U Simultaneously at keV Energies 3171900100004 AUTHOR (A.Wallner,T.Belgya,M.Bichler,K.Buczak,I.Dillmann, 3171900100005 F.Kaeppeler,C.Lederer,A.Mengoni,F.Quinto,P.Steier, 3171900100006 L.Szentmiklosi) 3171900100007 INSTITUTE (3AULCBR,2AUSVIE,3HUNKFI,2AUSATI,2GERKFK,1CANTMF, 3171900100008 2GERFRK,2ITYBOL) 3171900100009 REFERENCE (J,PRL,112,192501,2014) 3171900100010 #doi:10.1103/PhysRevLett.112.192501 3171900100011 (J,KPS,59,1410,2011) 3171900100012 #doi:10.3938/jkps.59.1410 3171900100013 Preliminary results. 3171900100014 FACILITY (REAC,3HUNKFI) PGAA-NIPS facilities at 10 MW Budapest 3171900100015 Research Reactor 3171900100016 http://www.iki.kfki.hu/nuclear/instruments/ 3171900100017 INC-SOURCE (REAC) 3171900100018 INC-SPECT Thermal equivalent neutron fluence: 3171900100019 sample IRMM-3 (0.715+/-0.016)x10**14 n/cm2 3171900100020 sample IRMM-5 (2.78+/-0.06)x10**14 n/cm2 3171900100021 SAMPLE (92-U-235,NAT=0.0072) Uranium-oxide powder 3171900100022 with a natural ratio 238U/235U=137.8. 3171900100023 The material contained low levels of 236U 3171900100024 236U/238U=(0.79+/-0.01)x10**-11 and 239Pu 3171900100025 239Pu/238U<5x10**-13. 3171900100026 Samples: IRMM-3 45.9 mg, IRMM-5 40.9 mg 3171900100027 High-purity Au powder of 2.6 and 4.7 mg was 3171900100028 homogeneously mixed into the uranium-oxide. 3171900100029 The samples were pallets of 6 mm in diam. 3171900100030 and ~0.2 mm thickness. 3171900100031 METHOD (AMS) 3171900100032 (STTA,MOMIX) Au-foil-(U/Au)-pellet-Au-foil 3171900100033 (ACTIV) The equivalent thermal neutron 3171900100034 fluence was determined by Au(n,g) activation 3171900100035 measurement. 3171900100036 Irradiation time 5 and 8 days 3171900100037 REL-REF (I,,P.Steier+,J,NIM/B,268,1045,2010) 3171900100038 AMS at VERA facility. 3171900100039 MONITOR (79-AU-197(N,G)79-AU-198,,SIG) 3171900100040 The same 1/v energy dependence of the capture cross 3171900100041 sections from thermal to cold energies for uranium 3171900100042 and gold was assumed. 3171900100043 MONIT-REF (,,3,ENDF/B-VII.1,,2010) 3171900100044 ERR-ANALYS (ERR-T) The total uncertainties consist of: 3171900100045 (ERR-1,2.,4.) Atom ratios determined by AMS 3171900100046 (ERR-2) Neutron fluence - 2.2% 3171900100047 STATUS (TABLE) Data from p.192501-5 of PRL,112,192501,2014 3171900100048 HISTORY (20111229C) VS. 3171900100049 (20131222U) VS. FACILITY: 3HUNII -> 3HUNKFI 3171900100050 (20140706C) VS. Reference PRL,112,192501,2014 added. 3171900100051 Entry modified according to the main ref. 3171900100052 ENDBIB 50 0 3171900100053 NOCOMMON 0 0 3171900100054 ENDSUBENT 53 0 3171900199999 SUBENT 31719002 20140706 31653171900200001 BIB 1 1 3171900200002 REACTION (92-U-235(N,G)92-U-236,,SIG) 3171900200003 ENDBIB 1 0 3171900200004 NOCOMMON 0 0 3171900200005 DATA 6 1 3171900200006 EN-DUMMY DATA ERR-T ERR-2 MONIT MONIT-ERR 3171900200007 EV B B PER-CENT B B 3171900200008 0.0253 100.5 2.1 2.2 98.65 0.09 3171900200009 ENDDATA 3 0 3171900200010 ENDSUBENT 9 0 3171900299999 ENDENTRY 2 0 3171999999999