ENTRY 22967 20190418 22782296700000001 SUBENT 22967001 20190418 22782296700100001 BIB 18 58 2296700100002 TITLE Measurement of effective neutron capture cross 2296700100003 section of Americium-243 for thermal neutrons 2296700100004 AUTHOR (M.Ohta, S.Nakamura, H.Harada, T.Fujii, H.Yamana) 2296700100005 INSTITUTE (2JPNJAE) M.Ohta 2296700100006 (2JPNKTO) T.Fujii, H.Yamana 2296700100007 REFERENCE (J,NST,43,1441,2006) Main reference, data are 2296700100008 given 2296700100009 REL-REF (M,22295001,H.Harada+,J,NST,32,395,1995) Experimental 2296700100010 and details of analysis 2296700100011 (R,,R.B.Firestone+,B,FIRESTONE,,,1996) Decay constants 2296700100012 FACILITY (REAC,2JPNKTO) Reactor KURRI of Kyoto university 2296700100013 INC-SOURCE (THCOL) Irradiation of the target was performed in a 2296700100014 hydraulic conveyor tube at the Kyoto University 2296700100015 reactor KUR for 10 hours 2296700100016 SAMPLE A standardized Am-243 solution, equivalent to 3.7E+4 2296700100017 Bq was dropped into a high-purity quartz tube. After 2296700100018 drying up of the solution, the quartz tube was sealed 2296700100019 under evacuation. The monitor wires Co/AL (0.46+- 2296700100020 0.01 wt%,1.6939+-0.0002 mg weight) and Au/AL (0.112+- 2296700100021 0.001 wt%,0.4967+-0.0002 mg weight) and Am243 tube 2296700100022 were wrapped with a thin high-purity aluminium foil, 2296700100023 and housed in an inner Al capsule which was in turn 2296700100024 housed in an outer irradiation capsule 2296700100025 METHOD (ACTIV) Activation 2296700100026 (GSPEC,ASPEC) Gamma and alpha spectroscopy 2296700100027 (STTA) Combined SAMPLE-MONITOR irradiation 2296700100028 DETECTOR (HPGE) Energy resolution (FWHM) is 2.1 keV at the 2296700100029 1.333 MeV peak of 60-Co. For monitor wires gamma 2296700100030 ray detection. 2296700100031 (SIBAR) For alpha-ray detection 2296700100032 INC-SPECT Thermal neutron spectrum with epithermal neutrons 2296700100033 admission. Thermal neutron flux is (9.63+-0.28)E+13 2296700100034 n/cm2/sec, epithermal neutron flux is(3.53+-0.37)E+12 2296700100035 n/cm2/sec. Westcott epithermal index is 0.037+-0.004 2296700100036 MONITOR ((MONIT1)27-CO-59(N,G)27-CO-60,,SIG) 2296700100037 ((MONIT2)79-AU-197(N,G)79-AU-198,,SIG) 2296700100038 MONIT-REF (,S.F.Mughabghab+,B,NEUT.CS 1A,,,1981) See also 2296700100039 (,S.F.Mughabghab,R,INDC(NDS)-440,2003) "Thermal 2296700100040 neutron Capture Cross Sections, Resonance Integrals 2296700100041 and g-Factors" 2296700100042 DECAY-MON (27-CO-60-G,5.271YR,DG,1173.,0.9990, 2296700100043 DG,1333.,0.99982) 2296700100044 (79-AU-198-G,2.695D,DG,412.,0.9558) 2296700100045 DECAY-DATA (95-AM-243,7370.YR,A) 2296700100046 ASSUMED (ASSUM1,27-CO-59(N,G)27-CO-60,,RI) En-Min=0.5 eV 2296700100047 (ASSUM2,79-AU-197(N,G)79-AU-198,,RI) En-Ein=0.5 eV 2296700100048 ERR-ANALYS (ERR-T) Total error 2296700100049 (ERR-1) Error of the decay constant of Am243 2296700100050 (ERR-2) Error of the decay constant of Cm244 2296700100051 (ERR-3) Error of the irradiation time 2296700100052 (ERR-4) Error of the measurement of neutron flux 2296700100053 (ERR-5,,,U) Statistical error for the alpha-ray 2296700100054 measurement of Am-243 2296700100055 (ERR-6,,,U) Statistical error for the alpha-ray 2296700100056 measurement of Cm-244 2296700100057 HISTORY (20070628C) + + Compiled by S.M. 2296700100058 (20090218A) Data in Subent 002 changed from mb to b 2296700100059 (20190418U) SD: NST,32,395 moved to REL-REF. 2296700100060 ENDBIB 58 0 2296700100061 COMMON 15 9 2296700100062 EN-RSL MONIT1 MONIT1-ERR MONIT2 MONIT2-ERR ASSUM1 2296700100063 ASSUM1-ERR ASSUM2 ASSUM2-ERR ERR-1 ERR-2 ERR-3 2296700100064 ERR-4 ERR-5 ERR-6 2296700100065 EV B B B B B 2296700100066 B B PER-CENT PER-CENT PER-CENT PER-CENT 2296700100067 PER-CENT PER-CENT PER-CENT 2296700100068 2.53E-02 37.18 0.06 98.65 0.09 75.9 2296700100069 2.0 1550. 28. 0.54 0.11 0.20 2296700100070 2.88 0.37 0.74 2296700100071 ENDCOMMON 9 0 2296700100072 ENDSUBENT 71 0 2296700199999 SUBENT 22967002 20090218 22082296700200001 BIB 8 21 2296700200002 REACTION (95-AM-243(N,G)95-AM-244,,SIG,,SPA) Data obtained 2296700200003 via CM-244 alpha-activity measurement. Averaged over 2296700200004 Maxwell + epithermal neutron spectrum 2296700200005 DECAY-DATA (95-AM-244-M,2.6E+1MIN,B-) 2296700200006 (95-AM-244-G,10.1HR,B-) 2296700200007 (96-CM-244,18.30YR,A) 2296700200008 ANALYSIS .Gamma-rays from Cobalt monitor was measured after 16 2296700200009 days from the irradiation 2296700200010 (DECAY) .Irradiated Am-243 sample was cooled for one 2296700200011 month after irradiation in order that Am-244-m 2296700200012 and Am-244-g were decayed into Cm-244, then 2296700200013 dissolved with 3M H-N-O3. Reaction rate was 2296700200014 measured from Cm-244 alpha activity 2296700200015 CORRECTION .Cm-244 nuclei number corrected for the decrease 2296700200016 during the cooling 2296700200017 REL-REF (D,,S.F.MUGHABGHAB+,B,NEUT.CS 1B,,1984) 2296700200018 (D,22924002,F.MARIE+,J,NIM/A,556,547,2006) 2296700200019 (D,22924003,F.MARIE+,J,NIM/A,556,547,2006) 2296700200020 MISC-COL (MISC) Westcott epithermal index 2296700200021 STATUS .Text of main reference, p.1443 2296700200022 HISTORY (20090218A) Data changed from mb to b. 2296700200023 ENDBIB 21 0 2296700200024 NOCOMMON 0 0 2296700200025 DATA 5 1 2296700200026 EN-DUMMY DATA ERR-T MISC MISC-ERR 2296700200027 EV B B NO-DIM NO-DIM 2296700200028 2.5 E-02 174.5 5.3 0.037 0.004 2296700200029 ENDDATA 3 0 2296700200030 ENDSUBENT 29 0 2296700299999 ENDENTRY 2 0 2296799999999