ENTRY 31720 20140401 31633172000000001 SUBENT 31720001 20140401 31633172000100001 BIB 14 42 3172000100002 TITLE Measurement of 241Am ground state radiative neutron 3172000100003 capture cross section with cold neutron beam 3172000100004 AUTHOR (T.Belgya, L.Szentmiklosi, Z.Kis, N.M.Nagy, J.Konya) 3172000100005 INSTITUTE (3HUNKFI,3HUNKOS) 3172000100006 REFERENCE (R,INDC(HUN)-0037,2012) 3172000100007 REL-REF (I,,T.Belgya+,J,JRN,276,269,2008) 3172000100008 Supermirror guide of the in-beam Moessbauer station 3172000100009 FACILITY (REAC,3HUNKFI) Budapest Research Reactor 3172000100010 SAMPLE Total mass: 236.4 +/- 0.5 mg. 3172000100011 Am-241 metal sintered on a 0.196 mm thick Ag backing 3172000100012 and covered by 2.33-um Au layer. 3172000100013 Am mass was determined by 60 keV gamma ray intensity 3172000100014 9.27 MBq (+/- 1.8%) ~ 73.1 mu-g. 3172000100015 Ag thickness was determined by 60 keV gamma ray from 3172000100016 Am-241 layer. 3172000100017 Au thickness was determined by its activity after 3172000100018 irradiation using 62.02 mg Au monitor activity 3172000100019 considering flux attenuation. 3172000100020 INC-SOURCE (REAC) thermal equivalent neutron flux: ~1e+9 n/cm2/s 3172000100021 DETECTOR (LEGE) CANBERRA0215R in a Pb cage 3172000100022 Efficiency determined at 22.7 cm distance from 133Ba, 3172000100023 152Eu and 241Am source. 3172000100024 Resolution: 0.5 keV at 100 keV. 3172000100025 METHOD (ACTIV) Irradiated for 90120 sec. 3172000100026 (GSPEC) Measured at 22.7 cm from target 3172000100027 Au: Measured for 26847 sec after 11.7 days cooling 3172000100028 Am: Measured for 97 hrs after 66308 sec cooling 3172000100029 ASSUMED (ASSUM,95-AM-241(N,G)95-AM-242-G/T,,SIG/RAT) 3172000100030 Branching ratio 3172000100031 ERR-ANALYS (ASSUM-ERR) Branching ratio to 242Am g.s. (syst.) 3172000100032 (ERR-T) Total uncertainty 3172000100033 (ERR-1) Number of 242Am per starting particle in MCNP 3172000100034 calc.(stat.) 3172000100035 (ERR-2) Number of 242Am per starting particle in MCNP 3172000100036 calc.(syst.) 3172000100037 (ERR-3) Number of 198Au (stat.) 3172000100038 (ERR-4) Number of 198Au (syst.) 3172000100039 (ERR-5) Number of 198Au per starting particle in MCNP 3172000100040 calc.(stat.) 3172000100041 STATUS (TABLE) Text in Report INDC(HUN)-0037 (2012) 3172000100042 HISTORY (20120114C) On 3172000100043 (20131222U) VS. 3HUNII -> 3HUNKFI 3172000100044 ENDBIB 42 0 3172000100045 COMMON 7 6 3172000100046 ASSUM ASSUM-ERR ERR-1 ERR-2 ERR-3 ERR-4 3172000100047 ERR-5 3172000100048 NO-DIM PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 3172000100049 PER-CENT 3172000100050 0.914 0.8 1.4 1.1 1.0 0.6 3172000100051 0.1 3172000100052 ENDCOMMON 6 0 3172000100053 ENDSUBENT 52 0 3172000199999 SUBENT 31720002 20120114 31543172000200001 BIB 4 15 3172000200002 REACTION (95-AM-241(N,G)95-AM-242-G,,SIG) 3172000200003 DECAY-DATA (95-AM-242-G,16.02HR,XR,99.5,0.0355, 3172000200004 XR,103.4,0.056) 3172000200005 ANALYSIS Unweighted average of 99.5 and 103.4 keV X-rays data 3172000200006 COMMENT - Tamas Belgya (in article): 3172000200007 The mean value of 591 +/- 35 b of our total capture 3172000200008 cross section for 241Am is at the low end of the 3172000200009 most recent values, but is in agreement with most of 3172000200010 them within its uncertainty. 3172000200011 The uncertainty is mainly coming from the systematic 3172000200012 uncertainty of the 242Pu X-ray production probability3172000200013 in the electron conversion of the 242Am ground state.3172000200014 - Tamas Belgya (2012-01-31): 3172000200015 We could measure only the ground state cross section, 3172000200016 but the MCNP can give only the g+m cross section. 3172000200017 ENDBIB 15 0 3172000200018 NOCOMMON 0 0 3172000200019 DATA 3 1 3172000200020 EN DATA ERR-T 3172000200021 MILLI-EV B B 3172000200022 25.3 540. 32. 3172000200023 ENDDATA 3 0 3172000200024 ENDSUBENT 23 0 3172000299999 ENDENTRY 2 0 3172099999999