ENTRY 12578 20140414 14011257800000001 SUBENT 12578001 20140414 14011257800100001 BIB 12 30 1257800100002 INSTITUTE (1USALRL) 1257800100003 REFERENCE (J,JNE,8,224,1959) 1257800100004 AUTHOR (R.W.Hoff,E.K.Hulet,M.C.Michel) 1257800100005 TITLE Branching ratio of 242m Am decay. 1257800100006 SAMPLE Approximately 1 mg samples of this americium were 1257800100007 sealed in quartz capsules and irradiated in the 1257800100008 'rabbit' facility of the MTR. 1257800100009 FACILITY (REAC,1USALRL) U235-H2O reactor, MTR. 1257800100010 INC-SPECT Four irradiations of 24 hours and one of 48 hours were 1257800100011 made in neutron fluxes in the range 1257800100012 1-2 x 10**14 neutrons/cm2/sec. The neutron fluxes 1257800100013 were monitored using cobalt activation standards. 1257800100014 METHOD (CHSEP) 1257800100015 DETECTOR (IOCH) The alpha counting was done in an argon-filled, 1257800100016 ionization-type counter of known efficiency (52%). 1257800100017 The alpha pulse analyses were performed in an argon 1257800100018 filled ionization chamber connected to a 50 channel 1257800100019 differential pulse-height analyser. The mass analyses 1257800100020 of the plutonium were performed using a 12 in. radius, 1257800100021 60.degr. sector, magnetic mass-spectrograph. 1257800100022 ERR-ANALYS (DATA-ERR) Uncertainty includes statistical errors in 1257800100023 the alpha counting and mass analyses and the 1257800100024 uncertainties in flux measurements and in the assumed 1257800100025 cross-section for 242m-Am destruction. 1257800100026 STATUS (TABLE) Data from the text of JNE,8,224 1257800100027 HISTORY (19760804T) Translated from SCISRS 1257800100028 (19841024A) BIB corrections. 1257800100029 (20140414A) SD: Updated to new date formats,lower case.1257800100030 Corrections according last EXFOR rules and Dict. 1257800100031 REACTION code corrected in Subents 2,3. 1257800100032 ENDBIB 30 0 1257800100033 NOCOMMON 0 0 1257800100034 ENDSUBENT 33 0 1257800199999 SUBENT 12578002 20140414 14011257800200001 BIB 6 11 1257800200002 REACTION (95-AM-241(N,G)95-AM-242-G,,SIG,,SPA) 1257800200003 ANALYSIS Neutron capture cross-sections to form 242Cm were 1257800200004 measured for all five irradiations. Total cross- 1257800200005 sections for Am-241(n,g)Am-242g have been derived from 1257800200006 these measurements and the measured branching ratio of 1257800200007 Am-242g and assuming total destruction cross-section 1257800200008 of 6000 barns to Am-242g. 1257800200009 METHOD (ACTIV) Activation 1257800200010 DECAY-DATA (95-AM-242-G,16.HR,B-,,0.84) 1257800200011 ASSUMED (ASSUM,95-AM-242(N,ABS),,SIG,,SPA) 1257800200012 HISTORY (20140414A) SD: SF4=Am-242-M->Am-242-G in REACTION code1257800200013 ENDBIB 11 0 1257800200014 NOCOMMON 0 0 1257800200015 DATA 4 1 1257800200016 EN-DUMMY DATA DATA-ERR ASSUM 1257800200017 MEV B B B 1257800200018 2.53E-08 6.20E+02 6.5E+01 6000. 1257800200019 ENDDATA 3 0 1257800200020 ENDSUBENT 19 0 1257800299999 SUBENT 12578003 20140414 14011257800300001 BIB 5 6 1257800300002 REACTION (95-AM-241(N,G)95-AM-242-M,,SIG,,SPA) 1257800300003 FACILITY (SPECM) Mass spectrometer 1257800300004 METHOD From equilibrium mixture Am241-Am242(152yr) after long 1257800300005 irradiation in MTR. 1257800300006 ASSUMED (ASSUM,95-AM-242-M(N,ABS),,SIG) 1257800300007 HISTORY (20140414A) SD:SF4=Am-242-M2->Am-242-M in REACTION code1257800300008 ENDBIB 6 0 1257800300009 NOCOMMON 0 0 1257800300010 DATA 3 1 1257800300011 EN-DUMMY DATA ASSUM 1257800300012 MEV B B 1257800300013 2.53E-08 1.20E+02 8000. 1257800300014 ENDDATA 3 0 1257800300015 ENDSUBENT 14 0 1257800399999 NOSUBENT 12578004 20140414 14011257800400001 ENDENTRY 4 0 1257899999999