ENTRY 21690 20210802 23032169000000001 SUBENT 21690001 20210802 23032169000100001 BIB 13 61 2169000100002 TITLE The isomeric ratio in thermal and fast neutron 2169000100003 capture of americium-241 2169000100004 AUTHOR (K.Wisshak,J.Wickenhauser,F.Kaeppeler, 2169000100005 G.Reffo,F.Fabbri) 2169000100006 REFERENCE (J,NSE,81,396,1982) 2169000100007 (R,INDC(GER)-0053,2021) Revised values of Karlsruhe 2169000100008 cross sections. 2169000100009 ((P,INDC(GER)-22,15,1980)=(P,KFK-3068,21,1980)= 2169000100010 (P,NEANDC(E)-212,(5),15,1980)) 2169000100011 (C,79KNOX,,867,1979) 2169000100012 INSTITUTE (2GERKFK) K.W., J.W., F.K. 2169000100013 (2ITYUBO) G.R, F.F. 2169000100014 FACILITY (REAC,2GERKFK) The Karlsruhe FR2 reactor. 2169000100015 (VDG,2GERKFK) 3 MV Van de Graaff accelerator. 2169000100016 INC-SOURCE (REAC ) Thermal monoenergetic neutrons at 14.75 meV 2169000100017 from the exit collimator of the graphite 2169000100018 monochromator at the Karlsruhe FR2 reactor. 2169000100019 The second order of the spectrum was suppressed2169000100020 by a pyrolytic graphite filter. 2169000100021 The beam energy resolution was 4%, and 2169000100022 it was collimated to a square of side 15 mm 2169000100023 the flux was 5.x 10**6 neutrons/sec/cm2. 2169000100024 (P-LI7) the Li-7(p,n) reaction using the Van de 2169000100025 Graaff accelerator. 2169000100026 SAMPLE Four samples were made, consisting of 7 mm 2169000100027 diameter, 0.7 mg/cm2 thick Am-241 and gold 2169000100028 layers fixed on either side of a 10 um thick 2169000100029 aluminium foil. The masses of each sample are given 2169000100030 below in ug. 2169000100031 Sample Am-241 mass gold mass 2169000100032 ------ ----------- --------- 2169000100033 1 285.3 240.4 2169000100034 2 285.3 260.5 2169000100035 3 251.0 240.4 2169000100036 4 285.3 260.5 2169000100037 METHOD (ACTIV) Activation of the sample for about 11-22 H 2169000100038 DETECTOR (MAGSP) A mini orange spectrometer consisting of a 2169000100039 filter of permanent magnets and a Si(Li)-detector 2169000100040 for energy analysis. 2169000100041 DECAY-DATA (95-AM-242-G,16.HR,B-) 2169000100042 STATUS (TABLE) Subentries 2 3 and 4 contain superseded data 2169000100043 from the KFK report. Subentries 5 and 6 contain data 2169000100044 taken from tables 3 and 4 in the Nucl.Sci.&Eng.81,396 2169000100045 CORRECTION Background counts, due principally to conversion 2169000100046 electrons from Am-241 decay. 2169000100047 Beta particle transmission factors for the magnetic 2169000100048 spectrometer. 2169000100049 Fraction of beta spectrum above the non-detection 2169000100050 threshold. 2169000100051 Difference in neutron flux incident on Am-241 and Au 2169000100052 samples. 2169000100053 HISTORY (19801205C) CN. 2169000100054 (19820913A) A.P.T. Final report published. 2169000100055 (19830418U) A.P.T. Subwork 6 corrected. 2169000100056 (20101117U) SD:Updated to new date formats,lower case. 2169000100057 Corrections in all Subents. 2169000100058 (20121108A) SD: DECAY-DATA was added in Subents 5,6 2169000100059 (20201012A) SD: Correction in Subent 006. 2169000100060 PART-DET -> RAD-DET. 2169000100061 (20210802A) SD: Corrections according to MEMO CP-C/472.2169000100062 Subent 007 added. 2169000100063 ENDBIB 61 0 2169000100064 NOCOMMON 0 0 2169000100065 ENDSUBENT 64 0 2169000199999 SUBENT 21690002 20101117 22252169000200001 BIB 4 9 2169000200002 REACTION ((95-AM-241(N,G)95-AM-242-G,,SIG)/ 2169000200003 (79-AU-197(N,G)79-AU-198,,SIG)) 2169000200004 COMMENT .Data are preliminary. 2169000200005 STATUS (SPSDD,21690005) Data taken from table 1 in the 2169000200006 KFK report. 2169000200007 HISTORY (19801205C) 2169000200008 (19801218E) 2169000200009 (19820913A) A.P.T. Final report published. 2169000200010 (19820921E) 2169000200011 ENDBIB 9 0 2169000200012 NOCOMMON 0 0 2169000200013 NODATA 0 0 2169000200014 ENDSUBENT 13 0 2169000299999 SUBENT 21690003 20101117 22252169000300001 BIB 5 15 2169000300002 REACTION (95-AM-241(N,G)95-AM-242-G,,SIG) 2169000300003 ASSUMED (ASSUM,79-AU-197(N,G)79-AU-198,,SIG) The 2169000300004 assumed data at 14.75 milli-eV were calculated from 2169000300005 the 2200 m/sec value taken from BNL-325 assuming A 2169000300006 1/V-dependence of the cross section. The assumed keV 2169000300007 data were taken from ENDF/B-IV. 2169000300008 COMMENT .Data are preliminary. 2169000300009 STATUS (SPSDD,21690005) 2169000300010 (SPSDD,21690006) 2169000300011 Refer to data in subentries 5 and 6 2169000300012 data taken from table 1 in the KFK report. 2169000300013 HISTORY (19801205C) 2169000300014 (19801218E) 2169000300015 (19820913A) A.P.T. Final report published. 2169000300016 (19820921E) 2169000300017 ENDBIB 15 0 2169000300018 NOCOMMON 0 0 2169000300019 NODATA 0 0 2169000300020 ENDSUBENT 19 0 2169000399999 SUBENT 21690004 20101117 22252169000400001 BIB 5 14 2169000400002 REACTION (95-AM-241(N,G)95-AM-242-G/T,,SIG/RAT) 2169000400003 ASSUMED (ASSUM,95-AM-241(N,G)95-AM-242,,SIG) The assumed 2169000400004 data at 14.75 milli-eV were calculated from the 2200 2169000400005 m/sec value from NEANDC l-116,p.177 Assuming a 1/V 2169000400006 dependence of the cross section. The assumed keV 2169000400007 data were taken from own measurement accepted for 2169000400008 publication in Nucl.Sci.Eng. 2169000400009 COMMENT .Data are preliminary. 2169000400010 STATUS (SPSDD,21690006) Data taken from table 1 in 2169000400011 the KFK report. 2169000400012 HISTORY (19801205C) 2169000400013 (19801218E) 2169000400014 (19820913A) A.P.T. Final report published. 2169000400015 (19820921E) 2169000400016 ENDBIB 14 0 2169000400017 NOCOMMON 0 0 2169000400018 NODATA 0 0 2169000400019 ENDSUBENT 18 0 2169000499999 SUBENT 21690005 20121108 22342169000500001 BIB 6 28 2169000500002 REACTION ((95-AM-241(N,G)95-AM-242-G,,SIG)/ 2169000500003 (79-AU-197(N,G)79-AU-198,,SIG)) 2169000500004 DECAY-DATA (95-AM-242-G,16.HR) 2169000500005 STATUS (TABLE) .Data taken from tables 3 and 4 in the 2169000500006 Nucl.Sci.&Eng.81,396,1982. 2169000500007 ERR-ANALYS (ERR-T) Total error. 2169000500008 (ERR-S) Total statistical error for Am-241 and Au 2169000500009 samples. 2169000500010 (ERR-1) Quadratic sum of errors in Am-241 and gold 2169000500011 sample masses. 2169000500012 (ERR-2) Quadratic sum of errors in time dependence and 2169000500013 energy distribution of neutron flux. 2169000500014 (ERR-3) Error in sample distance during activation 2169000500015 (ERR-4) quadratic sum of errors in background 2169000500016 subtraction for Am-241 and gold samples. 2169000500017 (ERR-5) Quadratic sum of errors in energy calibration 2169000500018 and relative transmission of spectrometer. 2169000500019 (ERR-6) Error in sample position in spectrometer. 2169000500020 (ERR-7) Error in spectrum fraction above threshold. 2169000500021 (ERR-8) Error in backscattering from detector. 2169000500022 (ERR-9) Error in decay data. 2169000500023 FLAG (1.) sample was 251.0 mu-g, gold - 0.86 mu-g 2169000500024 In all other measurements: sample was 285.3 mu-g, 2169000500025 gold - 0.98 mu-g 2169000500026 HISTORY (19820914C) A.P.T. 2169000500027 (19820921E) 2169000500028 (20101117A) SD: FLAG added. 2169000500029 (20121108A) SD: DECAY-DATA was added. 2169000500030 ENDBIB 28 0 2169000500031 NOCOMMON 0 0 2169000500032 DATA 17 4 2169000500033 EN EN-RSL +EN-RSL -EN-RSL DATA ERR-T 2169000500034 ERR-S ERR-1 ERR-2 ERR-3 ERR-4 ERR-5 2169000500035 ERR-6 ERR-7 ERR-8 ERR-9 FLAG 2169000500036 EV PER-CENT EV EV NO-DIM NO-DIM 2169000500037 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 2169000500038 PER-CENT PER-CENT PER-CENT PER-CENT NO-DIM 2169000500039 1.4750E-02 4.0000E+00 5.7900E+00 3.3000E-012169000500040 1.8000E+00 1.1000E+00 1.5000E+00 8.5000E-01 3.0000E+002169000500041 9.0000E-01 3.6000E+00 1.5000E+00 5.0000E-01 2169000500042 2.7000E+04 1.9000E+04 1.7000E+04 2.7800E+00 2.4000E-012169000500043 4.3000E+00 1.1000E+00 7.1000E-01 1.8000E+00 5.4000E+00 3.0000E+002169000500044 9.0000E-01 3.6000E+00 1.5000E+00 5.0000E-01 2169000500045 2.9000E+04 3.7000E+04 1.9000E+04 2.7300E+00 1.6000E-012169000500046 1.7000E+00 1.1000E+00 7.1000E-01 1.8000E+00 1.2000E+00 3.0000E+002169000500047 9.0000E-01 3.6000E+00 1.5000E+00 5.0000E-01 2169000500048 2.9000E+04 3.7000E+04 1.9000E+04 2.7200E+00 1.8000E-012169000500049 2.6000E+00 1.1000E+00 7.1000E-01 1.8000E+00 2.5000E+00 3.0000E+002169000500050 9.0000E-01 3.6000E+00 1.5000E+00 5.0000E-01 1.0 2169000500051 ENDDATA 18 0 2169000500052 ENDSUBENT 51 0 2169000599999 SUBENT 21690006 20210802 23032169000600001 BIB 10 57 2169000600002 REACTION (95-AM-241(N,G)95-AM-242-G/T,,SIG/RAT,,,DERIV) 2169000600003 MONITOR ((79-AU-197(N,G)79-AU-198,,SIG)/ 2169000600004 (95-AM-241(N,G)95-AM-242,,SIG)) 2169000600005 ANALYSIS Measured 241Am(n,gamma)242gAm/197Au(n,gamma)198Au 2169000600006 ratio multiplied by evaluated 2169000600007 197Au(n,gamma)198Au/241Am(n,gamma)242Am" 2169000600008 ASSUMED (ASSUM1,95-AM-241(N,G)95-AM-242,,SIG) 2169000600009 The value at 14.75 meV was extrapolated, 2169000600010 assuming 1/V dependence, from the 2200 m/s value 2169000600011 taken from B.Goel, Proc. Specialists' Meeting 2169000600012 Nuclear Data of Pu and Am isotopes for reactor 2169000600013 applications, Upton, New York, November 20-21, 2169000600014 1978, BNL-50991, page 177. 2169000600015 The values in the keV range are taken from 2169000600016 Wisshak and Kaeppeler, NSE,76,148, (1980), 2169000600017 EXFOR 20774, supplemented by data from Weston 2169000600018 and Todd NSE,61,356,(1976), and from Gayther 2169000600019 and Thomas, Proc. 4Th All Union Conference 2169000600020 Neutron Physics, Kiev, USSR, April 18-22, 1977 2169000600021 vol 3 page 3. 2169000600022 The values given in the NSE,76,148 reference 2169000600023 were corrected by a factor of 0.973 2169000600024 due to a slightly non-linear efficiency of the 2169000600025 Moxon-Rae detector used. 2169000600026 (ASSUM2,79-AU-197(N,G)79-AU-198,,SIG) 2169000600027 The value at 14.75meV was taken from ENDF/B-V, 2169000600028 the values in the keV range are averages of 2169000600029 ENDF/B-V data. 2169000600030 ERR-ANALYS (DATA-ERR) Total error. No details 2169000600031 (MONIT-ERR) Uncertainty of Au standard 2169000600032 REL-REF (R,,B.Goel+,R,BNL-50991,177,1978) 2169000600033 (R,,K.Wisshak+,J,NSE,76,148,1980) 2169000600034 (R,,L.W.Weston+,J,NSE,61,356,1976) 2169000600035 (R,,D.B.Gayther+,C,77KIEV,3,3,1977) 2169000600036 (R,,S.F.Mughabghab+,R,BNL-325,1973) "Neutron Cross 2169000600037 Sections, Resonance Parameters," BNL-325, 3rd ed., 2169000600038 Vol. 1, Brookhaven National Laboratory (1973). 2169000600039 COMMENT The data for the two samples at 29 keV are identical. 2169000600040 ADD-RES The resonance scheme in ref.(see S.F.Mughabghab et.al. 2169000600041 BNL-325) allows authors to deduce an experimental 2169000600042 value ." = 41.5 +- 7 meV, which is an average over 2169000600043 three resonances of unknown spin and parity. 2169000600044 STATUS (TABLE) Tbl.III, IV from Nucl.Sci.Eng.81,396,1982. 2169000600045 (DEP,21690005) 241Am(n,g)242gAm/197Au(n,g)198Au ratio 2169000600046 (SPSDD,21690007) Renormalized. 2169000600047 HISTORY (19820914C) A.P.T. 2169000600048 (19830418U) A.P.T. Keyword 'ASSUMED' corrected 2169000600049 keyword 'MISC-COL' added. 2169000600050 (20101117A) SD: MISC moved to REACTION 2. 2169000600051 Comments from ASSUMED are added to REL-REF 2169000600052 (20121108A) SD: DECAY-DATA was added. Second REACTION 2169000600053 code was corrected (nominator and denominator were 2169000600054 exchanged) 2169000600055 (20201012A) SD: SF9=DERIV added to REACTION code. 2169000600056 STATUS updated. REACTION code (2) moved to 2169000600057 MONITOR (=ASSUM1/ASSUM2). 2169000600058 (20210802A) SD: Subent superseded. 2169000600059 ENDBIB 57 0 2169000600060 NOCOMMON 0 0 2169000600061 DATA 10 3 2169000600062 EN EN-RSL +EN-RSL -EN-RSL DATA DATA-ERR 2169000600063 ASSUM1 ASSUM2 MONIT MONIT-ERR 2169000600064 EV PER-CENT EV EV NO-DIM NO-DIM 2169000600065 B B NO-DIM PER-CENT 2169000600066 1.4750E-02 4. 0.92 0.062169000600067 129.9 0.159 3.2 2169000600068 2.70E+04 1.20E+04 1.0E+04 0.68 0.072169000600069 0.618 2.51 0.246 5.6 2169000600070 2.90E+04 8.0E+03 1.0E+04 0.65 0.052169000600071 0.555 2.32 0.239 5.6 2169000600072 ENDDATA 10 0 2169000600073 ENDSUBENT 72 0 2169000699999 SUBENT 21690007 20210802 23032169000700001 BIB 9 28 2169000700002 REACTION (95-AM-241(N,G)95-AM-242-G/T,,SIG/RAT,,,DERIV) 2169000700003 MONITOR ((79-AU-197(N,G)79-AU-198,,SIG)/ 2169000700004 (95-AM-241(N,G)95-AM-242,,SIG)) 2169000700005 These are not measured but evaluated ratios to derive 2169000700006 the 241Am neutron capture isomeric ratio. 2169000700007 MONIT-REF (,R.Reifarth+,J,EPJ/P,133,424,2018) 2169000700008 ANALYSIS Measured 241Am(n,gamma)242gAm/197Au(n,gamma)198Au 2169000700009 ratio multiplied by evaluated 2169000700010 197Au(n,gamma)198Au/241Am(n,gamma)242Am" 2169000700011 a) cross section value in subentry 21690.006 is 2169000700012 renormalized for new gold cross section folded with 2169000700013 neutron spectrum given in the original reference 2169000700014 (entry ASSUM1) 2169000700015 b) Isomeric Ratio (IR) for En=27 keV unchanged because2169000700016 correction below 1% 2169000700017 Revised data: 2169000700018 Measured quantity: cross section ratio 2169000700019 (241Am->242gAm) /197Au via electron spectra, 2169000700020 normalized by capture cross section ratio 197Au/241Am 2169000700021 CORRECTION Correction for revised gold standard at 2169000700022 En=29 keV: 561/555=1.011 2169000700023 Correction for revised gold standard at 2169000700024 En=27 keV: 620/618 =1.0032169000700025 ASSUMED (ASSUM1,95-AM-241(N,G)95-AM-242,,SIG) 2169000700026 (ASSUM2,79-AU-197(N,G)79-AU-198,,SIG) 2169000700027 ERR-ANALYS (DATA-ERR) total error. no details 2169000700028 STATUS (TABLE) p.33 of INDC(GER)-0053 2169000700029 HISTORY (20210701C) SD 2169000700030 ENDBIB 28 0 2169000700031 NOCOMMON 0 0 2169000700032 DATA 10 3 2169000700033 EN EN-RSL +EN-RSL -EN-RSL DATA DATA-ERR 2169000700034 ASSUM1 ASSUM2 MONIT MONIT-ERR 2169000700035 EV PER-CENT EV EV NO-DIM NO-DIM 2169000700036 B B NO-DIM PER-CENT 2169000700037 1.4750E-02 4. 0.92 0.062169000700038 129.9 0.159 3.2 2169000700039 2.70E+04 1.20E+04 1.0E+04 0.68 0.072169000700040 0.618 2.51 0.246 5.6 2169000700041 2.90E+04 8.0E+03 1.0E+04 0.65 0.052169000700042 0.555 2.32 0.239 5.6 2169000700043 ENDDATA 10 0 2169000700044 ENDSUBENT 43 0 2169000799999 ENDENTRY 7 0 2169099999999