ENTRY 22459 20210924 23042245900000001 SUBENT 22459001 20210924 23042245900100001 BIB 11 35 2245900100002 TITLE Stellar (n,gamma) cross section of the unstable 2245900100003 isotope 155Eu 2245900100004 AUTHOR (S.Jaag, F.Kaeppeler, F.Foss, K.Wisshak) 2245900100005 INSTITUTE (2GERKFK) 2245900100006 REFERENCE (J,PR/C,51,3465,1995) 2245900100007 (R,INDC(GER)-0053,2021) Revised values of Karlsruhe 2245900100008 cross sections. 2245900100009 ((S,ISINN-4,148,1996)=(S,JINR-E3-96-336,148,1996)) 2245900100010 First author F.Kaeppeler . Preliminary publication. 2245900100011 FACILITY (VDG,2GERKFK) Pulsed Van-de-Graaff accelerator, beam 2245900100012 current 2 micro-A, pulse width 0.7 ns, repetition rate2245900100013 250 kHz 2245900100014 INC-SOURCE (P-LI7) 2245900100015 METHOD (ACTIV) Irradiation time 17 days 2245900100016 DETECTOR (HPGE) Measurement of induced activity during 29 days 2245900100017 started directly after irradiation. 2245900100018 175 cm3 volume, well shielded . The sample was 2245900100019 positioned directly on Be window of detector. 2245900100020 Detection efficiency dependence from E-gamma was 2245900100021 determined via standard gamma-sources - Am241,Cd109, 2245900100022 Sn113,Cs137,Mn54,Zn65,Eu152,Y88,Th228 . 2245900100023 (GLASD) 6LI glass neutron monitor to measure time 2245900100024 dependence of neutron flux during activation. 2245900100025 SAMPLE 155Eu was prepared from enriched (98.6%) 154Sm sample 2245900100026 after breeding in a thermal reactor and following 2245900100027 Eu/Sm separation. The final sample 155-Eu consists of2245900100028 ~88 nanogram 155Eu, (3.36+-0.13)*10**14 atoms. 2245900100029 155Eu sample was sandwiched between two 0.03 mm thick2245900100030 gold foils and mounted directly on the neutron target2245900100031 CORRECTION For self-absorption. 2245900100032 HISTORY (20000304C) + + Compiled by S.Maev + + 2245900100033 (20090506U) JINR-E3 updated with ISINN . 2245900100034 (20161025A) M.M. Ref. J,PR/C,51,3465,1995 was added. 2245900100035 BIB information was updated. Subents 003-005 were added2245900100036 (20210924A) SD: 002, 005 superseded, 006,007 added. 2245900100037 ENDBIB 35 0 2245900100038 NOCOMMON 0 0 2245900100039 ENDSUBENT 38 0 2245900199999 SUBENT 22459002 20210924 23042245900200001 BIB 10 49 2245900200002 REACTION (63-EU-155(N,G)63-EU-156,,SIG,,MXW) 2245900200003 INC-SPECT Quasi-Maxwellian neutron spectrum of kT=25keV . 2245900200004 Integrated neutron flux 1*10**9 1/sec was determined 2245900200005 from activities of the gold foils. 2245900200006 MONITOR (79-AU-197(N,G)79-AU-198,,SIG,,MXW) 2245900200007 MONIT-REF (,W.Ratynski+,J,PR/C,37,595,1988) 2245900200008 DECAY-MON (79-AU-198-G,2.696D,DG,411.8,0.955) 2245900200009 2.696+-0.002 d , 95.5+-0.1 % . 2245900200010 DECAY-DATA (63-EU-155,4.68YR,DG) 2245900200011 4.68+-0.04 yr. 2245900200012 (63-EU-156,15.19D,DG) 2245900200013 15.19+-0.08 d . 2245900200014 ANALYSIS Weighted average of two ratio values obtained by two 2245900200015 sets of gamma line intensities were used to 2245900200016 determine the cross section. 2245900200017 EPS- detector efficiencies, 2245900200018 P - correction factor for pileup, 2245900200019 C - correction factor for cascade summing. 2245900200020 Gamma-line EPS P C Counts 2245900200021 646.3 keV 0.05442 0.975 0.813 2596+-117 2245900200022 811.8 keV 0.04556 0.975 0.811 3155+-117 2245900200023 1079.2 keV 0.03645 0.976 0.977 1342+-64 2245900200024 1876.9 keV 0.02367 0.98 1.724 614+-38 2245900200025 1937.6 keV 0.02317 0.98 1.011 367+-32 2245900200026 1965.9 keV 0.02295 0.98 1.147 926+-42 2245900200027 2026.6 keV 0.02250 0.98 1.001 623+-36 2245900200028 2097.8 keV 0.02199 0.98 1.036 793+-31 2245900200029 2180.9 keV 0.02144 0.98 1.017 415+-32 2245900200030 2186.8 keV 0.02140 0.98 1.012 637+-29 2245900200031 2269.9 keV 0.02088 0.98 1.012 201+-20 2245900200032 ERR-ANALYS (ERR-T) Total uncertainty. 2245900200033 (ERR-1) Total error in neutron flux - 2.5%, mainly due 2245900200034 to Au CS - 1.5%, flux detector efficiency - 1.5% . 2245900200035 (ERR-2) Gamma-lines detector efficiency - 2%, 2245900200036 (ERR-3) Correction for pileup - 0.2 % 2245900200037 (ERR-4) Correction for cascade summing - 1.% 2245900200038 (ERR-5) Conservative estimate corresponding to the 2245900200039 total truncation correction of either isotope - 2% 2245900200040 STATUS (TABLE) Text, page 3470 of J,PR/C,51,3465,1995 2245900200041 Text,page 153 ISINN-4,148,1996 - 1490+-90mb at 25keV .2245900200042 (DEP,22459003) Measured ratio Eu/Au via gamma 2245900200043 intensities of Helmer . 2245900200044 (DEP,22459004) Measured ratio Eu/Au via gamma 2245900200045 intensities of Browne+ . 2245900200046 (SPSDD,22459006) Renormalized. 2245900200047 HISTORY (20090506U) EN-MEAN changed to KT 2245900200048 (20161025A) M.M. Value 1490 -> 1470 mb. 2245900200049 MONIT value was added. 2245900200050 (20210924A) SD: MONIT added. Subent superseded. 2245900200051 ENDBIB 49 0 2245900200052 COMMON 5 3 2245900200053 ERR-1 ERR-2 ERR-3 ERR-4 ERR-5 2245900200054 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 2245900200055 2.5 2. 0.2 1. 2. 2245900200056 ENDCOMMON 3 0 2245900200057 DATA 5 1 2245900200058 KT DATA ERR-T MONIT MONIT-ERR 2245900200059 KEV MB MB MB MB 2245900200060 25. 1470. 90. 648. 10. 2245900200061 ENDDATA 3 0 2245900200062 ENDSUBENT 61 0 2245900299999 SUBENT 22459003 20161025 22552245900300001 BIB 7 36 2245900300002 REACTION ((63-EU-155(N,G)63-EU-156,,SIG,,MXW)/ 2245900300003 (79-AU-197(N,G)79-AU-198,,SIG,,MXW)) 2245900300004 INC-SPECT Quasi-Maxwellian neutron spectrum of kT=25keV . 2245900300005 Integrated neutron flux 1*10**9 1/sec was determined 2245900300006 from activities of the gold foils. 2245900300007 DECAY-DATA (63-EU-155,4.68YR,DG) 2245900300008 4.68+-0.04 yr. 1.214+-0.10%, 21.84+-0.33 %, 2245900300009 for absolute uncertainties add 2.0% . 2245900300010 (63-EU-156,15.19D,DG,646.3,0.06279, 2245900300011 DG,811.8,0.09700, 2245900300012 DG,1079.2,0.04589, 2245900300013 DG,1876.9,0.01512, 2245900300014 DG,1937.6,0.01944, 2245900300015 DG,1965.9,0.03870, 2245900300016 DG,2026.6,0.03272, 2245900300017 DG,2097.8,0.03809, 2245900300018 DG,2180.9,0.02142, 2245900300019 DG,2186.8,0.03485, 2245900300020 DG,2269.9,0.01030) 2245900300021 15.19+-0.08 d . 2245900300022 646.3keV - 6.279+-0.027 % , 2245900300023 811.8keV - 9.700+-0.040 % , 2245900300024 1079.2keV - 4.589+-0.018 % , 2245900300025 1876.9keV - 1.512+-0.012 % , 2245900300026 1937.6keV - 1.944+-0.014 % , 2245900300027 1965.9keV - 3.870+-0.019 % , 2245900300028 2026.6keV - 3.272+-0.016 % , 2245900300029 2097.8keV - 3.809+-0.018 % , 2245900300030 2180.9keV - 2.142+-0.013 % , 2245900300031 2186.8keV - 3.485+-0.017 % , 2245900300032 2269.9keV - 1.030+-0.008 . 2245900300033 REL-REF (R,,R.G.Helmer,J,NDS,49,383,1986) Decay data for Eu-1562245900300034 STATUS (TABLE) Text,page 3470 of J,PR/C,51,3465,1995 2245900300035 ERR-ANALYS (DATA-ERR) Type of uncertainty is not explained in the 2245900300036 article. 2245900300037 HISTORY (20161025C) M.M. Subent was added. 2245900300038 ENDBIB 36 0 2245900300039 NOCOMMON 0 0 2245900300040 DATA 3 1 2245900300041 KT DATA DATA-ERR 2245900300042 KEV NO-DIM NO-DIM 2245900300043 25. 2.39 0.23 2245900300044 ENDDATA 3 0 2245900300045 ENDSUBENT 44 0 2245900399999 SUBENT 22459004 20161025 22552245900400001 BIB 7 36 2245900400002 REACTION ((63-EU-155(N,G)63-EU-156,,SIG,,MXW)/ 2245900400003 (79-AU-197(N,G)79-AU-198,,SIG,,MXW)) 2245900400004 INC-SPECT Quasi-Maxwellian neutron spectrum of kT=25keV . 2245900400005 Integrated neutron flux 1*10**9 1/sec was determined 2245900400006 from activities of the gold foils. 2245900400007 DECAY-DATA (63-EU-155,4.68YR,DG) 2245900400008 4.68+-0.04 yr. 1.214+-0.10%, 21.84+-0.33 %, 2245900400009 for absolute uncertainties add 2.0% . 2245900400010 (63-EU-156,15.19D,DG,646.3,0.070, 2245900400011 DG,811.8,0.102, 2245900400012 DG,1079.2,0.048, 2245900400013 DG,1876.9,0.0169, 2245900400014 DG,1937.6,0.021, 2245900400015 DG,1965.9,0.0412, 2245900400016 DG,2026.6,0.0347, 2245900400017 DG,2097.8,0.0419, 2245900400018 DG,2180.9,0.0239, 2245900400019 DG,2186.8,0.039, 2245900400020 DG,2269.9,0.0110) 2245900400021 15.19+-0.08 d . 2245900400022 646.3keV - 7.0+-0.3 % , 2245900400023 811.8keV - 10.2+-0.0 % , 2245900400024 1079.2keV - 4.8+-0.4 % , 2245900400025 1876.9keV - 1.69+-0.07 % , 2245900400026 1937.6keV - 2.1+-0.1 % , 2245900400027 1965.9keV - 4.12+-0.17 % , 2245900400028 2026.6keV - 3.47+-0.14 % , 2245900400029 2097.8keV - 4.19+-0.15 % , 2245900400030 2180.9keV - 2.39+-0.10 % , 2245900400031 2186.8keV - 3.9+-0.4 % , 2245900400032 2269.9keV - 1.10+-0.04 . 2245900400033 REL-REF (R,,E.Browne+,B,BROWNE,,1986) Decay data for Eu-156. 2245900400034 STATUS (TABLE) Text,page 3470 of J,PR/C,51,3465,1995 2245900400035 ERR-ANALYS (DATA-ERR) Type of uncertainty is not explained in the 2245900400036 article. 2245900400037 HISTORY (20161025C) M.M. Subent was added. 2245900400038 ENDBIB 36 0 2245900400039 NOCOMMON 0 0 2245900400040 DATA 3 1 2245900400041 KT DATA DATA-ERR 2245900400042 KEV NO-DIM NO-DIM 2245900400043 25. 2.22 0.16 2245900400044 ENDDATA 3 0 2245900400045 ENDSUBENT 44 0 2245900499999 SUBENT 22459005 20210924 23042245900500001 BIB 6 12 2245900500002 REACTION (63-EU-155(N,G)63-EU-156,,SIG,,MXW,DERIV) 2245900500003 ANALYSIS CS was determined by extrapolation of CS at kT=25keV .2245900500004 ERR-ANALYS (ERR-T) Total uncertainty. 2245900500005 (ERR-5) Uncertainty in correction on the energy 2245900500006 dependence at extrapolation. 2245900500007 STATUS (TABLE) Text, page 3470 of J,PR/C,51,3465,1995 2245900500008 (DEP,22459002) Measured CS at kT=25 keV. 2245900500009 (SPSDD,22459007) Renormalized. 2245900500010 REL-REF (D,,J.A.Holmes+,J,AND,18,305,1976) 1730mb 2245900500011 (D,,M.J.Harris,J,ASP,77,357,1981) 2088mb 2245900500012 HISTORY (20161025C) M.M. Subent was added. 2245900500013 (20210924A) SD: Subent superseded. 2245900500014 ENDBIB 12 0 2245900500015 NOCOMMON 0 0 2245900500016 DATA 6 1 2245900500017 KT DATA ERR-T ERR-5 MONIT MONIT-ERR 2245900500018 KEV MB MB PER-CENT MB MB 2245900500019 30. 1320. 84. 3. 648. 10. 2245900500020 ENDDATA 3 0 2245900500021 ENDSUBENT 20 0 2245900599999 SUBENT 22459006 20210924 23042245900600001 BIB 11 34 2245900600002 REACTION 1((63-EU-155(N,G)63-EU-156,,SIG,,MXW)/ 2245900600003 (79-AU-197(N,G)79-AU-198,,SIG,,MXW)) 2245900600004 2(63-EU-155(N,G)63-EU-156,,SIG,,MXW) 2245900600005 INC-SPECT Quasi-Maxwellian neutron spectrum of kT=25keV . 2245900600006 Integrated neutron flux 1*10**9 1/sec was determined 2245900600007 from activities of the gold foils. 2245900600008 MONITOR (79-AU-197(N,G)79-AU-198,,SIG,,MXW) 2245900600009 DECAY-MON (79-AU-198-G,3881.0MIN,DG,411.80,0.9558) 2245900600010 MONIT-REF (,R.Reifarth+,J,EPJ/P,133,424,2018) 2245900600011 DECAY-DATA (63-EU-155,4.753YR) 2245900600012 (63-EU-156,15.19D,DG,60.0,0.01175, 2245900600013 DG,86.5,0.307, 2245900600014 DG,105.3,0.211) 2245900600015 ANALYSIS Cross section value in Subent 22459.002 is 2245900600016 renormalized 2245900600017 a) for new gold cross section 2245900600018 b) for new 155Eu half-life of 4.753 yr by factor 2245900600019 4.68/4.753=0.984 2245900600020 c) for new gamma-intensities of 155Eu: replacing the 2245900600021 average adopted in original paper for a set of 2245900600022 gamma-lines by data from NDS/ENSDF 2020 yields a 2245900600023 correction factor of 1.054 2245900600024 d) for new gamma-intensities of 156Eu: replacing the 2245900600025 average adopted in original paper for a set of 2245900600026 gamma-lines by data from NDS/ENSDF 2020 yields a 2245900600027 correction factor of 1.038 2245900600028 CORRECTION Correction for revised gold standard: 681/648 =1.051 2245900600029 ERR-ANALYS (ERR-T) Total uncertainty. 2245900600030 (ERR-1) Total error in neutron flux - 2.5%, mainly due 2245900600031 to Au CS - 1.5%, flux detector efficiency - 1.5% . 2245900600032 (ERR-3) Correction for pileup - 0.2 % 2245900600033 (ERR-4) Correction for cascade summing - 1.% 2245900600034 STATUS (TABLE) p.101 of INDC(GER)-0053 2245900600035 HISTORY (20210924C) SD 2245900600036 ENDBIB 34 0 2245900600037 COMMON 3 3 2245900600038 ERR-1 ERR-3 ERR-4 2245900600039 PER-CENT PER-CENT PER-CENT 2245900600040 2.5 0.2 1. 2245900600041 ENDCOMMON 3 0 2245900600042 DATA 7 1 2245900600043 KT DATA 1ERR-T 1DATA 2ERR-T 2MONIT 2245900600044 MONIT-ERR 2245900600045 KEV NO-DIM NO-DIM MB MB MB 2245900600046 MB 2245900600047 25. 2.269 0.139 1662. 100. 681. 2245900600048 7. 2245900600049 ENDDATA 6 0 2245900600050 ENDSUBENT 49 0 2245900699999 SUBENT 22459007 20210924 23042245900700001 BIB 6 22 2245900700002 REACTION (63-EU-155(N,G)63-EU-156,,SIG,,MXW,DERIV) 2245900700003 ANALYSIS CS was determined by extrapolation of CS at kT=25keV 2245900700004 Cross section value in Subent 22459.002 is 2245900700005 renormalized 2245900700006 a) for new gold cross section 2245900700007 b) for new 155Eu half-life of 4.753 yr by factor 2245900700008 4.68/4.753=0.984 2245900700009 c) for new gamma-intensities of 155Eu: replacing the 2245900700010 average adopted in original paper for a set of 2245900700011 gamma-lines by data from NDS/ENSDF 2020 yields a 2245900700012 correction factor of 1.054 2245900700013 d) for new gamma-intensities of 156Eu: replacing the 2245900700014 average adopted in original paper for a set of 2245900700015 gamma-lines by data from NDS/ENSDF 2020 yields a 2245900700016 correction factor of 1.038 2245900700017 CORRECTION Correction for revised gold standard: 681/648 =1.051 2245900700018 ERR-ANALYS (ERR-T) Total uncertainty. 2245900700019 (ERR-5) Uncertainty in correction on the energy 2245900700020 dependence at extrapolation. 2245900700021 STATUS (TABLE) p.102 of INDC(GER)-0053 2245900700022 (DEP,22459005) Measured CS at kT=25 keV, normalized. 2245900700023 HISTORY (20210924C) SD 2245900700024 ENDBIB 22 0 2245900700025 NOCOMMON 0 0 2245900700026 DATA 4 1 2245900700027 KT DATA ERR-T ERR-5 2245900700028 KEV MB MB PER-CENT 2245900700029 30. 1493. 94. 6.3 2245900700030 ENDDATA 3 0 2245900700031 ENDSUBENT 30 0 2245900799999 ENDENTRY 7 0 2245999999999