ENTRY 22971 20211025 23052297100000001 SUBENT 22971001 20211025 23052297100100001 BIB 11 56 2297100100002 TITLE Measurement of (n,gamma) reaction cross sections 2297100100003 at stellar energies for 58Ni and 78Se 2297100100004 AUTHOR (G.Rugel, I.Dillmann, T.Faestermann, M.Heil, 2297100100005 F.Kaeppeler, K.Knie, G.Korschinek, W.Kutschera, 2297100100006 M.Poutivtsev, A.Wallner, 2297100100007 P.Ludwig, L.Fimiani, K.Hain) 2297100100008 REFERENCE (J,NIM/B,259,683,2007) 2297100100009 #doi:10.1016/j.nimb.2007.01.206 2297100100010 (R,INDC(GER)-0053,2021) Revised values of Karlsruhe 2297100100011 cross sections. 2297100100012 Preliminary results for Ni-58 and Se-78 2297100100013 (J,PR/C,95,035803,2017) Final data for Ni-58 2297100100014 #doi:10.1103/PhysRevC.95.035803 2297100100015 First author P.Ludwig. Title: 'Measurement of the 2297100100016 stellar 58Ni(n,gamma)59Ni cross section with 2297100100017 accelerator mass spectrometry' 2297100100018 INSTITUTE (2GERMUN) Fakultaet fuer Physik, Technische Universi- 2297100100019 taet Muenchen, 85747 Garching, Germany. G.Rugel (Cor-2297100100020 responding author, Email address:grugel@ph.tum.de), 2297100100021 T.Faestermann, K.Knie, G.Korschinek, M.Poutivtsev, 2297100100022 A. Wallner, P.Ludwig, L.Fimiani, K.Hain 2297100100023 (2GERKFK) Institut fuer Kernphysik, Forschungszentrum 2297100100024 Karlsruhe, Germany. I.Dillmann, M.Heil,F.Kaeppeler 2297100100025 (2SWTBAS) Department fuer Physik und Astronomie, 2297100100026 Universitaet Basel, Switzerland. I.Dillmann 2297100100027 (2AUSIRK) Vienna Environmental Research Accelerator 2297100100028 (VERA), Institut fuer Isotopenforschung und Kernphys. 2297100100029 A-1090 Wien, Austria. W. Kutschera, A. Wallner 2297100100030 FACILITY (VDG,2GERKFK) 3.7 MV Van de Graaff accelerator, 2297100100031 average beam current 100 uA, proton energy 2297100100032 1912 keV, 30 keV above reaction Li-7(p,n)Be-7 2297100100033 INC-SOURCE (P-LI7) Protons bombarding um thick metallic 2297100100034 lithium layer on copper water-cooled backing 2297100100035 INC-SPECT Quasi-stellar near-Maxwellian distribution with kT = 2297100100036 25+-0.5 keV and maximal neutron energy 106 keV. 2297100100037 METHOD (ACTIV) Auxiliary activation method for neutron flux 2297100100038 determination with the help of Au-197(n,gamma) 2297100100039 (AMS) Accelerator mass spectrometry performed on the 2297100100040 AMS system at the Munich MUN Institute 2297100100041 (TOF) For accelerator mass separation 2297100100042 Samples were sandwiched between 10-30 um thick gold 2297100100043 foils in close geometry to Li-7 target 2297100100044 MONITOR (79-AU-197(N,G)79-AU-198,,SIG,,SPA) 2297100100045 REL-REF (R,,Z.Chunmei,J,NDS,95,59,2002) Decay constants for 2297100100046 monitor Au-197 2297100100047 (M,22959001,H.Nassar+,J,PRL,94,092504,2005) Details of 2297100100048 experiment and AMS method analysis 2297100100049 HISTORY (20071014C) SM 2297100100050 (20120120A) NDS(VZ): REL-REF: ND/B->NDS 2297100100051 (20170404A) M.M. Ref. PR/C,95,035803,2017 was added. 2297100100052 Subents 004-005 were added 2297100100053 (20190320U) SD: Second title moved under second ref. 2297100100054 in Subent 001. Pointers used in TITLE and REF. deleted2297100100055 (20200120U) SD: SAMPLE corrected in Subent 002. 2297100100056 (20211025A) SD: Corrections in several Subents. 2297100100057 Subent 006 added. 2297100100058 ENDBIB 56 0 2297100100059 NOCOMMON 0 0 2297100100060 ENDSUBENT 59 0 2297100199999 SUBENT 22971002 20200120 22852297100200001 BIB 9 24 2297100200002 REACTION (28-NI-58(N,G)28-NI-59,,SIG,,SPA) 2297100200003 SAMPLE Natural metallic Nickel sample, Ni-58 content is 2297100200004 68.077%. Mass 47.3 milligram, Ni-58 number 3.30E+20 2297100200005 (28-NI-58,NAT=0.68077) 2297100200006 MONIT-REF (,W.Ratynski+,J,PR/C,37,595,1988) 2297100200007 DECAY-MON (79-AU-198-G,2.69517D,DG,412.,0.9558) 2297100200008 ASSUMED (ASSUM1,28-NI-58(N,G)28-NI-59,,SIG) For thermal 2297100200009 neutrons 2297100200010 (ASSUM2,28-NI-64(N,G)28-NI-65,,SIG) For thermal 2297100200011 neutrons 2297100200012 REL-REF (R,13947002,S.Raman+,J,PR/C,70,044318,2004) 2297100200013 Ni-58 (n,gamma) thermal cross sections 2297100200014 (R,20625016,E.M.Gryntakis+,J,JRC,46,159,1978) 2297100200015 Ni-64 (n,gamma) thermal cross sections 2297100200016 (D,V0102085,Z.Y.Bao+,J,AND,76,70,2000) 2297100200017 ERR-ANALYS (ERR-T) Includes statistical, standard and 2297100200018 systematical uncertainties. 2297100200019 (ERR-1) Time-integrated neutron flux error 2297100200020 STATUS (PRELM) By the authors 2297100200021 (TABLE) Table 2 of Nucl.Instrum.Meth.,B259(2007)683 2297100200022 (SPSDD,22971004) Superseded by newer data. 2297100200023 HISTORY (20170404A) M.M. ERR-ANALYS, SPSDD were added. 2297100200024 MXW -> SPA . REL-REF of E.M.Gryntakis+ was added. 2297100200025 (20200120U) SD: SAMPLE corrected. 2297100200026 ENDBIB 24 0 2297100200027 COMMON 3 3 2297100200028 KT KT-ERR ERR-1 2297100200029 KEV KEV PER-CENT 2297100200030 25. 0.5 3. 2297100200031 ENDCOMMON 3 0 2297100200032 DATA 6 1 2297100200033 DATA ERR-T ASSUM1 ASSUM1-ERR ASSUM2 ASSUM2-ERR 2297100200034 MB MB MB MB MB MB 2297100200035 27.2 2.1 4.13 0.05 1.52 0.03 2297100200036 ENDDATA 3 0 2297100200037 ENDSUBENT 36 0 2297100299999 SUBENT 22971003 20211025 23052297100300001 BIB 9 22 2297100300002 REACTION (34-SE-78(N,G)34-SE-79,,SIG,,SPA) 2297100300003 SAMPLE Cd-Se compound, mass 216.8 milligram, Se-78 1.62E+20 2297100300004 Se-78 content 23.77%, Se-74 content 0.87%, 2297100300005 Se-80 - 46.9% 2297100300006 Second sample was enriched to 98.8% in Se-78 and 2297100300007 depleted to 0.01% in Se-74 - used at AMS 2297100300008 MONIT-REF (22099002,W.Ratynski+,J,PR/C,37,595,1988) 2297100300009 DECAY-MON (79-AU-198-G,2.69517D,DG,412.,0.9558) 2297100300010 ASSUMED (ASSUM,34-SE-78(N,G)34-SE-79,,SIG) For thermal neutrons2297100300011 REL-REF (R,,S.F.Mughabghab+,B,NEUT.CS 1A,,,1981) Se-78(n,gamma)2297100300012 cross section for thermal neutrons 2297100300013 (D,,Z.Y.Bao+,J,AND,76,70,2000) 2297100300014 ERR-ANALYS (DATA-ERR) Not specified 2297100300015 (ERR-1) Time-integrated neutron flux error 2297100300016 (MONIT-ERR) Uncertainty in monitor reaction 2297100300017 STATUS (TABLE) Table 2 of Nucl.Instrum.Meth.,B259(2007)683 2297100300018 (SPSDD,22971006) Renormalized. 2297100300019 HISTORY (20170404A) M.M.Correction of free text and ERR-ANALYS.2297100300020 ASSUM value corrected as given on page 686. 2297100300021 MXW -> SPA. 2297100300022 (20211025A) SD: KT -> KT-DUMMY. MONIT/ERR added. 2297100300023 Subent superseded. 2297100300024 ENDBIB 22 0 2297100300025 COMMON 5 3 2297100300026 KT-DUMMY KT-ERR ERR-1 MONIT MONIT-ERR 2297100300027 KEV KEV PER-CENT MB MB 2297100300028 25. 0.5 3. 586. 8. 2297100300029 ENDCOMMON 3 0 2297100300030 DATA 4 1 2297100300031 DATA DATA-ERR ASSUM ASSUM-ERR 2297100300032 MB MB MB MB 2297100300033 61. 10. 0.43 0.02 2297100300034 ENDDATA 3 0 2297100300035 ENDSUBENT 34 0 2297100399999 SUBENT 22971004 20211025 23052297100400001 BIB 8 33 2297100400002 REACTION (28-NI-58(N,G)28-NI-59,,SIG,,SPA) 2297100400003 SAMPLE Natural nickel metallic powder three samples. 2297100400004 Two samples were irradiated ~ 6 days at first run 2297100400005 3rd sample irradiated ~5 days three years later. 2297100400006 Sample N(Ni58) Diameter Flux-total 2297100400007 10**20atoms mm 10**14 n 2297100400008 Ni-1 1.652 8 8.73 2297100400009 Ni-2 1.649 8 8.50 2297100400010 Ni-3 5.307 6 9.23 2297100400011 DECAY-MON (79-AU-198-G,2.6941D,DG,411.8,0.9558) 95.58+-0.12% 2297100400012 CORRECTION For self-absorption in Au samples - factor 0.995 2297100400013 For decay during irradiation and variations in the 2297100400014 neutron flux. 2297100400015 FLAG (1.) Measurement by sample Ni-1 2297100400016 (2.) Measurement by sample Ni-2 2297100400017 (3.) Measurement by sample Ni-3 2297100400018 (4.) Weighted average of three sample runs 2297100400019 ERR-ANALYS (ERR-T) Total uncertainty propagated from 2297100400020 (ERR-SYS) Systematic uncertainty due to 2297100400021 - 197Au cross section (1.4%) 2297100400022 - Detector efficiency (2.0%) 2297100400023 - 198Au gamma ray intensity (0.13%) 2297100400024 - AMS standard (4.1%) 2297100400025 - 2297100400026 (ERR-S) Statistical uncertainty due to 2297100400027 - Sample position in activation (1.5%) 2297100400028 - Sample mass (197Au) (0.3%) 2297100400029 - counting statistics (198Au) (0.25%) 2297100400030 - statistical error (Ni-1,N-2,Ni-3) 2297100400031 -(5.5-13.5%) 2297100400032 (MONIT-ERR) Uncertainty in monitor reaction 2297100400033 STATUS (TABLE) Table V from Phys.Rev.,C95(2017)035803 2297100400034 HISTORY (20211025A) SD: KT -> KT-DUMMY. 2297100400035 ENDBIB 33 0 2297100400036 COMMON 4 3 2297100400037 KT-DUMMY KT-ERR MONIT MONIT-ERR 2297100400038 KEV KEV MB MB 2297100400039 25. 0.5 632. 9. 2297100400040 ENDCOMMON 3 0 2297100400041 DATA 4 4 2297100400042 DATA ERR-SYS ERR-S FLAG 2297100400043 MB MB MB NO-DIM 2297100400044 30.4 2.3 4.1 1. 2297100400045 29.0 2.2 1.1 2. 2297100400046 32.2 2.5 1.8 3. 2297100400047 29.9 2.3 0.9 4. 2297100400048 ENDDATA 6 0 2297100400049 ENDSUBENT 48 0 2297100499999 SUBENT 22971005 20211025 23052297100500001 BIB 6 16 2297100500002 REACTION (28-NI-58(N,G)28-NI-59,,SIG,,MXW) 2297100500003 ANALYSIS Multiplication of ENDF/B-VII.1 kT=30 keV MACS by 2297100500004 0.90, which the ratio of the measured kT=25 keV 2297100500005 SACS (29.9 mb) to the ENDF/B-VII.1 kT=25 keV 2297100500006 SACS (33.3 mb). 2297100500007 ERR-ANALYS (ERR-S) Total statistical 2297100500008 (ERR-SYS) Total systematical 2297100500009 ADD-RES Calculated MACS using ENDF/B-VII.1 : 2297100500010 kT,keV MACS kT,keV MACS 2297100500011 5. 34.7 40. 26.7 2297100500012 10. 43.2 50. 24.2 2297100500013 15. 40.1 60. 22.2 2297100500014 20. 36.2 80. 19.5 2297100500015 25. 32.9 100. 17.5 2297100500016 STATUS (TABLE) Table VII of Phys.Rev.,C95(2017)035803 2297100500017 HISTORY (20211025A) SD: ASSUMED deleted. 2297100500018 ENDBIB 16 0 2297100500019 NOCOMMON 0 0 2297100500020 DATA 4 1 2297100500021 KT DATA ERR-SYS ERR-S 2297100500022 KEV MB MB MB 2297100500023 30. 30.4 2.3 0.9 2297100500024 ENDDATA 3 0 2297100500025 ENDSUBENT 24 0 2297100599999 SUBENT 22971006 20211025 23052297100600001 BIB 11 21 2297100600002 REACTION 1((34-SE-78(N,G)34-SE-79,,SIG,,SPA)/ 2297100600003 (79-AU-197(N,G)79-AU-198,,SIG,,SPA)) 2297100600004 2(34-SE-78(N,G)34-SE-79,,SIG,,SPA) 2297100600005 SAMPLE Cd-Se compound, mass 216.8 milligram, Se-78 1.62E+20 2297100600006 Se-78 content 23.77%, Se-74 content 0.87%, 2297100600007 Se-80 - 46.9% 2297100600008 Second sample was enriched to 98.8% in Se-78 and 2297100600009 depleted to 0.01% in Se-74 - used at AMS 2297100600010 ANALYSIS Cross section value in Subent 22971.003 is 2297100600011 renormalized for new gold cross section 2297100600012 DECAY-MON (79-AU-198-G,3881.0MIN,DG,411.80,0.9558) 2297100600013 MONIT-REF (,R.Reifarth+,J,EPJ/P,133,424,2018) 2297100600014 CORRECTION Correction for revised gold standard: 622.7/586 =1.0622297100600015 ASSUMED (ASSUM,34-SE-78(N,G)34-SE-79,,SIG) For thermal neutrons2297100600016 REL-REF (R,,S.F.Mughabghab+,B,NEUT.CS 1A,,,1981) Se-78(n,gamma)2297100600017 cross section for thermal neutrons 2297100600018 ERR-ANALYS (DATA-ERR) Not specified 2297100600019 (ERR-1) Time-integrated neutron flux error 2297100600020 (MONIT-ERR) Uncertainty in monitor reaction 2297100600021 STATUS (TABLE) Table on p.253 of INDC(GER)-0053 2297100600022 HISTORY (20170404C) SD 2297100600023 ENDBIB 21 0 2297100600024 COMMON 5 3 2297100600025 KT-DUMMY KT-ERR ERR-1 MONIT MONIT-ERR 2297100600026 KEV KEV PER-CENT MB MB 2297100600027 25. 0.5 3. 622.7 6. 2297100600028 ENDCOMMON 3 0 2297100600029 DATA 6 1 2297100600030 DATA 1DATA-ERR 1DATA 2DATA-ERR 2ASSUM ASSUM-ERR 2297100600031 NO-DIM NO-DIM MB MB MB MB 2297100600032 0.104 0.017 65. 11. 0.43 0.02 2297100600033 ENDDATA 3 0 2297100600034 ENDSUBENT 33 0 2297100699999 ENDENTRY 6 0 2297199999999