ENTRY 23047 20211106 23052304700000001 SUBENT 23047001 20211106 23052304700100001 BIB 13 53 2304700100002 TITLE Precise measurement of the thermal and stellar 2304700100003 54Fe(n,gamma)55Fe cross sections via accelerator mass 2304700100004 spectrometry 2304700100005 AUTHOR (A.Wallner, K.Buczak, T.Belgya, M.Bichler, L.Coquard, 2304700100006 I.Dillmann, R.Golser, F.Kaeppeler, A.Karakas, 2304700100007 W.Kutschera, C.Lederer, A.Mengoni, M.Pignatari, 2304700100008 A.Priller, R.Reifarth, P.Steier, L.Szentmiklosi) 2304700100009 INSTITUTE (3AULCBR,2AUSVIE,3HUNKFI,2AUSATI,2GERKFK,3AULMOU, 2304700100010 2UK EDG,2ZZZCER,2GERFRK) 2304700100011 (2UK UK) University of Hull, United Kingdom 2304700100012 REFERENCE (J,PR/C,96,025808,2017) - final publ., data. 2304700100013 Data measured at BNC and ATI compiled separately 2304700100014 (see REL-REF) 2304700100015 (R,INDC(GER)-0053,2021) Revised values of Karlsruhe 2304700100016 cross sections. 2304700100017 (C,2006CERN,,(274),2006) Paper number 274. 2304700100018 FACILITY (VDG,2GERKFK) Karlsruhe 3.7MV Van de Graaff accelerator2304700100019 for activation. Beam current 80-90 uA. 2304700100020 REL-REF (O,23394001,A.Wallner+,J,PR/C,96,025808,2017) 2304700100021 Data measured at ATI 2304700100022 (O,31790001,A.Wallner+,J,PR/C,96,025808,2017) 2304700100023 Data for cold neutrons irradiation at Budapest 2304700100024 Neutron Center 2304700100025 INC-SOURCE (P-LI7) Li-7(p,n)Be-7 reaction at kT=25 keV. 2304700100026 30 mum thick layers of metallic Li or 5 mum 2304700100027 layers of LiF on water-cooled Cu backing. Protons of 2304700100028 1912 keV and 2284 keV. 2304700100029 INC-SPECT Quasi-stellar neutron spectrum of kT=25 +- 0.5 keV. 2304700100030 Mean neutron flux during irradiation about 10**9 n/s 2304700100031 at sample position. Neutron flux was determined by 2304700100032 the activity of gold foils. 2304700100033 SAMPLE Two different types of commercially available metallic 2304700100034 Fe powder from Merc (Fe-M) and Alfa Aesar (Fe-A) with 2304700100035 natural abundances ( 5.8% Fe-54) for two irradiations. 2304700100036 Each was sandwiched between two gold foils of the same 2304700100037 diameter. Placed in close geometry to the Li target. 2304700100038 METHOD (ACTIV) Activation technique combined with 2304700100039 (AMS) accelerator mass spectrometry. 2304700100040 Detection of Fe-55 atoms directly via AMS. 2304700100041 Subsequent AMS measurements were done at Vienna 2304700100042 Environmental Research Accelerator (VERA). 2304700100043 Isotopic ratio Z(Fe55)/N(Fe54) was measured. 2304700100044 DETECTOR (GLASD) Li-6 glass detector in 1 m distance from 2304700100045 neutron target - for neutron flux registration in 2304700100046 intervals of 90 s. 2304700100047 ADD-RES Weighted mean of ATI measurement (in EXFOR entry 23394)2304700100048 and BNC measurement (in 31790 entry) of the thermal 2304700100049 cross section: 2.30 +/- 0.07 b. 2304700100050 HISTORY (20090103C) M.M. 2304700100051 (20170825U) SD: Comma was added to ref. 2006CERN. 2304700100052 (20190922A) SD: New ref. added; data updated. 2304700100053 (20200807A) SD: Correction in Subent 005. 2304700100054 (20211106A) SD: Corrections in Subents 002,003. 2304700100055 ENDBIB 53 0 2304700100056 NOCOMMON 0 0 2304700100057 ENDSUBENT 56 0 2304700199999 SUBENT 23047002 20211106 23052304700200001 BIB 8 32 2304700200002 REACTION (26-FE-54(N,G)26-FE-55,,SIG,,SPA) 2304700200003 MONITOR (79-AU-197(N,G)79-AU-198,,SIG,,SPA) 2304700200004 MONIT-REF (22099002,W.Ratynski+,J,PR/C,37,595,1988) 2304700200005 ANALYSIS Activation parameters : 2304700200006 Sample! Activ.! Average ! Thick-! Mass ! Neutron 2304700200007 time(HR) flux ness fluence 2304700200008 10**9/s/cm2 mm mg 10**15/cm2 2304700200009 Fe-1M 251.5hr 0.84 1.8 334.8 0.756+- 0.023 2304700200010 Fe-2A 369.5hr 0.95 2.3 369.5 1.270 +- 0.0382304700200011 Gold 0.03 16.1-16.8 2304700200012 proton energies of 1912 keV 2304700200013 FLAG (1.) Measurement of Fe-1M sample 2304700200014 (2.) Measurement of Fe-2A sample 2304700200015 (3.) Adopted value 2304700200016 ERR-ANALYS (ERR-T) Total uncertainty 2304700200017 (MONIT-ERR) Au cross section 2304700200018 (ERR-1) Mass of Au samples 2304700200019 (ERR-2) Gamma efficiency 2.0% 2304700200020 (ERR-3) Gamma intensity per decay 0.12% 2304700200021 (ERR-4,,0.1) time factors <0.1% 2304700200022 (ERR-5) PTB standard 1.5% 2304700200023 (ERR-6,,1.0) Atom counting <1% 2304700200024 (ERR-7) Fe-56 current 0.6% 2304700200025 (ERR-8) AMS reproducibility 1.5% 2304700200026 STATUS (TABLE) Table IX from Phys.Rev.,C96(2017)025808 2304700200027 (SPSDD,23047004) The dataset superseded by kT=30 keV 2304700200028 value in 23047.004. (NIC-IX values are not based on 2304700200029 an AMS 55Fe-standard but relied on an estimate in the 2304700200030 AMS measurement only, A.Wallner, 2021-11-27). 2304700200031 HISTORY (20190922A) SD: data updated according final publ. 2304700200032 (20211106A) SD: SF8=MXW -> SPA in REACTION code. MONIT 2304700200033 value corrected (639. -> 632. mb). 2304700200034 ENDBIB 32 0 2304700200035 COMMON 10 6 2304700200036 KT-DUMMY KT-ERR MONIT MONIT-ERR ERR-1 ERR-2 2304700200037 ERR-3 ERR-5 ERR-7 ERR-8 2304700200038 KEV KEV MB MB PER-CENT PER-CENT 2304700200039 PER-CENT PER-CENT PER-CENT PER-CENT 2304700200040 25. 5. 632. 9. 0.3 2. 2304700200041 0.12 1.5 0.6 1.5 2304700200042 ENDCOMMON 6 0 2304700200043 DATA 3 3 2304700200044 DATA ERR-T FLAG 2304700200045 MB MB NO-DIM 2304700200046 31.3 1.5 1. 2304700200047 29.6 1.4 2. 2304700200048 30.3 1.2 3. 2304700200049 ENDDATA 5 0 2304700200050 ENDSUBENT 49 0 2304700299999 SUBENT 23047003 20211106 23052304700300001 BIB 8 21 2304700300002 REACTION (26-FE-54(N,G)26-FE-55,,SIG,,MXW,DERIV) 2304700300003 ANALYSIS Derived from measured c-s of Subent 002 using 2304700300004 normalization factor NF. NF was obtained using 2304700300005 evaluated c-s folded with experimental neutron 2304700300006 spectrum of REL-REF and c-s of data bases JEFF-3.1, 2304700300007 JENDL-3.3, ENDF/B-VI.8 (in astrophysically relevant 2304700300008 energy range data are identical). 2304700300009 REL-REF (M,,W.Ratynski+,J,PR/C,37,595,1988) 2304700300010 ASSUMED (ASSUM,26-FE-54(N,G)26-FE-55,,SIG,,MXW,EVAL) 2304700300011 Evaluated c-s value used for NF determination. 2304700300012 MISC-COL (MISC) NF - normalization factor. 2304700300013 FLAG (1.) Measurement of Fe-M1 sample. 2304700300014 (2.) Measurement of Fe-A2 sample. 2304700300015 STATUS (TABLE) Table 1 of 2006CERN,,(274),2006 2304700300016 Data absent in Phys.Rev.,C96(2017)025808 2304700300017 (DEP,23047002) 2304700300018 (SPSDD,23047004) NIC-IX values are not based on an AMS 2304700300019 55Fe-standard but relied on an estimate in the AMS 2304700300020 measurement only, A.Wallner, 2021-11-27 2304700300021 HISTORY (20190922U) SD: STATUS updated. 2304700300022 (20211106A) SD: Subent superseded. 2304700300023 ENDBIB 21 0 2304700300024 COMMON 2 3 2304700300025 KT ASSUM 2304700300026 KEV MB 2304700300027 30. 22.2 2304700300028 ENDCOMMON 3 0 2304700300029 DATA 3 2 2304700300030 DATA MISC FLAG 2304700300031 MB NO-DIM NO-DIM 2304700300032 30.8 0.709 1. 2304700300033 29.8 0.733 2. 2304700300034 ENDDATA 4 0 2304700300035 ENDSUBENT 34 0 2304700399999 SUBENT 23047004 20190922 22822304700400001 BIB 5 12 2304700400002 REACTION (26-FE-54(N,G)26-FE-55,,SIG,,MXW,RECOM) 2304700400003 Recommended MACS values from this work 2304700400004 REL-REF (A,,H.Beer+,J,NP/A,240,29,1975) 2304700400005 (A,,B.J.Allen+,J,NP/A,283,37,1977) 2304700400006 (A,,A.Brusegan+,C,82ANTWER,,127,1982) 2304700400007 ERR-ANALYS (DATA-ERR) The uncertainties are composed of 2304700400008 contributions from the measured spectrum-averaged cross2304700400009 section (4.0%) and from the energy trend, which was 2304700400010 estimated via the differences among the TOF-based MACS 2304700400011 data (0% to 4.5%). 2304700400012 STATUS (TABLE) Table X from Phys.Rev.,C96(2017)025808 2304700400013 HISTORY (20190922A) SD: data updated according final publ. 2304700400014 ENDBIB 12 0 2304700400015 NOCOMMON 0 0 2304700400016 DATA 3 11 2304700400017 KT DATA DATA-ERR 2304700400018 KEV MB MB 2304700400019 5. 102. 5. 2304700400020 10. 57.3 3.1 2304700400021 15. 39.1 2.2 2304700400022 20. 29.9 1.7 2304700400023 25. 24.7 1.3 2304700400024 30. 26.7 1.1 2304700400025 40. 21.2 1.0 2304700400026 50. 17.9 0.9 2304700400027 60. 15.7 0.8 2304700400028 80. 13.3 0.7 2304700400029 100. 11.6 0.6 2304700400030 ENDDATA 13 0 2304700400031 ENDSUBENT 30 0 2304700499999 SUBENT 23047005 20200807 22902304700500001 BIB 7 27 2304700500002 REACTION (26-FE-54(N,G)26-FE-55,,SIG,,SPA) 2304700500003 MONITOR (79-AU-197(N,G)79-AU-198,,SIG) 2304700500004 Spectrum-averaged values 2304700500005 ANALYSIS Activation parameters : 2304700500006 Sample! Activ.! Average ! Thick-! Mass ! Neutron 2304700500007 time(HR) flux ness fluence 2304700500008 10**9/s/cm2 mm mg 10**15/cm2 2304700500009 Fe-3M 54.5hr 6.99 1.4 258.5 1.370+- 0.041 2304700500010 Fe-4A 44.3hr 5.37 1.2 188.4 0.857 +- 0.026 2304700500011 Gold 0.02 11.3-11.8 2304700500012 proton energies of 2284 keV 2304700500013 FLAG (1.) Measurement of Fe-3M sample. 2304700500014 (2.) Measurement of Fe-4A sample. 2304700500015 (3.) Adopted value 2304700500016 ERR-ANALYS (ERR-T) Total uncertainty 2304700500017 (MONIT-ERR) Au cross section 2304700500018 (ERR-1) Mass of Au samples 2304700500019 (ERR-2) Gamma efficiency 2.0% 2304700500020 (ERR-3) Gamma intensity per decay 0.12% 2304700500021 (ERR-4,,0.1) time factors <0.1% 2304700500022 (ERR-5) PTB standard 1.5% 2304700500023 (ERR-6,,1.0) Atom counting <1% 2304700500024 (ERR-7) Fe-56 current 0.6% 2304700500025 (ERR-8) AMS reproducibility 1.5% 2304700500026 STATUS (TABLE) Table IX from Phys.Rev.,C96(2017)025808 2304700500027 HISTORY (20190922C) SD 2304700500028 (20200807A) SD: SF8=MXW -> SPA in REACTION code. 2304700500029 ENDBIB 27 0 2304700500030 COMMON 10 6 2304700500031 EN-MEAN EN-RSL-FW MONIT MONIT-ERR ERR-1 ERR-2 2304700500032 ERR-3 ERR-5 ERR-7 ERR-8 2304700500033 KEV KEV MB MB PER-CENT PER-CENT 2304700500034 PER-CENT PER-CENT PER-CENT PER-CENT 2304700500035 481. 53. 139.0 1.4 0.3 2. 2304700500036 0.12 1.5 0.6 1.5 2304700500037 ENDCOMMON 6 0 2304700500038 DATA 3 3 2304700500039 DATA ERR-T FLAG 2304700500040 MB MB NO-DIM 2304700500041 6.01 0.28 1. 2304700500042 6.02 0.23 2. 2304700500043 6.0 0.2 3. 2304700500044 ENDDATA 5 0 2304700500045 ENDSUBENT 44 0 2304700599999 ENDENTRY 5 0 2304799999999