ENTRY 23394 20220218 23102339400000001 SUBENT 23394001 20220218 23102339400100001 BIB 16 58 2339400100002 TITLE Precise measurement of the thermal and stellar 2339400100003 Fe54(n,g)Fe55 cross sections via accelerator mass 2339400100004 spectrometry 2339400100005 REFERENCE (J,PR/C,96,025808,2017) 2339400100006 #doi:10.1103/PhysRevC.96.025808 2339400100007 AUTHOR (A.Wallner, K.Buczak, T.Belgya, M.Bichler, L.Coquard, 2339400100008 I.Dillmann, R.Golser,F.Kaeppeler,A.Karakas,W.Kutschera,2339400100009 C.Lederer, A.Mengoni, M.Pignatari,A.Priller,R.Reifarth,2339400100010 P.Steier, L.Szentmiklosi) 2339400100011 INSTITUTE (3AULCBR) A.Wallner 2339400100012 (2AUSVIE) VERA laboratory 2339400100013 A.Wallner,K.Buczak,R.Golser,W.Kutschera,C.Lederer, 2339400100014 A.Priller,P.Steier 2339400100015 (3HUNKFI) T.Belgya,L.Szentmiklosi 2339400100016 (2AUSATI) M.Bichler 2339400100017 (2GERKFK) L.Coquard,I.Dillmann,F.Kaeppeler 2339400100018 (3AULMOU) A.Karakas 2339400100019 (2UK EDG) A.Karakas,C.Lederer 2339400100020 (2ZZZCER) A.Mengoni 2339400100021 (2UK UK) E.A. Milne Centre for Astrophysics, Dept. of 2339400100022 Physics and Mathematics, University of Hull, UK 2339400100023 M.Pignatari 2339400100024 (2GERFRK) R.Reifarth 2339400100025 REL-REF (O,31790001,A.Wallner+,J,PR/C,96,025808,2017) 2339400100026 Data for cold neutrons irradiation at Budapest 2339400100027 Neutron Center 2339400100028 (O,23047001,A.Wallner+,J,PR/C,96,025808,2017) 2339400100029 Data for Karlsruhe 3.7MV Van de Graaff irradiation 2339400100030 (R,,S.K.Basu+,J,NDS,111,2555,2010) Decay data for Zr-92339400100031 FACILITY (REAC,2AUSATI) TRIGA Mark-II reactor 2339400100032 INC-SOURCE (REAC) 2339400100033 INC-SPECT Thermal neutrons kT=25 meV, 300 K . 2339400100034 The neutron flux ~3.7E+11 /cm2/sec . 2339400100035 Thermal-to-epithermal flux ratio 76. - verified via Zr 2339400100036 standard method. 2339400100037 Flux variation up to 5%. 2339400100038 SAMPLE Metal powder of natural Fe, ~500 mg, encapsulated in 2339400100039 plastic vials. 2339400100040 (26-FE-54,NAT=0.05845) 5.845+-0.035 % 2339400100041 (26-FE-56,NAT=0.91754) 91.754+-0.036 % 2339400100042 METHOD (ACTIV) Four irradiations : 2339400100043 Sample Irradiation time,s Neutron flux,10**10 /cm2/sec2339400100044 ATI-FeM 600 3.53+-0.18 2339400100045 ATI-Fe2 600 3.73+-0.20 2339400100046 ATI-FeA2 120 3.83+-0.29 2339400100047 ATI-FeA4 73 3.62+-0.19 2339400100048 (AMS) AMS facility based on 3MV tandem was used to 2339400100049 measure isotopes ratios Fe-55/Fe-56, Fe-55/Fe-54. 2339400100050 MONITOR (40-ZR-94(N,G)40-ZR-95,,SIG) 2339400100051 Thermal cross section 2339400100052 MONIT-REF (V1001377,S.Mughabghab,B,NEUT.RES,,,2006) 2339400100053 DECAY-MON (40-ZR-95,,DG,724.2,0.4427,DG,756.7,0.5438) 2339400100054 ASSUMED (ASSUM1,40-ZR-94(N,G)40-ZR-95,,RI) 280+-10 mb. 2339400100055 Used in correction for epithermal part contribution . 2339400100056 DETECTOR (HPGE) For Zr monitor activity measurement. 2339400100057 HISTORY (20180404C) M.M. 2339400100058 (20190831U) SD: Small update in REL-REF. 2339400100059 (20220218A) SD: Correction in Subent 002. 2339400100060 ENDBIB 58 0 2339400100061 COMMON 4 3 2339400100062 MONIT MONIT-ERR ASSUM1 ASSUM1-ERR 2339400100063 MB MB MB MB 2339400100064 49.4 1.7 280. 10. 2339400100065 ENDCOMMON 3 0 2339400100066 ENDSUBENT 65 0 2339400199999 SUBENT 23394002 20220218 23102339400200001 BIB 10 32 2339400200002 REACTION (26-FE-54(N,G)26-FE-55,,SIG) 2339400200003 DECAY-DATA (26-FE-55,2.744YR,B+) 2.744+-0.009 yr 2339400200004 ASSUMED (ASSUM2,26-FE-54(N,G)26-FE-55,,SIG) 2.25+-0.18 b 2339400200005 (ASSUM3,26-FE-54(N,G)26-FE-55,,RI) 1.2+-0.1 b . 2339400200006 Used to define contribution due to epithermal flux. 2339400200007 REL-REF (R,,S.Mughabghab,B,NEUT.RES,,,2006) 2339400200008 (R,,B.Pritychenko+,J,NDS,113,3120,2012) 2339400200009 Two refs. for assumed data. 2339400200010 FLAG (1.) ATI-FeM sample 2339400200011 (2.) ATI-Fe2 sample 2339400200012 (3.) ATI-FeA2 sample 2339400200013 (4.) ATI-FeA4 sample 2339400200014 (5.) Mean value. 2339400200015 MISC-COL (MISC1) Neutron fluence, 10**13 /cm2 2339400200016 (MISC2) Fe-55/Fe-54 ratio , 10**-10 at/at 2339400200017 CORRECTION For 26-Fe-54(n,gamma) reaction < 1.% . 2339400200018 For epithermal contribution of Zr monitor- 7% . 2339400200019 ERR-ANALYS (ERR-T) Total error 6.4%. 2339400200020 Neutron fluence 5.6% : 2339400200021 (ERR-1) Zr monitor CS - 3.4% 2339400200022 (ERR-2) Epithermal correction and geometry 3.% 2339400200023 (ERR-3,,0.2) Mass of Zr sample 2339400200024 (ERR-4) Detector efficiency 2.% 2339400200025 (ERR-5) Gamma intensity per decay 0.5% 2339400200026 (ERR-6,,0.1) Time factors 2339400200027 AMS measurement 2.5% : 2339400200028 (ERR-7) PTB standard 1.5%, 2339400200029 (ERR-8,,1.) Atom counting 2339400200030 (ERR-9) Fe-56 current 0.6% 2339400200031 (ERR-10) AMS reproducibility 1.5% 2339400200032 STATUS (TABLE) Table VIII of Phys.Rev. C,96,025808,2017 2339400200033 HISTORY (20220218A) SD: Data units: MB -> B. 2339400200034 ENDBIB 32 0 2339400200035 COMMON 12 6 2339400200036 EN-DUMMY ASSUM2 ASSUM2-ERR ASSUM3 ASSUM3-ERR ERR-1 2339400200037 ERR-2 ERR-4 ERR-5 ERR-7 ERR-9 ERR-10 2339400200038 EV B B B B PER-CENT 2339400200039 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 2339400200040 0.0253 2.25 0.18 1.2 0.1 3.4 2339400200041 3. 2. 0.5 1.5 0.6 1.5 2339400200042 ENDCOMMON 6 0 2339400200043 DATA 7 5 2339400200044 DATA ERR-T MISC1 MISC1-ERR MISC2 MISC2-ERR 2339400200045 FLAG 2339400200046 B B SEE TEXT SEE TEXT SEE TEXT SEE TEXT 2339400200047 NO-DIM 2339400200048 2.21 0.15 21.2 1.1 4.69 0.10 2339400200049 1. 2339400200050 2.28 0.15 22.4 1.2 5.10 0.13 2339400200051 2. 2339400200052 2.24 0.15 4.59 0.35 1.03 0.022 2339400200053 3. 2339400200054 2.30 0.15 2.65 0.14 0.61 0.02 2339400200055 4. 2339400200056 2.26 0.15 2339400200057 5. 2339400200058 ENDDATA 14 0 2339400200059 ENDSUBENT 58 0 2339400299999 ENDENTRY 2 0 2339499999999