ENTRY 31790 20190205 31883179000000001 SUBENT 31790001 20190205 31883179000100001 BIB 18 70 3179000100002 TITLE Precise measurement of the thermal and stellar 3179000100003 54Fe(n,g)55Fe cross sections via accelerator mass 3179000100004 spectrometry 3179000100005 REFERENCE (J,PR/C,96,025808,2017) 3179000100006 #doi:10.1103/PhysRevC.96.025808 3179000100007 AUTHOR (A.Wallner, K.Buczak, T.Belgya, M.Bichler, L.Coquard, 3179000100008 I.Dillmann, R.Golser, F.Kaeppeler, A.Karakas, 3179000100009 W.Kutschera, C.Lederer, A.Mengoni, M.Pignatari, 3179000100010 A.Priller, R.Reifarth, P.Steier, L.Szentmiklosi) 3179000100011 INSTITUTE (3AULCBR,2AUSVIE,3HUNKFI,2AUSATI,2GERKFK,3AULMOU, 3179000100012 2UK EDG,2ZZZCER,2GERFRK) 3179000100013 (2UK UK) University of Hull, United Kingdom 3179000100014 REL-REF (O,23394001,A.Wallner+,J,PR/C,96,025808,2017) 3179000100015 Data measured at ATI and KIT compiled separately 3179000100016 (O,23047001,A.Wallner+,J,PR/C,96,025808,2017) 3179000100017 Data for Karlsruhe 3.7MV Van de Graaff irradiation 3179000100018 FACILITY (REAC,3HUNKFI) Budapest Neutron Centre (BNC) 3179000100019 INC-SOURCE (REAC) 10 MW research reactor of the BNC 3179000100020 INC-SPECT An average neutron energy of 10 meV. The typical 3179000100021 neutron flux at the irradiation position was 3 and 3179000100022 4 x 10**7 /cm2/s (thermal equivalent) for the 3179000100023 neutron-induced prompt gamma-ray sepectrometer (NIPS) 3179000100024 and PGAA station, respectively. 3179000100025 Thermal equivalent neutron fluence: 3179000100026 BNC-FeM (1.042+/-0.025) x 10**13/cm2 3179000100027 BNC-Fe4 (0.396+/-0.009) x 10**13/cm2 3179000100028 The neutron spectrum is characterize by a pure 1/v 3179000100029 shape with energies below 50 MeV. 3179000100030 SAMPLE Approximately 20 mg of Au powder were homogeneously 3179000100031 mixed with the iron powder and the mixture was pressed 3179000100032 into pellets. The pellets were sandwiched by two Au 3179000100033 foils forming a stack Au-(Fe/Au)-Au. 3179000100034 The iron samples 6 mm in diameter were prepared. 3179000100035 (26-FE-54,NAT=0.05845) Natural iron (BNC-FeM) 3179000100036 44 mg metal powder of natural isotopic composition. 3179000100037 (26-FE-54,ENR=0.9985) Enriched Fe-54 (BNC-Fe4) 3179000100038 45.2 mg, 99.85% enrichment Fe-54, STB Isotope GmbH. 3179000100039 DETECTOR (HPGE) For the induced activities of the Au 3179000100040 monitor foils. 3179000100041 METHOD (ACTIV) Two irradiations are carried out. 3179000100042 Sample name, irradiation-time, neutron-flux 3179000100043 BNC-FeM 5499 min, (3.19+/-0.07) x 10**7/cm2/s 3179000100044 BNC-Fe4 1481 min, (4.46+/-0.10) x 10**7/cm2/s 3179000100045 (AMS) AMS in Vienna Environmental Research Accelerator 3179000100046 was used to measure isotopes ratios. 3179000100047 (MOMIX) Mixture of Fe and Au powders used. 3179000100048 MONITOR (79-AU-197(N,G)79-AU-198,,SIG) 3179000100049 Thermal cross setio: 98.66+/-0.14 barn. 3179000100050 DECAY-MON (79-AU-198,,DG,411.8,0.9562) 3179000100051 ANALYSIS The spectrum-averaged 54Fe(n,g) cross section can 3179000100052 be directly calculated from the total neutron fluence 3179000100053 and isotope ratio measured via AMS. 3179000100054 Sample name isotope ratio of Fe-55/Fe-54 3179000100055 BNC-FeM (0.246+/-0.008) x 10**(-10) at/at 3179000100056 BNC-Fe4 (0.091+/-0.002) x 10**(-10) at/at 3179000100057 ERR-ANALYS (ERR-T) Total uncertainty 3.2% 3179000100058 (MONIT-ERR) Au cross section 0.1% 3179000100059 (ERR-1,,0.1) Mass of Au samples <0.1% 3179000100060 (ERR-2) Gamma efficiency 2.0% 3179000100061 (ERR-3) Gamma intensity per decay 0.12% 3179000100062 (ERR-4,,0.1) time factors <0.1% 3179000100063 (ERR-5) PTB standard 1.5% 3179000100064 (ERR-6,,1.0) Atom counting <1% 3179000100065 (ERR-7) Fe-56 current 0.6% 3179000100066 (ERR-8) AMS reproducibility 1.5% 3179000100067 ADD-RES Weighted mean of ATI measurement (in EXFOR entry 23394)3179000100068 and BNC measurement (in this entry) of the thermal 3179000100069 corss section: 2.30 +/- 0.07 b. 3179000100070 STATUS (TABLE) Table VIII in J.PhysRevC.96.025808(2017) 3179000100071 HISTORY (20190205C) So. NDS 3179000100072 ENDBIB 70 0 3179000100073 COMMON 5 3 3179000100074 ERR-2 ERR-3 ERR-5 ERR-7 ERR-8 3179000100075 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 3179000100076 2. 0.12 1.5 0.6 1.5 3179000100077 ENDCOMMON 3 0 3179000100078 ENDSUBENT 77 0 3179000199999 SUBENT 31790002 20190205 31883179000200001 BIB 2 4 3179000200002 REACTION (26-FE-54(N,G)26-FE-55,,SIG,,SPA) 3179000200003 FLAG (1.) BNC-FeM sample 3179000200004 (2.) BNC-Fe4 sample 3179000200005 (3.) Mean value of 1. and 2. 3179000200006 ENDBIB 4 0 3179000200007 COMMON 3 3 3179000200008 EN-DUMMY MONIT MONIT-ERR 3179000200009 EV MB MB 3179000200010 0.0253 98.66 0.14 3179000200011 ENDCOMMON 3 0 3179000200012 DATA 3 3 3179000200013 DATA ERR-T FLAG 3179000200014 B B NO-DIM 3179000200015 2.36 0.07 1. 3179000200016 2.29 0.06 2. 3179000200017 2.31 0.07 3. 3179000200018 ENDDATA 5 0 3179000200019 ENDSUBENT 18 0 3179000299999 ENDENTRY 2 0 3179099999999