ENTRY 23252 20211122 23052325200000001 SUBENT 23252001 20211122 23052325200100001 BIB 12 35 2325200100002 TITLE A measurement of the 14C(n,gamma)15C cross section 2325200100003 at a stellar temperature of kT=23.3 keV 2325200100004 AUTHOR (H.Beer, M.Wiescher, F.Kaeppeler, J.Goerres, 2325200100005 P.E.Koehler) 2325200100006 INSTITUTE (2GERKFK) 2325200100007 REFERENCE (J,AJ,387,258,1992) 2325200100008 (R,INDC(GER)-0053,2021) Revised values of Karlsruhe 2325200100009 cross sections. 2325200100010 FACILITY (VDG,2GERKFK) 3.75 MV Van de Graaff 2325200100011 INC-SOURCE (P-LI7) 2325200100012 SAMPLE (6-C-14,ENR=0.89) Powder sample (605 +/- 15 mg, 2325200100013 2.97 cm x 1.20 cm x 0.5 cm) packed in a 0.0508 mm 2325200100014 thick electroformed Ni container with a porous CH2 2325200100015 plug glued into the open end. 2325200100016 Effective irradiated sample area was 2.97 cm x 1.20 cm 2325200100017 = 3.56 cm2. 2325200100018 MONITOR (79-AU-197(N,G)79-AU-198,,SIG,,MXW) 2325200100019 DETECTOR (HPGE) Relative efficiency 35%, energy resolution of 2325200100020 1.72 keV at 1.33 MeV. 2325200100021 27Al(p,g) resonance at 992 keV was used to determine 2325200100022 the gamma-ray efficiency from 1.84 to 11 MeV. 2325200100023 Pu238-C13 source with a line at 6.13 MeV was also used 2325200100024 for the efficiency determination. 2325200100025 METHOD (ACTIV) A fast sample changer was used. 2325200100026 Both irradiation time and counting time are 10 sec. 2325200100027 ERR-ANALYS (ERR-T) Quadratic error propagation from 2325200100028 (ERR-S) 14C(n,gamma)15C statistics (23%) 2325200100029 (ERR-1) Ge-detector efficiency for 15C (8%) 2325200100030 (ERR-3) 14C sample weight (2.5%) 2325200100031 (ERR-4) 15C gamma line intensity (2.9%) 2325200100032 (ERR-7,,1.) Neutron multiple scattering (<1%) 2325200100033 (MONIT-ERR) 197Au(n,gamma) standard cross section 2325200100034 HISTORY (20140812C) On 2325200100035 (20211122A) SD: Corrections in all Subents. 2325200100036 Subent 003 added. 2325200100037 ENDBIB 35 0 2325200100038 COMMON 3 3 2325200100039 ERR-1 ERR-3 ERR-4 2325200100040 PER-CENT PER-CENT PER-CENT 2325200100041 8. 2.5 2.9 2325200100042 ENDCOMMON 3 0 2325200100043 ENDSUBENT 42 0 2325200199999 SUBENT 23252002 20211122 23052325200200001 BIB 7 10 2325200200002 REACTION (6-C-14(N,G)6-C-15,,SIG,,MXW) 2325200200003 DECAY-DATA (6-C-15,2.449SEC,DG,5297.79,0.68) 2325200200004 MONIT-REF (22099001,W.Ratynski+,J,PR/C,37,595,1988) 2325200200005 DECAY-MON (79-AU-198-G,2.694D,DG,411.8,0.9552) 2325200200006 ERR-ANALYS (ERR-2) Ge-detector efficiency for 198Au (1.5%) 2325200200007 (ERR-5) 198Au gamma line intensity (0.105%) 2325200200008 (ERR-6) Misalignment of Au foils relative to 14C (2%) 2325200200009 STATUS (TABLE) Table 3 of Astrophys.J.387(1992)258 2325200200010 (SPSDD,23252003) Renormalized. 2325200200011 HISTORY (20211122A) SD: BIB updated. Subent superseded. 2325200200012 ENDBIB 10 0 2325200200013 COMMON 3 3 2325200200014 ERR-2 ERR-5 ERR-6 2325200200015 PER-CENT PER-CENT PER-CENT 2325200200016 1.5 0.105 2. 2325200200017 ENDCOMMON 3 0 2325200200018 DATA 6 1 2325200200019 KT DATA ERR-T ERR-S MONIT MONIT-ERR 2325200200020 KEV MICRO-B PER-CENT PER-CENT MB PER-CENT 2325200200021 23.3 1.72 25. 23. 648. 1.5 2325200200022 ENDDATA 3 0 2325200200023 ENDSUBENT 22 0 2325200299999 SUBENT 23252003 20211122 23052325200300001 BIB 8 15 2325200300002 REACTION 1((6-C-14(N,G)6-C-15,,SIG,,MXW)/ 2325200300003 (79-AU-197(N,G)79-AU-198,,SIG,,MXW)) 2325200300004 2(6-C-14(N,G)6-C-15,,SIG,,MXW) 2325200300005 DECAY-DATA (6-C-15,2.449SEC,DG,5297.79,0.632) 2325200300006 DECAY-MON (79-AU-198-G,3881.0MIN,DG,411.80,0.9558) 2325200300007 MONIT-REF (,R.Reifarth+,J,EPJ/P,133,424,2018) 2325200300008 ANALYSIS Cross section value in Subent 23252.002 is 2325200300009 renormalized 2325200300010 a)for new gold cross section 2325200300011 b) by an additional factor 0.68/0.632=1.076, which 2325200300012 accounts for the gamma-intensity of the 5297.29 keV 2325200300013 transition in the 15C decay (NDS/ENSDF 2020) 2325200300014 CORRECTION Correction for revised gold standard: 681/648 =1.051 2325200300015 STATUS (TABLE) Table on p.352 of INDC(GER)-0053 2325200300016 HISTORY (20211122C) SD 2325200300017 ENDBIB 15 0 2325200300018 NOCOMMON 0 0 2325200300019 DATA 8 1 2325200300020 KT DATA 1ERR-T 1DATA 2ERR-T 2ERR-S 2325200300021 MONIT MONIT-ERR 2325200300022 KEV NO-DIM NO-DIM MICRO-B PER-CENT PER-CENT 2325200300023 MB PER-CENT 2325200300024 23.3 2.65E-06 0.66E-06 1.97 25. 23. 2325200300025 681. 1.0 2325200300026 ENDDATA 6 0 2325200300027 ENDSUBENT 26 0 2325200399999 ENDENTRY 3 0 2325299999999