ENTRY 23282 20170827 22652328200000001 SUBENT 23282001 20170827 22652328200100001 BIB 13 28 2328200100002 TITLE Measurement of the 197Au(n,gamma) stellar cross section2328200100003 at kT=30keV by activation. 2328200100004 AUTHOR (P.Jimenez-Bonilla,J.Praena) 2328200100005 INSTITUTE (2SPNSEU) 2328200100006 REFERENCE (C,2014DEBREC,,(102),2014) 2328200100007 XIII Nuclei in the Cosmos, Debrecen,Hungary, 2328200100008 7-11 July 2014 . 2328200100009 FACILITY (ACCEL,2SPNSEU) 3 MV Tandem Pelletron at Centro 2328200100010 Nacional de Aceleradores, Seville . 2328200100011 Proton energy 1912 keV. Energy spread of proton beam 2328200100012 was < 1 keV. 2328200100013 INC-SOURCE (P-LI7) Metallic Li target on copper backing of 0.5 mm 2328200100014 thickness. Li layer of 380 microm thickness. 2328200100015 SAMPLE Au sample of 2.5 cm diameter, 0.1 mm ( 5.67E-4 at/b) 2328200100016 thickness, 0.3820g mass, 206.12 mm2 surface . 2328200100017 Placed on the back surface of the Li backing. 2328200100018 DETECTOR (HPGE) HPGe Ortec GMX gamma detector, placed at 28 mm 2328200100019 distance from backing to measure induced activities in 2328200100020 beryllium and gold. Efficiency was defined : 2328200100021 - experimentally by calibrated point sources; 2328200100022 - by MNCP simulation. 2328200100023 DECAY-DATA (79-AU-198-G,2.6947D,DG,411.8,0.9554) 2328200100024 MONITOR (3-LI-7(P,N)4-BE-7,,SIG) 2328200100025 DECAY-MON (4-BE-7,53.29D,DG,477.6,0.1044) 2328200100026 METHOD (ACTIV) Neutron irradiation time 4hr 45min. 2328200100027 Activities measurement 6hr 30min .Cooling time 15 min. 2328200100028 HISTORY (20151215C) M.M. 2328200100029 (20170827U) SD: Syntax of the ref. was corrected. 2328200100030 ENDBIB 28 0 2328200100031 NOCOMMON 0 0 2328200100032 ENDSUBENT 31 0 2328200199999 SUBENT 23282002 20151215 22482328200200001 BIB 6 40 2328200200002 REACTION (79-AU-197(N,G)79-AU-198,,SIG,,MXW) MACS 2328200200003 CORRECTION For gamma absorption and scattering in materials : 2328200200004 for Au - 0.9801 for Be - 0.9286. 2328200200005 For neutron scattering ( mainly in Cu backing) - 0.977.2328200200006 For the flat sample - 1.263 . 2328200200007 For decay during irradiation, cooling, measurement 2328200200008 for Au - 0.06718, for Be - 0.00353. 2328200200009 For difference of exp. quasi-Maxwellian spectrum from 2328200200010 true Maxwellian neutron spectrum of kT=25 keV - 0.955 2328200200011 ANALYSIS MACS at kT=25 keV was defined 2328200200012 = 2/sqrt(PI) * Kmax * SIGexp, where 2328200200013 SIGexp - exp. cross section, 2328200200014 Kmax - coefficient 0.955 for kT=25 keV, calculated by 2328200200015 using exp.measurements from REL-REFs of C.Lederer+ and 2328200200016 G.Feinberg and gold cross section from ENDF/B-VII.1, 2328200200017 see formula 7 in C,20014DEBREC,(102),2014 . 2328200200018 REL-REF (R,23152001,C.Lederer+,J,PR/C,83,034608,2011) 2328200200019 (R,O2230001,C.Lederer+,J,PR/C,85,055809,2012) 2328200200020 (R,O1983001,G.Feinberg+,J,PR/C,85,055810,2012) 2328200200021 Neutron spectrum. 2328200200022 (A,23284001,G.Feinberg+,J,PR/C,85,055810,2012) 2328200200023 MACS=616+-17 mb. 2328200200024 ERR-ANALYS (ERR-T) Total uncertainty ~ 4% . 2328200200025 Considered uncertainties: 2328200200026 (ERR-S) Counting statistics for Au - 0.7% 2328200200027 (ERR-1) Counting statistics for Be - 0.3% 2328200200028 (ERR-2) Correction factor for decay of Au - 0.01% 2328200200029 (ERR-3) Correction factor for decay of Be - 0.01% 2328200200030 (ERR-4) Correction for gamma absorption and scattering 2328200200031 for Au - 0.3% 2328200200032 (ERR-5) Correction for gamma absorption and scattering 2328200200033 for Be - 0.3% 2328200200034 (ERR-6) Ratio of gamma detection intensities Be to Au 2328200200035 - 1.8% 2328200200036 (ERR-7) Correction for the flat sample - 2% 2328200200037 (ERR-8) Correction for neutron scattering - 0.3% 2328200200038 (ERR-9) Correction for true Maxwellian spectrum - 1.5% 2328200200039 (ERR-10) Au sample thickness - 1.5% . 2328200200040 STATUS (TABLE) Text, pages 1, 5 ; uncertainties - Table 1 of 2328200200041 C,20014DEBREC,(102),2014 . 2328200200042 ENDBIB 40 0 2328200200043 COMMON 10 6 2328200200044 ERR-1 ERR-2 ERR-3 ERR-4 ERR-5 ERR-6 2328200200045 ERR-7 ERR-8 ERR-9 ERR-10 2328200200046 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 2328200200047 PER-CENT PER-CENT PER-CENT PER-CENT 2328200200048 0.3 0.01 0.01 0.3 0.3 1.8 2328200200049 2. 0.3 1.5 1.5 2328200200050 ENDCOMMON 6 0 2328200200051 DATA 4 1 2328200200052 KT DATA ERR-T ERR-S 2328200200053 KEV MB MB PER-CENT 2328200200054 25. 645. 25. 0.7 2328200200055 ENDDATA 3 0 2328200200056 ENDSUBENT 55 0 2328200299999 SUBENT 23282003 20151215 22482328200300001 BIB 4 7 2328200300002 REACTION (79-AU-197(N,G)79-AU-198,,SIG,,MXW,DERIV) MACS 2328200300003 ANALYSIS MACS at kT=30 keV was derived by extrapolation of MACS 2328200300004 at 25 keV as MACS(30keV) = 0.901 * MACS(25keV) 2328200300005 ERR-ANALYS (DATA-ERR) Total uncertainty ~ 4% . 2328200300006 STATUS (TABLE) Text, pages 1, 5 ; uncertainties - Table 1 of 2328200300007 C,20014DEBREC,(102),2014 . 2328200300008 (DEP,23282002) MACS at kT=25 keV in Subent 002. 2328200300009 ENDBIB 7 0 2328200300010 NOCOMMON 0 0 2328200300011 DATA 3 1 2328200300012 KT DATA DATA-ERR 2328200300013 KEV MB MB 2328200300014 30. 626. 25. 2328200300015 ENDDATA 3 0 2328200300016 ENDSUBENT 15 0 2328200399999 ENDENTRY 3 0 2328299999999