ENTRY 21847 20230130 231321847 0 1 SUBENT 21847001 20230130 231321847 1 1 BIB 12 30 21847 1 2 TITLE The Au(n,2n) and Au(n,gamma) cross sections at 14 MeV 21847 1 3 AUTHOR (T.B.Ryves,P.Kolkowski) 21847 1 4 INSTITUTE (2UK NPL) 21847 1 5 REFERENCE (J,JP/G,7,115,1981) Main reference. 21847 1 6 (P,NEANDC(E)-212,(8),87,1980) Preliminary data. 21847 1 7 FACILITY (VDG,2UK NPL) Accelerator SAMES. 21847 1 8 INC-SOURCE (D-T) 140 keV deuterons onto a Ti-t target. The 21847 1 9 neutron flux density was continuously monitored 21847 1 10 with a long counter. 21847 1 11 SAMPLE Au foils (240 mg, 2.54 cm in diam.) were sandwiched 21847 1 12 between two Fe foils (380 mg, 2.54 cm in diam.). 21847 1 13 METHOD (ACTIV) 21847 1 14 DETECTOR (GELI) A calibrated Ge(Li) detector, active volume 21847 1 15 40 cm3. 21847 1 16 MONITOR (26-FE-56(N,P)25-MN-56,,SIG) The activities of the 21847 1 17 Fe foils were measured with the 4*pi beta-gamma 21847 1 18 coincidence technique. Value taken from an 21847 1 19 evaluation by ryves and axton, and a further 21847 1 20 contribution of 0.1 mb was added to account for 21847 1 21 other reactions which also produce Mn-56. 21847 1 22 ERR-ANALYS The following variance-covariance matrix was given 21847 1 23 for the measurements, 21847 1 24 Au(n,2n)g+m 0.031**2 21847 1 25 Au(n,2n)m/g 0.003**2 0.043**2 21847 1 26 Au(n,g) 0.031**2 0 0.096**2 21847 1 27 Fe56(n,p) 0.009**2 0 0.009**2 0.009**2 21847 1 28 HISTORY (19830414C) 21847 1 29 (19830727A) BN. In Se003 'decay-data' corrected 21847 1 30 (20230130A) SD:Updated to new date formats,lower case. 21847 1 31 Corrections in all Subents. 21847 1 32 ENDBIB 30 0 21847 1 33 COMMON 2 3 21847 1 34 MONIT MONIT-ERR 21847 1 35 MB MB 21847 1 36 109.9 1.0 21847 1 37 ENDCOMMON 3 0 21847 1 38 ENDSUBENT 37 0 21847 199999 SUBENT 21847002 20230130 231321847 2 1 BIB 7 25 21847 2 2 REACTION (79-AU-197(N,2N)79-AU-196,,SIG) 21847 2 3 ANALYSIS The value of the isomeric cross section ratio, 21847 2 4 reported in the same reference, was needed to 21847 2 5 analyse the observed activity, assuming that it 21847 2 6 was the same at 14.68 MeV and 14.3 MeV. 21847 2 7 DECAY-DATA (79-AU-196-G,6.183D,DG,355.,0.877) 21847 2 8 CORRECTION For- 21847 2 9 - gamma-ray summing events in the Ge(Li) detector 21847 2 10 (0.3%), 21847 2 11 - gamma-ray absorption in the Au foils (0.6%). 21847 2 12 No correction was applied for the activation effects 21847 2 13 of secondary neutrons from the Au foil or target on 21847 2 14 the Fe monitor. 21847 2 15 ERR-ANALYS (ERR-T) Total uncertainty 21847 2 16 (ERR-S) statistical uncertainty 21847 2 17 (ERR-1) neutron energy resolution uncertainty 21847 2 18 (ERR-2) isomeric ratio uncertainty 21847 2 19 (ERR-3) monitor cross section uncertainty 21847 2 20 (ERR-4) half-life uncertainty 21847 2 21 (ERR-5) gamma-ray counting efficiency uncertainty 21847 2 22 (ERR-6) gamma-ray intensity uncertainty 21847 2 23 (ERR-7) beta counting efficiency uncertainty 21847 2 24 STATUS (TABLE) Table 2 from J.Phys.,G7(1981)115 21847 2 25 (DEP,21847003) See analysis 21847 2 26 HISTORY (20230130U) SD: BIB updated. 21847 2 27 ENDBIB 25 0 21847 2 28 COMMON 2 3 21847 2 29 EN EN-RSL 21847 2 30 MEV MEV 21847 2 31 14.68 0.03 21847 2 32 ENDCOMMON 3 0 21847 2 33 DATA 10 1 21847 2 34 DATA ERR-T ERR-S ERR-1 ERR-2 ERR-3 21847 2 35 ERR-4 ERR-5 ERR-6 ERR-7 21847 2 36 MB MB PER-CENT PER-CENT PER-CENT PER-CENT 21847 2 37 PER-CENT PER-CENT PER-CENT PER-CENT 21847 2 38 2170. 67. 0.9 0.3 0.3 0.921847 2 39 0.3 2.5 1. 0.5 21847 2 40 ENDDATA 6 0 21847 2 41 ENDSUBENT 40 0 21847 299999 SUBENT 21847003 20230130 231321847 3 1 BIB 7 20 21847 3 2 REACTION (79-AU-197(N,2N)79-AU-196-M2/G+M1,,SIG/RAT) 21847 3 3 ANALYSIS The ratio was found by analysing the shape of the 21847 3 4 decay curve of the 355 keV gamma-ray activity 21847 3 5 induced in the Au foils over a period of several 21847 3 6 days. This method of analysis is not dependent on 21847 3 7 the 9.7 hours isomers decay scheme or the Ge(Li) 21847 3 8 detector efficiency. 21847 3 9 DECAY-DATA (79-AU-196-G,6.183D,DG,355.) 21847 3 10 (79-AU-196-M2,9.7HR,DG) 21847 3 11 CORRECTION No correction for the very short-lived 8.2 second 21847 3 12 metastable state in Au-196 was performed. 21847 3 13 The effect of accidental summing events in the 21847 3 14 Ge(Li) detector was assumed to be negligible. 21847 3 15 ERR-ANALYS (ERR-T) Total uncertainty 21847 3 16 (ERR-S) Statistical uncertainty 21847 3 17 (ERR-1) Half-lives uncertainty (correlated). 21847 3 18 STATUS (TABLE) Table 2 from J.Phys.,G7(1981)115 21847 3 19 HISTORY (19830727A) decay-data corrected 21847 3 20 (20230130A) SD: SF4: M/G -> M2/G+M1 in REACTION code. 21847 3 21 BIB updated. 21847 3 22 ENDBIB 20 0 21847 3 23 COMMON 2 3 21847 3 24 EN EN-RSL 21847 3 25 MEV MEV 21847 3 26 14.3 0.1 21847 3 27 ENDCOMMON 3 0 21847 3 28 DATA 4 1 21847 3 29 DATA ERR-T ERR-S ERR-1 21847 3 30 NO-DIM NO-DIM PER-CENT PER-CENT 21847 3 31 0.068 0.003 4.3 0.1 21847 3 32 ENDDATA 3 0 21847 3 33 ENDSUBENT 32 0 21847 399999 SUBENT 21847004 20230130 231321847 4 1 BIB 8 30 21847 4 2 REACTION (79-AU-197(N,G)79-AU-198,,SIG) 21847 4 3 ANALYSIS The 355 keV gamma-ray from Au-196-g was used to 21847 4 4 evaluate the neutron flux density in the foils. 21847 4 5 DECAY-DATA (79-AU-198-G,2.696D,DG,411.,0.9547) 21847 4 6 COMMENT Interfering small peaks in the gamma-ray spectrum 21847 4 7 were considerably reduced by inserting a 680 mg/cm2 21847 4 8 hafnium filter between the sample and the detector. 21847 4 9 CORRECTION For- 21847 4 10 - secondary neutrons from the aluminum backing 21847 4 11 of the target (21.6%), 21847 4 12 - scatter corrections, 21847 4 13 Al foil wrapping, cellotape (1.5%) 21847 4 14 Ti-t target (0.5%) 21847 4 15 araldite seal (3.0%) 21847 4 16 Au foil (1.1%) 21847 4 17 room (0.5%) 21847 4 18 - d-d neutron build up (2.0%). 21847 4 19 - gamma-ray attenuation in the hafnium filter 21847 4 20 411 keV gamma-rays (10.4%), 21847 4 21 355 keV gamma-rays (13.2%). 21847 4 22 ERR-ANALYS (ERR-T) Total uncertainty, 21847 4 23 (ERR-S) statistical uncertainty, 21847 4 24 (ERR-1) scatter correction uncertainties, 21847 4 25 (ERR-2) d-d neutron build-up uncertainty, 21847 4 26 (ERR-3) gamma-ray counting uncertainty (relative), 21847 4 27 (ERR-4) Au-197(n,2n) reference cross section 21847 4 28 uncertainty, 21847 4 29 (ERR-5) half-life uncertainty. 21847 4 30 STATUS (TABLE) Table 2 from J.Phys.,G7(1981)115 21847 4 31 HISTORY (20230130U) SD: BIB updated. 21847 4 32 ENDBIB 30 0 21847 4 33 COMMON 2 3 21847 4 34 EN EN-RSL 21847 4 35 MEV MEV 21847 4 36 14.3 0.1 21847 4 37 ENDCOMMON 3 0 21847 4 38 DATA 8 1 21847 4 39 DATA ERR-T ERR-S ERR-1 ERR-2 ERR-3 21847 4 40 ERR-4 ERR-5 21847 4 41 MB MB PER-CENT PER-CENT PER-CENT PER-CENT 21847 4 42 PER-CENT PER-CENT 21847 4 43 1.09 0.1 8.5 2.3 1. 2.21847 4 44 3.1 0.3 21847 4 45 ENDDATA 6 0 21847 4 46 ENDSUBENT 45 0 21847 499999 ENDENTRY 4 0 2184799999999