ENTRY 21847 20230130 2184700000001 SUBENT 21847001 20230130 20231011 2184700100001 BIB 12 30 2184700100002 TITLE The Au(n,2n) and Au(n,gamma) cross sections at 14 MeV 2184700100003 AUTHOR (T.B.Ryves,P.Kolkowski) 2184700100004 INSTITUTE (2UK NPL) 2184700100005 REFERENCE (J,JP/G,7,115,1981) Main reference. 2184700100006 (P,NEANDC(E)-212,(8),87,1980) Preliminary data. 2184700100007 FACILITY (VDG,2UK NPL) Accelerator SAMES. 2184700100008 INC-SOURCE (D-T) 140 keV deuterons onto a Ti-t target. The 2184700100009 neutron flux density was continuously monitored 2184700100010 with a long counter. 2184700100011 SAMPLE Au foils (240 mg, 2.54 cm in diam.) were sandwiched 2184700100012 between two Fe foils (380 mg, 2.54 cm in diam.). 2184700100013 METHOD (ACTIV) 2184700100014 DETECTOR (GELI) A calibrated Ge(Li) detector, active volume 2184700100015 40 cm3. 2184700100016 MONITOR (26-FE-56(N,P)25-MN-56,,SIG) The activities of the 2184700100017 Fe foils were measured with the 4*pi beta-gamma 2184700100018 coincidence technique. Value taken from an 2184700100019 evaluation by ryves and axton, and a further 2184700100020 contribution of 0.1 mb was added to account for 2184700100021 other reactions which also produce Mn-56. 2184700100022 ERR-ANALYS The following variance-covariance matrix was given 2184700100023 for the measurements, 2184700100024 Au(n,2n)g+m 0.031**2 2184700100025 Au(n,2n)m/g 0.003**2 0.043**2 2184700100026 Au(n,g) 0.031**2 0 0.096**2 2184700100027 Fe56(n,p) 0.009**2 0 0.009**2 0.009**2 2184700100028 HISTORY (19830414C) 2184700100029 (19830727A) BN. In Se003 'decay-data' corrected 2184700100030 (20230130A) SD:Updated to new date formats,lower case. 2184700100031 Corrections in all Subents. 2184700100032 ENDBIB 30 0 2184700100033 COMMON 2 3 2184700100034 MONIT MONIT-ERR 2184700100035 MB MB 2184700100036 109.9 1.0 2184700100037 ENDCOMMON 3 0 2184700100038 ENDSUBENT 37 0 2184700199999 SUBENT 21847002 20230130 20231011 2184700200001 BIB 7 25 2184700200002 REACTION (79-AU-197(N,2N)79-AU-196,,SIG) 2184700200003 ANALYSIS The value of the isomeric cross section ratio, 2184700200004 reported in the same reference, was needed to 2184700200005 analyse the observed activity, assuming that it 2184700200006 was the same at 14.68 MeV and 14.3 MeV. 2184700200007 DECAY-DATA (79-AU-196-G,6.183D,DG,355.,0.877) 2184700200008 CORRECTION For- 2184700200009 - gamma-ray summing events in the Ge(Li) detector 2184700200010 (0.3%), 2184700200011 - gamma-ray absorption in the Au foils (0.6%). 2184700200012 No correction was applied for the activation effects 2184700200013 of secondary neutrons from the Au foil or target on 2184700200014 the Fe monitor. 2184700200015 ERR-ANALYS (ERR-T) Total uncertainty 2184700200016 (ERR-S) statistical uncertainty 2184700200017 (ERR-1) neutron energy resolution uncertainty 2184700200018 (ERR-2) isomeric ratio uncertainty 2184700200019 (ERR-3) monitor cross section uncertainty 2184700200020 (ERR-4) half-life uncertainty 2184700200021 (ERR-5) gamma-ray counting efficiency uncertainty 2184700200022 (ERR-6) gamma-ray intensity uncertainty 2184700200023 (ERR-7) beta counting efficiency uncertainty 2184700200024 STATUS (TABLE) Table 2 from J.Phys.,G7(1981)115 2184700200025 (DEP,21847003) See analysis 2184700200026 HISTORY (20230130U) SD: BIB updated. 2184700200027 ENDBIB 25 0 2184700200028 COMMON 2 3 2184700200029 EN EN-RSL 2184700200030 MEV MEV 2184700200031 14.68 0.03 2184700200032 ENDCOMMON 3 0 2184700200033 DATA 10 1 2184700200034 DATA ERR-T ERR-S ERR-1 ERR-2 ERR-3 2184700200035 ERR-4 ERR-5 ERR-6 ERR-7 2184700200036 MB MB PER-CENT PER-CENT PER-CENT PER-CENT 2184700200037 PER-CENT PER-CENT PER-CENT PER-CENT 2184700200038 2170. 67. 0.9 0.3 0.3 0.92184700200039 0.3 2.5 1. 0.5 2184700200040 ENDDATA 6 0 2184700200041 ENDSUBENT 40 0 2184700299999 SUBENT 21847003 20230130 20231011 2184700300001 BIB 7 20 2184700300002 REACTION (79-AU-197(N,2N)79-AU-196-M2/G+M1,,SIG/RAT) 2184700300003 ANALYSIS The ratio was found by analysing the shape of the 2184700300004 decay curve of the 355 keV gamma-ray activity 2184700300005 induced in the Au foils over a period of several 2184700300006 days. This method of analysis is not dependent on 2184700300007 the 9.7 hours isomers decay scheme or the Ge(Li) 2184700300008 detector efficiency. 2184700300009 DECAY-DATA (79-AU-196-G,6.183D,DG,355.) 2184700300010 (79-AU-196-M2,9.7HR,DG) 2184700300011 CORRECTION No correction for the very short-lived 8.2 second 2184700300012 metastable state in Au-196 was performed. 2184700300013 The effect of accidental summing events in the 2184700300014 Ge(Li) detector was assumed to be negligible. 2184700300015 ERR-ANALYS (ERR-T) Total uncertainty 2184700300016 (ERR-S) Statistical uncertainty 2184700300017 (ERR-1) Half-lives uncertainty (correlated). 2184700300018 STATUS (TABLE) Table 2 from J.Phys.,G7(1981)115 2184700300019 HISTORY (19830727A) decay-data corrected 2184700300020 (20230130A) SD: SF4: M/G -> M2/G+M1 in REACTION code. 2184700300021 BIB updated. 2184700300022 ENDBIB 20 0 2184700300023 COMMON 2 3 2184700300024 EN EN-RSL 2184700300025 MEV MEV 2184700300026 14.3 0.1 2184700300027 ENDCOMMON 3 0 2184700300028 DATA 4 1 2184700300029 DATA ERR-T ERR-S ERR-1 2184700300030 NO-DIM NO-DIM PER-CENT PER-CENT 2184700300031 0.068 0.003 4.3 0.1 2184700300032 ENDDATA 3 0 2184700300033 ENDSUBENT 32 0 2184700399999 SUBENT 21847004 20230130 20231011 2184700400001 BIB 8 30 2184700400002 REACTION (79-AU-197(N,G)79-AU-198,,SIG) 2184700400003 ANALYSIS The 355 keV gamma-ray from Au-196-g was used to 2184700400004 evaluate the neutron flux density in the foils. 2184700400005 DECAY-DATA (79-AU-198-G,2.696D,DG,411.,0.9547) 2184700400006 COMMENT Interfering small peaks in the gamma-ray spectrum 2184700400007 were considerably reduced by inserting a 680 mg/cm2 2184700400008 hafnium filter between the sample and the detector. 2184700400009 CORRECTION For- 2184700400010 - secondary neutrons from the aluminum backing 2184700400011 of the target (21.6%), 2184700400012 - scatter corrections, 2184700400013 Al foil wrapping, cellotape (1.5%) 2184700400014 Ti-t target (0.5%) 2184700400015 araldite seal (3.0%) 2184700400016 Au foil (1.1%) 2184700400017 room (0.5%) 2184700400018 - d-d neutron build up (2.0%). 2184700400019 - gamma-ray attenuation in the hafnium filter 2184700400020 411 keV gamma-rays (10.4%), 2184700400021 355 keV gamma-rays (13.2%). 2184700400022 ERR-ANALYS (ERR-T) Total uncertainty, 2184700400023 (ERR-S) statistical uncertainty, 2184700400024 (ERR-1) scatter correction uncertainties, 2184700400025 (ERR-2) d-d neutron build-up uncertainty, 2184700400026 (ERR-3) gamma-ray counting uncertainty (relative), 2184700400027 (ERR-4) Au-197(n,2n) reference cross section 2184700400028 uncertainty, 2184700400029 (ERR-5) half-life uncertainty. 2184700400030 STATUS (TABLE) Table 2 from J.Phys.,G7(1981)115 2184700400031 HISTORY (20230130U) SD: BIB updated. 2184700400032 ENDBIB 30 0 2184700400033 COMMON 2 3 2184700400034 EN EN-RSL 2184700400035 MEV MEV 2184700400036 14.3 0.1 2184700400037 ENDCOMMON 3 0 2184700400038 DATA 8 1 2184700400039 DATA ERR-T ERR-S ERR-1 ERR-2 ERR-3 2184700400040 ERR-4 ERR-5 2184700400041 MB MB PER-CENT PER-CENT PER-CENT PER-CENT 2184700400042 PER-CENT PER-CENT 2184700400043 1.09 0.1 8.5 2.3 1. 2.2184700400044 3.1 0.3 2184700400045 ENDDATA 6 0 2184700400046 ENDSUBENT 45 0 2184700499999 ENDENTRY 4 0 2184799999999