ENTRY 14747 20250423 151814747000 1 SUBENT 14747001 20250423 151814747001 1 BIB 11 48 14747001 2 TITLE Nuclear spectrometry of 9.6 h 196Aum2 and the 14747001 3 reaction of 197Au with fast neutrons 14747001 4 AUTHOR (K.J.Moody,N.Gharibyan,D.A.Shaughnessy,P.M.Grant, 14747001 5 J.M.Gostic,C.J.Cerjan,C.B.Yeamans,J.D.Despotopulos, 14747001 6 S.A.Faye) 14747001 7 REFERENCE (J,JP/G,47,045116,2020) 14747001 8 #doi:10.1088/1361-6471/ab67e9 14747001 9 INSTITUTE (1USALRL) 14747001 10 FACILITY (LASER,1USALRL) The National Ignition Facility at 14747001 11 Lawrence Livermore National Laboratory. 14747001 12 DETECTOR (GE) gamma- and x-ray photons were measured with 14747001 13 single semiconductor germanium photon detectors. 14747001 14 SAMPLE The targets consisted of thin gold foils, nominally 14747001 15 2.5 cm in diameter, backed with thin aluminum foils 14747001 16 to act as flux monitors via the 27Al(n,a)24Na 14747001 17 reaction and to collect reaction products recoiling 14747001 18 from the gold. The foils were fielded in sealed 14747001 19 aluminum irradiation fixtures (Target Option 14747001 20 Activation Device (TOAD)), often as part of a stack 14747001 21 of foils comprising other activation experiments. The 14747001 22 TOADs are 2 mm thick and 5 cm diameter, and can 14747001 23 accommodate circular foils up to 2.5 cm diameter in a 14747001 24 stack that can be as thick as 0.6 mm. Targets of 14747001 25 different materials are isolated from one another by 14747001 26 thin aluminum foils; recoil losses of 15 h 24Na from 14747001 27 a backing foil are replaced by recoil from the 14747001 28 upstream foil stack or the TOAD cover plate, 14747001 29 validating the use of 27Al as a flux monitor. The 14747001 30 TOAD is sealed with an adhesive that, after curing, 14747001 31 can be reopened with mechanical force to release the 14747001 32 irradiated foils. 14747001 33 METHOD (ACTIV) The neutron activation of gold is the basis 14747001 34 of an implosion performance diagnostic at the 14747001 35 National Ignition Facility at Lawrence Livermore 14747001 36 National Laboratory. 14747001 37 ERR-ANALYS (ERR-T) All errors are reported at the one-sigma 14747001 38 limit. The statistical and systematic uncertainties 14747001 39 were propagated. 14747001 40 (ERR-SYS,1.,2.) The systematic uncertainty of 1%-2%, 14747001 41 from the uncertainties of the decay rates of the 14747001 42 radionuclides in the sources used in the calibration 14747001 43 of the detectors, does not apply to the reported 14747001 44 ratios of gamma-ray intensities. 14747001 45 CORRECTION Correction for self-attenuation by the relatively 14747001 46 thick gold foils, the extended-source geometric 14747001 47 correction, and for gamma-ray absolute branching 14747001 48 ratios. 14747001 49 HISTORY (20250423C) BP 14747001 50 ENDBIB 48 0 14747001 51 COMMON 1 3 14747001 52 EN 14747001 53 MEV 14747001 54 14.1 14747001 55 ENDCOMMON 3 0 14747001 56 ENDSUBENT 55 0 1474700199999 SUBENT 14747002 20250423 151814747002 1 BIB 4 9 14747002 2 REACTION (79-AU-197(N,2N)79-AU-196-G+M1,,SIG) 14747002 3 SAMPLE Sample ID: T65, Al monitor per 5.02 cm2: 32.6 mg. 14747002 4 DECAY-DATA (79-AU-196-G,6.167D,DG,333.0,0.263, 14747002 5 DG,355.7,1.0, 14747002 6 DG,1091.4,0.00171) 14747002 7 (79-AU-196-G,6.167D,DG,426.0,1.0) 14747002 8 STATUS (TABLE,,K.J.Moody,J,JP/G,47,045116,2020) - Table17 14747002 9 (COREL,14747003) Data from sample ID T64 14747002 10 (COREL,14747004) Data from sample ID T66 14747002 11 ENDBIB 9 0 14747002 12 NOCOMMON 0 0 14747002 13 DATA 2 1 14747002 14 DATA ERR-T 14747002 15 B B 14747002 16 1.959 0.027 14747002 17 ENDDATA 3 0 14747002 18 ENDSUBENT 17 0 1474700299999 SUBENT 14747003 20250423 151814747003 1 BIB 4 9 14747003 2 REACTION (79-AU-197(N,2N)79-AU-196-G+M1,,SIG) 14747003 3 DECAY-DATA (79-AU-196-G,6.167D,DG,333.0,0.263, 14747003 4 DG,355.7,1.0, 14747003 5 DG,1091.4,0.00171) 14747003 6 (79-AU-196-G,6.167D,DG,426.0,1.0) 14747003 7 SAMPLE Sample ID: T64, Al monitor per 5.02 cm2: 32.7 mg. 14747003 8 STATUS (TABLE,,K.J.Moody,J,JP/G,47,045116,2020) - Table17 14747003 9 (COREL,14747002) Data from sample ID T65 14747003 10 (COREL,14747004) Data from sample ID T66 14747003 11 ENDBIB 9 0 14747003 12 NOCOMMON 0 0 14747003 13 DATA 2 1 14747003 14 DATA ERR-T 14747003 15 B B 14747003 16 2.040 0.036 14747003 17 ENDDATA 3 0 14747003 18 ENDSUBENT 17 0 1474700399999 SUBENT 14747004 20250423 151814747004 1 BIB 4 9 14747004 2 REACTION (79-AU-197(N,2N)79-AU-196-G+M1,,SIG) 14747004 3 DECAY-DATA (79-AU-196-G,6.167D,DG,333.0,0.263, 14747004 4 DG,355.7,1.0, 14747004 5 DG,1091.4,0.00171) 14747004 6 (79-AU-196-G,6.167D,DG,426.0,1.0) 14747004 7 SAMPLE Sample ID: T66, Al monitor per 5.02 cm2: 32.5 mg. 14747004 8 STATUS (TABLE,,K.J.Moody,J,JP/G,47,045116,2020) - Table17 14747004 9 (COREL,14747002) Data from sample ID T65 14747004 10 (COREL,14747003) Data from sample ID T64 14747004 11 ENDBIB 9 0 14747004 12 NOCOMMON 0 0 14747004 13 DATA 2 1 14747004 14 DATA ERR-T 14747004 15 B B 14747004 16 1.958 0.032 14747004 17 ENDDATA 3 0 14747004 18 ENDSUBENT 17 0 1474700499999 SUBENT 14747005 20250423 151814747005 1 BIB 3 6 14747005 2 REACTION (79-AU-197(N,2N)79-AU-196-G+M1,,SIG,,AV) 14747005 3 ANALYSIS Weighted average. 14747005 4 STATUS (DEP,14747002) 14747005 5 (DEP,14747003) 14747005 6 (DEP,14747004) 14747005 7 (TABLE,,K.J.Moody,J,JP/G,47,045116,2020) - Table17 14747005 8 ENDBIB 6 0 14747005 9 NOCOMMON 0 0 14747005 10 DATA 2 1 14747005 11 DATA ERR-T 14747005 12 B B 14747005 13 1.979 0.026 14747005 14 ENDDATA 3 0 14747005 15 ENDSUBENT 14 0 1474700599999 SUBENT 14747006 20250423 151814747006 1 BIB 3 7 14747006 2 REACTION (79-AU-197(N,2N)79-AU-196-M2/G+M1,,SIG/RAT) 14747006 3 DECAY-DATA (79-AU-196-G,6.167D,DG,333.0,0.263, 14747006 4 DG,355.7,1.0, 14747006 5 DG,1091.4,0.00171) 14747006 6 (79-AU-196-G,6.167D,DG,426.0,1.0) 14747006 7 (79-AU-196-M2,576.2MIN,DG) Measured by authors. 14747006 8 STATUS (TABLE,,K.J.Moody,J,JP/G,47,045116,2020) - Table19 14747006 9 ENDBIB 7 0 14747006 10 NOCOMMON 0 0 14747006 11 DATA 2 1 14747006 12 DATA ERR-T 14747006 13 NO-DIM NO-DIM 14747006 14 0.0731 0.0019 14747006 15 ENDDATA 3 0 14747006 16 ENDSUBENT 15 0 1474700699999 SUBENT 14747007 20250423 151814747007 1 BIB 3 11 14747007 2 REACTION (79-AU-197(N,2N)79-AU-196,,SIG) 14747007 3 ANALYSIS The total cross section for the production of the sum 14747007 4 of all isomeric states (196Aut) is obtained by 14747007 5 multiplying by (1 + I), where I is the isomer ratio. 14747007 6 Propagating the uncertainty with those associated with 14747007 7 the two activation fractions and the isomer ratio a 14747007 8 reaction cross section for 197Au(n,2n)196Aut is 14747007 9 obtained. 14747007 10 STATUS (DEP,14747005) 14747007 11 (DEP,14747006) 14747007 12 (TABLE,,K.J.Moody,J,JP/G,47,045116,2020) - Table18 14747007 13 ENDBIB 11 0 14747007 14 NOCOMMON 0 0 14747007 15 DATA 2 1 14747007 16 DATA ERR-T 14747007 17 B B 14747007 18 2.124 0.055 14747007 19 ENDDATA 3 0 14747007 20 ENDSUBENT 19 0 1474700799999 ENDENTRY 7 0 1474799999999