ENTRY 14832 20240809 1483200000001 SUBENT 14832001 20240809 20250110 1483200100001 BIB 10 40 1483200100002 TITLE Determining the 9Be(n,gamma)10Be integral cross 1483200100003 section at fission neutron energies 1483200100004 AUTHOR (J.J.Goodell,J.A.Church,C.C.Keith,N.K.Harward, 1483200100005 B.Pierson, S.Tumey,C.Dorais, B.B.Bandong) 1483200100006 REFERENCE (J,PR/C,109,014625,2024) 1483200100007 #doi:10.1103/PhysRevC.109.014625 1483200100008 INSTITUTE (1USALRL,1USALAS,1USABNW) 1483200100009 METHOD (AMS,CHSEP) Foil activation experiments were 1483200100010 performed using the Flattop critical assembly at the 1483200100011 National Criticality Experiments Research Center as 1483200100012 the neutron source, investigating activations by 1483200100013 neutron spectra created with both the HEU and Pu 1483200100014 cores. The 10Be/9Be ratio was measured through 1483200100015 accelerator mass spectrometry and the experiment was 1483200100016 simulated using MCNP to determine the total neutron 1483200100017 fluence. Activation products in irradiated foils were 1483200100018 measured through gamma spectrometry, except for the 1483200100019 Be foils which were assayed via AMS. Irradiated foils 1483200100020 were separated and dissolved individually, including 1483200100021 Al wraps when present, in Aqua Regia, nitric acid, or 1483200100022 hydrochloric acid, as required. 1483200100023 ANALYSIS The experiments were simulated using the Monte Carlo 1483200100024 N-Particle radiation transport code and combined with 1483200100025 experimental results to determine the total neutron 1483200100026 fluence, while the STAYSL-PNNL suite and FISPACT-II 1483200100027 code were used to validate the model and assess the 1483200100028 systematic uncertainty. 1483200100029 ERR-ANALYS (ERR-T) Combined statistical and systematic errors. 1483200100030 (ERR-S,2.,5.) AMS measurements, 198Au gamma counting, 1483200100031 MCNP tally output. 1483200100032 (ERR-1) Gamma detector calibration. 1483200100033 (ERR-2) AMS 10Be/9Be standard. 1483200100034 (ERR-3) Foil masses. 1483200100035 (ERR-4) Time keeping. 1483200100036 (ERR-5) 198Au nuclear data. 1483200100037 (ERR-6) Model implementation. 1483200100038 CORRECTION The measured values were corrected for Be and Al 1483200100039 material blanks as well as reagent blanks. 1483200100040 STATUS (APRVD) Approved by J.J.Goodell on August 22, 2024. 1483200100041 HISTORY (20240809C) BP 1483200100042 ENDBIB 40 0 1483200100043 COMMON 6 3 1483200100044 ERR-1 ERR-2 ERR-3 ERR-4 ERR-5 ERR-6 1483200100045 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 1483200100046 3.0 1.1 2.0 1.0 1.0 12.01483200100047 ENDCOMMON 3 0 1483200100048 ENDSUBENT 47 0 1483200199999 SUBENT 14832002 20240809 20250110 1483200200001 BIB 4 10 1483200200002 REACTION (4-BE-9(N,G)4-BE-10,,SIG,,FST) 1483200200003 FACILITY (CRASS,1USALAS) The Flattop critical assembly (FT-HEU) 1483200200004 at the National Criticality Experiments Research 1483200200005 Center (NCERC) of the Nevada National Security Site. 1483200200006 SAMPLE Foil masses 20.7, 20.0, 20.8, and 20.2 mg, located far 1483200200007 (1.26+-0.09 MeV), center (1.32+-0.09 MeV), boundary 1483200200008 (0.98+-0.08 MeV), and reflector (0.59+-0.05 MeV). 1483200200009 STATUS (TABLE,,J.J.Goodell+,J,PR/C,109,014625,2024) 1483200200010 Table VII, page 014625-10 of J,PR/C,109,014625,2024. 1483200200011 (COREL,14832003) Data from FT-Pu assembly. 1483200200012 ENDBIB 10 0 1483200200013 NOCOMMON 0 0 1483200200014 DATA 3 4 1483200200015 EN-DUMMY DATA ERR-T 1483200200016 MEV MICRO-B MICRO-B 1483200200017 0.59 26.5 2.2 1483200200018 0.98 24. 3. 1483200200019 1.26 21.7 1.3 1483200200020 1.32 21.8 1.4 1483200200021 ENDDATA 6 0 1483200200022 ENDSUBENT 21 0 1483200299999 SUBENT 14832003 20240809 20250110 1483200300001 BIB 4 9 1483200300002 REACTION (4-BE-9(N,G)4-BE-10,,SIG,,FST) 1483200300003 FACILITY (CRASS,1USALAS) The Flattop critical assembly (FT-Pu) 1483200300004 at the National Criticality Experiments Research 1483200300005 Center (NCERC) of the Nevada National Security Site. 1483200300006 SAMPLE Foil mass 20.0+-0.3 mg located at the center 1483200300007 (1.46+0.11 MeV). 1483200300008 STATUS (TABLE,,J.J.Goodell+,J,PR/C,109,014625,2024) 1483200300009 Table VII, page 014625-10 of J,PR/C,109,014625,2024. 1483200300010 (COREL,14832002) Data from FT-HEU assembly 1483200300011 ENDBIB 9 0 1483200300012 NOCOMMON 0 0 1483200300013 DATA 3 1 1483200300014 EN-DUMMY DATA ERR-T 1483200300015 MEV MICRO-B MICRO-B 1483200300016 1.46 18.6 1.1 1483200300017 ENDDATA 3 0 1483200300018 ENDSUBENT 17 0 1483200399999 ENDENTRY 3 0 1483299999999