ENTRY 31766 20180509 31843176600000001 SUBENT 31766001 20180509 31843176600100001 BIB 15 40 3176600100002 TITLE Measurement of 23Na(n,2n) cross section in 3176600100003 well-defined reactor spectra 3176600100004 AUTHOR (M.Kostal, M.Svadlenkova, P.Baron, J.Milcak, 3176600100005 M.Marecek, J.Uhlir) 3176600100006 INSTITUTE (3CZRUJV) 3176600100007 REFERENCE (J,ARI,111,1,2016) 3176600100008 (J,EPJ/CS,146,04045,2017) Revised values tabulated. 3176600100009 (W,KOSTAL,20180228) Latest values tabulated. 3176600100010 Document LR0-RESR-004 submitted to IRPhE in 2018 3176600100011 "VVER-1000 physics experiments hexagonal jattices 3176600100012 (1.275 cm Pitch) of Low Enriched U(3.3 wt.% U235)O2 3176600100013 fuel assemblies in light water 75As(n, 2n), 3176600100014 23Na(n,2n), 90Zr(n,2n), 89Y(n,2n) reaction rates" 3176600100015 received from M.Kostal on 28 February 2018. 3176600100016 REL-REF (N,,M.Kostal+,J,ARI,135,83,2018) 3176600100017 Measured LR-0 neutron spectrum in void case tabulated 3176600100018 FACILITY (REAC,3CZRUJV) LR-0 reactor 3176600100019 INC-SOURCE (REAC) 3176600100020 INC-SPECT The measured numerical spectrum in void case is in 3176600100021 Table 2 of M.Kostal+,Appl.Radiat.Isot.135(2018)83. 3176600100022 SAMPLE NaF powder (1.208 g/cm3, 644 g) in Al can. 3176600100023 Au (1% Au in Al) and Ni (3.6 mm diam., 0.1 mm thick). 3176600100024 METHOD (ACTIV) Irradiated for ~21 hours 3176600100025 (GSPEC) Measurement started 7 weeks after irradiation, 3176600100026 and continued for 4 weeks. 3176600100027 DETECTOR (HPGE) Efficiency calculated by MCNP6 3176600100028 CORRECTION Corrected for the spectral shift (ratio between the 3176600100029 full geometry and empty geometry) 3176600100030 Not corrected for 23Na(g,n)22Na because the most 3176600100031 energetic part of the photon spectra is below the 3176600100032 (g,n) threshold. 3176600100033 ERR-ANALYS The uncertainties due to the half-life, pin radial or 3176600100034 axial position, and reactor shut-down time were 3176600100035 considered as negligible. 3176600100036 STATUS (APRVD) Proof-read by Michal Kostal (2018-05-09) 3176600100037 HISTORY (20160309C) VS 3176600100038 (20161205A) VS. MONITOR:FIS deleted. Major rev. in 002.3176600100039 (20180302D) On. 003 deleted. 3176600100040 (20180302A) On. Major rev. in 001-002. 004-005 added. 3176600100041 (20180509U) On. CORRECTION: Typo corrected. 3176600100042 ENDBIB 40 0 3176600100043 NOCOMMON 0 0 3176600100044 ENDSUBENT 43 0 3176600199999 SUBENT 31766002 20180302 31823176600200001 BIB 8 20 3176600200002 REACTION (11-NA-23(N,2N)11-NA-22,,SIG,,SPA) 3176600200003 Averaged in LR-0 reactor spectrum 3176600200004 DECAY-DATA (11-NA-22,2.6027YR,DG,1274.5,0.99941) 3176600200005 MONITOR (79-AU-197(N,G)79-AU-198,,SIG) 3176600200006 (28-NI-58(N,P)27-CO-58,,SIG) 3176600200007 DECAY-MON (79-AU-198-G,2.6947D,DG,411.8,0.9562) 3176600200008 (27-CO-58-G,70.86D,DG,810.8,0.9945) 3176600200009 MISC-COL (MISC) Cross section averaged in LR-0 reactor spectrum 3176600200010 above 13 MeV 3176600200011 ERR-ANALYS (ERR-T) Total uncertainty (2.7%) propagated from 3176600200012 (ERR-S) Count rate (1.4%) 3176600200013 (ERR-1) Detector efficiency (HPGe efficiency, 3176600200014 Marinelli beaker position, NaF salt distribution in 3176600200015 the Marinelli beaker) (1%) 3176600200016 (ERR-2) Scaling (Au and Ni activity and standard 3176600200017 deviation between them (2%) 3176600200018 STATUS (TABLE) Table 2 of Appl.Radiat.Isot.111(2016)1 3176600200019 (SPSDD,31766004) 3176600200020 HISTORY (20161205A) VS. SF8: FIS -> SPA 3176600200021 (20180302A) On. Superseded. MISC added. 3176600200022 ENDBIB 20 0 3176600200023 COMMON 2 3 3176600200024 ERR-1 ERR-2 3176600200025 PER-CENT PER-CENT 3176600200026 1. 2. 3176600200027 ENDCOMMON 3 0 3176600200028 DATA 5 1 3176600200029 EN-DUMMY DATA ERR-T ERR-S MISC 3176600200030 MEV MICRO-B PER-CENT PER-CENT MB 3176600200031 1. 0.912 2.7 1.4 26.539 3176600200032 ENDDATA 3 0 3176600200033 ENDSUBENT 32 0 3176600299999 NOSUBENT 31766003 20180302 31823176600300001 SUBENT 31766004 20180302 31823176600400001 BIB 8 19 3176600400002 REACTION (11-NA-23(N,2N)11-NA-22,,SIG,,SPA) 3176600400003 Averaged in LR-0 reactor spectrum 3176600400004 DECAY-DATA (11-NA-22,2.6018YR,DG,1274.5,0.9994) 3176600400005 MONITOR (79-AU-197(N,G)79-AU-198,,SIG) 3176600400006 (28-NI-58(N,P)27-CO-58,,SIG) 3176600400007 DECAY-MON (79-AU-198-G,2.6941D,DG,411.8,0.9562) 3176600400008 (27-CO-58-G,70.86D,DG,810.7593,0.9945) 3176600400009 MISC-COL (MISC) Cross section averaged in LR-0 reactor spectrum 3176600400010 above 10 MeV 3176600400011 ERR-ANALYS (ERR-T) Total uncertainty (4.9%) 3176600400012 (ERR-1) Statistics of 22Na activity (2.3%) 3176600400013 (ERR-2) Target modeling (1.0%) 3176600400014 (ERR-3) HPGe efficiency volume source - Na (0.9%) 3176600400015 (ERR-4) Statistics of 198Au activity (0.7%) 3176600400016 (ERR-5) Statistics of 58Co activity (1.6%) 3176600400017 (ERR-6) HPGe efficiency point source - Au,Ni (1.9%) 3176600400018 (ERR-7) Bias Au and Ni based scaling factors (3.2%) 3176600400019 STATUS (TABLE) Table 3.7.5.5 of LR0-RESR-004 (2018) 3176600400020 HISTORY (20180302C) On 3176600400021 ENDBIB 19 0 3176600400022 COMMON 6 3 3176600400023 ERR-2 ERR-3 ERR-4 ERR-5 ERR-6 ERR-7 3176600400024 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 3176600400025 1.0 0.9 0.7 1.6 1.9 3.2 3176600400026 ENDCOMMON 3 0 3176600400027 DATA 5 1 3176600400028 EN-DUMMY DATA ERR-T ERR-1 MISC 3176600400029 MEV MICRO-B PER-CENT PER-CENT MB 3176600400030 1. 0.9604 4.9 2.3 2.876 3176600400031 ENDDATA 3 0 3176600400032 ENDSUBENT 31 0 3176600499999 SUBENT 31766005 20180305 31823176600500001 BIB 5 8 3176600500002 REACTION (11-NA-23(N,2N)11-NA-22,,SIG,,FIS) 3176600500003 ANALYSIS Cross section averaged over the LR-0 spectrum above 3176600500004 10 MeV multiplied by the fracion of 235U prompt 3176600500005 fission neutrons above 10 MeV in ENDF/B-VII (0.1396%) 3176600500006 ERR-ANALYS (DATA-ERR) Total uncertainty (4.9%) 3176600500007 STATUS (TABLE) Table 3.7.5.5 of LR0-RESR-004 (2018) 3176600500008 (DEP,31766004) LR-0 spectrum averaged cross section 3176600500009 HISTORY (20180302C) On 3176600500010 ENDBIB 8 0 3176600500011 NOCOMMON 0 0 3176600500012 DATA 3 1 3176600500013 KT-DUMMY DATA DATA-ERR 3176600500014 MEV MB PER-CENT 3176600500015 1.32 0.00384 4.9 3176600500016 ENDDATA 3 0 3176600500017 ENDSUBENT 16 0 3176600599999 ENDENTRY 5 0 3176699999999