ENTRY 41755 20230118 421341755 0 1 SUBENT 41755001 20230118 421341755 1 1 BIB 18 69 41755 1 2 TITLE Study of 239Pu(n,f) prompt fission neutron spectrum 41755 1 3 AUTHOR (M.Schulc, M.Petrova, T.Czakoj, M.Kostal, E.Lychagin, 41755 1 4 J.Simon) 41755 1 5 REFERENCE (J,RPC,206,110804,2023) 41755 1 6 #doi:10.1016/j.radphyschem.2023.110804 41755 1 7 INSTITUTE (4ZZZDUB) M.Petrova,E.Lychagin 41755 1 8 (3CZRUJV) M.Schulc,T.Czakoj, M.Kostal,J.Simon 41755 1 9 FACILITY (REAC,4ZZZDUB) IBR-2 pulsed fast reactor, 239PuO(2) as 41755 1 10 fuel. 41755 1 11 INC-SOURCE (REAC) Beam line no.3 41755 1 12 INC-SPECT Pu-239 fission neutron spectrum, 41755 1 13 flux at the moderator surface up to 1.E+16 n/cm2/sec. 41755 1 14 Samples were irradiated by thermalized prompt fission 41755 1 15 neutron spectrum of Pu, the mean energy of spectrum 41755 1 16 0.27 MeV ( from calculation ). 41755 1 17 DETECTOR (HPGE) Gamma-spectra of activated samples we41755 1 18 during March 2022 in different positions (5 cm, 10 cm, 41755 1 19 15 cm, or 25 cm) by HPGe detector (Canberra GC10021). 41755 1 20 METHOD (ACTIV) Irradiation time 12 days (12-24 April,2021) 41755 1 21 at 1.5 MW power. 41755 1 22 Reaction Cooling Measurement Net peak area 41755 1 23 time,sec time,sec 41755 1 24 46Ti(n,p) 2691138 790.4 121194 41755 1 25 54Fe(n,p) 26914113 202.9 165896 41755 1 26 58Ni(n,p) 26913229 672 146031 41755 1 27 58Ni(n,X) 26913229 672 2210 41755 1 28 89Y(n,2n) 28896824 83396 145604 41755 1 29 209Bi(n,3n) 28727028 76022 2167 41755 1 30 MONITOR (28-NI-58(N,P)27-CO-58,,SIG,,FIS) 41755 1 31 From the GMA PFNS evaluation and IRDFF-II 41755 1 32 cross-section 41755 1 33 DECAY-MON (27-CO-58-G,70.86D,DG,810.759,0.9945) 41755 1 34 ANALYSIS Averaged cross sections were derived from reaction 41755 1 35 rates measured, for reaction rates see formula (1) in 41755 1 36 PR/C,206,110804,2023. Difference of real spectra at 41755 1 37 the sample position and Pu-239 fission neutron spectrum41755 1 38 was taken into account. 41755 1 39 CORRECTION For the neutron spectrum filtered by water, calculated41755 1 40 by MCNP6. 41755 1 41 For difference of spectra for monitor reaction and 41755 1 42 reaction under study. 41755 1 43 The burnup of the reactor was not taken into the 41755 1 44 account. 41755 1 45 COMMENT Of author Martin Schulc. 41755 1 46 -The correction for neutron spectrum filtered by water41755 1 47 was calculated by MCNP6. 41755 1 48 This approach for PFNS reconstruction is validated in 41755 1 49 an article: KOSTAL, Michal, et al. Impact of reactor 41755 1 50 neutron spectrum on measured spectrum averaged cross 41755 1 51 sections. Annals of Nuclear Energy, 2022, 179: 109418. 41755 1 52 Since the correction factor is validated, we can relate41755 1 53 the result to 239Pu PFNS. 41755 1 54 -Response function is the cross section in group 41755 1 55 structure multiplied by the neutron flux in group 41755 1 56 structure (sum of groups then returns reaction rates). 41755 1 57 E50% is the energy where the multiplication gives 50% 41755 1 58 of reaction rate. 41755 1 59 REL-REF (M,,M.Kostal+,J,ANE,179,109418,2022) 41755 1 60 Approach for PFNS reconstruction. 41755 1 61 MISC-COL (MISC) The neutron energy which corresponds to a value 41755 1 62 of 50% of the integrated energy response function 41755 1 63 in the neutron field. 41755 1 64 ERR-ANALYS (ERR-T) Total uncertainty 41755 1 65 (ERR-1) Detector efficiency uncertainty 41755 1 66 (ERR-2) Monitor reaction C-S uncertainty 41755 1 67 (ERR-3) Calculated neutron flux uncertainty 41755 1 68 (ERR-S) Counts statistical uncertainty 41755 1 69 STATUS (APRVD) Approved by the author Martin Schulc 24-08-202341755 1 70 HISTORY (20230118C) M.M. 41755 1 71 ENDBIB 69 0 41755 1 72 COMMON 2 3 41755 1 73 EN-DUMMY MONIT 41755 1 74 MEV MB 41755 1 75 1.5 112.57 41755 1 76 ENDCOMMON 3 0 41755 1 77 ENDSUBENT 76 0 41755 199999 SUBENT 41755002 20230118 421341755 2 1 BIB 4 9 41755 2 2 REACTION (83-BI-209(N,3N)83-BI-207,,SIG,,FIS) 41755 2 3 SAMPLE Placed at 300 mm distance from the light water 41755 2 4 moderator (5 cm thickness) surface. 41755 2 5 Bismuth, 99.99% purity, 1.683 g 15 x 15 x 1 mm 41755 2 6 DECAY-DATA (83-BI-207,31.55YR,DG,569.702,0.9775, 41755 2 7 DG,1063.656,0.7450) 41755 2 8 STATUS (TABLE,,M.Schulc+,J,RPC,206,110804,2023) 41755 2 9 Table 5 - data, Table 4 - uncertainties. 41755 2 10 (SUPPL,41755007) Spectrum at sample position 41755 2 11 ENDBIB 9 0 41755 2 12 COMMON 4 3 41755 2 13 ERR-1 ERR-S ERR-2 ERR-3 41755 2 14 PER-CENT PER-CENT PER-CENT PER-CENT 41755 2 15 3.12 2.85 1.52 5.12 41755 2 16 ENDCOMMON 3 0 41755 2 17 DATA 3 1 41755 2 18 MISC DATA ERR-T 41755 2 19 MEV MB PER-CENT 41755 2 20 18.16 1.43E-02 6.8 41755 2 21 ENDDATA 3 0 41755 2 22 ENDSUBENT 21 0 41755 299999 SUBENT 41755003 20230118 421341755 3 1 BIB 4 9 41755 3 2 REACTION (39-Y-89(N,2N)39-Y-88,,SIG,,FIS) 41755 3 3 SAMPLE Placed at 300 mm distance from the light water 41755 3 4 moderator (5 cm thickness) surface. 41755 3 5 Yttrium, 99.99% purity, 0.154 g 7 x 7 x 0.64 mm 41755 3 6 DECAY-DATA (39-Y-88,106.627D,DG,898.042,0.937, 41755 3 7 DG,1836.063,0.992) 41755 3 8 STATUS (TABLE,,M.Schulc+,J,RPC,206,110804,2023) 41755 3 9 Table 5 - data, Table 4 - uncertainties. 41755 3 10 (SUPPL,41755007) Spectrum at sample position 41755 3 11 ENDBIB 9 0 41755 3 12 COMMON 4 3 41755 3 13 ERR-1 ERR-S ERR-2 ERR-3 41755 3 14 PER-CENT PER-CENT PER-CENT PER-CENT 41755 3 15 3.01 1.51 1.52 3.53 41755 3 16 ENDCOMMON 3 0 41755 3 17 DATA 3 1 41755 3 18 MISC DATA ERR-T 41755 3 19 MEV MB PER-CENT 41755 3 20 13.86 2.62E-01 5.1 41755 3 21 ENDDATA 3 0 41755 3 22 ENDSUBENT 21 0 41755 399999 SUBENT 41755004 20230118 421341755 4 1 BIB 4 9 41755 4 2 REACTION (28-NI-58(N,X)27-CO-57,,SIG,,FIS) 41755 4 3 SAMPLE Placed at 300 mm distance from the light water 41755 4 4 moderator (5 cm thickness) surface. 41755 4 5 Nickel natural, 99.99% purity, several pieces of 41755 4 6 2.60 - 2.90 mg, 5 x 5 x 0.1 mm 41755 4 7 DECAY-DATA (27-CO-57,271.74D,DG,122.06065,0.8560) 41755 4 8 STATUS (TABLE,,M.Schulc+,J,RPC,206,110804,2023) 41755 4 9 Table 5 - data, Table 4 - uncertainties. 41755 4 10 (SUPPL,41755007) Spectrum at sample position 41755 4 11 ENDBIB 9 0 41755 4 12 COMMON 4 3 41755 4 13 ERR-1 ERR-S ERR-2 ERR-3 41755 4 14 PER-CENT PER-CENT PER-CENT PER-CENT 41755 4 15 3.49 1.30 1.52 3.28 41755 4 16 ENDCOMMON 3 0 41755 4 17 DATA 3 1 41755 4 18 MISC DATA ERR-T 41755 4 19 MEV MB PER-CENT 41755 4 20 12.80 3.30E-01 5.2 41755 4 21 ENDDATA 3 0 41755 4 22 ENDSUBENT 21 0 41755 499999 SUBENT 41755005 20230118 421341755 5 1 BIB 4 8 41755 5 2 REACTION (26-FE-54(N,P)25-MN-54,,SIG,,FIS) 41755 5 3 SAMPLE Placed at 300 mm distance from the light water 41755 5 4 moderator (5 cm thickness) surface. 41755 5 5 54Fe, 99.4% purity, 0.651 g 14 x 14 x 0.01 mm 41755 5 6 DECAY-DATA (25-MN-54,312.2D,DG,834.848,0.99976) 41755 5 7 STATUS (TABLE,,M.Schulc+,J,RPC,206,110804,2023) 41755 5 8 Table 5 - data, Table 4 - uncertainties. 41755 5 9 (SUPPL,41755007) Spectrum at sample position 41755 5 10 ENDBIB 8 0 41755 5 11 COMMON 4 3 41755 5 12 ERR-1 ERR-S ERR-2 ERR-3 41755 5 13 PER-CENT PER-CENT PER-CENT PER-CENT 41755 5 14 2.95 1.59 1.52 3.08 41755 5 15 ENDCOMMON 3 0 41755 5 16 DATA 3 1 41755 5 17 MISC DATA ERR-T 41755 5 18 MEV MB PER-CENT 41755 5 19 4.38 8.25E+01 5.4 41755 5 20 ENDDATA 3 0 41755 5 21 ENDSUBENT 20 0 41755 599999 SUBENT 41755006 20230118 421341755 6 1 BIB 4 10 41755 6 2 REACTION (22-TI-46(N,P)21-SC-46,,SIG,,FIS) 41755 6 3 SAMPLE Placed at 300 mm distance from the light water 41755 6 4 moderator (5 cm thickness) surface. 41755 6 5 Titanium natural, 99.99% purity, 41755 6 6 0.283 g 15 x 15 x 0.2 mm 41755 6 7 DECAY-DATA (21-SC-46-G,83.79D,DG,889.277,0.99984, 41755 6 8 DG,1120.545,0.99987) 41755 6 9 STATUS (TABLE,,M.Schulc+,J,RPC,206,110804,2023) 41755 6 10 Table 5 - data, Table 4 - uncertainties. 41755 6 11 (SUPPL,41755007) Spectrum at sample position 41755 6 12 ENDBIB 10 0 41755 6 13 COMMON 4 3 41755 6 14 ERR-1 ERR-S ERR-2 ERR-3 41755 6 15 PER-CENT PER-CENT PER-CENT PER-CENT 41755 6 16 2.80 1.80 1.52 3.11 41755 6 17 ENDCOMMON 3 0 41755 6 18 DATA 3 1 41755 6 19 MISC DATA ERR-T 41755 6 20 MEV MB PER-CENT 41755 6 21 6.00 1.25E+01 4.8 41755 6 22 ENDDATA 3 0 41755 6 23 ENDSUBENT 22 0 41755 699999 SUBENT 41755007 20230118 421341755 7 1 BIB 3 122 41755 7 2 SUPPL-INF (INCSP) Calculated neutron spectrum at sample position:41755 7 3 E,MeV Flux n/cm2 41755 7 4 1.E-11 0. 41755 7 5 2.1544E-11 0. 41755 7 6 4.6416E-11 2.74302E-14 41755 7 7 1.E-10 7.84779E-13 41755 7 8 1.5849E-10 1.29797E-12 41755 7 9 2.5119E-10 4.96749E-12 41755 7 10 3.9811E-10 1.81841E-11 41755 7 11 6.7607E-10 4.91386E-11 41755 7 12 7.4199E-10 2.01381E-11 41755 7 13 8.1804E-10 2.6945E-11 41755 7 14 9.0642E-10 2.72725E-11 41755 7 15 1.0099E-9 4.81287E-11 41755 7 16 1.1322E-9 4.54673E-11 41755 7 17 1.2782E-9 6.93789E-11 41755 7 18 1.4543E-9 8.71585E-11 41755 7 19 1.6695E-9 1.34756E-10 41755 7 20 1.9362E-9 1.86361E-10 41755 7 21 2.2723E-9 2.83773E-10 41755 7 22 2.7043E-9 4.75966E-10 41755 7 23 3.2722E-9 9.31833E-10 41755 7 24 3.9811E-9 1.36759E-9 41755 7 25 5.0119E-9 1.98647E-9 41755 7 26 6.3096E-9 3.00078E-9 41755 7 27 7.9433E-9 4.8152E-9 41755 7 28 1.E-8 7.54381E-9 41755 7 29 1.2589E-8 1.27134E-8 41755 7 30 1.5849E-8 1.64282E-8 41755 7 31 1.9953E-8 2.42724E-8 41755 7 32 2.5119E-8 3.72912E-8 41755 7 33 3.1623E-8 4.5505E-8 41755 7 34 3.9811E-8 5.93522E-8 41755 7 35 5.0119E-8 7.15053E-8 41755 7 36 6.3096E-8 7.73596E-8 41755 7 37 7.9433E-8 7.4814E-8 41755 7 38 1.E-7 6.96902E-8 41755 7 39 1.2589E-7 5.33236E-8 41755 7 40 1.5849E-7 4.09989E-8 41755 7 41 1.9953E-7 2.96343E-8 41755 7 42 2.5119E-7 2.47826E-8 41755 7 43 3.1623E-7 2.38501E-8 41755 7 44 3.9811E-7 2.47874E-8 41755 7 45 5.0119E-7 2.72819E-8 41755 7 46 6.3096E-7 2.80568E-8 41755 7 47 7.9433E-7 3.05669E-8 41755 7 48 1.E-6 3.24339E-8 41755 7 49 1.2589E-6 3.38998E-8 41755 7 50 1.5849E-6 3.562E-8 41755 7 51 1.9953E-6 3.81081E-8 41755 7 52 2.5119E-6 4.08504E-8 41755 7 53 3.1623E-6 4.34971E-8 41755 7 54 3.9811E-6 4.50909E-8 41755 7 55 5.0119E-6 4.74748E-8 41755 7 56 6.3096E-6 4.92606E-8 41755 7 57 7.9433E-6 4.99774E-8 41755 7 58 1.E-5 5.04001E-8 41755 7 59 1.2589E-5 5.24473E-8 41755 7 60 1.5849E-5 5.35301E-8 41755 7 61 1.9953E-5 5.67949E-8 41755 7 62 2.5119E-5 5.62296E-8 41755 7 63 3.1623E-5 5.79342E-8 41755 7 64 3.9811E-5 5.86622E-8 41755 7 65 5.0119E-5 5.69485E-8 41755 7 66 6.3096E-5 5.82746E-8 41755 7 67 7.9433E-5 5.94067E-8 41755 7 68 1.E-4 5.9009E-8 41755 7 69 1.2589E-4 5.79883E-8 41755 7 70 1.5849E-4 5.8147E-8 41755 7 71 1.9953E-4 5.79708E-8 41755 7 72 2.5119E-4 5.86562E-8 41755 7 73 3.1623E-4 5.80122E-8 41755 7 74 3.9811E-4 5.56515E-8 41755 7 75 5.0119E-4 5.74459E-8 41755 7 76 6.3096E-4 5.66016E-8 41755 7 77 7.9433E-4 5.54283E-8 41755 7 78 0.001 5.36895E-8 41755 7 79 0.00126 5.57214E-8 41755 7 80 0.00158 5.88888E-8 41755 7 81 0.002 6.00154E-8 41755 7 82 0.00251 5.94165E-8 41755 7 83 0.00316 5.86516E-8 41755 7 84 0.00398 5.9627E-8 41755 7 85 0.00501 5.83776E-8 41755 7 86 0.00631 5.88888E-8 41755 7 87 0.00794 5.88694E-8 41755 7 88 0.01 5.77586E-8 41755 7 89 0.01259 5.73803E-8 41755 7 90 0.01585 5.64594E-8 41755 7 91 0.01995 6.13688E-8 41755 7 92 0.02512 2.57096E-7 41755 7 93 0.03162 9.78319E-8 41755 7 94 0.03981 5.86453E-8 41755 7 95 0.05012 7.84737E-8 41755 7 96 0.0631 8.94533E-8 41755 7 97 0.07943 1.62366E-7 41755 7 98 0.1 1.54022E-7 41755 7 99 0.12589 1.3307E-7 41755 7 100 0.15849 2.29553E-7 41755 7 101 0.19953 2.44838E-7 41755 7 102 0.25119 1.9398E-7 41755 7 103 0.31623 3.53431E-7 41755 7 104 0.39811 2.68896E-7 41755 7 105 0.50119 1.7455E-7 41755 7 106 0.63096 2.44417E-7 41755 7 107 0.79433 1.94367E-7 41755 7 108 1. 1.11095E-7 41755 7 109 1.2589 9.00792E-8 41755 7 110 1.5849 7.15966E-8 41755 7 111 1.9953 6.34739E-8 41755 7 112 2.5119 6.02879E-8 41755 7 113 3.1623 4.53723E-8 41755 7 114 3.9811 2.71069E-8 41755 7 115 5.0119 2.24539E-8 41755 7 116 6.3096 1.41208E-8 41755 7 117 7.9433 7.7068E-9 41755 7 118 10. 2.72163E-9 41755 7 119 12.589 7.23592E-10 41755 7 120 15.849 1.77134E-10 41755 7 121 19.953 1.2553E-11 41755 7 122 STATUS (TABLE) From M.Schulc 41755 7 123 HISTORY (20230824R) 41755 7 124 ENDBIB 122 0 41755 7 125 NOCOMMON 0 0 3 41755 7 126 NODATA 0 0 1 41755 7 127 ENDSUBENT 126 0 41755 799999 ENDENTRY 7 0 4175599999999