ENTRY 41300 20240724 421841300000 1 SUBENT 41300001 20240724 421841300001 1 BIB 12 48 41300001 2 TITLE Measurements of the energy dependence of the relative 41300001 3 delayed neutron yields related to individual 41300001 4 precursors from neutron-induced fission of 237Np 41300001 5 AUTHOR (S.G.Isaev,V.M.Piksaykin,L.E.Kazakov,M.Z.Tarasko) 41300001 6 INSTITUTE (4RUSFEI) 41300001 7 REFERENCE (J,YK,,(1),17,1998) Main reference,data are given. 41300001 8 In English. 41300001 9 FACILITY (VDG,4RUSFEI) Electrostatic accelerator KG-2.5 41300001 10 DETECTOR (D4PI) Boron counter SNM-11 as assemblage of 41300001 11 30 counters distributed in polyethylene moderator - 41300001 12 for neutron detection. Energy dependence of detector 41300001 13 efficiency is calculated by Monte-Carlo method 41300001 14 (SOLST) Semiconductor surface-barrier detector for 41300001 15 Cf-252 fission events detection 41300001 16 (FISCH) Fission chamber for Np-237 fission events 41300001 17 detection 41300001 18 (PROPC) He-3 counter for neutron flux monitoring 41300001 19 INC-SOURCE (P-T) 41300001 20 (D-D) 41300001 21 MONITOR (98-CF-252(0,F),PR,NU) 41300001 22 (92-U-235(N,F),DL,NU) 41300001 23 METHOD (ACTIV) Cyclic irradiation and measurement 41300001 24 ERR-ANALYS (ERR-T) Total error 41300001 25 (ERR-S) Error due to fission counting statistics of 41300001 26 Np-237 41300001 27 (ERR-1) Error due to fission chamber deposit mass of 41300001 28 Np-237 41300001 29 (ERR-2) Error due to extrapolation to zero bias for 41300001 30 Np-237 41300001 31 (ERR-3) Error due to sample mass of Np-237 41300001 32 (ERR-4) Error due to delayed neutron counting 41300001 33 statistical error for Np 41300001 34 (ERR-5) Error due to background (two chamber geometry 41300001 35 for Np-237 41300001 36 (ERR-6) Statistical error caused by delayed neutrons 41300001 37 counts to fission fragments counts ratio 41300001 38 COMMENT This work was made under RFBR research grant 41300001 39 #96-02-17439. 41300001 40 HISTORY (19980925C) + + Compiled at the CJD + + 41300001 41 (19990319A) * * Corrected at CJD. 41300001 42 4-digit dates introduced 41300001 43 (20140721A) M.M. Upper -> lower case correction. 41300001 44 BIB information was updated. 41300001 45 Correction according to memo CP-D/777. 41300001 46 (20191112U) Ref. YK was corrected. 41300001 47 (20210414A) REACTION in Subent 002 was corrected 41300001 48 (20240724A) Subent 002 was corrected. 41300001 49 STATUS was updated for new rules. 41300001 50 ENDBIB 48 0 41300001 51 COMMON 8 6 41300001 52 E-LVL ERR-S ERR-1 ERR-2 ERR-3 ERR-4 41300001 53 ERR-5 ERR-6 41300001 54 EV PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 41300001 55 PER-CENT PER-CENT 41300001 56 0. 0.01 0.7 0.6 0.05 0.01 41300001 57 0.1 0.6 41300001 58 ENDCOMMON 6 0 41300001 59 ENDSUBENT 58 0 4130000199999 SUBENT 41300002 20240724 421841300002 1 BIB 7 49 41300002 2 REACTION ((93-NP-237(N,F),DL/GRP,NU)/ 41300002 3 (93-NP-237(N,F),DL,NU)) Relative 41300002 4 delayed neutrons yield from 8 individual precursors 41300002 5 and 4 groups of precursors. 41300002 6 RESULT (DFRCT) 41300002 7 SAMPLE NpO(2) oxide powder, density 7 g/cm3, packed in 41300002 8 stainless-steel capsule placed in titanium container. 41300002 9 Sample weight is 2.2810 gram 41300002 10 DECAY-DATA Individual precursors: 41300002 11 (35-BR-87,55.69SEC) 41300002 12 (35-BR-88,16.3SEC) 41300002 13 (35-BR-89,4.38SEC) 41300002 14 (35-BR-91,0.542SEC) 41300002 15 (36-KR-93,1.289SEC) 41300002 16 (37-RB-94,2.76SEC) 41300002 17 (37-RB-95,0.384SEC) 41300002 18 (53-I-137,24.5SEC) 41300002 19 Precursors combined in groups with effective HL: 41300002 20 6.37SEC : 41300002 21 (53-I-138,6.46SEC) 41300002 22 (37-RB-93,5.93SEC) 41300002 23 2.09SEC : 41300002 24 (53-I-139,2.3SEC) 41300002 25 (33-AS-85,2.08SEC) 41300002 26 (39-Y-98-M,2.0SEC) 41300002 27 0.195SEC : 41300002 28 (37-RB-96,0.203SEC) 41300002 29 (37-RB-97,0.17SEC) 41300002 30 0.942SEC : 41300002 31 (55-CS-144,1.002SEC) 41300002 32 (53-I-140,0.86SEC) 41300002 33 ERR-ANALYS (EN-ERR) Standard deviations in incident neutron energy41300002 34 STATUS (TABLE,,S.G.Isaev,J,YK,,(1),17,1998) Data from Table 2 41300002 35 (COREL,41322002) 6-group expression of data from the 41300002 36 same measurement. 41300002 37 HISTORY (19990319A) Reaction coding changed 41300002 38 (20140721A) GRP code was deleted from SF5 of REACTION 41300002 39 according to comment of N.Otsuka (NDS,IAEA). 41300002 40 HALF-LIFE values were moved in DECAY-DATA. 41300002 41 (20191112U) IND was added in reaction denominator 41300002 42 (20210414A) REACTION was corrected: 41300002 43 )ELEM/MASS,DL,NU) -> ),DL/GRP,NU)( first term); 41300002 44 DL/IND -> DL (second term). 41300002 45 ELEMENT, MASS, ISOMER were deleted from DATA block, 41300002 46 they are given in DECAY-DATA for specified half-life. 41300002 47 (20240724A) ERR-T : 0.000 -> 0.0010 at EN=4.719 MeV 41300002 48 ( taking into account ERR-T values at neighbouring 41300002 49 points - 0.0059+-0.0011, 0.0052+-0.0009; one digit 41300002 50 was lost at the right side of this table). 41300002 51 ENDBIB 49 0 41300002 52 NOCOMMON 0 0 41300002 53 DATA 5 60 41300002 54 EN EN-ERR HL DATA ERR-T 41300002 55 MEV MEV SEC NO-DIM NO-DIM 41300002 56 0.586 0.078 0.195 0.022 0.004 41300002 57 0.586 0.078 0.384 0.073 0.017 41300002 58 0.586 0.078 0.542 0.018 0.003 41300002 59 0.586 0.078 0.942 0.013 0.002 41300002 60 0.586 0.078 1.289 0.0044 0.0008 41300002 61 0.586 0.078 2.09 0.257 0.012 41300002 62 0.586 0.078 2.76 0.129 0.012 41300002 63 0.586 0.078 4.38 0.090 0.007 41300002 64 0.586 0.078 6.37 0.075 0.004 41300002 65 0.586 0.078 16.3 0.105 0.005 41300002 66 0.586 0.078 24.5 0.185 0.006 41300002 67 0.586 0.078 55.69 0.030 0.001 41300002 68 1.008 0.099 0.195 0.023 0.004 41300002 69 1.008 0.099 0.384 0.077 0.017 41300002 70 1.008 0.099 0.542 0.019 0.004 41300002 71 1.008 0.099 0.942 0.013 0.002 41300002 72 1.008 0.099 1.289 0.0046 0.0008 41300002 73 1.008 0.099 2.09 0.257 0.011 41300002 74 1.008 0.099 2.76 0.129 0.012 41300002 75 1.008 0.099 4.38 0.092 0.007 41300002 76 1.008 0.099 6.37 0.079 0.003 41300002 77 1.008 0.099 16.3 0.101 0.005 41300002 78 1.008 0.099 24.5 0.176 0.005 41300002 79 1.008 0.099 55.69 0.031 0.001 41300002 80 3.745 0.144 0.195 0.026 0.005 41300002 81 3.745 0.144 0.384 0.091 0.020 41300002 82 3.745 0.144 0.542 0.021 0.004 41300002 83 3.745 0.144 0.942 0.015 0.003 41300002 84 3.745 0.144 1.289 0.0052 0.0009 41300002 85 3.745 0.144 2.09 0.261 0.011 41300002 86 3.745 0.144 2.76 0.130 0.012 41300002 87 3.745 0.144 4.38 0.094 0.007 41300002 88 3.745 0.144 6.37 0.083 0.003 41300002 89 3.745 0.144 16.3 0.085 0.004 41300002 90 3.745 0.144 24.5 0.153 0.005 41300002 91 3.745 0.144 55.69 0.035 0.001 41300002 92 4.196 0.169 0.195 0.029 0.005 41300002 93 4.196 0.169 0.384 0.088 0.020 41300002 94 4.196 0.169 0.542 0.024 0.005 41300002 95 4.196 0.169 0.942 0.017 0.003 41300002 96 4.196 0.169 1.289 0.0059 0.0011 41300002 97 4.196 0.169 2.09 0.254 0.011 41300002 98 4.196 0.169 2.76 0.140 0.013 41300002 99 4.196 0.169 4.38 0.095 0.007 41300002 100 4.196 0.169 6.37 0.070 0.003 41300002 101 4.196 0.169 16.3 0.112 0.005 41300002 102 4.196 0.169 24.5 0.126 0.004 41300002 103 4.196 0.169 55.69 0.040 0.001 41300002 104 4.719 0.205 0.195 0.027 0.005 41300002 105 4.719 0.205 0.384 0.088 0.020 41300002 106 4.719 0.205 0.542 0.022 0.004 41300002 107 4.719 0.205 0.942 0.015 0.003 41300002 108 4.719 0.205 1.289 0.0054 0.0010 41300002 109 4.719 0.205 2.09 0.259 0.011 41300002 110 4.719 0.205 2.76 0.136 0.012 41300002 111 4.719 0.205 4.38 0.098 0.007 41300002 112 4.719 0.205 6.37 0.083 0.003 41300002 113 4.719 0.205 16.3 0.088 0.005 41300002 114 4.719 0.205 24.5 0.141 0.005 41300002 115 4.719 0.205 55.69 0.037 0.001 41300002 116 ENDDATA 62 0 41300002 117 ENDSUBENT 116 0 4130000299999 ENDENTRY 2 0 4130099999999