ENTRY 23707 20200520 228823707 0 1 SUBENT 23707001 20200505 228823707 1 1 BIB 11 17 23707 1 2 TITLE Identification of new arsenic isotopes in fission: 23707 1 3 83As and 84As 23707 1 4 AUTHOR (P.del Marmol) 23707 1 5 REFERENCE (J,JIN,30,2873,1968) 23707 1 6 INSTITUTE (2BLGMOL) 23707 1 7 REL-REF (I,23708001,P.del Marmol+,J,JIN,29,273,1967) 23707 1 8 Irradiation facility and As separation method 23707 1 9 FACILITY (REAC,2BLGMOL) BR2 reactor 23707 1 10 INC-SOURCE (REAC) 23707 1 11 INC-SPECT Thermal neutrons. Flux ~1.E+9 n/(cm2*sec), 23707 1 12 was normalized by U-235 fission chamber monitor. 23707 1 13 SAMPLE Solution containing ~1 g of 90%-enriched U-235, 23707 1 14 As-76 tracer, 0.5 mg As+5, 5 mg Sb+5, 1 mg SeO(3)-- 23707 1 15 carriers in 30% H(2)SO(4). 23707 1 16 METHOD (CHSEP) 23707 1 17 Irradiation time - 20 sec for As-83, 10 sec for As-84. 23707 1 18 HISTORY (20200520C) M.M. 23707 1 19 ENDBIB 17 0 23707 1 20 COMMON 1 3 23707 1 21 EN-DUMMY 23707 1 22 EV 23707 1 23 0.0253 23707 1 24 ENDCOMMON 3 0 23707 1 25 ENDSUBENT 24 0 23707 199999 SUBENT 23707002 20200520 228823707 2 1 BIB 5 13 23707 2 2 REACTION (92-U-235(N,F)ELEM/MASS,CUM,FY,,FRC) 23707 2 3 DECAY-DATA (33-AS-83,14.1SEC) 14.1+-1.1 sec 23707 2 4 (34-SE-83-M,70.SEC) 23707 2 5 (33-AS-84,5.8SEC) 5.8+-0.5 sec 23707 2 6 ANALYSIS Cumulative fractional chain yield ( ratio of cumulative23707 2 7 yield to total chain yield) was determined by 23707 2 8 formulas (1) and (2) in J,JIN,30,2873,1968 . 23707 2 9 For As-84 - the contribution ~5% from neutron-decay of23707 2 10 As-85 was taken into account. 23707 2 11 ERR-ANALYS (DATA-ERR) Type of uncertainty is not explained in the 23707 2 12 article. 23707 2 13 STATUS (TABLE) Text page 2876 of 23707 2 14 J.of Inorganic and Nuclear Chemistry,v.30,p.2873,1968 23707 2 15 ENDBIB 13 0 23707 2 16 COMMON 1 3 23707 2 17 ELEMENT 23707 2 18 NO-DIM 23707 2 19 33. 23707 2 20 ENDCOMMON 3 0 23707 2 21 DATA 3 2 23707 2 22 MASS DATA DATA-ERR 23707 2 23 NO-DIM NO-DIM NO-DIM 23707 2 24 83. 0.80 0.08 23707 2 25 84. 0.17 0.02 23707 2 26 ENDDATA 4 0 23707 2 27 ENDSUBENT 26 0 23707 299999 SUBENT 23707003 20200520 228823707 3 1 BIB 5 11 23707 3 2 REACTION (92-U-235(N,F)MASS,SEC,ZP) 23707 3 3 DECAY-DATA (33-AS-83,14.1SEC) 14.1+-1.1 sec 23707 3 4 (34-SE-83-M,70.SEC) 23707 3 5 (33-AS-84,5.8SEC) 5.8+-0.5 sec 23707 3 6 ANALYSIS Calculated using Gaussian distribution for fractional 23707 3 7 chain yields and empirical constant 0.86+-0.15 for 23707 3 8 formula (4) 23707 3 9 ERR-ANALYS (DATA-ERR) Includes uncertainty of fractional chain 23707 3 10 yield and empirical constant. 23707 3 11 STATUS (TABLE) Text page 2878 of 23707 3 12 J.of Inorganic and Nuclear Chemistry,v.30,p.2873,1968 23707 3 13 ENDBIB 11 0 23707 3 14 NOCOMMON 0 0 23707 3 15 DATA 3 2 23707 3 16 MASS DATA DATA-ERR 23707 3 17 NO-DIM NO-DIM NO-DIM 23707 3 18 83. 32.96 0.24 23707 3 19 84. 34.04 0.10 23707 3 20 ENDDATA 4 0 23707 3 21 ENDSUBENT 20 0 23707 399999 SUBENT 23707004 20200520 228823707 4 1 BIB 6 15 23707 4 2 REACTION (92-U-235(N,F)ELEM/MASS,IND,FY,,FRC) 23707 4 3 DECAY-DATA (34-SE-83-M,70.SEC) 23707 4 4 (34-SE-83-G,22.6MIN) 23707 4 5 ANALYSIS Independent fractional yields were obtained from 23707 4 6 contribution of chain through Se-83m 0.59+-0.04 23707 4 7 ( obtained from two measurements, see REL-REFs) and 23707 4 8 measured cumulative fission yield of As-83. 23707 4 9 REL-REF (R,,J.R.Arnold+,J,JCP,15,703,1947) 0.78+-0.08 Se-83g/m 23707 4 10 (R,,I.F.Croall+,J,JIN,25,1213,1963) 0.62+-0.05 Se-83g/m23707 4 11 ERR-ANALYS (DATA-ERR) Large errors are due to the inherent errors 23707 4 12 of the method, to the high cumulative yield of As-83, 23707 4 13 to the closeness of the branching ratios of As-83 and 23707 4 14 of the fission chain. 23707 4 15 STATUS (TABLE) Text page 2880 of 23707 4 16 J.of Inorganic and Nuclear Chemistry,v.30,p.2873,1968 23707 4 17 ENDBIB 15 0 23707 4 18 COMMON 2 3 23707 4 19 ELEMENT MASS 23707 4 20 NO-DIM NO-DIM 23707 4 21 34. 83. 23707 4 22 ENDCOMMON 3 0 23707 4 23 DATA 4 2 23707 4 24 ISOMER DATA +DATA-ERR -DATA-ERR 23707 4 25 NO-DIM NO-DIM NO-DIM NO-DIM 23707 4 26 0. 0.12 0.08 0.08 23707 4 27 1. 0.08 0.09 0.08 23707 4 28 ENDDATA 4 0 23707 4 29 ENDSUBENT 28 0 23707 499999 ENDENTRY 4 0 2370799999999