ENTRY 30767 20010402 00003076700000001 SUBENT 30767001 20010402 00003076700100001 BIB 13 38 3076700100002 TITLE Yields of fission products with masses A=131 to 135 3076700100003 for the fast neutron induced fission of U-238. 3076700100004 AUTHOR (E.DOBREVA,N.NENOFF) 3076700100005 INSTITUTE (3BULSOF) 3076700100006 REFERENCE (J,JRN,81,29,198401) Experimental details, mass chain 3076700100007 analysis, absolute yields 3076700100008 (J,GUS,70-71,3,197900) Additional details on experiment3076700100009 and analysis, relative and fractional iodine yields 3076700100010 (P,INDC(BUL)-5,1,198105)very brief information, no data3076700100011 FACILITY (REAC,3BULBLA) 3076700100012 INC-SPECT Reactor pile spectrum, sample wrapped in cadmium foil 3076700100013 to reduce thermal neutron component; 3076700100014 neutron flux = 10**11 neutrons/cm2/s 3076700100015 SAMPLE 500 mg containg natural uranium as UO2(NO3)2 3076700100016 METHOD 5 samples, each irradiated for 10 min 3076700100017 (RCHEM) performed at fixed separation times of 8, 30, 3076700100018 75, 261 and 1177 min after the end of irradiation. 3076700100019 Purified iodine precipitated as AgI, filtered, 3076700100020 enclosed in polyethylene and covered with Al-foil for 3076700100021 counting. 3076700100022 (GSPEC) of separated samples at varying cooling times 3076700100023 after the fixed separation times. 3076700100024 DETECTOR (GELI) of 26 cm3 coupled to 4000-channel analyzer 3076700100025 ANALYSIS Equations for growth and decay were set up describing 3076700100026 the genetic relationships beween fission products in 3076700100027 the investigated mass chains A=131-135. 3076700100028 Genetic relationships: for A=131 see SE3: DECAY DATA; 3076700100029 for A=132-135 they were taken from R.W. Parsons and 3076700100030 H.D. Sharma, J.Inorg.Nucl.Chem. 36(1974)2392. 3076700100031 Independent yields were derived by least squares 3076700100032 analysis of curves obtained from different samples at 3076700100033 different separation times. 3076700100034 CORRECTION For decay and buildup as described above.No corrections3076700100035 necessary for chemical yield as all activities were in 3076700100036 the same samples for a given run. 3076700100037 ERR-ANALYS The data are averages of 4-16 determinations. No 3076700100038 information is given on the derivation of errors. 3076700100039 HISTORY (20010330C) ML. 3076700100040 ENDBIB 38 0 3076700100041 COMMON 1 3 3076700100042 EN-DUMMY 3076700100043 MEV 3076700100044 1. 3076700100045 ENDCOMMON 3 0 3076700100046 ENDSUBENT 45 0 3076700199999 SUBENT 30767002 20010402 00003076700200001 BIB 3 13 3076700200002 REACTION 1((92-U-238(N,F)ELEM/MASS,IND,FY,,SPA)/ 3076700200003 (92-U-238(N,F)53-I-135,CUM,FY,,SPA)) 3076700200004 2((92-U-238(N,F)ELEM/MASS,IND,FY,,SPA)/ 3076700200005 (92-U-238(N,F)MASS,CHN,FY,,SPA)) 3076700200006 DECAY-DATA (53-I-132,,DG,667.7,0.98, 3076700200007 DG,772.7,0.75) 3076700200008 (53-I-133,,DG,529.5,0.87, 3076700200009 DG,875.3,0.045) 3076700200010 (53-I-134,,DG,847.08,0.957, 3076700200011 DG,884.18,0.649) 3076700200012 (53-I-135,,DG,1131.6,0.221, 3076700200013 DG,1260.5,0.291) 3076700200014 STATUS Data taken from Table 3 of God.Sof.Univ. 70-71(1979)3 3076700200015 ENDBIB 13 0 3076700200016 NOCOMMON 0 0 3076700200017 DATA 6 3 3076700200018 ELEMENT MASS DATA 1DATA-ERR 1DATA 2DATA-ERR 23076700200019 NO-DIM NO-DIM NO-DIM NO-DIM NO-DIM NO-DIM 3076700200020 53. 132. 0.00295 0.00080 0.0038 0.0010 3076700200021 53. 133. 0.032 0.003 0.0279 0.0027 3076700200022 53. 134. 0.123 0.011 0.0995 0.0089 3076700200023 ENDDATA 5 0 3076700200024 ENDSUBENT 23 0 3076700299999 SUBENT 30767003 20010402 00003076700300001 BIB 4 36 3076700300002 REACTION 1(92-U-238(N,F)ELEM/MASS,CUM,FY,,SPA) 3076700300003 2(92-U-238(N,F)ELEM/MASS,IND,FY,,SPA) 3076700300004 3(92-U-238(N,F)MASS,CHN,FY,,SPA) 3076700300005 MONITOR Compiler's note: 3076700300006 All yields were determined relative to the cumulative 3076700300007 yield of I-235. However, the absolute yield of I-235 3076700300008 was obtained in this experiment via a fit of the 3076700300009 relative derived chain yields for A=132 and A=134 to 3076700300010 the absolute chain yields from the evaluation of 3076700300011 E.A.C. Crouch, At.Data.Nucl.Data Tables 19(1977)417. 3076700300012 Therefore the reference yield for I-135 is included in 3076700300013 the data table. 3076700300014 DECAY-DATA The data for half lives and branching ratios for mass 3076700300015 chain 131 were taken from: 3076700300016 1. Table of Isotopes, 17th edition, 1978 (C.M.Lederer, 3076700300017 V.S.Shirley, editors) 3076700300018 2. R.L.Auble, Nuclear Data Sheets 17 (1976) 573. 3076700300019 (50-SN-131,62.9SEC) 3076700300020 (51-SB-131,23.MIN,B-,,0.099) to Te-131-m 3076700300021 (51-SB-131,23.MIN,B-,,0.901) to Te-131-g 3076700300022 (52-TE-131-M,30.HR,B-,,0.778) to I-131 3076700300023 (52-TE-131-M,30.HR,DG,,0.222) IT to Te-131-g 3076700300024 (53-I-131,8.04D,DG,364.5,0.81) 3076700300025 The origin of the decay data for I-135 is not given. 3076700300026 Compiler's note: the latter differ from those given in 3076700300027 subentry 2. 3076700300028 (53-I-135,,DG,1131.5,0.228, 3076700300029 DG,1260.4,0.29) 3076700300030 For decay chains A=132-134 the decay data given in 3076700300031 subentry 2 were used (for genetic relationships see 3076700300032 also subentry 1 under ANALYSIS). 3076700300033 STATUS Data taken from Table 3 of J.Rad.Nucl.Chem. 81(1984)29 3076700300034 (DEP,30767002) ratios to I-135 cumulative yield: the 3076700300035 independent yields of I-132,3,4 in the data table are 3076700300036 calculated by multiplying the corresponding relative 3076700300037 yields in 30767002 by the I-135 cumulative yield. 3076700300038 ENDBIB 36 0 3076700300039 NOCOMMON 0 0 3076700300040 DATA 9 16 3076700300041 MASS ELEMENT DATA 1DATA-ERR 1DATA 2DATA-ERR 23076700300042 DATA-MAX 2DATA 3DATA-ERR 3 3076700300043 NO-DIM NO-DIM PC/FIS PC/FIS PC/FIS PC/FIS 3076700300044 PC/FIS PC/FIS PC/FIS 3076700300045 131. 51. 2.87 0.15 3076700300046 3076700300047 131. 52. 3076700300048 0.12 3076700300049 131. 53. 3076700300050 0.001 3076700300051 131. 3076700300052 2.99 0.15 3076700300053 132. 52. 4.92 0.16 3076700300054 3076700300055 132. 53. 0.018 0.0005 3076700300056 3076700300057 132. 3076700300058 4.94 0.16 3076700300059 133. 51. 3.99 0.29 3076700300060 3076700300061 133. 52. 2.91 0.18 3076700300062 3076700300063 133. 53. 0.199 0.040 3076700300064 3076700300065 133. 3076700300066 7.10 0.35 3076700300067 134. 52. 6.82 0.22 3076700300068 3076700300069 134. 53. 0.77 0.07 3076700300070 3076700300071 134. 3076700300072 7.60 0.23 3076700300073 135. 53. 6.23 0.21 3076700300074 3076700300075 135. 3076700300076 6.34 0.30 3076700300077 ENDDATA 36 0 3076700300078 ENDSUBENT 77 0 3076700399999 SUBENT 30767004 20010402 00003076700400001 BIB 3 7 3076700400002 REACTION 1(92-U-238(N,F)ELEM,CHG,FY,,SPA) 3076700400003 2(92-U-238(N,F)ELEM,,AP,,SPA) 3076700400004 ANALYSIS The data in this subentry have been derived by a least 3076700400005 squares fit to the tellurium independent yields given 3076700400006 in subentry 3. 3076700400007 STATUS Data taken from J.Rad.Nucl.Chem. 81(1984)29, text on 3076700400008 page 35. 3076700400009 ENDBIB 7 0 3076700400010 NOCOMMON 0 0 3076700400011 DATA 5 1 3076700400012 ELEMENT DATA 1DATA-ERR 1DATA 2DATA-ERR 2 3076700400013 NO-DIM PC/FIS PC/FIS NO-DIM NO-DIM 3076700400014 52. 12.82 0.78 134.1 0.1 3076700400015 ENDDATA 3 0 3076700400016 ENDSUBENT 15 0 3076700499999 ENDENTRY 4 0 3076799999999