ENTRY 30768 20211116 32033076800000001 SUBENT 30768001 20211116 32033076800100001 BIB 15 72 3076800100002 INSTITUTE (3INDBHU) 3076800100003 REFERENCE (J,NIM/B,24-25,501,1987) 3076800100004 AUTHOR (S.Ram,N.L.Singh,S.K.Bose,J.Rama Rao) 3076800100005 TITLE Absolute yields of some fission products in the fast 3076800100006 neutron induced fission of 238U 3076800100007 FACILITY (VDG) 3076800100008 INC-SOURCE (D-T) flux=2.26*10E+9 n/cm2/s 3076800100009 SAMPLE About 1 mg of solid uarnyl nitrate 3076800100010 METHOD (ABSFY)'Track-etch-cum-gamma-ray spectrometry' combined3076800100011 with absolute fission counting. 3076800100012 (STTA) The sample was irradiated together with a monito3076800100013 tube on either side in neutron beam direction. 3076800100014 (FISCT).Aqueous solution of uranyl nitrate, irradiated 3076800100015 in a thin glass tube containing the Lexan plastic 3076800100016 fission detector. Fission tracks were counted with an 3076800100017 optical microscope. The track density was determined. 3076800100018 (FPGAM).of the solid sample. 3076800100019 DETECTOR (TRD) Lexan plastic fission track detector 3076800100020 The efficiency for track registration in solution has 3076800100021 been determined by comparison with another Lexan 3076800100022 detector on which a known amount of solution was 3076800100023 evaporated. 3076800100024 (HPGE).,precalibrated,resolution: 2 keV at 1.33 MeV, 3076800100025 coupled to a multichannel analyser. 3076800100026 The detector efficiency for the measured fission 3076800100027 product gamma-rays is given in Table 1 of Nucl.Instr. 3076800100028 Meth.Phys.Res. B24/25(1987)501. 3076800100029 ANALYSIS The total number of fissions was derived from the 3076800100030 fission track density taking into account: 3076800100031 - weight of the fissile material 3076800100032 - efficiency for track registration in solution 3076800100033 - concentration of target material in solution. 3076800100034 Details are given in Nucl.Instr.Meth.Phys.Res.B24/25 3076800100035 Fission yields are derived from measured activities 3076800100036 and total number of fissions using a standard formula 3076800100037 containing factors for decay during irradiation, 3076800100038 cooling and data accumulation. 3076800100039 Compiler's comment: the formula does not account for 3076800100040 any precursors in decay. 3076800100041 ERR-ANALYS (DATA-ERR) No information 3076800100042 COMMENT by compiler: the following information pertinent to 3076800100043 evaluators is missing or insufficient in the paper: 3076800100044 - exact value of the neutron energy; 3076800100045 - duration of irradiation, cooling and measurements; 3076800100046 - analysis of gamma-spectra: interfering peaks, 3076800100047 uncertainties involved; 3076800100048 - genetic parent-daughter relationships; details on the3076800100049 way yields were obtained; 3076800100050 - error analysis: types and numerical values of 3076800100051 different error contributions involved/considered. 3076800100052 CRITIQUE by compiler ML: In the following cases it is unclear 3076800100053 what type of yield the values represent (or values are 3076800100054 doubtful): 3076800100055 1. Sb-126: shielded by 10E+5 year Sn-126 3076800100056 2. Sb-128 has a metastable state which is fed by beta 3076800100057 decay of Sn-128 but decays only to 3.6 % to Sb-128g.3076800100058 3. Te-131m is fed only in 6.8 % of Sb-131 beta decays. 3076800100059 The yield value given seems to be too high for the 3076800100060 cumulative yield of the metastable state. 3076800100061 These points need clarification. 3076800100062 by compiler VS: 3076800100063 1. Moved to subentry 003 with SF5=IND/M+ 3076800100064 2. Flag deleted 3076800100065 3. Flag deleted 3076800100066 STATUS (TABLE) Data taken from Table 1 of 3076800100067 Nucl.Instr.Meth.Phys.Res.B24/25(1987)501 3076800100068 HISTORY (19871204C) ML 3076800100069 (20010405U) ML. Bib updates. 3076800100070 (20211028A) VS 3076800100071 DECAY-DATA moved from 001 to 002 and 003. 3076800100072 002: Sb-126-G moved to new subentry 003 and flag 3076800100073 deleted. 3076800100074 ENDBIB 72 0 3076800100075 COMMON 1 3 3076800100076 EN 3076800100077 MEV 3076800100078 14. 3076800100079 ENDCOMMON 3 0 3076800100080 ENDSUBENT 79 0 3076800199999 SUBENT 30768002 20211116 32033076800200001 BIB 3 14 3076800200002 REACTION (92-U-238(N,F)ELEM/MASS,CUM,FY) 3076800200003 DECAY-DATA ((1.)42-MO-99,66.02HR,DG,739.4,0.126) 3076800200004 ((2.)48-CD-115-G,53.38HR,DG,527.7,0.339) 3076800200005 ((3.)48-CD-117-M,3.31HR,DG,564.4,0.152) 3076800200006 ((5.)51-SB-128-G,9.1HR,DG,314.1,0.610) 3076800200007 ((6.)52-TE-131-M,30.0HR,DG,773.7,0.380) 3076800200008 ((7.)56-BA-140,12.789D,DG,537.2,0.236) 3076800200009 ((8.)58-CE-141,32.55D,DG,145.0,0.484) 3076800200010 ((9.)61-PM-151,28.4HR,DG,167.7,0.077) 3076800200011 ((10.)63-EU-157,15.15HR,DG,410.6,0.190) 3076800200012 Data taken from C.M.Lederer, V.S.Shirley, Table of 3076800200013 Isotopes, 7th edition, 1978. 3076800200014 HISTORY (20211028A) VS. Sb-126-G moved to new subentry 003. 3076800200015 Flag deleted. 3076800200016 ENDBIB 14 0 3076800200017 NOCOMMON 0 0 3076800200018 DATA 6 9 3076800200019 ELEMENT MASS ISOMER DATA DATA-ERR DECAY-FLAG 3076800200020 NO-DIM NO-DIM NO-DIM PC/FIS PC/FIS NO-DIM 3076800200021 42. 99. 5.84 0.29 1. 3076800200022 48. 115. 0. 0.57 0.02 2. 3076800200023 48. 117. 1. 0.15 0.01 3. 3076800200024 51. 128. 0. 0.21 0.01 5. 3076800200025 52. 131. 1. 4.10 0.20 6. 3076800200026 56. 140. 4.34 0.17 7. 3076800200027 58. 141. 4.46 0.17 8. 3076800200028 61. 151. 0.89 0.04 9. 3076800200029 63. 157. 0.11 0.01 10. 3076800200030 ENDDATA 11 0 3076800200031 ENDSUBENT 30 0 3076800299999 SUBENT 30768003 20211116 32033076800300001 BIB 3 3 3076800300002 REACTION (92-U-238(N,F)51-SB-126-G,IND/M+,FY) 3076800300003 DECAY-DATA (51-SB-126-G,12.4D,DG,666.3,0.997) 3076800300004 HISTORY (20211028C) VS. 3076800300005 ENDBIB 3 0 3076800300006 NOCOMMON 0 0 3076800300007 DATA 2 1 3076800300008 DATA DATA-ERR 3076800300009 PC/FIS PC/FIS 3076800300010 0.25 0.01 3076800300011 ENDDATA 3 0 3076800300012 ENDSUBENT 11 0 3076800399999 ENDENTRY 3 0 3076899999999