ENTRY 31525 20030321 00003152500000001 SUBENT 31525001 20030321 00003152500100001 BIB 13 47 3152500100002 INSTITUTE (3CPRAEP) 3152500100003 REFERENCE (C,88MITO,,967,198805) 3152500100004 (J,CNP,7,(2),97,198505) Li Ze et al: referred to in 3152500100005 this work as to where information can be found how 3152500100006 fission yields were calculated from the measured data. 3152500100007 This includes information on ANALYSIS, CORRECTION and 3152500100008 ERR-ANALYS. See also EXFOR30751. 3152500100009 AUTHOR (Qi Linkun,Liu Conggui,Tang Peijia,Li Ze,Wang Xiuzhi, 3152500100010 Liu Yonghui,Liu Daming,Ju Changxin,Lu Huijun, 3152500100011 Zhu Jiaxuan,Guo Jingru) 3152500100012 TITLE Mass Distribution in Fission Spectrum Neutron Induced 3152500100013 Fission of U-235 3152500100014 INC-SPECT U-235 fission spectrum neutrons; the sample was 3152500100015 surrounded by thick layers of 1.0 cm boron carbide and 3152500100016 0.1 cm cadmium to shield it from slow neutrons. 3152500100017 INC-SOURCE Uranium plate enriched in U-235, put in the thermal 3152500100018 neutron beam of the institute's heavy water reactor. 3152500100019 Irradiations were made in a concrete and paraffin 3152500100020 shielded room of dimensions 3.5m x 3.0m x 2.2m. 3152500100021 SAMPLE Uranium metal disk, 1.6 cm diameter, 0.02 cm thick; 3152500100022 weight of samples ranged from 0.5 to 1.0 g; 3152500100023 isotopic composition: 1.1% U-234, 90.2% U-235, 3152500100024 0.3% U-236, 8.4% U-238 3152500100025 DETECTOR (FISCH)-double fission chamber 3152500100026 METHOD (FISCT)-absolute fission counting: 3152500100027 a sandwich of standard-sample-standard was placed in 3152500100028 the fission chamber, where the fission rates of the 3152500100029 standards were counted directly; standard: uranium 3152500100030 electrodeposited on platinum disk. The fission rate in 3152500100031 the sample was calculated from the weight ratio sample/3152500100032 standard. 3152500100033 ANALYSIS No information, see second reference. 3152500100034 CORRECTION No information, see second reference. 3152500100035 ERR-ANALYS Only the overall error is given as the square root of 3152500100036 the sum of squares of: 3152500100037 standard deviation of the average 3152500100038 and the errors of: 3152500100039 fission rate determination 3152500100040 error of fission rate determination 3152500100041 counting efficiency 3152500100042 chemical yield, 3152500100043 computerized gamma-spectrum analysis 3152500100044 correction for gamma-ray absorption in sample. 3152500100045 No details or values for individual error contributions3152500100046 are given; see second reference for more details. 3152500100047 HISTORY (20030129C) ML 3152500100048 (20030321U) OS Ref. coding corrected 3152500100049 ENDBIB 47 0 3152500100050 COMMON 1 3 3152500100051 EN-DUMMY 3152500100052 MEV 3152500100053 1.0 3152500100054 ENDCOMMON 3 0 3152500100055 ENDSUBENT 54 0 3152500199999 SUBENT 31525002 20030130 00003152500200001 BIB 8 36 3152500200002 REACTION 1(92-U-235(N,F)ELEM/MASS,CUM,FY,,FIS) Method 1: 3152500200003 Direct gamma-counting of fission products 3152500200004 2(92-U-235(N,F)ELEM/MASS,CUM,FY,,FIS) Method 2: 3152500200005 Radiochemical separation of fission products 3152500200006 ERR-ANALYS1(ERR-T) Overall error, method 1: see subentry 1 3152500200007 2(ERR-T) Overall error, method 2: see subentry 1 3152500200008 DECAY-DATA No information, see second reference. 3152500200009 METHOD 1(FPGAM) High-resolution gamma-spectrometry, spectrum 3152500200010 analysis by computer program. 7 samples were used. 3152500200011 2(RCHEM) Sample was dissolved in 6-10M HCl, fission 3152500200012 products extracted with carriers;standard radiochemical3152500200013 procedures were used to separate and purify the fission3152500200014 product samples for measurement.Chemical yields were 3152500200015 determined. Purified samples were measured by beta- or 3152500200016 gamma-counting (generally for 2-4 half lives). 3152500200017 6 samples were used. 3152500200018 Comment by compiler: to test the radiochemical method, 3152500200019 3 thermal fission yields were determined and were found3152500200020 to agree well with published yields. They are compiled 3152500200021 in entry EXFOR31526. 3152500200022 DETECTOR 1(GELI) 130 cm3, resolution: 1.85 keV at 1.33 MeV; 3152500200023 photopeak efficiency was determine with a set of 3152500200024 standard sources. 3152500200025 2For beta-measurements: 3152500200026 (PROPC)-2Pi-gas-flow proportional counter, or 3152500200027 (SCIN)-2Pi-plastic-scintillator; 3152500200028 for gamma-measurements: 3152500200029 (NAICR)-well type NaI(Tl),3x3 inch, anticoincidence 3152500200030 spectrometer. 3152500200031 FLAG (1.) Total chain yield, calculated using an isomer 3152500200032 ratio from: H.Ihara et al, JAERI-M 9715 (1981) or 3152500200033 L.E.Glendenin et al, Phys.Rev. C24 (1981) 2600. 3152500200034 COMMENT By compiler: The values given in the data table are 3152500200035 practically total chain yields. The element and isomer 3152500200036 given show the fission product measured. 3152500200037 STATUS Data taken from Table 1 of 88Mito,page 967. 3152500200038 ENDBIB 36 0 3152500200039 NOCOMMON 0 0 3152500200040 DATA 8 40 3152500200041 MASS ELEMENT ISOMER DATA 1ERR-T 1DATA 23152500200042 ERR-T 2FLAG 3152500200043 NO-DIM NO-DIM NO-DIM PC/FIS PC/FIS PC/FIS 3152500200044 PC/FIS NO-DIM 3152500200045 84. 35. 1.10 0.07 3152500200046 3152500200047 85. 36. 1. 1.35 0.09 3152500200048 1. 3152500200049 87. 36. 2.47 0.09 3152500200050 3152500200051 88. 36. 3.68 0.09 3152500200052 3152500200053 89. 37. 4.07 0.19 3152500200054 3152500200055 91. 39. 1. 5.39 0.18 3152500200056 1. 3152500200057 92. 39. 5.92 0.28 3152500200058 3152500200059 93. 39. 5.79 0.18 3152500200060 3152500200061 94. 39. 5.95 0.17 3152500200062 3152500200063 95. 40. 6.42 0.20 6.46 3152500200064 0.30 3152500200065 97. 40. 6.12 0.17 6.04 3152500200066 0.46 3152500200067 99. 42. 6.37 0.20 6.36 3152500200068 0.17 3152500200069 103. 44. 3.46 0.13 3152500200070 3152500200071 104. 43. 1.77 0.05 3152500200072 3152500200073 105. 45. 1.25 0.07 3152500200074 3152500200075 109. 46. 0.125 3152500200076 0.016 3152500200077 111. 47. 0.025 3152500200078 0.006 3152500200079 113. 47. 0. 0.019 3152500200080 0.009 1. 3152500200081 115. 48. 1. 0.019 3152500200082 0.004 1. 3152500200083 125. 50. 0. 0.048 3152500200084 0.015 1. 3152500200085 127. 51. 0.297 3152500200086 0.028 3152500200087 128. 50. 0.392 0.013 3152500200088 3152500200089 129. 51. 0.940 0.035 3152500200090 3152500200091 131. 53. 3.06 0.10 3152500200092 3152500200093 132. 52. 4.89 0.16 3152500200094 3152500200095 133. 53. 6.67 0.23 3152500200096 3152500200097 134. 52. 7.40 0.27 3152500200098 3152500200099 135. 53. 6.59 0.22 3152500200100 3152500200101 138. 54. 6.71 0.31 3152500200102 3152500200103 140. 56. 6.00 0.22 3152500200104 3152500200105 141. 58. 5.67 3152500200106 0.32 3152500200107 143. 58. 5.60 0.18 3152500200108 3152500200109 144. 58. 5.12 3152500200110 0.16 3152500200111 146. 59. 3.51 0.18 3152500200112 3152500200113 147. 60. 2.32 0.08 2.33 3152500200114 0.08 3152500200115 149. 60. 1.01 0.07 3152500200116 3152500200117 151. 61. 0.381 0.02 3152500200118 3152500200119 153. 62. 0.154 3152500200120 0.02 3152500200121 156. 63. 0.0186 3152500200122 0.002 3152500200123 161. 65. 0.000687 3152500200124 0.00006 3152500200125 ENDDATA 84 0 3152500200126 ENDSUBENT 125 0 3152500299999 SUBENT 31525003 20030130 00003152500300001 BIB 4 8 3152500300002 REACTION 1(92-U-235(N,F),,AP,LF,SPA) Mean mass of light fragment 3152500300003 2(92-U-235(N,F),,AP,HF,SPA) Mean mass of heavy fragment 3152500300004 ADD-RES Peak-to-valley ratio = 340 3152500300005 ERR-ANALYS No errors given. 3152500300006 STATUS (DEP,31525002) Derived from the measured mass yields 3152500300007 and data reflected around the symmetric mass. The 3152500300008 obtained sum of yields was 199.1%. 3152500300009 Data taken from text on page 970 of 88Mito. 3152500300010 ENDBIB 8 0 3152500300011 NOCOMMON 0 0 3152500300012 DATA 2 1 3152500300013 DATA 1DATA 2 3152500300014 NO-DIM NO-DIM 3152500300015 95.2 138.6 3152500300016 ENDDATA 3 0 3152500300017 ENDSUBENT 16 0 3152500399999 ENDENTRY 3 0 3152599999999