ENTRY 32798 20220901 32083279800000001 SUBENT 32798001 20220901 32083279800100001 BIB 14 79 3279800100002 TITLE Measurement of the U-238/U-235 fission cross section 3279800100003 ratio at CSNS-Back-n WNS 3279800100004 AUTHOR (Jie Wen, Yiwei Yang, Zhongwei Wen, Rong Liu, 3279800100005 Xingyan Liu, Zijie Han, Qiping Chen, Zhizhou Ren, 3279800100006 Qi An, Huaiyong Bai, Jie Bao, Ping Cao, Yonghao Chen, 3279800100007 Pinjing Cheng, Zengqi Cui, Ruirui Fan, Changqing Feng,3279800100008 Minhao Gu, Fengqin Guo, Changcai Han, Guozhu He, 3279800100009 Yongcheng He, Yuefeng He, Hanxiong Huang, 3279800100010 Weiling Huang, Xiru Huang, Xiaolu Ji, Xuyang Ji, 3279800100011 Haoyu Jiang, Wei Jiang, Hantao Jing, Ling Kang, 3279800100012 Mingtao Kang, Bo Li, Lun Li, Qiang Li, Xiao Li, 3279800100013 Yang Li, Yang Li, Shubin Liu, Guangyuan Luan, 3279800100014 Yinglin Ma, Changjun Ning, Binbin Qi, Jie Ren, 3279800100015 Xichao Ruan, Zhaohui Song, Hong Sun, Xiaoyang Sun, 3279800100016 Zhijia Sun, Zhixin Tan, Hongqing Tang, Jingyu Tang, 3279800100017 Pengcheng Wang, Qi Wang, Taofeng Wang, Yanfeng Wang, 3279800100018 Zhaohui Wang, Zheng Wang, Qingbiao Wu, Xiaoguang Wu, 3279800100019 Xuan Wu, Likun Xie, Han Yi, Li Yu, Tao Yu, Yongji Yu, 3279800100020 Guohui Zhang, Jing Zhang, Linhao Zhang, Liying Zhang, 3279800100021 Qingmin Zhang, Qiwei Zhang, Xianpeng Zhang, 3279800100022 Yuliang Zhang, Zhiyong Zhang, Yingtan Zhao, 3279800100023 Liang Zhou, Zuying Zhou, Danyang Zhu, Kejun Zhu, 3279800100024 Peng Zhu) 3279800100025 INSTITUTE (3CPRNPC,3CPRHST,3CPRBJG,3CPRAEP,3CPRIHP,3CPRNIX, 3279800100026 3CPRBHN) 3279800100027 (3CPRCPR) State Key Laboratory of Particle Detection 3279800100028 and Electronics, Chinese Academy of Sciences, Beijing 3279800100029 (3CPRCPR) Spallation Neutron Source Science Center, 3279800100030 Dongguan 3279800100031 (3CPRCPR) University of South China, Hengyang 3279800100032 (3CPRCPR) Xi'an Jiaotong University, Xi'an 3279800100033 REFERENCE (J,ANE,140,107301,2020) 3279800100034 #doi:10.1016/j.anucene.2019.107301 3279800100035 REL-REF (I,,J.Wen+,J,JINS,13,P07020,2018) 3279800100036 The FIC has been designed and tested 3279800100037 (I,,Yiwei Yang+,J,NIM/A,940,486,2019) 3279800100038 The FIC has been designed and tested 3279800100039 FACILITY (SYNCH,3CPRIHP) The Back-streaming white neutron 3279800100040 source (Back-n WNS) at China Spallation Neutron 3279800100041 Source (CSNS) 3279800100042 INC-SOURCE (SPALL) The neutron flux is about 7.03E6 /cm2s1 at 100 3279800100043 kW. The diameter of the neutron beam was 60 mm. 3279800100044 SAMPLE Sample thickness of 200-300 ug/cm2, diameter of 50 mm 3279800100045 and nonuniformity of less than 15%. The isotopic 3279800100046 purity of U-235 and U -238 sample were 99.985% and 3279800100047 99.998%, respectively. 3279800100048 DETECTOR (IOCH) Multi-cell fast fission ionization chamber. 3279800100049 Two U-235 cells, three U-238 cells and one empty cell 3279800100050 were mounted in the detector. The detection 3279800100051 efficiency of the 5 uranium cells was determined as 3279800100052 94%-96%, with relative uncertainties of 0.30%-0.40%. 3279800100053 METHOD (TOF) Flight distance of 76 m. 3279800100054 CORRECTION The corrections for beam nonuniformity, neutron flux 3279800100055 attenuation and for isotope impurity in the uranium 3279800100056 targets. 3279800100057 ERR-ANALYS (ERR-T) The relative experimental uncertainties of 3279800100058 the U-238/U-235 fission cross section ratios are 3279800100059 4.1%-11% in 1-1.4 MeV region while 2.3%-3.6% in 3279800100060 1.4-20 MeV region. The uncertainty mainly comes from 3279800100061 the statistical error of fission events and the 3279800100062 quantification of target nucleus. 3279800100063 (ERR-1) Correction in isotope impurity for U-238 3279800100064 (ERR-2) Correction in isotope impurity for U-235 3279800100065 (ERR-3,,,U) Statistics of fission events for U-238 3279800100066 (ERR-4,,,U) Statistics of fission events for U-235 3279800100067 (ERR-5) Correction in flux attenuation for U-238 3279800100068 (ERR-6) Correction in flux attenuation for U-235 3279800100069 (ERR-7) Correction in beam nonuniformity for U-238 3279800100070 (ERR-8) Correction in beam nonuniformity for U-235 3279800100071 (ERR-9) Detection efficiency for U-238 3279800100072 (ERR-10) Detection efficiency for U-235 3279800100073 (ERR-11) Number of fissile atoms for U-238 3279800100074 (ERR-12) Number of fissile atoms for U-235 3279800100075 STATUS (TABLE) The data of fig.13 of Annals of Nuclear Energy 3279800100076 140(2020)107301 were presented by author. 3279800100077 HISTORY (20200420C) Jimin Wang (CNDC) 3279800100078 (20200614R) The data were received from Rong Liu 3279800100079 (20220901A) Jimin WANG: The detailed uncertainties 3279800100080 obtained from Jie Wen and added in 002 3279800100081 ENDBIB 79 0 3279800100082 COMMON 2 3 3279800100083 ERR-1 ERR-2 3279800100084 PER-CENT PER-CENT 3279800100085 0.0001 0.0001 3279800100086 ENDCOMMON 3 0 3279800100087 ENDSUBENT 86 0 3279800199999 SUBENT 32798002 20220901 32083279800200001 BIB 1 1 3279800200002 REACTION ((92-U-238(N,F),,SIG)/(92-U-235(N,F),,SIG)) 3279800200003 ENDBIB 1 0 3279800200004 NOCOMMON 0 0 3279800200005 DATA 13 85 3279800200006 EN DATA ERR-T ERR-3 ERR-4 ERR-5 3279800200007 ERR-6 ERR-7 ERR-8 ERR-9 ERR-10 ERR-11 3279800200008 ERR-12 3279800200009 MEV NO-DIM PER-CENT PER-CENT PER-CENT PER-CENT 3279800200010 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 3279800200011 PER-CENT 3279800200012 1.008 0.0141 11.15 10.98 1.27 0.053279800200013 0.05 0.12 0.12 0.16 0.15 1.083279800200014 0.98 3279800200015 1.026 0.0135 11.28 11.11 1.26 0.053279800200016 0.05 0.12 0.12 0.16 0.15 1.083279800200017 0.98 3279800200018 1.046 0.0173 10.05 9.85 1.27 0.053279800200019 0.05 0.12 0.12 0.16 0.15 1.083279800200020 0.98 3279800200021 1.066 0.0166 10.24 10.05 1.26 0.053279800200022 0.05 0.12 0.12 0.16 0.15 1.083279800200023 0.98 3279800200024 1.086 0.0222 8.92 8.70 1.27 0.053279800200025 0.05 0.12 0.12 0.16 0.15 1.083279800200026 0.98 3279800200027 1.107 0.0241 8.36 8.14 1.23 0.053279800200028 0.05 0.12 0.12 0.16 0.15 1.083279800200029 0.98 3279800200030 1.129 0.0281 7.87 7.62 1.25 0.053279800200031 0.05 0.12 0.12 0.16 0.15 1.083279800200032 0.98 3279800200033 1.151 0.0350 7.19 6.92 1.26 0.053279800200034 0.05 0.12 0.12 0.16 0.15 1.083279800200035 0.98 3279800200036 1.174 0.0338 7.15 6.88 1.23 0.043279800200037 0.04 0.12 0.12 0.16 0.15 1.083279800200038 0.98 3279800200039 1.198 0.0363 6.94 6.67 1.24 0.043279800200040 0.04 0.12 0.12 0.16 0.15 1.083279800200041 0.98 3279800200042 1.222 0.0368 6.96 6.68 1.25 0.053279800200043 0.05 0.12 0.12 0.16 0.15 1.083279800200044 0.98 3279800200045 1.247 0.0357 6.93 6.65 1.23 0.053279800200046 0.05 0.12 0.12 0.16 0.15 1.083279800200047 0.98 3279800200048 1.273 0.0446 6.33 6.03 1.24 0.053279800200049 0.05 0.12 0.12 0.16 0.15 1.083279800200050 0.98 3279800200051 1.300 0.0574 5.72 5.38 1.26 0.053279800200052 0.05 0.12 0.12 0.16 0.15 1.083279800200053 0.98 3279800200054 1.328 0.0696 5.17 4.79 1.23 0.053279800200055 0.05 0.12 0.12 0.16 0.15 1.083279800200056 0.98 3279800200057 1.356 0.0948 4.60 4.16 1.25 0.053279800200058 0.05 0.12 0.12 0.16 0.15 1.083279800200059 0.98 3279800200060 1.386 0.1319 4.02 3.52 1.25 0.053279800200061 0.05 0.12 0.12 0.16 0.15 1.083279800200062 0.98 3279800200063 1.416 0.1711 3.61 3.05 1.23 0.053279800200064 0.05 0.12 0.12 0.16 0.15 1.083279800200065 0.98 3279800200066 1.448 0.2240 3.33 2.70 1.25 0.053279800200067 0.05 0.12 0.12 0.16 0.15 1.083279800200068 0.98 3279800200069 1.480 0.2733 3.13 2.45 1.25 0.053279800200070 0.05 0.12 0.12 0.16 0.15 1.083279800200071 0.98 3279800200072 1.514 0.2961 3.02 2.32 1.24 0.043279800200073 0.04 0.12 0.12 0.16 0.15 1.083279800200074 0.98 3279800200075 1.549 0.3049 3.01 2.31 1.24 0.043279800200076 0.04 0.12 0.12 0.16 0.15 1.083279800200077 0.98 3279800200078 1.585 0.3124 2.97 2.25 1.23 0.043279800200079 0.04 0.12 0.12 0.16 0.15 1.083279800200080 0.98 3279800200081 1.622 0.3345 2.89 2.15 1.22 0.043279800200082 0.04 0.12 0.12 0.16 0.15 1.083279800200083 0.98 3279800200084 1.660 0.3386 2.90 2.17 1.23 0.053279800200085 0.05 0.12 0.12 0.16 0.15 1.083279800200086 0.98 3279800200087 1.700 0.3465 2.88 2.14 1.23 0.053279800200088 0.05 0.12 0.12 0.16 0.15 1.083279800200089 0.98 3279800200090 1.742 0.3635 2.83 2.07 1.22 0.053279800200091 0.05 0.12 0.12 0.16 0.15 1.083279800200092 0.98 3279800200093 1.785 0.3905 2.79 2.02 1.23 0.053279800200094 0.05 0.12 0.12 0.16 0.15 1.083279800200095 0.98 3279800200096 1.829 0.3986 2.76 1.97 1.22 0.043279800200097 0.04 0.12 0.12 0.16 0.15 1.083279800200098 0.98 3279800200099 1.876 0.4077 2.73 1.94 1.21 0.043279800200100 0.04 0.12 0.12 0.16 0.15 1.083279800200101 0.98 3279800200102 1.924 0.4220 2.77 1.97 1.25 0.043279800200103 0.04 0.12 0.12 0.16 0.15 1.083279800200104 0.98 3279800200105 1.974 0.4154 2.76 1.97 1.24 0.043279800200106 0.04 0.12 0.12 0.16 0.15 1.083279800200107 0.98 3279800200108 2.026 0.4237 2.72 1.92 1.22 0.053279800200109 0.05 0.12 0.12 0.16 0.15 1.083279800200110 0.98 3279800200111 2.080 0.4268 2.71 1.91 1.22 0.053279800200112 0.05 0.12 0.12 0.16 0.15 1.083279800200113 0.98 3279800200114 2.136 0.4541 2.70 1.88 1.24 0.053279800200115 0.05 0.12 0.12 0.16 0.15 1.083279800200116 0.98 3279800200117 2.194 0.4111 2.70 1.91 1.20 0.043279800200118 0.04 0.12 0.12 0.16 0.15 1.083279800200119 0.98 3279800200120 2.255 0.4195 2.70 1.91 1.21 0.033279800200121 0.03 0.12 0.12 0.16 0.15 1.083279800200122 0.98 3279800200123 2.319 0.4325 2.67 1.87 1.20 0.033279800200124 0.03 0.12 0.12 0.16 0.15 1.083279800200125 0.98 3279800200126 2.385 0.4239 2.70 1.90 1.21 0.023279800200127 0.02 0.12 0.12 0.16 0.15 1.083279800200128 0.98 3279800200129 2.454 0.4177 2.71 1.91 1.21 0.043279800200130 0.04 0.12 0.12 0.16 0.15 1.083279800200131 0.98 3279800200132 2.526 0.4362 2.69 1.88 1.21 0.053279800200133 0.05 0.12 0.12 0.16 0.15 1.083279800200134 0.98 3279800200135 2.602 0.4333 2.70 1.90 1.22 0.053279800200136 0.05 0.12 0.12 0.16 0.15 1.083279800200137 0.98 3279800200138 2.681 0.4346 2.69 1.88 1.21 0.053279800200139 0.05 0.12 0.12 0.16 0.15 1.083279800200140 0.98 3279800200141 2.763 0.4344 2.68 1.88 1.21 0.053279800200142 0.05 0.12 0.12 0.16 0.15 1.083279800200143 0.98 3279800200144 2.850 0.4106 2.68 1.89 1.18 0.053279800200145 0.05 0.12 0.12 0.16 0.15 1.083279800200146 0.98 3279800200147 2.940 0.4427 2.67 1.85 1.20 0.053279800200148 0.05 0.12 0.12 0.16 0.15 1.083279800200149 0.98 3279800200150 3.035 0.4469 2.66 1.85 1.21 0.043279800200151 0.04 0.12 0.12 0.16 0.15 1.083279800200152 0.98 3279800200153 3.134 0.4270 2.67 1.87 1.19 0.043279800200154 0.04 0.12 0.12 0.16 0.15 1.083279800200155 0.98 3279800200156 3.239 0.4440 2.67 1.86 1.21 0.043279800200157 0.04 0.12 0.12 0.16 0.15 1.083279800200158 0.98 3279800200159 3.349 0.4704 2.64 1.82 1.22 0.043279800200160 0.04 0.12 0.12 0.16 0.15 1.083279800200161 0.98 3279800200162 3.464 0.4571 2.63 1.80 1.19 0.053279800200163 0.05 0.12 0.12 0.16 0.15 1.083279800200164 0.98 3279800200165 3.586 0.4759 2.61 1.78 1.20 0.053279800200166 0.05 0.12 0.12 0.16 0.15 1.083279800200167 0.98 3279800200168 3.714 0.4756 2.61 1.78 1.20 0.053279800200169 0.05 0.12 0.12 0.16 0.15 1.083279800200170 0.98 3279800200171 3.850 0.4781 2.59 1.75 1.18 0.053279800200172 0.05 0.12 0.12 0.16 0.15 1.083279800200173 0.98 3279800200174 3.992 0.4924 2.59 1.75 1.20 0.053279800200175 0.05 0.12 0.12 0.16 0.15 1.083279800200176 0.98 3279800200177 4.143 0.5002 2.59 1.74 1.20 0.053279800200178 0.05 0.12 0.12 0.16 0.15 1.083279800200179 0.98 3279800200180 4.303 0.4951 2.57 1.73 1.19 0.053279800200181 0.05 0.12 0.12 0.16 0.15 1.083279800200182 0.98 3279800200183 4.472 0.4967 2.58 1.74 1.20 0.043279800200184 0.04 0.12 0.12 0.16 0.15 1.083279800200185 0.98 3279800200186 4.651 0.5238 2.56 1.70 1.20 0.033279800200187 0.03 0.12 0.12 0.16 0.15 1.083279800200188 0.98 3279800200189 4.841 0.5113 2.57 1.71 1.20 0.043279800200190 0.04 0.12 0.12 0.16 0.15 1.083279800200191 0.98 3279800200192 5.043 0.5279 2.58 1.71 1.22 0.043279800200193 0.04 0.12 0.12 0.16 0.15 1.083279800200194 0.98 3279800200195 5.259 0.5334 2.59 1.73 1.23 0.053279800200196 0.05 0.12 0.12 0.16 0.15 1.083279800200197 0.98 3279800200198 5.488 0.5278 2.58 1.72 1.22 0.053279800200199 0.05 0.12 0.12 0.16 0.15 1.083279800200200 0.98 3279800200201 5.733 0.5552 2.62 1.75 1.27 0.043279800200202 0.04 0.12 0.12 0.16 0.15 1.083279800200203 0.98 3279800200204 5.994 0.5509 2.57 1.70 1.23 0.043279800200205 0.03 0.12 0.12 0.16 0.15 1.083279800200206 0.98 3279800200207 6.274 0.5879 2.44 1.55 1.16 0.033279800200208 0.03 0.12 0.12 0.16 0.15 1.083279800200209 0.98 3279800200210 6.574 0.5967 2.34 1.44 1.09 0.023279800200211 0.02 0.12 0.12 0.16 0.15 1.083279800200212 0.98 3279800200213 6.896 0.6110 2.27 1.37 1.04 0.033279800200214 0.03 0.12 0.12 0.16 0.15 1.083279800200215 0.98 3279800200216 7.242 0.5990 2.22 1.32 1.00 0.043279800200217 0.04 0.12 0.12 0.16 0.15 1.083279800200218 0.98 3279800200219 7.616 0.5772 2.21 1.32 0.98 0.043279800200220 0.04 0.12 0.12 0.16 0.15 1.083279800200221 0.98 3279800200222 8.019 0.5902 2.22 1.32 0.99 0.043279800200223 0.04 0.12 0.12 0.16 0.15 1.083279800200224 0.98 3279800200225 8.455 0.5832 2.22 1.32 0.99 0.043279800200226 0.04 0.12 0.12 0.16 0.15 1.083279800200227 0.98 3279800200228 8.928 0.5757 2.25 1.36 1.01 0.043279800200229 0.04 0.12 0.12 0.16 0.15 1.083279800200230 0.98 3279800200231 9.442 0.5903 2.27 1.37 1.03 0.043279800200232 0.04 0.12 0.12 0.16 0.15 1.083279800200233 0.98 3279800200234 10.002 0.5707 2.29 1.40 1.03 0.043279800200235 0.04 0.12 0.12 0.16 0.15 1.083279800200236 0.98 3279800200237 10.613 0.5774 2.33 1.44 1.07 0.043279800200238 0.04 0.12 0.12 0.16 0.15 1.083279800200239 0.98 3279800200240 11.283 0.5840 2.35 1.46 1.09 0.043279800200241 0.04 0.12 0.12 0.16 0.15 1.083279800200242 0.98 3279800200243 12.019 0.5786 2.37 1.48 1.10 0.043279800200244 0.04 0.12 0.12 0.16 0.15 1.083279800200245 0.98 3279800200246 12.829 0.5569 2.39 1.52 1.10 0.043279800200247 0.04 0.12 0.12 0.16 0.15 1.083279800200248 0.98 3279800200249 13.725 0.5690 2.37 1.48 1.09 0.043279800200250 0.04 0.12 0.12 0.16 0.15 1.083279800200251 0.98 3279800200252 14.719 0.5754 2.33 1.44 1.07 0.043279800200253 0.04 0.12 0.12 0.16 0.15 1.083279800200254 0.98 3279800200255 15.827 0.6087 2.31 1.41 1.07 0.043279800200256 0.04 0.12 0.12 0.16 0.15 1.083279800200257 0.98 3279800200258 17.065 0.6031 2.32 1.42 1.08 0.043279800200259 0.04 0.12 0.12 0.16 0.15 1.083279800200260 0.98 3279800200261 18.456 0.6446 2.35 1.43 1.12 0.043279800200262 0.04 0.12 0.12 0.16 0.15 1.083279800200263 0.98 3279800200264 20.026 0.7286 2.33 1.37 1.14 0.063279800200265 0.06 0.12 0.12 0.16 0.15 1.083279800200266 0.98 3279800200267 ENDDATA 261 0 3279800200268 ENDSUBENT 267 0 3279800299999 ENDENTRY 2 0 3279899999999