ENTRY 32889 20230609 3288900000001 SUBENT 32889001 20230609 20240316 3288900100001 BIB 13 76 3288900100002 TITLE Measurement of the 232Th(n,f) cross section from 3288900100003 1 MeV to 200 MeV at CSNS Back-n 3288900100004 AUTHOR (Zhizhou Ren, Yiwei Yang, Yonghao Chen, Rong Liu, 3288900100005 Bangjiao Ye, Jie Wen, Hairui Guo, Zijie Han, 3288900100006 Qiping Chen, Zhongwei Wen, Weili Sun, Han Yi, 3288900100007 Xingyan Liu, Tao Ye, Jiangbo Bai, Qi An, Jie Bao, 3288900100008 Yu Bao, Ping Cao, Haolei Chen, Zhen Chen, Zengqi Cui, 3288900100009 Ruirui Fan, Changqing Feng, Keqing Gao, Xiaolong Gao, 3288900100010 Minhao Gu, Changcai Han, Guozhu He, Yongcheng He, 3288900100011 Yang Hong, Yiwei Hu, Hanxiong Huang, Xiru Huang, 3288900100012 Haoyu Jiang, Wei Jiang, Zhijie Jiang, Hantao Jing, 3288900100013 Ling Kang, Bo Li, Chao Li, Jiawen Li, Qiang Li, 3288900100014 Xiao Li, Yang Li, Jie Liu, Shubin Liu, Ze Long, 3288900100015 Guangyuan Luan, Changjun Ning, Mengchen Niu, 3288900100016 Binbin Qi, Jie Ren, Xichao Ruan, Zhaohui Song, 3288900100017 Kang Sun, Zhijia Sun, Zhixin Tan, Jingyu Tang, 3288900100018 Xinyi Tang, Binbin Tian, Lijiao Wang, Pengcheng Wang, 3288900100019 Zhaohui Wang, Xiaoguang Wu, Xuan Wu, Likun Xie, 3288900100020 Xiaoyun Yang, Li Yu, Tao Yu, Yongji Yu, Guohui Zhang, 3288900100021 Linhao Zhang, Qiwei Zhang, Xianpeng Zhang, 3288900100022 Yuliang Zhang, Zhiyong Zhang, Luping Zhou, 3288900100023 Zhihao Zhou, Kejun Zhu) 3288900100024 INSTITUTE (3CPRHST,3CPRNPC,3CPRIHP,3CPRIPM,3CPRAEP,3CPRBJG, 3288900100025 3CPRNIX,3CPRUCA) 3288900100026 REFERENCE (J,CNST,34,115,2023) 3288900100027 #doi:10.1007/s41365-023-01271-7 3288900100028 FACILITY (SYNCH,3CPRIHP) The Back-n white neutron source at 3288900100029 China Spallation Neutron Source (CSNS) 3288900100030 INC-SOURCE (SPALL) Bombarding 1.6 GeV protons to a tungsten 3288900100031 target with 25 Hz frequency and 40 kW power. The 3288900100032 neutron beam spot at endstation 2 of the Back-n was 3288900100033 60 mm diameter, the FWHM of each neutron bunch was 3288900100034 about 60 ns, the neutron beam was about 2.81E6 n/cm2/s.3288900100035 SAMPLE Three 232Th (0.177 mg/cm2, 0.163 mg/cm2, 0.172 mg/cm2) 3288900100036 and two 235U (0.266 mg/cm2, 0.293 mg/cm2) high purity 3288900100037 fission samples were electroplated on the backings of 3288900100038 aluminum steel or stainless in the form of U3O8 and 3288900100039 ThO2. 3288900100040 DETECTOR (IOCH) A multi-cell fast ionization chamber (FIXM) 3288900100041 was used for measuring the fission events. 3288900100042 The detection efficiencies of the two 235U and the 3288900100043 three 232Th fission cells are 94.90%, 94.65%, 95.94%, 3288900100044 95.68% and 96.00%, respectively. 3288900100045 METHOD (TOF) 3288900100046 INC-SPECT (EN-RSL-HW) Half width of the energy bin centred at 3288900100047 the incident energy coded under EN 3288900100048 CORRECTION The neutron flux attenuation, the nonuniformity and 3288900100049 impurities of samples. 3288900100050 ERR-ANALYS (ERR-T) Total uncertainty 3288900100051 (ERR-S) Statistical uncertainty 3288900100052 (ERR-1,0.6,0.8) Fission events measured by MFIC, 3288900100053 235U, 1-20 MeV (0.6-0.8%)3288900100054 (ERR-2,0.7,2.6) Fission events measured by MFIC, 3288900100055 235U, 20-210 MeV (0.7-2.6%)3288900100056 (ERR-3,3.1,33.3) Fission events measured by MFIC, 3288900100057 232Th, 1-2 MeV (3.1-33.3%)3288900100058 (ERR-4,1.6,3.1) Fission events measured by MFIC, 3288900100059 232Th, 2-20 MeV (1.6-3.1%)3288900100060 (ERR-5,1.4,4.6) Fission events measured by MFIC, 3288900100061 232Th, 20-210 MeV (1.4-4.6%)3288900100062 (ERR-6,0.9,1.0) Atom number of 235U (0.9-1.0%)3288900100063 (ERR-7,1.2,1.3) Atom number of 232Th (1.2-1.3%)3288900100064 (ERR-8,0.2,2.0) Neutron flux attenuation 235U 3288900100065 (0.2-2.0%)3288900100066 (ERR-9,0.2,2.0) Neutron flux attenuation 232Th 3288900100067 (0.2-2.0%)3288900100068 (ERR-10,0.2,0.3) Detection efficiency of 235U 3288900100069 (0.2-0.3%)3288900100070 (ERR-11,0.2,0.4) Detection efficiency of 232Th 3288900100071 (0.2-0.4%)3288900100072 (ERR-12) Nonuniformity 235U (0.1%)3288900100073 (ERR-13) Nonuniformity 232Th (0.1%)3288900100074 (ERR-14,,0.01) Sample contamination corrections of 3288900100075 235U (<0.01%)3288900100076 HISTORY (20230609R) Data received from Zhizhou Ren 3288900100077 (20230609C) Jimin Wang (CNDC) 3288900100078 ENDBIB 76 0 3288900100079 COMMON 2 3 3288900100080 ERR-12 ERR-13 3288900100081 PER-CENT PER-CENT 3288900100082 0.1 0.1 3288900100083 ENDCOMMON 3 0 3288900100084 ENDSUBENT 83 0 3288900199999 SUBENT 32889002 20230609 20240316 3288900200001 BIB 4 6 3288900200002 REACTION 1((90-TH-232(N,F),,SIG)/(92-U-235(N,F),,SIG)) 3288900200003 2(90-TH-232(N,F),,SIG) 3288900200004 MONITOR 2(92-U-235(N,F),,SIG) 3288900200005 MONIT-REF 2(,A.D.Carlson+,J,NDS,148,143,2018) 3288900200006 STATUS (TABLE) Figs.8, 9, 10 and 11 of , 3288900200007 the data were presented by author 3288900200008 ENDBIB 6 0 3288900200009 NOCOMMON 0 0 3288900200010 DATA 6 86 3288900200011 EN DATA 1ERR-S 1ERR-T 1DATA 2ERR-T 23288900200012 MEV NO-DIM PER-CENT PER-CENT B PER-CENT 3288900200013 1.008 0.0009 33.3 33.4 0.0011 33.4 3288900200014 1.030 0.0017 25.0 25.1 0.0020 25.1 3288900200015 1.053 0.0015 25.8 25.9 0.0018 25.9 3288900200016 1.077 0.0022 21.3 21.4 0.0026 21.4 3288900200017 1.101 0.0026 19.6 19.7 0.0031 19.7 3288900200018 1.127 0.0020 22.4 22.4 0.0024 22.5 3288900200019 1.153 0.0032 17.7 17.8 0.0038 17.8 3288900200020 1.180 0.0032 18.0 18.0 0.0037 18.1 3288900200021 1.208 0.0039 16.0 16.1 0.0046 16.2 3288900200022 1.237 0.0066 12.2 12.3 0.0078 12.4 3288900200023 1.268 0.0102 9.9 10.0 0.0121 10.1 3288900200024 1.299 0.0173 7.6 7.8 0.0206 7.9 3288900200025 1.331 0.0284 6.0 6.2 0.0339 6.4 3288900200026 1.365 0.0431 4.9 5.1 0.0516 5.3 3288900200027 1.400 0.0491 4.6 4.9 0.0590 5.0 3288900200028 1.437 0.0529 4.4 4.7 0.0638 4.9 3288900200029 1.475 0.0604 4.1 4.4 0.0732 4.6 3288900200030 1.514 0.0688 3.8 4.1 0.0837 4.3 3288900200031 1.555 0.0880 3.4 3.8 0.1075 4.0 3288900200032 1.598 0.1028 3.2 3.6 0.1260 3.8 3288900200033 1.642 0.0816 3.5 3.9 0.1005 4.1 3288900200034 1.689 0.0729 3.7 4.1 0.0900 4.3 3288900200035 1.737 0.0720 3.7 4.0 0.0893 4.2 3288900200036 1.788 0.0640 4.0 4.3 0.0796 4.5 3288900200037 1.840 0.0853 3.4 3.8 0.1065 4.0 3288900200038 1.895 0.0946 3.3 3.6 0.1185 3.9 3288900200039 1.953 0.1024 3.2 3.5 0.1287 3.8 3288900200040 2.013 0.0986 3.2 3.6 0.1242 3.8 3288900200041 2.077 0.0980 3.2 3.6 0.1232 3.8 3288900200042 2.143 0.1083 3.1 3.5 0.1358 3.7 3288900200043 2.212 0.1052 3.1 3.5 0.1316 3.7 3288900200044 2.285 0.0981 3.2 3.5 0.1222 3.8 3288900200045 2.361 0.0914 3.3 3.6 0.1134 3.8 3288900200046 2.442 0.0978 3.2 3.6 0.1208 3.8 3288900200047 2.526 0.0960 3.3 3.6 0.1182 3.9 3288900200048 2.615 0.1029 3.1 3.6 0.1263 3.8 3288900200049 2.709 0.1033 3.1 3.5 0.1260 3.7 3288900200050 2.808 0.1106 3.0 3.4 0.1340 3.7 3288900200051 2.913 0.1127 3.0 3.4 0.1353 3.6 3288900200052 3.023 0.1138 3.0 3.4 0.1351 3.6 3288900200053 3.140 0.1182 2.9 3.3 0.1393 3.6 3288900200054 3.264 0.1175 2.9 3.3 0.1372 3.6 3288900200055 3.395 0.1264 2.8 3.3 0.1461 3.6 3288900200056 3.534 0.1213 2.8 3.3 0.1388 3.6 3288900200057 3.682 0.1263 2.8 3.3 0.1432 3.6 3288900200058 3.840 0.1262 2.8 3.3 0.1416 3.6 3288900200059 4.008 0.1336 2.7 3.3 0.1485 3.5 3288900200060 4.188 0.1275 2.8 3.3 0.1408 3.6 3288900200061 4.379 0.1350 2.7 3.3 0.1481 3.5 3288900200062 4.585 0.1371 2.7 3.2 0.1489 3.4 3288900200063 4.805 0.1366 2.7 3.2 0.1458 3.4 3288900200064 5.041 0.1316 2.8 3.3 0.1378 3.6 3288900200065 5.295 0.1484 2.7 3.3 0.1534 3.5 3288900200066 5.569 0.1395 2.8 3.4 0.1417 3.6 3288900200067 5.865 0.1463 2.7 3.2 0.1511 3.5 3288900200068 6.186 0.1669 2.4 3.0 0.1914 3.3 3288900200069 6.533 0.2202 2.0 2.6 0.2901 3.0 3288900200070 6.911 0.2593 1.7 2.5 0.3818 2.9 3288900200071 7.322 0.2483 1.7 2.5 0.3992 2.9 3288900200072 7.771 0.2319 1.8 2.6 0.3950 2.9 3288900200073 8.264 0.2053 1.9 2.7 0.3592 3.0 3288900200074 8.805 0.2002 1.9 2.7 0.3493 3.1 3288900200075 9.401 0.1929 2.0 2.8 0.3340 3.2 3288900200076 10.060 0.1827 2.1 2.9 0.3139 3.2 3288900200077 10.792 0.1830 2.1 3.0 0.3114 3.3 3288900200078 11.606 0.1808 2.2 3.2 0.3019 3.5 3288900200079 12.518 0.1640 2.3 3.3 0.2897 3.6 3288900200080 13.542 0.1752 2.2 3.3 0.3410 3.6 3288900200081 14.698 0.1854 2.1 3.4 0.3815 3.6 3288900200082 16.010 0.2163 2.0 3.5 0.4554 3.7 3288900200083 17.508 0.2321 1.9 3.5 0.4716 3.8 3288900200084 19.229 0.2660 1.9 3.7 0.5278 4.0 3288900200085 21.221 0.3054 1.8 3.7 0.6252 4.0 3288900200086 23.543 0.3454 1.7 3.6 0.7141 4.0 3288900200087 26.274 0.3402 1.7 3.6 0.7060 4.1 3288900200088 29.518 0.3607 1.7 3.6 0.7515 4.0 3288900200089 33.416 0.3969 1.6 3.6 0.8243 4.2 3288900200090 38.158 0.4310 1.6 3.6 0.8346 4.4 3288900200091 44.016 0.4811 1.5 3.6 0.9243 4.3 3288900200092 51.379 0.4918 1.5 3.6 0.9155 4.6 3288900200093 60.832 0.5219 1.5 3.6 0.9424 4.4 3288900200094 73.286 0.5359 1.6 3.6 0.9082 4.5 3288900200095 90.237 0.5660 1.7 3.7 0.8920 5.2 3288900200096 114.315 0.5632 2.1 3.8 0.8396 6.0 3288900200097 150.588 0.5672 2.9 4.4 0.8110 6.1 3288900200098 210.273 0.5620 5.3 6.2 0.8003 7.7 3288900200099 ENDDATA 88 0 3288900200100 ENDSUBENT 99 0 3288900299999 ENDENTRY 2 0 3288999999999