ENTRY 32811 20220407 32083281100000001 SUBENT 32811001 20220407 32083281100100001 BIB 12 68 3281100100002 TITLE Measurement of the U-236(n,f) cross section for 3281100100003 neutron energies from 0.4 MeV to 40 MeV from the 3281100100004 back-streaming white neutron beam at the China 3281100100005 Spallation Neutron Source 3281100100006 AUTHOR (Zhizhou Ren,Yiwei Yang,Jie Wen,Hairui Guo, 3281100100007 Zhongwei Wen,Rong Liu,Zijie Han,Weili Sun,Xingyan Liu, 3281100100008 Qiping Chen,Tao Ye,Qi An,Huaiyong Bai,Jie Bao, 3281100100009 Ping Cao,Yonghao Chen,Pinjing Cheng,Zengqi Cui, 3281100100010 Ruirui Fan,Changqing Feng,Minhao Gu,Fengqin Guo, 3281100100011 Changcai Han,Guozhu He,Yongcheng He,Yuefeng He, 3281100100012 Hanxiong Huang,Weiling Huang,Xiru Huang,Xiaolu Ji, 3281100100013 Xuyang Ji,Haoyu Jiang,Wei Jiang,Hantao Jing,Ling Kang, 3281100100014 Mingtao Kang,Bo Li,Lun Li,Qiang Li,Xiao Li,Yang Li(a), 3281100100015 Yang Li(b),Shubin Liu,Guangyuan Luan,Yinglin Ma, 3281100100016 Changjun Ning,Binbin Qi,Jie Ren,Xichao Ruan, 3281100100017 Zhaohui Song,Hong Sun,Xiaoyang Sun,Zhijia Sun, 3281100100018 Zhixin Tan,Hongqing Tang,Jingyu Tang,Pengcheng Wang, 3281100100019 Qi Wang,Taofeng Wang,Yanfeng Wang,Zhaohui Wang, 3281100100020 Zheng Wang,Qingbiao Wu,Xiaoguang Wu,Xuan Wu,Likun Xie, 3281100100021 Han Yi,Li Yu,Tao Yu,Yongji Yu,Guohui Zhang,Jing Zhang, 3281100100022 Linhao Zhang,Liying Zhang,Qingmin Zhang,Qiwei Zhang, 3281100100023 Xianpeng Zhang,Yuliang Zhang,Zhiyong Zhang, 3281100100024 Yingtan Zhao,Liang Zhou,Zuying Zhou,Danyang Zhu, 3281100100025 Kejun Zhu,Peng Zhu) 3281100100026 INSTITUTE (3CPRNPC,3CPRIPM,3CPRHST,3CPRBJG,3CPRAEP,3CPRIHP, 3281100100027 3CPRNIX,3CPRBHN) 3281100100028 (3CPRCPR) University of South China, Hengyang 3281100100029 (3CPRCPR) Xi'an Jiaotong University, Xi'an 3281100100030 REFERENCE (J,PR/C,102,034604,2020) 3281100100031 #doi:10.1103/PhysRevC.102.034604 3281100100032 FACILITY (SYNCH,3CPRIHP) The Back-n white neutron source at 3281100100033 China Spallation Neutron Source (CSNS) 3281100100034 INC-SOURCE (SPALL) The neutrons were generated using the proton 3281100100035 beam (25 Hz, 1.6 GeV) to bombard a tungsten target. 3281100100036 Proton bunches power will be increased from 10-100 kW 3281100100037 in the first phase of CSNS. With the thick tungsten 3281100100038 target and the water serving as coolant through it, 3281100100039 the neutron beam at 80 m from the target is in the 3281100100040 order of 5.76E6 n/cm2/s at 100 kW. 3281100100041 SAMPLE Three uranium isotope samples are used in this 3281100100042 measurement. The uranium fission materials were 3281100100043 electroplated on the backings of stainless steel in 3281100100044 the form of U3O8. The diameter of the deposit is 3281100100045 about 50 mm. 3281100100046 The U-236 sample was enriched to 99.944%, with a 3281100100047 weight of 2.2103 mg, a diameter of 4.969 cm and a 3281100100048 thickness of 0.114 mg/cm2. 3281100100049 The two U-235 samples were enriched to 99.985%, with 3281100100050 a weight of 5.1729 mg and 5.7067 mg, a diameter of 3281100100051 4.974 cm and 4.976 cm, a thickness of 0.266 mg/cm2 3281100100052 and 0.293 mg/cm2, respectively. 3281100100053 DETECTOR (IOCH) The multicell fast fission ionization chamber 3281100100054 has been designed for the fission cross-section 3281100100055 measurement. The 300 mm x 300 mm cylindrical shell of 3281100100056 the ionization chamber was made of stainless steel 5 3281100100057 mm thick and the 80 mm diameter window sealed with a 3281100100058 Kapton film 100 um thick is located in the center of 3281100100059 one of the chamber caps. The chamber is filled with a 3281100100060 gas mixture of 90% Ar and 10% CH4 at a pressure of 3281100100061 800 mbar. 3281100100062 METHOD (TOF) Flight distance of 76 m. 3281100100063 CORRECTION The correction for for background events, beam 3281100100064 nonuniformity, and sample mass. 3281100100065 STATUS (TABLE) The data of Fig.11 and Fig.13 of Phys.Rev.C 3281100100066 102,034604,2020 were presented by author. 3281100100067 HISTORY (20220112R) The data received from Zhizhou Ren 3281100100068 (20220407C) Panjiao Shen (Univ. of South China) and 3281100100069 Lile Liu (CNDC) 3281100100070 ENDBIB 68 0 3281100100071 NOCOMMON 0 0 3281100100072 ENDSUBENT 71 0 3281100199999 SUBENT 32811002 20220407 32083281100200001 BIB 4 20 3281100200002 REACTION 1((92-U-236(N,F),,SIG)/(92-U-235(N,F),,SIG)) 3281100200003 2(92-U-236(N,F),,SIG) 3281100200004 MONITOR 2(92-U-235(N,F),,SIG) 3281100200005 MONIT-REF 2(,,3,ENDF/B-VIII.0,,2018) 3281100200006 ERR-ANALYS (ERR-T) The total experimental uncertainty 3281100200007 (ERR-S) The statistical uncertainty including the 3281100200008 background-subtracted fission events for 3281100200009 U-235 (0.3-0.8%) 3281100200010 U-236 (2.2-11.1% below 1.0 MeV, 0.8-2.2% above 3281100200011 1.0 MeV) 3281100200012 (ERR-1) The number of fission atoms in the U-235 sample3281100200013 (ERR-2) The number of fission atoms in the U-236 sample3281100200014 (ERR-3) The detection efficiency for U-235 3281100200015 (ERR-4) The detection efficiency for U-236 3281100200016 (ERR-5) The nonuniformity of U-235 sample and white 3281100200017 neutron beam 3281100200018 (ERR-6) The nonuniformity of U-236 sample and white 3281100200019 neutron beam 3281100200020 (ERR-7) The impurity of the U-235 sample 3281100200021 (ERR-8) The impurity of the U-236 sample 3281100200022 ENDBIB 20 0 3281100200023 COMMON 8 6 3281100200024 ERR-1 ERR-2 ERR-3 ERR-4 ERR-5 ERR-6 3281100200025 ERR-7 ERR-8 3281100200026 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 3281100200027 PER-CENT PER-CENT 3281100200028 1.00 0.98 0.47 0.26 0.09 0.153281100200029 0.01 0.02 3281100200030 ENDCOMMON 6 0 3281100200031 DATA 6 77 3281100200032 EN DATA 1ERR-T 1DATA 2ERR-T 2ERR-S 3281100200033 MEV NO-DIM PER-CENT B PER-CENT PER-CENT 3281100200034 0.450 0.0031 11.2 0.0036 11.3 11.13281100200035 0.566 0.0071 7.0 0.0081 7.1 6.93281100200036 0.646 0.0156 10.0 0.0174 10.0 9.93281100200037 0.676 0.0220 8.4 0.0246 8.5 8.33281100200038 0.708 0.0373 6.5 0.0418 6.5 6.33281100200039 0.742 0.0592 5.2 0.0669 5.3 4.93281100200040 0.776 0.0849 4.5 0.0952 4.6 4.23281100200041 0.813 0.1098 4.1 0.1222 4.2 3.83281100200042 0.851 0.1592 3.5 0.1784 3.6 3.13281100200043 0.891 0.1847 3.3 0.2104 3.4 2.83281100200044 0.934 0.2559 2.9 0.2989 3.0 2.43281100200045 0.978 0.3089 2.7 0.3723 2.9 2.23281100200046 1.024 0.3018 2.7 0.3625 2.9 2.23281100200047 1.072 0.3044 2.7 0.3642 2.9 2.23281100200048 1.122 0.3684 2.6 0.4409 2.8 2.03281100200049 1.175 0.4478 2.5 0.5386 2.6 1.93281100200050 1.231 0.5004 2.4 0.6051 2.6 1.83281100200051 1.289 0.5539 2.3 0.6736 2.5 1.73281100200052 1.349 0.5920 2.3 0.7241 2.5 1.73281100200053 1.413 0.5704 2.4 0.7019 2.6 1.73281100200054 1.480 0.5761 2.4 0.7135 2.6 1.73281100200055 1.549 0.5447 2.4 0.6793 2.6 1.83281100200056 1.622 0.5423 2.4 0.6813 2.6 1.83281100200057 1.699 0.5748 2.4 0.7262 2.6 1.83281100200058 1.779 0.5969 2.4 0.7580 2.6 1.83281100200059 1.863 0.6279 2.4 0.8018 2.6 1.73281100200060 1.950 0.6087 2.4 0.7818 2.6 1.83281100200061 2.042 0.6327 2.4 0.8139 2.6 1.83281100200062 2.139 0.6539 2.4 0.8381 2.6 1.73281100200063 2.239 0.6544 2.4 0.8353 2.6 1.73281100200064 2.345 0.6845 2.4 0.8697 2.6 1.73281100200065 2.455 0.6902 2.4 0.8723 2.6 1.73281100200066 2.571 0.6660 2.4 0.8375 2.6 1.83281100200067 2.692 0.6781 2.4 0.8469 2.6 1.83281100200068 2.819 0.7031 2.4 0.8700 2.6 1.83281100200069 2.952 0.6865 2.5 0.8397 2.6 1.83281100200070 3.091 0.7089 2.4 0.8570 2.6 1.83281100200071 3.237 0.7208 2.4 0.8626 2.6 1.83281100200072 3.389 0.7337 2.5 0.8687 2.7 1.83281100200073 3.549 0.7331 2.5 0.8582 2.7 1.83281100200074 3.716 0.7575 2.5 0.8766 2.7 1.83281100200075 3.891 0.7539 2.5 0.8634 2.7 1.83281100200076 4.075 0.7955 2.5 0.9022 2.7 1.83281100200077 4.267 0.7957 2.5 0.8964 2.7 1.83281100200078 4.468 0.7714 2.5 0.8630 2.7 1.93281100200079 4.679 0.7507 2.6 0.8273 2.7 1.93281100200080 4.899 0.7906 2.5 0.8559 2.7 1.93281100200081 5.130 0.7878 2.6 0.8400 2.8 2.03281100200082 5.372 0.7773 2.7 0.8165 2.8 2.03281100200083 5.625 0.7773 2.7 0.8071 2.8 2.03281100200084 5.890 0.8418 2.7 0.8945 2.9 2.03281100200085 6.168 0.8881 2.6 1.0349 2.8 1.93281100200086 6.458 0.8490 2.5 1.1141 2.7 1.93281100200087 6.763 0.8864 2.4 1.2798 2.6 1.83281100200088 7.081 0.8877 2.4 1.3929 2.6 1.73281100200089 7.415 0.9226 2.3 1.5450 2.5 1.63281100200090 7.765 0.8903 2.3 1.5500 2.5 1.63281100200091 8.130 0.8805 2.4 1.5736 2.6 1.73281100200092 8.514 0.8457 2.4 1.5158 2.6 1.73281100200093 8.915 0.8684 2.5 1.5484 2.6 1.83281100200094 9.335 0.8579 2.5 1.5213 2.7 1.83281100200095 9.560 0.8607 2.1 1.5218 2.3 1.33281100200096 10.482 0.8522 2.1 1.4889 2.3 1.43281100200097 11.494 0.8312 2.2 1.4165 2.4 1.53281100200098 12.603 0.8142 2.3 1.4823 2.5 1.53281100200099 13.818 0.7860 2.3 1.6065 2.5 1.63281100200100 15.152 0.7724 2.3 1.6457 2.5 1.63281100200101 16.613 0.8087 2.3 1.7142 2.5 1.63281100200102 18.216 0.8533 2.3 1.7521 2.5 1.73281100200103 19.974 0.8753 2.4 1.7698 2.6 1.73281100200104 21.901 0.9102 2.4 1.9236 2.6 1.73281100200105 24.014 0.8932 2.4 1.8665 2.6 1.83281100200106 26.331 0.9126 2.5 1.9362 2.7 1.83281100200107 28.871 0.9269 2.5 1.9550 2.7 1.83281100200108 31.656 0.9222 2.6 1.8928 2.8 1.93281100200109 34.710 0.9184 2.6 1.8574 2.8 2.03281100200110 38.059 0.9629 2.6 1.9135 2.8 2.03281100200111 ENDDATA 79 0 3281100200112 ENDSUBENT 111 0 3281100299999 ENDENTRY 2 0 3281199999999