Ruirui Fan^5,6, Hongwei Wang^10,9, Wenqing Shen^10,9, Jingyi Zhang¹¹, Ruoran Bai¹², Shaokun Liu¹³, Yubing Li^1,14, Cheng Li¹⁴, Chenchen Guo¹⁵, Hao Liang^1,15, Junheng Hu^1,15, Ting Liu^1,15, Yi Sui^1,16, Xiankai Li¹⁶, Xinxiang Li¹⁶, Wen Luo¹⁶, Yaju Chen¹⁶, Wen Xie¹⁶, Zhouji Liao¹⁶, Xinrong Hu¹⁷, Chunwang Ma^18,19, Han Yi^5,6, Yonghao Chen^5,6, Qiang Li^5,6, Zhixin Tan^5,6, and Hantao Jing^5,6 (The CSNS Back-n Collaboration)

• ¹Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
• ²College of Physical Science and Technology, Shenyang Normal University, Shenyang 110034, China
• ³Key Laboratory of Nuclear Physics and Ion-beam Application (MOE), Department of Nuclear Science and Technology, Institute of Modern Physics, Fudan University, Shanghai 200433, China
• ⁴Shanghai Research Center for Theoretical Nuclear Physics, NSFC and Fudan University, Shanghai 200438, China
• ⁵Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
• ⁶Spallation Neutron Source Science Center, Dongguan 523803, China
• ⁷Key Laboratory of Nuclear Data, China Institute of Atomic Energy, Beijing 102413, China
• ⁸School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230027, China
• ⁹Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
• ¹⁰Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
• ¹¹Department of Astronomy, Tsinghua University, Beijing 100084, China
• ¹²School of Physics, Sun Yat-sen University, Guangzhou 510275, China
• ¹³School of Physics and Astronomy, Sun Yat-sen University, Zhuhai 519082, China
• ¹⁴Guangxi Key Laboratory of Nuclear Physics and Technology, College of Physics and Technology, Guangxi Normal University, Guilin 541004, China
• ¹⁵Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, China
• ¹⁶School of Nuclear Science and Technology, University of South China, Hengyang 421001, China
• ¹⁷Chengdu University of Technology, Chengdu 610059, China
• ¹⁸Institute of Nuclear Science and Technology, Henan Academy of Sciences, Zhengzhou 450046, China
• ¹⁹College of Physics, Centre for Theoretical Physics, Henan Normal University, Xinxiang 453007, China

• ^*Contact author: anzhendong@impcas.ac.cn
• ^†Contact author: liliu2020@synu.edu.cn
• ^‡Contact author: renjie@ciae.ac.cn