Measurement of the neutron flux of CSNS Back-n ES#1 under small collimators from 0.5 eV to 300 MeV. - Chen, Yonghao; Qiu, Yijia; Li, Qiang; Tang, Shengda; Yang, Yiwei; Ren, Zhizhou; Jiang, Wei; Fan, Ruirui; Yi, Han; Liu, Rong; Tang, Jingyu; Jing, Hantao; et al. (European Physical Journal A -- Hadrons & Nuclei, 2024)