New measurement of the neutron-induced total cross-sections of natCr in a wide energy range on the Back-n at CSNS

Baoqian Li, Min Xiao, Yonghao Chen, Jie-Ming Xue, Xinxiang Li, Han Yi, Pin-Jing Cheng, Rong Liu, Yiwei Yang, Z. Han, Da-Jun Zhao, Haoqiang Wang, Jirong Zhao, Peng Luan, Jing Liu, Zijun Liu, Chaomin Chen, Wen Luo, Bo Zheng, Song Feng
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Abstract

The neutron total cross-section of natCr plays a crucial role in new nuclear engineer design and fundamental science. A new measurement of neutron-induced total cross-sections of natCr has been performed using the transmission method on the back-streaming white neutron beamline (Back-n) at the China Spallation Neutron Source (CSNS). Neutron energy was determined using the time-of-flight technique. The neutron total cross-sections of natCr have been obtained across an exceptionally broad energy range (0.3 eV-20 MeV) with one experiment for the first time. The resulting effective total cross-sections has been compared with the existing experimental data in different energy ranges, and a good agreement with the evaluated libraries has been found. Theoretical calculation of the total cross-section in the energy range of 1.5 MeV to 20 MeV has been conducted using the TALYS-1.96 and compared with the present results. The measurement provides a high-quality total cross-section of natCr including detailed uncertainty data across a wide energy range, offering a valuable reference for nuclear data re-evaluating and nuclear engineering design.
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在 CSNS 的 Back-n 上对 natCr 在宽能量范围内的中子诱导总截面进行的新测量
natCr 的中子总截面在新型核工程设计和基础科学中起着至关重要的作用。在中国溅射中子源(CSNS)的后流白中子束线(Back-n)上,利用透射法对中子诱导的 natCr 总截面进行了新的测量。中子能量采用飞行时间技术测定。通过一次实验首次获得了 natCr 在极宽能量范围(0.3 eV-20 MeV)内的中子总横截面。所得到的有效总截面与不同能量范围内的现有实验数据进行了比较,发现与评估库的数据非常吻合。使用 TALYS-1.96 对 1.5 MeV 至 20 MeV 能量范围内的总截面进行了理论计算,并与本结果进行了比较。这次测量提供了 natCr 的高质量总截面,包括宽能量范围内的详细不确定性数据,为核数据再评估和核工程设计提供了宝贵的参考。
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