Improved measurement of the neutron flux of CSNS Back-n ES#2 in low energy region from 0.3 eV to 150 keV

Yijia Qiu , Yonghao Chen , Qiang Li , Jincheng Wang , Jie Ren , Shengda Tang , Ruirui Fan , Han Yi , Jingyu Tang , Changjun Ning , Wei Jiang , Yang Li , Hantao Jing , Zhixin Tan
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Abstract

The Back-streaming neutron beamline (Back-n) at China Spallation Neutron Source (CSNS) is a newly built time-of-flight facility providing white neutrons from 0.3 eV to 300 MeV. The neutron flux of Back-n is of crucial importance for the feasibility studies of planned measurements and data analysis of conducted experiments. The initial neutron flux measurement of Back-n End Station 2 (ES#2) was conducted by a fission chamber. The measured flux was found to lack accuracy below 150 keV because the fission cross-section of 235U in this region is not a neutron cross-section standard. In this paper, we report an improved measurement of the energy-dependent neutron flux at ES#2 in low energy region based on 6Li(n,t) reaction. The neutron flux was measured by a 6Li-Si monitor from 0.3 eV to 150 keV, achieving an accuracy of 3.4%–6.7%. The flux shapes of ES#1 and ES#2 with the same beam configuration were compared as well. It was found that the difference in shape is energy-dependent and the maximum difference can reach up to approximately 20%, even though they were on the same beamline and used same beam configuration.
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改进 CSNS Back-n ES#2 在 0.3 eV 至 150 keV 低能区的中子通量测量方法
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来源期刊
CiteScore
3.20
自引率
21.40%
发文量
787
审稿时长
1 months
期刊介绍: Section A of Nuclear Instruments and Methods in Physics Research publishes papers on design, manufacturing and performance of scientific instruments with an emphasis on large scale facilities. This includes the development of particle accelerators, ion sources, beam transport systems and target arrangements as well as the use of secondary phenomena such as synchrotron radiation and free electron lasers. It also includes all types of instrumentation for the detection and spectrometry of radiations from high energy processes and nuclear decays, as well as instrumentation for experiments at nuclear reactors. Specialized electronics for nuclear and other types of spectrometry as well as computerization of measurements and control systems in this area also find their place in the A section. Theoretical as well as experimental papers are accepted.
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